lw2.lisp

   1 (uiop:define-package #:lw2-viewer
   2   (:use #:cl #:sb-thread #:flexi-streams #:djula #:iterate
   3         #:lw2-viewer.config #:lw2.utils #:lw2.lmdb #:lw2.backend #:lw2.links #:lw2.clean-html #:lw2.login #:lw2.context #:lw2.sites #:lw2.components #:lw2.html-reader #:lw2.fonts
   4         #:lw2.csrf
   5         #:lw2.graphql
   6         #:lw2.conditions
   7         #:lw2.routes
   8         #:lw2.response
   9         #:lw2.schema-type
  10         #:lw2.interface-utils
  11         #:lw2.user-context
  12         #:lw2.web-push
  13         #:lw2.comment-threads
  14         #:lw2.data-viewers.post
  15         #:lw2.data-viewers.comment
  16         #:lw2.client-script
  17         #:lw2.resources)
  18   (:import-from #:alexandria #:with-gensyms #:once-only #:ensure-list #:when-let #:when-let* #:if-let #:alist-hash-table)
  19   (:import-from #:collectors #:with-collector)
  20   (:import-from #:ppcre #:regex-replace-all)
  21   (:unintern
  22     #:define-regex-handler #:*fonts-stylesheet-uri* #:generate-fonts-link
  23     #:user-nav-bar #:*primary-nav* #:*secondary-nav* #:*nav-bars*
  24     #:begin-html #:end-html
  25     #:*fonts-stylesheet-uris* #:*fonts-redirect-data* #:*fonts-redirect-lock* #:*fonts-redirect-thread*
  26     #:postprocess-conversation-title
  27     #:map-output
  28     #:*earliest-post*
  29     #:*extra-external-scripts* #:*extra-inline-scripts*
  30     #:site-stylesheets #:site-inline-scripts #:site-scripts #:site-external-scripts #:site-head-elements
  31     #:unwrap-stream
  32     #:sort-comments
  33     #:*html-head*
  34     #:with-open-tag)
  35   (:recycle #:lw2-viewer #:lw2.backend))
  36
  37 (in-package #:lw2-viewer)
  38
  39 (named-readtables:in-readtable html-reader)
  40
  41 (add-template-directory (asdf:system-relative-pathname "lw2-viewer" "templates/"))
  42
  43 (define-cache-database 'backend-lw2-legacy
  44     "auth-token-to-userid" "auth-token-to-username" "user-ignore-list")
  45
  46 (defvar *read-only-mode* nil)
  47 (defvar *read-only-default-message* "Due to a system outage, you cannot log in or post at this time.")
  48
  49 (defparameter *default-prefs* (alist :items-per-page 20 :default-sort "new"))
  50 (defvar *current-prefs* nil)
  51
  52 (defun get-post-sequences (post-id)
  53   (when-let (sequence-ids (get-post-sequence-ids post-id))
  54     (with-collector (col)
  55       (dolist (sequence-id sequence-ids)
  56         (let* ((sequence (get-sequence sequence-id))
  57                (posts (sequence-post-ids sequence)))
  58           (multiple-value-bind (prev next)
  59               (loop for prev = nil then (car current)
  60                  for current on posts
  61                  when (string= (car current) post-id)
  62                  return (values prev (second current)))
  63             (when (or prev next)
  64               (col (list sequence
  65                          (and prev (get-sequence-post sequence prev))
  66                          (and next (get-sequence-post sequence next))))))))
  67       (col))))
  68
  69 (defun rectify-post-relations (post-relations)
  70   (remove-if-not (lambda (pr) (cdr (assoc :--id (cdr (first pr))))) post-relations))
  71
  72 (defun post-nav-links (post post-sequences)
  73   <nav class="post-nav-links">
  74     (schema-bind (:post post (target-post-relations source-post-relations) :context :body)
  75       (let ((target-post-relations (rectify-post-relations target-post-relations))
  76             (source-post-relations (rectify-post-relations source-post-relations)))
  77         (when (or target-post-relations source-post-relations)
  78           <div class="related-posts">
  79           (dolist (relations `((,source-post-relations "Parent question")
  80                                (,target-post-relations "Sub-question")))
  81             (destructuring-bind (related-posts relation-type) relations
  82               (when related-posts
  83                 <div class="related-post-group">
  84                   <div class="related-post-type">("~A~A" relation-type (if (second related-posts) "s" ""))</div>
  85                   (dolist (post-relation related-posts)
  86                     (post-headline-to-html (or (cdr (assoc :source-post post-relation))
  87                                                (cdr (assoc :target-post post-relation)))))
  88                 </div>)))
  89           </div>)))
  90     (loop for (sequence prev next) in post-sequences do
  91       (progn
  92         <div class="post-nav-item sequence">
  93           <a class="post-nav sequence-title" href=("/s/~A" (cdr (assoc :--id sequence)))>
  94             <span class="post-nav-label">Part of the sequence:</span>
  95             <span class="post-nav-title">(safe (clean-text-to-html (cdr (assoc :title sequence))))</span>
  96           </a>
  97           (labels ((post-nav-link (direction post)
  98                      <a class=("post-nav ~A" (string-downcase direction)) href=(generate-item-link :post post)>
  99                        <span class="post-nav-label">(case direction (:prev "Previous: ") (:next "Next: "))</span>
 100                        <span class="post-nav-title">(safe (clean-text-to-html (cdr (assoc :title post))))</span>
 101                      </a>))
 102             (when prev (post-nav-link :prev prev))
 103             (when next (post-nav-link :next next)))
 104       </div>))
 105   </nav>)
 106
 107 (defun rectify-conversation (conversation)
 108   (alist-bind ((title (or null string)))
 109               conversation
 110     (if (or (null title) (string= title ""))
 111         (acons :title "[Untitled conversation]" conversation)
 112         conversation)))
 113
 114 (defun conversation-message-to-html (out-stream message)
 115   (alist-bind ((user-id string)
 116                (created-at string)
 117                (highlight-new boolean)
 118                (conversation list)
 119                (content list)
 120                (contents list)
 121                (html-body (or string null)))
 122               message
 123     (let ((conversation (rectify-conversation conversation)))
 124       (multiple-value-bind (pretty-time js-time) (pretty-time created-at)
 125         (format out-stream "<div class=\"comment private-message~A\"><div class=\"comment-meta\"><a class=\"author\" href=\"/users/~A\">~A</a> <span class=\"date\" data-js-date=\"~A\">~A~A</span><div class=\"comment-post-title\">Private message in: <a href=\"/conversation?id=~A\">~A</a></div></div><div class=\"body-text comment-body\">"
 126                 (if highlight-new " comment-item-highlight" "")
 127                 (encode-entities (get-user-slug user-id))
 128                 (encode-entities (get-username user-id))
 129                 js-time
 130                 pretty-time
 131                 (pretty-time-js)
 132                 (encode-entities (cdr (assoc :--id conversation)))
 133                 (encode-entities (cdr (assoc :title conversation)))))
 134       (labels ((ws (html-body) (let ((*memoized-output-stream* out-stream)) (clean-html* html-body))))
 135         (cond
 136           (contents (ws (cdr (assoc :html contents))))
 137           (html-body (ws html-body))
 138           (t (format out-stream "~{<p>~A</p>~}" (loop for block in (cdr (assoc :blocks content)) collect (encode-entities (cdr (assoc :text block))))))))
 139       (format out-stream "</div></div>"))))
 140
 141 (defun conversation-index-to-html (out-stream conversation)
 142   (alist-bind ((conversation-id string :--id)
 143                (title (or null string))
 144                (created-at (or null string))
 145                (participants list)
 146                (messages-total fixnum))
 147     (rectify-conversation conversation)
 148     (multiple-value-bind (pretty-time js-time) (if created-at (pretty-time created-at) (values "[Error]" 0))
 149       (format out-stream "<h1 class=\"listing\"><a href=\"/conversation?id=~A\">~A</a></h1><div class=\"post-meta\"><div class=\"conversation-participants\"><ul>~:{<li><a href=\"/users/~A\">~A</a></li>~}</ul></div><div class=\"messages-count\">~A</div><div class=\"date\" data-js-date=\"~A\">~A~A</div></div>"
 150               (encode-entities conversation-id)
 151               (encode-entities title)
 152               (loop for p in participants
 153                     collect (list (encode-entities (cdr (assoc :slug p))) (encode-entities (cdr (assoc :display-name p)))))
 154               (pretty-number messages-total "message")
 155               js-time
 156               pretty-time
 157               (pretty-time-js)))))
 158
 159 (defun collection-to-contents (collection &optional (heading-level 1) (used-anchors (make-hash-table :test 'equal)))
 160   (alist-bind ((title (or string null)))
 161               collection
 162               (let ((subcollections (cdr
 163                                      (find-if (lambda (x) (member (car x) '(:books :sequences :chapters) :test #'eq))
 164                                               collection)))
 165                     contents-head contents-tail)
 166                 (labels ((add-contents (c)
 167                            (when c
 168                              (if contents-head
 169                                  (setf (cdr contents-tail) c)
 170                                  (setf contents-head c))
 171                              (setf contents-tail (last c)))))
 172                   (cond
 173                     ((and title (not (cdr (assoc :books collection))))
 174                      (add-contents (list (list heading-level title (title-to-anchor title used-anchors))))
 175                      (dolist (subcollection subcollections)
 176                        (add-contents (collection-to-contents subcollection (1+ heading-level) used-anchors))))
 177                     (:otherwise
 178                      (dolist (subcollection subcollections)
 179                        (add-contents (collection-to-contents subcollection heading-level used-anchors)))))
 180                   contents-head))))
 181
 182 (defun collection-to-html (collection &optional (heading-level 1) (used-anchors (make-hash-table :test 'equal)))
 183   (alist-bind ((title (or string null))
 184                (subtitle (or string null))
 185                (number (or fixnum null))
 186                (contents list)
 187                (posts list))
 188               collection
 189               (let* ((subcollections (cdr
 190                                       (find-if (lambda (x) (member (car x) '(:books :sequences :chapters) :test #'eq))
 191                                                collection)))
 192                      (html-body (cdr (assoc :html contents))))
 193                 (cond
 194                   ((or html-body title posts)
 195                    <section>
 196                      (when (or html-body title)
 197                        <div class="body-text sequence-text">
 198                          (when title
 199                            (with-html-stream-output (:stream stream)
 200                              (format stream "<h~A id=\"~A\" class=\"sequence-chapter\">~@[~A. ~]~A</h~A>"
 201                                      heading-level
 202                                      (title-to-anchor title used-anchors)
 203                                      number
 204                                      (clean-text-to-html title)
 205                                      heading-level)))
 206                          (when (assoc :books collection)
 207                            (contents-to-html (collection-to-contents collection) 1 *html-output*))
 208                          (when subtitle
 209                            <div class="sequence-subtitle">(safe (clean-text-to-html subtitle))</div>)
 210                          (when html-body
 211                            (with-html-stream-output (:stream stream)
 212                              (let ((*memoized-output-stream* stream)) (clean-html* html-body))))
 213                          </div>)
 214                      (if posts
 215                          (dolist (post posts)
 216                            (post-headline-to-html post))
 217                          (dolist (subcollection subcollections)
 218                            (collection-to-html subcollection (1+ heading-level) used-anchors)))
 219                    </section>)
 220                   (:otherwise
 221                    (dolist (subcollection subcollections)
 222                      (collection-to-html subcollection heading-level used-anchors)))))))
 223
 224 (defun sequence-to-html (sequence)
 225   (labels ((contents-to-html (contents &key title subtitle number)
 226              (let ((html-body (cdr (assoc :html contents))))
 227                (when (or html-body title subtitle)
 228                  <div class="body-text sequence-text">
 229                    (when title
 230                      <h1 class="sequence-chapter">(safe (format nil "~@[~A. ~]~A" number (clean-text-to-html title :hyphenation nil)))</h1>)
 231                    (when subtitle
 232                      <div class="sequence-subtitle">(clean-text-to-html subtitle)</div>)
 233                    (with-html-stream-output (:stream stream)
 234                      (when html-body
 235                        (let ((*memoized-output-stream* stream)) (clean-html* html-body))))
 236                  </div>)))
 237            (chapter-to-html (chapter)
 238              (alist-bind ((title (or string null))
 239                            (subtitle (or string null))
 240                            (number (or fixnum null))
 241                            (contents list)
 242                            (posts list))
 243                          chapter
 244                 <section>
 245                   (with-html-stream-output
 246                     (contents-to-html contents :title title :subtitle subtitle :number number)
 247                     <section>
 248                       (with-html-stream-output
 249                           (dolist (post posts)
 250                             (post-headline-to-html post)))
 251                     </section>)
 252                 </section>)))
 253   (alist-bind ((sequence-id string :--id)
 254                (title string)
 255                (created-at string)
 256                (user-id string)
 257                (chapters list)
 258                (contents list))
 259               sequence
 260     (multiple-value-bind (pretty-time js-time) (pretty-time created-at)
 261       <article>
 262         (if chapters
 263           <h1 class="post-title">(safe (clean-text-to-html title :hyphenation nil))</h1>
 264           <h1 class="listing"><a href=("/s/~A" sequence-id)>(safe (clean-text-to-html title :hyphenation nil))</a></h1>)
 265         <div class="post-meta">
 266           <a class=("author~{ ~A~}" (list-cond ((logged-in-userid user-id) "own-user-author")))
 267              href=("/users/~A" (get-user-slug user-id))
 268              data-userid=user-id>
 269             (get-username user-id)
 270           </a>
 271           <div class="date" data-js-date=js-time>
 272             (safe pretty-time)
 273             (safe (pretty-time-js))
 274           </div>
 275         </div>
 276         (with-html-stream-output
 277             (when chapters
 278               (contents-to-html contents)
 279               (dolist (chapter chapters)
 280                 (chapter-to-html chapter))))
 281       </article>))))
 282
 283 (defun comment-post-interleave (list &key limit offset (sort-by :date))
 284   (multiple-value-bind (sort-fn sort-key)
 285     (ecase sort-by
 286       (:date (values #'local-time:timestamp> (lambda (x) (local-time:parse-timestring (cdr (assoc :posted-at x))))))
 287       (:date-reverse (values #'local-time:timestamp< (lambda (x) (local-time:parse-timestring (cdr (assoc :posted-at x))))))
 288       (:score (values #'> (lambda (x) (cdr (assoc :base-score x))))))
 289     (let ((sorted (sort list sort-fn :key sort-key)))
 290       (loop for end = (if (or limit offset) (+ (or limit 0) (or offset 0)))
 291             for x in sorted
 292             for count from 0
 293             until (and end (>= count end))
 294             when (or (not offset) (>= count offset))
 295             collect x))))
 296
 297 (defun identify-item (x)
 298   (typecase x
 299     (cons
 300      (if-let (typename (cdr (assoc :----typename x)))
 301              (find-symbol (string-upcase typename) (find-package :keyword))
 302              (cond
 303                ((assoc :message x)
 304                 :notification)
 305                ((assoc :comment-count x)
 306                 :post)
 307                (t
 308                 :comment))))
 309     (condition :condition)))
 310
 311 (defun write-index-items-to-html (out-stream items &key need-auth (empty-message "No entries.") skip-section)
 312   (if items
 313       (dolist (x items)
 314         (with-error-html-block ()
 315           (ecase (identify-item x)
 316             (:condition
 317              (error-to-html x))
 318             (:notification
 319              (format out-stream "<p>~A</p>" (cdr (assoc :message x))))
 320             (:message
 321              (format out-stream "<ul class=\"comment-thread\"><li class=\"comment-item depth-odd\">")
 322              (unwind-protect
 323                   (conversation-message-to-html out-stream x)
 324                (format out-stream "</li></ul>")))
 325             (:conversation
 326              (conversation-index-to-html out-stream x))
 327             (:post
 328              (post-headline-to-html x :need-auth (or need-auth (cdr (assoc :draft x))) :skip-section skip-section))
 329             (:comment
 330              (comment-thread-to-html out-stream
 331                                      (lambda () (comment-item-to-html out-stream x :with-post-title t))))
 332             (:sequence
 333              (sequence-to-html x)))))
 334       (format out-stream "<div class=\"listing-message\">~A</div>" empty-message)))
 335
 336 (defun write-index-items-to-rss (out-stream items &key title need-auth)
 337   (let ((full-title (format nil "~@[~A - ~]~A" title (site-title *current-site*)))
 338         (items (firstn (sort-items items :new) 20)))
 339     (xml-emitter:with-rss2 (out-stream :encoding "UTF-8")
 340       (xml-emitter:rss-channel-header full-title (site-uri *current-site*) :description full-title)
 341       (labels ((emit-item (item &key title link (guid (cdr (assoc :--id item))) (author (get-username (cdr (assoc :user-id item))))
 342                                 (date (pretty-time (cdr (assoc :posted-at item)) :format local-time:+rfc-1123-format+)) body)
 343                           (xml-emitter:rss-item
 344                             title
 345                             :link link
 346                             :author author
 347                             :pubDate date
 348                             :guid guid
 349                             :description body)))
 350         (dolist (item items)
 351           (ecase (identify-item item)
 352             (:post
 353              (let ((author (get-username (cdr (assoc :user-id item))))
 354                    (is-event (cdr (assoc :is-event item))))
 355                (emit-item item
 356                           :title (clean-text (format nil "~A by ~A" (cdr (assoc :title item)) author))
 357                           :author author
 358                           :link (generate-post-auth-link item :absolute t :need-auth need-auth :item-subtype (if is-event "event" "post"))
 359                           :body (clean-html (or (cdr (assoc :html-body (get-post-body (cdr (assoc :--id item)) :revalidate nil))) "") :post-id (cdr (assoc :--id item))))))
 360             (:comment
 361              (schema-bind (:comment item (comment-id post-id user-id html-body))
 362                (when post-id ; XXX fixme
 363                  (emit-item item
 364                             :title (format nil "Comment by ~A on ~A" (get-username user-id) (get-post-title post-id))
 365                             :link (generate-item-link :post post-id :comment-id comment-id :absolute t)
 366                             :body (clean-html html-body)))))))))))
 367
 368 (defun search-bar-to-html (out-stream)
 369   (declare (special *current-search-query*))
 370   (let ((query (and (boundp '*current-search-query*) (hunchentoot:escape-for-html *current-search-query*))))
 371     (format out-stream "<form action=\"/search\" class=\"nav-inner\"><input name=\"q\" type=\"search\" ~@[value=\"~A\"~] autocomplete=\"off\" accesskey=\"s\" title=\"Search [s]~@[&#10;Tip: Paste a ~A URL here to jump to that page.~]\"><button>Search</button></form>" query (main-site-title *current-site*))))
 372
 373 (defun inbox-to-html (out-stream user-slug &optional new-messages)
 374   (let* ((target-uri (format nil "/users/~A?show=inbox" user-slug))
 375          (as-link (string= (hunchentoot:request-uri*) target-uri)))
 376     (multiple-value-bind (nm-class nm-text)
 377       (if new-messages (values "new-messages" "New messages") (values "no-messages" "Inbox"))
 378       (format out-stream "<~:[a href=\"~A\"~;span~*~] id=\"inbox-indicator\" class=\"~A\" accesskey=\"o\" title=\"~A~:[ [o]~;~]\">~A</a>"
 379               as-link target-uri nm-class nm-text as-link nm-text))))
 380
 381 (defmethod site-nav-bars ((site site))
 382   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 383                      ("about" "/about" "About" :accesskey "t")
 384                      ("search" "/search" "Search" :html search-bar-to-html)
 385                      user-nav-item))
 386     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 387                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 388
 389 (defmethod site-nav-bars ((site lesswrong-viewer-site))
 390   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 391                      ("sequences" "/library" "Sequences" :description "Sequences" :accesskey "q")
 392                      ("about" "/about" "About" :accesskey "t")
 393                      ("search" "/search" "Search" :html search-bar-to-html)
 394                      user-nav-item))
 395     (:tertiary-bar (("questions" "/index?view=questions" "Questions")
 396                     ("events" "/index?view=events" "Events")
 397                     ("shortform" "/shortform" "Shortform" :description "Latest Shortform posts")
 398                     ("alignment-forum" "/index?view=alignment-forum" "Alignment Forum")
 399                     ("alignment-forum-comments" "/recentcomments?view=alignment-forum" "AF Comments")))
 400     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 401                    ("featured" "/index?view=featured" "Featured" :description "Latest featured posts" :accesskey "f")
 402                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 403                    ("tags" "/tags" "Tags" :description "All tags" :accesskey "v")
 404                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 405
 406 (defmethod site-nav-bars ((site ea-forum-viewer-site))
 407   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 408                      ("about" "/about" "About" :accesskey "t")
 409                      ("search" "/search" "Search" :html search-bar-to-html)
 410                      user-nav-item))
 411     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 412                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 413                    ("tags" "/tags" "Wiki" :description "Wiki pages and tags" :accesskey "v")
 414                    ("shortform" "/shortform" "Shortform" :description "Latest Shortform posts")
 415                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 416
 417 (defmethod site-nav-bars ((site progress-forum-viewer-site))
 418   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 419                      ("about" "/about" "About" :accesskey "t")
 420                      ("search" "/search" "Search" :html search-bar-to-html)
 421                      user-nav-item))
 422     (:tertiary-bar (("questions" "/index?view=questions" "Questions")
 423                     ("events" "/index?view=events" "Events")
 424                     ("shortform" "/shortform" "Shortform" :description "Latest Shortform posts")))
 425     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 426                    ("featured" "/index?view=featured" "Featured" :description "Latest featured posts" :accesskey "f")
 427                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 428                    ("tags" "/tags" "Tags" :description "All tags" :accesskey "v")
 429                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 430
 431 (defun prepare-nav-bar (nav-bar current-uri)
 432   (list (first nav-bar)
 433         (map 'list (lambda (item) (if (listp item) item (funcall item current-uri)))
 434              (second nav-bar))))
 435
 436 (defun nav-item-active (item current-uri)
 437   (when item
 438     (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 439       (declare (ignore id name description html accesskey nofollow trailing-html))
 440       (string= (or override-uri uri) current-uri))))
 441
 442 (defun nav-bar-active (nav-bar current-uri)
 443   (some (lambda (x) (nav-item-active x current-uri)) (second nav-bar)))
 444
 445 (defun nav-bar-inner (out-stream items &optional current-uri)
 446   (maplist (lambda (items)
 447              (let ((item (first items)))
 448                (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 449                  (declare (ignore override-uri))
 450                  (let* ((item-active (nav-item-active item current-uri))
 451                         (nav-class (format nil "nav-item ~:[nav-inactive~;nav-current~]~:[~; nav-item-last-before-current~]"
 452                                            item-active (and (not item-active) (nav-item-active (cadr items) current-uri)))))
 453                      (format out-stream "<span id=\"nav-item-~A\" class=\"~A\" ~@[title=\"~A\"~]>"
 454                              id nav-class description)
 455                      (if html
 456                          (funcall html out-stream)
 457                          (link-if-not out-stream item-active uri "nav-inner" name :accesskey accesskey :nofollow nofollow))
 458                      (if trailing-html
 459                          (funcall trailing-html out-stream))
 460                      (format out-stream "</span>")))))
 461            items))
 462
 463 (defun nav-bar-outer (out-stream class nav-bar &optional current-uri)
 464   (format out-stream "<nav id=\"~A\" class=\"nav-bar~@[ ~A~]\">" (string-downcase (first nav-bar)) class)
 465   (nav-bar-inner out-stream (second nav-bar) current-uri)
 466   (format out-stream "</nav>"))
 467
 468 (defun nav-bar-to-html (out-stream class current-uri)
 469   (let* ((nav-bars (map 'list (lambda (x) (prepare-nav-bar x current-uri)) (site-nav-bars *current-site*)))
 470          (active-bar (or (find-if (lambda (x) (nav-bar-active x current-uri)) nav-bars) (car (last nav-bars))))
 471          (inactive-bars (remove active-bar nav-bars)))
 472     (dolist (bar inactive-bars)
 473       (nav-bar-outer out-stream (format nil "~@[~A ~]inactive-bar" class) bar current-uri))
 474     (nav-bar-outer out-stream (format nil "~@[~A ~]active-bar" class) active-bar current-uri)))
 475
 476 (defun user-nav-item (&optional current-uri)
 477   (if *read-only-mode*
 478       `("login" "/login" "Read Only Mode" :html ,(lambda (out-stream)
 479                                                          (format out-stream "<span class=\"nav-inner\" title=\"~A\">[Read Only Mode]</span>"
 480                                                                  (typecase *read-only-mode*
 481                                                                    (string *read-only-mode*)
 482                                                                    (t *read-only-default-message*)))))
 483       (if-let (username (logged-in-username))
 484               (let ((user-slug (encode-entities (logged-in-user-slug))))
 485                 `("login" ,(format nil "/users/~A" user-slug) ,(plump:encode-entities username) :description "User page" :accesskey "u"
 486                           :trailing-html ,(lambda (out-stream) (inbox-to-html out-stream user-slug))))
 487               `("login" "/login" "Log In"
 488                         :html ,(lambda (out-stream)
 489                                  (write-string "<form action='/login' id='login-button-form'><input type='hidden' name='return' value='" out-stream)
 490                                  (encode-entities current-uri out-stream)
 491                                  (write-string "'></form><button class='nav-inner' form='login-button-form' accesskey='u'>Log In</button>" out-stream))))))
 492
 493 (defun sublevel-nav-to-html (options current &key default (base-uri (hunchentoot:request-uri*)) (param-name "show") (remove-params '("offset")) extra-class)
 494   (declare (type (or null string) extra-class))
 495   (let ((out-stream *html-output*))
 496     (format out-stream "<nav class=\"sublevel-nav~@[ ~A~]\">" extra-class)
 497     (loop for item in options
 498        do (destructuring-bind (param-value &key (text (string-capitalize param-value)) description) (if (atom item) (list item) item)
 499             (let* ((param-value (string-downcase param-value))
 500                    (selected (string-equal current param-value))
 501                    (class (if selected "sublevel-item selected" "sublevel-item")))
 502               (link-if-not out-stream selected (apply #'replace-query-params base-uri param-name (unless (string-equal param-value default) param-value)
 503                                                       (loop for x in remove-params nconc (list x nil)))
 504                            class text :title description))))
 505     (format out-stream "</nav>")))
 506
 507 (defmacro set-script-variables (&rest clauses)
 508   (with-gensyms (out-stream name value)
 509     `(with-html-stream-output (:stream ,out-stream)
 510        ,.(loop for clause in clauses
 511             collect (destructuring-bind (name-form value-form) clause
 512                       `(let ((,name ,name-form)
 513                              (,value ,value-form))
 514                          (declare (dynamic-extent ,name ,value))
 515                          (write-string ,name ,out-stream)
 516                          (write-string "=" ,out-stream)
 517                          (json:encode-json ,value ,out-stream)
 518                          (write-string #.(format nil ";~%") ,out-stream)))))))
 519
 520 (defun html-body (out-stream fn &key title description social-description current-uri content-class robots extra-head)
 521   (macrolet ((for-resource-type ((resource-type &rest args) &body body)
 522                (with-gensyms (resource)
 523                  `(dolist (,resource page-resources)
 524                     (when (eq (first ,resource) ,resource-type)
 525                       (destructuring-bind ,args (rest ,resource)
 526                         ,@body))))))
 527     (with-html-stream-output
 528         (let* ((session-token (hunchentoot:cookie-in "session-token"))
 529                (csrf-token (and session-token (make-csrf-token session-token)))
 530                (hide-nav-bars (truthy-string-p (hunchentoot:get-parameter "hide-nav-bars")))
 531                (preview *preview*)
 532                (page-resources (nreverse *page-resources*))
 533                (site-domain (site-domain *current-site*)))
 534           (setf *page-resources* nil)
 535           (write-string "<!DOCTYPE html><html lang=\"en-US\"><head>
 536 <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
 537 <meta name=\"HandheldFriendly\" content=\"True\" />"
 538                         out-stream)
 539           (with-delimited-writer (out-stream delimit :begin "<script>" :end "</script>")
 540             (when site-domain
 541               (delimit)
 542               (set-script-variables ("document.domain" site-domain))) ; Requires origin-agent-cluster header, see below
 543             (unless preview
 544               (delimit)
 545               (when (typep *current-site* 'login-site)
 546                 (set-script-variables
 547                  ("loggedInUserId" (or (logged-in-userid) ""))
 548                  ("loggedInUserDisplayName" (or (logged-in-username) ""))
 549                  ("loggedInUserSlug" (or (logged-in-user-slug) ""))))
 550               (set-script-variables
 551                ("applicationServerKey" (get-vapid-public-key))
 552                ("GW" (alist "useFancyFeatures" (not (typep *current-site* 'arbital-site))
 553                             "secureCookies" (to-boolean (site-secure *current-site*))
 554                             "csrfToken" csrf-token
 555                             "assets" (alist "popup.svg" (generate-versioned-link "/assets/popup.svg"))
 556                             "sites" (if site-domain
 557                                         (loop for site in *sites*
 558                                            when (let ((sd (site-domain site))) (and sd (string-equal sd site-domain)))
 559                                            collect (cons (site-host site) t))
 560                                         (alist (site-host *current-site*) t)))))
 561               (for-resource-type (:inline-script script-text)
 562                                  (write-string ";" out-stream)
 563                                  (write-string script-text out-stream))))
 564           (unless preview
 565             (funcall lw2.resources::*script-tags* out-stream)
 566             (for-resource-type (:script uri)
 567                                (format out-stream "<script src=\"~A\"></script>" uri))
 568             (funcall lw2.resources::*async-script-tags* out-stream)
 569             (for-resource-type (:async-script uri)
 570                                (format out-stream "<script src=\"~A\" async></script>" uri)))
 571           (funcall lw2.resources::*style-tags* out-stream)
 572           (for-resource-type (:stylesheet uri &key media class)
 573                              (format out-stream "<link rel=\"stylesheet\" href=\"~A\"~@[ media=\"~A\"~]~@[ class=\"~A\"~]>" uri media class))
 574           (generate-fonts-html-headers (site-fonts-source *current-site*))
 575           (format out-stream "<link rel=\"shortcut icon\" href=\"~A\">"
 576                   (generate-versioned-link "/assets/favicon.ico"))
 577           (format out-stream "<title>~@[~A - ~]~A</title>~@[<meta name=\"description\" content=\"~A\">~]~@[<meta name=\"robots\" content=\"~A\">~]"
 578                   (if title (encode-entities title))
 579                   (site-title *current-site*)
 580                   description
 581                   robots)
 582           (unless preview
 583             (when title
 584               <meta property="og:title" content=title>)
 585             (when social-description
 586               <meta property="og:description" content=social-description>
 587               <meta property="og:type" content="article">))
 588           (with-delimited-writer (out-stream delimit :begin "<style>" :between #.(format nil "~%") :end "</style>")
 589             (unless (and (typep *current-site* 'login-site) (logged-in-userid))
 590               (delimit)
 591               (write-string "button.vote { display: none }" out-stream))
 592             (when *memoized-output-without-hyphens*
 593               ;; The browser has been detected as having bugs related to soft-hyphen characters.
 594               ;; But there is some hope that it could still do hyphenation by itself.
 595               (delimit)
 596               (write-string ".body-text { hyphens: auto; -ms-hyphens: auto; -webkit-hyphens: auto; }" out-stream)))
 597           (when preview
 598             (format out-stream "<base target='_top'>"))
 599           (when extra-head (funcall extra-head))
 600           (format out-stream "</head>")
 601           (unwind-protect
 602                (progn
 603                  (format out-stream "<body class=\"~{~A~^ ~}\"><div id=\"content\"~@[ class=\"~{~A~^ ~}\"~]>"
 604                          (let* ((theme (nonempty-string (hunchentoot:cookie-in "theme")))
 605                                 (dark-mode (nonempty-string (hunchentoot:cookie-in "dark-mode"))))
 606                            (list-cond (t (format nil "theme-~A" (or theme "default")))
 607                                       (dark-mode (format nil "force-~A-mode" dark-mode))))
 608                          (list-cond (content-class content-class)
 609                                     (hide-nav-bars "no-nav-bars")
 610                                     (preview "preview")))
 611                  (unless (or hide-nav-bars preview)
 612                    (nav-bar-to-html out-stream "nav-bar-top" (or current-uri (replace-query-params (hunchentoot:request-uri*) "offset" nil "sort" nil)))
 613                    (when (and (typep *current-site* 'login-site) (logged-in-userid))
 614                      (call-with-server-data 'process-user-status "/current-user-status")))
 615                  (activate-client-trigger "navBarLoaded")
 616                  (funcall fn))
 617             (format out-stream "</div></body></html>"))))))
 618
 619 (defun replace-query-params (uri &rest params)
 620   (let* ((quri (quri:uri uri))
 621          (old-params (quri:uri-query-params quri))
 622          (new-params (loop with out = old-params
 623                            for (param value) on params by #'cddr
 624                            do (if value
 625                                   (if-let (old-cons (assoc param out :test #'equal))
 626                                           (setf (cdr old-cons) value)
 627                                           (setf out (nconc out (list (cons param value)))))
 628                                   (setf out (remove-if (lambda (x) (equal (car x) param)) out)))
 629                            finally (return out))))
 630     (if new-params
 631       (setf (quri:uri-query-params quri) new-params)
 632       (setf (quri:uri-query quri) nil))
 633     (quri:render-uri quri)))
 634
 635 (defun pagination-nav-bars (&key offset total with-next (items-per-page (user-pref :items-per-page)))
 636   (if *preview*
 637       (lambda (out-stream fn)
 638         (declare (ignore out-stream))
 639         (funcall fn))
 640       (lambda (out-stream fn)
 641         (labels ((pages-to-end (n) (< (+ offset (* items-per-page n)) total)))
 642           (let* ((with-next (if total (pages-to-end 1) with-next))
 643                  (next (if (and offset with-next) (+ offset items-per-page)))
 644                  (prev (if (and offset (>= offset items-per-page)) (- offset items-per-page)))
 645                  (request-uri (hunchentoot:request-uri*))
 646                  (first-uri (if (and prev (> prev 0)) (replace-query-params request-uri "offset" nil)))
 647                  (prev-uri (if prev (replace-query-params request-uri "offset" (if (= prev 0) nil prev))))
 648                  (next-uri (if next (replace-query-params request-uri "offset" next)))
 649                  (last-uri (if (and total offset (pages-to-end 2))
 650                                (replace-query-params request-uri "offset" (- total (mod (- total 1) items-per-page) 1)))))
 651             (if (or next prev last-uri)
 652                 (labels ((write-item (uri class title accesskey)
 653                            (format out-stream "<a href=\"~A\" class=\"button nav-item-~A~:[ disabled~;~]\" title=\"~A [~A]\" accesskey=\"~A\"></a>"
 654                                    (or uri "#") class uri title accesskey accesskey)))
 655                   (format out-stream "<nav id='top-nav-bar'>")
 656                   (write-item first-uri "first" "First page" "\\")
 657                   (write-item prev-uri "prev" "Previous page" "[")
 658                   (format out-stream "<span class='page-number'><span class='page-number-label'>Page</span> ~A</span>" (+ 1 (/ (or offset 0) items-per-page)))
 659                   (write-item next-uri "next" "Next page" "]")
 660                   (write-item last-uri "last" "Last page" "/")
 661                   (format out-stream "</nav>")))
 662             (funcall fn)
 663             (nav-bar-outer out-stream nil (list :bottom-bar
 664                                                 (list-cond
 665                                                  (first-uri `("first" ,first-uri "Back to first"))
 666                                                  (prev-uri `("prev" ,prev-uri "Previous" :nofollow t))
 667                                                  (t `("top" "#top" "Back to top"))
 668                                                  (next-uri `("next" ,next-uri "Next" :nofollow t))
 669                                                  (last-uri `("last" ,last-uri "Last" :nofollow t)))))
 670             (format out-stream "<script>document.querySelectorAll('#bottom-bar').forEach(bb => { bb.classList.add('decorative'); });</script>"))))))
 671
 672 (defun decode-json-as-hash-table (json-source)
 673   (let (current-hash-table current-key)
 674     (declare (special current-hash-table current-key))
 675     (json:bind-custom-vars
 676      (:beginning-of-object (lambda () (setf current-hash-table (make-hash-table :test 'equal)))
 677       :object-key (lambda (x) (setf current-key x))
 678       :object-value (lambda (x) (setf (gethash current-key current-hash-table) x))
 679       :end-of-object (lambda () current-hash-table)
 680       :aggregate-scope '(current-hash-table current-key))
 681      (json:decode-json-from-source json-source))))
 682
 683 (defun get-ignore-hash (&optional (user-id (logged-in-userid)))
 684   (if-let (ignore-json (and user-id (cache-get "user-ignore-list" user-id)))
 685           (decode-json-as-hash-table ignore-json)
 686           (make-hash-table :test 'equal)))
 687
 688 (defmacro with-outputs ((out-stream) &body body)
 689   (with-gensyms (stream-sym)
 690     (let ((out-body (map 'list (lambda (x) `(princ ,x ,stream-sym)) body)))
 691       `(let ((,stream-sym ,out-stream))
 692          ,.out-body))))
 693
 694 (defun call-with-emit-page (out-stream fn &key title description social-description current-uri content-class (return-code 200) robots (pagination (pagination-nav-bars)) top-nav extra-head)
 695   (declare (ignore return-code))
 696   (ignore-errors
 697     (log-conditions
 698       (html-body out-stream
 699                  (lambda ()
 700                    (when top-nav (funcall top-nav))
 701                    (funcall pagination out-stream fn))
 702                  :title title :description description :social-description social-description :current-uri current-uri :content-class content-class :robots robots :extra-head extra-head))))
 703
 704 (defun set-cookie (key value &key (max-age (- (expt 2 31) 1)) (path "/"))
 705   (hunchentoot:set-cookie key :value value :path path :max-age max-age :secure (site-secure *current-site*)))
 706
 707 (defun set-default-headers (return-code)
 708   (setf (hunchentoot:content-type*) "text/html; charset=utf-8"
 709         (hunchentoot:return-code*) return-code
 710         (hunchentoot:header-out :link) (let ((output
 711                                               (with-output-to-string (stream)
 712                                                 (with-delimited-writer (stream delimit :between ",")
 713                                                   (funcall lw2.resources::*link-header* stream delimit)))))
 714                                          (when (> (length output) 0)
 715                                            output)))
 716   (unless lw2.resources::*push-option* (set-cookie "push" "t" :max-age (* 4 60 60))))
 717
 718 (defun user-pref (key)
 719   (or (cdr (assoc key *current-prefs*))
 720       (cdr (assoc key *default-prefs*))))
 721
 722 (defun set-user-pref (key value)
 723   (assert (boundp 'hunchentoot:*reply*))
 724   (if value
 725       (setf *current-prefs* (remove-duplicates (acons key value *current-prefs*) :key #'car :from-end t))
 726       (setf *current-prefs* (remove key *current-prefs* :key #'car)))
 727   (set-cookie "prefs" (quri:url-encode (json:encode-json-to-string *current-prefs*))))
 728
 729 (defmacro emit-page ((out-stream &rest args &key (return-code 200) &allow-other-keys) &body body)
 730   (once-only (return-code)
 731     `(progn
 732        (set-default-headers ,return-code)
 733        (with-response-stream (,out-stream)
 734          (dynamic-flet ((fn () ,@body))
 735            (call-with-emit-page ,out-stream
 736                                 #'fn
 737                                 ,@args))))))
 738
 739 (defmethod call-with-backend-context ((backend backend-token-login) (request (eql t)) fn)
 740   (let ((*current-auth-status* (safe-decode-json (hunchentoot:cookie-in "lw2-status"))))
 741     (multiple-value-bind (*current-auth-token* *current-userid* *current-username*)
 742         (let* ((auth-token (hunchentoot:cookie-in "lw2-auth-token"))
 743                (expires (cdr (assoc :expires *current-auth-status*))))
 744           (when (and (nonempty-string auth-token)
 745                      (not *read-only-mode*)
 746                      (or (null expires)
 747                          (and (integerp expires) (<= (get-unix-time) (- expires (* 60 60 24))))))
 748             (with-cache-readonly-transaction
 749                 (values
 750                  auth-token
 751                  (cache-get "auth-token-to-userid" auth-token)
 752                  (cache-get "auth-token-to-username" auth-token)))))
 753       (let ((*current-user-slug* (and *current-userid* (get-user-slug *current-userid*)))
 754             (*enable-rate-limit* (if *current-userid* nil *enable-rate-limit*)))
 755         (funcall fn)))))
 756
 757 (defmethod call-with-site-context ((site ignore-list-site) (request (eql t)) fn)
 758   (call-next-method
 759    site request
 760    (lambda ()
 761      (let ((*current-ignore-hash* (get-ignore-hash)))
 762        (funcall fn)))))
 763
 764 (defun call-with-error-page (fn)
 765   (with-response-context ()
 766     (let* ((*current-prefs* (safe-decode-json (hunchentoot:cookie-in "prefs")))
 767            (*preview* (string-equal (hunchentoot:get-parameter "format") "preview")))
 768       (multiple-value-bind (*revalidate-default* *force-revalidate-default*)
 769           (cond ((ppcre:scan "(?:^|,?)\\s*(?:no-cache|max-age=0)(?:$|,)" (hunchentoot:header-in* :cache-control))
 770                  (values t t))
 771                 (*preview*
 772                  (values nil nil))
 773                 (t
 774                  (values t nil)))
 775         (when (not *revalidate-default*)
 776           (setf (hunchentoot:header-out :cache-control) (format nil "public, max-age=~A" (* 5 60))
 777                 (hunchentoot:header-out :vary) "cookie"))
 778         (when (site-domain *current-site*)
 779           (setf (hunchentoot:header-out :origin-agent-cluster) "?0")) ; Allow document.domain in Chrome: https://developer.chrome.com/blog/immutable-document-domain/
 780         (let ((*memoized-output-without-hyphens*
 781                ;; Soft hyphen characters mess up middle-click paste and screen readers, so try to identify whether they are necessary.
 782                ;; See https://caniuse.com/?search=hyphens
 783                (if-let ((ua (hunchentoot:header-in* :user-agent)))
 784                        (regex-case ua
 785                                    (" Chrome/(\\d+)"
 786                                     (declare (regex-groups-min 1))
 787                                     (or (> (parse-integer (reg 0)) 87)
 788                                         (ppcre:scan "Macintosh|Android" ua)))
 789                                    (" Edge/(\\d+)"
 790                                     (declare (regex-groups-min 1))
 791                                     (> 19 (parse-integer (reg 0))))
 792                                    (t t))
 793                        t)))
 794           (with-page-resources
 795               (catch 'abort-response
 796                 (handler-bind
 797                     ((fatal-error (lambda (condition)
 798                                     (abort-response-if-unrecoverable condition)
 799                                     (let ((error-html (with-output-to-string (*html-output*) (error-to-html condition))))
 800                                       (emit-page (out-stream :title "Error" :return-code (condition-http-return-code condition) :content-class "error-page")
 801                                                  (write-string error-html out-stream)
 802                                                  (when (eq (hunchentoot:request-method*) :post)
 803                                                    <form method="post" class="error-retry-form">
 804                                                    (loop for (key . value) in (hunchentoot:post-parameters*)
 805                                                       do <input type="hidden" name=key value=value>)
 806                                                    <input type="submit" value="Retry">
 807                                                    </form>))
 808                                       (return-from call-with-error-page)))))
 809                   (log-conditions
 810                    (if (or (eq (hunchentoot:request-method*) :post)
 811                            (not (and (boundp '*test-acceptor*) (boundp '*hunchentoot-taskmaster*)))) ; TODO fix this hack
 812                        (funcall fn)
 813                        (sb-sys:with-deadline (:seconds (expt 1.3
 814                                                              (min (round (log 30 1.3))
 815                                                                   (- (hunchentoot:taskmaster-max-thread-count (symbol-value '*hunchentoot-taskmaster*))
 816                                                                      (hunchentoot:acceptor-requests-in-progress (symbol-value '*test-acceptor*))))))
 817                          (funcall fn))))))))))))
 818
 819 (defmacro with-error-page (&body body)
 820   `(dynamic-flet ((fn () ,@body)) (call-with-error-page #'fn)))
 821
 822 (defun output-form (out-stream method action id heading csrf-token fields button-label &key textarea end-html)
 823   (format out-stream "<form method=\"~A\" action=\"~A\" id=\"~A\"><h1>~A</h1>" method action id heading)
 824   (loop for (id label type . params) in fields
 825         do (format out-stream "<label for=\"~A\">~A:</label>" id label)
 826         do (cond
 827              ((string= type "select")
 828               (destructuring-bind (option-list &optional default) params
 829                 (format out-stream "<select name=\"~A\">" id)
 830                 (loop for (value label) in option-list
 831                       do (format out-stream "<option value=\"~A\"~:[~; selected~]>~A</option>" value (string= default value) label))
 832                 (format out-stream "</select>")))
 833              (t
 834                (destructuring-bind (&optional (autocomplete "off") default) params
 835                  (format out-stream "<input type=\"~A\" name=\"~A\" autocomplete=\"~A\"~@[ value=\"~A\"~]>" type id autocomplete (and default (encode-entities default))))))
 836         do (format out-stream ""))
 837   (if textarea
 838     (destructuring-bind (ta-name ta-contents) textarea
 839       (format out-stream "<div class=\"textarea-container\"><textarea name=\"~A\">~A</textarea><span class='markdown-reference-link'>You can use <a href='http://commonmark.org/help/' target='_blank'>Markdown</a> here.</span></div>" ta-name (encode-entities ta-contents))))
 840   (format out-stream "<input type=\"hidden\" name=\"csrf-token\" value=\"~A\"><input type=\"submit\" value=\"~A\">~@[~A~]</form>"
 841           csrf-token button-label end-html))
 842
 843 (defun page-toolbar-to-html (&key title new-post new-conversation logout (rss t) ignore enable-push-notifications)
 844   (unless *preview*
 845     (let ((out-stream *html-output*)
 846           (liu (logged-in-userid)))
 847       (format out-stream "<div class=\"page-toolbar~@[ hide-until-init~]\">" enable-push-notifications)
 848       (when logout
 849         (format out-stream "<form method=\"post\" action=\"/logout\"><input type=\"hidden\" name=\"csrf-token\" value=\"~A\"><button class=\"logout-button button\" name=\"logout\">Log out</button></form>"
 850                 (make-csrf-token)))
 851       (when ignore
 852         (funcall ignore))
 853       (when enable-push-notifications
 854         (format out-stream "<script>document.currentScript.outerHTML='<button id=\"enable-push-notifications\" class=\"button\" style=\"display: none\" data-enabled=\"~:[~;true~]\">~:*~:[En~;Dis~]able push notifications</button>'</script>"
 855                 (find-subscription *current-auth-token*)))
 856       (when (and new-conversation liu)
 857         (multiple-value-bind (text to)
 858             (typecase new-conversation (string (values "Send private message" new-conversation)) (t "New conversation"))
 859           (format out-stream "<a class=\"new-private-message button\" href=\"/conversation~@[?to=~A~]\">~A</a>"
 860                   to text)))
 861       (when (and new-post liu)
 862         (format out-stream "<a class=\"new-post button\" href=\"/edit-post~@[?section=~A~]\" accesskey=\"n\" title=\"Create new post [n]\">New post</a>"
 863                 (typecase new-post (string new-post) (t nil))))
 864       (when (and title rss)
 865         (format out-stream "<a class=\"rss\" rel=\"alternate\" type=\"application/rss+xml\" title=\"~A RSS feed\" href=\"~A\">RSS</a>"
 866                 title (replace-query-params (hunchentoot:request-uri*) "offset" nil "format" "rss")))
 867       (format out-stream "</div>"))))
 868
 869 (defun view-items-index (items &key section title current-uri hide-title need-auth extra-head (pagination (pagination-nav-bars)) (top-nav (lambda () (page-toolbar-to-html :title title))) (content-class "index-page") alternate-html)
 870   (alexandria:switch ((hunchentoot:get-parameter "format") :test #'string=)
 871                      ("rss"
 872                       (setf (hunchentoot:content-type*) "application/rss+xml; charset=utf-8")
 873                       (with-response-stream (out-stream)
 874                         (write-index-items-to-rss out-stream items :title title)))
 875                      (t
 876                        (emit-page (out-stream :title (if hide-title nil title) :description (site-description *current-site*) :content-class content-class
 877                                               :current-uri current-uri :robots (if (hunchentoot:get-parameter :offset) "noindex, nofollow")
 878                                               :pagination pagination :top-nav top-nav :extra-head extra-head)
 879                                   (if alternate-html
 880                                       (funcall alternate-html)
 881                                       (write-index-items-to-html out-stream items
 882                                                                  :need-auth need-auth
 883                                                                  :skip-section section))))))
 884
 885 (defun link-if-not (stream linkp url class text &key accesskey nofollow title)
 886   (declare (dynamic-extent linkp url text))
 887   (if (not linkp)
 888       (format stream "<a href=\"~A\" class=\"~A\"~@[ accesskey=\"~A\"~]~:[~; rel=\"nofollow\"~]~@[ title=\"~A\"~]>~A</a>" url class accesskey nofollow title text)
 889       (format stream "<span class=\"~A\"~@[ title=\"~A\"~]>~A</span>" class title text)))
 890
 891 (defgeneric main-site-link (site item-type item-designator &key)
 892   (:method ((site lw2-frontend-site) (item-type (eql :post)) (post-id string) &key slug comment-id direct-comment-link)
 893     (merge-uris
 894      (format nil "/posts/~A/~A~[~;#~A~;?commentId=~A~]" post-id slug (if comment-id (if direct-comment-link 2 1) 0) comment-id)
 895      (main-site-uri *current-site*)))
 896   (:method ((site lw2-frontend-site) (item-type (eql :tag)) (slug string) &key comment-id direct-comment-link)
 897     (when (not (and comment-id direct-comment-link))
 898       (merge-uris
 899        (format nil "/tag/~A~@[/discussion#~A~]" slug comment-id)
 900        (main-site-uri *current-site*)))))
 901
 902 (defun postprocess-markdown (markdown)
 903   (if (typep *current-site* 'alternate-frontend-site)
 904       (regex-replace-body
 905        ((concatenate 'string (regex-replace-all "\\." (site-uri *current-site*) "\\.") "posts/([^/ ]{17})/([^/# ]*)(?:(#comment-|/comment/|/answer/)([^/ ]{17}))?")
 906         markdown)
 907        (main-site-link *current-site*
 908                        :post (reg 0) :slug (reg 1) :comment-id (reg 3)
 909                        :direct-comment-link (and (reg 3) (reg 2) (string= "/" (reg 2) :end2 1))))
 910       markdown))
 911
 912 (defun redirect (uri &key (type :see-other) preserve-query)
 913   (setf (hunchentoot:return-code*) (ecase type (:see-other 303) (:permanent 301))
 914         (hunchentoot:header-out "Location") (if-let ((query (and preserve-query (hunchentoot:query-string*))))
 915                                                     (quri:render-uri (quri:make-uri :defaults uri :query query))
 916                                                     uri)))
 917
 918 (defun main-site-redirect (uri &key (type :see-other))
 919   (redirect (merge-uris uri (main-site-uri *current-site*)) :type type))
 920
 921 (defmacro request-method (&body method-clauses)
 922   (with-gensyms (request-method)
 923     `(let ((,request-method (hunchentoot:request-method*)))
 924        (cond
 925          ,.(loop for method-body in method-clauses
 926               collect (destructuring-bind (method args &body inner-body) method-body
 927                         `(,(if (eq method :get) `(member ,request-method '(:get :head)) `(eq ,request-method ,method))
 928                            ,(make-binding-form (mapcar (lambda (x) (append (ensure-list x) `(:request-type ,method))) args)
 929                                                inner-body))))))))
 930
 931 (defmacro define-page (name path-specifier additional-vars &body body)
 932   (labels ((make-lambda (args)
 933              (loop for a in args
 934                    collect (if (atom a) a (first a)))))
 935    (multiple-value-bind (path-specifier-form path-bindings-wrapper specifier-vars)
 936     (if (stringp path-specifier)
 937         (values path-specifier #'identity)
 938         (destructuring-bind (specifier-type specifier-body &rest specifier-args) path-specifier
 939           (ecase specifier-type
 940             (:function
 941               (values `(lambda (r) (funcall ,specifier-body (hunchentoot:request-uri r)))
 942                       (if specifier-args
 943                           (lambda (body) `(ignorable-multiple-value-bind ,(make-lambda specifier-args) (funcall ,specifier-body (hunchentoot:request-uri*)) ,body))
 944                           #'identity)
 945                       specifier-args))
 946             (:regex
 947               (let ((fn `(lambda (r) (ppcre:scan-to-strings ,specifier-body (hunchentoot:request-uri r)))))
 948                 (values fn
 949                         (lambda (body)
 950                           (with-gensyms (result-vector)
 951                             `(let ((,result-vector (nth-value 1 (funcall ,fn hunchentoot:*request*))))
 952                                (declare (type simple-vector ,result-vector)
 953                                         (ignorable ,result-vector))
 954                                (let
 955                                  ,(loop for v in (make-lambda specifier-args) as x from 0 collecting `(,v (if (> (length ,result-vector) ,x) (aref ,result-vector ,x))))
 956                                  ,body))))
 957                         specifier-args))))))
 958      `(hunchentoot:define-easy-handler (,name :uri ,path-specifier-form) ()
 959         (with-error-page
 960             (block nil
 961               ,(funcall path-bindings-wrapper
 962                         (make-binding-form (append (mapcar (lambda (x) (append (ensure-list x) '(:passthrough t))) specifier-vars) additional-vars)
 963                                            body))))))))
 964
 965 (define-component sort-widget (&key (sort-options '((:new :description "Sort by date posted")
 966                                                     (:hot :description "Sort by time-weighted score")
 967                                                     (:active :description "Sort by date posted or last comment")
 968                                                     (:old :description "Sort by date posted, oldest first")))
 969                                     (pref :default-sort) (param-name "sort") (html-class "sort"))
 970   (:http-args ((sort :real-name param-name :member (mapcar (lambda (x) (if (listp x) (first x) x)) sort-options))
 971                (sortedby :real-name "sortedBy" :type string)
 972                &without-csrf-check))
 973   (if sortedby
 974       (progn
 975         (renderer () nil)
 976         sortedby)
 977       (let ((sort-string (if sort (string-downcase sort))))
 978         (if sort-string
 979             (set-user-pref :default-sort sort-string))
 980         (renderer ()
 981                   (sublevel-nav-to-html sort-options
 982                                         (user-pref pref)
 983                                         :param-name param-name
 984                                         :extra-class html-class))
 985         (or sort-string (user-pref pref)))))
 986
 987 (defun handle-last-modified (last-modified)
 988   (when last-modified
 989     (let ((last-modified (max last-modified (load-time-value (get-universal-time)))))
 990       (setf (hunchentoot:header-out :last-modified) (hunchentoot:rfc-1123-date last-modified)
 991             (hunchentoot:header-out :vary) "cookie")
 992       (hunchentoot:handle-if-modified-since last-modified))))
 993
 994 (define-component view-index ()
 995   (:http-args ((view :member '(:all :new :frontpage :featured :alignment-forum :questions :nominations :reviews :events) :default :frontpage)
 996                before after
 997                (offset :type fixnum)
 998                (limit :type fixnum :default (user-pref :items-per-page))
 999                (karma-threshold :type fixnum)
1000                &without-csrf-check))
1001   (when (eq view :new) (redirect (replace-query-params (hunchentoot:request-uri*) "view" "all" "all" nil) :type :permanent) (return))
1002   (component-value-bind ((sort-string sort-widget))
1003     (multiple-value-bind (posts total last-modified)
1004         (get-posts-index :view (string-downcase view) :before before :after after :offset offset :limit (1+ limit) :sort sort-string :karma-threshold karma-threshold)
1005       (handle-last-modified last-modified)
1006       (let ((page-title (format nil "~@(~A posts~)" view)))
1007         (renderer ()
1008                   (view-items-index (firstn posts limit)
1009                                     :section view :title page-title :hide-title (eq view :frontpage)
1010                                     :pagination (pagination-nav-bars :offset (or offset 0) :total total :with-next (and (not total) (> (length posts) limit)))
1011                                     :content-class (format nil "index-page ~(~A~)-index-page" view)
1012                                     :top-nav (lambda ()
1013                                                (page-toolbar-to-html :title page-title
1014                                                                      :new-post (if (eq view :meta) "meta" t))
1015                                                (funcall sort-widget))))))))
1016
1017 (defmacro route-component (name lambda-list &rest args)
1018   `(lambda ,lambda-list
1019      (with-error-page
1020          (component-value-bind ((() (,name ,@args)))
1021                                (when ,name
1022                                  (funcall ,name))))))
1023
1024 (defmacro define-component-routes (site-class &rest clauses)
1025   `(progn
1026      ,@(iter
1027         (for clause in clauses)
1028         (destructuring-bind (name (route-class &rest route-args) route-bindings (component-name &rest component-args)) clause
1029           (collect `(define-route ',site-class ',route-class
1030                       :name ',name ,@route-args
1031                       :handler (route-component ,component-name ,route-bindings ,@component-args)))))))
1032
1033 (define-component-routes forum-site
1034   (view-root (standard-route :uri "/") () (view-index))
1035   (view-index (standard-route :uri "/index") () (view-index)))
1036
1037 (hunchentoot:define-easy-handler
1038     (view-site-routes
1039      :uri (lambda (req)
1040             (declare (ignore req))
1041             (with-site-context ((let ((host (or (hunchentoot:header-in* :x-forwarded-host) (hunchentoot:header-in* :host))))
1042                                   (or (find-site host)
1043                                       (error "Unknown site: ~A" host))))
1044               (call-route-handler *current-site* (hunchentoot:script-name*)))))
1045     nil)
1046
1047 (define-page view-post "/post" ((id :required t))
1048   (redirect (generate-item-link :post id) :type :permanent))
1049
1050 (define-page view-post-lw1-link (:function #'match-lw1-link) ()
1051   (redirect (convert-lw1-link (hunchentoot:script-name*)) :preserve-query t :type :permanent))
1052
1053 (define-page view-post-ea1-link (:function #'match-ea1-link) ()
1054   (redirect (convert-ea1-link (hunchentoot:script-name*)) :preserve-query t :type :permanent))
1055
1056 (define-page view-post-lw2-slug-link (:function #'match-lw2-slug-link) ()
1057   (redirect (convert-lw2-slug-link (hunchentoot:request-uri*)) :type :see-other))
1058
1059 (define-page view-post-lw2-sequence-link (:function #'match-lw2-sequence-link) ()
1060   (redirect (convert-lw2-sequence-link (hunchentoot:request-uri*)) :type :see-other))
1061
1062 (define-page view-feed "/feed" ()
1063   (redirect "/?format=rss" :type :permanent))
1064
1065 (define-page view-allposts "/allPosts" ()
1066   (redirect (format nil "/index~@[?~A~]" (hunchentoot:query-string*)) :type :see-other))
1067
1068 (define-page view-nominations "/nominations" ()
1069   (redirect "/index?view=nominations" :type :see-other))
1070
1071 (define-page view-reviews "/reviews" ()
1072   (redirect "/index?view=reviews" :type :see-other))
1073
1074 (define-page view-review-voting "/reviewVoting" ()
1075   (redirect "https://www.lesswrong.com/reviewVoting" :type :see-other))
1076
1077 (define-page view-coronavirus-link-database "/coronavirus-link-database" ()
1078   (redirect "https://www.lesswrong.com/coronavirus-link-database" :type :see-other))
1079
1080 (defun post-comment (&key need-auth ((:post-id post-id-real)) ((:tag-id tag-id-real)) shortform)
1081   (request-method
1082    (:post (text answer nomination nomination-review af post-id tag-id parent-answer-id parent-comment-id edit-comment-id retract-comment-id unretract-comment-id delete-comment-id)
1083      (let ((lw2-auth-token *current-auth-token*))
1084        (assert lw2-auth-token)
1085        (let* ((post-id (or post-id-real post-id))
1086               (tag-id (or tag-id-real tag-id))
1087               (question (when post-id (cdr (assoc :question (get-post-body post-id :auth-token lw2-auth-token)))))
1088               (new-comment-result
1089                (cond
1090                  (text
1091                   (let ((comment-data
1092                          (list-cond
1093                           (t :body (postprocess-markdown text))
1094                           ((and post-id (not (or edit-comment-id (and shortform (not parent-comment-id))))) :post-id post-id)
1095                           ((and tag-id (not edit-comment-id)) :tag-id tag-id)
1096                           (parent-comment-id :parent-comment-id parent-comment-id)
1097                           (answer :answer t)
1098                           (nomination :nominated-for-review "2020")
1099                           (nomination-review :reviewing-for-review "2020")
1100                           (parent-answer-id :parent-answer-id parent-answer-id)
1101                           (af :af t)
1102                           ((and shortform (not parent-comment-id)) :shortform t))))
1103                     (if edit-comment-id
1104                         (do-lw2-comment-edit lw2-auth-token edit-comment-id comment-data)
1105                         (do-lw2-comment lw2-auth-token comment-data))))
1106                  (retract-comment-id
1107                   (do-lw2-comment-edit lw2-auth-token retract-comment-id '((:retracted . t))))
1108                  (unretract-comment-id
1109                   (do-lw2-comment-edit lw2-auth-token unretract-comment-id '((:retracted . :false))))
1110                  (delete-comment-id
1111                   (do-lw2-comment-remove lw2-auth-token delete-comment-id :reason "Comment deleted by its author.")
1112                   nil))))
1113          (when post-id
1114            (ignore-errors
1115              (get-post-comments post-id :force-revalidate t)
1116              (when question
1117                (get-post-answers post-id :force-revalidate t))))
1118          (when text
1119            (alist-bind ((new-comment-id simple-string :--id)
1120                         (new-comment-html simple-string :html-body))
1121                        new-comment-result
1122                        (mark-comment-replied (alist* :parent-comment-id parent-comment-id :user-id *current-userid* new-comment-result))
1123                        (setf (markdown-source :comment new-comment-id new-comment-html) text)
1124                        (redirect (merge-uris (quri:make-uri :fragment (format nil "comment-~A" new-comment-id)
1125                                                             :query (list-cond (need-auth "need-auth" "y")))
1126                                              (hunchentoot:request-uri*))))))))))
1127
1128 (define-json-endpoint (view-karma-vote-post forum-site "/karma-vote/post")
1129   (let ((auth-token *current-auth-token*))
1130     (request-method
1131      (:get (post-id)
1132        (hash-cond (make-hash-table)
1133          (post-id "Post" (sethash (make-hash-table) post-id (get-post-vote post-id auth-token)))
1134          (post-id "Comment" (get-post-comments-votes post-id auth-token))
1135          (post-id "Tag" (get-post-tag-votes post-id auth-token)))))))
1136
1137 (define-page view-post-lw2-link (:function #'match-lw2-link post-id comment-id * comment-link-type post-type)
1138                                 (need-auth
1139                                  chrono
1140                                  (show-comments :real-name "comments" :type boolean :default t)
1141                                  (format :type string))
1142   (request-method
1143    (:get ()
1144      (when (hunchentoot:get-parameter "commentId")
1145        (redirect (format nil "~A/comment/~A" (generate-item-link :post post-id) comment-id))
1146        (return))
1147      (let* ((lw2-auth-token *current-auth-token*)
1148             (preview (string-equal format "preview"))
1149             (show-comments (and (not preview) show-comments))
1150             (*enable-voting* (not (null (logged-in-userid)))))
1151        (multiple-value-bind (post title condition)
1152            (handler-case (nth-value 0 (get-post-body post-id :auth-token (and need-auth lw2-auth-token)))
1153              (serious-condition (c)
1154                (setf *enable-voting* nil)
1155                (values nil "[missing post]" c))
1156              (:no-error (post)
1157                (values post (cdr (assoc :title post)) nil)))
1158          (let* ((is-event (cdr (assoc :is-event post)))
1159                 (correct-subtype (if is-event "event" "post")))
1160            (when (string/= post-type correct-subtype)
1161              (redirect (generate-item-link :post post :comment-id comment-id :item-subtype correct-subtype))
1162              (return)))
1163          (labels ((extra-head ()
1164                     (when-let (canonical-source (or (and (not comment-id)
1165                                                          (cdr (assoc :canonical-source post)))
1166                                                     (and (always-canonical *current-site*)
1167                                                          (main-site-link *current-site* :post post-id :slug (cdr (assoc :slug post))
1168                                                                          :comment-id comment-id :direct-comment-link t))))
1169                               <link rel="canonical" href=canonical-source>)
1170                     <script>postId=(with-html-stream-output (:stream stream) (json:encode-json post-id stream))</script>
1171                     <script>alignmentForumPost=(if (cdr (assoc :af post)) "true" "false")</script>
1172                     (when (logged-in-userid)
1173                               (call-with-server-data 'process-vote-data (format nil "/karma-vote/post?post-id=~A" post-id))))
1174                   (retrieve-individual-comment (comment-thread-type)
1175                     (let* ((comments (case comment-thread-type
1176                                        (:comment (get-post-comments post-id))
1177                                        (:answer (get-post-answers post-id))))
1178                            (target-comment (find comment-id comments :key (lambda (c) (cdr (assoc :--id c))) :test #'string=)))
1179                       (values comments target-comment))))
1180            (if comment-id
1181                (let ((comment-thread-type (if (string= comment-link-type "answer") :answer :comment)))
1182                  (multiple-value-bind (comments target-comment) (retrieve-individual-comment comment-thread-type)
1183                    (unless target-comment
1184                      ;; If the comment was not found, try as an answer, or vice versa.
1185                      (setf comment-thread-type (if (eq comment-thread-type :comment) :answer :comment)
1186                            (values comments target-comment) (retrieve-individual-comment comment-thread-type))
1187                      (unless target-comment
1188                        (error 'lw2-not-found-error)))
1189                    (let* ((*comment-individual-link* t)
1190                           (display-name (get-username (cdr (assoc :user-id target-comment))))
1191                           (verb-phrase (cond
1192                                          ((and (eq comment-thread-type :answer)
1193                                                (not (cdr (assoc :parent-comment-id target-comment))))
1194                                           "answers")
1195                                          (t "comments on"))))
1196                      (emit-page (out-stream :title (format nil "~A ~A ~A" display-name verb-phrase title)
1197                                             :content-class "individual-thread-page comment-thread-page"
1198                                             :social-description (when-let (x (cdr (assoc :html-body target-comment))) (extract-excerpt x))
1199                                             :extra-head #'extra-head)
1200                                 (unless preview
1201                                   (format out-stream "<h1 class=\"post-title\">~A ~A <a href=\"~A\">~A</a></h1>"
1202                                           (encode-entities display-name)
1203                                           verb-phrase
1204                                           (generate-item-link :post post-id)
1205                                           (clean-text-to-html title :hyphenation nil)))
1206                                 (output-comments out-stream "comment" comments target-comment :chrono chrono :preview preview)))))
1207                (let ((post-sequences (get-post-sequences post-id))
1208                      (debate-responses (when (cdr (assoc :debate post))
1209                                          (get-post-debate-responses post-id))))
1210                  (emit-page (out-stream :title title
1211                                         :content-class (format nil "post-page comment-thread-page~{ ~A~}"
1212                                                                (list-cond ((cdr (assoc :question post)) "question-post-page")
1213                                                                           (post-sequences "in-sequence")
1214                                                                           ((not show-comments) "no-comments")))
1215                                         :social-description (when-let (x (cdr (assoc :html-body post))) (extract-excerpt x))
1216                                         :extra-head #'extra-head)
1217                             (cond
1218                               (condition
1219                                (error-explanation-case (error-to-html condition)
1220                                                        (lw2-not-allowed-error
1221                                                         <p>This probably means the post has been deleted or moved back to the author's drafts.</p>)))
1222                               (t
1223                                (post-body-to-html (acons :debate-responses debate-responses post))))
1224                             (when (and lw2-auth-token (equal (logged-in-userid) (cdr (assoc :user-id post))))
1225                               (format out-stream "<div class=\"post-controls\"><a class=\"edit-post-link button\" href=\"/edit-post?post-id=~A\" accesskey=\"e\" title=\"Edit post [e]\">Edit post</a></div>"
1226                                       (cdr (assoc :--id post))))
1227                             (alist-bind (fm-crosspost foreign-post) post
1228                               (alist-bind (is-crosspost hosted-here) fm-crosspost
1229                                 (when is-crosspost
1230                                   (if-let (crosspost-site-host (backend-magnum-crosspost-site *current-backend*))
1231                                       (let* ((*current-site* (find-site crosspost-site-host))
1232                                              (crosspost-site-title (main-site-title *current-site*)))
1233                                         (alist-bind (comment-count base-score) foreign-post
1234                                           <a class="crosspost" href=(generate-item-link :post foreign-post :absolute t)>Crossposted (if hosted-here "to" "from") (progn crosspost-site-title)
1235                                                                                                                         \ \((safe (pretty-number (or base-score 0) "point")), (safe (pretty-number (or comment-count 0) "comment"))\)</a>))
1236                                       (error "Could not retrieve crossposted post. magnum-crosspost-site not configured.")))))
1237                             (post-nav-links post post-sequences)
1238                             (activate-client-trigger "postLoaded")
1239                             (when show-comments
1240                               (write-string "<script> </script>" out-stream)
1241                               (finish-output out-stream)
1242                               (with-error-html-block ()
1243                                 ;; Temporary hack to support nominations
1244                                 (let* ((real-comments (get-post-comments post-id))
1245                                        (answers (when (cdr (assoc :question post))
1246                                                   (get-post-answers post-id)))
1247                                        (posted-at (and (typep *current-backend* 'backend-lw2)
1248                                                        (cdr (assoc :posted-at post))))
1249                                        (posted-timestamp (and posted-at (local-time:parse-timestring posted-at)))
1250                                        (now (local-time:now))
1251                                        (nominations-open nil)
1252                                        (reviews-eligible (timerange "2020-01-01" posted-timestamp "2021-01-01"))
1253                                        (reviews-open (and reviews-eligible (timerange "2021-12-14" now "2022-01-11"))))
1254                                   (labels ((top-level-property (comment property)
1255                                              (or (cdr (assoc property comment))
1256                                                  (cdr (assoc property (cdr (assoc :top-level-comment comment)))))))
1257                                     (multiple-value-bind (normal-comments nominations reviews)
1258                                         (loop for comment in real-comments
1259                                            if (top-level-property comment :nominated-for-review)
1260                                            collect comment into nominations
1261                                            else if (top-level-property comment :reviewing-for-review)
1262                                            collect comment into reviews
1263                                            else
1264                                            collect comment into normal-comments
1265                                            finally (return (values normal-comments nominations reviews)))
1266                                       (unless (or nominations reviews)
1267                                         (setf normal-comments real-comments)) ;for caching
1268                                       (loop for (name comments open) in (list-cond ((or nominations nominations-open)
1269                                                                                     (list "nomination" nominations nominations-open))
1270                                                                                    ((or reviews reviews-open)
1271                                                                                     (list "review" reviews reviews-open))
1272                                                                                    ((cdr (assoc :question post))
1273                                                                                     (list "answer" answers t))
1274                                                                                    (t
1275                                                                                     (list "comment" normal-comments t)))
1276                                          do (output-comments out-stream name comments nil
1277                                                              :replies-open open
1278                                                              :overcomingbias-sort (cdr (assoc :comment-sort-order post)) :chrono chrono :preview preview))))))))))))))
1279    (:post ()
1280           (post-comment :post-id post-id :need-auth need-auth))))
1281
1282 (defparameter *edit-post-template* (compile-template* "edit-post.html"))
1283
1284 (define-page view-edit-post "/edit-post" (title url section tags post-id link-post)
1285   (request-method
1286     (:get ()
1287      (let* ((csrf-token (make-csrf-token))
1288             (post-body (if post-id (get-post-body post-id :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1289             (section (or section (loop for (sym . sec) in '((:draft . "drafts") (:meta . "meta") (:frontpage-date . "frontpage"))
1290                                        if (cdr (assoc sym post-body)) return sec
1291                                        finally (return "all")))))
1292        (emit-page (out-stream :title (if post-id "Edit Post" "New Post") :content-class "edit-post-page")
1293                   (render-template* *edit-post-template* out-stream
1294                                     :csrf-token csrf-token
1295                                     :title (cdr (assoc :title post-body))
1296                                     :url (cdr (assoc :url post-body))
1297                                     :question (cdr (assoc :question post-body))
1298                                     :tags-supported (typep *current-backend* 'backend-accordius)
1299                                     :tags (when (and post-id (typep *current-backend* 'backend-accordius)) (do-wl-rest-query (format nil "posts/~a/update_tagset/" post-id) '()))
1300                                     :post-id post-id
1301                                     :section-list (loop for (name desc) in '(("all" "All") ("meta" "Meta") ("frontpage" "Frontpage") ("drafts" "Drafts"))
1302                                                      when (or (string= name section) (member name '("drafts" "all") :test #'string=))
1303                                                      collect (alist :name name :desc desc :selected (string= name section)))
1304                                     :lesswrong-misc (typep *current-backend* 'backend-lw2-misc-features)
1305                                     :submit-to-frontpage (if post-id (cdr (assoc :submit-to-frontpage post-body)) t)
1306                                     :markdown-source (or (and post-id (markdown-source :post post-id (cdr (assoc :html-body post-body)))) "")))))
1307     (:post (text question submit-to-frontpage)
1308      (let ((lw2-auth-token *current-auth-token*)
1309            (url (if (string= url "") nil url)))
1310        (assert lw2-auth-token)
1311        (let* ((post-data
1312                (list-cond
1313                 (t :body (postprocess-markdown text))
1314                 (t :title (or (nonempty-string title) "Untitled"))
1315                 (link-post :url url)
1316                 (t :meta (or (string= section "meta") :false))
1317                 ((not post-id) :is-event nil)
1318                 (t :draft (or (string= section "drafts") :false))
1319                 ((typep *current-backend* 'backend-lw2-misc-features) :submit-to-frontpage (and submit-to-frontpage t))
1320                 ((not post-id) :question (if question t :false))))
1321               (post-unset
1322                (list-cond
1323                 ((not link-post) :url t)))
1324               (new-post-data
1325                (if post-id
1326                    (do-lw2-post-edit lw2-auth-token post-id post-data post-unset)
1327                    (do-lw2-post lw2-auth-token post-data)))
1328               (new-post-id (cdr (assoc :--id new-post-data))))
1329          (assert new-post-id)
1330          (when (typep *current-backend* 'backend-accordius)
1331            (do-wl-rest-mutate :post
1332              (format nil "posts/~a/update_tagset/" post-id)
1333              (alist "tags" tags)
1334              lw2-auth-token))
1335          (setf (markdown-source :post new-post-id (cdr (assoc :html-body new-post-data))) text)
1336          (ignore-errors (get-post-body post-id :force-revalidate t))
1337          (redirect (if (js-true (cdr (assoc :draft post-data)))
1338                        (concatenate 'string (generate-item-link :post new-post-data) "?need-auth=y")
1339                        (generate-item-link :post new-post-data))))))))
1340
1341 (define-json-endpoint (view-karma-vote forum-site "/karma-vote")
1342     (let ((auth-token *current-auth-token*))
1343       (request-method
1344        (:post (target target-type (vote-json :real-name "vote"))
1345               (let ((vote (safe-decode-json vote-json)))
1346                 (multiple-value-bind (current-vote result)
1347                     (do-lw2-vote auth-token target-type target vote)
1348                   (alist-bind (vote-count base-score af af-base-score extended-score) result
1349                               (let ((vote-buttons (vote-buttons base-score
1350                                                                 :as-text t
1351                                                                 :af-score (and af af-base-score)
1352                                                                 :vote-count (+ vote-count (if (member (cdr (assoc :karma current-vote)) '(nil "neutral") :test #'equal)
1353                                                                                               0
1354                                                                                               1))
1355                                                                 :extended-score extended-score))
1356                                     (out (make-hash-table)))
1357                                 (loop for (axis . axis-vote) in current-vote
1358                                    do (setf (gethash axis out) (list* axis-vote (gethash axis vote-buttons))))
1359                                 out))))))))
1360
1361 (delete-easy-handler 'view-karma-vote)
1362
1363 (define-json-endpoint (view-user-status login-site "/current-user-status")
1364     (let ((auth-token *current-auth-token*))
1365       (request-method
1366        (:get ()
1367              (if (lw2-graphql-query (graphql-query-string "currentUser" nil '(:--id)) :auth-token auth-token)
1368                  (sethash (make-hash-table)
1369                           "notifications" (check-notifications (logged-in-userid) auth-token)
1370                           "alignmentForumAllowed" (member "alignmentForum" (cdr (assoc :groups (get-user :user-id (logged-in-userid)))) :test #'string=))
1371                  (with-cache-transaction
1372                    (cache-del "auth-token-to-userid" auth-token)
1373                    (cache-del "auth-token-to-username" auth-token)))))))
1374
1375 (hunchentoot:define-easy-handler (view-check-notifications :uri "/check-notifications") (format)
1376   (with-error-page
1377       (setf (hunchentoot:content-type*) "application/json")
1378       (if *current-auth-token*
1379           (let ((notifications-status (check-notifications (logged-in-userid) *current-auth-token* :full (string= format "push"))))
1380             (json:encode-json-to-string notifications-status)))))
1381
1382 (hunchentoot:define-easy-handler (view-ignore-user :uri "/ignore-user") ((csrf-token :request-type :post) (target-id :request-type :post) (state :request-type :post) return)
1383   (with-error-page
1384       (check-csrf-token csrf-token)
1385       (let ((user-id (logged-in-userid)))
1386         (unless user-id (error "Not logged in."))
1387         (with-cache-transaction
1388             (let ((ignore-hash (get-ignore-hash user-id)))
1389               (if (string= state "ignore")
1390                   (setf (gethash target-id ignore-hash) t)
1391                   (remhash target-id ignore-hash))
1392               (cache-put "user-ignore-list" user-id ignore-hash :value-type :json))))
1393       (when return
1394         (redirect return))))
1395
1396 (client-defun comment-controls (&key standalone parent-comment-id parent-answer-id edit-comment-id)
1397   (flet ((inner ()
1398            <form method="post" id="conversation-form" class="aligned-form">
1399              <div class="textarea-container">
1400                <textarea name="text" oninput="enableBeforeUnload();"></textarea>
1401                <span class="markdown-reference-link">You can use <a href="http://commonmark.org/help/" target="_blank">Markdown</a> here.</span>
1402                <button type="button" class="guiedit-mobile-auxiliary-button guiedit-mobile-help-button">Help</button>
1403                <button type="button" class="guiedit-mobile-auxiliary-button guiedit-mobile-exit-button">Exit</button>
1404              </div>
1405              <div>
1406                (macrolet ((hidden-var (name)
1407                             `(when ,name <input type="hidden" name=,(string-downcase name) value=,name>)))
1408                  (hidden-var parent-comment-id)
1409                  (hidden-var parent-answer-id)
1410                  (hidden-var edit-comment-id))
1411                <input name="csrf-token" value=(make-csrf-token) type="hidden">
1412                <input value="Submit" type="submit">
1413              </div>
1414              </form>))
1415     (if standalone
1416         <div class="posting-controls standalone with-markdown-editor" onsubmit="disableBeforeUnload();">(with-html-stream-output (inner))</div>
1417         (inner))))
1418
1419 (define-json-endpoint (view-karma-vote-shortform shortform-site "/karma-vote/shortform")
1420   (let ((auth-token *current-auth-token*))
1421     (request-method
1422      (:get ((offset :type fixnum :default 0))
1423            (sethash (make-hash-table)
1424                     "Comment" (get-shortform-votes auth-token :offset offset))))))
1425
1426 (define-component view-comments-index (index-type)
1427   (:http-args ((offset :type fixnum)
1428                (limit :type fixnum)
1429                (view :member '(nil :alignment-forum))))
1430   (request-method
1431    (:get ()
1432      (let* ((want-total (not (or (typep *current-backend* 'backend-lw2) (typep *current-backend* 'backend-ea-forum)))) ; LW2/EAF can't handle total queries. TODO: handle this in backend.
1433             (shortform (eq index-type :shortform))
1434             (with-voting (not (null (and shortform (logged-in-userid))))))
1435        (multiple-value-bind (title query-view top-nav)
1436            (cond
1437              (shortform (values "Shortform" "shortform" (if (logged-in-userid) (lambda () (comment-controls :standalone t)))))
1438              (t (values (case view (:alignment-forum "Alignment Forum recent comments") (t "Recent comments")) "allRecentComments" nil)))
1439          (multiple-value-bind (recent-comments total last-modified)
1440              (if (or (not (eq index-type :recent-comments)) offset limit view (/= (user-pref :items-per-page) 20))
1441                  (let ((*use-alignment-forum* (eq view :alignment-forum)))
1442                    (lw2-graphql-query (lw2-query-string :comment :list
1443                                                         (remove nil (alist :view query-view
1444                                                                            :limit (or limit (user-pref :items-per-page)) :offset offset)
1445                                                                 :key #'cdr)
1446                                                         :context (if shortform :shortform :index)
1447                                                         :with-total want-total)))
1448                  (get-recent-comments :with-total want-total))
1449            (handle-last-modified last-modified)
1450            (renderer ()
1451              (view-items-index recent-comments
1452                                :title title
1453                                :extra-head (lambda ()
1454                                              (when with-voting
1455                                                (call-with-server-data 'process-vote-data (format nil "/karma-vote/shortform?offset=~A" (or offset 0)))))
1456                                :content-class (if shortform "index-page shortform-index-page comment-thread-page" "index-page comment-index-page")
1457                                :pagination (pagination-nav-bars :offset (or offset 0) :with-next (not want-total) :total (if want-total total))
1458                                :top-nav (lambda () (page-toolbar-to-html :title title) (when top-nav (funcall top-nav)))
1459                                :alternate-html (if (eq index-type :shortform)
1460                                                    (lambda ()
1461                                                      (let ((*enable-voting* with-voting))
1462                                                        <div class="comments">
1463                                                          (comment-tree-to-html *html-output*
1464                                                                                (make-comment-parent-hash
1465                                                                                 (flatten-shortform-comments recent-comments)))
1466                                                        </div>)))))))))
1467    (:post ()
1468      (post-comment :shortform t))))
1469
1470 (define-component-routes forum-site (view-recent-comments (standard-route :uri "/recentcomments") () (view-comments-index :recent-comments)))
1471 (define-component-routes shortform-site (view-shortform (standard-route :uri "/shortform") () (view-comments-index :shortform)))
1472
1473 (delete-easy-handler 'view-recent-comments)
1474
1475 (defun tag-to-html (tag &key skip-headline)
1476   (schema-bind (:tag tag :auto :context :body)
1477     (alist-bind (edited-at html user-id) description
1478       (unless skip-headline
1479         <h1 class="post-title">(safe (clean-text-to-html name))</h1>
1480         <div class="post-meta">
1481           <span>(if core "Core ")(if wiki-only "Wiki" "Tag")</span>
1482           (when (and (nonempty-string edited-at) (nonempty-string user-id))
1483             <span>Last edit: (pretty-time-html edited-at)
1484                   \ by <a class="author" href=("/users/~A" (get-user-slug user-id))>(get-username user-id)</a>
1485             </span>)
1486         </div>)
1487       (when html
1488         <div class="tag-description body-text">(with-html-stream-output (:stream stream) (let ((*memoized-output-stream* stream)) (clean-html* html)))</div>))))
1489
1490 (defun tag-list-to-html (tags)
1491   <ul class="tag-list">
1492     (iter (for tag in tags)
1493           (schema-bind (:tag tag :auto :context :index)
1494                        <li><a class="post-title-link" href=("/tag/~A" slug)>(safe (clean-text-to-html name))(if wiki-only
1495                                                                                                                 " (wiki)"
1496                                                                                                                 (if post-count (format nil " (~A)" post-count)))</a></li>))
1497   </ul>)
1498
1499 (define-json-endpoint (view-user-autocomplete forum-site "/-user-autocomplete")
1500     (request-method
1501      (:get (q)
1502           (lw2-search-query q :indexes '(:users)))))
1503
1504 (define-json-endpoint (view-karma-vote-tag forum-site "/karma-vote/tag")
1505   (let ((auth-token *current-auth-token*))
1506     (request-method
1507      (:get (tag-id post-id)
1508        (hash-cond (make-hash-table)
1509          (tag-id "Post" (get-tag-post-votes tag-id auth-token))
1510          (tag-id "Comment" (get-tag-comments-votes tag-id auth-token))
1511          (post-id "Tag" (get-post-tag-votes post-id auth-token)))))))
1512
1513 (define-component view-tag (slug tail)
1514   (:http-args ((sort :default :relevant :member '(:relevant :new :old))))
1515   (when (nonempty-string tail)
1516     (redirect (format nil "/tag/~A" slug))
1517     (return))
1518   (let ((tag (first (lw2-graphql-query (lw2-query-string :tag :list (alist :view "tagBySlug" :slug slug) :context :body)))))
1519     (unless tag
1520       (error 'lw2-not-found-error))
1521     (request-method
1522      (:get ()
1523        (let* ((posts (get-tag-posts slug))
1524               (posts (if (eq sort :relevant) posts (sort-items posts sort))))
1525          (schema-bind (:tag tag :auto :context :body)
1526            (renderer ()
1527              (view-items-index posts
1528                                :title (format nil "~A tag" name)
1529                                :extra-head (lambda ()
1530                                              (when-let (canonical-source (and (always-canonical *current-site*)
1531                                                                               (main-site-link *current-site* :tag slug)))
1532                                                <link rel="canonical" href=canonical-source>)
1533                                              (when (logged-in-userid)
1534                                                (call-with-server-data 'process-vote-data (format nil "/karma-vote/tag?tag-id=~A" tag-id))))
1535                                :top-nav (lambda ()
1536                                           (page-toolbar-to-html :title name :rss (not wiki-only))
1537                                           (tag-to-html tag)
1538                                           (when (and posts (not *preview*))
1539                                             (sublevel-nav-to-html '(:relevant :new :old)
1540                                                                   sort
1541                                                                   :default :relevant
1542                                                                   :param-name "sort"
1543                                                                   :extra-class "sort")))
1544                                :content-class "index-page tag-index-page"
1545                                :alternate-html (lambda ()
1546                                                  (unless wiki-only
1547                                                    (write-index-items-to-html *html-output* posts))
1548                                                  (when (typep *current-backend* 'backend-lw2-tags-comments)
1549                                                    (finish-output *html-output*)
1550                                                    (let ((*enable-voting* (not (null (logged-in-userid))))
1551                                                          (comments (lw2-graphql-query (lw2-query-string :comment :list (alist :view "tagDiscussionComments" :tag-id tag-id)))))
1552                                                      (output-comments *html-output* "comment" comments nil :replies-open t)))))))))
1553      (:post ()
1554        (schema-bind (:tag tag (tag-id))
1555          (renderer ()
1556            (post-comment :tag-id tag-id)))))))
1557
1558 (define-component-routes forum-site (view-tag (regex-route :regex "^/(?:tag|topics)/([^/?]+)(/[^/?]*)?") (slug tail) (view-tag slug tail)))
1559
1560 (define-route 'ea-forum-viewer-site 'regex-route :name 'view-tags-redirect :regex "^/tag/" :handler (lambda () (redirect (ppcre:regex-replace "^/tag/" (hunchentoot:request-uri*) "/topics/"))))
1561
1562 (define-component view-tags-index ()
1563   (:http-args ())
1564   (multiple-value-bind (all-tags portal)
1565       (lw2-graphql-query-multi
1566        (list (lw2-query-string* :tag :list (alist :view "allTagsAlphabetical"))
1567              (lw2-query-string* :tag :list (alist :view "tagBySlug" :slug "portal") :context :body)))
1568     (let ((core-tags
1569            (iter (for tag in all-tags)
1570                  (schema-bind (:tag tag (core))
1571                               (when core (collect tag)))))
1572           (title (if (typep *current-site* 'lesswrong-viewer-site) "Concepts Portal" "Tags Portal")))
1573       (renderer ()
1574         (emit-page (out-stream :title title)
1575           <article>
1576             <h1 class="post-title">(safe title)</h1>
1577             (tag-to-html (first portal) :skip-headline t)
1578           </article>
1579           (iter (for (title . tags) in (alist "Core Tags" core-tags "All Tags" all-tags))
1580                 (progn
1581                   <h1>(safe title)</h1>
1582                   (tag-list-to-html tags))))))))
1583
1584 (define-component-routes forum-site (view-tags-index (standard-route :uri "/tags") () (view-tags-index)))
1585 (define-component-routes forum-site (view-tags-index-alt (standard-route :uri "/topics") () (view-tags-index)))
1586
1587 (define-route 'forum-site 'standard-route :name 'view-tags-index-redirect :uri "/tags/all" :handler (lambda () (redirect "/tags")))
1588 (define-route 'forum-site 'standard-route :name 'view-tags-index-redirect :uri "/topics/all" :handler (lambda () (redirect "/topics")))
1589
1590 (define-route 'alternate-frontend-site 'standard-route :name 'view-tags-voting-redirect :uri "/tagVoting" :handler (lambda () (main-site-redirect "/tagVoting")))
1591 (define-route 'alternate-frontend-site 'standard-route :name 'view-tags-dashboard-redirect :uri "/tags/dashboard" :handler (lambda () (main-site-redirect "/tags/dashboard")))
1592
1593 (hunchentoot:define-easy-handler (view-push-register :uri "/push/register") ()
1594   (with-error-page
1595       (let* ((data (call-with-safe-json (lambda ()
1596                                           (json:decode-json-from-string
1597                                            (hunchentoot:raw-post-data :force-text t :external-format :utf-8)))))
1598              (subscription (cdr (assoc :subscription data)))
1599              (cancel (cdr (assoc :cancel data))))
1600         (cond
1601           (subscription
1602            (make-subscription *current-auth-token*
1603                               (cdr (assoc :endpoint subscription))
1604                               (cdr (assoc :expires *current-auth-status*)))
1605            (send-notification (cdr (assoc :endpoint subscription)) :ttl 120))
1606           (cancel
1607            (delete-subscription *current-auth-token*)))
1608         nil)))
1609
1610 (hunchentoot:define-easy-handler (view-inbox-redirect :uri "/push/go-inbox") ()
1611   (with-error-page
1612       (redirect (format nil "/users/~A?show=inbox" *current-user-slug*))))
1613
1614 (define-page view-user (:regex "^/users/(.*?)(?:$|\\?)|^/user" user-slug) (id
1615                                                                              (offset :type fixnum :default 0)
1616                                                                              (show :member '(:all :posts :comments :drafts :conversations :inbox) :default :all)
1617                                                                              (sort :member '(:top :new :old) :default :new))
1618              (let* ((auth-token (if (eq show :inbox) *current-auth-token*))
1619                     (user-info
1620                      (let* ((ui (get-user (cond (user-slug :user-slug) (id :user-id)) (or user-slug id) :auth-token auth-token))
1621                             (canonical-slug (cdr (assoc :slug ui))))
1622                        (when (and user-slug
1623                                   canonical-slug
1624                                   (not (string-equal user-slug canonical-slug)))
1625                          (return-from view-user (redirect (format nil "/users/~A" canonical-slug))))
1626                        (if (and (not (cdr (assoc :deleted ui))) (cdr (assoc :--id ui)))
1627                            ui
1628                            (error 'lw2-user-not-found-error))))
1629                     (user-id (cdr (assoc :--id user-info)))
1630                     (own-user-page (logged-in-userid user-id))
1631                     (display-name (if user-slug (cdr (assoc :display-name user-info)) user-id))
1632                     (show-text (if (not (eq show :all)) (string-capitalize show)))
1633                     (title (format nil "~A~@['s ~A~]" display-name show-text))
1634                     (sort-type (case sort (:top :score) (:new :date) (:old :date-reverse))))
1635                (multiple-value-bind (items total last-modified)
1636                  (case show
1637                    (:posts
1638                     (get-user-page-items user-id :posts :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type))
1639                    (:comments
1640                     (get-user-page-items user-id :comments :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type))
1641                    (:drafts
1642                     (get-user-page-items user-id :posts :drafts t :offset offset :limit (+ 1 (user-pref :items-per-page)) :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1643                    (:conversations
1644                      (let ((conversations
1645                              (lw2-graphql-query (lw2-query-string :conversation :list
1646                                                                   (alist :view "userConversations" :limit (+ 1 (user-pref :items-per-page)) :offset offset :user-id user-id)
1647                                                                   :fields '(:--id :created-at :title (:participants :display-name :slug) :----typename))
1648                                                 :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1649                        (lw2-graphql-query-map
1650                          (lambda (c)
1651                            (lw2-query-string* :message :total (alist :view "messagesConversation" :conversation-id (cdr (assoc :--id c)))))
1652                          conversations
1653                          :postprocess (lambda (c result)
1654                                         (acons :messages-total result c))
1655                          :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1656                    (:inbox
1657                     (error-explanation-case
1658                      (prog1
1659                        (let ((notifications (get-notifications :user-id user-id :offset offset :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1660                              (last-check (ignore-errors (local-time:parse-timestring (cdr (assoc :last-notifications-check user-info))))))
1661                          (labels ((check-new (key obj)
1662                                     (if (ignore-errors (local-time:timestamp< last-check (local-time:parse-timestring (cdr (assoc key obj)))))
1663                                         (acons :highlight-new t obj)
1664                                         obj))
1665                                   (check-replied (comment)
1666                                     (let* ((post-id (cdr (assoc :post-id comment)))
1667                                            (comment-id (cdr (assoc :--id comment)))
1668                                            (reply-comment-id (check-comment-replied comment-id user-id)))
1669                                       (if reply-comment-id
1670                                           (acons :replied (list :post post-id :comment-id reply-comment-id) comment)
1671                                           comment))))
1672                            (lw2-graphql-query-map
1673                              (lambda (n)
1674                                (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1675                                                   ("comment"
1676                                                    (lw2-query-string* :comment :single
1677                                                                       (alist :document-id (cdr (assoc :document-id n)))
1678                                                                       :context :index))
1679                                                   ("post"
1680                                                    (lw2-query-string* :post :single (alist :document-id (cdr (assoc :document-id n)))))
1681                                                   ("message"
1682                                                    (lw2-query-string* :message :single (alist :document-id (cdr (assoc :document-id n)))
1683                                                                       :fields *messages-index-fields*))
1684                                                   (t
1685                                                     (values n t))))
1686                              notifications
1687                              :postprocess (lambda (n result)
1688                                             (if result
1689                                                 (funcall (if (string= (cdr (assoc :document-type n)) "comment") #'check-replied #'identity)
1690                                                          (check-new
1691                                                           (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1692                                                                              ("comment" :posted-at)
1693                                                                              ("post" :posted-at)
1694                                                                              ("message" :created-at))
1695                                                           result))
1696                                                 n))
1697                              :auth-token auth-token)))
1698                        (do-user-edit
1699                          (hunchentoot:cookie-in "lw2-auth-token")
1700                          user-id
1701                          (alist :last-notifications-check (timestamp-to-graphql (local-time:now)))))
1702                      (lw2-not-allowed-error
1703                       <p>This may mean your login token has expired or become invalid. You can try <a href="/login">logging in again</a>.</p>)))
1704                    (t
1705                     (get-user-page-items user-id :both :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type)))
1706                  (handle-last-modified last-modified)
1707                  (let ((with-next (> (length items) (+ (if (eq show :all) offset 0) (user-pref :items-per-page))))
1708                        (interleave (if (eq show :all) (comment-post-interleave items :limit (user-pref :items-per-page) :offset (if (eq show :all) offset nil) :sort-by sort-type) (firstn items (user-pref :items-per-page))))) ; this destructively sorts items
1709                    (view-items-index interleave :title title
1710                                      :content-class (format nil "user-page~@[ ~A-user-page~]~:[~; own-user-page~]" (string-downcase show) own-user-page)
1711                                      :current-uri (format nil "/users/~A" user-slug)
1712                                      :section :personal
1713                                      :pagination (pagination-nav-bars :offset offset :total total :with-next (if (not total) with-next))
1714                                      :need-auth (eq show :drafts) :section (if (eq show :drafts) "drafts" nil)
1715                                      :top-nav (lambda ()
1716                                                 (page-toolbar-to-html :title title
1717                                                                       :enable-push-notifications (eq show :inbox)
1718                                                                       :rss (not (member show '(:drafts :conversations :inbox)))
1719                                                                       :new-post (if (eq show :drafts) "drafts" t)
1720                                                                       :new-conversation (if own-user-page t user-slug)
1721                                                                       :ignore (if (and (logged-in-userid) (not own-user-page))
1722                                                                                   (lambda ()
1723                                                                                     (let ((ignored (gethash user-id *current-ignore-hash*)))
1724                                                                                       <form method="post" action="/ignore-user">
1725                                                                                         <button class=("button ~A" (if ignored "unignore-button" "ignore-button"))>(if ignored "Unignore user" "Ignore user")</button>
1726                                                                                         <input type="hidden" name="csrf-token" value=(make-csrf-token)>
1727                                                                                         <input type="hidden" name="target-id" value=user-id>
1728                                                                                         <input type="hidden" name="state" value=(if ignored "unignore" "ignore")>
1729                                                                                         <input type="hidden" name="return" value=(hunchentoot:request-uri*)>
1730                                                                                       </form>)))
1731                                                                       :logout own-user-page)
1732                                                 (alist-bind ((actual-id string :--id)
1733                                                              (actual-slug string :slug)
1734                                                              (karma (or null fixnum))
1735                                                              (af-karma (or null fixnum)))
1736                                                             user-info
1737                                                   <h1 class="page-main-heading"
1738                                                       (when (not own-user-page)
1739                                                         (format nil "data-~:[~;anti-~]~:*kibitzer-redirect=~:[/users/~*~A~;/user?id=~A~]"
1740                                                                 user-slug actual-id actual-slug))>
1741                                                       (progn display-name)
1742                                                       (let ((full-name (get-user-full-name user-id)))
1743                                                         (when (and user-slug (stringp full-name) (> (length full-name) 0))
1744                                                                   <span class="user-full-name">\((progn full-name)\)</span>))
1745                                                   </h1>
1746                                                   <div class="user-stats">
1747                                                     Karma:
1748                                                     <span class="karma-type">
1749                                                       <span class="karma-total">(if user-slug (pretty-number (or karma 0)) "##")</span>(if af-karma " (LW),")
1750                                                     </span>\
1751                                                     (when af-karma
1752                                                       <span class="karma-type">
1753                                                         <span class="karma-total af-karma-total">(if user-slug (pretty-number (or af-karma 0)) "##")</span> \(AF\)
1754                                                       </span>)
1755                                                   </div>
1756                                                   (when-let (html-bio (cdr (assoc :html-bio user-info)))
1757                                                     <div class="user-bio body-text">
1758                                                       (with-html-stream-output (:stream stream)
1759                                                         (let ((*memoized-output-stream* stream))
1760                                                           (clean-html* html-bio)))
1761                                                     </div>))
1762                                                 (sublevel-nav-to-html `(:all :posts :comments
1763                                                                              ,@(if own-user-page
1764                                                                                    '(:drafts :conversations :inbox)))
1765                                                                       show
1766                                                                       :default :all)
1767                                                 (when (member show '(:all :posts :comments))
1768                                                   (sublevel-nav-to-html '(:new :top :old)
1769                                                                         sort
1770                                                                         :default :new
1771                                                                         :param-name "sort"
1772                                                                         :extra-class "sort"))))))))
1773
1774 (defparameter *conversation-template* (compile-template* "conversation.html"))
1775
1776 (define-page view-conversation "/conversation" (id to subject)
1777   (request-method
1778    (:get ()
1779      (cond
1780        ((and id to) (error "This is an invalid URL."))
1781        (id
1782         (multiple-value-bind (conversation messages)
1783             (get-conversation-messages id (hunchentoot:cookie-in "lw2-auth-token"))
1784           (let ((conversation (rectify-conversation conversation)))
1785             (view-items-index (nreverse messages) :content-class "conversation-page" :need-auth t :title (encode-entities (cdr (assoc :title conversation)))
1786                               :top-nav (lambda () (render-template* *conversation-template* *html-output*
1787                                                                     :conversation conversation :csrf-token (make-csrf-token)))))))
1788        (t
1789         (emit-page (out-stream :title "New conversation" :content-class "conversation-page")
1790                    (render-template* *conversation-template* out-stream
1791                                      :to to
1792                                      :subject subject
1793                                      :csrf-token (make-csrf-token))))))
1794    (:post ((text :required t))
1795      (let* ((id (or id
1796                     (let ((participant-ids (list (logged-in-userid) (cdar (lw2-graphql-query (lw2-query-string :user :single (alist :slug to) :fields '(:--id)))))))
1797                       (do-create-conversation (hunchentoot:cookie-in "lw2-auth-token") (alist :participant-ids participant-ids :title subject))))))
1798        (do-create-message (hunchentoot:cookie-in "lw2-auth-token") id text)
1799        (redirect (format nil "/conversation?id=~A" id))))))
1800
1801 (define-page view-search "/search" ((q :required t)
1802                                     (sort :default :relevant :member '(:relevant :new :old)))
1803   (let ((*current-search-query* q)
1804         (link (presentable-link q :search))
1805         (title (format nil "~@[~A - ~]Search" q)))
1806     (declare (special *current-search-query*))
1807     (if link
1808         (redirect link)
1809         (multiple-value-bind (results tags) (lw2-search-query q)
1810           (let* ((sort (if (string= (hunchentoot:get-parameter "format") "rss")
1811                            :new
1812                            sort))
1813                  (results (if (eq sort :relevant)
1814                               results
1815                               (sort-items results sort)))
1816                  (results (if (hunchentoot:get-parameter "format")
1817                               (firstn results 20)
1818                               results)))
1819             (view-items-index results
1820                               :top-nav (lambda ()
1821                                          (page-toolbar-to-html :title title :rss t)
1822                                          (sublevel-nav-to-html '(:relevant :new :old)
1823                                                                sort
1824                                                                :default :relevant
1825                                                                :param-name "sort"
1826                                                                :extra-class "sort")
1827                                          (when tags
1828                                            <h1>Tags</h1>
1829                                            (tag-list-to-html (firstn tags 20))))
1830                               :content-class "index-page search-results-page" :current-uri "/search"
1831                               :title title))))))
1832
1833 (defgeneric view-login (backend))
1834
1835 (defmethod view-login ((backend backend-password-login))
1836   (with-http-args (return cookie-check
1837                       (login-username :request-type :post) (login-password :request-type :post)
1838                       (signup-username :request-type :post) (signup-email :request-type :post) (signup-password :request-type :post) (signup-password2 :request-type :post))
1839     (labels
1840         ((emit-login-page (&key error-message)
1841            (let ((csrf-token (make-csrf-token)))
1842              (emit-page (out-stream :title "Log in" :current-uri "/login" :content-class "login-page" :robots "noindex, nofollow")
1843                (when error-message
1844                  (format out-stream "<div class=\"error-box\">~A</div>" error-message))
1845                (with-outputs (out-stream) "<div class=\"login-container\">")
1846                (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "login-form" "Log in" csrf-token
1847                             '(("login-username" "Username" "text" "username")
1848                               ("login-password" "Password" "password" "current-password"))
1849                             "Log in"
1850                             :end-html (when (typep *current-backend* 'backend-websocket-login) ;other backends not supported yet
1851                                         "<a href=\"/reset-password\">Forgot password</a>"))
1852                (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "signup-form" "Create account" csrf-token
1853                             '(("signup-username" "Username" "text" "username")
1854                               ("signup-email" "Email" "text" "email")
1855                               ("signup-password" "Password" "password" "new-password")
1856                               ("signup-password2" "Confirm password" "password" "new-password"))
1857                             "Create account")
1858                (if-let (main-site-title (main-site-title *current-site*))
1859                        (format out-stream "<div class=\"login-tip\"><span>Tip:</span> You can log in with the same username and password that you use on ~A~:*. Creating an account here also creates one on ~A.</div>"
1860                                main-site-title))
1861                (format out-stream "</div>"))))
1862          (finish-login (username user-id auth-token error-message &optional expires)
1863            (cond
1864              (auth-token
1865               (set-cookie "lw2-auth-token" auth-token :max-age (if expires (+ (- expires (get-unix-time)) (* 24 60 60)) (1- (expt 2 31))))
1866               (if expires (set-cookie "lw2-status" (json:encode-json-to-string (alist :expires expires))))
1867               (cache-put "auth-token-to-userid" auth-token user-id)
1868               (cache-put "auth-token-to-username" auth-token username)
1869               (redirect (if (and return (ppcre:scan "^/[^/]" return)) return "/")))
1870              (t
1871               (emit-login-page :error-message error-message)))))
1872       (cond
1873         ((not (or cookie-check (hunchentoot:cookie-in "session-token")))
1874          (set-cookie "session-token" (base64:usb8-array-to-base64-string (ironclad:make-random-salt)))
1875          (redirect (format nil "/login?~@[return=~A&~]cookie-check=y" (if return (url-rewrite:url-encode return)))))
1876         (cookie-check
1877          (if (hunchentoot:cookie-in "session-token")
1878              (redirect (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))))
1879              (emit-page (out-stream :title "Log in" :current-uri "/login")
1880                         (format out-stream "<h1>Enable cookies</h1><p>Please enable cookies in your browser and <a href=\"/login~@[?return=~A~]\">try again</a>.</p>" (if return (url-rewrite:url-encode return))))))
1881         (login-username
1882          (cond
1883            ((or (string= login-username "") (string= login-password "")) (emit-login-page :error-message "Please enter a username and password"))
1884            ((lw2.dnsbl:dnsbl-check (hunchentoot:real-remote-addr)) (emit-login-page :error-message "Your IP address is blacklisted."))
1885            (t (multiple-value-call #'finish-login login-username (do-login login-username login-password)))))
1886         (signup-username
1887          (cond
1888            ((not (every (lambda (x) (not (string= x ""))) (list signup-username signup-email signup-password signup-password2)))
1889             (emit-login-page :error-message "Please fill in all fields"))
1890            ((not (string= signup-password signup-password2))
1891             (emit-login-page :error-message "Passwords do not match"))
1892            ((lw2.dnsbl:dnsbl-check (hunchentoot:real-remote-addr)) (emit-login-page :error-message "Your IP address is blacklisted."))
1893            (t (multiple-value-call #'finish-login signup-username (do-lw2-create-user signup-username signup-email signup-password)))))
1894         (t
1895          (emit-login-page))))))
1896
1897 (defmethod view-logout ((backend backend-password-login))
1898   (request-method
1899    (:post ()
1900      (set-cookie "lw2-auth-token" "" :max-age 0)
1901      (do-logout *current-auth-token*)
1902      (redirect "/"))))
1903
1904 (defparameter *reset-password-template* (compile-template* "reset-password.html"))
1905
1906 (define-component basic-reset-password ()
1907   (:http-args ((email :request-type :post) (reset-link :request-type :post) (password :request-type :post) (password2 :request-type :post)))
1908   (renderer ()
1909     (labels ((emit-rpw-page (&key message message-type step)
1910                (let ((csrf-token (make-csrf-token)))
1911                  (emit-page (out-stream :title "Reset password" :content-class "reset-password" :robots "noindex, nofollow")
1912                             (render-template* *reset-password-template* out-stream
1913                                               :csrf-token csrf-token
1914                                               :reset-link reset-link
1915                                               :message message
1916                                               :message-type message-type
1917                                               :step step)))))
1918       (cond
1919         (email
1920          (multiple-value-bind (ret error)
1921              (do-lw2-forgot-password email)
1922            (declare (ignore ret))
1923            (if error
1924                (emit-rpw-page :step 1 :message error :message-type "error")
1925                (emit-rpw-page :step 1 :message "Password reset email sent." :message-type "success"))))
1926         (reset-link
1927          (ppcre:register-groups-bind (reset-token) ("(?:reset-password/|^)([^/#]+)$" reset-link)
1928                                      (cond
1929                                        ((not reset-token)
1930                                         (emit-rpw-page :step 2 :message "Invalid password reset link." :message-type "error"))
1931                                        ((not (string= password password2))
1932                                         (emit-rpw-page :step 2 :message "Passwords do not match." :message-type "error"))
1933                                        (t
1934                                         (multiple-value-bind (user-id auth-token error-message) (do-lw2-reset-password reset-token password)
1935                                           (declare (ignore user-id auth-token))
1936                                           (cond
1937                                             (error-message (emit-rpw-page :step 2 :message error-message :message-type "error"))
1938                                             (t
1939                                              (with-error-page (emit-page (out-stream :title "Reset password" :content-class "reset-password")
1940                                                                          (format out-stream "<h1>Password reset complete</h1><p>You can now <a href=\"/login\">log in</a> with your new password.</p>"))))))))))
1941         (t
1942          (emit-rpw-page))))))
1943
1944 (define-route 'login-site 'standard-route :name 'view-login :uri "/login" :handler (lambda () (with-error-page (view-login *current-backend*))))
1945 (define-route 'login-site 'standard-route :name 'view-login-oauth2.0-callback :uri "/auth/callback" :handler (lambda () (with-error-page (view-login-oauth2.0-callback *current-backend*))))
1946
1947 (define-route 'login-site 'standard-route :name 'view-logout :uri "/logout" :handler (lambda () (with-error-page (view-logout *current-backend*))))
1948
1949 (define-component-routes login-site
1950     (basic-reset-password (standard-route :uri "/reset-password") () (basic-reset-password)))
1951
1952 (defun oauth2.0-login-request-uri (backend path &optional query)
1953   (quri:render-uri
1954    (quri:merge-uris
1955     (quri:make-uri :path path :query query)
1956     (quri:uri (oauth2.0-login-uri backend)))))
1957
1958 (defmethod view-login ((backend backend-oauth2.0-login))
1959   (with-http-args (return)
1960     (set-cookie "session-token" (base64:usb8-array-to-base64-string (ironclad:make-random-salt)))
1961     (redirect
1962      (oauth2.0-login-request-uri backend "authorize"
1963                                  (alist "response_type" "code"
1964                                         "client_id" (oauth2.0-client-id backend)
1965                                         "redirect_uri" (quri:render-uri (quri:merge-uris (quri:uri "/auth/callback") (quri:uri (site-uri *current-site*))))
1966                                         "scope" "openid profile email"
1967                                         "state" return)))))
1968
1969 (defmethod view-login-oauth2.0-callback ((backend backend-oauth2.0-login))
1970   (with-http-args (code state)
1971     (let ((auth-response
1972            (call-with-http-response #'json:decode-json
1973                                     (oauth2.0-login-request-uri backend "oauth/token")
1974                                     :method :post
1975                                     :content (alist "grant_type" "authorization_code"
1976                                                     "client_id" (oauth2.0-client-id backend)
1977                                                     "client_secret" (oauth2.0-client-secret backend)
1978                                                     "code" code
1979                                                     "redirect_uri" (quri:render-uri (quri:merge-uris (quri:uri "/auth/callback") (quri:uri (site-uri *current-site*)))))
1980                                     :want-stream t :force-string t)))
1981       (alist-bind ((access-token (or null simple-string) :access--token)
1982                    (error (or null simple-string))
1983                    (error-description (or null simple-string) :error--description))
1984                   auth-response
1985                   (when error
1986                     (error "Login error: ~A" (cdr (assoc :error--description auth-response))))
1987                   (unless access-token
1988                     (error "Login error: server did not provide an access token."))
1989                   (let ((auth-token (do-login-with-oidc-access-token access-token)))
1990                     (alist-bind ((user-id simple-string :--id)
1991                                  (username simple-string :display-name))
1992                                 (do-lw2-post-query
1993                                     auth-token (alist "query"
1994                                                       (graphql-query-string :current-user nil '(:--id :display-name))))
1995                                 (cache-put "auth-token-to-userid" auth-token user-id)
1996                                 (cache-put "auth-token-to-username" auth-token username))
1997                     (set-cookie "lw2-auth-token" auth-token :max-age (1- (expt 2 31)))
1998                     (redirect (if (and state (ppcre:scan "^/[^/]" state)) state "/")))))))
1999
2000 (defmethod view-logout ((backend backend-oauth2.0-login))
2001   (request-method
2002    (:post ()
2003           (set-cookie "lw2-auth-token" "" :max-age 0)
2004           (redirect
2005            (oauth2.0-login-request-uri backend "v2/logout" (alist "client_id" (oauth2.0-client-id backend)))))))
2006
2007 (delete-easy-handler 'view-login)
2008 (delete-easy-handler 'view-logout)
2009 (delete-easy-handler 'view-reset-password)
2010
2011 (define-page view-library "/library"
2012                             ((view :member '(:featured :community) :default :featured))
2013   (let ((sequences
2014          (lw2-graphql-query
2015           (lw2-query-string :sequence :list
2016                             (alist :view (case view
2017                                            (:featured "curatedSequences")
2018                                            (:community "communitySequences")))
2019                             :fields '(:--id :created-at :user-id :title :----typename)))))
2020     (view-items-index
2021      sequences
2022      :title "Sequences Library"
2023      :content-class "sequences-page"
2024      :current-uri "/library"
2025      :top-nav (lambda ()
2026                 (sublevel-nav-to-html '(:featured :community)
2027                                       view
2028                                       :default :featured
2029                                       :param-name "view"
2030                                       :extra-class "sequences-view")))))
2031
2032 (define-page view-sequence (:regex "^/s(?:equences)?/([^/?#]+)(?:/?$|\\?)" sequence-id) ()
2033   (let ((sequence (get-sequence sequence-id)))
2034     (alist-bind ((title string))
2035                 sequence
2036       (emit-page (out-stream
2037                   :title title
2038                   :content-class "sequence-page")
2039                  (sequence-to-html sequence)))))
2040
2041 (define-component view-collection (collection-id) ()
2042                   (let ((collection (get-collection collection-id)))
2043                     (renderer ()
2044                               (emit-page (out-stream :title (cdr (assoc :title collection)) :content-class "sequence-page collection-page")
2045                                          (collection-to-html collection)))))
2046
2047 (define-component-routes lesswrong-viewer-site (view-sequences (standard-route :uri "/sequences") () (view-collection "oneQyj4pw77ynzwAF")))
2048 (define-component-routes lesswrong-viewer-site (view-codex (standard-route :uri "/codex") () (view-collection "2izXHCrmJ684AnZ5X")))
2049 (define-component-routes lesswrong-viewer-site (view-hpmor (standard-route :uri "/hpmor") () (view-collection "ywQvGBSojSQZTMpLh")))
2050 (define-component-routes ea-forum-viewer-site (view-handbook (standard-route :uri "/handbook") () (view-collection "MobebwWs2o86cS9Rd")))
2051
2052 (define-component-routes forum-site (view-tags-index (standard-route :uri "/tags") () (view-tags-index)))
2053
2054 (define-page view-archive (:regex "^/archive(?:/(\\d{4})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))"
2055                            (year :type (mod 10000))
2056                            (month :type (integer 1 12))
2057                            (day :type (integer 1 31)))
2058              ((offset :type fixnum :default 0))
2059   (local-time:with-decoded-timestamp (:day current-day :month current-month :year current-year :timezone local-time:+utc-zone+) (local-time:now)
2060     (local-time:with-decoded-timestamp (:day earliest-day :month earliest-month :year earliest-year :timezone local-time:+utc-zone+) (earliest-post-time)
2061       (labels ((url-elements (&rest url-elements)
2062                  (declare (dynamic-extent url-elements))
2063                  (format nil "/~{~A~^/~}" url-elements))
2064                (archive-nav ()
2065                  (let ((out-stream *html-output*))
2066                    (with-outputs (out-stream) "<div class=\"archive-nav\"><div class=\"archive-nav-years\">")
2067                    (link-if-not out-stream (not (or year month day)) (url-elements "archive") "archive-nav-item-year" "All")
2068                    (loop for y from earliest-year to current-year
2069                       do (link-if-not out-stream (eq y year) (url-elements "archive" y) "archive-nav-item-year" y))
2070                    (format out-stream "</div>")
2071                    (when year
2072                      (format out-stream "<div class=\"archive-nav-months\">")
2073                      (link-if-not out-stream (not month) (url-elements "archive" year) "archive-nav-item-month" "All")
2074                      (loop for m from (if (= (or year current-year) earliest-year) earliest-month 1) to (if (= (or year current-year) current-year) current-month 12)
2075                         do (link-if-not out-stream (eq m month) (url-elements "archive" (or year current-year) m) "archive-nav-item-month" (elt local-time:+short-month-names+ m)))
2076                      (format out-stream "</div>"))
2077                    (when month
2078                      (format out-stream "<div class=\"archive-nav-days\">")
2079                      (link-if-not out-stream (not day) (url-elements "archive" year month) "archive-nav-item-day" "All")
2080                      (loop for d from (if (and (= (or year current-year) earliest-year) (= (or month current-month) earliest-month)) earliest-day 1)
2081                         to (if (and (= (or year current-year) current-year) (= (or month current-month) current-month)) current-day (local-time:days-in-month (or month current-month) (or year current-year)))
2082                         do (link-if-not out-stream (eq d day) (url-elements "archive" (or year current-year) (or month current-month) d) "archive-nav-item-day" d))
2083                      (format out-stream "</div>"))
2084                    (format out-stream "</div>"))))
2085         (multiple-value-bind (posts total)
2086           (lw2-graphql-query (lw2-query-string :post :list
2087                                                (alist :view (if day "new" "top") :limit 51 :offset offset
2088                                                       :after (if (and year (not day)) (format nil "~A-~A-~A" (or year earliest-year) (or month 1) (or day 1)))
2089                                                       :before (if year (format nil "~A-~A-~A" (or year current-year) (or month 12)
2090                                                                                (or day (local-time:days-in-month (or month 12) (or year current-year))))))))
2091           (emit-page (out-stream :title "Archive" :current-uri "/archive" :content-class "archive-page"
2092                                  :top-nav #'archive-nav
2093                                  :pagination (pagination-nav-bars :items-per-page 50 :offset offset :total total :with-next (if total nil (> (length posts) 50))))
2094                      (write-index-items-to-html out-stream (firstn posts 50) :empty-message "No posts for the selected period.")))))))
2095
2096 (define-page view-about "/about" ()
2097   (emit-page (out-stream :title "About" :current-uri "/about" :content-class "about-page")
2098              (alexandria:with-input-from-file (in-stream "www/about.html" :element-type '(unsigned-byte 8))
2099                                               (alexandria:copy-stream in-stream out-stream))))
2100
2101 (define-page misc-pages (:regex "^/misc-pages/.+") ()
2102   (let ((pathname (hunchentoot:request-pathname)))
2103     (unless (probe-file pathname)
2104       (error 'lw2-not-found-error))
2105     (emit-page (out-stream :title "Misc page" :content-class "misc-page")
2106                (alexandria:with-input-from-file (in-stream pathname :element-type '(unsigned-byte 8))
2107                  (alexandria:copy-stream in-stream out-stream)))))
2108
2109 (define-page view-generated-script (:regex "^/generated/([^/]+)\\.js" (name :type string)) ()
2110   (when-let ((package (find-package (string-upcase name))))
2111     (setf (hunchentoot:header-out "Content-Type") "text/javascript")
2112     (let ((stream (make-flexi-stream (hunchentoot:send-headers) :external-format :utf-8)))
2113       (write-package-client-scripts package stream))))
2114
2115 (hunchentoot:define-easy-handler
2116     (view-proxy-asset
2117      :uri (lambda (r)
2118             (with-error-page
2119               (multiple-value-bind (match? strings) (ppcre:scan-to-strings "^/proxy-assets/([0-9A-Za-z]+)(-inverted)?$" (hunchentoot:script-name r) :sharedp t)
2120                 (when-let* ((base-filename (and match? (svref strings 0)))
2121                             (image-data (cache-get "cached-images" base-filename :value-type :json)))
2122                   (let ((inverted (svref strings 1)))
2123                     (alist-bind ((mime-type simple-string)) image-data
2124                       (setf (hunchentoot:header-out "X-Content-Type-Options") "nosniff"
2125                             (hunchentoot:header-out "Cache-Control") #.(format nil "public, max-age=~A, immutable" 600))
2126                       (hunchentoot:handle-static-file (concatenate 'string "www/proxy-assets/" base-filename (if inverted "-inverted" "")) mime-type)
2127                       t)))))))
2128     nil)