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.data-viewers.post
  14         #:lw2.data-viewers.comment
  15         #:lw2.client-script
  16         #:lw2.resources)
  17   (:import-from #:alexandria #:with-gensyms #:once-only #:ensure-list #:when-let #:when-let* #:if-let #:alist-hash-table)
  18   (:import-from #:collectors #:with-collector)
  19   (:import-from #:ppcre #:regex-replace-all)
  20   (:unintern
  21     #:define-regex-handler #:*fonts-stylesheet-uri* #:generate-fonts-link
  22     #:user-nav-bar #:*primary-nav* #:*secondary-nav* #:*nav-bars*
  23     #:begin-html #:end-html
  24     #:*fonts-stylesheet-uris* #:*fonts-redirect-data* #:*fonts-redirect-lock* #:*fonts-redirect-thread*
  25     #:postprocess-conversation-title
  26     #:map-output
  27     #:*earliest-post*
  28     #:*extra-external-scripts* #:*extra-inline-scripts*
  29     #:site-stylesheets #:site-inline-scripts #:site-scripts #:site-external-scripts #:site-head-elements
  30     #:unwrap-stream
  31     #:sort-comments
  32     #:*html-head*
  33     #:with-open-tag)
  34   (:recycle #:lw2-viewer #:lw2.backend))
  35
  36 (in-package #:lw2-viewer)
  37
  38 (named-readtables:in-readtable html-reader)
  39
  40 (add-template-directory (asdf:system-relative-pathname "lw2-viewer" "templates/"))
  41
  42 (define-cache-database 'backend-lw2-legacy
  43     "auth-token-to-userid" "auth-token-to-username" "user-ignore-list")
  44
  45 (defvar *read-only-mode* nil)
  46 (defvar *read-only-default-message* "Due to a system outage, you cannot log in or post at this time.")
  47
  48 (defparameter *default-prefs* (alist :items-per-page 20 :default-sort "new"))
  49 (defvar *current-prefs* nil)
  50
  51 (defun get-post-sequences (post-id)
  52   (when-let (sequence-ids (get-post-sequence-ids post-id))
  53     (with-collector (col)
  54       (dolist (sequence-id sequence-ids)
  55         (let* ((sequence (get-sequence sequence-id))
  56                (posts (sequence-post-ids sequence)))
  57           (multiple-value-bind (prev next)
  58               (loop for prev = nil then (car current)
  59                  for current on posts
  60                  when (string= (car current) post-id)
  61                  return (values prev (second current)))
  62             (when (or prev next)
  63               (col (list sequence
  64                          (and prev (get-sequence-post sequence prev))
  65                          (and next (get-sequence-post sequence next))))))))
  66       (col))))
  67
  68 (defun rectify-post-relations (post-relations)
  69   (remove-if-not (lambda (pr) (cdr (assoc :--id (cdr (first pr))))) post-relations))
  70
  71 (defun post-nav-links (post post-sequences)
  72   <nav class="post-nav-links">
  73     (schema-bind (:post post (target-post-relations source-post-relations) :context :body)
  74       (let ((target-post-relations (rectify-post-relations target-post-relations))
  75             (source-post-relations (rectify-post-relations source-post-relations)))
  76         (when (or target-post-relations source-post-relations)
  77           <div class="related-posts">
  78           (dolist (relations `((,source-post-relations "Parent question")
  79                                (,target-post-relations "Sub-question")))
  80             (destructuring-bind (related-posts relation-type) relations
  81               (when related-posts
  82                 <div class="related-post-group">
  83                   <div class="related-post-type">("~A~A" relation-type (if (second related-posts) "s" ""))</div>
  84                   (dolist (post-relation related-posts)
  85                     (post-headline-to-html (or (cdr (assoc :source-post post-relation))
  86                                                (cdr (assoc :target-post post-relation)))))
  87                 </div>)))
  88           </div>)))
  89     (loop for (sequence prev next) in post-sequences do
  90       (progn
  91         <div class="post-nav-item sequence">
  92           <a class="post-nav sequence-title" href=("/s/~A" (cdr (assoc :--id sequence)))>
  93             <span class="post-nav-label">Part of the sequence:</span>
  94             <span class="post-nav-title">(safe (clean-text-to-html (cdr (assoc :title sequence))))</span>
  95           </a>
  96           (labels ((post-nav-link (direction post)
  97                      <a class=("post-nav ~A" (string-downcase direction)) href=(generate-item-link :post post)>
  98                        <span class="post-nav-label">(case direction (:prev "Previous: ") (:next "Next: "))</span>
  99                        <span class="post-nav-title">(safe (clean-text-to-html (cdr (assoc :title post))))</span>
 100                      </a>))
 101             (when prev (post-nav-link :prev prev))
 102             (when next (post-nav-link :next next)))
 103       </div>))
 104   </nav>)
 105
 106 (defun rectify-conversation (conversation)
 107   (alist-bind ((title (or null string)))
 108               conversation
 109     (if (or (null title) (string= title ""))
 110         (acons :title "[Untitled conversation]" conversation)
 111         conversation)))
 112
 113 (defun conversation-message-to-html (out-stream message)
 114   (alist-bind ((user-id string)
 115                (created-at string)
 116                (highlight-new boolean)
 117                (conversation list)
 118                (content list)
 119                (contents list)
 120                (html-body (or string null)))
 121               message
 122     (let ((conversation (rectify-conversation conversation)))
 123       (multiple-value-bind (pretty-time js-time) (pretty-time created-at)
 124         (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\">"
 125                 (if highlight-new " comment-item-highlight" "")
 126                 (encode-entities (get-user-slug user-id))
 127                 (encode-entities (get-username user-id))
 128                 js-time
 129                 pretty-time
 130                 (pretty-time-js)
 131                 (encode-entities (cdr (assoc :--id conversation)))
 132                 (encode-entities (cdr (assoc :title conversation)))))
 133       (labels ((ws (html-body) (let ((*memoized-output-stream* out-stream)) (clean-html* html-body))))
 134         (cond
 135           (contents (ws (cdr (assoc :html contents))))
 136           (html-body (ws html-body))
 137           (t (format out-stream "~{<p>~A</p>~}" (loop for block in (cdr (assoc :blocks content)) collect (encode-entities (cdr (assoc :text block))))))))
 138       (format out-stream "</div></div>"))))
 139
 140 (defun conversation-index-to-html (out-stream conversation)
 141   (alist-bind ((conversation-id string :--id)
 142                (title (or null string))
 143                (created-at (or null string))
 144                (participants list)
 145                (messages-total fixnum))
 146     (rectify-conversation conversation)
 147     (multiple-value-bind (pretty-time js-time) (if created-at (pretty-time created-at) (values "[Error]" 0))
 148       (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>"
 149               (encode-entities conversation-id)
 150               (encode-entities title)
 151               (loop for p in participants
 152                     collect (list (encode-entities (cdr (assoc :slug p))) (encode-entities (cdr (assoc :display-name p)))))
 153               (pretty-number messages-total "message")
 154               js-time
 155               pretty-time
 156               (pretty-time-js)))))
 157
 158 (defun collection-to-html (collection &optional (heading-level 1))
 159   (alist-bind ((title (or string null))
 160                (subtitle (or string null))
 161                (number (or fixnum null))
 162                (contents list)
 163                (posts list))
 164               collection
 165               (let* ((subcollections (cdr
 166                                       (find-if (lambda (x) (member (car x) '(:books :sequences :chapters) :test #'eq))
 167                                                collection)))
 168                      (html-body (cdr (assoc :html contents))))
 169                 (cond
 170                   ((or html-body title posts)
 171                    <section>
 172                      (when (or html-body title)
 173                        <div class="body-text sequence-text">
 174                          (when title
 175                            (with-html-stream-output (:stream stream)
 176                              (format stream "<h~A class=\"sequence-chapter\">~@[~A. ~]~A</h~A>"
 177                                      heading-level
 178                                      number
 179                                      (clean-text-to-html title)
 180                                      heading-level)))
 181                          (when subtitle
 182                            <div class="sequence-subtitle">(safe (clean-text-to-html subtitle))</div>)
 183                          (when html-body
 184                            (with-html-stream-output (:stream stream)
 185                              (let ((*memoized-output-stream* stream)) (clean-html* html-body))))
 186                          </div>)
 187                      (if posts
 188                          (dolist (post posts)
 189                            (post-headline-to-html post))
 190                          (dolist (subcollection subcollections)
 191                            (collection-to-html subcollection (1+ heading-level))))
 192                    </section>)
 193                   (:otherwise
 194                    (dolist (subcollection subcollections)
 195                      (collection-to-html subcollection heading-level)))))))
 196
 197 (defun sequence-to-html (sequence)
 198   (labels ((contents-to-html (contents &key title subtitle number)
 199              (let ((html-body (cdr (assoc :html contents))))
 200                (when (or html-body title subtitle)
 201                  <div class="body-text sequence-text">
 202                    (when title
 203                      <h1 class="sequence-chapter">(safe (format nil "~@[~A. ~]~A" number (clean-text-to-html title :hyphenation nil)))</h1>)
 204                    (when subtitle
 205                      <div class="sequence-subtitle">(clean-text-to-html subtitle)</div>)
 206                    (with-html-stream-output (:stream stream)
 207                      (when html-body
 208                        (let ((*memoized-output-stream* stream)) (clean-html* html-body))))
 209                  </div>)))
 210            (chapter-to-html (chapter)
 211              (alist-bind ((title (or string null))
 212                            (subtitle (or string null))
 213                            (number (or fixnum null))
 214                            (contents list)
 215                            (posts list))
 216                          chapter
 217                 <section>
 218                   (with-html-stream-output
 219                     (contents-to-html contents :title title :subtitle subtitle :number number)
 220                     <section>
 221                       (with-html-stream-output
 222                           (dolist (post posts)
 223                             (post-headline-to-html post)))
 224                     </section>)
 225                 </section>)))
 226   (alist-bind ((sequence-id string :--id)
 227                (title string)
 228                (created-at string)
 229                (user-id string)
 230                (chapters list)
 231                (contents list))
 232               sequence
 233     (multiple-value-bind (pretty-time js-time) (pretty-time created-at)
 234       <article>
 235         (if chapters
 236           <h1 class="post-title">(safe (clean-text-to-html title :hyphenation nil))</h1>
 237           <h1 class="listing"><a href=("/s/~A" sequence-id)>(safe (clean-text-to-html title :hyphenation nil))</a></h1>)
 238         <div class="post-meta">
 239           <a class=("author~{ ~A~}" (list-cond ((logged-in-userid user-id) "own-user-author")))
 240              href=("/users/~A" (get-user-slug user-id))
 241              data-userid=user-id>
 242             (get-username user-id)
 243           </a>
 244           <div class="date" data-js-date=js-time>
 245             (safe pretty-time)
 246             (safe (pretty-time-js))
 247           </div>
 248         </div>
 249         (with-html-stream-output
 250             (when chapters
 251               (contents-to-html contents)
 252               (dolist (chapter chapters)
 253                 (chapter-to-html chapter))))
 254       </article>))))
 255
 256 (defun abort-response ()
 257   (throw 'abort-response nil))
 258
 259 (defun abort-response-if-unrecoverable (condition)
 260   (when (html-output-stream-error-p condition)
 261     (abort-response)))
 262
 263 (defmacro with-error-html-block (() &body body)
 264   "If an error occurs within BODY, write an HTML representation of the
 265 signaled condition to *HTML-OUTPUT*."
 266   `(block with-error-html-block
 267      (handler-bind ((serious-condition (lambda (c)
 268                                          (abort-response-if-unrecoverable c)
 269                                          (error-to-html c)
 270                                          (return-from with-error-html-block nil))))
 271        (log-conditions (progn ,@body)))))
 272
 273 (defun make-comment-parent-hash (comments)
 274   (let ((existing-comment-hash (make-hash-table :test 'equal))
 275         (hash (make-hash-table :test 'equal)))
 276     (dolist (c comments)
 277       (if-let (id (cdr (assoc :--id c)))
 278               (setf (gethash id existing-comment-hash) t)))
 279     (dolist (c comments)
 280       (let* ((parent-id (cdr (assoc :parent-comment-id c)))
 281              (old (gethash parent-id hash)))
 282         (setf (gethash parent-id hash) (cons c old))
 283         (when (and parent-id (not (gethash parent-id existing-comment-hash)))
 284           (let ((placeholder (alist :--id parent-id :parent-comment-id nil :deleted t)))
 285             (setf (gethash parent-id existing-comment-hash) t
 286                   (gethash nil hash) (cons placeholder (gethash nil hash)))))))
 287     (maphash (lambda (k old)
 288                (setf (gethash k hash) (nreverse old)))
 289              hash)
 290     (labels
 291       ((count-children (parent)
 292         (let ((children (gethash (cdr (assoc :--id parent)) hash)))
 293           (+ (length children) (apply #'+ (map 'list #'count-children children)))))
 294        (add-child-counts (comment-list)
 295         (loop for c in comment-list
 296               as id = (cdr (assoc :--id c))
 297               do (setf (gethash id hash) (add-child-counts (gethash id hash)))
 298               collecting (cons (cons :child-count (count-children c)) c))))
 299       (setf (gethash nil hash) (add-child-counts (gethash nil hash))))
 300     hash))
 301
 302 (defun comment-thread-to-html (out-stream emit-comment-item-fn)
 303   (format out-stream "<ul class=\"comment-thread\">")
 304   (funcall emit-comment-item-fn)
 305   (format out-stream "</ul>"))
 306
 307 (defun comment-item-to-html (out-stream comment &key extra-html-fn with-post-title level level-invert)
 308   (with-error-html-block ()
 309     (let ((c-id (cdr (assoc :--id comment)))
 310           (user-id (cdr (assoc :user-id comment))))
 311       (format out-stream "<li id=\"comment-~A\" class=\"comment-item~{ ~A~}\">"
 312               c-id
 313               (list-cond
 314                (t (if (let ((is-odd (or (not level) (evenp level)))) ;inverted because level counts from 0
 315                         (if level-invert (not is-odd) is-odd))
 316                       "depth-odd" "depth-even"))
 317                ((and *current-ignore-hash* (gethash user-id *current-ignore-hash*)) "ignored")))
 318       (unwind-protect
 319         (comment-to-html out-stream comment :with-post-title with-post-title)
 320         (if extra-html-fn (funcall extra-html-fn c-id))
 321         (format out-stream "</li>")))))
 322
 323 (defun comment-tree-to-html (out-stream comment-hash &key (target nil) (level (if target 1 0)) level-invert)
 324   (let ((comments (gethash target comment-hash)))
 325     (when comments
 326       (comment-thread-to-html out-stream
 327         (lambda ()
 328           (loop for c in comments do
 329                (comment-item-to-html out-stream c
 330                  :level level
 331                  :level-invert level-invert
 332                  :extra-html-fn (lambda (c-id)
 333                                   (if (and (= level 10) (gethash c-id comment-hash))
 334                                       (format out-stream "<input type=\"checkbox\" id=\"expand-~A\"><label for=\"expand-~:*~A\" data-child-count=\"~A comment~:P\">Expand this thread</label>"
 335                                               c-id
 336                                               (cdr (assoc :child-count c))))
 337                                   (comment-tree-to-html out-stream comment-hash :target c-id :level (1+ level) :level-invert level-invert)))))))))
 338
 339 (defun sort-items (items sort-by)
 340   (multiple-value-bind (sort-fn key-fn)
 341       (ecase sort-by
 342         ((:old :new) (values (if (eq sort-by :old)
 343                                  (lambda (a b) (ignore-errors (local-time:timestamp< a b)))
 344                                  (lambda (a b) (ignore-errors (local-time:timestamp> a b))))
 345                              (lambda (c) (ignore-errors (local-time:parse-timestring (or (cdr (assoc :posted-at c))
 346                                                                                          (cdr (assoc :created-at c)))))))))
 347     (sort items sort-fn :key key-fn)))
 348
 349 (defun comment-chrono-to-html (out-stream comments)
 350   (let ((comment-hash (make-comment-parent-hash comments))
 351         (comments (sort-items comments :old)))
 352     (comment-thread-to-html out-stream
 353       (lambda ()
 354         (loop for c in comments do
 355               (let* ((c-id (cdr (assoc :--id c)))
 356                      (new-c (acons :children (gethash c-id comment-hash) c)))
 357                 (comment-item-to-html out-stream new-c)))))))
 358
 359 (defun comment-post-interleave (list &key limit offset (sort-by :date))
 360   (multiple-value-bind (sort-fn sort-key)
 361     (ecase sort-by
 362       (:date (values #'local-time:timestamp> (lambda (x) (local-time:parse-timestring (cdr (assoc :posted-at x))))))
 363       (:date-reverse (values #'local-time:timestamp< (lambda (x) (local-time:parse-timestring (cdr (assoc :posted-at x))))))
 364       (:score (values #'> (lambda (x) (cdr (assoc :base-score x))))))
 365     (let ((sorted (sort list sort-fn :key sort-key)))
 366       (loop for end = (if (or limit offset) (+ (or limit 0) (or offset 0)))
 367             for x in sorted
 368             for count from 0
 369             until (and end (>= count end))
 370             when (or (not offset) (>= count offset))
 371             collect x))))
 372
 373 (defun identify-item (x)
 374   (typecase x
 375     (cons
 376      (if-let (typename (cdr (assoc :----typename x)))
 377              (find-symbol (string-upcase typename) (find-package :keyword))
 378              (cond
 379                ((assoc :message x)
 380                 :notification)
 381                ((assoc :comment-count x)
 382                 :post)
 383                (t
 384                 :comment))))
 385     (condition :condition)))
 386
 387 (defun write-index-items-to-html (out-stream items &key need-auth (empty-message "No entries.") skip-section)
 388   (if items
 389       (dolist (x items)
 390         (with-error-html-block ()
 391           (ecase (identify-item x)
 392             (:condition
 393              (error-to-html x))
 394             (:notification
 395              (format out-stream "<p>~A</p>" (cdr (assoc :message x))))
 396             (:message
 397              (format out-stream "<ul class=\"comment-thread\"><li class=\"comment-item depth-odd\">")
 398              (unwind-protect
 399                   (conversation-message-to-html out-stream x)
 400                (format out-stream "</li></ul>")))
 401             (:conversation
 402              (conversation-index-to-html out-stream x))
 403             (:post
 404              (post-headline-to-html x :need-auth (or need-auth (cdr (assoc :draft x))) :skip-section skip-section))
 405             (:comment
 406              (comment-thread-to-html out-stream
 407                                      (lambda () (comment-item-to-html out-stream x :with-post-title t))))
 408             (:sequence
 409              (sequence-to-html x)))))
 410       (format out-stream "<div class=\"listing-message\">~A</div>" empty-message)))
 411
 412 (defun write-index-items-to-rss (out-stream items &key title need-auth)
 413   (let ((full-title (format nil "~@[~A - ~]~A" title (site-title *current-site*)))
 414         (items (firstn (sort-items items :new) 20)))
 415     (xml-emitter:with-rss2 (out-stream :encoding "UTF-8")
 416       (xml-emitter:rss-channel-header full-title (site-uri *current-site*) :description full-title)
 417       (labels ((emit-item (item &key title link (guid (cdr (assoc :--id item))) (author (get-username (cdr (assoc :user-id item))))
 418                                 (date (pretty-time (cdr (assoc :posted-at item)) :format local-time:+rfc-1123-format+)) body)
 419                           (xml-emitter:rss-item
 420                             title
 421                             :link link
 422                             :author author
 423                             :pubDate date
 424                             :guid guid
 425                             :description body)))
 426         (dolist (item items)
 427           (ecase (identify-item item)
 428             (:post
 429              (let ((author (get-username (cdr (assoc :user-id item))))
 430                    (is-event (cdr (assoc :is-event item))))
 431                (emit-item item
 432                           :title (clean-text (format nil "~A by ~A" (cdr (assoc :title item)) author))
 433                           :author author
 434                           :link (generate-post-auth-link item :absolute t :need-auth need-auth :item-subtype (if is-event "event" "post"))
 435                           :body (clean-html (or (cdr (assoc :html-body (get-post-body (cdr (assoc :--id item)) :revalidate nil))) "") :post-id (cdr (assoc :--id item))))))
 436             (:comment
 437              (schema-bind (:comment item (comment-id post-id user-id html-body))
 438                (when post-id ; XXX fixme
 439                  (emit-item item
 440                             :title (format nil "Comment by ~A on ~A" (get-username user-id) (get-post-title post-id))
 441                             :link (generate-item-link :post post-id :comment-id comment-id :absolute t)
 442                             :body (clean-html html-body)))))))))))
 443
 444 (defun search-bar-to-html (out-stream)
 445   (declare (special *current-search-query*))
 446   (let ((query (and (boundp '*current-search-query*) (hunchentoot:escape-for-html *current-search-query*))))
 447     (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*))))
 448
 449 (defun inbox-to-html (out-stream user-slug &optional new-messages)
 450   (let* ((target-uri (format nil "/users/~A?show=inbox" user-slug))
 451          (as-link (string= (hunchentoot:request-uri*) target-uri)))
 452     (multiple-value-bind (nm-class nm-text)
 453       (if new-messages (values "new-messages" "New messages") (values "no-messages" "Inbox"))
 454       (format out-stream "<~:[a href=\"~A\"~;span~*~] id=\"inbox-indicator\" class=\"~A\" accesskey=\"o\" title=\"~A~:[ [o]~;~]\">~A</a>"
 455               as-link target-uri nm-class nm-text as-link nm-text))))
 456
 457 (defmethod site-nav-bars ((site site))
 458   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 459                      ("about" "/about" "About" :accesskey "t")
 460                      ("search" "/search" "Search" :html search-bar-to-html)
 461                      user-nav-item))
 462     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 463                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 464
 465 (defmethod site-nav-bars ((site lesswrong-viewer-site))
 466   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 467                      ("sequences" "/library" "Sequences" :description "Sequences" :accesskey "q")
 468                      ("about" "/about" "About" :accesskey "t")
 469                      ("search" "/search" "Search" :html search-bar-to-html)
 470                      user-nav-item))
 471     (:tertiary-bar (("questions" "/index?view=questions" "Questions")
 472                     ("events" "/index?view=events" "Events")
 473                     ("shortform" "/shortform" "Shortform" :description "Latest Shortform posts")
 474                     ("alignment-forum" "/index?view=alignment-forum" "Alignment Forum")
 475                     ("alignment-forum-comments" "/recentcomments?view=alignment-forum" "AF Comments")))
 476     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 477                    ("featured" "/index?view=featured" "Featured" :description "Latest featured posts" :accesskey "f")
 478                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 479                    ("tags" "/tags" "Tags" :description "All tags" :accesskey "v")
 480                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 481
 482 (defmethod site-nav-bars ((site ea-forum-viewer-site))
 483   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 484                      ("about" "/about" "About" :accesskey "t")
 485                      ("search" "/search" "Search" :html search-bar-to-html)
 486                      user-nav-item))
 487     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 488                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 489                    ("tags" "/tags" "Wiki" :description "Wiki pages and tags" :accesskey "v")
 490                    ("shortform" "/shortform" "Shortform" :description "Latest Shortform posts")
 491                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 492
 493 (defun prepare-nav-bar (nav-bar current-uri)
 494   (list (first nav-bar)
 495         (map 'list (lambda (item) (if (listp item) item (funcall item current-uri)))
 496              (second nav-bar))))
 497
 498 (defun nav-item-active (item current-uri)
 499   (when item
 500     (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 501       (declare (ignore id name description html accesskey nofollow trailing-html))
 502       (string= (or override-uri uri) current-uri))))
 503
 504 (defun nav-bar-active (nav-bar current-uri)
 505   (some (lambda (x) (nav-item-active x current-uri)) (second nav-bar)))
 506
 507 (defun nav-bar-inner (out-stream items &optional current-uri)
 508   (maplist (lambda (items)
 509              (let ((item (first items)))
 510                (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 511                  (declare (ignore override-uri))
 512                  (let* ((item-active (nav-item-active item current-uri))
 513                         (nav-class (format nil "nav-item ~:[nav-inactive~;nav-current~]~:[~; nav-item-last-before-current~]"
 514                                            item-active (and (not item-active) (nav-item-active (cadr items) current-uri)))))
 515                      (format out-stream "<span id=\"nav-item-~A\" class=\"~A\" ~@[title=\"~A\"~]>"
 516                              id nav-class description)
 517                      (if html
 518                          (funcall html out-stream)
 519                          (link-if-not out-stream item-active uri "nav-inner" name :accesskey accesskey :nofollow nofollow))
 520                      (if trailing-html
 521                          (funcall trailing-html out-stream))
 522                      (format out-stream "</span>")))))
 523            items))
 524
 525 (defun nav-bar-outer (out-stream class nav-bar &optional current-uri)
 526   (format out-stream "<nav id=\"~A\" class=\"nav-bar~@[ ~A~]\">" (string-downcase (first nav-bar)) class)
 527   (nav-bar-inner out-stream (second nav-bar) current-uri)
 528   (format out-stream "</nav>"))
 529
 530 (defun nav-bar-to-html (out-stream class current-uri)
 531   (let* ((nav-bars (map 'list (lambda (x) (prepare-nav-bar x current-uri)) (site-nav-bars *current-site*)))
 532          (active-bar (or (find-if (lambda (x) (nav-bar-active x current-uri)) nav-bars) (car (last nav-bars))))
 533          (inactive-bars (remove active-bar nav-bars)))
 534     (dolist (bar inactive-bars)
 535       (nav-bar-outer out-stream (format nil "~@[~A ~]inactive-bar" class) bar current-uri))
 536     (nav-bar-outer out-stream (format nil "~@[~A ~]active-bar" class) active-bar current-uri)))
 537
 538 (defun user-nav-item (&optional current-uri)
 539   (if *read-only-mode*
 540       `("login" "/login" "Read Only Mode" :html ,(lambda (out-stream)
 541                                                          (format out-stream "<span class=\"nav-inner\" title=\"~A\">[Read Only Mode]</span>"
 542                                                                  (typecase *read-only-mode*
 543                                                                    (string *read-only-mode*)
 544                                                                    (t *read-only-default-message*)))))
 545       (if-let (username (logged-in-username))
 546               (let ((user-slug (encode-entities (logged-in-user-slug))))
 547                 `("login" ,(format nil "/users/~A" user-slug) ,(plump:encode-entities username) :description "User page" :accesskey "u"
 548                           :trailing-html ,(lambda (out-stream) (inbox-to-html out-stream user-slug))))
 549               `("login" "/login" "Log In"
 550                         :html ,(lambda (out-stream)
 551                                  (write-string "<form action='/login' id='login-button-form'><input type='hidden' name='return' value='" out-stream)
 552                                  (encode-entities current-uri out-stream)
 553                                  (write-string "'></form><button class='nav-inner' form='login-button-form' accesskey='u'>Log In</button>" out-stream))))))
 554
 555 (defun sublevel-nav-to-html (options current &key default (base-uri (hunchentoot:request-uri*)) (param-name "show") (remove-params '("offset")) extra-class)
 556   (declare (type (or null string) extra-class))
 557   (let ((out-stream *html-output*))
 558     (format out-stream "<nav class=\"sublevel-nav~@[ ~A~]\">" extra-class)
 559     (loop for item in options
 560        do (destructuring-bind (param-value &key (text (string-capitalize param-value)) description) (if (atom item) (list item) item)
 561             (let* ((param-value (string-downcase param-value))
 562                    (selected (string-equal current param-value))
 563                    (class (if selected "sublevel-item selected" "sublevel-item")))
 564               (link-if-not out-stream selected (apply #'replace-query-params base-uri param-name (unless (string-equal param-value default) param-value)
 565                                                       (loop for x in remove-params nconc (list x nil)))
 566                            class text :title description))))
 567     (format out-stream "</nav>")))
 568
 569 (defmacro set-script-variables (&rest clauses)
 570   (with-gensyms (out-stream name value)
 571     `(with-html-stream-output (:stream ,out-stream)
 572        ,.(loop for clause in clauses
 573             collect (destructuring-bind (name-form value-form) clause
 574                       `(let ((,name ,name-form)
 575                              (,value ,value-form))
 576                          (declare (dynamic-extent ,name ,value))
 577                          (write-string ,name ,out-stream)
 578                          (write-string "=" ,out-stream)
 579                          (json:encode-json ,value ,out-stream)
 580                          (write-string #.(format nil ";~%") ,out-stream)))))))
 581
 582 (defun html-body (out-stream fn &key title description social-description current-uri content-class robots extra-head)
 583   (macrolet ((for-resource-type ((resource-type &rest args) &body body)
 584                (with-gensyms (resource)
 585                  `(dolist (,resource page-resources)
 586                     (when (eq (first ,resource) ,resource-type)
 587                       (destructuring-bind ,args (rest ,resource)
 588                         ,@body))))))
 589     (with-html-stream-output
 590         (let* ((session-token (hunchentoot:cookie-in "session-token"))
 591                (csrf-token (and session-token (make-csrf-token session-token)))
 592                (hide-nav-bars (truthy-string-p (hunchentoot:get-parameter "hide-nav-bars")))
 593                (preview *preview*)
 594                (page-resources (nreverse *page-resources*))
 595                (site-domain (site-domain *current-site*)))
 596           (setf *page-resources* nil)
 597           (write-string "<!DOCTYPE html><html lang=\"en-US\"><head>
 598 <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
 599 <meta name=\"HandheldFriendly\" content=\"True\" />"
 600                         out-stream)
 601           (with-delimited-writer (out-stream delimit :begin "<script>" :end "</script>")
 602             (when site-domain
 603               (delimit)
 604               (set-script-variables ("document.domain" site-domain))) ; Requires origin-agent-cluster header, see below
 605             (unless preview
 606               (delimit)
 607               (when (typep *current-site* 'login-site)
 608                 (set-script-variables
 609                  ("loggedInUserId" (or (logged-in-userid) ""))
 610                  ("loggedInUserDisplayName" (or (logged-in-username) ""))
 611                  ("loggedInUserSlug" (or (logged-in-user-slug) ""))))
 612               (set-script-variables
 613                ("applicationServerKey" (get-vapid-public-key))
 614                ("GW" (alist "useFancyFeatures" (not (typep *current-site* 'arbital-site))
 615                             "secureCookies" (to-boolean (site-secure *current-site*))
 616                             "csrfToken" csrf-token
 617                             "assets" (alist "popup.svg" (generate-versioned-link "/assets/popup.svg"))
 618                             "sites" (if site-domain
 619                                         (loop for site in *sites*
 620                                            when (let ((sd (site-domain site))) (and sd (string-equal sd site-domain)))
 621                                            collect (cons (site-host site) t))
 622                                         (alist (site-host *current-site*) t)))))
 623               (for-resource-type (:inline-script script-text)
 624                                  (write-string ";" out-stream)
 625                                  (write-string script-text out-stream))))
 626           (unless preview
 627             (funcall lw2.resources::*script-tags* out-stream)
 628             (for-resource-type (:script uri)
 629                                (format out-stream "<script src=\"~A\"></script>" uri))
 630             (funcall lw2.resources::*async-script-tags* out-stream)
 631             (for-resource-type (:async-script uri)
 632                                (format out-stream "<script src=\"~A\" async></script>" uri)))
 633           (funcall lw2.resources::*style-tags* out-stream)
 634           (for-resource-type (:stylesheet uri &key media class)
 635                              (format out-stream "<link rel=\"stylesheet\" href=\"~A\"~@[ media=\"~A\"~]~@[ class=\"~A\"~]>" uri media class))
 636           (generate-fonts-html-headers (site-fonts-source *current-site*))
 637           (format out-stream "<link rel=\"shortcut icon\" href=\"~A\">"
 638                   (generate-versioned-link "/assets/favicon.ico"))
 639           (format out-stream "<title>~@[~A - ~]~A</title>~@[<meta name=\"description\" content=\"~A\">~]~@[<meta name=\"robots\" content=\"~A\">~]"
 640                   (if title (encode-entities title))
 641                   (site-title *current-site*)
 642                   description
 643                   robots)
 644           (unless preview
 645             (when title
 646               <meta property="og:title" content=title>)
 647             (when social-description
 648               <meta property="og:description" content=social-description>
 649               <meta property="og:type" content="article">))
 650           (with-delimited-writer (out-stream delimit :begin "<style>" :between #.(format nil "~%") :end "</style>")
 651             (unless (and (typep *current-site* 'login-site) (logged-in-userid))
 652               (delimit)
 653               (write-string "button.vote { display: none }" out-stream))
 654             (when *memoized-output-without-hyphens*
 655               ;; The browser has been detected as having bugs related to soft-hyphen characters.
 656               ;; But there is some hope that it could still do hyphenation by itself.
 657               (delimit)
 658               (write-string ".body-text { hyphens: auto; -ms-hyphens: auto; -webkit-hyphens: auto; }" out-stream)))
 659           (when preview
 660             (format out-stream "<base target='_top'>"))
 661           (when extra-head (funcall extra-head))
 662           (format out-stream "</head>")
 663           (unwind-protect
 664                (progn
 665                  (format out-stream "<body class=\"theme-~A\"><div id=\"content\"~@[ class=\"~{~A~^ ~}\"~]>"
 666                          (let ((theme (hunchentoot:cookie-in "theme")))
 667                            (if (and theme (> (length theme) 0))
 668                                theme
 669                                "default"))
 670                          (list-cond (content-class content-class)
 671                                     (hide-nav-bars "no-nav-bars")
 672                                     (preview "preview")))
 673                  (unless (or hide-nav-bars preview)
 674                    (nav-bar-to-html out-stream "nav-bar-top" (or current-uri (replace-query-params (hunchentoot:request-uri*) "offset" nil "sort" nil)))
 675                    (when (and (typep *current-site* 'login-site) (logged-in-userid))
 676                      (call-with-server-data 'process-user-status "/current-user-status")))
 677                  (activate-client-trigger "navBarLoaded")
 678                  (funcall fn))
 679             (format out-stream "</div></body></html>"))))))
 680
 681 (defun replace-query-params (uri &rest params)
 682   (let* ((quri (quri:uri uri))
 683          (old-params (quri:uri-query-params quri))
 684          (new-params (loop with out = old-params
 685                            for (param value) on params by #'cddr
 686                            do (if value
 687                                   (if-let (old-cons (assoc param out :test #'equal))
 688                                           (setf (cdr old-cons) value)
 689                                           (setf out (nconc out (list (cons param value)))))
 690                                   (setf out (remove-if (lambda (x) (equal (car x) param)) out)))
 691                            finally (return out))))
 692     (if new-params
 693       (setf (quri:uri-query-params quri) new-params)
 694       (setf (quri:uri-query quri) nil))
 695     (quri:render-uri quri)))
 696
 697 (defun pagination-nav-bars (&key offset total with-next (items-per-page (user-pref :items-per-page)))
 698   (if *preview*
 699       (lambda (out-stream fn)
 700         (declare (ignore out-stream))
 701         (funcall fn))
 702       (lambda (out-stream fn)
 703         (labels ((pages-to-end (n) (< (+ offset (* items-per-page n)) total)))
 704           (let* ((with-next (if total (pages-to-end 1) with-next))
 705                  (next (if (and offset with-next) (+ offset items-per-page)))
 706                  (prev (if (and offset (>= offset items-per-page)) (- offset items-per-page)))
 707                  (request-uri (hunchentoot:request-uri*))
 708                  (first-uri (if (and prev (> prev 0)) (replace-query-params request-uri "offset" nil)))
 709                  (prev-uri (if prev (replace-query-params request-uri "offset" (if (= prev 0) nil prev))))
 710                  (next-uri (if next (replace-query-params request-uri "offset" next)))
 711                  (last-uri (if (and total offset (pages-to-end 2))
 712                                (replace-query-params request-uri "offset" (- total (mod (- total 1) items-per-page) 1)))))
 713             (if (or next prev last-uri)
 714                 (labels ((write-item (uri class title accesskey)
 715                            (format out-stream "<a href=\"~A\" class=\"button nav-item-~A~:[ disabled~;~]\" title=\"~A [~A]\" accesskey=\"~A\"></a>"
 716                                    (or uri "#") class uri title accesskey accesskey)))
 717                   (format out-stream "<nav id='top-nav-bar'>")
 718                   (write-item first-uri "first" "First page" "\\")
 719                   (write-item prev-uri "prev" "Previous page" "[")
 720                   (format out-stream "<span class='page-number'><span class='page-number-label'>Page</span> ~A</span>" (+ 1 (/ (or offset 0) items-per-page)))
 721                   (write-item next-uri "next" "Next page" "]")
 722                   (write-item last-uri "last" "Last page" "/")
 723                   (format out-stream "</nav>")))
 724             (funcall fn)
 725             (nav-bar-outer out-stream nil (list :bottom-bar
 726                                                 (list-cond
 727                                                  (first-uri `("first" ,first-uri "Back to first"))
 728                                                  (prev-uri `("prev" ,prev-uri "Previous" :nofollow t))
 729                                                  (t `("top" "#top" "Back to top"))
 730                                                  (next-uri `("next" ,next-uri "Next" :nofollow t))
 731                                                  (last-uri `("last" ,last-uri "Last" :nofollow t)))))
 732             (format out-stream "<script>document.querySelectorAll('#bottom-bar').forEach(bb => { bb.classList.add('decorative'); });</script>"))))))
 733
 734 (defun decode-json-as-hash-table (json-source)
 735   (let (current-hash-table current-key)
 736     (declare (special current-hash-table current-key))
 737     (json:bind-custom-vars
 738      (:beginning-of-object (lambda () (setf current-hash-table (make-hash-table :test 'equal)))
 739       :object-key (lambda (x) (setf current-key x))
 740       :object-value (lambda (x) (setf (gethash current-key current-hash-table) x))
 741       :end-of-object (lambda () current-hash-table)
 742       :aggregate-scope '(current-hash-table current-key))
 743      (json:decode-json-from-source json-source))))
 744
 745 (defun get-ignore-hash (&optional (user-id (logged-in-userid)))
 746   (if-let (ignore-json (and user-id (cache-get "user-ignore-list" user-id)))
 747           (decode-json-as-hash-table ignore-json)
 748           (make-hash-table :test 'equal)))
 749
 750 (defmacro with-outputs ((out-stream) &body body)
 751   (with-gensyms (stream-sym)
 752     (let ((out-body (map 'list (lambda (x) `(princ ,x ,stream-sym)) body)))
 753       `(let ((,stream-sym ,out-stream))
 754          ,.out-body))))
 755
 756 (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)
 757   (declare (ignore return-code))
 758   (ignore-errors
 759     (log-conditions
 760       (html-body out-stream
 761                  (lambda ()
 762                    (when top-nav (funcall top-nav))
 763                    (funcall pagination out-stream fn))
 764                  :title title :description description :social-description social-description :current-uri current-uri :content-class content-class :robots robots :extra-head extra-head))))
 765
 766 (defun set-cookie (key value &key (max-age (- (expt 2 31) 1)) (path "/"))
 767   (hunchentoot:set-cookie key :value value :path path :max-age max-age :secure (site-secure *current-site*)))
 768
 769 (defun set-default-headers (return-code)
 770   (setf (hunchentoot:content-type*) "text/html; charset=utf-8"
 771         (hunchentoot:return-code*) return-code
 772         (hunchentoot:header-out :link) (let ((output
 773                                               (with-output-to-string (stream)
 774                                                 (with-delimited-writer (stream delimit :between ",")
 775                                                   (funcall lw2.resources::*link-header* stream delimit)))))
 776                                          (when (> (length output) 0)
 777                                            output)))
 778   (unless lw2.resources::*push-option* (set-cookie "push" "t" :max-age (* 4 60 60))))
 779
 780 (defun user-pref (key)
 781   (or (cdr (assoc key *current-prefs*))
 782       (cdr (assoc key *default-prefs*))))
 783
 784 (defun set-user-pref (key value)
 785   (assert (boundp 'hunchentoot:*reply*))
 786   (if value
 787       (setf *current-prefs* (remove-duplicates (acons key value *current-prefs*) :key #'car :from-end t))
 788       (setf *current-prefs* (remove key *current-prefs* :key #'car)))
 789   (set-cookie "prefs" (quri:url-encode (json:encode-json-to-string *current-prefs*))))
 790
 791 (defmacro emit-page ((out-stream &rest args &key (return-code 200) &allow-other-keys) &body body)
 792   (once-only (return-code)
 793     `(progn
 794        (set-default-headers ,return-code)
 795        (with-response-stream (,out-stream)
 796          (dynamic-flet ((fn () ,@body))
 797            (call-with-emit-page ,out-stream
 798                                 #'fn
 799                                 ,@args))))))
 800
 801 (defmethod call-with-backend-context ((backend backend-token-login) (request (eql t)) fn)
 802   (let ((*current-auth-status* (safe-decode-json (hunchentoot:cookie-in "lw2-status"))))
 803     (multiple-value-bind (*current-auth-token* *current-userid* *current-username*)
 804         (let* ((auth-token (hunchentoot:cookie-in "lw2-auth-token"))
 805                (expires (cdr (assoc :expires *current-auth-status*))))
 806           (when (and (nonempty-string auth-token)
 807                      (not *read-only-mode*)
 808                      (or (null expires)
 809                          (and (integerp expires) (<= (get-unix-time) (- expires (* 60 60 24))))))
 810             (with-cache-readonly-transaction
 811                 (values
 812                  auth-token
 813                  (cache-get "auth-token-to-userid" auth-token)
 814                  (cache-get "auth-token-to-username" auth-token)))))
 815       (let ((*current-user-slug* (and *current-userid* (get-user-slug *current-userid*))))
 816         (funcall fn)))))
 817
 818 (defmethod call-with-site-context ((site ignore-list-site) (request (eql t)) fn)
 819   (call-next-method
 820    site request
 821    (lambda ()
 822      (let ((*current-ignore-hash* (get-ignore-hash)))
 823        (funcall fn)))))
 824
 825 (defun call-with-error-page (fn)
 826   (with-response-context ()
 827     (let* ((*current-prefs* (safe-decode-json (hunchentoot:cookie-in "prefs")))
 828            (*preview* (string-equal (hunchentoot:get-parameter "format") "preview")))
 829       (multiple-value-bind (*revalidate-default* *force-revalidate-default*)
 830           (cond ((ppcre:scan "(?:^|,?)\\s*(?:no-cache|max-age=0)(?:$|,)" (hunchentoot:header-in* :cache-control))
 831                  (values t t))
 832                 (*preview*
 833                  (values nil nil))
 834                 (t
 835                  (values t nil)))
 836         (when (not *revalidate-default*)
 837           (setf (hunchentoot:header-out :cache-control) (format nil "public, max-age=~A" (* 5 60))))
 838         (when (site-domain *current-site*)
 839           (setf (hunchentoot:header-out :origin-agent-cluster) "?0")) ; Allow document.domain in Chrome: https://developer.chrome.com/blog/immutable-document-domain/
 840         (let ((*memoized-output-without-hyphens*
 841                ;; Soft hyphen characters mess up middle-click paste and screen readers, so try to identify whether they are necessary.
 842                ;; See https://caniuse.com/?search=hyphens
 843                (if-let ((ua (hunchentoot:header-in* :user-agent)))
 844                        (regex-case ua
 845                                    (" Chrome/(\\d+)"
 846                                     (declare (regex-groups-min 1))
 847                                     (or (> (parse-integer (reg 0)) 87)
 848                                         (ppcre:scan "Macintosh|Android" ua)))
 849                                    (" Edge/(\\d+)"
 850                                     (declare (regex-groups-min 1))
 851                                     (> 19 (parse-integer (reg 0))))
 852                                    (t t))
 853                        t)))
 854           (with-page-resources
 855               (catch 'abort-response
 856                 (handler-bind
 857                     ((fatal-error (lambda (condition)
 858                                     (abort-response-if-unrecoverable condition)
 859                                     (let ((error-html (with-output-to-string (*html-output*) (error-to-html condition))))
 860                                       (emit-page (out-stream :title "Error" :return-code (condition-http-return-code condition) :content-class "error-page")
 861                                                  (write-string error-html out-stream)
 862                                                  (when (eq (hunchentoot:request-method*) :post)
 863                                                    <form method="post" class="error-retry-form">
 864                                                    (loop for (key . value) in (hunchentoot:post-parameters*)
 865                                                       do <input type="hidden" name=key value=value>)
 866                                                    <input type="submit" value="Retry">
 867                                                    </form>))
 868                                       (return-from call-with-error-page)))))
 869                   (log-conditions
 870                    (if (or (eq (hunchentoot:request-method*) :post)
 871                            (not (and (boundp '*test-acceptor*) (boundp '*hunchentoot-taskmaster*)))) ; TODO fix this hack
 872                        (funcall fn)
 873                        (sb-sys:with-deadline (:seconds (expt 1.3
 874                                                              (min (round (log 30 1.3))
 875                                                                   (- (hunchentoot:taskmaster-max-thread-count (symbol-value '*hunchentoot-taskmaster*))
 876                                                                      (hunchentoot:acceptor-requests-in-progress (symbol-value '*test-acceptor*))))))
 877                          (funcall fn))))))))))))
 878
 879 (defmacro with-error-page (&body body)
 880   `(dynamic-flet ((fn () ,@body)) (call-with-error-page #'fn)))
 881
 882 (defun output-form (out-stream method action id heading csrf-token fields button-label &key textarea end-html)
 883   (format out-stream "<form method=\"~A\" action=\"~A\" id=\"~A\"><h1>~A</h1>" method action id heading)
 884   (loop for (id label type . params) in fields
 885         do (format out-stream "<label for=\"~A\">~A:</label>" id label)
 886         do (cond
 887              ((string= type "select")
 888               (destructuring-bind (option-list &optional default) params
 889                 (format out-stream "<select name=\"~A\">" id)
 890                 (loop for (value label) in option-list
 891                       do (format out-stream "<option value=\"~A\"~:[~; selected~]>~A</option>" value (string= default value) label))
 892                 (format out-stream "</select>")))
 893              (t
 894                (destructuring-bind (&optional (autocomplete "off") default) params
 895                  (format out-stream "<input type=\"~A\" name=\"~A\" autocomplete=\"~A\"~@[ value=\"~A\"~]>" type id autocomplete (and default (encode-entities default))))))
 896         do (format out-stream ""))
 897   (if textarea
 898     (destructuring-bind (ta-name ta-contents) textarea
 899       (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))))
 900   (format out-stream "<input type=\"hidden\" name=\"csrf-token\" value=\"~A\"><input type=\"submit\" value=\"~A\">~@[~A~]</form>"
 901           csrf-token button-label end-html))
 902
 903 (defun page-toolbar-to-html (&key title new-post new-conversation logout (rss t) ignore enable-push-notifications)
 904   (unless *preview*
 905     (let ((out-stream *html-output*)
 906           (liu (logged-in-userid)))
 907       (format out-stream "<div class=\"page-toolbar~@[ hide-until-init~]\">" enable-push-notifications)
 908       (when logout
 909         (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>"
 910                 (make-csrf-token)))
 911       (when ignore
 912         (funcall ignore))
 913       (when enable-push-notifications
 914         (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>"
 915                 (find-subscription *current-auth-token*)))
 916       (when (and new-conversation liu)
 917         (multiple-value-bind (text to)
 918             (typecase new-conversation (string (values "Send private message" new-conversation)) (t "New conversation"))
 919           (format out-stream "<a class=\"new-private-message button\" href=\"/conversation~@[?to=~A~]\">~A</a>"
 920                   to text)))
 921       (when (and new-post liu)
 922         (format out-stream "<a class=\"new-post button\" href=\"/edit-post~@[?section=~A~]\" accesskey=\"n\" title=\"Create new post [n]\">New post</a>"
 923                 (typecase new-post (string new-post) (t nil))))
 924       (when (and title rss)
 925         (format out-stream "<a class=\"rss\" rel=\"alternate\" type=\"application/rss+xml\" title=\"~A RSS feed\" href=\"~A\">RSS</a>"
 926                 title (replace-query-params (hunchentoot:request-uri*) "offset" nil "format" "rss")))
 927       (format out-stream "</div>"))))
 928
 929 (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)
 930   (alexandria:switch ((hunchentoot:get-parameter "format") :test #'string=)
 931                      ("rss"
 932                       (setf (hunchentoot:content-type*) "application/rss+xml; charset=utf-8")
 933                       (with-response-stream (out-stream)
 934                         (write-index-items-to-rss out-stream items :title title)))
 935                      (t
 936                        (emit-page (out-stream :title (if hide-title nil title) :description (site-description *current-site*) :content-class content-class
 937                                               :current-uri current-uri :robots (if (hunchentoot:get-parameter :offset) "noindex, nofollow")
 938                                               :pagination pagination :top-nav top-nav :extra-head extra-head)
 939                                   (if alternate-html
 940                                       (funcall alternate-html)
 941                                       (write-index-items-to-html out-stream items
 942                                                                  :need-auth need-auth
 943                                                                  :skip-section section))))))
 944
 945 (defun link-if-not (stream linkp url class text &key accesskey nofollow title)
 946   (declare (dynamic-extent linkp url text))
 947   (if (not linkp)
 948       (format stream "<a href=\"~A\" class=\"~A\"~@[ accesskey=\"~A\"~]~:[~; rel=\"nofollow\"~]~@[ title=\"~A\"~]>~A</a>" url class accesskey nofollow title text)
 949       (format stream "<span class=\"~A\"~@[ title=\"~A\"~]>~A</span>" class title text)))
 950
 951 (defgeneric main-site-link (site item-type item-designator &key)
 952   (:method ((site lw2-frontend-site) (item-type (eql :post)) (post-id string) &key slug comment-id direct-comment-link)
 953     (merge-uris
 954      (format nil "/posts/~A/~A~[~;#~A~;?commentId=~A~]" post-id slug (if comment-id (if direct-comment-link 2 1) 0) comment-id)
 955      (main-site-uri *current-site*)))
 956   (:method ((site lw2-frontend-site) (item-type (eql :tag)) (slug string) &key comment-id direct-comment-link)
 957     (when (not (and comment-id direct-comment-link))
 958       (merge-uris
 959        (format nil "/tag/~A~@[/discussion#~A~]" slug comment-id)
 960        (main-site-uri *current-site*)))))
 961
 962 (defun postprocess-markdown (markdown)
 963   (if (typep *current-site* 'alternate-frontend-site)
 964       (regex-replace-body
 965        ((concatenate 'string (regex-replace-all "\\." (site-uri *current-site*) "\\.") "posts/([^/ ]{17})/([^/# ]*)(?:(#comment-|/comment/|/answer/)([^/ ]{17}))?")
 966         markdown)
 967        (main-site-link *current-site*
 968                        :post (reg 0) :slug (reg 1) :comment-id (reg 3)
 969                        :direct-comment-link (and (reg 3) (reg 2) (string= "/" (reg 2) :end2 1))))
 970       markdown))
 971
 972 (defun redirect (uri &key (type :see-other) preserve-query)
 973   (setf (hunchentoot:return-code*) (ecase type (:see-other 303) (:permanent 301))
 974         (hunchentoot:header-out "Location") (if-let ((query (and preserve-query (hunchentoot:query-string*))))
 975                                                     (quri:render-uri (quri:make-uri :defaults uri :query query))
 976                                                     uri)))
 977
 978 (defun main-site-redirect (uri &key (type :see-other))
 979   (redirect (merge-uris uri (main-site-uri *current-site*)) :type type))
 980
 981 (defmacro request-method (&body method-clauses)
 982   (with-gensyms (request-method)
 983     `(let ((,request-method (hunchentoot:request-method*)))
 984        (cond
 985          ,.(loop for method-body in method-clauses
 986               collect (destructuring-bind (method args &body inner-body) method-body
 987                         `(,(if (eq method :get) `(member ,request-method '(:get :head)) `(eq ,request-method ,method))
 988                            ,(make-binding-form (mapcar (lambda (x) (append (ensure-list x) `(:request-type ,method))) args)
 989                                                inner-body))))))))
 990
 991 (defmacro define-page (name path-specifier additional-vars &body body)
 992   (labels ((make-lambda (args)
 993              (loop for a in args
 994                    collect (if (atom a) a (first a)))))
 995    (multiple-value-bind (path-specifier-form path-bindings-wrapper specifier-vars)
 996     (if (stringp path-specifier)
 997         (values path-specifier #'identity)
 998         (destructuring-bind (specifier-type specifier-body &rest specifier-args) path-specifier
 999           (ecase specifier-type
1000             (:function
1001               (values `(lambda (r) (funcall ,specifier-body (hunchentoot:request-uri r)))
1002                       (if specifier-args
1003                           (lambda (body) `(ignorable-multiple-value-bind ,(make-lambda specifier-args) (funcall ,specifier-body (hunchentoot:request-uri*)) ,body))
1004                           #'identity)
1005                       specifier-args))
1006             (:regex
1007               (let ((fn `(lambda (r) (ppcre:scan-to-strings ,specifier-body (hunchentoot:request-uri r)))))
1008                 (values fn
1009                         (lambda (body)
1010                           (with-gensyms (result-vector)
1011                             `(let ((,result-vector (nth-value 1 (funcall ,fn hunchentoot:*request*))))
1012                                (declare (type simple-vector ,result-vector)
1013                                         (ignorable ,result-vector))
1014                                (let
1015                                  ,(loop for v in (make-lambda specifier-args) as x from 0 collecting `(,v (if (> (length ,result-vector) ,x) (aref ,result-vector ,x))))
1016                                  ,body))))
1017                         specifier-args))))))
1018      `(hunchentoot:define-easy-handler (,name :uri ,path-specifier-form) ()
1019         (with-error-page
1020             (block nil
1021               ,(funcall path-bindings-wrapper
1022                         (make-binding-form (append (mapcar (lambda (x) (append (ensure-list x) '(:passthrough t))) specifier-vars) additional-vars)
1023                                            body))))))))
1024
1025 (define-component sort-widget (&key (sort-options '((:new :description "Sort by date posted")
1026                                                     (:hot :description "Sort by time-weighted score")
1027                                                     (:active :description "Sort by date posted or last comment")
1028                                                     (:old :description "Sort by date posted, oldest first")))
1029                                     (pref :default-sort) (param-name "sort") (html-class "sort"))
1030   (:http-args ((sort :real-name param-name :member (mapcar (lambda (x) (if (listp x) (first x) x)) sort-options))
1031                (sortedby :real-name "sortedBy" :type string)
1032                &without-csrf-check))
1033   (if sortedby
1034       (progn
1035         (renderer () nil)
1036         sortedby)
1037       (let ((sort-string (if sort (string-downcase sort))))
1038         (if sort-string
1039             (set-user-pref :default-sort sort-string))
1040         (renderer ()
1041                   (sublevel-nav-to-html sort-options
1042                                         (user-pref pref)
1043                                         :param-name param-name
1044                                         :extra-class html-class))
1045         (or sort-string (user-pref pref)))))
1046
1047 (define-component view-index ()
1048   (:http-args ((view :member '(:all :new :frontpage :featured :alignment-forum :questions :nominations :reviews :events) :default :frontpage)
1049                before after
1050                (offset :type fixnum)
1051                (limit :type fixnum :default (user-pref :items-per-page))
1052                (karma-threshold :type fixnum)
1053                &without-csrf-check))
1054   (when (eq view :new) (redirect (replace-query-params (hunchentoot:request-uri*) "view" "all" "all" nil) :type :permanent) (return))
1055   (component-value-bind ((sort-string sort-widget))
1056     (multiple-value-bind (posts total)
1057         (get-posts-index :view (string-downcase view) :before before :after after :offset offset :limit (1+ limit) :sort sort-string :karma-threshold karma-threshold)
1058       (let ((page-title (format nil "~@(~A posts~)" view)))
1059         (renderer ()
1060                   (view-items-index (firstn posts limit)
1061                                     :section view :title page-title :hide-title (eq view :frontpage)
1062                                     :pagination (pagination-nav-bars :offset (or offset 0) :total total :with-next (and (not total) (> (length posts) limit)))
1063                                     :content-class (format nil "index-page ~(~A~)-index-page" view)
1064                                     :top-nav (lambda ()
1065                                                (page-toolbar-to-html :title page-title
1066                                                                      :new-post (if (eq view :meta) "meta" t))
1067                                                (funcall sort-widget))))))))
1068
1069 (defmacro route-component (name lambda-list &rest args)
1070   `(lambda ,lambda-list
1071      (with-error-page
1072          (component-value-bind ((() (,name ,@args)))
1073                                (when ,name
1074                                  (funcall ,name))))))
1075
1076 (defmacro define-component-routes (site-class &rest clauses)
1077   `(progn
1078      ,@(iter
1079         (for clause in clauses)
1080         (destructuring-bind (name (route-class &rest route-args) route-bindings (component-name &rest component-args)) clause
1081           (collect `(define-route ',site-class ',route-class
1082                       :name ',name ,@route-args
1083                       :handler (route-component ,component-name ,route-bindings ,@component-args)))))))
1084
1085 (define-component-routes forum-site
1086   (view-root (standard-route :uri "/") () (view-index))
1087   (view-index (standard-route :uri "/index") () (view-index)))
1088
1089 (hunchentoot:define-easy-handler
1090     (view-site-routes
1091      :uri (lambda (req)
1092             (declare (ignore req))
1093             (with-site-context ((let ((host (or (hunchentoot:header-in* :x-forwarded-host) (hunchentoot:header-in* :host))))
1094                                   (or (find-site host)
1095                                       (error "Unknown site: ~A" host))))
1096               (call-route-handler *current-site* (hunchentoot:script-name*)))))
1097     nil)
1098
1099 (define-page view-post "/post" ((id :required t))
1100   (redirect (generate-item-link :post id) :type :permanent))
1101
1102 (define-page view-post-lw1-link (:function #'match-lw1-link) ()
1103   (redirect (convert-lw1-link (hunchentoot:script-name*)) :preserve-query t :type :permanent))
1104
1105 (define-page view-post-ea1-link (:function #'match-ea1-link) ()
1106   (redirect (convert-ea1-link (hunchentoot:script-name*)) :preserve-query t :type :permanent))
1107
1108 (define-page view-post-lw2-slug-link (:function #'match-lw2-slug-link) ()
1109   (redirect (convert-lw2-slug-link (hunchentoot:request-uri*)) :type :see-other))
1110
1111 (define-page view-post-lw2-sequence-link (:function #'match-lw2-sequence-link) ()
1112   (redirect (convert-lw2-sequence-link (hunchentoot:request-uri*)) :type :see-other))
1113
1114 (define-page view-feed "/feed" ()
1115   (redirect "/?format=rss" :type :permanent))
1116
1117 (define-page view-allposts "/allPosts" ()
1118   (redirect (format nil "/index~@[?~A~]" (hunchentoot:query-string*)) :type :see-other))
1119
1120 (define-page view-nominations "/nominations" ()
1121   (redirect "/index?view=nominations" :type :see-other))
1122
1123 (define-page view-reviews "/reviews" ()
1124   (redirect "/index?view=reviews" :type :see-other))
1125
1126 (define-page view-review-voting "/reviewVoting" ()
1127   (redirect "https://www.lesswrong.com/reviewVoting" :type :see-other))
1128
1129 (define-page view-coronavirus-link-database "/coronavirus-link-database" ()
1130   (redirect "https://www.lesswrong.com/coronavirus-link-database" :type :see-other))
1131
1132 (defun post-comment (&key need-auth ((:post-id post-id-real)) ((:tag-id tag-id-real)) shortform)
1133   (request-method
1134    (: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)
1135      (let ((lw2-auth-token *current-auth-token*))
1136        (assert lw2-auth-token)
1137        (let* ((post-id (or post-id-real post-id))
1138               (tag-id (or tag-id-real tag-id))
1139               (question (when post-id (cdr (assoc :question (get-post-body post-id :auth-token lw2-auth-token)))))
1140               (new-comment-result
1141                (cond
1142                  (text
1143                   (let ((comment-data
1144                          (list-cond
1145                           (t :body (postprocess-markdown text))
1146                           ((and post-id (not (or edit-comment-id (and shortform (not parent-comment-id))))) :post-id post-id)
1147                           ((and tag-id (not edit-comment-id)) :tag-id tag-id)
1148                           (parent-comment-id :parent-comment-id parent-comment-id)
1149                           (answer :answer t)
1150                           (nomination :nominated-for-review "2020")
1151                           (nomination-review :reviewing-for-review "2020")
1152                           (parent-answer-id :parent-answer-id parent-answer-id)
1153                           (af :af t)
1154                           ((and shortform (not parent-comment-id)) :shortform t))))
1155                     (if edit-comment-id
1156                         (do-lw2-comment-edit lw2-auth-token edit-comment-id comment-data)
1157                         (do-lw2-comment lw2-auth-token comment-data))))
1158                  (retract-comment-id
1159                   (do-lw2-comment-edit lw2-auth-token retract-comment-id '((:retracted . t))))
1160                  (unretract-comment-id
1161                   (do-lw2-comment-edit lw2-auth-token unretract-comment-id '((:retracted . :false))))
1162                  (delete-comment-id
1163                   (do-lw2-comment-remove lw2-auth-token delete-comment-id :reason "Comment deleted by its author.")
1164                   nil))))
1165          (when post-id
1166            (ignore-errors
1167              (get-post-comments post-id :force-revalidate t)
1168              (when question
1169                (get-post-answers post-id :force-revalidate t))))
1170          (when text
1171            (alist-bind ((new-comment-id simple-string :--id)
1172                         (new-comment-html simple-string :html-body))
1173                        new-comment-result
1174                        (mark-comment-replied (alist* :parent-comment-id parent-comment-id :user-id *current-userid* new-comment-result))
1175                        (setf (markdown-source :comment new-comment-id new-comment-html) text)
1176                        (redirect (merge-uris (quri:make-uri :fragment (format nil "comment-~A" new-comment-id)
1177                                                             :query (list-cond (need-auth "need-auth" "y")))
1178                                              (hunchentoot:request-uri*))))))))))
1179
1180 (defun output-comments (out-stream id comments target &key overcomingbias-sort preview chrono replies-open)
1181   (labels ((output-comments-inner ()
1182              (with-error-html-block ()
1183                (if target
1184                    (comment-thread-to-html out-stream
1185                                            (lambda ()
1186                                              (comment-item-to-html
1187                                               out-stream
1188                                               target
1189                                               :level-invert preview
1190                                               :extra-html-fn (lambda (c-id)
1191                                                                (let ((*comment-individual-link* nil))
1192                                                                  (comment-tree-to-html out-stream (make-comment-parent-hash comments)
1193                                                                                        :target c-id
1194                                                                                        :level-invert preview))))))
1195                    (if comments
1196                        (progn #|<div class="comments-empty-message">(safe (pretty-number (length comments) id))</div>|#
1197                          (if chrono
1198                              (comment-chrono-to-html out-stream comments)
1199                              (let ((parent-hash (make-comment-parent-hash comments)))
1200                                (when overcomingbias-sort
1201                                  (setf (gethash nil parent-hash)
1202                                        (sort-items (gethash nil parent-hash) :old)))
1203                                (comment-tree-to-html out-stream parent-hash))))
1204                        <div class="comments-empty-message">("No ~As." id)</div>)))))
1205     (if preview
1206         (output-comments-inner)
1207         (progn (format out-stream "<div id=\"~As\" class=\"comments~:[~; replies-open~]\">" id (and *enable-voting* replies-open))
1208                (unless target
1209                  <script>initializeCommentControls\(\)</script>)
1210                (output-comments-inner)
1211                (format out-stream "</div>")))))
1212
1213 (define-json-endpoint (view-karma-vote-post forum-site "/karma-vote/post")
1214   (let ((auth-token *current-auth-token*))
1215     (request-method
1216      (:get (post-id)
1217        (hash-cond (make-hash-table)
1218          (post-id "Post" (sethash (make-hash-table) post-id (get-post-vote post-id auth-token)))
1219          (post-id "Comment" (get-post-comments-votes post-id auth-token))
1220          (post-id "Tag" (get-post-tag-votes post-id auth-token)))))))
1221
1222 (define-page view-post-lw2-link (:function #'match-lw2-link post-id comment-id * comment-link-type post-type)
1223                                 (need-auth
1224                                  chrono
1225                                  (show-comments :real-name "comments" :type boolean :default t)
1226                                  (format :type string))
1227   (request-method
1228    (:get ()
1229      (when (hunchentoot:get-parameter "commentId")
1230        (redirect (format nil "~A/comment/~A" (generate-item-link :post post-id) comment-id))
1231        (return))
1232      (let* ((lw2-auth-token *current-auth-token*)
1233             (preview (string-equal format "preview"))
1234             (show-comments (and (not preview) show-comments))
1235             (*enable-voting* (not (null (logged-in-userid)))))
1236        (multiple-value-bind (post title condition)
1237            (handler-case (nth-value 0 (get-post-body post-id :auth-token (and need-auth lw2-auth-token)))
1238              (serious-condition (c)
1239                (setf *enable-voting* nil)
1240                (values nil "[missing post]" c))
1241              (:no-error (post)
1242                (values post (cdr (assoc :title post)) nil)))
1243          (let* ((is-event (cdr (assoc :is-event post)))
1244                 (correct-subtype (if is-event "event" "post")))
1245            (when (string/= post-type correct-subtype)
1246              (redirect (generate-item-link :post post :comment-id comment-id :item-subtype correct-subtype))
1247              (return)))
1248          (labels ((extra-head ()
1249                     (when-let (canonical-source (or (and (not comment-id)
1250                                                          (cdr (assoc :canonical-source post)))
1251                                                     (and (always-canonical *current-site*)
1252                                                          (main-site-link *current-site* :post post-id :slug (cdr (assoc :slug post))
1253                                                                          :comment-id comment-id :direct-comment-link t))))
1254                               <link rel="canonical" href=canonical-source>)
1255                     <script>postId=(with-html-stream-output (:stream stream) (json:encode-json post-id stream))</script>
1256                     <script>alignmentForumPost=(if (cdr (assoc :af post)) "true" "false")</script>
1257                     (when (logged-in-userid)
1258                               (call-with-server-data 'process-vote-data (format nil "/karma-vote/post?post-id=~A" post-id))))
1259                   (retrieve-individual-comment (comment-thread-type)
1260                     (let* ((comments (case comment-thread-type
1261                                        (:comment (get-post-comments post-id))
1262                                        (:answer (get-post-answers post-id))))
1263                            (target-comment (find comment-id comments :key (lambda (c) (cdr (assoc :--id c))) :test #'string=)))
1264                       (values comments target-comment))))
1265            (if comment-id
1266                (let ((comment-thread-type (if (string= comment-link-type "answer") :answer :comment)))
1267                  (multiple-value-bind (comments target-comment) (retrieve-individual-comment comment-thread-type)
1268                    (unless target-comment
1269                      ;; If the comment was not found, try as an answer, or vice versa.
1270                      (setf comment-thread-type (if (eq comment-thread-type :comment) :answer :comment)
1271                            (values comments target-comment) (retrieve-individual-comment comment-thread-type))
1272                      (unless target-comment
1273                        (error 'lw2-not-found-error)))
1274                    (let* ((*comment-individual-link* t)
1275                           (display-name (get-username (cdr (assoc :user-id target-comment))))
1276                           (verb-phrase (cond
1277                                          ((and (eq comment-thread-type :answer)
1278                                                (not (cdr (assoc :parent-comment-id target-comment))))
1279                                           "answers")
1280                                          (t "comments on"))))
1281                      (emit-page (out-stream :title (format nil "~A ~A ~A" display-name verb-phrase title)
1282                                             :content-class "individual-thread-page comment-thread-page"
1283                                             :social-description (when-let (x (cdr (assoc :html-body target-comment))) (extract-excerpt x))
1284                                             :extra-head #'extra-head)
1285                                 (unless preview
1286                                   (format out-stream "<h1 class=\"post-title\">~A ~A <a href=\"~A\">~A</a></h1>"
1287                                           (encode-entities display-name)
1288                                           verb-phrase
1289                                           (generate-item-link :post post-id)
1290                                           (clean-text-to-html title :hyphenation nil)))
1291                                 (output-comments out-stream "comment" comments target-comment :chrono chrono :preview preview)))))
1292                (let ((post-sequences (get-post-sequences post-id)))
1293                  (emit-page (out-stream :title title
1294                                         :content-class (format nil "post-page comment-thread-page~{ ~A~}"
1295                                                                (list-cond ((cdr (assoc :question post)) "question-post-page")
1296                                                                           (post-sequences "in-sequence")
1297                                                                           ((not show-comments) "no-comments")))
1298                                         :social-description (when-let (x (cdr (assoc :html-body post))) (extract-excerpt x))
1299                                         :extra-head #'extra-head)
1300                             (cond
1301                               (condition
1302                                (error-explanation-case (error-to-html condition)
1303                                                        (lw2-not-allowed-error
1304                                                         <p>This probably means the post has been deleted or moved back to the author's drafts.</p>)))
1305                               (t
1306                                (post-body-to-html post)))
1307                             (when (and lw2-auth-token (equal (logged-in-userid) (cdr (assoc :user-id post))))
1308                               (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>"
1309                                       (cdr (assoc :--id post))))
1310                             (alist-bind (fm-crosspost foreign-post) post
1311                               (alist-bind (is-crosspost hosted-here) fm-crosspost
1312                                 (when is-crosspost
1313                                   (if-let (crosspost-site-host (backend-magnum-crosspost-site *current-backend*))
1314                                       (let* ((*current-site* (find-site crosspost-site-host))
1315                                              (crosspost-site-title (main-site-title *current-site*)))
1316                                         (alist-bind (comment-count base-score) foreign-post
1317                                           <a class="crosspost" href=(generate-item-link :post foreign-post :absolute t)>Crossposted (if hosted-here "to" "from") (progn crosspost-site-title)
1318                                                                                                                         \ \((safe (pretty-number (or base-score 0) "point")), (safe (pretty-number (or comment-count 0) "comment"))\)</a>))
1319                                       (error "Could not retrieve crossposted post. magnum-crosspost-site not configured.")))))
1320                             (post-nav-links post post-sequences)
1321                             (activate-client-trigger "postLoaded")
1322                             (when show-comments
1323                               (write-string "<script> </script>" out-stream)
1324                               (finish-output out-stream)
1325                               (with-error-html-block ()
1326                                 ;; Temporary hack to support nominations
1327                                 (let* ((real-comments (get-post-comments post-id))
1328                                        (answers (when (cdr (assoc :question post))
1329                                                   (get-post-answers post-id)))
1330                                        (posted-at (and (typep *current-backend* 'backend-lw2)
1331                                                        (cdr (assoc :posted-at post))))
1332                                        (posted-timestamp (and posted-at (local-time:parse-timestring posted-at)))
1333                                        (now (local-time:now))
1334                                        (nominations-open nil)
1335                                        (reviews-eligible (timerange "2020-01-01" posted-timestamp "2021-01-01"))
1336                                        (reviews-open (and reviews-eligible (timerange "2021-12-14" now "2022-01-11"))))
1337                                   (labels ((top-level-property (comment property)
1338                                              (or (cdr (assoc property comment))
1339                                                  (cdr (assoc property (cdr (assoc :top-level-comment comment)))))))
1340                                     (multiple-value-bind (normal-comments nominations reviews)
1341                                         (loop for comment in real-comments
1342                                            if (top-level-property comment :nominated-for-review)
1343                                            collect comment into nominations
1344                                            else if (top-level-property comment :reviewing-for-review)
1345                                            collect comment into reviews
1346                                            else
1347                                            collect comment into normal-comments
1348                                            finally (return (values normal-comments nominations reviews)))
1349                                       (loop for (name comments open) in (list-cond ((or nominations nominations-open)
1350                                                                                     (list "nomination" nominations nominations-open))
1351                                                                                    ((or reviews reviews-open)
1352                                                                                     (list "review" reviews reviews-open))
1353                                                                                    ((cdr (assoc :question post))
1354                                                                                     (list "answer" answers t))
1355                                                                                    (t
1356                                                                                     (list "comment" normal-comments t)))
1357                                          do (output-comments out-stream name comments nil
1358                                                              :replies-open open
1359                                                              :overcomingbias-sort (cdr (assoc :comment-sort-order post)) :chrono chrono :preview preview))))))))))))))
1360    (:post ()
1361           (post-comment :post-id post-id :need-auth need-auth))))
1362
1363 (defparameter *edit-post-template* (compile-template* "edit-post.html"))
1364
1365 (define-page view-edit-post "/edit-post" (title url section tags post-id link-post)
1366   (request-method
1367     (:get ()
1368      (let* ((csrf-token (make-csrf-token))
1369             (post-body (if post-id (get-post-body post-id :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1370             (section (or section (loop for (sym . sec) in '((:draft . "drafts") (:meta . "meta") (:frontpage-date . "frontpage"))
1371                                        if (cdr (assoc sym post-body)) return sec
1372                                        finally (return "all")))))
1373        (emit-page (out-stream :title (if post-id "Edit Post" "New Post") :content-class "edit-post-page")
1374                   (render-template* *edit-post-template* out-stream
1375                                     :csrf-token csrf-token
1376                                     :title (cdr (assoc :title post-body))
1377                                     :url (cdr (assoc :url post-body))
1378                                     :question (cdr (assoc :question post-body))
1379                                     :tags-supported (typep *current-backend* 'backend-accordius)
1380                                     :tags (when (and post-id (typep *current-backend* 'backend-accordius)) (do-wl-rest-query (format nil "posts/~a/update_tagset/" post-id) '()))
1381                                     :post-id post-id
1382                                     :section-list (loop for (name desc) in '(("all" "All") ("meta" "Meta") ("frontpage" "Frontpage") ("drafts" "Drafts"))
1383                                                      when (or (string= name section) (member name '("drafts" "all") :test #'string=))
1384                                                      collect (alist :name name :desc desc :selected (string= name section)))
1385                                     :lesswrong-misc (typep *current-backend* 'backend-lw2-misc-features)
1386                                     :submit-to-frontpage (if post-id (cdr (assoc :submit-to-frontpage post-body)) t)
1387                                     :markdown-source (or (and post-id (markdown-source :post post-id (cdr (assoc :html-body post-body)))) "")))))
1388     (:post (text question submit-to-frontpage)
1389      (let ((lw2-auth-token *current-auth-token*)
1390            (url (if (string= url "") nil url)))
1391        (assert lw2-auth-token)
1392        (let* ((post-data
1393                (list-cond
1394                 (t :body (postprocess-markdown text))
1395                 (t :title (or (nonempty-string title) "Untitled"))
1396                 (link-post :url url)
1397                 (t :meta (or (string= section "meta") :false))
1398                 ((not post-id) :is-event nil)
1399                 (t :draft (or (string= section "drafts") :false))
1400                 ((typep *current-backend* 'backend-lw2-misc-features) :submit-to-frontpage (and submit-to-frontpage t))
1401                 ((not post-id) :question (if question t :false))))
1402               (post-unset
1403                (list-cond
1404                 ((not link-post) :url t)))
1405               (new-post-data
1406                (if post-id
1407                    (do-lw2-post-edit lw2-auth-token post-id post-data post-unset)
1408                    (do-lw2-post lw2-auth-token post-data)))
1409               (new-post-id (cdr (assoc :--id new-post-data))))
1410          (assert new-post-id)
1411          (when (typep *current-backend* 'backend-accordius)
1412            (do-wl-rest-mutate :post
1413              (format nil "posts/~a/update_tagset/" post-id)
1414              (alist "tags" tags)
1415              lw2-auth-token))
1416          (setf (markdown-source :post new-post-id (cdr (assoc :html-body new-post-data))) text)
1417          (ignore-errors (get-post-body post-id :force-revalidate t))
1418          (redirect (if (js-true (cdr (assoc :draft post-data)))
1419                        (concatenate 'string (generate-item-link :post new-post-data) "?need-auth=y")
1420                        (generate-item-link :post new-post-data))))))))
1421
1422 (define-json-endpoint (view-karma-vote forum-site "/karma-vote")
1423     (let ((auth-token *current-auth-token*))
1424       (request-method
1425        (:post (target target-type (vote-json :real-name "vote"))
1426               (let ((vote (safe-decode-json vote-json)))
1427                 (multiple-value-bind (current-vote result)
1428                     (do-lw2-vote auth-token target-type target vote)
1429                   (alist-bind (vote-count base-score af af-base-score extended-score) result
1430                               (let ((vote-buttons (vote-buttons base-score
1431                                                                 :as-text t
1432                                                                 :af-score (and af af-base-score)
1433                                                                 :vote-count (+ vote-count (if (member (cdr (assoc :karma current-vote)) '(nil "neutral") :test #'equal)
1434                                                                                               0
1435                                                                                               1))
1436                                                                 :extended-score extended-score))
1437                                     (out (make-hash-table)))
1438                                 (loop for (axis . axis-vote) in current-vote
1439                                    do (setf (gethash axis out) (list* axis-vote (gethash axis vote-buttons))))
1440                                 out))))))))
1441
1442 (delete-easy-handler 'view-karma-vote)
1443
1444 (define-json-endpoint (view-user-status login-site "/current-user-status")
1445     (let ((auth-token *current-auth-token*))
1446       (request-method
1447        (:get ()
1448              (if (lw2-graphql-query (graphql-query-string "currentUser" nil '(:--id)) :auth-token auth-token)
1449                  (sethash (make-hash-table)
1450                           "notifications" (check-notifications (logged-in-userid) auth-token)
1451                           "alignmentForumAllowed" (member "alignmentForum" (cdr (assoc :groups (get-user :user-id (logged-in-userid)))) :test #'string=))
1452                  (with-cache-transaction
1453                    (cache-del "auth-token-to-userid" auth-token)
1454                    (cache-del "auth-token-to-username" auth-token)))))))
1455
1456 (hunchentoot:define-easy-handler (view-check-notifications :uri "/check-notifications") (format)
1457   (with-error-page
1458       (setf (hunchentoot:content-type*) "application/json")
1459       (if *current-auth-token*
1460           (let ((notifications-status (check-notifications (logged-in-userid) *current-auth-token* :full (string= format "push"))))
1461             (json:encode-json-to-string notifications-status)))))
1462
1463 (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)
1464   (with-error-page
1465       (check-csrf-token csrf-token)
1466       (let ((user-id (logged-in-userid)))
1467         (unless user-id (error "Not logged in."))
1468         (with-cache-transaction
1469             (let ((ignore-hash (get-ignore-hash user-id)))
1470               (if (string= state "ignore")
1471                   (setf (gethash target-id ignore-hash) t)
1472                   (remhash target-id ignore-hash))
1473               (cache-put "user-ignore-list" user-id ignore-hash :value-type :json))))
1474       (when return
1475         (redirect return))))
1476
1477 (client-defun comment-controls (&key standalone parent-comment-id parent-answer-id edit-comment-id)
1478   (flet ((inner ()
1479            <form method="post" id="conversation-form" class="aligned-form">
1480              <div class="textarea-container">
1481                <textarea name="text" oninput="enableBeforeUnload();"></textarea>
1482                <span class="markdown-reference-link">You can use <a href="http://commonmark.org/help/" target="_blank">Markdown</a> here.</span>
1483                <button type="button" class="guiedit-mobile-auxiliary-button guiedit-mobile-help-button">Help</button>
1484                <button type="button" class="guiedit-mobile-auxiliary-button guiedit-mobile-exit-button">Exit</button>
1485              </div>
1486              <div>
1487                (macrolet ((hidden-var (name)
1488                             `(when ,name <input type="hidden" name=,(string-downcase name) value=,name>)))
1489                  (hidden-var parent-comment-id)
1490                  (hidden-var parent-answer-id)
1491                  (hidden-var edit-comment-id))
1492                <input name="csrf-token" value=(make-csrf-token) type="hidden">
1493                <input value="Submit" type="submit">
1494              </div>
1495              </form>))
1496     (if standalone
1497         <div class="posting-controls standalone with-markdown-editor" onsubmit="disableBeforeUnload();">(with-html-stream-output (inner))</div>
1498         (inner))))
1499
1500 (define-json-endpoint (view-karma-vote-shortform shortform-site "/karma-vote/shortform")
1501   (let ((auth-token *current-auth-token*))
1502     (request-method
1503      (:get ((offset :type fixnum :default 0))
1504            (sethash (make-hash-table)
1505                     "Comment" (get-shortform-votes auth-token :offset offset))))))
1506
1507 (define-component view-comments-index (index-type)
1508   (:http-args ((offset :type fixnum)
1509                (limit :type fixnum)
1510                (view :member '(nil :alignment-forum))))
1511   (request-method
1512    (:get ()
1513      (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.
1514             (shortform (eq index-type :shortform))
1515             (with-voting (not (null (and shortform (logged-in-userid))))))
1516        (multiple-value-bind (title query-view top-nav)
1517            (cond
1518              (shortform (values "Shortform" "shortform" (if (logged-in-userid) (lambda () (comment-controls :standalone t)))))
1519              (t (values (case view (:alignment-forum "Alignment Forum recent comments") (t "Recent comments")) "allRecentComments" nil)))
1520          (multiple-value-bind (recent-comments total)
1521              (if (or (not (eq index-type :recent-comments)) offset limit view (/= (user-pref :items-per-page) 20))
1522                  (let ((*use-alignment-forum* (eq view :alignment-forum)))
1523                    (lw2-graphql-query (lw2-query-string :comment :list
1524                                                         (remove nil (alist :view query-view
1525                                                                            :limit (or limit (user-pref :items-per-page)) :offset offset)
1526                                                                 :key #'cdr)
1527                                                         :context (if shortform :shortform :index)
1528                                                         :with-total want-total)))
1529                  (get-recent-comments :with-total want-total))
1530            (renderer ()
1531              (view-items-index recent-comments
1532                                :title title
1533                                :extra-head (lambda ()
1534                                              (when with-voting
1535                                                (call-with-server-data 'process-vote-data (format nil "/karma-vote/shortform?offset=~A" (or offset 0)))))
1536                                :content-class (if shortform "index-page shortform-index-page comment-thread-page" "index-page comment-index-page")
1537                                :pagination (pagination-nav-bars :offset (or offset 0) :with-next (not want-total) :total (if want-total total))
1538                                :top-nav (lambda () (page-toolbar-to-html :title title) (when top-nav (funcall top-nav)))
1539                                :alternate-html (if (eq index-type :shortform)
1540                                                    (lambda ()
1541                                                      (let ((*enable-voting* with-voting))
1542                                                        <div class="comments">
1543                                                          (comment-tree-to-html *html-output*
1544                                                                                (make-comment-parent-hash
1545                                                                                 (flatten-shortform-comments recent-comments)))
1546                                                        </div>)))))))))
1547    (:post ()
1548      (post-comment :shortform t))))
1549
1550 (define-component-routes forum-site (view-recent-comments (standard-route :uri "/recentcomments") () (view-comments-index :recent-comments)))
1551 (define-component-routes shortform-site (view-shortform (standard-route :uri "/shortform") () (view-comments-index :shortform)))
1552
1553 (delete-easy-handler 'view-recent-comments)
1554
1555 (defun tag-to-html (tag &key skip-headline)
1556   (schema-bind (:tag tag :auto :context :body)
1557     (alist-bind (edited-at html user-id) description
1558       (unless skip-headline
1559         <h1 class="post-title">(safe (clean-text-to-html name))</h1>
1560         <div class="post-meta">
1561           <span>(if core "Core ")(if wiki-only "Wiki" "Tag")</span>
1562           (when (and (nonempty-string edited-at) (nonempty-string user-id))
1563             <span>Last edit: (pretty-time-html edited-at)
1564                   \ by <a class="author" href=("/users/~A" (get-user-slug user-id))>(get-username user-id)</a>
1565             </span>)
1566         </div>)
1567       (when html
1568         <div class="tag-description body-text">(with-html-stream-output (:stream stream) (let ((*memoized-output-stream* stream)) (clean-html* html)))</div>))))
1569
1570 (defun tag-list-to-html (tags)
1571   <ul class="tag-list">
1572     (iter (for tag in tags)
1573           (schema-bind (:tag tag :auto :context :index)
1574                        <li><a class="post-title-link" href=("/tag/~A" slug)>(safe (clean-text-to-html name))(if wiki-only
1575                                                                                                                 " (wiki)"
1576                                                                                                                 (if post-count (format nil " (~A)" post-count)))</a></li>))
1577   </ul>)
1578
1579 (define-json-endpoint (view-user-autocomplete forum-site "/-user-autocomplete")
1580     (request-method
1581      (:get (q)
1582           (lw2-search-query q :indexes '("test_users")))))
1583
1584 (define-json-endpoint (view-karma-vote-tag forum-site "/karma-vote/tag")
1585   (let ((auth-token *current-auth-token*))
1586     (request-method
1587      (:get (tag-id post-id)
1588        (hash-cond (make-hash-table)
1589          (tag-id "Post" (get-tag-post-votes tag-id auth-token))
1590          (tag-id "Comment" (get-tag-comments-votes tag-id auth-token))
1591          (post-id "Tag" (get-post-tag-votes post-id auth-token)))))))
1592
1593 (define-component view-tag (slug tail)
1594   (:http-args ((sort :default :relevant :member '(:relevant :new :old))))
1595   (when (nonempty-string tail)
1596     (redirect (format nil "/tag/~A" slug))
1597     (return))
1598   (let ((tag (first (lw2-graphql-query (lw2-query-string :tag :list (alist :view "tagBySlug" :slug slug) :context :body)))))
1599     (unless tag
1600       (error 'lw2-not-found-error))
1601     (request-method
1602      (:get ()
1603        (let* ((posts (get-tag-posts slug))
1604               (posts (if (eq sort :relevant) posts (sort-items posts sort))))
1605          (schema-bind (:tag tag :auto :context :body)
1606            (renderer ()
1607              (view-items-index posts
1608                                :title (format nil "~A tag" name)
1609                                :extra-head (lambda ()
1610                                              (when-let (canonical-source (and (always-canonical *current-site*)
1611                                                                               (main-site-link *current-site* :tag slug)))
1612                                                <link rel="canonical" href=canonical-source>)
1613                                              (when (logged-in-userid)
1614                                                (call-with-server-data 'process-vote-data (format nil "/karma-vote/tag?tag-id=~A" tag-id))))
1615                                :top-nav (lambda ()
1616                                           (page-toolbar-to-html :title name :rss (not wiki-only))
1617                                           (tag-to-html tag)
1618                                           (when (and posts (not *preview*))
1619                                             (sublevel-nav-to-html '(:relevant :new :old)
1620                                                                   sort
1621                                                                   :default :relevant
1622                                                                   :param-name "sort"
1623                                                                   :extra-class "sort")))
1624                                :content-class "index-page tag-index-page"
1625                                :alternate-html (lambda ()
1626                                                  (unless wiki-only
1627                                                    (write-index-items-to-html *html-output* posts))
1628                                                  (when (typep *current-backend* 'backend-lw2-tags-comments)
1629                                                    (finish-output *html-output*)
1630                                                    (let ((*enable-voting* (not (null (logged-in-userid))))
1631                                                          (comments (lw2-graphql-query (lw2-query-string :comment :list (alist :view "tagDiscussionComments" :tag-id tag-id)))))
1632                                                      (output-comments *html-output* "comment" comments nil :replies-open t)))))))))
1633      (:post ()
1634        (schema-bind (:tag tag (tag-id))
1635          (renderer ()
1636            (post-comment :tag-id tag-id)))))))
1637
1638 (define-component-routes forum-site (view-tag (regex-route :regex "^/(?:tag|topics)/([^/?]+)(/[^/?]*)?") (slug tail) (view-tag slug tail)))
1639
1640 (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/"))))
1641
1642 (define-component view-tags-index ()
1643   (:http-args ())
1644   (multiple-value-bind (all-tags portal)
1645       (lw2-graphql-query-multi
1646        (list (lw2-query-string* :tag :list (alist :view "allTagsAlphabetical"))
1647              (lw2-query-string* :tag :list (alist :view "tagBySlug" :slug "portal") :context :body)))
1648     (let ((core-tags
1649            (iter (for tag in all-tags)
1650                  (schema-bind (:tag tag (core))
1651                               (when core (collect tag)))))
1652           (title (if (typep *current-site* 'lesswrong-viewer-site) "Concepts Portal" "Tags Portal")))
1653       (renderer ()
1654         (emit-page (out-stream :title title)
1655           <article>
1656             <h1 class="post-title">(safe title)</h1>
1657             (tag-to-html (first portal) :skip-headline t)
1658           </article>
1659           (iter (for (title . tags) in (alist "Core Tags" core-tags "All Tags" all-tags))
1660                 (progn
1661                   <h1>(safe title)</h1>
1662                   (tag-list-to-html tags))))))))
1663
1664 (define-component-routes forum-site (view-tags-index (standard-route :uri "/tags") () (view-tags-index)))
1665 (define-component-routes forum-site (view-tags-index-alt (standard-route :uri "/topics") () (view-tags-index)))
1666
1667 (define-route 'forum-site 'standard-route :name 'view-tags-index-redirect :uri "/tags/all" :handler (lambda () (redirect "/tags")))
1668 (define-route 'forum-site 'standard-route :name 'view-tags-index-redirect :uri "/topics/all" :handler (lambda () (redirect "/topics")))
1669
1670 (define-route 'alternate-frontend-site 'standard-route :name 'view-tags-voting-redirect :uri "/tagVoting" :handler (lambda () (main-site-redirect "/tagVoting")))
1671 (define-route 'alternate-frontend-site 'standard-route :name 'view-tags-dashboard-redirect :uri "/tags/dashboard" :handler (lambda () (main-site-redirect "/tags/dashboard")))
1672
1673 (hunchentoot:define-easy-handler (view-push-register :uri "/push/register") ()
1674   (with-error-page
1675       (let* ((data (call-with-safe-json (lambda ()
1676                                           (json:decode-json-from-string
1677                                            (hunchentoot:raw-post-data :force-text t :external-format :utf-8)))))
1678              (subscription (cdr (assoc :subscription data)))
1679              (cancel (cdr (assoc :cancel data))))
1680         (cond
1681           (subscription
1682            (make-subscription *current-auth-token*
1683                               (cdr (assoc :endpoint subscription))
1684                               (cdr (assoc :expires *current-auth-status*)))
1685            (send-notification (cdr (assoc :endpoint subscription)) :ttl 120))
1686           (cancel
1687            (delete-subscription *current-auth-token*)))
1688         nil)))
1689
1690 (hunchentoot:define-easy-handler (view-inbox-redirect :uri "/push/go-inbox") ()
1691   (with-error-page
1692       (redirect (format nil "/users/~A?show=inbox" *current-user-slug*))))
1693
1694 (define-page view-user (:regex "^/users/(.*?)(?:$|\\?)|^/user" user-slug) (id
1695                                                                              (offset :type fixnum :default 0)
1696                                                                              (show :member '(:all :posts :comments :drafts :conversations :inbox) :default :all)
1697                                                                              (sort :member '(:top :new :old) :default :new))
1698              (let* ((auth-token (if (eq show :inbox) *current-auth-token*))
1699                     (user-info
1700                      (let ((ui (get-user (cond (user-slug :user-slug) (id :user-id)) (or user-slug id) :auth-token auth-token)))
1701                        (if (and (not (cdr (assoc :deleted ui))) (cdr (assoc :--id ui)))
1702                            ui
1703                            (error 'lw2-user-not-found-error))))
1704                     (user-id (cdr (assoc :--id user-info)))
1705                     (own-user-page (logged-in-userid user-id))
1706                     (display-name (if user-slug (cdr (assoc :display-name user-info)) user-id))
1707                     (show-text (if (not (eq show :all)) (string-capitalize show)))
1708                     (title (format nil "~A~@['s ~A~]" display-name show-text))
1709                     (sort-type (case sort (:top :score) (:new :date) (:old :date-reverse))))
1710                (multiple-value-bind (items total)
1711                  (case show
1712                    (:posts
1713                     (get-user-page-items user-id :posts :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type))
1714                    (:comments
1715                     (get-user-page-items user-id :comments :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type))
1716                    (:drafts
1717                     (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")))
1718                    (:conversations
1719                      (let ((conversations
1720                              (lw2-graphql-query (lw2-query-string :conversation :list
1721                                                                   (alist :view "userConversations" :limit (+ 1 (user-pref :items-per-page)) :offset offset :user-id user-id)
1722                                                                   :fields '(:--id :created-at :title (:participants :display-name :slug) :----typename))
1723                                                 :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1724                        (lw2-graphql-query-map
1725                          (lambda (c)
1726                            (lw2-query-string* :message :total (alist :view "messagesConversation" :conversation-id (cdr (assoc :--id c)))))
1727                          conversations
1728                          :postprocess (lambda (c result)
1729                                         (acons :messages-total result c))
1730                          :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1731                    (:inbox
1732                     (error-explanation-case
1733                      (prog1
1734                        (let ((notifications (get-notifications :user-id user-id :offset offset :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1735                              (last-check (ignore-errors (local-time:parse-timestring (cdr (assoc :last-notifications-check user-info))))))
1736                          (labels ((check-new (key obj)
1737                                     (if (ignore-errors (local-time:timestamp< last-check (local-time:parse-timestring (cdr (assoc key obj)))))
1738                                         (acons :highlight-new t obj)
1739                                         obj))
1740                                   (check-replied (comment)
1741                                     (let* ((post-id (cdr (assoc :post-id comment)))
1742                                            (comment-id (cdr (assoc :--id comment)))
1743                                            (reply-comment-id (check-comment-replied comment-id user-id)))
1744                                       (if reply-comment-id
1745                                           (acons :replied (list :post post-id :comment-id reply-comment-id) comment)
1746                                           comment))))
1747                            (lw2-graphql-query-map
1748                              (lambda (n)
1749                                (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1750                                                   ("comment"
1751                                                    (lw2-query-string* :comment :single
1752                                                                       (alist :document-id (cdr (assoc :document-id n)))
1753                                                                       :context :index))
1754                                                   ("post"
1755                                                    (lw2-query-string* :post :single (alist :document-id (cdr (assoc :document-id n)))))
1756                                                   ("message"
1757                                                    (lw2-query-string* :message :single (alist :document-id (cdr (assoc :document-id n)))
1758                                                                       :fields *messages-index-fields*))
1759                                                   (t
1760                                                     (values n t))))
1761                              notifications
1762                              :postprocess (lambda (n result)
1763                                             (if result
1764                                                 (funcall (if (string= (cdr (assoc :document-type n)) "comment") #'check-replied #'identity)
1765                                                          (check-new
1766                                                           (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1767                                                                              ("comment" :posted-at)
1768                                                                              ("post" :posted-at)
1769                                                                              ("message" :created-at))
1770                                                           result))
1771                                                 n))
1772                              :auth-token auth-token)))
1773                        (do-user-edit
1774                          (hunchentoot:cookie-in "lw2-auth-token")
1775                          user-id
1776                          (alist :last-notifications-check (timestamp-to-graphql (local-time:now)))))
1777                      (lw2-not-allowed-error
1778                       <p>This may mean your login token has expired or become invalid. You can try <a href="/login">logging in again</a>.</p>)))
1779                    (t
1780                     (get-user-page-items user-id :both :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type)))
1781                  (let ((with-next (> (length items) (+ (if (eq show :all) offset 0) (user-pref :items-per-page))))
1782                        (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
1783                    (view-items-index interleave :title title
1784                                      :content-class (format nil "user-page~@[ ~A-user-page~]~:[~; own-user-page~]" (string-downcase show) own-user-page)
1785                                      :current-uri (format nil "/users/~A" user-slug)
1786                                      :section :personal
1787                                      :pagination (pagination-nav-bars :offset offset :total total :with-next (if (not total) with-next))
1788                                      :need-auth (eq show :drafts) :section (if (eq show :drafts) "drafts" nil)
1789                                      :top-nav (lambda ()
1790                                                 (page-toolbar-to-html :title title
1791                                                                       :enable-push-notifications (eq show :inbox)
1792                                                                       :rss (not (member show '(:drafts :conversations :inbox)))
1793                                                                       :new-post (if (eq show :drafts) "drafts" t)
1794                                                                       :new-conversation (if own-user-page t user-slug)
1795                                                                       :ignore (if (and (logged-in-userid) (not own-user-page))
1796                                                                                   (lambda ()
1797                                                                                     (let ((ignored (gethash user-id *current-ignore-hash*)))
1798                                                                                       <form method="post" action="/ignore-user">
1799                                                                                         <button class=("button ~A" (if ignored "unignore-button" "ignore-button"))>(if ignored "Unignore user" "Ignore user")</button>
1800                                                                                         <input type="hidden" name="csrf-token" value=(make-csrf-token)>
1801                                                                                         <input type="hidden" name="target-id" value=user-id>
1802                                                                                         <input type="hidden" name="state" value=(if ignored "unignore" "ignore")>
1803                                                                                         <input type="hidden" name="return" value=(hunchentoot:request-uri*)>
1804                                                                                       </form>)))
1805                                                                       :logout own-user-page)
1806                                                 (alist-bind ((actual-id string :--id)
1807                                                              (actual-slug string :slug)
1808                                                              (karma (or null fixnum))
1809                                                              (af-karma (or null fixnum)))
1810                                                             user-info
1811                                                   <h1 class="page-main-heading"
1812                                                       (when (not own-user-page)
1813                                                         (format nil "data-~:[~;anti-~]~:*kibitzer-redirect=~:[/users/~*~A~;/user?id=~A~]"
1814                                                                 user-slug actual-id actual-slug))>
1815                                                       (progn display-name)
1816                                                       (let ((full-name (get-user-full-name user-id)))
1817                                                         (when (and user-slug (stringp full-name) (> (length full-name) 0))
1818                                                                   <span class="user-full-name">\((progn full-name)\)</span>))
1819                                                   </h1>
1820                                                   <div class="user-stats">
1821                                                     Karma:
1822                                                     <span class="karma-type">
1823                                                       <span class="karma-total">(if user-slug (pretty-number (or karma 0)) "##")</span>(if af-karma " (LW),")
1824                                                     </span>\
1825                                                     (when af-karma
1826                                                       <span class="karma-type">
1827                                                         <span class="karma-total af-karma-total">(if user-slug (pretty-number (or af-karma 0)) "##")</span> \(AF\)
1828                                                       </span>)
1829                                                   </div>
1830                                                   (when-let (html-bio (cdr (assoc :html-bio user-info)))
1831                                                     <div class="user-bio body-text">
1832                                                       (with-html-stream-output (:stream stream)
1833                                                         (let ((*memoized-output-stream* stream))
1834                                                           (clean-html* html-bio)))
1835                                                     </div>))
1836                                                 (sublevel-nav-to-html `(:all :posts :comments
1837                                                                              ,@(if own-user-page
1838                                                                                    '(:drafts :conversations :inbox)))
1839                                                                       show
1840                                                                       :default :all)
1841                                                 (when (member show '(:all :posts :comments))
1842                                                   (sublevel-nav-to-html '(:new :top :old)
1843                                                                         sort
1844                                                                         :default :new
1845                                                                         :param-name "sort"
1846                                                                         :extra-class "sort"))))))))
1847
1848 (defparameter *conversation-template* (compile-template* "conversation.html"))
1849
1850 (define-page view-conversation "/conversation" (id to subject)
1851   (request-method
1852    (:get ()
1853      (cond
1854        ((and id to) (error "This is an invalid URL."))
1855        (id
1856         (multiple-value-bind (conversation messages)
1857             (get-conversation-messages id (hunchentoot:cookie-in "lw2-auth-token"))
1858           (let ((conversation (rectify-conversation conversation)))
1859             (view-items-index (nreverse messages) :content-class "conversation-page" :need-auth t :title (encode-entities (cdr (assoc :title conversation)))
1860                               :top-nav (lambda () (render-template* *conversation-template* *html-output*
1861                                                                     :conversation conversation :csrf-token (make-csrf-token)))))))
1862        (t
1863         (emit-page (out-stream :title "New conversation" :content-class "conversation-page")
1864                    (render-template* *conversation-template* out-stream
1865                                      :to to
1866                                      :subject subject
1867                                      :csrf-token (make-csrf-token))))))
1868    (:post ((text :required t))
1869      (let* ((id (or id
1870                     (let ((participant-ids (list (logged-in-userid) (cdar (lw2-graphql-query (lw2-query-string :user :single (alist :slug to) :fields '(:--id)))))))
1871                       (do-create-conversation (hunchentoot:cookie-in "lw2-auth-token") (alist :participant-ids participant-ids :title subject))))))
1872        (do-create-message (hunchentoot:cookie-in "lw2-auth-token") id text)
1873        (redirect (format nil "/conversation?id=~A" id))))))
1874
1875 (defun search-result-markdown-to-html (item)
1876   (cons (cons :html-body
1877               (handler-case (nth-value 1 (cl-markdown:markdown (cdr (assoc :body item)) :stream nil))
1878                 (serious-condition () "[Error while processing search result]")))
1879         item))
1880
1881 (define-page view-search "/search" ((q :required t))
1882   (let ((*current-search-query* q)
1883         (link (presentable-link q :search))
1884         (title (format nil "~@[~A - ~]Search" q)))
1885     (declare (special *current-search-query*))
1886     (if link
1887         (redirect link)
1888         (multiple-value-bind (tags posts comments) (lw2-search-query q)
1889           (let ((tags (map 'list (lambda (tag)
1890                                    (alist* :----typename "Tag" tag))
1891                            tags)))
1892             (view-items-index (nconc
1893                                (map 'list (lambda (post) (if (cdr (assoc :comment-count post)) post (alist* :comment-count 0 post))) posts)
1894                                (map 'list #'search-result-markdown-to-html comments))
1895                               :top-nav (lambda ()
1896                                          (page-toolbar-to-html :title title :rss t)
1897                                          (when tags
1898                                            <h1>Tags</h1>
1899                                            (tag-list-to-html tags)))
1900                               :content-class "search-results-page" :current-uri "/search"
1901                               :title title))))))
1902
1903 (define-page view-login "/login" (return cookie-check
1904                                          (login-username :request-type :post) (login-password :request-type :post)
1905                                          (signup-username :request-type :post) (signup-email :request-type :post) (signup-password :request-type :post) (signup-password2 :request-type :post))
1906   (labels
1907     ((emit-login-page (&key error-message)
1908        (let ((csrf-token (make-csrf-token)))
1909          (emit-page (out-stream :title "Log in" :current-uri "/login" :content-class "login-page" :robots "noindex, nofollow")
1910                     (when error-message
1911                       (format out-stream "<div class=\"error-box\">~A</div>" error-message))
1912                     (with-outputs (out-stream) "<div class=\"login-container\">")
1913                     (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "login-form" "Log in" csrf-token
1914                                  '(("login-username" "Username" "text" "username")
1915                                    ("login-password" "Password" "password" "current-password"))
1916                                  "Log in"
1917                                  :end-html (when (typep *current-backend* 'backend-websocket-login) ;other backends not supported yet
1918                                              "<a href=\"/reset-password\">Forgot password</a>"))
1919                     (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "signup-form" "Create account" csrf-token
1920                                  '(("signup-username" "Username" "text" "username")
1921                                    ("signup-email" "Email" "text" "email")
1922                                    ("signup-password" "Password" "password" "new-password")
1923                                    ("signup-password2" "Confirm password" "password" "new-password"))
1924                                  "Create account")
1925                     (when-let (main-site-title (main-site-title *current-site*))
1926                       (when (typep *current-site* 'ea-forum-viewer-site)
1927                         <div class="error-box"><span style="font-weight:bold">WARNING:</span> EA Forum recently switched to a new single sign-on system. Accounts created with the new system do not currently work with GreaterWrong.\
1928                               Accounts created before the new system and accounts created through GreaterWrong continue to work.</div>)
1929                       (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>"
1930                               main-site-title))
1931                     (format out-stream "</div>"))))
1932      (finish-login (username user-id auth-token error-message &optional expires)
1933        (cond
1934          (auth-token
1935            (set-cookie "lw2-auth-token" auth-token :max-age (if expires (+ (- expires (get-unix-time)) (* 24 60 60)) (1- (expt 2 31))))
1936            (if expires (set-cookie "lw2-status" (json:encode-json-to-string (alist :expires expires))))
1937            (cache-put "auth-token-to-userid" auth-token user-id)
1938            (cache-put "auth-token-to-username" auth-token username)
1939            (redirect (if (and return (ppcre:scan "^/[^/]" return)) return "/")))
1940          (t
1941           (emit-login-page :error-message error-message)))))
1942     (cond
1943       ((not (or cookie-check (hunchentoot:cookie-in "session-token")))
1944         (set-cookie "session-token" (base64:usb8-array-to-base64-string (ironclad:make-random-salt)))
1945         (redirect (format nil "/login?~@[return=~A&~]cookie-check=y" (if return (url-rewrite:url-encode return)))))
1946       (cookie-check
1947         (if (hunchentoot:cookie-in "session-token")
1948             (redirect (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))))
1949             (emit-page (out-stream :title "Log in" :current-uri "/login")
1950                        (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))))))
1951       (login-username
1952         (cond
1953           ((or (string= login-username "") (string= login-password "")) (emit-login-page :error-message "Please enter a username and password"))
1954           ((lw2.dnsbl:dnsbl-check (hunchentoot:real-remote-addr)) (emit-login-page :error-message "Your IP address is blacklisted."))
1955           (t (multiple-value-call #'finish-login login-username (do-login login-username login-password)))))
1956       (signup-username
1957         (cond
1958           ((not (every (lambda (x) (not (string= x ""))) (list signup-username signup-email signup-password signup-password2)))
1959            (emit-login-page :error-message "Please fill in all fields"))
1960           ((not (string= signup-password signup-password2))
1961            (emit-login-page :error-message "Passwords do not match"))
1962           ((lw2.dnsbl:dnsbl-check (hunchentoot:real-remote-addr)) (emit-login-page :error-message "Your IP address is blacklisted."))
1963           (t (multiple-value-call #'finish-login signup-username (do-lw2-create-user signup-username signup-email signup-password)))))
1964       (t
1965        (emit-login-page)))))
1966
1967 (define-page view-logout "/logout" ()
1968   (request-method
1969    (:post ()
1970      (set-cookie "lw2-auth-token" "" :max-age 0)
1971      (do-logout *current-auth-token*)
1972      (redirect "/"))))
1973
1974 (defparameter *reset-password-template* (compile-template* "reset-password.html"))
1975
1976 (define-page view-reset-password "/reset-password" ((email :request-type :post) (reset-link :request-type :post) (password :request-type :post) (password2 :request-type :post))
1977   (labels ((emit-rpw-page (&key message message-type step)
1978              (let ((csrf-token (make-csrf-token)))
1979                (emit-page (out-stream :title "Reset password" :content-class "reset-password" :robots "noindex, nofollow")
1980                           (render-template* *reset-password-template* out-stream
1981                                             :csrf-token csrf-token
1982                                             :reset-link reset-link
1983                                             :message message
1984                                             :message-type message-type
1985                                             :step step)))))
1986     (cond
1987       (email
1988         (multiple-value-bind (ret error)
1989           (do-lw2-forgot-password email)
1990           (declare (ignore ret))
1991           (if error
1992               (emit-rpw-page :step 1 :message error :message-type "error")
1993               (emit-rpw-page :step 1 :message "Password reset email sent." :message-type "success"))))
1994       (reset-link
1995         (ppcre:register-groups-bind (reset-token) ("(?:reset-password/|^)([^/#]+)$" reset-link)
1996                                     (cond
1997                                       ((not reset-token)
1998                                        (emit-rpw-page :step 2 :message "Invalid password reset link." :message-type "error"))
1999                                       ((not (string= password password2))
2000                                        (emit-rpw-page :step 2 :message "Passwords do not match." :message-type "error"))
2001                                       (t
2002                                        (multiple-value-bind (user-id auth-token error-message) (do-lw2-reset-password reset-token password)
2003                                          (declare (ignore user-id auth-token))
2004                                          (cond
2005                                            (error-message (emit-rpw-page :step 2 :message error-message :message-type "error"))
2006                                            (t
2007                                             (with-error-page (emit-page (out-stream :title "Reset password" :content-class "reset-password")
2008                                                                         (format out-stream "<h1>Password reset complete</h1><p>You can now <a href=\"/login\">log in</a> with your new password.</p>"))))))))))
2009       (t
2010        (emit-rpw-page)))))
2011
2012 (define-page view-library "/library"
2013                             ((view :member '(:featured :community) :default :featured))
2014   (let ((sequences
2015          (lw2-graphql-query
2016           (lw2-query-string :sequence :list
2017                             (alist :view (case view
2018                                            (:featured "curatedSequences")
2019                                            (:community "communitySequences")))
2020                             :fields '(:--id :created-at :user-id :title :----typename)))))
2021     (view-items-index
2022      sequences
2023      :title "Sequences Library"
2024      :content-class "sequences-page"
2025      :current-uri "/library"
2026      :top-nav (lambda ()
2027                 (sublevel-nav-to-html '(:featured :community)
2028                                       view
2029                                       :default :featured
2030                                       :param-name "view"
2031                                       :extra-class "sequences-view")))))
2032
2033 (define-page view-sequence (:regex "^/s(?:equences)?/([^/?#]+)(?:/?$|\\?)" sequence-id) ()
2034   (let ((sequence (get-sequence sequence-id)))
2035     (alist-bind ((title string))
2036                 sequence
2037       (emit-page (out-stream
2038                   :title title
2039                   :content-class "sequence-page")
2040                  (sequence-to-html sequence)))))
2041
2042 (define-component view-collection (collection-id) ()
2043                   (let ((collection (get-collection collection-id)))
2044                     (renderer ()
2045                               (emit-page (out-stream :title (cdr (assoc :title collection)))
2046                                          (collection-to-html collection)))))
2047
2048 (define-component-routes lesswrong-viewer-site (view-sequences (standard-route :uri "/sequences") () (view-collection "oneQyj4pw77ynzwAF")))
2049 (define-component-routes lesswrong-viewer-site (view-codex (standard-route :uri "/codex") () (view-collection "2izXHCrmJ684AnZ5X")))
2050 (define-component-routes lesswrong-viewer-site (view-hpmor (standard-route :uri "/hpmor") () (view-collection "ywQvGBSojSQZTMpLh")))
2051 (define-component-routes ea-forum-viewer-site (view-handbook (standard-route :uri "/handbook") () (view-collection "MobebwWs2o86cS9Rd")))
2052
2053 (define-component-routes forum-site (view-tags-index (standard-route :uri "/tags") () (view-tags-index)))
2054
2055 (define-page view-archive (:regex "^/archive(?:/(\\d{4})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))"
2056                            (year :type (mod 10000))
2057                            (month :type (integer 1 12))
2058                            (day :type (integer 1 31)))
2059              ((offset :type fixnum :default 0))
2060   (local-time:with-decoded-timestamp (:day current-day :month current-month :year current-year :timezone local-time:+utc-zone+) (local-time:now)
2061     (local-time:with-decoded-timestamp (:day earliest-day :month earliest-month :year earliest-year :timezone local-time:+utc-zone+) (earliest-post-time)
2062       (labels ((url-elements (&rest url-elements)
2063                  (declare (dynamic-extent url-elements))
2064                  (format nil "/~{~A~^/~}" url-elements))
2065                (archive-nav ()
2066                  (let ((out-stream *html-output*))
2067                    (with-outputs (out-stream) "<div class=\"archive-nav\"><div class=\"archive-nav-years\">")
2068                    (link-if-not out-stream (not (or year month day)) (url-elements "archive") "archive-nav-item-year" "All")
2069                    (loop for y from earliest-year to current-year
2070                       do (link-if-not out-stream (eq y year) (url-elements "archive" y) "archive-nav-item-year" y))
2071                    (format out-stream "</div>")
2072                    (when year
2073                      (format out-stream "<div class=\"archive-nav-months\">")
2074                      (link-if-not out-stream (not month) (url-elements "archive" year) "archive-nav-item-month" "All")
2075                      (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)
2076                         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)))
2077                      (format out-stream "</div>"))
2078                    (when month
2079                      (format out-stream "<div class=\"archive-nav-days\">")
2080                      (link-if-not out-stream (not day) (url-elements "archive" year month) "archive-nav-item-day" "All")
2081                      (loop for d from (if (and (= (or year current-year) earliest-year) (= (or month current-month) earliest-month)) earliest-day 1)
2082                         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)))
2083                         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))
2084                      (format out-stream "</div>"))
2085                    (format out-stream "</div>"))))
2086         (multiple-value-bind (posts total)
2087           (lw2-graphql-query (lw2-query-string :post :list
2088                                                (alist :view (if day "new" "top") :limit 51 :offset offset
2089                                                       :after (if (and year (not day)) (format nil "~A-~A-~A" (or year earliest-year) (or month 1) (or day 1)))
2090                                                       :before (if year (format nil "~A-~A-~A" (or year current-year) (or month 12)
2091                                                                                (or day (local-time:days-in-month (or month 12) (or year current-year))))))))
2092           (emit-page (out-stream :title "Archive" :current-uri "/archive" :content-class "archive-page"
2093                                  :top-nav #'archive-nav
2094                                  :pagination (pagination-nav-bars :items-per-page 50 :offset offset :total total :with-next (if total nil (> (length posts) 50))))
2095                      (write-index-items-to-html out-stream (firstn posts 50) :empty-message "No posts for the selected period.")))))))
2096
2097 (define-page view-about "/about" ()
2098   (emit-page (out-stream :title "About" :current-uri "/about" :content-class "about-page")
2099              (alexandria:with-input-from-file (in-stream "www/about.html" :element-type '(unsigned-byte 8))
2100                                               (alexandria:copy-stream in-stream out-stream))))
2101
2102 (define-page misc-pages (:regex "^/misc-pages/.+") ()
2103   (let ((pathname (hunchentoot:request-pathname)))
2104     (unless (probe-file pathname)
2105       (error 'lw2-not-found-error))
2106     (emit-page (out-stream :title "Misc page" :content-class "misc-page")
2107                (alexandria:with-input-from-file (in-stream pathname :element-type '(unsigned-byte 8))
2108                  (alexandria:copy-stream in-stream out-stream)))))
2109
2110 (define-page view-generated-script (:regex "^/generated/([^/]+)\\.js" (name :type string)) ()
2111   (when-let ((package (find-package (string-upcase name))))
2112     (setf (hunchentoot:header-out "Content-Type") "text/javascript")
2113     (let ((stream (make-flexi-stream (hunchentoot:send-headers) :external-format :utf-8)))
2114       (write-package-client-scripts package stream))))
2115
2116 (hunchentoot:define-easy-handler
2117     (view-proxy-asset
2118      :uri (lambda (r)
2119             (with-error-page
2120               (multiple-value-bind (match? strings) (ppcre:scan-to-strings "^/proxy-assets/([0-9A-Za-z]+)(-inverted)?$" (hunchentoot:script-name r) :sharedp t)
2121                 (when-let* ((base-filename (and match? (svref strings 0)))
2122                             (image-data (cache-get "cached-images" base-filename :value-type :json)))
2123                   (let ((inverted (svref strings 1)))
2124                     (alist-bind ((mime-type simple-string)) image-data
2125                       (setf (hunchentoot:header-out "X-Content-Type-Options") "nosniff"
2126                             (hunchentoot:header-out "Cache-Control") #.(format nil "public, max-age=~A, immutable" 600))
2127                       (hunchentoot:handle-static-file (concatenate 'string "www/proxy-assets/" base-filename (if inverted "-inverted" "")) mime-type)
2128                       t)))))))
2129     nil)