lw2.lisp

   1 (uiop:define-package #:lw2-viewer
   2   (:use #:cl #:sb-thread #:flexi-streams #:djula
   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)
   4   (:import-from #:alexandria #:ensure-list)
   5   (:unintern
   6     #:define-regex-handler #:*fonts-stylesheet-uri* #:generate-fonts-link
   7     #:user-nav-bar #:*primary-nav* #:*secondary-nav* #:*nav-bars*
   8     #:begin-html #:end-html))
   9
  10 (in-package #:lw2-viewer)
  11
  12 (named-readtables:in-readtable html-reader)
  13
  14 (add-template-directory (asdf:system-relative-pathname "lw2-viewer" "templates/"))
  15
  16 (define-cache-database "auth-token-to-userid" "auth-token-to-username" "comment-markdown-source" "post-markdown-source")
  17
  18 (defvar *current-auth-token*)
  19 (defvar *current-userid*)
  20 (defvar *current-username*)
  21 (defvar *current-user-slug*)
  22
  23 (defvar *read-only-mode* nil)
  24 (defvar *read-only-default-message* "Due to a system outage, you cannot log in or post at this time.")
  25
  26 (defparameter *default-prefs* (alist :items-per-page 20 :default-sort "new"))
  27 (defvar *current-prefs* nil)
  28
  29 (defun logged-in-userid (&optional is-userid)
  30   (let ((current-userid *current-userid*))
  31     (if is-userid
  32         (string= current-userid is-userid)
  33         current-userid)))
  34
  35 (defun logged-in-username ()
  36   *current-username*)
  37
  38 (defun logged-in-user-slug ()
  39   *current-user-slug*)
  40
  41 (defun pretty-time (timestring &key format)
  42   (let ((time (local-time:parse-timestring timestring)))
  43   (values (local-time:format-timestring nil time :timezone local-time:+utc-zone+ :format (or format '(:day #\  :short-month #\  :year #\  :hour #\: (:min 2) #\  :timezone)))
  44           (* (local-time:timestamp-to-unix time) 1000))))
  45
  46 (defun pretty-number (number &optional object)
  47   (let ((str (coerce (format nil "~:D~@[<span> ~A~P</span>~]" number object number) '(vector character))))
  48     (if (eq (aref str 0) #\-)
  49       (setf (aref str 0) #\MINUS_SIGN))
  50     str))
  51
  52 (defun generate-post-auth-link (post &optional comment-id absolute need-auth)
  53   (if need-auth
  54       (concatenate 'string (generate-post-link post comment-id absolute) "?need-auth=y")
  55       (generate-post-link post comment-id absolute)))
  56
  57 (defun clean-lw-link (url)
  58   (when url
  59     (ppcre:regex-replace "([^/]*//[^/]*)lesserwrong\.com" url "\\1lesswrong.com")))
  60
  61 (defun votes-to-tooltip (votes)
  62   (if votes
  63       (format nil "~A vote~:*~P"
  64               (typecase votes (integer votes) (list (length votes))))
  65       ""))
  66
  67 (defun post-section-to-html (post &key skip-section)
  68   (alist-bind ((user-id string)
  69                (frontpage-date (or null string))
  70                (curated-date (or null string))
  71                (meta boolean)
  72                (af boolean)
  73                (draft boolean))
  74               post
  75               (multiple-value-bind (class title href)
  76                   (cond (af (if (eq skip-section :alignment-forum) nil (values "alignment-forum" "View Alignment Forum posts" "/index?view=alignment-forum")))
  77                                         ; show alignment forum even if skip-section is t
  78                         ((eq skip-section t) nil)
  79                         (draft nil)
  80                         (curated-date (if (eq skip-section :featured) nil (values "featured" "View Featured posts" "/index?view=featured")))
  81                         (frontpage-date (if (eq skip-section :frontpage) nil (values "frontpage" "View Frontpage posts" "/")))
  82                         (meta (if (eq skip-section :meta) nil (values "meta" "View Meta posts" "/index?view=meta")))
  83                         (t (if (eq skip-section :personal) nil (values "personal" (format nil "View posts by ~A" (get-username user-id)) (format nil "/users/~A?show=posts" (get-user-slug user-id))))))
  84                 <a class=("post-section ~A" class) title=title href=href></a>)))
  85
  86 (defun post-headline-to-html (post &key skip-section need-auth)
  87   (alist-bind ((post-id string :--id)
  88                (title string)
  89                (user-id string)
  90                (url (or null string))
  91                (posted-at string)
  92                (base-score fixnum)
  93                (comment-count (or null fixnum))
  94                (page-url (or null string))
  95                (word-count (or null fixnum))
  96                (frontpage-date (or null string))
  97                (curated-date (or null string))
  98                (meta boolean)
  99                (af boolean)
 100                (question boolean)
 101                (vote-count (or null fixnum))
 102                (draft boolean))
 103     post
 104     (multiple-value-bind (pretty-time js-time) (pretty-time posted-at)
 105       <h1 class=("listing~{ ~A~}" (list-cond
 106                                    (url "link-post-listing")
 107                                    (question "question-post-listing")
 108                                    ((logged-in-userid user-id) "own-post-listing")))>
 109         (if url <a href=(convert-any-link (string-trim " " url))>&#xf0c1;</a>)
 110         <a href=(generate-post-auth-link post nil nil need-auth)>
 111           (if question <span class="post-type-prefix">[Question] </span>)
 112           (safe (clean-text-to-html title))
 113         </a>
 114         (if (logged-in-userid user-id) <a class="edit-post-link button" href=("/edit-post?post-id=~A" post-id)</a>)
 115       </h1>
 116       <div class="post-meta">
 117         <a class=("author~{ ~A~}" (list-cond ((logged-in-userid user-id) "own-user-author")))
 118            href=("/users/~A" (get-user-slug user-id))
 119            data-userid=user-id>
 120           (get-username user-id)
 121         </a>
 122         <div class="date" data-js-date=js-time>(progn pretty-time)</div>
 123         <div class="karma">
 124           <span class="karma-value" title=(votes-to-tooltip vote-count)>(safe (pretty-number base-score "point"))</span>
 125         </div>
 126         <a class="comment-count" href=("~A#comments" (generate-post-link post))>(safe (pretty-number (or comment-count 0) "comment"))</a>
 127         (if word-count <span class="read-time" title=(safe (pretty-number word-count "word"))>(max 1 (round word-count 300))<span> min read</span></span>)
 128         (if page-url <a class="lw2-link" href=(clean-lw-link page-url)>(main-site-abbreviation *current-site*)<span> link</span></a>)
 129         (with-html-stream-output (post-section-to-html post :skip-section skip-section))
 130         (if url <div class="link-post-domain">("(~A)" (puri:uri-host (puri:parse-uri (string-trim " " url))))</div>)
 131       </div>)))
 132
 133 (defun post-body-to-html (post)
 134   (alist-bind ((post-id string :--id)
 135                (title string)
 136                (user-id string)
 137                (url (or null string))
 138                (posted-at string)
 139                (base-score fixnum)
 140                (tags (or null list))
 141                (comment-count (or null fixnum))
 142                (page-url (or null string))
 143                (frontpage-date (or null string))
 144                (curated-date (or null string))
 145                (meta boolean)
 146                (draft boolean)
 147                (af boolean)
 148                (question boolean)
 149                (vote-count (or null fixnum))
 150                (html-body (or null string)))
 151     post
 152     (multiple-value-bind (pretty-time js-time) (pretty-time posted-at)
 153       <div class=("post~{ ~A~}" (list-cond
 154                                  (url "link-post")
 155                                  (question "question-post")))>
 156         <h1 class="post-title">
 157           (if question <span class="post-type-prefix">[Question] </span>)
 158           (safe (clean-text-to-html title :hyphenation nil))
 159         </h1>
 160         <div class="post-meta">
 161           <a class=("author~{ ~A~}" (list-cond
 162                                      ((logged-in-userid user-id) "own-user-author")))
 163              href=("/users/~A" (get-user-slug user-id))
 164              data-userid=user-id>
 165             (get-username user-id)
 166           </a>
 167           <div class="date" data-js-date=js-time>(progn pretty-time)</div>
 168           <div class="karma" data-post-id=post-id>
 169             <span class="karma-value" title=(votes-to-tooltip vote-count)>(safe (pretty-number base-score "point"))</span>
 170           </div>
 171           <a class="comment-count" href="#comments">(safe (pretty-number (or comment-count 0) "comment"))</a>
 172           (if page-url <a class="lw2-link" href=(clean-lw-link page-url)>(main-site-abbreviation *current-site*)<span> link</span></a>)
 173           (with-html-stream-output (post-section-to-html post))
 174           (when tags
 175             <div id="tags">
 176               (dolist (tag tags) (alist-bind ((text string)) tag <a href=("/tags/~A" text)>(progn text)</a>))
 177             </div>)
 178         </div>
 179         <div class="post-body">
 180           (if url <p><a class="link-post-link" href=(convert-any-link (string-trim " " url))>Link post</a></p>)
 181           (with-html-stream-output
 182               (write-sequence (clean-html* (or html-body "") :with-toc t :post-id post-id) *html-output*))
 183         </div>
 184       </div>)))
 185
 186 (defparameter *comment-individual-link* nil)
 187
 188 (defun comment-to-html (out-stream comment &key with-post-title)
 189   (if (or (cdr (assoc :deleted comment)) (cdr (assoc :deleted-public comment)))
 190       (format out-stream "<div class=\"comment deleted-comment\"><div class=\"comment-meta\"><span class=\"deleted-meta\">[ ]</span></div><div class=\"comment-body\">[deleted]</div></div>")
 191       (alist-bind ((comment-id string :--id)
 192                    (user-id string)
 193                    (posted-at string)
 194                    (highlight-new boolean)
 195                    (post-id string)
 196                    (base-score fixnum)
 197                    (page-url (or null string))
 198                    (parent-comment list)
 199                    (parent-comment-id (or null string))
 200                    (child-count (or null fixnum))
 201                    (children list)
 202                    (vote-count (or null fixnum))
 203                    (retracted boolean)
 204                    (answer boolean)
 205                    (parent-answer-id (or null string))
 206                    (html-body string))
 207                   comment
 208                   (multiple-value-bind (pretty-time js-time) (pretty-time posted-at)
 209                     <div class=("comment~{ ~A~}"
 210                                 (list-cond
 211                                  ((and (logged-in-userid user-id)
 212                                        (< (* 1000 (local-time:timestamp-to-unix (local-time:now))) (+ js-time 15000)))
 213                                   "just-posted-comment")
 214                                  (highlight-new "comment-item-highlight")
 215                                  (retracted "retracted")))>
 216                       <div class="comment-meta">
 217                         <a class=("author~:[~; own-user-author~]" (logged-in-userid user-id))
 218                            href=("/users/~A" (encode-entities (get-user-slug user-id)))
 219                            data-userid=user-id>
 220                           (get-username user-id)
 221                         </a>
 222                         <a class="date" href=(generate-post-link post-id comment-id) data-js-date=js-time> (safe pretty-time) </a>
 223                         <div class="karma">
 224                           <span class="karma-value" title=(votes-to-tooltip vote-count)> (safe (pretty-number base-score "point")) </span>
 225                         </div>
 226                         <a class="permalink" href=("~A/~A/~A"
 227                                                    (generate-post-link post-id)
 228                                                    (cond ((or answer parent-answer-id) "answer") (t "comment"))
 229                                                    comment-id)
 230                            title="Permalink"></a>
 231                         (with-html-stream-output
 232                           (when page-url
 233                             <a class="lw2-link" href=(clean-lw-link page-url) title=(main-site-abbreviation *current-site*)></a>)
 234                           (if with-post-title
 235                               <div class="comment-post-title">
 236                                 (with-html-stream-output
 237                                     (when parent-comment
 238                                       (alist-bind ((user-id string)
 239                                                    (post-id string)
 240                                                    (parent-id string :--id))
 241                                                   parent-comment
 242                                         <span class="comment-in-reply-to">in reply to:
 243                                           <a href=("/users/~A" (get-user-slug user-id))
 244                                              class=("inline-author~:[~; own-user-author~]" (logged-in-userid user-id))
 245                                              data-userid=(progn user-id)>
 246                                              (get-username user-id)</a>'s
 247                                           <a href=(generate-post-link post-id parent-id)>comment</a>
 248                                           (progn " ")
 249                                         </span>)))
 250                                   <span class="comment-post-title2">on: <a href=(generate-post-link post-id)>(safe (clean-text-to-html (get-post-title post-id)))</a></span>
 251                                 </div>
 252                             (when parent-comment-id
 253                               (if *comment-individual-link*
 254                                   <a class="comment-parent-link" href=(progn parent-comment-id) title="Parent"></a>
 255                                   <a class="comment-parent-link" href=("#comment-~A" parent-comment-id)>Parent</a>)))
 256                           (when children
 257                             <div class="comment-child-links">
 258                               Replies:
 259                               (with-html-stream-output
 260                                 (dolist (child children)
 261                                   (alist-bind ((comment-id string)
 262                                                (user-id string))
 263                                               child
 264                                     <a href=("#comment-~A" comment-id)>(">~A" (get-username user-id))</a>)))
 265                             </div>)
 266                           <div class="comment-minimize-button"
 267                                data-child-count=(progn child-count)>
 268                           </div>)
 269                         </div>
 270                         <div class="comment-body" (safe ("~@[ data-markdown-source=\"~A\"~]"
 271                                                          (if (logged-in-userid user-id)
 272                                                              (encode-entities
 273                                                               (or (cache-get "comment-markdown-source" comment-id)
 274                                                                   html-body)))))>
 275                           (with-html-stream-output (write-sequence (clean-html* html-body) out-stream))
 276                         </div>
 277                       </div>))))
 278
 279 (defun postprocess-conversation-title (title)
 280   (if (or (null title) (string= title ""))
 281       "[Untitled conversation]"
 282       title))
 283
 284 (defun conversation-message-to-html (out-stream message)
 285   (alist-bind ((user-id string)
 286                (created-at string)
 287                (highlight-new boolean)
 288                (conversation list)
 289                (content list)
 290                (html-body (or string null)))
 291     message
 292     (multiple-value-bind (pretty-time js-time) (pretty-time created-at)
 293       (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</span><div class=\"comment-post-title\">Private message in: <a href=\"/conversation?id=~A\">~A</a></div></div><div class=\"comment-body\">"
 294               (if highlight-new " comment-item-highlight" "")
 295               (encode-entities (get-user-slug user-id))
 296               (encode-entities (get-username user-id))
 297               js-time
 298               pretty-time
 299               (encode-entities (cdr (assoc :--id conversation)))
 300               (encode-entities (postprocess-conversation-title (cdr (assoc :title conversation))))))
 301     (if html-body
 302         (write-sequence (clean-html* html-body) out-stream)
 303         (format out-stream "~{<p>~A</p>~}" (loop for block in (cdr (assoc :blocks content)) collect (encode-entities (cdr (assoc :text block))))))
 304     (format out-stream "</div></div>")))
 305
 306 (defun conversation-index-to-html (out-stream conversation)
 307   (alist-bind ((conversation-id string :--id)
 308                (title (or null string))
 309                (created-at (or null string))
 310                (participants list)
 311                (messages-total fixnum))
 312     conversation
 313     (multiple-value-bind (pretty-time js-time) (if created-at (pretty-time created-at) (values "[Error]" 0))
 314       (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</div></div>"
 315               (encode-entities conversation-id)
 316               (encode-entities (postprocess-conversation-title title))
 317               (loop for p in participants
 318                     collect (list (encode-entities (cdr (assoc :slug p))) (encode-entities (cdr (assoc :display-name p)))))
 319               (pretty-number messages-total "message")
 320               js-time
 321               pretty-time))))
 322
 323 (defun error-to-html (out-stream condition)
 324   (format out-stream "<div class=\"gw-error\"><h1>Error</h1><p>~A</p></div>"
 325           (encode-entities (princ-to-string condition))))
 326
 327 (defmacro with-error-html-block ((out-stream) &body body)
 328   "If an error occurs within BODY, write an HTML representation of the
 329 signaled condition to OUT-STREAM."
 330   `(handler-case
 331      (progn ,@body)
 332      (serious-condition (c) (error-to-html ,out-stream c))))
 333
 334 (defun make-comment-parent-hash (comments)
 335   (let ((existing-comment-hash (make-hash-table :test 'equal))
 336         (hash (make-hash-table :test 'equal)))
 337     (dolist (c comments)
 338       (alexandria:if-let (id (cdr (assoc :--id c)))
 339                          (setf (gethash id existing-comment-hash) t)))
 340     (dolist (c comments)
 341       (let* ((parent-id (cdr (assoc :parent-comment-id c)))
 342              (old (gethash parent-id hash)))
 343         (setf (gethash parent-id hash) (cons c old))
 344         (when (and parent-id (not (gethash parent-id existing-comment-hash)))
 345           (let ((placeholder (alist :--id parent-id :parent-comment-id nil :deleted t)))
 346             (setf (gethash parent-id existing-comment-hash) t
 347                   (gethash nil hash) (cons placeholder (gethash nil hash)))))))
 348     (maphash (lambda (k old)
 349                (setf (gethash k hash) (nreverse old)))
 350              hash)
 351     (labels
 352       ((count-children (parent)
 353         (let ((children (gethash (cdr (assoc :--id parent)) hash)))
 354           (+ (length children) (apply #'+ (map 'list #'count-children children)))))
 355        (add-child-counts (comment-list)
 356         (loop for c in comment-list
 357               as id = (cdr (assoc :--id c))
 358               do (setf (gethash id hash) (add-child-counts (gethash id hash)))
 359               collecting (cons (cons :child-count (count-children c)) c))))
 360       (setf (gethash nil hash) (add-child-counts (gethash nil hash))))
 361     hash))
 362
 363 (defun comment-thread-to-html (out-stream emit-comment-item-fn)
 364   (format out-stream "<ul class=\"comment-thread\">")
 365   (funcall emit-comment-item-fn)
 366   (format out-stream "</ul>"))
 367
 368 (defun comment-item-to-html (out-stream comment &key extra-html-fn)
 369   (with-error-html-block (out-stream)
 370     (let ((c-id (cdr (assoc :--id comment))))
 371       (format out-stream "<li id=\"comment-~A\" class=\"comment-item\">" c-id)
 372       (unwind-protect
 373         (comment-to-html out-stream comment)
 374         (if extra-html-fn (funcall extra-html-fn c-id))
 375         (format out-stream "</li>")))))
 376
 377 (defun comment-tree-to-html (out-stream comment-hash &optional (target nil) (level 0))
 378   (let ((comments (gethash target comment-hash)))
 379     (when comments
 380       (comment-thread-to-html out-stream
 381         (lambda ()
 382           (loop for c in comments do
 383                 (comment-item-to-html out-stream c
 384                   :extra-html-fn (lambda (c-id)
 385                                    (if (and (= level 10) (gethash c-id comment-hash))
 386                                        (format out-stream "<input type=\"checkbox\" id=\"expand-~A\"><label for=\"expand-~:*~A\" data-child-count=\"~A comment~:P\">Expand this thread</label>"
 387                                                c-id
 388                                                (cdr (assoc :child-count c))))
 389                                    (comment-tree-to-html out-stream comment-hash c-id (1+ level))))))))))
 390
 391 (defun comment-chrono-to-html (out-stream comments)
 392   (let ((comment-hash (make-comment-parent-hash comments))
 393         (comments-sorted (sort comments #'local-time:timestamp< :key (lambda (c) (local-time:parse-timestring (cdr (assoc :posted-at c)))))))
 394     (comment-thread-to-html out-stream
 395       (lambda ()
 396         (loop for c in comments-sorted do
 397               (let* ((c-id (cdr (assoc :--id c)))
 398                      (new-c (acons :children (gethash c-id comment-hash) c)))
 399                 (comment-item-to-html out-stream new-c)))))))
 400
 401 (defun comment-post-interleave (list &key limit offset (sort-by :date))
 402   (multiple-value-bind (sort-fn sort-key)
 403     (ecase sort-by
 404       (:date (values #'local-time:timestamp> (lambda (x) (local-time:parse-timestring (cdr (assoc :posted-at x))))))
 405       (:score (values #'> (lambda (x) (cdr (assoc :base-score x))))))
 406     (let ((sorted (sort list sort-fn :key sort-key)))
 407       (loop for end = (if (or limit offset) (+ (or limit 0) (or offset 0)))
 408             for x in sorted
 409             for count from 0
 410             until (and end (>= count end))
 411             when (or (not offset) (>= count offset))
 412             collect x))))
 413
 414 (defun write-index-items-to-html (out-stream items &key need-auth (empty-message "No entries.") skip-section)
 415   (if items
 416       (dolist (x items)
 417         (with-error-html-block (out-stream)
 418           (cond
 419             ((typep x 'condition)
 420              (error-to-html out-stream x))
 421             ((assoc :message x)
 422              (format out-stream "<p>~A</p>" (cdr (assoc :message x))))
 423             ((string= (cdr (assoc :----typename x)) "Message")
 424              (format out-stream "<ul class=\"comment-thread\"><li class=\"comment-item\">")
 425              (unwind-protect
 426                (conversation-message-to-html out-stream x)
 427                (format out-stream "</li></ul>")))
 428             ((string= (cdr (assoc :----typename x)) "Conversation")
 429              (conversation-index-to-html out-stream x))
 430             ((assoc :comment-count x)
 431              (post-headline-to-html x :need-auth need-auth :skip-section skip-section))
 432             (t
 433              (format out-stream "<ul class=\"comment-thread\"><li class=\"comment-item\" id=\"comment-~A\">" (cdr (assoc :--id x)))
 434              (unwind-protect
 435                (comment-to-html out-stream x :with-post-title t)
 436                (format out-stream "</li></ul>"))))))
 437       (format out-stream "<div class=\"listing-message\">~A</div>" empty-message)))
 438
 439 (defun write-index-items-to-rss (out-stream items &key title need-auth)
 440   (let ((full-title (format nil "~@[~A - ~]~A" title (site-title *current-site*))))
 441     (xml-emitter:with-rss2 (out-stream :encoding "UTF-8")
 442       (xml-emitter:rss-channel-header full-title (site-uri *current-site*) :description full-title)
 443       (labels ((emit-item (item &key title link (guid (cdr (assoc :--id item))) (author (get-username (cdr (assoc :user-id item))))
 444                                 (date (pretty-time (cdr (assoc :posted-at item)) :format local-time:+rfc-1123-format+)) body)
 445                           (xml-emitter:rss-item
 446                             title
 447                             :link link
 448                             :author author
 449                             :pubDate date
 450                             :guid guid
 451                             :description body)))
 452         (dolist (item items)
 453           (if (assoc :comment-count item)
 454             (let ((author (get-username (cdr (assoc :user-id item)))))
 455               (emit-item item
 456                          :title (clean-text (format nil "~A by ~A" (cdr (assoc :title item)) author))
 457                          :author author
 458                          :link (generate-post-auth-link item nil t need-auth)
 459                          :body (clean-html (or (cdr (assoc :html-body (get-post-body (cdr (assoc :--id item)) :revalidate nil))) "") :post-id (cdr (assoc :--id item)))))
 460             (emit-item item
 461                        :title (format nil "Comment by ~A on ~A" (get-username (cdr (assoc :user-id item))) (get-post-title (cdr (assoc :post-id item))))
 462                        :link (generate-post-link (cdr (assoc :post-id item)) (cdr (assoc :--id item)) t)
 463                        :body (clean-html (cdr (assoc :html-body item))))))))))
 464
 465 (defparameter *fonts-stylesheet-uris*
 466   '("https://fonts.greaterwrong.com/?fonts=InconsolataGW,CharterGW,ConcourseGW,Whitney,MundoSans,SourceSansPro,Raleway,ProximaNova,TiredOfCourier,AnonymousPro,InputSans,InputSansNarrow,InputSansCondensed,GaramondPremierPro,TriplicateCode,TradeGothic,NewsGothicBT,Caecilia,SourceSerifPro,SourceCodePro"
 467     "https://fonts.greaterwrong.com/?fonts=BitmapFonts,FontAwesomeGW&base64encode=1"))
 468 ;(defparameter *fonts-stylesheet-uris* '("https://fonts.greaterwrong.com/?fonts=*"))
 469
 470 (defvar *fonts-redirect-data* nil)
 471 (sb-ext:defglobal *fonts-redirect-lock* (make-mutex))
 472 (sb-ext:defglobal *fonts-redirect-thread* nil)
 473
 474 (defun generate-fonts-links ()
 475   (let ((current-time (get-unix-time)))
 476     (labels ((get-redirects (uri-list)
 477                (loop for request-uri in uri-list collect
 478                      (multiple-value-bind (body status headers uri)
 479                        (drakma:http-request request-uri :method :head :close t :redirect nil :additional-headers (alist :referer (site-uri (first *sites*)) :accept "text/css,*/*;q=0.1"))
 480                        (declare (ignore body uri))
 481                        (let ((location (cdr (assoc :location headers))))
 482                          (if (and (typep status 'integer) (< 300 status 400) location)
 483                              location
 484                              nil)))))
 485              (update-redirects ()
 486                (handler-case
 487                  (let* ((new-redirects (get-redirects *fonts-stylesheet-uris*))
 488                         (new-redirects (loop for new-redirect in new-redirects
 489                                              for original-uri in *fonts-stylesheet-uris*
 490                                              collect (if new-redirect (quri:render-uri (quri:merge-uris (quri:uri new-redirect) (quri:uri original-uri))) original-uri))))
 491                    (with-mutex (*fonts-redirect-lock*) (setf *fonts-redirect-data* (list *fonts-stylesheet-uris* new-redirects current-time)
 492                                                              *fonts-redirect-thread* nil))
 493                    new-redirects)
 494                  (serious-condition () *fonts-stylesheet-uris*)))
 495              (ensure-update-thread ()
 496                (with-mutex (*fonts-redirect-lock*)
 497                  (or *fonts-redirect-thread*
 498                      (setf *fonts-redirect-thread* (make-thread #'update-redirects :name "fonts redirect update"))))))
 499       (destructuring-bind (&optional base-uris redirect-uris timestamp) (with-mutex (*fonts-redirect-lock*) *fonts-redirect-data*)
 500         (if (and (eq base-uris *fonts-stylesheet-uris*) timestamp)
 501           (progn
 502             (if (>= current-time (+ timestamp 60))
 503                 (ensure-update-thread))
 504             (or redirect-uris *fonts-stylesheet-uris*))
 505           (update-redirects))))))
 506
 507 (defparameter *html-head*
 508   (format nil
 509 "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
 510 <meta name=\"HandheldFriendly\" content=\"True\" />"))
 511
 512 (defparameter *extra-external-scripts* "")
 513 (defparameter *extra-inline-scripts* "")
 514
 515 (defun generate-versioned-link (file)
 516   (format nil "~A?v=~A" file (sb-posix:stat-mtime (sb-posix:stat (format nil "www~A" file)))))
 517
 518 (defun search-bar-to-html (out-stream)
 519   (declare (special *current-search-query*))
 520   (let ((query (and (boundp '*current-search-query*) (hunchentoot:escape-for-html *current-search-query*))))
 521     (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*))))
 522
 523 (defun inbox-to-html (out-stream user-slug &optional new-messages)
 524   (let* ((target-uri (format nil "/users/~A?show=inbox" user-slug))
 525          (as-link (string= (hunchentoot:request-uri*) target-uri)))
 526     (multiple-value-bind (nm-class nm-text)
 527       (if new-messages (values "new-messages" "New messages") (values "no-messages" "Inbox"))
 528       (format out-stream "<~:[a href=\"~A\"~;span~*~] id=\"inbox-indicator\" class=\"~A\" accesskey=\"o\" title=\"~A~:[ [o]~;~]\">~A</a>"
 529               as-link target-uri nm-class nm-text as-link nm-text))))
 530
 531 (defmethod site-nav-bars ((site site))
 532   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 533                      ("about" "/about" "About" :accesskey "t")
 534                      ("search" "/search" "Search" :html search-bar-to-html)
 535                      user-nav-item))
 536     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 537                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 538
 539 (defmethod site-nav-bars ((site lesswrong-viewer-site))
 540   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 541                      ("about" "/about" "About" :accesskey "t")
 542                      ("search" "/search" "Search" :html search-bar-to-html)
 543                      user-nav-item))
 544     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 545                    ("featured" "/index?view=featured" "Featured" :description "Latest featured posts" :accesskey "f")
 546                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 547                    ("meta" "/index?view=meta" "Meta" :description "Latest meta posts" :accesskey "m")
 548                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 549
 550 (defmethod site-nav-bars ((site ea-forum-viewer-site))
 551   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 552                      ("about" "/about" "About" :accesskey "t")
 553                      ("search" "/search" "Search" :html search-bar-to-html)
 554                      user-nav-item))
 555     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 556                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 557                    ("meta" "/index?view=community" "Community" :description "Latest community posts" :accesskey "m")
 558                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 559
 560 (defun prepare-nav-bar (nav-bar current-uri)
 561   (list (first nav-bar)
 562         (map 'list (lambda (item) (if (listp item) item (funcall item current-uri)))
 563              (second nav-bar))))
 564
 565 (defun nav-item-active (item current-uri)
 566   (when item
 567     (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 568       (declare (ignore id name description html accesskey nofollow trailing-html))
 569       (string= (or override-uri uri) current-uri))))
 570
 571 (defun nav-bar-active (nav-bar current-uri)
 572   (some (lambda (x) (nav-item-active x current-uri)) (second nav-bar)))
 573
 574 (defun nav-bar-inner (out-stream items &optional current-uri)
 575   (maplist (lambda (items)
 576              (let ((item (first items)))
 577                (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 578                  (declare (ignore override-uri))
 579                  (let* ((item-active (nav-item-active item current-uri))
 580                         (nav-class (format nil "nav-item ~:[nav-inactive~;nav-current~]~:[~; nav-item-last-before-current~]"
 581                                            item-active (and (not item-active) (nav-item-active (cadr items) current-uri)))))
 582                      (format out-stream "<span id=\"nav-item-~A\" class=\"~A\" ~@[title=\"~A\"~]>"
 583                              id nav-class description)
 584                      (if html
 585                          (funcall html out-stream)
 586                          (link-if-not out-stream item-active uri "nav-inner" name :accesskey accesskey :nofollow nofollow))
 587                      (if trailing-html
 588                          (funcall trailing-html out-stream))
 589                      (format out-stream "</span>")))))
 590            items))
 591
 592 (defun nav-bar-outer (out-stream class nav-bar &optional current-uri)
 593   (format out-stream "<div id=\"~A\" class=\"nav-bar~@[ ~A~]\">" (string-downcase (first nav-bar)) class)
 594   (nav-bar-inner out-stream (second nav-bar) current-uri)
 595   (format out-stream "</div>"))
 596
 597 (defun nav-bar-to-html (out-stream &optional current-uri)
 598   (let* ((nav-bars (map 'list (lambda (x) (prepare-nav-bar x current-uri)) (site-nav-bars *current-site*)))
 599          (active-bar (or (find-if (lambda (x) (nav-bar-active x current-uri)) nav-bars) (car (last nav-bars))))
 600          (inactive-bars (remove active-bar nav-bars)))
 601     (dolist (bar inactive-bars)
 602       (nav-bar-outer out-stream "inactive-bar" bar current-uri))
 603     (nav-bar-outer out-stream "active-bar" active-bar current-uri)))
 604
 605 (defun user-nav-item (&optional current-uri)
 606   (if *read-only-mode*
 607       `("login" "/login" "Read Only Mode" :html ,(lambda () (format nil "<span class=\"nav-inner\" title=\"~A\">[Read Only Mode]</span>"
 608                                                                     (typecase *read-only-mode*
 609                                                                       (string *read-only-mode*)
 610                                                                       (t *read-only-default-message*)))))
 611       (alexandria:if-let (username (logged-in-username))
 612           (let ((user-slug (encode-entities (logged-in-user-slug))))
 613             `("login" ,(format nil "/users/~A" user-slug) ,(plump:encode-entities username) :description "User page" :accesskey "u"
 614               :trailing-html ,(lambda (out-stream) (inbox-to-html out-stream user-slug))))
 615           `("login" ,(format nil "/login?return=~A" (url-rewrite:url-encode current-uri)) "Log In" :accesskey "u" :nofollow t :override-uri "/login"))))
 616
 617 (defun sublevel-nav-to-html (out-stream options current &key default (base-uri (hunchentoot:request-uri*)) (param-name "show") (remove-params '("offset")) extra-class)
 618   (declare (type (or null string) extra-class))
 619   (format out-stream "<div class=\"sublevel-nav~@[ ~A~]\">" extra-class)
 620   (loop for item in options
 621         do (multiple-value-bind (param-value text) (if (atom item)
 622                                                        (values (string-downcase item) (string-capitalize item))
 623                                                        (values-list item))
 624              (let* ((selected (string-equal current param-value))
 625                     (class (if selected "sublevel-item selected" "sublevel-item")))
 626                (link-if-not out-stream selected (apply #'replace-query-params base-uri param-name (unless (string-equal param-value default) param-value)
 627                                                        (loop for x in remove-params nconc (list x nil)))
 628                             class text))))
 629   (format out-stream "</div>"))
 630
 631 (defun make-csrf-token (&optional (session-token (hunchentoot:cookie-in "session-token")) (nonce (ironclad:make-random-salt)))
 632   (if (typep session-token 'string) (setf session-token (base64:base64-string-to-usb8-array session-token)))
 633   (let ((csrf-token (concatenate '(vector (unsigned-byte 8)) nonce (ironclad:digest-sequence :sha256 (concatenate '(vector (unsigned-byte 8)) nonce session-token)))))
 634     (values (base64:usb8-array-to-base64-string csrf-token) csrf-token)))
 635
 636 (defun check-csrf-token (csrf-token &optional (session-token (hunchentoot:cookie-in "session-token")))
 637   (let* ((session-token (base64:base64-string-to-usb8-array session-token))
 638          (csrf-token (base64:base64-string-to-usb8-array csrf-token))
 639          (correct-token (nth-value 1 (make-csrf-token session-token (subseq csrf-token 0 16)))))
 640     (assert (ironclad:constant-time-equal csrf-token correct-token) nil "CSRF check failed.")
 641     t))
 642
 643 (defun generate-css-link ()
 644   (labels ((gen-inner (theme os)
 645              (generate-versioned-link (format nil "/css/style~@[-~A~].~A.css" (if (and theme (> (length theme) 0)) theme) os))))
 646     (let* ((ua (hunchentoot:header-in* :user-agent))
 647            (theme (hunchentoot:cookie-in "theme"))
 648            (os (cond ((search "Windows" ua) "windows")
 649                      ((search "Mac OS" ua) "mac")
 650                      (t "linux"))))
 651       (handler-case (gen-inner theme os)
 652         (serious-condition () (gen-inner nil os))))))
 653
 654 (defun html-body (out-stream fn &key title description current-uri content-class robots)
 655   (let* ((session-token (hunchentoot:cookie-in "session-token"))
 656          (csrf-token (and session-token (make-csrf-token session-token))))
 657     (format out-stream "<!DOCTYPE html><html lang=\"en-US\"><head>")
 658     (format out-stream "<script>window.GW = { }; loggedInUserId=\"~A\"; loggedInUserDisplayName=\"~A\"; loggedInUserSlug=\"~A\"; ~@[GW.csrfToken=\"~A\"; ~]~A</script>~A"
 659             (or (logged-in-userid) "")
 660             (or (logged-in-username) "")
 661             (or (logged-in-user-slug) "")
 662             csrf-token
 663             (load-time-value (with-open-file (s "www/head.js") (uiop:slurp-stream-string s)) t)
 664             *extra-inline-scripts*)
 665     (format out-stream "~A<link rel=\"stylesheet\" href=\"~A\">~{<link rel=\"stylesheet\" href=\"~A\">~}<link rel=\"shortcut icon\" href=\"~A\">"
 666             *html-head*
 667             (generate-css-link)
 668             (generate-fonts-links)
 669             (generate-versioned-link "/assets/favicon.ico"))
 670     (format out-stream "<script src=\"~A\" async></script>~A"
 671             (generate-versioned-link "/script.js")
 672             *extra-external-scripts*)
 673     (format out-stream "<title>~@[~A - ~]~A</title>~@[<meta name=\"description\" content=\"~A\">~]~@[<meta name=\"robots\" content=\"~A\">~]"
 674             (if title (encode-entities title))
 675             (site-title *current-site*)
 676             description
 677             robots)
 678     (format out-stream "</head>"))
 679   (unwind-protect
 680     (progn
 681       (format out-stream "<body><div id=\"content\"~@[ class=\"~A\"~]>"
 682               content-class)
 683       (nav-bar-to-html out-stream (or current-uri (replace-query-params (hunchentoot:request-uri*) "offset" nil "sort" nil)))
 684       (force-output out-stream)
 685       (funcall fn))
 686     (format out-stream "</div></body></html>")))
 687
 688 (defun replace-query-params (uri &rest params)
 689   (let* ((quri (quri:uri uri))
 690          (old-params (quri:uri-query-params quri))
 691          (new-params (loop with out = old-params
 692                            for (param value) on params by #'cddr
 693                            do (if value
 694                                   (alexandria:if-let (old-cons (assoc param out :test #'equal))
 695                                                      (setf (cdr old-cons) value)
 696                                                      (setf out (nconc out (list (cons param value)))))
 697                                   (setf out (remove-if (lambda (x) (equal (car x) param)) out)))
 698                            finally (return out))))
 699     (if new-params
 700       (setf (quri:uri-query-params quri) new-params)
 701       (setf (quri:uri-query quri) nil))
 702     (quri:render-uri quri)))
 703
 704 (defun pagination-nav-bars (&key offset total with-next (items-per-page (user-pref :items-per-page)))
 705   (lambda (out-stream fn)
 706     (labels ((pages-to-end (n) (< (+ offset (* items-per-page n)) total)))
 707       (let* ((with-next (if total (pages-to-end 1) with-next))
 708              (next (if (and offset with-next) (+ offset items-per-page)))
 709              (prev (if (and offset (>= offset items-per-page)) (- offset items-per-page)))
 710              (request-uri (hunchentoot:request-uri*))
 711              (first-uri (if (and prev (> prev 0)) (replace-query-params request-uri "offset" nil)))
 712              (prev-uri (if prev (replace-query-params request-uri "offset" (if (= prev 0) nil prev))))
 713              (next-uri (if next (replace-query-params request-uri "offset" next)))
 714              (last-uri (if (and total offset (pages-to-end 2))
 715                            (replace-query-params request-uri "offset" (- total (mod (- total 1) items-per-page) 1)))))
 716         (if (or next prev last-uri)
 717           (labels ((write-item (uri class title accesskey)
 718                      (format out-stream "<a href=\"~A\" class=\"button nav-item-~A~:[ disabled~;~]\" title=\"~A [~A]\" accesskey=\"~A\"></a>"
 719                              (or uri "#") class uri title accesskey accesskey)))
 720             (format out-stream "<div id='top-nav-bar'>")
 721             (write-item first-uri "first" "First page" "\\")
 722             (write-item prev-uri "prev" "Previous page" "[")
 723             (format out-stream "<span class='page-number'><span class='page-number-label'>Page</span> ~A</span>" (+ 1 (/ (or offset 0) items-per-page)))
 724             (write-item next-uri "next" "Next page" "]")
 725             (write-item last-uri "last" "Last page" "/")
 726             (format out-stream "</div>")))
 727         (funcall fn)
 728         (nav-bar-outer out-stream nil (list :bottom-bar
 729                                             (list-cond
 730                                              (first-uri `("first" ,first-uri "Back to first"))
 731                                              (prev-uri `("prev" ,prev-uri "Previous" :nofollow t))
 732                                              (t `("top" "#top" "Back to top"))
 733                                              (next-uri `("next" ,next-uri "Next" :nofollow t))
 734                                              (last-uri `("last" ,last-uri "Last" :nofollow t)))))
 735         (format out-stream "<script>document.querySelectorAll('#bottom-bar').forEach(bb => { bb.classList.add('decorative'); });</script>")))))
 736
 737 (defun map-output (out-stream fn list)
 738   (loop for item in list do (write-string (funcall fn item) out-stream)))
 739
 740 (defmacro with-outputs ((out-stream) &body body)
 741   (alexandria:with-gensyms (stream-sym)
 742                            (let ((out-body (map 'list (lambda (x) `(princ ,x ,stream-sym)) body)))
 743                              `(let ((,stream-sym ,out-stream))
 744                                 ,.out-body))))
 745
 746 (defun call-with-emit-page (out-stream fn &key title description current-uri content-class (return-code 200) robots (pagination (pagination-nav-bars)) top-nav)
 747   (declare (ignore return-code))
 748   (ignore-errors
 749     (log-conditions
 750       (html-body out-stream
 751                  (lambda ()
 752                    (when top-nav (funcall top-nav out-stream))
 753                    (funcall pagination out-stream fn))
 754                  :title title :description description :current-uri current-uri :content-class content-class :robots robots)
 755       (force-output out-stream))))
 756
 757 (defun set-cookie (key value &key (max-age (- (expt 2 31) 1)) (path "/"))
 758   (hunchentoot:set-cookie key :value value :path path :max-age max-age :secure (site-secure *current-site*)))
 759
 760 (defun set-default-headers (return-code)
 761   (let ((push-option (if (hunchentoot:cookie-in "push") '("nopush"))))
 762     (setf (hunchentoot:content-type*) "text/html; charset=utf-8"
 763           (hunchentoot:return-code*) return-code
 764           (hunchentoot:header-out :link) (format nil "~:{<~A>;rel=preload;type=~A;as=~A~@{;~A~}~:^,~}"
 765                                                  `((,(generate-css-link) "text/css" "style" ,.push-option)
 766                                                    ,.(loop for link in (generate-fonts-links)
 767                                                            collect (list* link "text/css" "style" push-option))
 768                                                    (,(generate-versioned-link "/script.js") "text/javascript" "script" ,.push-option))))
 769     (unless push-option (set-cookie "push" "t" :max-age (* 4 60 60)))))
 770
 771 (defun user-pref (key)
 772   (or (cdr (assoc key *current-prefs*))
 773       (cdr (assoc key *default-prefs*))))
 774
 775 (defun set-user-pref (key value)
 776   (assert (boundp 'hunchentoot:*reply*))
 777   (setf *current-prefs* (remove-duplicates (acons key value *current-prefs*) :key #'car :from-end t))
 778   (set-cookie "prefs" (quri:url-encode (json:encode-json-to-string *current-prefs*))))
 779
 780 (defmacro with-response-stream ((out-stream) &body body) `(call-with-response-stream (lambda (,out-stream) ,.body)))
 781
 782 (defun call-with-response-stream (fn)
 783   (let ((*html-output* (make-flexi-stream (hunchentoot:send-headers) :external-format :utf-8)))
 784     (funcall fn *html-output*)))
 785
 786 (defmacro emit-page ((out-stream &rest args &key (return-code 200) &allow-other-keys) &body body)
 787   (alexandria:once-only (return-code)
 788     `(progn
 789        (set-default-headers ,return-code)
 790        (with-response-stream (,out-stream)
 791          (call-with-emit-page ,out-stream
 792                               (lambda () ,@body)
 793                               ,@args)))))
 794
 795 (defun call-with-error-page (fn)
 796   (let* ((lw2-status
 797            (alexandria:if-let (status-string (hunchentoot:cookie-in "lw2-status"))
 798              (if (string= status-string "") nil
 799                  (let ((json:*identifier-name-to-key* #'json:safe-json-intern))
 800                    (json:decode-json-from-string status-string)))))
 801          (*current-prefs*
 802            (alexandria:if-let (prefs-string (hunchentoot:cookie-in "prefs"))
 803              (let ((json:*identifier-name-to-key* 'json:safe-json-intern))
 804                (ignore-errors (json:decode-json-from-string (quri:url-decode prefs-string)))))))
 805     (with-site-context ((let ((host (or (hunchentoot:header-in* :x-forwarded-host) (hunchentoot:header-in* :host))))
 806                           (or (find-site host)
 807                               (error "Unknown site: ~A" host))))
 808       (multiple-value-bind (*current-auth-token* *current-userid* *current-username*)
 809         (if *read-only-mode*
 810             (values)
 811             (alexandria:if-let
 812               (auth-token
 813                 (alexandria:if-let
 814                   (at (hunchentoot:cookie-in "lw2-auth-token"))
 815                   (if (or (string= at "") (not lw2-status) (> (get-unix-time) (- (cdr (assoc :expires lw2-status)) (* 60 60 24))))
 816                       nil at)))
 817               (with-cache-readonly-transaction
 818                 (values
 819                   auth-token
 820                   (cache-get "auth-token-to-userid" auth-token)
 821                   (cache-get "auth-token-to-username" auth-token)))))
 822         (let ((*current-user-slug* (and *current-userid* (get-user-slug *current-userid*))))
 823           (handler-case
 824             (log-conditions
 825               (funcall fn))
 826             (serious-condition (condition)
 827               (emit-page (out-stream :title "Error" :return-code (condition-http-return-code condition) :content-class "error-page")
 828                          (error-to-html out-stream condition)))))))))
 829
 830 (defmacro with-error-page (&body body)
 831   `(call-with-error-page (lambda () ,@body)))
 832
 833 (defun output-form (out-stream method action id heading csrf-token fields button-label &key textarea end-html)
 834   (format out-stream "<form method=\"~A\" action=\"~A\" id=\"~A\"><h1>~A</h1>" method action id heading)
 835   (loop for (id label type . params) in fields
 836         do (format out-stream "<label for=\"~A\">~A:</label>" id label)
 837         do (cond
 838              ((string= type "select")
 839               (destructuring-bind (option-list &optional default) params
 840                 (format out-stream "<select name=\"~A\">" id)
 841                 (loop for (value label) in option-list
 842                       do (format out-stream "<option value=\"~A\"~:[~; selected~]>~A</option>" value (string= default value) label))
 843                 (format out-stream "</select>")))
 844              (t
 845                (destructuring-bind (&optional (autocomplete "off") default) params
 846                  (format out-stream "<input type=\"~A\" name=\"~A\" autocomplete=\"~A\"~@[ value=\"~A\"~]>" type id autocomplete (and default (encode-entities default))))))
 847         do (format out-stream ""))
 848   (if textarea
 849     (destructuring-bind (ta-name ta-contents) textarea
 850       (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))))
 851   (format out-stream "<input type=\"hidden\" name=\"csrf-token\" value=\"~A\"><input type=\"submit\" value=\"~A\">~@[~A~]</form>"
 852           csrf-token button-label end-html))
 853
 854 (defun page-toolbar-to-html (out-stream &key title new-post new-conversation logout (rss t))
 855   (let ((liu (logged-in-userid)))
 856     (format out-stream "<div class=\"page-toolbar\">")
 857     (when logout
 858       (format out-stream "<form method=\"post\" action=\"/logout\"><button class=\"logout-button button\" name=\"logout\" value=\"~A\">Log out</button></form>"
 859               (make-csrf-token)))
 860     (when (and new-conversation liu)
 861       (multiple-value-bind (text to)
 862         (typecase new-conversation (string (values "Send private message" new-conversation)) (t "New conversation"))
 863         (format out-stream "<a class=\"new-private-message button\" href=\"/conversation~@[?to=~A~]\">~A</a>"
 864                 to text)))
 865     (when (and new-post liu)
 866       (format out-stream "<a class=\"new-post button\" href=\"/edit-post~@[?section=~A~]\" accesskey=\"n\" title=\"Create new post [n]\">New post</a>"
 867               (typecase new-post (string new-post) (t nil))))
 868     (when (and title rss)
 869       (format out-stream "<a class=\"rss\" rel=\"alternate\" type=\"application/rss+xml\" title=\"~A RSS feed\" href=\"~A\">RSS</a>"
 870               title (replace-query-params (hunchentoot:request-uri*) "offset" nil "format" "rss")))
 871     (format out-stream "</div>")))
 872
 873 (defun view-items-index (items &key section title current-uri hide-title need-auth (pagination (pagination-nav-bars)) (top-nav (lambda (s) (page-toolbar-to-html s :title title))) (content-class "index-page"))
 874   (alexandria:switch ((hunchentoot:get-parameter "format") :test #'string=)
 875                      ("rss"
 876                       (setf (hunchentoot:content-type*) "application/rss+xml; charset=utf-8")
 877                       (with-response-stream (out-stream)
 878                         (write-index-items-to-rss out-stream items :title title)))
 879                      (t
 880                        (emit-page (out-stream :title (if hide-title nil title) :description (site-description *current-site*) :content-class content-class
 881                                               :current-uri current-uri :robots (if (hunchentoot:get-parameter :offset) "noindex, nofollow")
 882                                               :pagination pagination :top-nav top-nav)
 883                                   (write-index-items-to-html out-stream items
 884                                                              :need-auth need-auth
 885                                                              :skip-section section)))))
 886
 887 (defun link-if-not (stream linkp url class text &key accesskey nofollow)
 888   (declare (dynamic-extent linkp url text))
 889   (if (not linkp)
 890       (format stream "<a href=\"~A\" class=\"~A\"~@[ accesskey=\"~A\"~]~:[~; rel=\"nofollow\"~]>~A</a>" url class accesskey nofollow text)
 891       (format stream "<span class=\"~A\">~A</span>" class text)))
 892
 893 (defun postprocess-markdown (markdown)
 894   (when (typep *current-site* 'alternate-frontend-site)
 895     (ppcre:regex-replace-all
 896      (concatenate 'string (ppcre:regex-replace-all "\\." (site-uri *current-site*) "\\.") "posts/([^/ ]{17})/([^/# ]*)(?:#comment-([^/ ]{17})|/comment/([^/ ]{17}))?")
 897      markdown
 898      (lambda (target-string start end match-start match-end reg-starts reg-ends)
 899        (declare (ignore start end match-start match-end))
 900        (labels ((reg (n) (if (and (> (length reg-starts) n) (aref reg-starts n))
 901                              (substring target-string (aref reg-starts n) (aref reg-ends n)))))
 902          (quri:render-uri
 903           (quri:merge-uris
 904            (format nil "/posts/~A/~A~@[#~A~]" (reg 0) (reg 1) (or (reg 2) (reg 3)))
 905            (main-site-uri *current-site*))))))))
 906
 907 (defun redirect (uri &key (type :see-other))
 908   (setf (hunchentoot:return-code*) (ecase type (:see-other 303) (:permanent 301))
 909         (hunchentoot:header-out "Location") uri))
 910
 911 (defmacro ignorable-multiple-value-bind ((&rest bindings) value-form &body body)
 912   (let (new-bindings ignores)
 913     (dolist (binding (reverse bindings))
 914       (if (eq binding '*)
 915           (let ((gensym (gensym)))
 916             (push gensym new-bindings)
 917             (push gensym ignores))
 918           (push binding new-bindings)))
 919     `(multiple-value-bind ,new-bindings ,value-form
 920          (declare (ignore ,.ignores))
 921        ,@body)))
 922
 923 (defmacro define-page (name path-specifier additional-vars &body body)
 924   (labels ((make-lambda (args)
 925              (loop for a in args
 926                    collect (if (atom a) a (first a))))
 927            (filter-plist (plist &rest args)
 928              (declare (dynamic-extent args))
 929              (map-plist (lambda (key val) (when (member key args) (list key val))) plist)))
 930    (multiple-value-bind (path-specifier-form path-bindings-wrapper specifier-vars)
 931     (if (stringp path-specifier)
 932         (values path-specifier #'identity)
 933         (destructuring-bind (specifier-type specifier-body &rest specifier-args) path-specifier
 934           (ecase specifier-type
 935             (:function
 936               (values `(lambda (r) (funcall ,specifier-body (hunchentoot:request-uri r)))
 937                       (if specifier-args
 938                           (lambda (body) `(ignorable-multiple-value-bind ,(make-lambda specifier-args) (funcall ,specifier-body (hunchentoot:request-uri*)) ,body))
 939                           #'identity)
 940                       specifier-args))
 941             (:regex
 942               (let ((fn `(lambda (r) (ppcre:scan-to-strings ,specifier-body (hunchentoot:request-uri r)))))
 943                 (values fn
 944                         (lambda (body)
 945                           (alexandria:with-gensyms (result-vector)
 946                             `(let ((,result-vector (nth-value 1 (funcall ,fn hunchentoot:*request*))))
 947                                (declare (type simple-vector ,result-vector))
 948                                (let
 949                                  ,(loop for v in (make-lambda specifier-args) as x from 0 collecting `(,v (if (> (length ,result-vector) ,x) (aref ,result-vector ,x))))
 950                                  ,body))))
 951                         specifier-args))))))
 952      (let* ((rewritten-body
 953              (if (eq (ignore-errors (caar body)) 'request-method)
 954                  (progn
 955                    (unless (= (length body) 1)
 956                      (error "REQUEST-METHOD must be the only form when it appears in DEFINE-PAGE."))
 957                    `((ecase (hunchentoot:request-method*)
 958                        ,.(loop for method-body in (cdar body)
 959                             collect (destructuring-bind (method args &body inner-body) method-body
 960                                       (unless (eq method :get)
 961                                         (alexandria:with-gensyms (csrf-token)
 962                                           (push `(,csrf-token :real-name "csrf-token" :required t) args)
 963                                           (push `(check-csrf-token ,csrf-token) inner-body)))
 964                                       `(,method ,(make-binding-form (mapcar (lambda (x) (append (ensure-list x) `(:request-type ,method))) args)
 965                                                                     inner-body)))))))
 966                  body)))
 967        `(hunchentoot:define-easy-handler (,name :uri ,path-specifier-form) ()
 968           (with-error-page
 969               (block nil
 970                 ,(funcall path-bindings-wrapper
 971                           (make-binding-form (append (mapcar (lambda (x) (append (ensure-list x) '(:passthrough t))) specifier-vars) additional-vars)
 972                                              rewritten-body)))))))))
 973
 974 (define-component sort-widget (&key (sort-options '(:new :hot)) (pref :default-sort) (param-name "sort") (html-class "sort"))
 975   (:http-args '((sort :real-name param-name :member sort-options)))
 976   (let ((sort-string (if sort (string-downcase sort))))
 977     (if sort-string
 978         (set-user-pref :default-sort sort-string))
 979     (renderer (out-stream)
 980       (sublevel-nav-to-html out-stream
 981                             sort-options
 982                             (user-pref pref)
 983                             :param-name param-name
 984                             :extra-class html-class))
 985     (or sort-string (user-pref pref))))
 986
 987 (define-page view-root "/" ((offset :type fixnum)
 988                             (limit :type fixnum))
 989   (component-value-bind ((sort-string sort-widget))
 990     (multiple-value-bind (posts total)
 991       (get-posts-index :offset offset :limit (or limit (user-pref :items-per-page)) :sort sort-string)
 992       (view-items-index posts
 993                         :section :frontpage :title "Frontpage posts" :hide-title t
 994                         :pagination (pagination-nav-bars :offset (or offset 0) :total total :with-next (not total))
 995                         :top-nav (lambda (out-stream)
 996                                    (page-toolbar-to-html out-stream
 997                                                          :title "Frontpage posts"
 998                                                          :new-post t)
 999                                    (funcall sort-widget out-stream))))))
1000
1001 (define-page view-index "/index" ((view :member '(:all :new :frontpage :featured :meta :community :alignment-forum :questions) :default :all)
1002                                   before after
1003                                   (offset :type fixnum)
1004                                   (limit :type fixnum))
1005   (when (eq view :new) (redirect (replace-query-params (hunchentoot:request-uri*) "view" "all" "all" nil) :type :permanent) (return))
1006   (component-value-bind ((sort-string sort-widget))
1007     (multiple-value-bind (posts total)
1008       (get-posts-index :view (string-downcase view) :before before :after after :offset offset :limit (or limit (user-pref :items-per-page)) :sort sort-string)
1009       (let ((page-title (format nil "~@(~A posts~)" view)))
1010         (view-items-index posts
1011                           :section view :title page-title
1012                           :pagination (pagination-nav-bars :offset (or offset 0) :total total :with-next (not total))
1013                           :content-class (format nil "index-page ~(~A~)-index-page" view)
1014                           :top-nav (lambda (out-stream)
1015                                      (page-toolbar-to-html out-stream
1016                                                            :title page-title
1017                                                            :new-post (if (eq view :meta) "meta" t))
1018                                      (if (member view '(:all))
1019                                          (funcall sort-widget out-stream))))))))
1020
1021 (define-page view-post "/post" ((id :required t))
1022   (redirect (generate-post-link id) :type :permanent))
1023
1024 (define-page view-post-lw1-link (:function #'match-lw1-link) ()
1025   (redirect (convert-lw1-link (hunchentoot:request-uri*)) :type :permanent))
1026
1027 (define-page view-post-lw2-slug-link (:function #'match-lw2-slug-link) ()
1028   (redirect (convert-lw2-slug-link (hunchentoot:request-uri*)) :type :see-other))
1029
1030 (define-page view-post-lw2-sequence-link (:function #'match-lw2-sequence-link) ()
1031   (redirect (convert-lw2-sequence-link (hunchentoot:request-uri*)) :type :see-other))
1032
1033 (define-page view-feed "/feed" ()
1034   (redirect "/?format=rss" :type :permanent))
1035
1036 (define-page view-post-lw2-link (:function #'match-lw2-link post-id comment-id * comment-link-type) (need-auth chrono)
1037   (request-method
1038     (:get ()
1039      (let ((lw2-auth-token *current-auth-token*))
1040        (labels ((output-comments (out-stream id comments target)
1041                   (format out-stream "<div id=\"~A\" class=\"comments\">" id)
1042                   (with-error-html-block (out-stream)
1043                     (if target
1044                         (comment-thread-to-html out-stream
1045                                                 (lambda ()
1046                                                   (comment-item-to-html
1047                                                     out-stream
1048                                                     target
1049                                                     :extra-html-fn (lambda (c-id)
1050                                                                      (let ((*comment-individual-link* nil))
1051                                                                        (comment-tree-to-html out-stream (make-comment-parent-hash comments) c-id))))))
1052                         (if comments
1053                             (if chrono
1054                                 (comment-chrono-to-html out-stream comments)
1055                                 (comment-tree-to-html out-stream (make-comment-parent-hash comments)))
1056                             <div class="comments-empty-message">(if (string= id "answers") "No answers." "No comments.")</div>)))
1057                   (format out-stream "</div>"))
1058                 (output-comments-votes (out-stream)
1059                   (handler-case
1060                     (when lw2-auth-token
1061                       (format out-stream "<script>commentVotes=~A</script>"
1062                               (json:encode-json-to-string (get-post-comments-votes post-id lw2-auth-token))))
1063                     (t () nil)))
1064                 (output-post-vote (out-stream)
1065                   (handler-case
1066                     (format out-stream "<script>postVote=~A</script>"
1067                             (json:encode-json-to-string (get-post-vote post-id lw2-auth-token)))
1068                     (t () nil))))
1069          (multiple-value-bind (post title condition)
1070            (handler-case (nth-value 0 (get-post-body post-id :auth-token (and need-auth lw2-auth-token)))
1071              (serious-condition (c) (values nil "Error" c))
1072              (:no-error (post) (values post (cdr (assoc :title post)) nil)))
1073            (if comment-id
1074                (let* ((*comment-individual-link* t)
1075                       (comment-thread-type (if (string= comment-link-type "answer") :answer :comment))
1076                       (comments (case comment-thread-type
1077                                   (:comment (get-post-comments post-id))
1078                                   (:answer (get-post-answers post-id))))
1079                       (target-comment (find comment-id comments :key (lambda (c) (cdr (assoc :--id c))) :test #'string=))
1080                       (display-name (get-username (cdr (assoc :user-id target-comment))))
1081                       (verb-phrase (cond
1082                                      ((and (eq comment-thread-type :answer)
1083                                            (not (cdr (assoc :parent-comment-id target-comment))))
1084                                       "answers")
1085                                      (t "comments on"))))
1086                  (emit-page (out-stream :title (format nil "~A ~A ~A" display-name verb-phrase title)
1087                                         :content-class "individual-thread-page comment-thread-page")
1088                             (format out-stream "<h1 class=\"post-title\">~A ~A <a href=\"~A\">~A</a></h1>"
1089                                     (encode-entities display-name)
1090                                     verb-phrase
1091                                     (generate-post-link post-id)
1092                                     (clean-text-to-html title :hyphenation nil))
1093                             (output-comments out-stream "comments" comments target-comment)
1094                             (when lw2-auth-token
1095                               (force-output out-stream)
1096                               (output-comments-votes out-stream))))
1097              (emit-page (out-stream :title title :content-class (format nil "post-page comment-thread-page~:[~; question-post-page~]" (cdr (assoc :question post))))
1098                         (cond
1099                           (condition
1100                             (error-to-html out-stream condition))
1101                           (t
1102                            (post-body-to-html post)))
1103                         (when (and lw2-auth-token (equal (logged-in-userid) (cdr (assoc :user-id post))))
1104                           (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>"
1105                                   (cdr (assoc :--id post))))
1106                         (force-output out-stream)
1107                         (handler-case
1108                             (let* ((question (cdr (assoc :question post)))
1109                                    (answers (when question
1110                                               (get-post-answers post-id)))
1111                                    (comments (get-post-comments post-id)))
1112                               (when question
1113                                 (output-comments out-stream "answers" answers nil))
1114                               (output-comments out-stream "comments" comments nil))
1115                           (serious-condition (c) (error-to-html out-stream c)))
1116                         (when lw2-auth-token
1117                           (force-output out-stream)
1118                           (output-post-vote out-stream)
1119                           (output-comments-votes out-stream))))))))
1120     (:post (csrf-token text answer parent-answer-id parent-comment-id edit-comment-id retract-comment-id unretract-comment-id delete-comment-id)
1121      (let ((lw2-auth-token *current-auth-token*))
1122        (check-csrf-token csrf-token)
1123        (assert lw2-auth-token)
1124        (let ((question (cdr (assoc :question (get-post-body post-id :auth-token lw2-auth-token))))
1125              (new-comment-id
1126               (cond
1127                 (text
1128                  (let ((comment-data
1129                         (list-cond
1130                          (t :body (postprocess-markdown text))
1131                          (t :last-edited-as "markdown")
1132                          ((not edit-comment-id) :post-id post-id)
1133                          (parent-comment-id :parent-comment-id parent-comment-id)
1134                          (answer :answer t)
1135                          (parent-answer-id :parent-answer-id parent-answer-id))))
1136                    (if edit-comment-id
1137                        (prog1 edit-comment-id
1138                          (do-lw2-comment-edit lw2-auth-token edit-comment-id comment-data))
1139                        (do-lw2-comment lw2-auth-token comment-data))))
1140                 (retract-comment-id
1141                  (do-lw2-comment-edit lw2-auth-token retract-comment-id '((:retracted . t))))
1142                 (unretract-comment-id
1143                  (do-lw2-comment-edit lw2-auth-token unretract-comment-id '((:retracted . nil))))
1144                 (delete-comment-id
1145                  (do-lw2-comment-edit lw2-auth-token delete-comment-id '((:deleted . t) (:deleted-public . t)
1146                                                                          (:deleted-reason . "Comment deleted by its author.")))
1147                  nil))))
1148          (ignore-errors
1149            (get-post-comments post-id :force-revalidate t)
1150            (when question
1151              (get-post-answers post-id :force-revalidate t)))
1152          (when text
1153            (cache-put "comment-markdown-source" new-comment-id text)
1154            (redirect (generate-post-link (match-lw2-link (hunchentoot:request-uri*)) new-comment-id))))))))
1155
1156 (defparameter *edit-post-template* (compile-template* "edit-post.html"))
1157
1158 (define-page view-edit-post "/edit-post" (title url section post-id link-post)
1159   (request-method
1160     (:get ()
1161      (let* ((csrf-token (make-csrf-token))
1162             (post-body (if post-id (get-post-body post-id :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1163             (section (or section (loop for (sym . sec) in '((:draft . "drafts") (:meta . "meta") (:frontpage-date . "frontpage"))
1164                                        if (cdr (assoc sym post-body)) return sec
1165                                        finally (return "all")))))
1166        (emit-page (out-stream :title (if post-id "Edit Post" "New Post") :content-class "edit-post-page")
1167                   (render-template* *edit-post-template* out-stream
1168                                     :csrf-token csrf-token
1169                                     :title (cdr (assoc :title post-body))
1170                                     :url (cdr (assoc :url post-body))
1171                                     :question (cdr (assoc :question post-body))
1172                                     :post-id post-id
1173                                     :section-list (loop for (name desc) in '(("all" "All") ("meta" "Meta") ("drafts" "Drafts"))
1174                                                         collect (alist :name name :desc desc :selected (string= name section)))
1175                                     :markdown-source (or (and post-id (cache-get "post-markdown-source" post-id)) (cdr (assoc :html-body post-body)) "")))))
1176     (:post (text question)
1177      (let ((lw2-auth-token *current-auth-token*)
1178            (url (if (string= url "") nil url)))
1179        (assert lw2-auth-token)
1180        (let* ((post-data
1181                (list-cond
1182                 (t :body (postprocess-markdown text))
1183                 (t :title title)
1184                 (t :last-edited-as "markdown")
1185                 (t :url (if link-post url))
1186                 (t :meta (string= section "meta"))
1187                 (t :draft (string= section "drafts"))
1188                 ((not post-id) :question (and question t))))
1189               (post-set (loop for item in post-data when (cdr item) collect item))
1190               (post-unset (loop for item in post-data when (not (cdr item)) collect (cons (car item) t))))
1191          (let* ((new-post-data
1192                   (if post-id
1193                       (do-lw2-post-edit lw2-auth-token post-id post-set post-unset)
1194                       (do-lw2-post lw2-auth-token post-set)))
1195                 (new-post-id (cdr (assoc :--id new-post-data))))
1196            (assert new-post-id)
1197            (cache-put "post-markdown-source" new-post-id text)
1198            (ignore-errors (get-post-body post-id :force-revalidate t))
1199            (redirect (if (cdr (assoc "draft" post-data :test #'equal))
1200                          (concatenate 'string (generate-post-link new-post-data) "?need-auth=y")
1201                          (generate-post-link new-post-data)))))))))
1202
1203 (hunchentoot:define-easy-handler (view-karma-vote :uri "/karma-vote") ((csrf-token :request-type :post) (target :request-type :post) (target-type :request-type :post) (vote-type :request-type :post))
1204   (with-error-page
1205     (check-csrf-token csrf-token)
1206     (let ((lw2-auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1207       (multiple-value-bind (points vote-type) (do-lw2-vote lw2-auth-token target target-type vote-type)
1208         (json:encode-json-to-string (list (pretty-number points "point") vote-type))))))
1209
1210 (hunchentoot:define-easy-handler (view-check-notifications :uri "/check-notifications") ()
1211                                  (with-error-page
1212                                    (if *current-auth-token*
1213                                        (let ((notifications-status (check-notifications (logged-in-userid) *current-auth-token*)))
1214                                          (json:encode-json-to-string notifications-status)))))
1215
1216 (define-page view-recent-comments "/recentcomments" ((offset :type fixnum)
1217                                                      (limit :type fixnum))
1218   (let ((want-total (not (typep *current-backend* 'backend-lw2)))) ; jumping to last page causes LW2 to explode
1219     (multiple-value-bind (recent-comments total)
1220       (if (or offset limit (/= (user-pref :items-per-page) 20))
1221           (lw2-graphql-query (lw2-query-string :comment :list
1222                                                (remove nil (alist :view "postCommentsNew" :limit (or limit (user-pref :items-per-page)) :offset offset)
1223                                                        :key #'cdr)
1224                                                (comments-index-fields)
1225                                                :with-total want-total))
1226           (get-recent-comments :with-total want-total))
1227       (view-items-index recent-comments :title "Recent comments" :pagination (pagination-nav-bars :offset (or offset 0) :with-next (not want-total) :total (if want-total total))))))
1228
1229 (define-page view-user (:regex "^/users/(.*?)(?:$|\\?)|^/user" user-slug) (id
1230                                                                              (offset :type fixnum :default 0)
1231                                                                              (show :member '(:all :posts :comments :drafts :conversations :inbox) :default :all)
1232                                                                              (sort :member '(:top :new) :default :new))
1233              (let* ((auth-token (if (eq show :inbox) *current-auth-token*))
1234                     (user-query-terms (cond
1235                                         (user-slug (alist :slug user-slug))
1236                                         (id (alist :document-id id))))
1237                     (user-info
1238                       (let ((ui (lw2-graphql-query (lw2-query-string :user :single user-query-terms `(:--id :slug :display-name :karma ,@(if (eq show :inbox) '(:last-notifications-check))))
1239                                                    :auth-token auth-token)))
1240                         (if (cdr (assoc :--id ui))
1241                             ui
1242                             (error (make-condition 'lw2-user-not-found-error)))))
1243                     (user-id (cdr (assoc :--id user-info)))
1244                     (own-user-page (logged-in-userid user-id))
1245                     (comments-index-fields (remove :page-url (comments-index-fields))) ; page-url sometimes causes "Cannot read property '_id' of undefined" error
1246                     (display-name (if user-slug (cdr (assoc :display-name user-info)) user-id))
1247                     (show-text (if (not (eq show :all)) (string-capitalize show)))
1248                     (title (format nil "~A~@['s ~A~]" display-name show-text))
1249                     (sort-type (case sort (:top :score) (:new :date)))
1250                     (comments-base-terms (ecase sort-type (:score (load-time-value (alist :view "postCommentsTop"))) (:date (load-time-value (alist :view "allRecentComments"))))))
1251                (multiple-value-bind (items total)
1252                  (case show
1253                    (:posts
1254                      (get-user-posts user-id :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type))
1255                    (:comments
1256                      (lw2-graphql-query (lw2-query-string :comment :list
1257                                                           (nconc (alist :offset offset :limit (+ 1 (user-pref :items-per-page)) :user-id user-id)
1258                                                                  comments-base-terms)
1259                                                           comments-index-fields)))
1260                    (:drafts
1261                      (get-user-posts user-id :drafts t :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1262                    (:conversations
1263                      (let ((conversations
1264                              (lw2-graphql-query (lw2-query-string :conversation :list
1265                                                                   (alist :view "userConversations" :limit (+ 1 (user-pref :items-per-page)) :offset offset :user-id user-id)
1266                                                                   '(:--id :created-at :title (:participants :display-name :slug) :----typename))
1267                                                 :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1268                        (lw2-graphql-query-map
1269                          (lambda (c)
1270                            (lw2-query-string* :message :total (alist :view "messagesConversation" :conversation-id (cdr (assoc :--id c))) nil))
1271                          conversations
1272                          :postprocess (lambda (c result)
1273                                         (acons :messages-total result c))
1274                          :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1275                    (:inbox
1276                      (prog1
1277                        (let ((notifications (get-notifications :user-id user-id :offset offset :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1278                              (last-check (ignore-errors (local-time:parse-timestring (cdr (assoc :last-notifications-check user-info))))))
1279                          (labels ((check-new (key obj)
1280                                     (if (ignore-errors (local-time:timestamp< last-check (local-time:parse-timestring (cdr (assoc key obj)))))
1281                                         (acons :highlight-new t obj)
1282                                         obj)))
1283                            (lw2-graphql-query-map
1284                              (lambda (n)
1285                                (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1286                                                   ("comment"
1287                                                    (lw2-query-string* :comment :single
1288                                                                       (alist :document-id (cdr (assoc :document-id n)))
1289                                                                       (comments-index-fields)))
1290                                                   ("post"
1291                                                    (lw2-query-string* :post :single (alist :document-id (cdr (assoc :document-id n)))
1292                                                                       (posts-index-fields)))
1293                                                   ("message"
1294                                                    (lw2-query-string* :message :single (alist :document-id (cdr (assoc :document-id n)))
1295                                                                       *messages-index-fields*))
1296                                                   (t
1297                                                     (values n t))))
1298                              notifications
1299                              :postprocess (lambda (n result)
1300                                             (if result
1301                                                 (check-new
1302                                                   (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1303                                                                      ("comment" :posted-at)
1304                                                                      ("post" :posted-at)
1305                                                                      ("message" :created-at))
1306                                                   result)
1307                                                 n))
1308                              :auth-token auth-token)))
1309                        (do-user-edit
1310                          (hunchentoot:cookie-in "lw2-auth-token")
1311                          user-id
1312                          (alist :last-notifications-check
1313                                 (local-time:format-timestring nil (local-time:now)
1314                                                               :format lw2.graphql:+graphql-timestamp-format+
1315                                                               :timezone local-time:+utc-zone+)))))
1316                    (t
1317                      (let ((user-posts (get-user-posts user-id :limit (+ 1 (user-pref :items-per-page) offset)))
1318                            (user-comments (lw2-graphql-query (lw2-query-string :comment :list (nconc (alist :limit (+ 1 (user-pref :items-per-page) offset) :user-id user-id) comments-base-terms)
1319                                                                                comments-index-fields))))
1320                        (concatenate 'list user-posts user-comments))))
1321                  (let ((with-next (> (length items) (+ (if (eq show :all) offset 0) (user-pref :items-per-page))))
1322                        (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
1323                    (view-items-index interleave :title title
1324                                      :content-class (format nil "user-page~@[ ~A-user-page~]~:[~; own-user-page~]" show-text own-user-page)
1325                                      :current-uri (format nil "/users/~A" user-slug)
1326                                      :section :personal
1327                                      :pagination (pagination-nav-bars :offset offset :total total :with-next (if (not total) with-next))
1328                                      :need-auth (eq show :drafts) :section (if (eq show :drafts) "drafts" nil)
1329                                      :top-nav (lambda (out-stream)
1330                                                 (page-toolbar-to-html out-stream
1331                                                                       :title title
1332                                                                       :rss (not (member show '(:drafts :conversations :inbox)))
1333                                                                       :new-post (if (eq show :drafts) "drafts" t)
1334                                                                       :new-conversation (if own-user-page t user-slug)
1335                                                                       :logout own-user-page)
1336                                                 (format out-stream "<h1 class=\"page-main-heading\"~@[ ~A~]>~A</h1><div class=\"user-stats\">Karma: <span class=\"karma-total\">~A</span></div>"
1337                                                         (if (not own-user-page)
1338                                                             (if user-slug
1339                                                                 (format nil "data-anti-kibitzer-redirect=\"/user?id=~A\"" (cdr (assoc :--id user-info)))
1340                                                                 (format nil "data-kibitzer-redirect=\"/users/~A\"" (cdr (assoc :slug user-info)))))
1341                                                         (encode-entities display-name)
1342                                                         (if user-slug (pretty-number (or (cdr (assoc :karma user-info)) 0)) "##"))
1343                                                 (sublevel-nav-to-html out-stream
1344                                                                       `(:all :posts :comments
1345                                                                         ,@(if own-user-page
1346                                                                               '(:drafts :conversations :inbox)))
1347                                                                       show
1348                                                                       :default :all)
1349                                                 (when (member show '(:all :posts :comments))
1350                                                   (sublevel-nav-to-html out-stream
1351                                                                         '(:new :top)
1352                                                                         sort
1353                                                                         :default :new
1354                                                                         :param-name "sort"
1355                                                                         :extra-class "sort"))))))))
1356
1357 (defparameter *conversation-template* (compile-template* "conversation.html"))
1358
1359 (define-page view-conversation "/conversation" (id to subject)
1360   (request-method
1361    (:get ()
1362      (cond
1363        ((and id to) (error "This is an invalid URL."))
1364        (id
1365         (multiple-value-bind (conversation messages)
1366             (get-conversation-messages id (hunchentoot:cookie-in "lw2-auth-token"))
1367           (view-items-index (nreverse messages) :content-class "conversation-page" :need-auth t :title (encode-entities (postprocess-conversation-title (cdr (assoc :title conversation))))
1368                             :top-nav (lambda (out-stream) (render-template* *conversation-template* out-stream
1369                                                                             :conversation conversation :csrf-token (make-csrf-token))))))
1370        (t
1371         (emit-page (out-stream :title "New conversation" :content-class "conversation-page")
1372                    (render-template* *conversation-template* out-stream
1373                                      :to to
1374                                      :csrf-token (make-csrf-token))))))
1375    (:post ((text :required t))
1376      (let* ((id (or id
1377                     (let ((participant-ids (list (logged-in-userid) (cdar (lw2-graphql-query (lw2-query-string :user :single (alist :slug to) '(:--id)))))))
1378                       (do-create-conversation (hunchentoot:cookie-in "lw2-auth-token") (alist :participant-ids participant-ids :title subject))))))
1379        (do-create-message (hunchentoot:cookie-in "lw2-auth-token") id text)
1380        (redirect (format nil "/conversation?id=~A" id))))))
1381
1382 (defun search-result-markdown-to-html (item)
1383   (cons (cons :html-body
1384               (handler-case (markdown:parse (cdr (assoc :body item)))
1385                 (serious-condition () "[Error while processing search result]")))
1386         item))
1387
1388 (define-page view-search "/search" ((q :required t))
1389   (let ((*current-search-query* q)
1390         (link (convert-any-link* q)))
1391     (declare (special *current-search-query*))
1392     (if link
1393         (redirect link)
1394         (multiple-value-bind (posts comments) (lw2-search-query q)
1395           (view-items-index (nconc (map 'list (lambda (p) (if (cdr (assoc :comment-count p)) p (cons (cons :comment-count 0) p))) posts)
1396                                    (map 'list #'search-result-markdown-to-html comments))
1397                             :content-class "search-results-page" :current-uri "/search"
1398                             :title (format nil "~@[~A - ~]Search" q))))))
1399
1400 (define-page view-login "/login" (return cookie-check
1401                                          (csrf-token :request-type :post) (login-username :request-type :post) (login-password :request-type :post)
1402                                          (signup-username :request-type :post) (signup-email :request-type :post) (signup-password :request-type :post) (signup-password2 :request-type :post))
1403   (labels
1404     ((emit-login-page (&key error-message)
1405        (let ((csrf-token (make-csrf-token)))
1406          (emit-page (out-stream :title "Log in" :current-uri "/login" :content-class "login-page" :robots "noindex, nofollow")
1407                     (when error-message
1408                       (format out-stream "<div class=\"error-box\">~A</div>" error-message))
1409                     (with-outputs (out-stream) "<div class=\"login-container\">")
1410                     (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "login-form" "Log in" csrf-token
1411                                  '(("login-username" "Username" "text" "username")
1412                                    ("login-password" "Password" "password" "current-password"))
1413                                  "Log in"
1414                                  :end-html "<a href=\"/reset-password\">Forgot password</a>")
1415                     (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "signup-form" "Create account" csrf-token
1416                                  '(("signup-username" "Username" "text" "username")
1417                                    ("signup-email" "Email" "text" "email")
1418                                    ("signup-password" "Password" "password" "new-password")
1419                                    ("signup-password2" "Confirm password" "password" "new-password"))
1420                                  "Create account")
1421                     (alexandria:if-let (main-site-title (main-site-title *current-site*))
1422                       (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>"
1423                               main-site-title))
1424                     (format out-stream "</div>"))))
1425      (finish-login (username user-id auth-token error-message &optional expires)
1426        (cond
1427          (auth-token
1428            (set-cookie "lw2-auth-token" auth-token :max-age (and expires (+ (- expires (get-unix-time)) (* 24 60 60))))
1429            (if expires (set-cookie "lw2-status" (json:encode-json-to-string (alist :expires expires))))
1430            (cache-put "auth-token-to-userid" auth-token user-id)
1431            (cache-put "auth-token-to-username" auth-token username)
1432            (redirect (if (and return (ppcre:scan "^/[^/]" return)) return "/")))
1433          (t
1434           (emit-login-page :error-message error-message)))))
1435     (cond
1436       ((not (or cookie-check (hunchentoot:cookie-in "session-token")))
1437         (set-cookie "session-token" (base64:usb8-array-to-base64-string (ironclad:make-random-salt)))
1438         (redirect (format nil "/login?~@[return=~A&~]cookie-check=y" (if return (url-rewrite:url-encode return)))))
1439       (cookie-check
1440         (if (hunchentoot:cookie-in "session-token")
1441             (redirect (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))))
1442             (emit-page (out-stream :title "Log in" :current-uri "/login")
1443                        (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))))))
1444       (login-username
1445         (check-csrf-token csrf-token)
1446         (cond
1447           ((or (string= login-username "") (string= login-password "")) (emit-login-page :error-message "Please enter a username and password"))
1448           (t (multiple-value-call #'finish-login login-username (do-login "username" login-username login-password)))))
1449       (signup-username
1450         (check-csrf-token csrf-token)
1451         (cond
1452           ((not (every (lambda (x) (not (string= x ""))) (list signup-username signup-email signup-password signup-password2)))
1453            (emit-login-page :error-message "Please fill in all fields"))
1454           ((not (string= signup-password signup-password2))
1455            (emit-login-page :error-message "Passwords do not match"))
1456           (t (multiple-value-call #'finish-login signup-username (do-lw2-create-user signup-username signup-email signup-password)))))
1457       (t
1458        (emit-login-page)))))
1459
1460 (define-page view-logout "/logout" ((logout :request-type :post))
1461   (check-csrf-token logout)
1462   (set-cookie "lw2-auth-token" "" :max-age 0)
1463   (redirect "/"))
1464
1465 (defparameter *reset-password-template* (compile-template* "reset-password.html"))
1466
1467 (define-page view-reset-password "/reset-password" ((csrf-token :request-type :post) (email :request-type :post) (reset-link :request-type :post) (password :request-type :post) (password2 :request-type :post))
1468   (labels ((emit-rpw-page (&key message message-type step)
1469              (let ((csrf-token (make-csrf-token)))
1470                (emit-page (out-stream :title "Reset password" :content-class "reset-password" :robots "noindex, nofollow")
1471                           (render-template* *reset-password-template* out-stream
1472                                             :csrf-token csrf-token
1473                                             :reset-link reset-link
1474                                             :message message
1475                                             :message-type message-type
1476                                             :step step)))))
1477     (cond
1478       (email
1479         (check-csrf-token csrf-token)
1480         (multiple-value-bind (ret error)
1481           (do-lw2-forgot-password email)
1482           (declare (ignore ret))
1483           (if error
1484               (emit-rpw-page :step 1 :message error :message-type "error")
1485               (emit-rpw-page :step 1 :message "Password reset email sent." :message-type "success"))))
1486       (reset-link
1487         (ppcre:register-groups-bind (reset-token) ("(?:reset-password/|^)([^/#]+)$" reset-link)
1488                                     (cond
1489                                       ((not reset-token)
1490                                        (emit-rpw-page :step 2 :message "Invalid password reset link." :message-type "error"))
1491                                       ((not (string= password password2))
1492                                        (emit-rpw-page :step 2 :message "Passwords do not match." :message-type "error"))
1493                                       (t
1494                                        (check-csrf-token csrf-token)
1495                                        (multiple-value-bind (user-id auth-token error-message) (do-lw2-reset-password reset-token password)
1496                                          (declare (ignore user-id auth-token))
1497                                          (cond
1498                                            (error-message (emit-rpw-page :step 2 :message error-message :message-type "error"))
1499                                            (t
1500                                             (with-error-page (emit-page (out-stream :title "Reset password" :content-class "reset-password")
1501                                                                         (format out-stream "<h1>Password reset complete</h1><p>You can now <a href=\"/login\">log in</a> with your new password.</p>"))))))))))
1502       (t
1503        (emit-rpw-page)))))
1504
1505 (defun firstn (list n)
1506   (loop for x in list
1507         for i from 1 to n
1508         collect x))
1509
1510 (defparameter *earliest-post* (local-time:parse-timestring "2005-01-01"))
1511
1512 (define-page view-archive (:regex "^/archive(?:/(\\d{4})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))"
1513                            (year :type (mod 10000))
1514                            (month :type (integer 1 12))
1515                            (day :type (integer 1 31)))
1516              ((offset :type fixnum :default 0))
1517   (local-time:with-decoded-timestamp (:day current-day :month current-month :year current-year) (local-time:now)
1518     (local-time:with-decoded-timestamp (:day earliest-day :month earliest-month :year earliest-year) *earliest-post*
1519       (labels ((url-elements (&rest url-elements)
1520                  (declare (dynamic-extent url-elements))
1521                  (format nil "/~{~A~^/~}" url-elements))
1522                (archive-nav (out-stream)
1523                  (with-outputs (out-stream) "<div class=\"archive-nav\"><div class=\"archive-nav-years\">")
1524                  (link-if-not out-stream (not (or year month day)) (url-elements "archive") "archive-nav-item-year" "All")
1525                  (loop for y from earliest-year to current-year
1526                        do (link-if-not out-stream (eq y year) (url-elements "archive" y) "archive-nav-item-year" y))
1527                  (format out-stream "</div>")
1528                  (when year
1529                    (format out-stream "<div class=\"archive-nav-months\">")
1530                    (link-if-not out-stream (not month) (url-elements "archive" year) "archive-nav-item-month" "All")
1531                    (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)
1532                          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)))
1533                    (format out-stream "</div>"))
1534                  (when month
1535                    (format out-stream "<div class=\"archive-nav-days\">")
1536                    (link-if-not out-stream (not day) (url-elements "archive" year month) "archive-nav-item-day" "All")
1537                    (loop for d from (if (and (= (or year current-year) earliest-year) (= (or month current-month) earliest-month)) earliest-day 1)
1538                          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)))
1539                          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))
1540                    (format out-stream "</div>"))
1541                  (format out-stream "</div>")))
1542         (multiple-value-bind (posts total)
1543           (lw2-graphql-query (lw2-query-string :post :list
1544                                                (alist :view (if day "new" "top") :limit 51 :offset offset
1545                                                       :after (if (and year (not day)) (format nil "~A-~A-~A" (or year earliest-year) (or month 1) (or day 1)))
1546                                                       :before (if year (format nil "~A-~A-~A" (or year current-year) (or month 12)
1547                                                                                (or day (local-time:days-in-month (or month 12) (or year current-year))))))
1548                                                (posts-index-fields)))
1549           (emit-page (out-stream :title "Archive" :current-uri "/archive" :content-class "archive-page"
1550                                  :top-nav #'archive-nav
1551                                  :pagination (pagination-nav-bars :items-per-page 50 :offset offset :total total :with-next (if total nil (> (length posts) 50))))
1552                      (write-index-items-to-html out-stream (firstn posts 50) :empty-message "No posts for the selected period.")))))))
1553
1554 (define-page view-about "/about" ()
1555   (emit-page (out-stream :title "About" :current-uri "/about" :content-class "about-page")
1556              (alexandria:with-input-from-file (in-stream "www/about.html" :element-type '(unsigned-byte 8))
1557                                               (alexandria:copy-stream in-stream out-stream))))
1558
1559 (hunchentoot:define-easy-handler (view-versioned-resource :uri (lambda (r)
1560                                                                  (multiple-value-bind (file content-type)
1561                                                                    #.(labels ((defres (uri content-type)
1562                                                                                 `(,uri (values (concatenate 'string "www" ,uri) ,content-type))))
1563                                                                        (concatenate 'list
1564                                                                                     '(alexandria:switch ((hunchentoot:script-name r) :test #'string=))
1565                                                                                     (loop for system in '("mac" "windows" "linux") nconc
1566                                                                                       (loop for theme in '(nil "dark" "grey" "ultramodern" "zero" "brutalist" "rts")
1567                                                                                             collect (defres (format nil "/css/style~@[-~A~].~A.css" theme system) "text/css")))
1568                                                                                     (loop for (uri content-type) in
1569                                                                                       '(("/script.js" "text/javascript")
1570                                                                                         ("/assets/favicon.ico" "image/x-icon"))
1571                                                                                       collect (defres uri content-type))))
1572                                                                    (when file
1573                                                                      (when (assoc "v" (hunchentoot:get-parameters r) :test #'string=)
1574                                                                        (setf (hunchentoot:header-out "Cache-Control") (format nil "public, max-age=~A, immutable" (- (expt 2 31) 1))))
1575                                                                      (hunchentoot:handle-static-file file content-type)
1576                                                                      t))))
1577                                  nil)