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   (:unintern
   5     #:define-regex-handler #:*fonts-stylesheet-uri* #:generate-fonts-link
   6     #:user-nav-bar #:*primary-nav* #:*secondary-nav* #:*nav-bars*
   7     #:begin-html #:end-html))
   8
   9 (in-package #:lw2-viewer)
  10
  11 (named-readtables:in-readtable html-reader)
  12
  13 (add-template-directory (asdf:system-relative-pathname "lw2-viewer" "templates/"))
  14
  15 (define-cache-database "auth-token-to-userid" "auth-token-to-username" "comment-markdown-source" "post-markdown-source")
  16
  17 (defvar *current-auth-token*)
  18 (defvar *current-userid*)
  19 (defvar *current-username*)
  20 (defvar *current-user-slug*)
  21
  22 (defvar *read-only-mode* nil)
  23 (defvar *read-only-default-message* "Due to a system outage, you cannot log in or post at this time.")
  24
  25 (defparameter *default-prefs* (alist :items-per-page 20 :default-sort "new"))
  26 (defvar *current-prefs* nil)
  27
  28 (defun logged-in-userid (&optional is-userid)
  29   (let ((current-userid *current-userid*))
  30     (if is-userid
  31         (string= current-userid is-userid)
  32         current-userid)))
  33
  34 (defun logged-in-username ()
  35   *current-username*)
  36
  37 (defun logged-in-user-slug ()
  38   *current-user-slug*)
  39
  40 (defun pretty-time (timestring &key format)
  41   (let ((time (local-time:parse-timestring timestring)))
  42   (values (local-time:format-timestring nil time :timezone local-time:+utc-zone+ :format (or format '(:day #\  :short-month #\  :year #\  :hour #\: (:min 2) #\  :timezone)))
  43           (* (local-time:timestamp-to-unix time) 1000))))
  44
  45 (defun pretty-number (number &optional object)
  46   (let ((str (coerce (format nil "~:D~@[<span> ~A~P</span>~]" number object number) '(vector character))))
  47     (if (eq (aref str 0) #\-)
  48       (setf (aref str 0) #\MINUS_SIGN))
  49     str))
  50
  51 (defun generate-post-auth-link (post &optional comment-id absolute need-auth)
  52   (if need-auth
  53       (concatenate 'string (generate-post-link post comment-id absolute) "?need-auth=y")
  54       (generate-post-link post comment-id absolute)))
  55
  56 (defun clean-lw-link (url)
  57   (when url
  58     (ppcre:regex-replace "([^/]*//[^/]*)lesserwrong\.com" url "\\1lesswrong.com")))
  59
  60 (defun votes-to-tooltip (votes)
  61   (if votes
  62       (format nil "~A vote~:*~P"
  63               (typecase votes (integer votes) (list (length votes))))
  64       ""))
  65
  66 (defun post-section-to-html (post &key skip-section)
  67   (alist-bind ((user-id string)
  68                (frontpage-date (or null string))
  69                (curated-date (or null string))
  70                (meta boolean)
  71                (af boolean)
  72                (draft boolean))
  73               post
  74               (multiple-value-bind (class title href)
  75                   (cond (af (if (eq skip-section :alignment-forum) nil (values "alignment-forum" "View Alignment Forum posts" "/index?view=alignment-forum")))
  76                                         ; show alignment forum even if skip-section is t
  77                         ((eq skip-section t) nil)
  78                         (draft nil)
  79                         (curated-date (if (eq skip-section :featured) nil (values "featured" "View Featured posts" "/index?view=featured")))
  80                         (frontpage-date (if (eq skip-section :frontpage) nil (values "frontpage" "View Frontpage posts" "/")))
  81                         (meta (if (eq skip-section :meta) nil (values "meta" "View Meta posts" "/index?view=meta")))
  82                         (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))))))
  83                 <a class=("post-section ~A" class) title=title href=href></a>)))
  84
  85 (defun post-headline-to-html (post &key skip-section need-auth)
  86   (alist-bind ((post-id string :--id)
  87                (title string)
  88                (user-id string)
  89                (url (or null string))
  90                (posted-at string)
  91                (base-score fixnum)
  92                (comment-count (or null fixnum))
  93                (page-url (or null string))
  94                (word-count (or null fixnum))
  95                (frontpage-date (or null string))
  96                (curated-date (or null string))
  97                (meta boolean)
  98                (af boolean)
  99                (question boolean)
 100                (vote-count (or null fixnum))
 101                (draft boolean))
 102     post
 103     (multiple-value-bind (pretty-time js-time) (pretty-time posted-at)
 104       <h1 class=("listing~{ ~A~}" (list-cond
 105                                    (url "link-post-listing")
 106                                    (question "question-post-listing")
 107                                    ((logged-in-userid user-id) "own-post-listing")))>
 108         (if url <a href=(convert-any-link (string-trim " " url))>&#xf0c1;</a>)
 109         <a href=(generate-post-auth-link post nil nil need-auth)>
 110           (if question <span class="post-type-prefix">[Question] </span>)
 111           (safe (clean-text-to-html title))
 112         </a>
 113         (if (logged-in-userid user-id) <a class="edit-post-link button" href=("/edit-post?post-id=~A" post-id)</a>)
 114       </h1>
 115       <div class="post-meta">
 116         <a class=("author~{ ~A~}" (list-cond ((logged-in-userid user-id) "own-user-author")))
 117            href=("/users/~A" (get-user-slug user-id))
 118            data-userid=user-id>
 119           (get-username user-id)
 120         </a>
 121         <div class="date" data-js-date=js-time>(progn pretty-time)</div>
 122         <div class="karma">
 123           <span class="karma-value" title=(votes-to-tooltip vote-count)>(safe (pretty-number base-score "point"))</span>
 124         </div>
 125         <a class="comment-count" href=("~A#comments" (generate-post-link post))>(safe (pretty-number (or comment-count 0) "comment"))</a>
 126         (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>)
 127         (if page-url <a class="lw2-link" href=(clean-lw-link page-url)>(main-site-abbreviation *current-site*)<span> link</span></a>)
 128         (with-html-stream-output (post-section-to-html post :skip-section skip-section))
 129         (if url <div class="link-post-domain">("(~A)" (puri:uri-host (puri:parse-uri (string-trim " " url))))</div>)
 130       </div>)))
 131
 132 (defun post-body-to-html (post)
 133   (alist-bind ((post-id string :--id)
 134                (title string)
 135                (user-id string)
 136                (url (or null string))
 137                (posted-at string)
 138                (base-score fixnum)
 139                (tags (or null list))
 140                (comment-count (or null fixnum))
 141                (page-url (or null string))
 142                (frontpage-date (or null string))
 143                (curated-date (or null string))
 144                (meta boolean)
 145                (draft boolean)
 146                (af boolean)
 147                (question boolean)
 148                (vote-count (or null fixnum))
 149                (html-body (or null string)))
 150     post
 151     (multiple-value-bind (pretty-time js-time) (pretty-time posted-at)
 152       <div class=("post~{ ~A~}" (list-cond
 153                                  (url "link-post")
 154                                  (question "question-post")))>
 155         <h1 class="post-title">
 156           (if question <span class="post-type-prefix">[Question] </span>)
 157           (safe (clean-text-to-html title :hyphenation nil))
 158         </h1>
 159         <div class="post-meta">
 160           <a class=("author~{ ~A~}" (list-cond
 161                                      ((logged-in-userid user-id) "own-user-author")))
 162              href=("/users/~A" (get-user-slug user-id))
 163              data-userid=user-id>
 164             (get-username user-id)
 165           </a>
 166           <div class="date" data-js-date=js-time>(progn pretty-time)</div>
 167           <div class="karma" data-post-id=post-id>
 168             <span class="karma-value" title=(votes-to-tooltip vote-count)>(safe (pretty-number base-score "point"))</span>
 169           </div>
 170           <a class="comment-count" href="#comments">(safe (pretty-number (or comment-count 0) "comment"))</a>
 171           (if page-url <a class="lw2-link" href=(clean-lw-link page-url)>(main-site-abbreviation *current-site*)<span> link</span></a>)
 172           (with-html-stream-output (post-section-to-html post))
 173           (when tags
 174             <div id="tags">
 175               (dolist (tag tags) (alist-bind ((text string)) tag <a href=("/tags/~A" text)>(progn text)</a>))
 176             </div>)
 177         </div>
 178         <div class="post-body">
 179           (if url <p><a class="link-post-link" href=(convert-any-link (string-trim " " url))>Link post</a></p>)
 180           (with-html-stream-output
 181               (write-sequence (clean-html* (or html-body "") :with-toc t :post-id post-id) *html-output*))
 182         </div>
 183       </div>)))
 184
 185 (defparameter *comment-individual-link* nil)
 186
 187 (defun comment-to-html (out-stream comment &key with-post-title)
 188   (if (or (cdr (assoc :deleted comment)) (cdr (assoc :deleted-public comment)))
 189       (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>")
 190       (alist-bind ((comment-id string :--id)
 191                    (user-id string)
 192                    (posted-at string)
 193                    (highlight-new boolean)
 194                    (post-id string)
 195                    (base-score fixnum)
 196                    (page-url (or null string))
 197                    (parent-comment list)
 198                    (parent-comment-id (or null string))
 199                    (child-count (or null fixnum))
 200                    (children list)
 201                    (vote-count (or null fixnum))
 202                    (retracted boolean)
 203                    (answer boolean)
 204                    (parent-answer-id (or null string))
 205                    (html-body string))
 206                   comment
 207                   (multiple-value-bind (pretty-time js-time) (pretty-time posted-at)
 208                     <div class=("comment~{ ~A~}"
 209                                 (list-cond
 210                                  ((and (logged-in-userid user-id)
 211                                        (< (* 1000 (local-time:timestamp-to-unix (local-time:now))) (+ js-time 15000)))
 212                                   "just-posted-comment")
 213                                  (highlight-new "comment-item-highlight")
 214                                  (retracted "retracted")))>
 215                       <div class="comment-meta">
 216                         <a class=("author~:[~; own-user-author~]" (logged-in-userid user-id))
 217                            href=("/users/~A" (encode-entities (get-user-slug user-id)))
 218                            data-userid=user-id>
 219                           (get-username user-id)
 220                         </a>
 221                         <a class="date" href=(generate-post-link post-id comment-id) data-js-date=js-time> (safe pretty-time) </a>
 222                         <div class="karma">
 223                           <span class="karma-value" title=(votes-to-tooltip vote-count)> (safe (pretty-number base-score "point")) </span>
 224                         </div>
 225                         <a class="permalink" href=("~A/~A/~A"
 226                                                    (generate-post-link post-id)
 227                                                    (cond ((or answer parent-answer-id) "answer") (t "comment"))
 228                                                    comment-id)
 229                            title="Permalink"></a>
 230                         (with-html-stream-output
 231                           (when page-url
 232                             <a class="lw2-link" href=(clean-lw-link page-url) title=(main-site-abbreviation *current-site*)></a>)
 233                           (if with-post-title
 234                               <div class="comment-post-title">
 235                                 (with-html-stream-output
 236                                     (when parent-comment
 237                                       (alist-bind ((user-id string)
 238                                                    (post-id string)
 239                                                    (parent-id string :--id))
 240                                                   parent-comment
 241                                         <span class="comment-in-reply-to">in reply to:
 242                                           <a href=("/users/~A" (get-user-slug user-id))
 243                                              class=("inline-author~:[~; own-user-author~]" (logged-in-userid user-id))
 244                                              data-userid=(progn user-id)>
 245                                              (get-username user-id)</a>'s
 246                                           <a href=(generate-post-link post-id parent-id)>comment</a>
 247                                           (progn " ")
 248                                         </span>)))
 249                                   <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>
 250                                 </div>
 251                             (when parent-comment-id
 252                               (if *comment-individual-link*
 253                                   <a class="comment-parent-link" href=(progn parent-comment-id) title="Parent"></a>
 254                                   <a class="comment-parent-link" href=("#comment-~A" parent-comment-id)>Parent</a>)))
 255                           (when children
 256                             <div class="comment-child-links">
 257                               Replies:
 258                               (with-html-stream-output
 259                                 (dolist (child children)
 260                                   (alist-bind ((comment-id string)
 261                                                (user-id string))
 262                                               child
 263                                     <a href=("#comment-~A" comment-id)>(">~A" (get-username user-id))</a>)))
 264                             </div>)
 265                           <div class="comment-minimize-button"
 266                                data-child-count=(progn child-count)>
 267                           </div>)
 268                         </div>
 269                         <div class="comment-body" (safe ("~@[ data-markdown-source=\"~A\"~]"
 270                                                          (if (logged-in-userid user-id)
 271                                                              (encode-entities
 272                                                               (or (cache-get "comment-markdown-source" comment-id)
 273                                                                   html-body)))))>
 274                           (with-html-stream-output (write-sequence (clean-html* html-body) out-stream))
 275                         </div>
 276                       </div>))))
 277
 278 (defun postprocess-conversation-title (title)
 279   (if (or (null title) (string= title ""))
 280       "[Untitled conversation]"
 281       title))
 282
 283 (defun conversation-message-to-html (out-stream message)
 284   (alist-bind ((user-id string)
 285                (created-at string)
 286                (highlight-new boolean)
 287                (conversation list)
 288                (content list)
 289                (html-body (or string null)))
 290     message
 291     (multiple-value-bind (pretty-time js-time) (pretty-time created-at)
 292       (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\">"
 293               (if highlight-new " comment-item-highlight" "")
 294               (encode-entities (get-user-slug user-id))
 295               (encode-entities (get-username user-id))
 296               js-time
 297               pretty-time
 298               (encode-entities (cdr (assoc :--id conversation)))
 299               (encode-entities (postprocess-conversation-title (cdr (assoc :title conversation))))))
 300     (if html-body
 301         (write-sequence (clean-html* html-body) out-stream)
 302         (format out-stream "~{<p>~A</p>~}" (loop for block in (cdr (assoc :blocks content)) collect (encode-entities (cdr (assoc :text block))))))
 303     (format out-stream "</div></div>")))
 304
 305 (defun conversation-index-to-html (out-stream conversation)
 306   (alist-bind ((conversation-id string :--id)
 307                (title (or null string))
 308                (created-at (or null string))
 309                (participants list)
 310                (messages-total fixnum))
 311     conversation
 312     (multiple-value-bind (pretty-time js-time) (if created-at (pretty-time created-at) (values "[Error]" 0))
 313       (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>"
 314               (encode-entities conversation-id)
 315               (encode-entities (postprocess-conversation-title title))
 316               (loop for p in participants
 317                     collect (list (encode-entities (cdr (assoc :slug p))) (encode-entities (cdr (assoc :display-name p)))))
 318               (pretty-number messages-total "message")
 319               js-time
 320               pretty-time))))
 321
 322 (defun error-to-html (out-stream condition)
 323   (format out-stream "<div class=\"gw-error\"><h1>Error</h1><p>~A</p></div>"
 324           (encode-entities (princ-to-string condition))))
 325
 326 (defmacro with-error-html-block ((out-stream) &body body)
 327   "If an error occurs within BODY, write an HTML representation of the
 328 signaled condition to OUT-STREAM."
 329   `(handler-case
 330      (progn ,@body)
 331      (serious-condition (c) (error-to-html ,out-stream c))))
 332
 333 (defun make-comment-parent-hash (comments)
 334   (let ((existing-comment-hash (make-hash-table :test 'equal))
 335         (hash (make-hash-table :test 'equal)))
 336     (dolist (c comments)
 337       (alexandria:if-let (id (cdr (assoc :--id c)))
 338                          (setf (gethash id existing-comment-hash) t)))
 339     (dolist (c comments)
 340       (let* ((parent-id (cdr (assoc :parent-comment-id c)))
 341              (old (gethash parent-id hash)))
 342         (setf (gethash parent-id hash) (cons c old))
 343         (when (and parent-id (not (gethash parent-id existing-comment-hash)))
 344           (let ((placeholder (alist :--id parent-id :parent-comment-id nil :deleted t)))
 345             (setf (gethash parent-id existing-comment-hash) t
 346                   (gethash nil hash) (cons placeholder (gethash nil hash)))))))
 347     (maphash (lambda (k old)
 348                (setf (gethash k hash) (nreverse old)))
 349              hash)
 350     (labels
 351       ((count-children (parent)
 352         (let ((children (gethash (cdr (assoc :--id parent)) hash)))
 353           (+ (length children) (apply #'+ (map 'list #'count-children children)))))
 354        (add-child-counts (comment-list)
 355         (loop for c in comment-list
 356               as id = (cdr (assoc :--id c))
 357               do (setf (gethash id hash) (add-child-counts (gethash id hash)))
 358               collecting (cons (cons :child-count (count-children c)) c))))
 359       (setf (gethash nil hash) (add-child-counts (gethash nil hash))))
 360     hash))
 361
 362 (defun comment-thread-to-html (out-stream emit-comment-item-fn)
 363   (format out-stream "<ul class=\"comment-thread\">")
 364   (funcall emit-comment-item-fn)
 365   (format out-stream "</ul>"))
 366
 367 (defun comment-item-to-html (out-stream comment &key extra-html-fn)
 368   (with-error-html-block (out-stream)
 369     (let ((c-id (cdr (assoc :--id comment))))
 370       (format out-stream "<li id=\"comment-~A\" class=\"comment-item\">" c-id)
 371       (unwind-protect
 372         (comment-to-html out-stream comment)
 373         (if extra-html-fn (funcall extra-html-fn c-id))
 374         (format out-stream "</li>")))))
 375
 376 (defun comment-tree-to-html (out-stream comment-hash &optional (target nil) (level 0))
 377   (let ((comments (gethash target comment-hash)))
 378     (when comments
 379       (comment-thread-to-html out-stream
 380         (lambda ()
 381           (loop for c in comments do
 382                 (comment-item-to-html out-stream c
 383                   :extra-html-fn (lambda (c-id)
 384                                    (if (and (= level 10) (gethash c-id comment-hash))
 385                                        (format out-stream "<input type=\"checkbox\" id=\"expand-~A\"><label for=\"expand-~:*~A\" data-child-count=\"~A comment~:P\">Expand this thread</label>"
 386                                                c-id
 387                                                (cdr (assoc :child-count c))))
 388                                    (comment-tree-to-html out-stream comment-hash c-id (1+ level))))))))))
 389
 390 (defun comment-chrono-to-html (out-stream comments)
 391   (let ((comment-hash (make-comment-parent-hash comments))
 392         (comments-sorted (sort comments #'local-time:timestamp< :key (lambda (c) (local-time:parse-timestring (cdr (assoc :posted-at c)))))))
 393     (comment-thread-to-html out-stream
 394       (lambda ()
 395         (loop for c in comments-sorted do
 396               (let* ((c-id (cdr (assoc :--id c)))
 397                      (new-c (acons :children (gethash c-id comment-hash) c)))
 398                 (comment-item-to-html out-stream new-c)))))))
 399
 400 (defun comment-post-interleave (list &key limit offset (sort-by :date))
 401   (multiple-value-bind (sort-fn sort-key)
 402     (ecase sort-by
 403       (:date (values #'local-time:timestamp> (lambda (x) (local-time:parse-timestring (cdr (assoc :posted-at x))))))
 404       (:score (values #'> (lambda (x) (cdr (assoc :base-score x))))))
 405     (let ((sorted (sort list sort-fn :key sort-key)))
 406       (loop for end = (if (or limit offset) (+ (or limit 0) (or offset 0)))
 407             for x in sorted
 408             for count from 0
 409             until (and end (>= count end))
 410             when (or (not offset) (>= count offset))
 411             collect x))))
 412
 413 (defun write-index-items-to-html (out-stream items &key need-auth (empty-message "No entries.") skip-section)
 414   (if items
 415       (dolist (x items)
 416         (with-error-html-block (out-stream)
 417           (cond
 418             ((typep x 'condition)
 419              (error-to-html out-stream x))
 420             ((assoc :message x)
 421              (format out-stream "<p>~A</p>" (cdr (assoc :message x))))
 422             ((string= (cdr (assoc :----typename x)) "Message")
 423              (format out-stream "<ul class=\"comment-thread\"><li class=\"comment-item\">")
 424              (unwind-protect
 425                (conversation-message-to-html out-stream x)
 426                (format out-stream "</li></ul>")))
 427             ((string= (cdr (assoc :----typename x)) "Conversation")
 428              (conversation-index-to-html out-stream x))
 429             ((assoc :comment-count x)
 430              (post-headline-to-html x :need-auth need-auth :skip-section skip-section))
 431             (t
 432              (format out-stream "<ul class=\"comment-thread\"><li class=\"comment-item\" id=\"comment-~A\">" (cdr (assoc :--id x)))
 433              (unwind-protect
 434                (comment-to-html out-stream x :with-post-title t)
 435                (format out-stream "</li></ul>"))))))
 436       (format out-stream "<div class=\"listing-message\">~A</div>" empty-message)))
 437
 438 (defun write-index-items-to-rss (out-stream items &key title need-auth)
 439   (let ((full-title (format nil "~@[~A - ~]~A" title (site-title *current-site*))))
 440     (xml-emitter:with-rss2 (out-stream :encoding "UTF-8")
 441       (xml-emitter:rss-channel-header full-title (site-uri *current-site*) :description full-title)
 442       (labels ((emit-item (item &key title link (guid (cdr (assoc :--id item))) (author (get-username (cdr (assoc :user-id item))))
 443                                 (date (pretty-time (cdr (assoc :posted-at item)) :format local-time:+rfc-1123-format+)) body)
 444                           (xml-emitter:rss-item
 445                             title
 446                             :link link
 447                             :author author
 448                             :pubDate date
 449                             :guid guid
 450                             :description body)))
 451         (dolist (item items)
 452           (if (assoc :comment-count item)
 453             (let ((author (get-username (cdr (assoc :user-id item)))))
 454               (emit-item item
 455                          :title (clean-text (format nil "~A by ~A" (cdr (assoc :title item)) author))
 456                          :author author
 457                          :link (generate-post-auth-link item nil t need-auth)
 458                          :body (clean-html (or (cdr (assoc :html-body (get-post-body (cdr (assoc :--id item)) :revalidate nil))) "") :post-id (cdr (assoc :--id item)))))
 459             (emit-item item
 460                        :title (format nil "Comment by ~A on ~A" (get-username (cdr (assoc :user-id item))) (get-post-title (cdr (assoc :post-id item))))
 461                        :link (generate-post-link (cdr (assoc :post-id item)) (cdr (assoc :--id item)) t)
 462                        :body (clean-html (cdr (assoc :html-body item))))))))))
 463
 464 (defparameter *fonts-stylesheet-uris*
 465   '("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"
 466     "https://fonts.greaterwrong.com/?fonts=BitmapFonts,FontAwesomeGW&base64encode=1"))
 467 ;(defparameter *fonts-stylesheet-uris* '("https://fonts.greaterwrong.com/?fonts=*"))
 468
 469 (defvar *fonts-redirect-data* nil)
 470 (sb-ext:defglobal *fonts-redirect-lock* (make-mutex))
 471 (sb-ext:defglobal *fonts-redirect-thread* nil)
 472
 473 (defun generate-fonts-links ()
 474   (let ((current-time (get-unix-time)))
 475     (labels ((get-redirects (uri-list)
 476                (loop for request-uri in uri-list collect
 477                      (multiple-value-bind (body status headers uri)
 478                        (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"))
 479                        (declare (ignore body uri))
 480                        (let ((location (cdr (assoc :location headers))))
 481                          (if (and (typep status 'integer) (< 300 status 400) location)
 482                              location
 483                              nil)))))
 484              (update-redirects ()
 485                (handler-case
 486                  (let* ((new-redirects (get-redirects *fonts-stylesheet-uris*))
 487                         (new-redirects (loop for new-redirect in new-redirects
 488                                              for original-uri in *fonts-stylesheet-uris*
 489                                              collect (if new-redirect (quri:render-uri (quri:merge-uris (quri:uri new-redirect) (quri:uri original-uri))) original-uri))))
 490                    (with-mutex (*fonts-redirect-lock*) (setf *fonts-redirect-data* (list *fonts-stylesheet-uris* new-redirects current-time)
 491                                                              *fonts-redirect-thread* nil))
 492                    new-redirects)
 493                  (serious-condition () *fonts-stylesheet-uris*)))
 494              (ensure-update-thread ()
 495                (with-mutex (*fonts-redirect-lock*)
 496                  (or *fonts-redirect-thread*
 497                      (setf *fonts-redirect-thread* (make-thread #'update-redirects :name "fonts redirect update"))))))
 498       (destructuring-bind (&optional base-uris redirect-uris timestamp) (with-mutex (*fonts-redirect-lock*) *fonts-redirect-data*)
 499         (if (and (eq base-uris *fonts-stylesheet-uris*) timestamp)
 500           (progn
 501             (if (>= current-time (+ timestamp 60))
 502                 (ensure-update-thread))
 503             (or redirect-uris *fonts-stylesheet-uris*))
 504           (update-redirects))))))
 505
 506 (defparameter *html-head*
 507   (format nil
 508 "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">
 509 <meta name=\"HandheldFriendly\" content=\"True\" />"))
 510
 511 (defparameter *extra-external-scripts* "")
 512 (defparameter *extra-inline-scripts* "")
 513
 514 (defun generate-versioned-link (file)
 515   (format nil "~A?v=~A" file (sb-posix:stat-mtime (sb-posix:stat (format nil "www~A" file)))))
 516
 517 (defun search-bar-to-html (out-stream)
 518   (declare (special *current-search-query*))
 519   (let ((query (and (boundp '*current-search-query*) (hunchentoot:escape-for-html *current-search-query*))))
 520     (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*))))
 521
 522 (defun inbox-to-html (out-stream user-slug &optional new-messages)
 523   (let* ((target-uri (format nil "/users/~A?show=inbox" user-slug))
 524          (as-link (string= (hunchentoot:request-uri*) target-uri)))
 525     (multiple-value-bind (nm-class nm-text)
 526       (if new-messages (values "new-messages" "New messages") (values "no-messages" "Inbox"))
 527       (format out-stream "<~:[a href=\"~A\"~;span~*~] id=\"inbox-indicator\" class=\"~A\" accesskey=\"o\" title=\"~A~:[ [o]~;~]\">~A</a>"
 528               as-link target-uri nm-class nm-text as-link nm-text))))
 529
 530 (defmethod site-nav-bars ((site site))
 531   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 532                      ("about" "/about" "About" :accesskey "t")
 533                      ("search" "/search" "Search" :html search-bar-to-html)
 534                      user-nav-item))
 535     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 536                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 537
 538 (defmethod site-nav-bars ((site lesswrong-viewer-site))
 539   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 540                      ("about" "/about" "About" :accesskey "t")
 541                      ("search" "/search" "Search" :html search-bar-to-html)
 542                      user-nav-item))
 543     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 544                    ("featured" "/index?view=featured" "Featured" :description "Latest featured posts" :accesskey "f")
 545                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 546                    ("meta" "/index?view=meta" "Meta" :description "Latest meta posts" :accesskey "m")
 547                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 548
 549 (defmethod site-nav-bars ((site ea-forum-viewer-site))
 550   '((:secondary-bar (("archive" "/archive" "Archive" :accesskey "r")
 551                      ("about" "/about" "About" :accesskey "t")
 552                      ("search" "/search" "Search" :html search-bar-to-html)
 553                      user-nav-item))
 554     (:primary-bar (("home" "/" "Home" :description "Latest frontpage posts" :accesskey "h")
 555                    ("all" "/index?view=all" "All" :description "Latest posts from all sections" :accesskey "a")
 556                    ("meta" "/index?view=community" "Community" :description "Latest community posts" :accesskey "m")
 557                    ("recent-comments" "/recentcomments" "<span>Recent </span>Comments" :description "Latest comments" :accesskey "c")))))
 558
 559 (defun prepare-nav-bar (nav-bar current-uri)
 560   (list (first nav-bar)
 561         (map 'list (lambda (item) (if (listp item) item (funcall item current-uri)))
 562              (second nav-bar))))
 563
 564 (defun nav-item-active (item current-uri)
 565   (when item
 566     (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 567       (declare (ignore id name description html accesskey nofollow trailing-html))
 568       (string= (or override-uri uri) current-uri))))
 569
 570 (defun nav-bar-active (nav-bar current-uri)
 571   (some (lambda (x) (nav-item-active x current-uri)) (second nav-bar)))
 572
 573 (defun nav-bar-inner (out-stream items &optional current-uri)
 574   (maplist (lambda (items)
 575              (let ((item (first items)))
 576                (destructuring-bind (id uri name &key description html accesskey nofollow trailing-html override-uri) item
 577                  (declare (ignore override-uri))
 578                  (let* ((item-active (nav-item-active item current-uri))
 579                         (nav-class (format nil "nav-item ~:[nav-inactive~;nav-current~]~:[~; nav-item-last-before-current~]"
 580                                            item-active (and (not item-active) (nav-item-active (cadr items) current-uri)))))
 581                      (format out-stream "<span id=\"nav-item-~A\" class=\"~A\" ~@[title=\"~A\"~]>"
 582                              id nav-class description)
 583                      (if html
 584                          (funcall html out-stream)
 585                          (link-if-not out-stream item-active uri "nav-inner" name :accesskey accesskey :nofollow nofollow))
 586                      (if trailing-html
 587                          (funcall trailing-html out-stream))
 588                      (format out-stream "</span>")))))
 589            items))
 590
 591 (defun nav-bar-outer (out-stream class nav-bar &optional current-uri)
 592   (format out-stream "<div id=\"~A\" class=\"nav-bar~@[ ~A~]\">" (string-downcase (first nav-bar)) class)
 593   (nav-bar-inner out-stream (second nav-bar) current-uri)
 594   (format out-stream "</div>"))
 595
 596 (defun nav-bar-to-html (out-stream &optional current-uri)
 597   (let* ((nav-bars (map 'list (lambda (x) (prepare-nav-bar x current-uri)) (site-nav-bars *current-site*)))
 598          (active-bar (or (find-if (lambda (x) (nav-bar-active x current-uri)) nav-bars) (car (last nav-bars))))
 599          (inactive-bars (remove active-bar nav-bars)))
 600     (dolist (bar inactive-bars)
 601       (nav-bar-outer out-stream "inactive-bar" bar current-uri))
 602     (nav-bar-outer out-stream "active-bar" active-bar current-uri)))
 603
 604 (defun user-nav-item (&optional current-uri)
 605   (if *read-only-mode*
 606       `("login" "/login" "Read Only Mode" :html ,(lambda () (format nil "<span class=\"nav-inner\" title=\"~A\">[Read Only Mode]</span>"
 607                                                                     (typecase *read-only-mode*
 608                                                                       (string *read-only-mode*)
 609                                                                       (t *read-only-default-message*)))))
 610       (alexandria:if-let (username (logged-in-username))
 611           (let ((user-slug (encode-entities (logged-in-user-slug))))
 612             `("login" ,(format nil "/users/~A" user-slug) ,(plump:encode-entities username) :description "User page" :accesskey "u"
 613               :trailing-html ,(lambda (out-stream) (inbox-to-html out-stream user-slug))))
 614           `("login" ,(format nil "/login?return=~A" (url-rewrite:url-encode current-uri)) "Log In" :accesskey "u" :nofollow t :override-uri "/login"))))
 615
 616 (defun sublevel-nav-to-html (out-stream options current &key default (base-uri (hunchentoot:request-uri*)) (param-name "show") (remove-params '("offset")) extra-class)
 617   (declare (type (or null string) extra-class))
 618   (format out-stream "<div class=\"sublevel-nav~@[ ~A~]\">" extra-class)
 619   (loop for item in options
 620         do (multiple-value-bind (param-value text) (if (atom item)
 621                                                        (values (string-downcase item) (string-capitalize item))
 622                                                        (values-list item))
 623              (let* ((selected (string-equal current param-value))
 624                     (class (if selected "sublevel-item selected" "sublevel-item")))
 625                (link-if-not out-stream selected (apply #'replace-query-params base-uri param-name (unless (string-equal param-value default) param-value)
 626                                                        (loop for x in remove-params nconc (list x nil)))
 627                             class text))))
 628   (format out-stream "</div>"))
 629
 630 (defun make-csrf-token (&optional (session-token (hunchentoot:cookie-in "session-token")) (nonce (ironclad:make-random-salt)))
 631   (if (typep session-token 'string) (setf session-token (base64:base64-string-to-usb8-array session-token)))
 632   (let ((csrf-token (concatenate '(vector (unsigned-byte 8)) nonce (ironclad:digest-sequence :sha256 (concatenate '(vector (unsigned-byte 8)) nonce session-token)))))
 633     (values (base64:usb8-array-to-base64-string csrf-token) csrf-token)))
 634
 635 (defun check-csrf-token (csrf-token &optional (session-token (hunchentoot:cookie-in "session-token")))
 636   (let* ((session-token (base64:base64-string-to-usb8-array session-token))
 637          (csrf-token (base64:base64-string-to-usb8-array csrf-token))
 638          (correct-token (nth-value 1 (make-csrf-token session-token (subseq csrf-token 0 16)))))
 639     (assert (ironclad:constant-time-equal csrf-token correct-token) nil "CSRF check failed.")
 640     t))
 641
 642 (defun generate-css-link ()
 643   (labels ((gen-inner (theme os)
 644              (generate-versioned-link (format nil "/css/style~@[-~A~].~A.css" (if (and theme (> (length theme) 0)) theme) os))))
 645     (let* ((ua (hunchentoot:header-in* :user-agent))
 646            (theme (hunchentoot:cookie-in "theme"))
 647            (os (cond ((search "Windows" ua) "windows")
 648                      ((search "Mac OS" ua) "mac")
 649                      (t "linux"))))
 650       (handler-case (gen-inner theme os)
 651         (serious-condition () (gen-inner nil os))))))
 652
 653 (defun html-body (out-stream fn &key title description current-uri content-class robots)
 654   (let* ((session-token (hunchentoot:cookie-in "session-token"))
 655          (csrf-token (and session-token (make-csrf-token session-token))))
 656     (format out-stream "<!DOCTYPE html><html lang=\"en-US\"><head>")
 657     (format out-stream "<script>window.GW = { }; loggedInUserId=\"~A\"; loggedInUserDisplayName=\"~A\"; loggedInUserSlug=\"~A\"; ~@[GW.csrfToken=\"~A\"; ~]~A</script>~A"
 658             (or (logged-in-userid) "")
 659             (or (logged-in-username) "")
 660             (or (logged-in-user-slug) "")
 661             csrf-token
 662             (load-time-value (with-open-file (s "www/head.js") (uiop:slurp-stream-string s)) t)
 663             *extra-inline-scripts*)
 664     (format out-stream "~A<link rel=\"stylesheet\" href=\"~A\">~{<link rel=\"stylesheet\" href=\"~A\">~}<link rel=\"shortcut icon\" href=\"~A\">"
 665             *html-head*
 666             (generate-css-link)
 667             (generate-fonts-links)
 668             (generate-versioned-link "/assets/favicon.ico"))
 669     (format out-stream "<script src=\"~A\" async></script>~A"
 670             (generate-versioned-link "/script.js")
 671             *extra-external-scripts*)
 672     (format out-stream "<title>~@[~A - ~]~A</title>~@[<meta name=\"description\" content=\"~A\">~]~@[<meta name=\"robots\" content=\"~A\">~]"
 673             (if title (encode-entities title))
 674             (site-title *current-site*)
 675             description
 676             robots)
 677     (format out-stream "</head>"))
 678   (unwind-protect
 679     (progn
 680       (format out-stream "<body><div id=\"content\"~@[ class=\"~A\"~]>"
 681               content-class)
 682       (nav-bar-to-html out-stream (or current-uri (replace-query-params (hunchentoot:request-uri*) "offset" nil "sort" nil)))
 683       (force-output out-stream)
 684       (funcall fn))
 685     (format out-stream "</div></body></html>")))
 686
 687 (defun replace-query-params (uri &rest params)
 688   (let* ((quri (quri:uri uri))
 689          (old-params (quri:uri-query-params quri))
 690          (new-params (loop with out = old-params
 691                            for (param value) on params by #'cddr
 692                            do (if value
 693                                   (alexandria:if-let (old-cons (assoc param out :test #'equal))
 694                                                      (setf (cdr old-cons) value)
 695                                                      (setf out (nconc out (list (cons param value)))))
 696                                   (setf out (remove-if (lambda (x) (equal (car x) param)) out)))
 697                            finally (return out))))
 698     (if new-params
 699       (setf (quri:uri-query-params quri) new-params)
 700       (setf (quri:uri-query quri) nil))
 701     (quri:render-uri quri)))
 702
 703 (defun pagination-nav-bars (&key offset total with-next (items-per-page (user-pref :items-per-page)))
 704   (lambda (out-stream fn)
 705     (labels ((pages-to-end (n) (< (+ offset (* items-per-page n)) total)))
 706       (let* ((with-next (if total (pages-to-end 1) with-next))
 707              (next (if (and offset with-next) (+ offset items-per-page)))
 708              (prev (if (and offset (>= offset items-per-page)) (- offset items-per-page)))
 709              (request-uri (hunchentoot:request-uri*))
 710              (first-uri (if (and prev (> prev 0)) (replace-query-params request-uri "offset" nil)))
 711              (prev-uri (if prev (replace-query-params request-uri "offset" (if (= prev 0) nil prev))))
 712              (next-uri (if next (replace-query-params request-uri "offset" next)))
 713              (last-uri (if (and total offset (pages-to-end 2))
 714                            (replace-query-params request-uri "offset" (- total (mod (- total 1) items-per-page) 1)))))
 715         (if (or next prev last-uri)
 716           (labels ((write-item (uri class title accesskey)
 717                      (format out-stream "<a href=\"~A\" class=\"button nav-item-~A~:[ disabled~;~]\" title=\"~A [~A]\" accesskey=\"~A\"></a>"
 718                              (or uri "#") class uri title accesskey accesskey)))
 719             (format out-stream "<div id='top-nav-bar'>")
 720             (write-item first-uri "first" "First page" "\\")
 721             (write-item prev-uri "prev" "Previous page" "[")
 722             (format out-stream "<span class='page-number'><span class='page-number-label'>Page</span> ~A</span>" (+ 1 (/ (or offset 0) items-per-page)))
 723             (write-item next-uri "next" "Next page" "]")
 724             (write-item last-uri "last" "Last page" "/")
 725             (format out-stream "</div>")))
 726         (funcall fn)
 727         (nav-bar-outer out-stream nil (list :bottom-bar
 728                                             (list-cond
 729                                              (first-uri `("first" ,first-uri "Back to first"))
 730                                              (prev-uri `("prev" ,prev-uri "Previous" :nofollow t))
 731                                              (t `("top" "#top" "Back to top"))
 732                                              (next-uri `("next" ,next-uri "Next" :nofollow t))
 733                                              (last-uri `("last" ,last-uri "Last" :nofollow t)))))
 734         (format out-stream "<script>document.querySelectorAll('#bottom-bar').forEach(bb => { bb.classList.add('decorative'); });</script>")))))
 735
 736 (defun map-output (out-stream fn list)
 737   (loop for item in list do (write-string (funcall fn item) out-stream)))
 738
 739 (defmacro with-outputs ((out-stream) &body body)
 740   (alexandria:with-gensyms (stream-sym)
 741                            (let ((out-body (map 'list (lambda (x) `(princ ,x ,stream-sym)) body)))
 742                              `(let ((,stream-sym ,out-stream))
 743                                 ,.out-body))))
 744
 745 (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)
 746   (declare (ignore return-code))
 747   (ignore-errors
 748     (log-conditions
 749       (html-body out-stream
 750                  (lambda ()
 751                    (when top-nav (funcall top-nav out-stream))
 752                    (funcall pagination out-stream fn))
 753                  :title title :description description :current-uri current-uri :content-class content-class :robots robots)
 754       (force-output out-stream))))
 755
 756 (defun set-cookie (key value &key (max-age (- (expt 2 31) 1)) (path "/"))
 757   (hunchentoot:set-cookie key :value value :path path :max-age max-age :secure (site-secure *current-site*)))
 758
 759 (defun set-default-headers (return-code)
 760   (let ((push-option (if (hunchentoot:cookie-in "push") '("nopush"))))
 761     (setf (hunchentoot:content-type*) "text/html; charset=utf-8"
 762           (hunchentoot:return-code*) return-code
 763           (hunchentoot:header-out :link) (format nil "~:{<~A>;rel=preload;type=~A;as=~A~@{;~A~}~:^,~}"
 764                                                  `((,(generate-css-link) "text/css" "style" ,.push-option)
 765                                                    ,.(loop for link in (generate-fonts-links)
 766                                                            collect (list* link "text/css" "style" push-option))
 767                                                    (,(generate-versioned-link "/script.js") "text/javascript" "script" ,.push-option))))
 768     (unless push-option (set-cookie "push" "t" :max-age (* 4 60 60)))))
 769
 770 (defun user-pref (key)
 771   (or (cdr (assoc key *current-prefs*))
 772       (cdr (assoc key *default-prefs*))))
 773
 774 (defun set-user-pref (key value)
 775   (assert (boundp 'hunchentoot:*reply*))
 776   (setf *current-prefs* (remove-duplicates (acons key value *current-prefs*) :key #'car :from-end t))
 777   (set-cookie "prefs" (quri:url-encode (json:encode-json-to-string *current-prefs*))))
 778
 779 (defmacro with-response-stream ((out-stream) &body body) `(call-with-response-stream (lambda (,out-stream) ,.body)))
 780
 781 (defun call-with-response-stream (fn)
 782   (let ((*html-output* (make-flexi-stream (hunchentoot:send-headers) :external-format :utf-8)))
 783     (funcall fn *html-output*)))
 784
 785 (defmacro emit-page ((out-stream &rest args &key (return-code 200) &allow-other-keys) &body body)
 786   (alexandria:once-only (return-code)
 787     `(progn
 788        (set-default-headers ,return-code)
 789        (with-response-stream (,out-stream)
 790          (call-with-emit-page ,out-stream
 791                               (lambda () ,@body)
 792                               ,@args)))))
 793
 794 (defun call-with-error-page (fn)
 795   (let* ((lw2-status
 796            (alexandria:if-let (status-string (hunchentoot:cookie-in "lw2-status"))
 797              (if (string= status-string "") nil
 798                  (let ((json:*identifier-name-to-key* #'json:safe-json-intern))
 799                    (json:decode-json-from-string status-string)))))
 800          (*current-prefs*
 801            (alexandria:if-let (prefs-string (hunchentoot:cookie-in "prefs"))
 802              (let ((json:*identifier-name-to-key* 'json:safe-json-intern))
 803                (ignore-errors (json:decode-json-from-string (quri:url-decode prefs-string)))))))
 804     (with-site-context ((let ((host (or (hunchentoot:header-in* :x-forwarded-host) (hunchentoot:header-in* :host))))
 805                           (or (find-site host)
 806                               (error "Unknown site: ~A" host))))
 807       (multiple-value-bind (*current-auth-token* *current-userid* *current-username*)
 808         (if *read-only-mode*
 809             (values)
 810             (alexandria:if-let
 811               (auth-token
 812                 (alexandria:if-let
 813                   (at (hunchentoot:cookie-in "lw2-auth-token"))
 814                   (if (or (string= at "") (not lw2-status) (> (get-unix-time) (- (cdr (assoc :expires lw2-status)) (* 60 60 24))))
 815                       nil at)))
 816               (with-cache-readonly-transaction
 817                 (values
 818                   auth-token
 819                   (cache-get "auth-token-to-userid" auth-token)
 820                   (cache-get "auth-token-to-username" auth-token)))))
 821         (let ((*current-user-slug* (and *current-userid* (get-user-slug *current-userid*))))
 822           (handler-case
 823             (log-conditions
 824               (funcall fn))
 825             (serious-condition (condition)
 826               (emit-page (out-stream :title "Error" :return-code (condition-http-return-code condition) :content-class "error-page")
 827                          (error-to-html out-stream condition)))))))))
 828
 829 (defmacro with-error-page (&body body)
 830   `(call-with-error-page (lambda () ,@body)))
 831
 832 (defun output-form (out-stream method action id heading csrf-token fields button-label &key textarea end-html)
 833   (format out-stream "<form method=\"~A\" action=\"~A\" id=\"~A\"><h1>~A</h1>" method action id heading)
 834   (loop for (id label type . params) in fields
 835         do (format out-stream "<label for=\"~A\">~A:</label>" id label)
 836         do (cond
 837              ((string= type "select")
 838               (destructuring-bind (option-list &optional default) params
 839                 (format out-stream "<select name=\"~A\">" id)
 840                 (loop for (value label) in option-list
 841                       do (format out-stream "<option value=\"~A\"~:[~; selected~]>~A</option>" value (string= default value) label))
 842                 (format out-stream "</select>")))
 843              (t
 844                (destructuring-bind (&optional (autocomplete "off") default) params
 845                  (format out-stream "<input type=\"~A\" name=\"~A\" autocomplete=\"~A\"~@[ value=\"~A\"~]>" type id autocomplete (and default (encode-entities default))))))
 846         do (format out-stream ""))
 847   (if textarea
 848     (destructuring-bind (ta-name ta-contents) textarea
 849       (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))))
 850   (format out-stream "<input type=\"hidden\" name=\"csrf-token\" value=\"~A\"><input type=\"submit\" value=\"~A\">~@[~A~]</form>"
 851           csrf-token button-label end-html))
 852
 853 (defun page-toolbar-to-html (out-stream &key title new-post new-conversation logout (rss t))
 854   (let ((liu (logged-in-userid)))
 855     (format out-stream "<div class=\"page-toolbar\">")
 856     (when logout
 857       (format out-stream "<form method=\"post\" action=\"/logout\"><button class=\"logout-button button\" name=\"logout\" value=\"~A\">Log out</button></form>"
 858               (make-csrf-token)))
 859     (when (and new-conversation liu)
 860       (multiple-value-bind (text to)
 861         (typecase new-conversation (string (values "Send private message" new-conversation)) (t "New conversation"))
 862         (format out-stream "<a class=\"new-private-message button\" href=\"/conversation~@[?to=~A~]\">~A</a>"
 863                 to text)))
 864     (when (and new-post liu)
 865       (format out-stream "<a class=\"new-post button\" href=\"/edit-post~@[?section=~A~]\" accesskey=\"n\" title=\"Create new post [n]\">New post</a>"
 866               (typecase new-post (string new-post) (t nil))))
 867     (when (and title rss)
 868       (format out-stream "<a class=\"rss\" rel=\"alternate\" type=\"application/rss+xml\" title=\"~A RSS feed\" href=\"~A\">RSS</a>"
 869               title (replace-query-params (hunchentoot:request-uri*) "offset" nil "format" "rss")))
 870     (format out-stream "</div>")))
 871
 872 (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"))
 873   (alexandria:switch ((hunchentoot:get-parameter "format") :test #'string=)
 874                      ("rss"
 875                       (setf (hunchentoot:content-type*) "application/rss+xml; charset=utf-8")
 876                       (with-response-stream (out-stream)
 877                         (write-index-items-to-rss out-stream items :title title)))
 878                      (t
 879                        (emit-page (out-stream :title (if hide-title nil title) :description (site-description *current-site*) :content-class content-class
 880                                               :current-uri current-uri :robots (if (hunchentoot:get-parameter :offset) "noindex, nofollow")
 881                                               :pagination pagination :top-nav top-nav)
 882                                   (write-index-items-to-html out-stream items
 883                                                              :need-auth need-auth
 884                                                              :skip-section section)))))
 885
 886 (defun link-if-not (stream linkp url class text &key accesskey nofollow)
 887   (declare (dynamic-extent linkp url text))
 888   (if (not linkp)
 889       (format stream "<a href=\"~A\" class=\"~A\"~@[ accesskey=\"~A\"~]~:[~; rel=\"nofollow\"~]>~A</a>" url class accesskey nofollow text)
 890       (format stream "<span class=\"~A\">~A</span>" class text)))
 891
 892 (defun postprocess-markdown (markdown)
 893   (ppcre:regex-replace-all (concatenate 'string (ppcre:regex-replace-all "\\." (site-uri *current-site*) "\\.") "posts/([^/ ]{17})/([^/# ]*)(?:#comment-([^/ ]{17})|/comment/([^/ ]{17}))?")
 894                            markdown
 895                            (lambda (target-string start end match-start match-end reg-starts reg-ends)
 896                              (declare (ignore start end match-start match-end))
 897                              (labels ((reg (n) (if (and (> (length reg-starts) n) (aref reg-starts n))
 898                                                    (substring target-string (aref reg-starts n) (aref reg-ends n)))))
 899                                (format nil "https://www.lesswrong.com/posts/~A/~A~@[#~A~]" (reg 0) (reg 1) (or (reg 2) (reg 3)))))))
 900
 901 (defun post-or-get-parameter (name)
 902   (or (hunchentoot:post-parameter name) (hunchentoot:get-parameter name)))
 903
 904 (defun redirect (uri &key (type :see-other))
 905   (setf (hunchentoot:return-code*) (ecase type (:see-other 303) (:permanent 301))
 906         (hunchentoot:header-out "Location") uri))
 907
 908 (defmacro ignorable-multiple-value-bind ((&rest bindings) value-form &body body)
 909   (let (new-bindings ignores)
 910     (dolist (binding (reverse bindings))
 911       (if (eq binding '*)
 912           (let ((gensym (gensym)))
 913             (push gensym new-bindings)
 914             (push gensym ignores))
 915           (push binding new-bindings)))
 916     `(multiple-value-bind ,new-bindings ,value-form
 917          (declare (ignore ,.ignores))
 918        ,@body)))
 919
 920 (defmacro define-page (name path-specifier additional-vars &body body)
 921   (labels ((make-lambda (args)
 922              (loop for a in args
 923                    collect (if (atom a) a (first a))))
 924            (filter-plist (plist &rest args)
 925              (declare (dynamic-extent args))
 926              (map-plist (lambda (key val) (when (member key args) (list key val))) plist))
 927            (make-hunchentoot-lambda (args)
 928              (loop for x in args
 929                    collect (if (atom x) x
 930                                (cons (first x) (filter-plist (rest x) :request-type :real-name)))))
 931            (make-binding-form (additional-vars body &aux var-bindings additional-declarations additional-preamble)
 932              (loop for x in additional-vars
 933                 when (not (eq x '*))
 934                 do
 935                   (destructuring-bind (name &key member type default required request-type real-name) (if (atom x) (list x) x)
 936                     (declare (ignore request-type real-name))
 937                     (let* ((inner-form
 938                             (cond
 939                               (member
 940                                `(let ((sym (find-symbol (string-upcase ,name) ,(find-package '#:keyword))))
 941                                   (if (member sym (quote ,member)) sym)))
 942                               ((and type (subtypep type 'integer))
 943                                `(if ,name (parse-integer ,name)))))
 944                            (inner-form
 945                             (if default
 946                                 `(or ,inner-form ,default)
 947                                 inner-form)))
 948                       (when required
 949                         (push `(unless (and ,name (not (equal ,name ""))) (error "Missing required parameter: ~A" (quote ,name)))
 950                               additional-preamble))
 951                       (if member
 952                           (if type (error "Cannot specify both member and type.")
 953                               (push `(type (or null symbol) ,name) additional-declarations))
 954                           (if type
 955                               (push `(type (or null ,type) ,name) additional-declarations)
 956                               (push `(type (or null simple-string) ,name) additional-declarations)))
 957                       (when inner-form
 958                         (push `(,name ,inner-form) var-bindings)))))
 959              `(let ,var-bindings (declare ,@additional-declarations) ,@additional-preamble ,@body)))
 960    (multiple-value-bind (path-specifier-form path-bindings-wrapper specifier-vars)
 961     (if (stringp path-specifier)
 962         (values path-specifier #'identity)
 963         (destructuring-bind (specifier-type specifier-body &rest specifier-args) path-specifier
 964           (ecase specifier-type
 965             (:function
 966               (values `(lambda (r) (funcall ,specifier-body (hunchentoot:request-uri r)))
 967                       (if specifier-args
 968                           (lambda (body) `(ignorable-multiple-value-bind ,(make-lambda specifier-args) (funcall ,specifier-body (hunchentoot:request-uri*)) ,body))
 969                           #'identity)
 970                       specifier-args))
 971             (:regex
 972               (let ((fn `(lambda (r) (ppcre:scan-to-strings ,specifier-body (hunchentoot:request-uri r)))))
 973                 (values fn
 974                         (lambda (body)
 975                           (alexandria:with-gensyms (result-vector)
 976                             `(let ((,result-vector (nth-value 1 (funcall ,fn hunchentoot:*request*))))
 977                                (declare (type simple-vector ,result-vector))
 978                                (let
 979                                  ,(loop for v in (make-lambda specifier-args) as x from 0 collecting `(,v (if (> (length ,result-vector) ,x) (aref ,result-vector ,x))))
 980                                  ,body))))
 981                         specifier-args))))))
 982      (let* ((rewritten-body
 983              (if (eq (ignore-errors (caar body)) 'request-method)
 984                  (progn
 985                    (unless (= (length body) 1)
 986                      (error "REQUEST-METHOD must be the only form when it appears in DEFINE-PAGE."))
 987                    `((ecase (hunchentoot:request-method*)
 988                        ,.(loop for method-body in (cdar body)
 989                             collect (destructuring-bind (method args &body inner-body) method-body
 990                                       (unless (eq method :get)
 991                                         (alexandria:with-gensyms (csrf-token)
 992                                           (push `(,csrf-token :real-name "csrf-token" :required t) args)
 993                                           (push `(check-csrf-token ,csrf-token) inner-body)))
 994                                       (loop for a in args
 995                                          do (push (append (if (atom a) (list a) (cons (first a) (filter-plist (rest a) :real-name))) (list :request-type method)) additional-vars))
 996                                       `(,method ,(make-binding-form args inner-body)))))))
 997                  body)))
 998        `(hunchentoot:define-easy-handler (,name :uri ,path-specifier-form) ,(make-hunchentoot-lambda additional-vars)
 999           (with-error-page
1000               (block nil
1001                 ,(funcall path-bindings-wrapper
1002                           (make-binding-form (append specifier-vars additional-vars)
1003                                              rewritten-body)))))))))
1004
1005 (define-component sort-widget (&key (sort-options '(:new :hot)) (pref :default-sort) (param-name "sort") (html-class "sort"))
1006   (:http-args '((sort :alias param-name :member sort-options)))
1007   (let ((sort-string (if sort (string-downcase sort))))
1008     (if sort-string
1009         (set-user-pref :default-sort sort-string))
1010     (renderer (out-stream)
1011       (sublevel-nav-to-html out-stream
1012                             sort-options
1013                             (user-pref pref)
1014                             :param-name param-name
1015                             :extra-class html-class))
1016     (or sort-string (user-pref pref))))
1017
1018 (define-page view-root "/" ((offset :type fixnum)
1019                             (limit :type fixnum))
1020   (component-value-bind ((sort-string sort-widget))
1021     (multiple-value-bind (posts total)
1022       (get-posts-index :offset offset :limit (or limit (user-pref :items-per-page)) :sort sort-string)
1023       (view-items-index posts
1024                         :section :frontpage :title "Frontpage posts" :hide-title t
1025                         :pagination (pagination-nav-bars :offset (or offset 0) :total total :with-next (not total))
1026                         :top-nav (lambda (out-stream)
1027                                    (page-toolbar-to-html out-stream
1028                                                          :title "Frontpage posts"
1029                                                          :new-post t)
1030                                    (funcall sort-widget out-stream))))))
1031
1032 (define-page view-index "/index" ((view :member (:all :new :frontpage :featured :meta :community :alignment-forum :questions) :default :all)
1033                                   before after
1034                                   (offset :type fixnum)
1035                                   (limit :type fixnum))
1036   (when (eq view :new) (redirect (replace-query-params (hunchentoot:request-uri*) "view" "all" "all" nil) :type :permanent) (return))
1037   (component-value-bind ((sort-string sort-widget))
1038     (multiple-value-bind (posts total)
1039       (get-posts-index :view (string-downcase view) :before before :after after :offset offset :limit (or limit (user-pref :items-per-page)) :sort sort-string)
1040       (let ((page-title (format nil "~@(~A posts~)" view)))
1041         (view-items-index posts
1042                           :section view :title page-title
1043                           :pagination (pagination-nav-bars :offset (or offset 0) :total total :with-next (not total))
1044                           :content-class (format nil "index-page ~(~A~)-index-page" view)
1045                           :top-nav (lambda (out-stream)
1046                                      (page-toolbar-to-html out-stream
1047                                                            :title page-title
1048                                                            :new-post (if (eq view :meta) "meta" t))
1049                                      (if (member view '(:all))
1050                                          (funcall sort-widget out-stream))))))))
1051
1052 (define-page view-post "/post" ((id :required t))
1053   (redirect (generate-post-link id) :type :permanent))
1054
1055 (define-page view-post-lw1-link (:function #'match-lw1-link) ()
1056   (redirect (convert-lw1-link (hunchentoot:request-uri*)) :type :permanent))
1057
1058 (define-page view-post-lw2-slug-link (:function #'match-lw2-slug-link) ()
1059   (redirect (convert-lw2-slug-link (hunchentoot:request-uri*)) :type :see-other))
1060
1061 (define-page view-post-lw2-sequence-link (:function #'match-lw2-sequence-link) ()
1062   (redirect (convert-lw2-sequence-link (hunchentoot:request-uri*)) :type :see-other))
1063
1064 (define-page view-feed "/feed" ()
1065   (redirect "/?format=rss" :type :permanent))
1066
1067 (define-page view-post-lw2-link (:function #'match-lw2-link post-id comment-id * comment-link-type) (need-auth chrono)
1068   (request-method
1069     (:get ()
1070      (let ((lw2-auth-token *current-auth-token*))
1071        (labels ((output-comments (out-stream id comments target)
1072                   (format out-stream "<div id=\"~A\" class=\"comments\">" id)
1073                   (with-error-html-block (out-stream)
1074                     (if target
1075                         (comment-thread-to-html out-stream
1076                                                 (lambda ()
1077                                                   (comment-item-to-html
1078                                                     out-stream
1079                                                     target
1080                                                     :extra-html-fn (lambda (c-id)
1081                                                                      (let ((*comment-individual-link* nil))
1082                                                                        (comment-tree-to-html out-stream (make-comment-parent-hash comments) c-id))))))
1083                         (if comments
1084                             (if chrono
1085                                 (comment-chrono-to-html out-stream comments)
1086                                 (comment-tree-to-html out-stream (make-comment-parent-hash comments)))
1087                             <div class="comments-empty-message">(if (string= id "answers") "No answers." "No comments.")</div>)))
1088                   (format out-stream "</div>"))
1089                 (output-comments-votes (out-stream)
1090                   (handler-case
1091                     (when lw2-auth-token
1092                       (format out-stream "<script>commentVotes=~A</script>"
1093                               (json:encode-json-to-string (get-post-comments-votes post-id lw2-auth-token))))
1094                     (t () nil)))
1095                 (output-post-vote (out-stream)
1096                   (handler-case
1097                     (format out-stream "<script>postVote=~A</script>"
1098                             (json:encode-json-to-string (get-post-vote post-id lw2-auth-token)))
1099                     (t () nil))))
1100          (multiple-value-bind (post title condition)
1101            (handler-case (nth-value 0 (get-post-body post-id :auth-token (and need-auth lw2-auth-token)))
1102              (serious-condition (c) (values nil "Error" c))
1103              (:no-error (post) (values post (cdr (assoc :title post)) nil)))
1104            (if comment-id
1105                (let* ((*comment-individual-link* t)
1106                       (comment-thread-type (if (string= comment-link-type "answer") :answer :comment))
1107                       (comments (case comment-thread-type
1108                                   (:comment (get-post-comments post-id))
1109                                   (:answer (get-post-answers post-id))))
1110                       (target-comment (find comment-id comments :key (lambda (c) (cdr (assoc :--id c))) :test #'string=))
1111                       (display-name (get-username (cdr (assoc :user-id target-comment))))
1112                       (verb-phrase (cond
1113                                      ((and (eq comment-thread-type :answer)
1114                                            (not (cdr (assoc :parent-comment-id target-comment))))
1115                                       "answers")
1116                                      (t "comments on"))))
1117                  (emit-page (out-stream :title (format nil "~A ~A ~A" display-name verb-phrase title)
1118                                         :content-class "individual-thread-page comment-thread-page")
1119                             (format out-stream "<h1 class=\"post-title\">~A ~A <a href=\"~A\">~A</a></h1>"
1120                                     (encode-entities display-name)
1121                                     verb-phrase
1122                                     (generate-post-link post-id)
1123                                     (clean-text-to-html title :hyphenation nil))
1124                             (output-comments out-stream "comments" comments target-comment)
1125                             (when lw2-auth-token
1126                               (force-output out-stream)
1127                               (output-comments-votes out-stream))))
1128              (emit-page (out-stream :title title :content-class (format nil "post-page comment-thread-page~:[~; question-post-page~]" (cdr (assoc :question post))))
1129                         (cond
1130                           (condition
1131                             (error-to-html out-stream condition))
1132                           (t
1133                            (post-body-to-html post)))
1134                         (when (and lw2-auth-token (equal (logged-in-userid) (cdr (assoc :user-id post))))
1135                           (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>"
1136                                   (cdr (assoc :--id post))))
1137                         (force-output out-stream)
1138                         (handler-case
1139                             (let* ((question (cdr (assoc :question post)))
1140                                    (answers (when question
1141                                               (get-post-answers post-id)))
1142                                    (comments (get-post-comments post-id)))
1143                               (when question
1144                                 (output-comments out-stream "answers" answers nil))
1145                               (output-comments out-stream "comments" comments nil))
1146                           (serious-condition (c) (error-to-html out-stream c)))
1147                         (when lw2-auth-token
1148                           (force-output out-stream)
1149                           (output-post-vote out-stream)
1150                           (output-comments-votes out-stream))))))))
1151     (:post (csrf-token text answer parent-answer-id parent-comment-id edit-comment-id retract-comment-id unretract-comment-id delete-comment-id)
1152      (let ((lw2-auth-token *current-auth-token*))
1153        (check-csrf-token csrf-token)
1154        (assert lw2-auth-token)
1155        (let ((question (cdr (assoc :question (get-post-body post-id :auth-token lw2-auth-token))))
1156              (new-comment-id
1157               (cond
1158                 (text
1159                  (let ((comment-data
1160                         (list-cond
1161                          (t :body (postprocess-markdown text))
1162                          (t :last-edited-as "markdown")
1163                          ((not edit-comment-id) :post-id post-id)
1164                          (parent-comment-id :parent-comment-id parent-comment-id)
1165                          (answer :answer t)
1166                          (parent-answer-id :parent-answer-id parent-answer-id))))
1167                    (if edit-comment-id
1168                        (prog1 edit-comment-id
1169                          (do-lw2-comment-edit lw2-auth-token edit-comment-id comment-data))
1170                        (do-lw2-comment lw2-auth-token comment-data))))
1171                 (retract-comment-id
1172                  (do-lw2-comment-edit lw2-auth-token retract-comment-id '((:retracted . t))))
1173                 (unretract-comment-id
1174                  (do-lw2-comment-edit lw2-auth-token unretract-comment-id '((:retracted . nil))))
1175                 (delete-comment-id
1176                  (do-lw2-comment-edit lw2-auth-token delete-comment-id '((:deleted . t) (:deleted-public . t)
1177                                                                          (:deleted-reason . "Comment deleted by its author.")))
1178                  nil))))
1179          (ignore-errors
1180            (get-post-comments post-id :force-revalidate t)
1181            (when question
1182              (get-post-answers post-id :force-revalidate t)))
1183          (when text
1184            (cache-put "comment-markdown-source" new-comment-id text)
1185            (redirect (generate-post-link (match-lw2-link (hunchentoot:request-uri*)) new-comment-id))))))))
1186
1187 (defparameter *edit-post-template* (compile-template* "edit-post.html"))
1188
1189 (define-page view-edit-post "/edit-post" (title url section post-id link-post)
1190   (request-method
1191     (:get ()
1192      (let* ((csrf-token (make-csrf-token))
1193             (post-body (if post-id (get-post-body post-id :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1194             (section (or section (loop for (sym . sec) in '((:draft . "drafts") (:meta . "meta") (:frontpage-date . "frontpage"))
1195                                        if (cdr (assoc sym post-body)) return sec
1196                                        finally (return "all")))))
1197        (emit-page (out-stream :title (if post-id "Edit Post" "New Post") :content-class "edit-post-page")
1198                   (render-template* *edit-post-template* out-stream
1199                                     :csrf-token csrf-token
1200                                     :title (cdr (assoc :title post-body))
1201                                     :url (cdr (assoc :url post-body))
1202                                     :question (cdr (assoc :question post-body))
1203                                     :post-id post-id
1204                                     :section-list (loop for (name desc) in '(("all" "All") ("meta" "Meta") ("drafts" "Drafts"))
1205                                                         collect (alist :name name :desc desc :selected (string= name section)))
1206                                     :markdown-source (or (and post-id (cache-get "post-markdown-source" post-id)) (cdr (assoc :html-body post-body)) "")))))
1207     (:post (text question)
1208      (let ((lw2-auth-token *current-auth-token*)
1209            (url (if (string= url "") nil url)))
1210        (assert lw2-auth-token)
1211        (let* ((post-data
1212                (list-cond
1213                 (t :body (postprocess-markdown text))
1214                 (t :title title)
1215                 (t :last-edited-as "markdown")
1216                 (t :url (if link-post url))
1217                 (t :meta (string= section "meta"))
1218                 (t :draft (string= section "drafts"))
1219                 ((not post-id) :question (and question t))))
1220               (post-set (loop for item in post-data when (cdr item) collect item))
1221               (post-unset (loop for item in post-data when (not (cdr item)) collect (cons (car item) t))))
1222          (let* ((new-post-data
1223                   (if post-id
1224                       (do-lw2-post-edit lw2-auth-token post-id post-set post-unset)
1225                       (do-lw2-post lw2-auth-token post-set)))
1226                 (new-post-id (cdr (assoc :--id new-post-data))))
1227            (assert new-post-id)
1228            (cache-put "post-markdown-source" new-post-id text)
1229            (ignore-errors (get-post-body post-id :force-revalidate t))
1230            (redirect (if (cdr (assoc "draft" post-data :test #'equal))
1231                          (concatenate 'string (generate-post-link new-post-data) "?need-auth=y")
1232                          (generate-post-link new-post-data)))))))))
1233
1234 (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))
1235   (with-error-page
1236     (check-csrf-token csrf-token)
1237     (let ((lw2-auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1238       (multiple-value-bind (points vote-type) (do-lw2-vote lw2-auth-token target target-type vote-type)
1239         (json:encode-json-to-string (list (pretty-number points "point") vote-type))))))
1240
1241 (hunchentoot:define-easy-handler (view-check-notifications :uri "/check-notifications") ()
1242                                  (with-error-page
1243                                    (if *current-auth-token*
1244                                        (let ((notifications-status (check-notifications (logged-in-userid) *current-auth-token*)))
1245                                          (json:encode-json-to-string notifications-status)))))
1246
1247 (define-page view-recent-comments "/recentcomments" ((offset :type fixnum)
1248                                                      (limit :type fixnum))
1249   (let ((want-total (not (typep *current-backend* 'backend-lw2)))) ; jumping to last page causes LW2 to explode
1250     (multiple-value-bind (recent-comments total)
1251       (if (or offset limit (/= (user-pref :items-per-page) 20))
1252           (lw2-graphql-query (lw2-query-string :comment :list
1253                                                (remove nil (alist :view "postCommentsNew" :limit (or limit (user-pref :items-per-page)) :offset offset)
1254                                                        :key #'cdr)
1255                                                (comments-index-fields)
1256                                                :with-total want-total))
1257           (get-recent-comments :with-total want-total))
1258       (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))))))
1259
1260 (define-page view-user (:regex "^/users/(.*?)(?:$|\\?)|^/user" user-slug) (id
1261                                                                              (offset :type fixnum :default 0)
1262                                                                              (show :member (:all :posts :comments :drafts :conversations :inbox) :default :all)
1263                                                                              (sort :member (:top :new) :default :new))
1264              (let* ((auth-token (if (eq show :inbox) *current-auth-token*))
1265                     (user-query-terms (cond
1266                                         (user-slug (alist :slug user-slug))
1267                                         (id (alist :document-id id))))
1268                     (user-info
1269                       (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))))
1270                                                    :auth-token auth-token)))
1271                         (if (cdr (assoc :--id ui))
1272                             ui
1273                             (error (make-condition 'lw2-user-not-found-error)))))
1274                     (user-id (cdr (assoc :--id user-info)))
1275                     (own-user-page (logged-in-userid user-id))
1276                     (comments-index-fields (remove :page-url (comments-index-fields))) ; page-url sometimes causes "Cannot read property '_id' of undefined" error
1277                     (display-name (if user-slug (cdr (assoc :display-name user-info)) user-id))
1278                     (show-text (if (not (eq show :all)) (string-capitalize show)))
1279                     (title (format nil "~A~@['s ~A~]" display-name show-text))
1280                     (sort-type (case sort (:top :score) (:new :date)))
1281                     (comments-base-terms (ecase sort-type (:score (load-time-value (alist :view "postCommentsTop"))) (:date (load-time-value (alist :view "allRecentComments"))))))
1282                (multiple-value-bind (items total)
1283                  (case show
1284                    (:posts
1285                      (get-user-posts user-id :offset offset :limit (+ 1 (user-pref :items-per-page)) :sort-type sort-type))
1286                    (:comments
1287                      (lw2-graphql-query (lw2-query-string :comment :list
1288                                                           (nconc (alist :offset offset :limit (+ 1 (user-pref :items-per-page)) :user-id user-id)
1289                                                                  comments-base-terms)
1290                                                           comments-index-fields)))
1291                    (:drafts
1292                      (get-user-posts user-id :drafts t :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1293                    (:conversations
1294                      (let ((conversations
1295                              (lw2-graphql-query (lw2-query-string :conversation :list
1296                                                                   (alist :view "userConversations" :limit (+ 1 (user-pref :items-per-page)) :offset offset :user-id user-id)
1297                                                                   '(:--id :created-at :title (:participants :display-name :slug) :----typename))
1298                                                 :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1299                        (lw2-graphql-query-map
1300                          (lambda (c)
1301                            (lw2-query-string* :message :total (alist :view "messagesConversation" :conversation-id (cdr (assoc :--id c))) nil))
1302                          conversations
1303                          :postprocess (lambda (c result)
1304                                         (acons :messages-total result c))
1305                          :auth-token (hunchentoot:cookie-in "lw2-auth-token"))))
1306                    (:inbox
1307                      (prog1
1308                        (let ((notifications (get-notifications :user-id user-id :offset offset :auth-token (hunchentoot:cookie-in "lw2-auth-token")))
1309                              (last-check (ignore-errors (local-time:parse-timestring (cdr (assoc :last-notifications-check user-info))))))
1310                          (labels ((check-new (key obj)
1311                                     (if (ignore-errors (local-time:timestamp< last-check (local-time:parse-timestring (cdr (assoc key obj)))))
1312                                         (acons :highlight-new t obj)
1313                                         obj)))
1314                            (lw2-graphql-query-map
1315                              (lambda (n)
1316                                (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1317                                                   ("comment"
1318                                                    (lw2-query-string* :comment :single
1319                                                                       (alist :document-id (cdr (assoc :document-id n)))
1320                                                                       (comments-index-fields)))
1321                                                   ("post"
1322                                                    (lw2-query-string* :post :single (alist :document-id (cdr (assoc :document-id n)))
1323                                                                       (posts-index-fields)))
1324                                                   ("message"
1325                                                    (lw2-query-string* :message :single (alist :document-id (cdr (assoc :document-id n)))
1326                                                                       *messages-index-fields*))
1327                                                   (t
1328                                                     (values n t))))
1329                              notifications
1330                              :postprocess (lambda (n result)
1331                                             (if result
1332                                                 (check-new
1333                                                   (alexandria:switch ((cdr (assoc :document-type n)) :test #'string=)
1334                                                                      ("comment" :posted-at)
1335                                                                      ("post" :posted-at)
1336                                                                      ("message" :created-at))
1337                                                   result)
1338                                                 n))
1339                              :auth-token auth-token)))
1340                        (do-user-edit
1341                          (hunchentoot:cookie-in "lw2-auth-token")
1342                          user-id
1343                          (alist :last-notifications-check
1344                                 (local-time:format-timestring nil (local-time:now)
1345                                                               :format lw2.graphql:+graphql-timestamp-format+
1346                                                               :timezone local-time:+utc-zone+)))))
1347                    (t
1348                      (let ((user-posts (get-user-posts user-id :limit (+ 1 (user-pref :items-per-page) offset)))
1349                            (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)
1350                                                                                comments-index-fields))))
1351                        (concatenate 'list user-posts user-comments))))
1352                  (let ((with-next (> (length items) (+ (if (eq show :all) offset 0) (user-pref :items-per-page))))
1353                        (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
1354                    (view-items-index interleave :title title
1355                                      :content-class (format nil "user-page~@[ ~A-user-page~]~:[~; own-user-page~]" show-text own-user-page)
1356                                      :current-uri (format nil "/users/~A" user-slug)
1357                                      :section :personal
1358                                      :pagination (pagination-nav-bars :offset offset :total total :with-next (if (not total) with-next))
1359                                      :need-auth (eq show :drafts) :section (if (eq show :drafts) "drafts" nil)
1360                                      :top-nav (lambda (out-stream)
1361                                                 (page-toolbar-to-html out-stream
1362                                                                       :title title
1363                                                                       :rss (not (member show '(:drafts :conversations :inbox)))
1364                                                                       :new-post (if (eq show :drafts) "drafts" t)
1365                                                                       :new-conversation (if own-user-page t user-slug)
1366                                                                       :logout own-user-page)
1367                                                 (format out-stream "<h1 class=\"page-main-heading\"~@[ ~A~]>~A</h1><div class=\"user-stats\">Karma: <span class=\"karma-total\">~A</span></div>"
1368                                                         (if (not own-user-page)
1369                                                             (if user-slug
1370                                                                 (format nil "data-anti-kibitzer-redirect=\"/user?id=~A\"" (cdr (assoc :--id user-info)))
1371                                                                 (format nil "data-kibitzer-redirect=\"/users/~A\"" (cdr (assoc :slug user-info)))))
1372                                                         (encode-entities display-name)
1373                                                         (if user-slug (pretty-number (or (cdr (assoc :karma user-info)) 0)) "##"))
1374                                                 (sublevel-nav-to-html out-stream
1375                                                                       `(:all :posts :comments
1376                                                                         ,@(if own-user-page
1377                                                                               '(:drafts :conversations :inbox)))
1378                                                                       show
1379                                                                       :default :all)
1380                                                 (when (member show '(:all :posts :comments))
1381                                                   (sublevel-nav-to-html out-stream
1382                                                                         '(:new :top)
1383                                                                         sort
1384                                                                         :default :new
1385                                                                         :param-name "sort"
1386                                                                         :extra-class "sort"))))))))
1387
1388 (defparameter *conversation-template* (compile-template* "conversation.html"))
1389
1390 (define-page view-conversation "/conversation" (id)
1391   (request-method
1392     (:get ()
1393      (let ((to (post-or-get-parameter "to")))
1394        (cond
1395          ((and id to) (error "This is an invalid URL."))
1396          (id
1397            (multiple-value-bind (conversation messages)
1398              (get-conversation-messages id (hunchentoot:cookie-in "lw2-auth-token"))
1399              (view-items-index (nreverse messages) :content-class "conversation-page" :need-auth t :title (encode-entities (postprocess-conversation-title (cdr (assoc :title conversation))))
1400                                :top-nav (lambda (out-stream) (render-template* *conversation-template* out-stream
1401                                                                                :conversation conversation :csrf-token (make-csrf-token))))))
1402          (t
1403           (emit-page (out-stream :title "New conversation" :content-class "conversation-page")
1404                      (render-template* *conversation-template* out-stream
1405                                        :to to
1406                                        :csrf-token (make-csrf-token)))))))
1407     (:post ((text :required t))
1408      (let* ((subject (post-or-get-parameter "subject"))
1409             (to (post-or-get-parameter "to"))
1410             (id (or id
1411                     (let ((participant-ids (list (logged-in-userid) (cdar (lw2-graphql-query (lw2-query-string :user :single (alist :slug to) '(:--id)))))))
1412                       (do-create-conversation (hunchentoot:cookie-in "lw2-auth-token") (alist :participant-ids participant-ids :title subject))))))
1413        (do-create-message (hunchentoot:cookie-in "lw2-auth-token") id text)
1414        (redirect (format nil "/conversation?id=~A" id))))))
1415
1416 (defun search-result-markdown-to-html (item)
1417   (cons (cons :html-body
1418               (handler-case (markdown:parse (cdr (assoc :body item)))
1419                 (serious-condition () "[Error while processing search result]")))
1420         item))
1421
1422 (define-page view-search "/search" ((q :required t))
1423   (let ((*current-search-query* q)
1424         (link (convert-any-link* q)))
1425     (declare (special *current-search-query*))
1426     (if link
1427         (redirect link)
1428         (multiple-value-bind (posts comments) (lw2-search-query q)
1429           (view-items-index (nconc (map 'list (lambda (p) (if (cdr (assoc :comment-count p)) p (cons (cons :comment-count 0) p))) posts)
1430                                    (map 'list #'search-result-markdown-to-html comments))
1431                             :content-class "search-results-page" :current-uri "/search"
1432                             :title (format nil "~@[~A - ~]Search" q))))))
1433
1434 (define-page view-login "/login" (return cookie-check
1435                                          (csrf-token :request-type :post) (login-username :request-type :post) (login-password :request-type :post)
1436                                          (signup-username :request-type :post) (signup-email :request-type :post) (signup-password :request-type :post) (signup-password2 :request-type :post))
1437   (labels
1438     ((emit-login-page (&key error-message)
1439        (let ((csrf-token (make-csrf-token)))
1440          (emit-page (out-stream :title "Log in" :current-uri "/login" :content-class "login-page" :robots "noindex, nofollow")
1441                     (when error-message
1442                       (format out-stream "<div class=\"error-box\">~A</div>" error-message))
1443                     (with-outputs (out-stream) "<div class=\"login-container\">")
1444                     (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "login-form" "Log in" csrf-token
1445                                  '(("login-username" "Username" "text" "username")
1446                                    ("login-password" "Password" "password" "current-password"))
1447                                  "Log in"
1448                                  :end-html "<a href=\"/reset-password\">Forgot password</a>")
1449                     (output-form out-stream "post" (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))) "signup-form" "Create account" csrf-token
1450                                  '(("signup-username" "Username" "text" "username")
1451                                    ("signup-email" "Email" "text" "email")
1452                                    ("signup-password" "Password" "password" "new-password")
1453                                    ("signup-password2" "Confirm password" "password" "new-password"))
1454                                  "Create account")
1455                     (alexandria:if-let (main-site-title (main-site-title *current-site*))
1456                       (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>"
1457                               main-site-title))
1458                     (format out-stream "</div>"))))
1459      (finish-login (username user-id auth-token error-message &optional expires)
1460        (cond
1461          (auth-token
1462            (set-cookie "lw2-auth-token" auth-token :max-age (and expires (+ (- expires (get-unix-time)) (* 24 60 60))))
1463            (if expires (set-cookie "lw2-status" (json:encode-json-to-string (alist :expires expires))))
1464            (cache-put "auth-token-to-userid" auth-token user-id)
1465            (cache-put "auth-token-to-username" auth-token username)
1466            (redirect (if (and return (ppcre:scan "^/[^/]" return)) return "/")))
1467          (t
1468           (emit-login-page :error-message error-message)))))
1469     (cond
1470       ((not (or cookie-check (hunchentoot:cookie-in "session-token")))
1471         (set-cookie "session-token" (base64:usb8-array-to-base64-string (ironclad:make-random-salt)))
1472         (redirect (format nil "/login?~@[return=~A&~]cookie-check=y" (if return (url-rewrite:url-encode return)))))
1473       (cookie-check
1474         (if (hunchentoot:cookie-in "session-token")
1475             (redirect (format nil "/login~@[?return=~A~]" (if return (url-rewrite:url-encode return))))
1476             (emit-page (out-stream :title "Log in" :current-uri "/login")
1477                        (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))))))
1478       (login-username
1479         (check-csrf-token csrf-token)
1480         (cond
1481           ((or (string= login-username "") (string= login-password "")) (emit-login-page :error-message "Please enter a username and password"))
1482           (t (multiple-value-call #'finish-login login-username (do-login "username" login-username login-password)))))
1483       (signup-username
1484         (check-csrf-token csrf-token)
1485         (cond
1486           ((not (every (lambda (x) (not (string= x ""))) (list signup-username signup-email signup-password signup-password2)))
1487            (emit-login-page :error-message "Please fill in all fields"))
1488           ((not (string= signup-password signup-password2))
1489            (emit-login-page :error-message "Passwords do not match"))
1490           (t (multiple-value-call #'finish-login signup-username (do-lw2-create-user signup-username signup-email signup-password)))))
1491       (t
1492        (emit-login-page)))))
1493
1494 (define-page view-logout "/logout" ((logout :request-type :post))
1495   (check-csrf-token logout)
1496   (set-cookie "lw2-auth-token" "" :max-age 0)
1497   (redirect "/"))
1498
1499 (defparameter *reset-password-template* (compile-template* "reset-password.html"))
1500
1501 (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))
1502   (labels ((emit-rpw-page (&key message message-type step)
1503              (let ((csrf-token (make-csrf-token)))
1504                (emit-page (out-stream :title "Reset password" :content-class "reset-password" :robots "noindex, nofollow")
1505                           (render-template* *reset-password-template* out-stream
1506                                             :csrf-token csrf-token
1507                                             :reset-link reset-link
1508                                             :message message
1509                                             :message-type message-type
1510                                             :step step)))))
1511     (cond
1512       (email
1513         (check-csrf-token csrf-token)
1514         (multiple-value-bind (ret error)
1515           (do-lw2-forgot-password email)
1516           (declare (ignore ret))
1517           (if error
1518               (emit-rpw-page :step 1 :message error :message-type "error")
1519               (emit-rpw-page :step 1 :message "Password reset email sent." :message-type "success"))))
1520       (reset-link
1521         (ppcre:register-groups-bind (reset-token) ("(?:reset-password/|^)([^/#]+)$" reset-link)
1522                                     (cond
1523                                       ((not reset-token)
1524                                        (emit-rpw-page :step 2 :message "Invalid password reset link." :message-type "error"))
1525                                       ((not (string= password password2))
1526                                        (emit-rpw-page :step 2 :message "Passwords do not match." :message-type "error"))
1527                                       (t
1528                                        (check-csrf-token csrf-token)
1529                                        (multiple-value-bind (user-id auth-token error-message) (do-lw2-reset-password reset-token password)
1530                                          (declare (ignore user-id auth-token))
1531                                          (cond
1532                                            (error-message (emit-rpw-page :step 2 :message error-message :message-type "error"))
1533                                            (t
1534                                             (with-error-page (emit-page (out-stream :title "Reset password" :content-class "reset-password")
1535                                                                         (format out-stream "<h1>Password reset complete</h1><p>You can now <a href=\"/login\">log in</a> with your new password.</p>"))))))))))
1536       (t
1537        (emit-rpw-page)))))
1538
1539 (defun firstn (list n)
1540   (loop for x in list
1541         for i from 1 to n
1542         collect x))
1543
1544 (defparameter *earliest-post* (local-time:parse-timestring "2005-01-01"))
1545
1546 (define-page view-archive (:regex "^/archive(?:/(\\d{4})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))(?:/(\\d{1,2})|/?(?:$|\\?.*$))"
1547                            (year :type (mod 10000))
1548                            (month :type (integer 1 12))
1549                            (day :type (integer 1 31)))
1550              ((offset :type fixnum :default 0))
1551   (local-time:with-decoded-timestamp (:day current-day :month current-month :year current-year) (local-time:now)
1552     (local-time:with-decoded-timestamp (:day earliest-day :month earliest-month :year earliest-year) *earliest-post*
1553       (labels ((url-elements (&rest url-elements)
1554                  (declare (dynamic-extent url-elements))
1555                  (format nil "/~{~A~^/~}" url-elements))
1556                (archive-nav (out-stream)
1557                  (with-outputs (out-stream) "<div class=\"archive-nav\"><div class=\"archive-nav-years\">")
1558                  (link-if-not out-stream (not (or year month day)) (url-elements "archive") "archive-nav-item-year" "All")
1559                  (loop for y from earliest-year to current-year
1560                        do (link-if-not out-stream (eq y year) (url-elements "archive" y) "archive-nav-item-year" y))
1561                  (format out-stream "</div>")
1562                  (when year
1563                    (format out-stream "<div class=\"archive-nav-months\">")
1564                    (link-if-not out-stream (not month) (url-elements "archive" year) "archive-nav-item-month" "All")
1565                    (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)
1566                          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)))
1567                    (format out-stream "</div>"))
1568                  (when month
1569                    (format out-stream "<div class=\"archive-nav-days\">")
1570                    (link-if-not out-stream (not day) (url-elements "archive" year month) "archive-nav-item-day" "All")
1571                    (loop for d from (if (and (= (or year current-year) earliest-year) (= (or month current-month) earliest-month)) earliest-day 1)
1572                          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)))
1573                          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))
1574                    (format out-stream "</div>"))
1575                  (format out-stream "</div>")))
1576         (multiple-value-bind (posts total)
1577           (lw2-graphql-query (lw2-query-string :post :list
1578                                                (alist :view (if day "new" "top") :limit 51 :offset offset
1579                                                       :after (if (and year (not day)) (format nil "~A-~A-~A" (or year earliest-year) (or month 1) (or day 1)))
1580                                                       :before (if year (format nil "~A-~A-~A" (or year current-year) (or month 12)
1581                                                                                (or day (local-time:days-in-month (or month 12) (or year current-year))))))
1582                                                (posts-index-fields)))
1583           (emit-page (out-stream :title "Archive" :current-uri "/archive" :content-class "archive-page"
1584                                  :top-nav #'archive-nav
1585                                  :pagination (pagination-nav-bars :items-per-page 50 :offset offset :total total :with-next (if total nil (> (length posts) 50))))
1586                      (write-index-items-to-html out-stream (firstn posts 50) :empty-message "No posts for the selected period.")))))))
1587
1588 (define-page view-about "/about" ()
1589   (emit-page (out-stream :title "About" :current-uri "/about" :content-class "about-page")
1590              (alexandria:with-input-from-file (in-stream "www/about.html" :element-type '(unsigned-byte 8))
1591                                               (alexandria:copy-stream in-stream out-stream))))
1592
1593 (hunchentoot:define-easy-handler (view-versioned-resource :uri (lambda (r)
1594                                                                  (multiple-value-bind (file content-type)
1595                                                                    #.(labels ((defres (uri content-type)
1596                                                                                 `(,uri (values (concatenate 'string "www" ,uri) ,content-type))))
1597                                                                        (concatenate 'list
1598                                                                                     '(alexandria:switch ((hunchentoot:script-name r) :test #'string=))
1599                                                                                     (loop for system in '("mac" "windows" "linux") nconc
1600                                                                                       (loop for theme in '(nil "dark" "grey" "ultramodern" "zero" "brutalist" "rts")
1601                                                                                             collect (defres (format nil "/css/style~@[-~A~].~A.css" theme system) "text/css")))
1602                                                                                     (loop for (uri content-type) in
1603                                                                                       '(("/script.js" "text/javascript")
1604                                                                                         ("/assets/favicon.ico" "image/x-icon"))
1605                                                                                       collect (defres uri content-type))))
1606                                                                    (when file
1607                                                                      (when (assoc "v" (hunchentoot:get-parameters r) :test #'string=)
1608                                                                        (setf (hunchentoot:header-out "Cache-Control") (format nil "public, max-age=~A, immutable" (- (expt 2 31) 1))))
1609                                                                      (hunchentoot:handle-static-file file content-type)
1610                                                                      t))))
1611                                  nil)