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