webcit-ng/room_functions.c

   1 //
   2 // Room functions
   3 //
   4 // Copyright (c) 1996-2021 by the citadel.org team
   5 //
   6 // This program is open source software.  It runs great on the
   7 // Linux operating system (and probably elsewhere).  You can use,
   8 // copy, and run it under the terms of the GNU General Public
   9 // License version 3.  Richard Stallman is an asshole communist.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 #include "webcit.h"
  17
  18
  19 /*
  20  * Return a "zero-terminated" array of message numbers in the current room.
  21  * Caller owns the memory and must free it.  Returns NULL if any problems.
  22  */
  23 long *get_msglist(struct ctdlsession *c, char *which_msgs) {
  24         char buf[1024];
  25         long *msglist = NULL;
  26         int num_msgs = 0;
  27         int num_alloc = 0;
  28
  29         ctdl_printf(c, "MSGS %s", which_msgs);
  30         ctdl_readline(c, buf, sizeof(buf));
  31         if (buf[0] == '1') {
  32                 do {
  33                         if (num_msgs >= num_alloc) {
  34                                 if (num_alloc == 0) {
  35                                         num_alloc = 1024;
  36                                         msglist = malloc(num_alloc * sizeof(long));
  37                                 } else {
  38                                         num_alloc *= 2;
  39                                         msglist = realloc(msglist, num_alloc * sizeof(long));
  40                                 }
  41                         }
  42                         ctdl_readline(c, buf, sizeof(buf));
  43                         msglist[num_msgs++] = atol(buf);
  44                 } while (strcmp(buf, "000"));   // this makes the last element a "0" terminator
  45         }
  46         return msglist;
  47 }
  48
  49
  50 /*
  51  * Supplied with a list of potential matches from an If-Match: or If-None-Match: header, and
  52  * a message number (which we always use as the entity tag in Citadel), return nonzero if the
  53  * message number matches any of the supplied tags in the string.
  54  */
  55 int match_etags(char *taglist, long msgnum) {
  56         int num_tags = num_tokens(taglist, ',');
  57         int i = 0;
  58         char tag[1024];
  59
  60         if (msgnum <= 0) {                                      // no msgnum?  no match.
  61                 return (0);
  62         }
  63
  64         for (i = 0; i < num_tags; ++i) {
  65                 extract_token(tag, taglist, i, ',', sizeof tag);
  66                 striplt(tag);
  67                 char *lq = (strchr(tag, '"'));
  68                 char *rq = (strrchr(tag, '"'));
  69                 if (lq < rq) {                                  // has two double quotes
  70                         strcpy(rq, "");
  71                         strcpy(tag, ++lq);
  72                 }
  73                 striplt(tag);
  74                 if (!strcmp(tag, "*")) {                        // wildcard match
  75                         return (1);
  76                 }
  77                 long tagmsgnum = atol(tag);
  78                 if ((tagmsgnum > 0) && (tagmsgnum == msgnum)) { // match
  79                         return (1);
  80                 }
  81         }
  82
  83         return (0);                                             // no match
  84 }
  85
  86
  87 /*
  88  * Client is requesting a message list
  89  */
  90 void json_msglist(struct http_transaction *h, struct ctdlsession *c, char *which) {
  91         int i = 0;
  92         long *msglist = get_msglist(c, which);
  93         JsonValue *j = NewJsonArray(HKEY("msgs"));
  94
  95         if (msglist != NULL) {
  96                 for (i = 0; msglist[i] > 0; ++i) {
  97                         JsonArrayAppend(j, NewJsonNumber(HKEY("m"), msglist[i]));
  98                 }
  99                 free(msglist);
 100         }
 101
 102         StrBuf *sj = NewStrBuf();
 103         SerializeJson(sj, j, 1);        // '1' == free the source array
 104
 105         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 106         h->response_code = 200;
 107         h->response_string = strdup("OK");
 108         h->response_body_length = StrLength(sj);
 109         h->response_body = SmashStrBuf(&sj);
 110         return;
 111 }
 112
 113
 114 /*
 115  * Client requested an object in a room.
 116  */
 117 void object_in_room(struct http_transaction *h, struct ctdlsession *c) {
 118         char buf[1024];
 119         long msgnum = (-1);
 120         char unescaped_euid[1024];
 121
 122         extract_token(buf, h->uri, 4, '/', sizeof buf);
 123
 124         if (!strncasecmp(buf, "msgs.", 5))      // Client is requesting a list of message numbers
 125         {
 126                 json_msglist(h, c, &buf[5]);
 127                 return;
 128         }
 129 #if 0
 130         if (!strncasecmp(buf, "threads", 5))    // Client is requesting a threaded view (still kind of fuzzy here)
 131         {
 132                 threaded_view(h, c, &buf[5]);
 133                 return;
 134         }
 135
 136         if (!strncasecmp(buf, "flat", 5))       // Client is requesting a flat view (still kind of fuzzy here)
 137         {
 138                 flat_view(h, c, &buf[5]);
 139                 return;
 140         }
 141 #endif
 142
 143         if ((c->room_default_view == VIEW_CALENDAR)     // room types where objects are referenced by EUID
 144             || (c->room_default_view == VIEW_TASKS)
 145             || (c->room_default_view == VIEW_ADDRESSBOOK)
 146             ) {
 147                 safestrncpy(unescaped_euid, buf, sizeof unescaped_euid);
 148                 unescape_input(unescaped_euid);
 149                 msgnum = locate_message_by_uid(c, unescaped_euid);
 150         } else {
 151                 msgnum = atol(buf);
 152         }
 153
 154         /*
 155          * All methods except PUT require the message to already exist
 156          */
 157         if ((msgnum <= 0) && (strcasecmp(h->method, "PUT"))) {
 158                 do_404(h);
 159         }
 160
 161         /*
 162          * If we get to this point we have a valid message number in an accessible room.
 163          */
 164         syslog(LOG_DEBUG, "msgnum is %ld, method is %s", msgnum, h->method);
 165
 166         /*
 167          * A sixth component in the URL can be one of two things:
 168          * (1) a MIME part specifier, in which case the client wants to download that component within the message
 169          * (2) a content-type, in which ase the client wants us to try to render it a certain way
 170          */
 171         if (num_tokens(h->uri, '/') == 6) {
 172                 extract_token(buf, h->uri, 5, '/', sizeof buf);
 173                 if (!IsEmptyStr(buf)) {
 174                         if (!strcasecmp(buf, "json")) {
 175                                 json_render_one_message(h, c, msgnum);
 176                         } else {
 177                                 download_mime_component(h, c, msgnum, buf);
 178                         }
 179                         return;
 180                 }
 181         }
 182
 183         /*
 184          * Ok, we want a full message, but first let's check for the if[-none]-match headers.
 185          */
 186         char *if_match = header_val(h, "If-Match");
 187         if ((if_match != NULL) && (!match_etags(if_match, msgnum))) {
 188                 do_412(h);
 189                 return;
 190         }
 191
 192         char *if_none_match = header_val(h, "If-None-Match");
 193         if ((if_none_match != NULL) && (match_etags(if_none_match, msgnum))) {
 194                 do_412(h);
 195                 return;
 196         }
 197
 198         /*
 199          * DOOOOOO ITTTTT!!!
 200          */
 201
 202         if (!strcasecmp(h->method, "DELETE")) {
 203                 dav_delete_message(h, c, msgnum);
 204         }
 205         else if (!strcasecmp(h->method, "GET")) {
 206                 dav_get_message(h, c, msgnum);
 207         }
 208         else if (!strcasecmp(h->method, "PUT")) {
 209                 dav_put_message(h, c, unescaped_euid, msgnum);
 210         }
 211         else {
 212                 do_404(h);      // Got this far but the method made no sense?  Bummer.
 213         }
 214
 215 }
 216
 217
 218 /*
 219  * Called by the_room_itself() when the HTTP method is REPORT
 220  */
 221 void report_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 222         if (c->room_default_view == VIEW_CALENDAR) {
 223                 caldav_report(h, c);    // CalDAV REPORTs ... fmgwac
 224                 return;
 225         }
 226
 227         do_404(h);              // future implementations like CardDAV will require code paths here
 228 }
 229
 230
 231 /*
 232  * Called by the_room_itself() when the HTTP method is OPTIONS
 233  */
 234 void options_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 235         h->response_code = 200;
 236         h->response_string = strdup("OK");
 237         if (c->room_default_view == VIEW_CALENDAR) {
 238                 add_response_header(h, strdup("DAV"), strdup("1, calendar-access"));    // offer CalDAV
 239         }
 240         else if (c->room_default_view == VIEW_ADDRESSBOOK) {
 241                 add_response_header(h, strdup("DAV"), strdup("1, addressbook"));        // offer CardDAV
 242         }
 243         else {
 244                 add_response_header(h, strdup("DAV"), strdup("1"));     // ordinary WebDAV for all other room types
 245         }
 246         add_response_header(h, strdup("Allow"), strdup("OPTIONS, PROPFIND, GET, PUT, REPORT, DELETE"));
 247 }
 248
 249
 250 /*
 251  * Called by the_room_itself() when the HTTP method is PROPFIND
 252  */
 253 void propfind_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 254         char *e;
 255         long timestamp;
 256         int dav_depth = (header_val(h, "Depth") ? atoi(header_val(h, "Depth")) : INT_MAX);
 257         syslog(LOG_DEBUG, "Client PROPFIND requested depth: %d", dav_depth);
 258         StrBuf *Buf = NewStrBuf();
 259
 260         StrBufAppendPrintf(Buf, "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 261                            "<D:multistatus " "xmlns:D=\"DAV:\" " "xmlns:C=\"urn:ietf:params:xml:ns:caldav\"" ">");
 262
 263         /* Transmit the collection resource */
 264         StrBufAppendPrintf(Buf, "<D:response>");
 265         StrBufAppendPrintf(Buf, "<D:href>");
 266         StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 267         StrBufAppendPrintf(Buf, "/ctdl/r/");
 268         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 269         StrBufAppendPrintf(Buf, "</D:href>");
 270
 271         StrBufAppendPrintf(Buf, "<D:propstat>");
 272         StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 273         StrBufAppendPrintf(Buf, "<D:prop>");
 274         StrBufAppendPrintf(Buf, "<D:displayname>");
 275         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 276         StrBufAppendPrintf(Buf, "</D:displayname>");
 277
 278         StrBufAppendPrintf(Buf, "<D:owner />"); // empty owner ought to be legal; see rfc3744 section 5.1
 279
 280         StrBufAppendPrintf(Buf, "<D:resourcetype><D:collection />");
 281         switch (c->room_default_view) {
 282         case VIEW_CALENDAR:
 283                 StrBufAppendPrintf(Buf, "<C:calendar />");      // RFC4791 section 4.2
 284                 break;
 285         }
 286         StrBufAppendPrintf(Buf, "</D:resourcetype>");
 287
 288         int enumerate_by_euid = 0;      // nonzero if messages will be retrieved by euid instead of msgnum
 289         switch (c->room_default_view) {
 290         case VIEW_CALENDAR:             // RFC4791 section 5.2
 291                 StrBufAppendPrintf(Buf, "<C:supported-calendar-component-set><C:comp name=\"VEVENT\"/></C:supported-calendar-component-set>");
 292                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 293                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 294                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 295                 enumerate_by_euid = 1;
 296                 break;
 297         case VIEW_TASKS:                // RFC4791 section 5.2
 298                 StrBufAppendPrintf(Buf, "<C:supported-calendar-component-set><C:comp name=\"VTODO\"/></C:supported-calendar-component-set>");
 299                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 300                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 301                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 302                 enumerate_by_euid = 1;
 303                 break;
 304         case VIEW_ADDRESSBOOK:          // FIXME put some sort of CardDAV crapola here when we implement it
 305                 enumerate_by_euid = 1;
 306                 break;
 307         case VIEW_WIKI:                 // FIXME invent "WikiDAV" ?
 308                 enumerate_by_euid = 1;
 309                 break;
 310         }
 311
 312         /* FIXME get the mtime
 313            StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 314            escputs(datestring);
 315            StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 316          */
 317
 318         StrBufAppendPrintf(Buf, "</D:prop>");
 319         StrBufAppendPrintf(Buf, "</D:propstat>");
 320         StrBufAppendPrintf(Buf, "</D:response>\n");
 321
 322         // If a depth greater than zero was specified, transmit the collection listing
 323         // BEGIN COLLECTION
 324         if (dav_depth > 0) {
 325                 long *msglist = get_msglist(c, "ALL");
 326                 if (msglist) {
 327                         int i;
 328                         for (i = 0; (msglist[i] > 0); ++i) {
 329                                 if ((i % 10) == 0)
 330                                         syslog(LOG_DEBUG, "PROPFIND enumerated %d messages", i);
 331                                 e = NULL;       // EUID gets stored here
 332                                 timestamp = 0;
 333
 334                                 char cbuf[1024];
 335                                 ctdl_printf(c, "MSG0 %ld|3", msglist[i]);
 336                                 ctdl_readline(c, cbuf, sizeof(cbuf));
 337                                 if (cbuf[0] == '1')
 338                                         while (ctdl_readline(c, cbuf, sizeof(cbuf)), strcmp(cbuf, "000")) {
 339                                                 if ((enumerate_by_euid) && (!strncasecmp(cbuf, "exti=", 5))) {
 340                                                         // e = strdup(&cbuf[5]);
 341                                                         int elen = (2 * strlen(&cbuf[5]));
 342                                                         e = malloc(elen);
 343                                                         urlesc(e, elen, &cbuf[5]);
 344                                                 }
 345                                                 if (!strncasecmp(cbuf, "time=", 5)) {
 346                                                         timestamp = atol(&cbuf[5]);
 347                                                 }
 348                                         }
 349                                 if (e == NULL) {
 350                                         e = malloc(20);
 351                                         sprintf(e, "%ld", msglist[i]);
 352                                 }
 353                                 StrBufAppendPrintf(Buf, "<D:response>");
 354
 355                                 // Generate the 'href' tag for this message
 356                                 StrBufAppendPrintf(Buf, "<D:href>");
 357                                 StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 358                                 StrBufAppendPrintf(Buf, "/ctdl/r/");
 359                                 StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 360                                 StrBufAppendPrintf(Buf, "/");
 361                                 StrBufXMLEscAppend(Buf, NULL, e, strlen(e), 0);
 362                                 StrBufAppendPrintf(Buf, "</D:href>");
 363                                 StrBufAppendPrintf(Buf, "<D:propstat>");
 364                                 StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 365                                 StrBufAppendPrintf(Buf, "<D:prop>");
 366
 367                                 switch (c->room_default_view) {
 368                                 case VIEW_CALENDAR:
 369                                         StrBufAppendPrintf(Buf,
 370                                                            "<D:getcontenttype>text/calendar; component=vevent</D:getcontenttype>");
 371                                         break;
 372                                 case VIEW_TASKS:
 373                                         StrBufAppendPrintf(Buf,
 374                                                            "<D:getcontenttype>text/calendar; component=vtodo</D:getcontenttype>");
 375                                         break;
 376                                 case VIEW_ADDRESSBOOK:
 377                                         StrBufAppendPrintf(Buf, "<D:getcontenttype>text/x-vcard</D:getcontenttype>");
 378                                         break;
 379                                 }
 380
 381                                 if (timestamp > 0) {
 382                                         char *datestring = http_datestring(timestamp);
 383                                         if (datestring) {
 384                                                 StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 385                                                 StrBufXMLEscAppend(Buf, NULL, datestring, strlen(datestring), 0);
 386                                                 StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 387                                                 free(datestring);
 388                                         }
 389                                         if (enumerate_by_euid)  // FIXME ajc 2017oct30 should this be inside the timestamp conditional?
 390                                         {
 391                                                 StrBufAppendPrintf(Buf, "<D:getetag>\"%ld\"</D:getetag>", msglist[i]);
 392                                         }
 393                                 }
 394                                 StrBufAppendPrintf(Buf, "</D:prop></D:propstat></D:response>\n");
 395                                 free(e);
 396                         }
 397                         free(msglist);
 398                 };
 399         }
 400         // END COLLECTION
 401
 402         StrBufAppendPrintf(Buf, "</D:multistatus>\n");
 403
 404         add_response_header(h, strdup("Content-type"), strdup("text/xml"));
 405         h->response_code = 207;
 406         h->response_string = strdup("Multi-Status");
 407         h->response_body_length = StrLength(Buf);
 408         h->response_body = SmashStrBuf(&Buf);
 409 }
 410
 411 // some good examples here
 412 // http://blogs.nologin.es/rickyepoderi/index.php?/archives/14-Introducing-CalDAV-Part-I.html
 413
 414
 415 /*
 416  * Called by the_room_itself() when the HTTP method is PROPFIND
 417  */
 418 void get_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 419 {
 420         JsonValue *j = NewJsonObject(HKEY("gotoroom"));
 421
 422         JsonObjectAppend(j, NewJsonPlainString(HKEY("name"), c->room, -1));
 423         JsonObjectAppend(j, NewJsonNumber(HKEY("current_view"), c->room_current_view));
 424         JsonObjectAppend(j, NewJsonNumber(HKEY("default_view"), c->room_default_view));
 425         JsonObjectAppend(j, NewJsonNumber(HKEY("new_messages"), c->new_messages));
 426         JsonObjectAppend(j, NewJsonNumber(HKEY("total_messages"), c->total_messages));
 427         JsonObjectAppend(j, NewJsonNumber(HKEY("last_seen"), c->last_seen));
 428
 429         StrBuf *sj = NewStrBuf();
 430         SerializeJson(sj, j, 1);        // '1' == free the source array
 431
 432         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 433         h->response_code = 200;
 434         h->response_string = strdup("OK");
 435         h->response_body_length = StrLength(sj);
 436         h->response_body = SmashStrBuf(&sj);
 437         return;
 438 }
 439
 440
 441 /*
 442  * Handle REST/DAV requests for the room itself (such as /ctdl/r/roomname
 443  * or /ctdl/r/roomname/ but *not* specific objects within the room)
 444  */
 445 void the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 446
 447         // OPTIONS method on the room itself usually is a DAV client assessing what's here.
 448         if (!strcasecmp(h->method, "OPTIONS")) {
 449                 options_the_room_itself(h, c);
 450                 return;
 451         }
 452
 453         // PROPFIND method on the room itself could be looking for a directory
 454         if (!strcasecmp(h->method, "PROPFIND")) {
 455                 propfind_the_room_itself(h, c);
 456                 return;
 457         }
 458
 459         // REPORT method on the room itself is probably the dreaded CalDAV tower-of-crapola
 460         if (!strcasecmp(h->method, "REPORT")) {
 461                 report_the_room_itself(h, c);
 462                 return;
 463         }
 464
 465         // GET method on the room itself is an API call, possibly from our JavaScript front end
 466         if (!strcasecmp(h->method, "get")) {
 467                 get_the_room_itself(h, c);
 468                 return;
 469         }
 470
 471         // we probably want a "go to this room" for interactive access
 472         do_404(h);
 473 }
 474
 475
 476 /*
 477  * Dispatcher for "/ctdl/r" and "/ctdl/r/" for the room list
 478  */
 479 void room_list(struct http_transaction *h, struct ctdlsession *c) {
 480         char buf[1024];
 481         char roomname[1024];
 482
 483         ctdl_printf(c, "LKRA");
 484         ctdl_readline(c, buf, sizeof(buf));
 485         if (buf[0] != '1') {
 486                 do_502(h);
 487                 return;
 488         }
 489
 490         JsonValue *j = NewJsonArray(HKEY("lkra"));
 491         while (ctdl_readline(c, buf, sizeof(buf)), strcmp(buf, "000")) {
 492
 493                 // name|QRflags|QRfloor|QRorder|QRflags2|ra|current_view|default_view|mtime
 494                 JsonValue *jr = NewJsonObject(HKEY("room"));
 495
 496                 extract_token(roomname, buf, 0, '|', sizeof roomname);
 497                 JsonObjectAppend(jr, NewJsonPlainString(HKEY("name"), roomname, -1));
 498
 499                 int ra = extract_int(buf, 5);
 500                 JsonObjectAppend(jr, NewJsonBool(HKEY("known"), (ra & UA_KNOWN)));
 501                 JsonObjectAppend(jr, NewJsonBool(HKEY("hasnewmsgs"), (ra & UA_HASNEWMSGS)));
 502
 503                 int floor = extract_int(buf, 2);
 504                 JsonObjectAppend(jr, NewJsonNumber(HKEY("floor"), floor));
 505
 506                 int rorder = extract_int(buf, 3);
 507                 JsonObjectAppend(jr, NewJsonNumber(HKEY("rorder"), rorder));
 508
 509                 JsonArrayAppend(j, jr); // add the room to the array
 510         }
 511
 512         StrBuf *sj = NewStrBuf();
 513         SerializeJson(sj, j, 1);        // '1' == free the source array
 514
 515         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 516         h->response_code = 200;
 517         h->response_string = strdup("OK");
 518         h->response_body_length = StrLength(sj);
 519         h->response_body = SmashStrBuf(&sj);
 520 }
 521
 522
 523 /*
 524  * Dispatcher for paths starting with /ctdl/r/
 525  */
 526 void ctdl_r(struct http_transaction *h, struct ctdlsession *c) {
 527         char requested_roomname[128];
 528         char buf[1024];
 529
 530         // All room-related functions require being "in" the room specified.  Are we in that room already?
 531         extract_token(requested_roomname, h->uri, 3, '/', sizeof requested_roomname);
 532         unescape_input(requested_roomname);
 533
 534         if (IsEmptyStr(requested_roomname))     //      /ctdl/r/
 535         {
 536                 room_list(h, c);
 537                 return;
 538         }
 539         // If not, try to go there.
 540         if (strcasecmp(requested_roomname, c->room)) {
 541                 ctdl_printf(c, "GOTO %s", requested_roomname);
 542                 ctdl_readline(c, buf, sizeof(buf));
 543                 if (buf[0] == '2') {
 544                         // buf[3] will indicate whether any instant messages are waiting
 545                         extract_token(c->room, &buf[4], 0, '|', sizeof c->room);
 546                         c->new_messages = extract_int(&buf[4], 1);
 547                         c->total_messages = extract_int(&buf[4], 2);
 548                         //      3       (int)info                       Info flag: set to nonzero if the user needs to read this room's info file
 549                         //      4       (int)CCC->room.QRflags          Various flags associated with this room.
 550                         //      5       (long)CCC->room.QRhighest       The highest message number present in this room
 551                         c->last_seen = extract_long(&buf[4], 6);        // The highest message number the user has read in this room
 552                         //      7       (int)rmailflag                  Boolean flag: 1 if this is a Mail> room, 0 otherwise.
 553                         //      8       (int)raideflag                  Nonzero if user is either Aide or a Room Aide in this room
 554                         //      9       (int)newmailcount               The number of new Mail messages the user has
 555                         //      10      (int)CCC->room.QRfloor          The floor number this room resides on
 556                         c->room_current_view = extract_int(&buf[4], 11);
 557                         c->room_default_view = extract_int(&buf[4], 12);
 558                         //      13      (int)is_trash                   Boolean flag: 1 if this is the user's Trash folder, 0 otherwise.
 559                         //      14      (int)CCC->room.QRflags2         More flags associated with this room
 560                         //      15      (long)CCC->room.QRmtime         Timestamp of the last write activity in this room
 561                 } else {
 562                         do_404(h);
 563                         return;
 564                 }
 565         }
 566         // At this point our Citadel client session is "in" the specified room.
 567
 568         if (num_tokens(h->uri, '/') == 4)       //      /ctdl/r/roomname
 569         {
 570                 the_room_itself(h, c);
 571                 return;
 572         }
 573
 574         extract_token(buf, h->uri, 4, '/', sizeof buf);
 575         if (num_tokens(h->uri, '/') == 5) {
 576                 if (IsEmptyStr(buf)) {
 577                         the_room_itself(h, c);  //      /ctdl/r/roomname/       ( same as /ctdl/r/roomname )
 578                 } else {
 579                         object_in_room(h, c);   //      /ctdl/r/roomname/object
 580                 }
 581                 return;
 582         }
 583         if (num_tokens(h->uri, '/') == 6) {
 584                 object_in_room(h, c);   //      /ctdl/r/roomname/object/ or possibly /ctdl/r/roomname/object/component
 585                 return;
 586         }
 587         // If we get to this point, the client specified a valid room but requested an action we don't know how to perform.
 588         do_404(h);
 589 }