webcit-ng/room_functions.c

   1 /*
   2  * Room functions
   3  *
   4  * Copyright (c) 1996-2018 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "webcit.h"
  16
  17
  18 /*
  19  * Return a "zero-terminated" array of message numbers in the current room.
  20  * Caller owns the memory and must free it.  Returns NULL if any problems.
  21  */
  22 long *get_msglist(struct ctdlsession *c, char *which_msgs)
  23 {
  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 {
  57         int num_tags = num_tokens(taglist, ',');
  58         int i = 0;
  59         char tag[1024];
  60
  61         if (msgnum <= 0) {                                      // no msgnum?  no match.
  62                 return (0);
  63         }
  64
  65         for (i = 0; i < num_tags; ++i) {
  66                 extract_token(tag, taglist, i, ',', sizeof tag);
  67                 striplt(tag);
  68                 char *lq = (strchr(tag, '"'));
  69                 char *rq = (strrchr(tag, '"'));
  70                 if (lq < rq) {                                  // has two double quotes
  71                         strcpy(rq, "");
  72                         strcpy(tag, ++lq);
  73                 }
  74                 striplt(tag);
  75                 if (!strcmp(tag, "*")) {                        // wildcard match
  76                         return (1);
  77                 }
  78                 long tagmsgnum = atol(tag);
  79                 if ((tagmsgnum > 0) && (tagmsgnum == msgnum)) { // match
  80                         return (1);
  81                 }
  82         }
  83
  84         return (0);                                             // no match
  85 }
  86
  87
  88 /*
  89  * Client is requesting a message list
  90  */
  91 void json_msglist(struct http_transaction *h, struct ctdlsession *c, char *which)
  92 {
  93         int i = 0;
  94         long *msglist = get_msglist(c, which);
  95         JsonValue *j = NewJsonArray(HKEY("msgs"));
  96
  97         if (msglist != NULL) {
  98                 for (i = 0; msglist[i] > 0; ++i) {
  99                         JsonArrayAppend(j, NewJsonNumber(HKEY("m"), msglist[i]));
 100                 }
 101                 free(msglist);
 102         }
 103
 104         StrBuf *sj = NewStrBuf();
 105         SerializeJson(sj, j, 1);        // '1' == free the source array
 106
 107         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 108         h->response_code = 200;
 109         h->response_string = strdup("OK");
 110         h->response_body_length = StrLength(sj);
 111         h->response_body = SmashStrBuf(&sj);
 112         return;
 113 }
 114
 115
 116 /*
 117  * Client requested an object in a room.
 118  */
 119 void object_in_room(struct http_transaction *h, struct ctdlsession *c)
 120 {
 121         char buf[1024];
 122         long msgnum = (-1);
 123         char unescaped_euid[1024];
 124
 125         extract_token(buf, h->uri, 4, '/', sizeof buf);
 126
 127         if (!strncasecmp(buf, "msgs.", 5))      // Client is requesting a list of message numbers
 128         {
 129                 json_msglist(h, c, &buf[5]);
 130                 return;
 131         }
 132 #if 0
 133         if (!strncasecmp(buf, "threads", 5))    // Client is requesting a threaded view (still kind of fuzzy here)
 134         {
 135                 threaded_view(h, c, &buf[5]);
 136                 return;
 137         }
 138
 139         if (!strncasecmp(buf, "flat", 5))       // Client is requesting a flat view (still kind of fuzzy here)
 140         {
 141                 flat_view(h, c, &buf[5]);
 142                 return;
 143         }
 144 #endif
 145
 146         if ((c->room_default_view == VIEW_CALENDAR)     // room types where objects are referenced by EUID
 147             || (c->room_default_view == VIEW_TASKS)
 148             || (c->room_default_view == VIEW_ADDRESSBOOK)
 149             ) {
 150                 safestrncpy(unescaped_euid, buf, sizeof unescaped_euid);
 151                 unescape_input(unescaped_euid);
 152                 msgnum = locate_message_by_uid(c, unescaped_euid);
 153         } else {
 154                 msgnum = atol(buf);
 155         }
 156
 157         /*
 158          * All methods except PUT require the message to already exist
 159          */
 160         if ((msgnum <= 0) && (strcasecmp(h->method, "PUT"))) {
 161                 do_404(h);
 162         }
 163
 164         /*
 165          * If we get to this point we have a valid message number in an accessible room.
 166          */
 167         syslog(LOG_DEBUG, "msgnum is %ld, method is %s", msgnum, h->method);
 168
 169         /*
 170          * A sixth component in the URL can be one of two things:
 171          * (1) a MIME part specifier, in which case the client wants to download that component within the message
 172          * (2) a content-type, in which ase the client wants us to try to render it a certain way
 173          */
 174         if (num_tokens(h->uri, '/') == 6) {
 175                 extract_token(buf, h->uri, 5, '/', sizeof buf);
 176                 if (!IsEmptyStr(buf)) {
 177                         if (!strcasecmp(buf, "json")) {
 178                                 json_render_one_message(h, c, msgnum);
 179                         } else {
 180                                 download_mime_component(h, c, msgnum, buf);
 181                         }
 182                         return;
 183                 }
 184         }
 185
 186         /*
 187          * Ok, we want a full message, but first let's check for the if[-none]-match headers.
 188          */
 189         char *if_match = header_val(h, "If-Match");
 190         if ((if_match != NULL) && (!match_etags(if_match, msgnum))) {
 191                 do_412(h);
 192                 return;
 193         }
 194
 195         char *if_none_match = header_val(h, "If-None-Match");
 196         if ((if_none_match != NULL) && (match_etags(if_none_match, msgnum))) {
 197                 do_412(h);
 198                 return;
 199         }
 200
 201         /*
 202          * DOOOOOO ITTTTT!!!
 203          */
 204
 205         if (!strcasecmp(h->method, "DELETE")) {
 206                 dav_delete_message(h, c, msgnum);
 207         } else if (!strcasecmp(h->method, "GET")) {
 208                 dav_get_message(h, c, msgnum);
 209         } else if (!strcasecmp(h->method, "PUT")) {
 210                 dav_put_message(h, c, unescaped_euid, msgnum);
 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 {
 223         if (c->room_default_view == VIEW_CALENDAR) {
 224                 caldav_report(h, c);    // CalDAV REPORTs ... fmgwac
 225                 return;
 226         }
 227
 228         do_404(h);              // future implementations like CardDAV will require code paths here
 229 }
 230
 231
 232 /*
 233  * Called by the_room_itself() when the HTTP method is OPTIONS
 234  */
 235 void options_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 236 {
 237         h->response_code = 200;
 238         h->response_string = strdup("OK");
 239         if (c->room_default_view == VIEW_CALENDAR) {
 240                 add_response_header(h, strdup("DAV"), strdup("1, calendar-access"));    // offer CalDAV
 241         } else if (c->room_default_view == VIEW_ADDRESSBOOK) {
 242                 add_response_header(h, strdup("DAV"), strdup("1, addressbook"));        // offer CardDAV
 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 {
 255         char *e;
 256         long timestamp;
 257         int dav_depth = (header_val(h, "Depth") ? atoi(header_val(h, "Depth")) : INT_MAX);
 258         syslog(LOG_DEBUG, "Client PROPFIND requested depth: %d", dav_depth);
 259         StrBuf *Buf = NewStrBuf();
 260
 261         StrBufAppendPrintf(Buf, "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 262                            "<D:multistatus " "xmlns:D=\"DAV:\" " "xmlns:C=\"urn:ietf:params:xml:ns:caldav\"" ">");
 263
 264         /* Transmit the collection resource */
 265         StrBufAppendPrintf(Buf, "<D:response>");
 266         StrBufAppendPrintf(Buf, "<D:href>");
 267         StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 268         StrBufAppendPrintf(Buf, "/ctdl/r/");
 269         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 270         StrBufAppendPrintf(Buf, "</D:href>");
 271
 272         StrBufAppendPrintf(Buf, "<D:propstat>");
 273         StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 274         StrBufAppendPrintf(Buf, "<D:prop>");
 275         StrBufAppendPrintf(Buf, "<D:displayname>");
 276         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 277         StrBufAppendPrintf(Buf, "</D:displayname>");
 278
 279         StrBufAppendPrintf(Buf, "<D:owner />"); // empty owner ought to be legal; see rfc3744 section 5.1
 280
 281         StrBufAppendPrintf(Buf, "<D:resourcetype><D:collection />");
 282         switch (c->room_default_view) {
 283         case VIEW_CALENDAR:
 284                 StrBufAppendPrintf(Buf, "<C:calendar />");      // RFC4791 section 4.2
 285                 break;
 286         }
 287         StrBufAppendPrintf(Buf, "</D:resourcetype>");
 288
 289         int enumerate_by_euid = 0;      // nonzero if messages will be retrieved by euid instead of msgnum
 290         switch (c->room_default_view) {
 291         case VIEW_CALENDAR:     // RFC4791 section 5.2
 292                 StrBufAppendPrintf(Buf,
 293                                    "<C:supported-calendar-component-set><C:comp name=\"VEVENT\"/></C:supported-calendar-component-set>");
 294                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 295                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 296                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 297                 enumerate_by_euid = 1;
 298                 break;
 299         case VIEW_TASKS:        // RFC4791 section 5.2
 300                 StrBufAppendPrintf(Buf,
 301                                    "<C:supported-calendar-component-set><C:comp name=\"VTODO\"/></C:supported-calendar-component-set>");
 302                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 303                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 304                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 305                 enumerate_by_euid = 1;
 306                 break;
 307         case VIEW_ADDRESSBOOK:  // FIXME put some sort of CardDAV crapola here when we implement it
 308                 enumerate_by_euid = 1;
 309                 break;
 310         case VIEW_WIKI: // FIXME invent "WikiDAV" ?
 311                 enumerate_by_euid = 1;
 312                 break;
 313         }
 314
 315
 316         /* FIXME get the mtime
 317            StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 318            escputs(datestring);
 319            StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 320          */
 321
 322         StrBufAppendPrintf(Buf, "</D:prop>");
 323         StrBufAppendPrintf(Buf, "</D:propstat>");
 324         StrBufAppendPrintf(Buf, "</D:response>\n");
 325
 326         // If a depth greater than zero was specified, transmit the collection listing
 327         // BEGIN COLLECTION
 328         if (dav_depth > 0) {
 329                 long *msglist = get_msglist(c, "ALL");
 330                 if (msglist) {
 331                         int i;
 332                         for (i = 0; (msglist[i] > 0); ++i) {
 333                                 if ((i % 10) == 0)
 334                                         syslog(LOG_DEBUG, "PROPFIND enumerated %d messages", i);
 335                                 e = NULL;       // EUID gets stored here
 336                                 timestamp = 0;
 337
 338                                 char cbuf[1024];
 339                                 ctdl_printf(c, "MSG0 %ld|3", msglist[i]);
 340                                 ctdl_readline(c, cbuf, sizeof(cbuf));
 341                                 if (cbuf[0] == '1')
 342                                         while (ctdl_readline(c, cbuf, sizeof(cbuf)), strcmp(cbuf, "000")) {
 343                                                 if ((enumerate_by_euid) && (!strncasecmp(cbuf, "exti=", 5))) {
 344                                                         // e = strdup(&cbuf[5]);
 345                                                         int elen = (2 * strlen(&cbuf[5]));
 346                                                         e = malloc(elen);
 347                                                         urlesc(e, elen, &cbuf[5]);
 348                                                 }
 349                                                 if (!strncasecmp(cbuf, "time=", 5)) {
 350                                                         timestamp = atol(&cbuf[5]);
 351                                                 }
 352                                         }
 353                                 if (e == NULL) {
 354                                         e = malloc(20);
 355                                         sprintf(e, "%ld", msglist[i]);
 356                                 }
 357                                 StrBufAppendPrintf(Buf, "<D:response>");
 358
 359                                 // Generate the 'href' tag for this message
 360                                 StrBufAppendPrintf(Buf, "<D:href>");
 361                                 StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 362                                 StrBufAppendPrintf(Buf, "/ctdl/r/");
 363                                 StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 364                                 StrBufAppendPrintf(Buf, "/");
 365                                 StrBufXMLEscAppend(Buf, NULL, e, strlen(e), 0);
 366                                 StrBufAppendPrintf(Buf, "</D:href>");
 367                                 StrBufAppendPrintf(Buf, "<D:propstat>");
 368                                 StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 369                                 StrBufAppendPrintf(Buf, "<D:prop>");
 370
 371                                 switch (c->room_default_view) {
 372                                 case VIEW_CALENDAR:
 373                                         StrBufAppendPrintf(Buf,
 374                                                            "<D:getcontenttype>text/calendar; component=vevent</D:getcontenttype>");
 375                                         break;
 376                                 case VIEW_TASKS:
 377                                         StrBufAppendPrintf(Buf,
 378                                                            "<D:getcontenttype>text/calendar; component=vtodo</D:getcontenttype>");
 379                                         break;
 380                                 case VIEW_ADDRESSBOOK:
 381                                         StrBufAppendPrintf(Buf, "<D:getcontenttype>text/x-vcard</D:getcontenttype>");
 382                                         break;
 383                                 }
 384
 385                                 if (timestamp > 0) {
 386                                         char *datestring = http_datestring(timestamp);
 387                                         if (datestring) {
 388                                                 StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 389                                                 StrBufXMLEscAppend(Buf, NULL, datestring, strlen(datestring), 0);
 390                                                 StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 391                                                 free(datestring);
 392                                         }
 393                                         if (enumerate_by_euid)  // FIXME ajc 2017oct30 should this be inside the timestamp conditional?
 394                                         {
 395                                                 StrBufAppendPrintf(Buf, "<D:getetag>\"%ld\"</D:getetag>", msglist[i]);
 396                                         }
 397                                 }
 398                                 StrBufAppendPrintf(Buf, "</D:prop></D:propstat></D:response>\n");
 399                                 free(e);
 400                         }
 401                         free(msglist);
 402                 };
 403         }
 404         // END COLLECTION
 405
 406         StrBufAppendPrintf(Buf, "</D:multistatus>\n");
 407
 408         add_response_header(h, strdup("Content-type"), strdup("text/xml"));
 409         h->response_code = 207;
 410         h->response_string = strdup("Multi-Status");
 411         h->response_body_length = StrLength(Buf);
 412         h->response_body = SmashStrBuf(&Buf);
 413 }
 414
 415 // some good examples here
 416 // http://blogs.nologin.es/rickyepoderi/index.php?/archives/14-Introducing-CalDAV-Part-I.html
 417
 418
 419 /*
 420  * Called by the_room_itself() when the HTTP method is PROPFIND
 421  */
 422 void get_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 423 {
 424         JsonValue *j = NewJsonObject(HKEY("gotoroom"));
 425
 426         JsonObjectAppend(j, NewJsonPlainString(HKEY("name"), c->room, -1));
 427         JsonObjectAppend(j, NewJsonNumber(HKEY("current_view"), c->room_current_view));
 428         JsonObjectAppend(j, NewJsonNumber(HKEY("default_view"), c->room_default_view));
 429         JsonObjectAppend(j, NewJsonNumber(HKEY("new_messages"), c->new_messages));
 430         JsonObjectAppend(j, NewJsonNumber(HKEY("total_messages"), c->total_messages));
 431         JsonObjectAppend(j, NewJsonNumber(HKEY("last_seen"), c->last_seen));
 432
 433         StrBuf *sj = NewStrBuf();
 434         SerializeJson(sj, j, 1);        // '1' == free the source array
 435
 436         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 437         h->response_code = 200;
 438         h->response_string = strdup("OK");
 439         h->response_body_length = StrLength(sj);
 440         h->response_body = SmashStrBuf(&sj);
 441         return;
 442 }
 443
 444
 445 /*
 446  * Handle REST/DAV requests for the room itself (such as /ctdl/r/roomname
 447  * or /ctdl/r/roomname/ but *not* specific objects within the room)
 448  */
 449 void the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 450 {
 451         // OPTIONS method on the room itself usually is a DAV client assessing what's here.
 452
 453         if (!strcasecmp(h->method, "OPTIONS")) {
 454                 options_the_room_itself(h, c);
 455                 return;
 456         }
 457         // PROPFIND method on the room itself could be looking for a directory
 458
 459         if (!strcasecmp(h->method, "PROPFIND")) {
 460                 propfind_the_room_itself(h, c);
 461                 return;
 462         }
 463         // REPORT method on the room itself is probably the dreaded CalDAV tower-of-crapola
 464
 465         if (!strcasecmp(h->method, "REPORT")) {
 466                 report_the_room_itself(h, c);
 467                 return;
 468         }
 469         // GET method on the room itself is an API call, possibly from our JavaScript front end
 470
 471         if (!strcasecmp(h->method, "get")) {
 472                 get_the_room_itself(h, c);
 473                 return;
 474         }
 475         // we probably want a "go to this room" for interactive access
 476         do_404(h);
 477 }
 478
 479
 480 /*
 481  * Dispatcher for "/ctdl/r" and "/ctdl/r/" for the room list
 482  */
 483 void room_list(struct http_transaction *h, struct ctdlsession *c)
 484 {
 485         char buf[1024];
 486         char roomname[1024];
 487
 488         ctdl_printf(c, "LKRA");
 489         ctdl_readline(c, buf, sizeof(buf));
 490         if (buf[0] != '1') {
 491                 do_502(h);
 492                 return;
 493         }
 494
 495         JsonValue *j = NewJsonArray(HKEY("lkra"));
 496         while (ctdl_readline(c, buf, sizeof(buf)), strcmp(buf, "000")) {
 497
 498                 // name|QRflags|QRfloor|QRorder|QRflags2|ra|current_view|default_view|mtime
 499                 JsonValue *jr = NewJsonObject(HKEY("room"));
 500
 501                 extract_token(roomname, buf, 0, '|', sizeof roomname);
 502                 JsonObjectAppend(jr, NewJsonPlainString(HKEY("name"), roomname, -1));
 503
 504                 int ra = extract_int(buf, 5);
 505                 JsonObjectAppend(jr, NewJsonBool(HKEY("known"), (ra && UA_KNOWN)));
 506                 JsonObjectAppend(jr, NewJsonBool(HKEY("hasnewmsgs"), (ra && UA_HASNEWMSGS)));
 507
 508                 int floor = extract_int(buf, 2);
 509                 JsonObjectAppend(jr, NewJsonNumber(HKEY("floor"), floor));
 510
 511                 int rorder = extract_int(buf, 3);
 512                 JsonObjectAppend(jr, NewJsonNumber(HKEY("rorder"), rorder));
 513
 514                 JsonArrayAppend(j, jr); // add the room to the array
 515         }
 516
 517         StrBuf *sj = NewStrBuf();
 518         SerializeJson(sj, j, 1);        // '1' == free the source array
 519
 520         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 521         h->response_code = 200;
 522         h->response_string = strdup("OK");
 523         h->response_body_length = StrLength(sj);
 524         h->response_body = SmashStrBuf(&sj);
 525 }
 526
 527
 528 /*
 529  * Dispatcher for paths starting with /ctdl/r/
 530  */
 531 void ctdl_r(struct http_transaction *h, struct ctdlsession *c)
 532 {
 533         char requested_roomname[128];
 534         char buf[1024];
 535
 536         // All room-related functions require being "in" the room specified.  Are we in that room already?
 537         extract_token(requested_roomname, h->uri, 3, '/', sizeof requested_roomname);
 538         unescape_input(requested_roomname);
 539
 540         if (IsEmptyStr(requested_roomname))     //      /ctdl/r/
 541         {
 542                 room_list(h, c);
 543                 return;
 544         }
 545         // If not, try to go there.
 546         if (strcasecmp(requested_roomname, c->room)) {
 547                 ctdl_printf(c, "GOTO %s", requested_roomname);
 548                 ctdl_readline(c, buf, sizeof(buf));
 549                 if (buf[0] == '2') {
 550                         // buf[3] will indicate whether any instant messages are waiting
 551                         extract_token(c->room, &buf[4], 0, '|', sizeof c->room);
 552                         c->new_messages = extract_int(&buf[4], 1);
 553                         c->total_messages = extract_int(&buf[4], 2);
 554                         //      3       (int)info                       Info flag: set to nonzero if the user needs to read this room's info file
 555                         //      4       (int)CCC->room.QRflags          Various flags associated with this room.
 556                         //      5       (long)CCC->room.QRhighest       The highest message number present in this room
 557                         c->last_seen = extract_long(&buf[4], 6);        // The highest message number the user has read in this room
 558                         //      7       (int)rmailflag                  Boolean flag: 1 if this is a Mail> room, 0 otherwise.
 559                         //      8       (int)raideflag                  Nonzero if user is either Aide or a Room Aide in this room
 560                         //      9       (int)newmailcount               The number of new Mail messages the user has
 561                         //      10      (int)CCC->room.QRfloor          The floor number this room resides on
 562                         c->room_current_view = extract_int(&buf[4], 11);
 563                         c->room_default_view = extract_int(&buf[4], 12);
 564                         //      13      (int)is_trash                   Boolean flag: 1 if this is the user's Trash folder, 0 otherwise.
 565                         //      14      (int)CCC->room.QRflags2         More flags associated with this room
 566                         //      15      (long)CCC->room.QRmtime         Timestamp of the last write activity in this room
 567                 } else {
 568                         do_404(h);
 569                         return;
 570                 }
 571         }
 572         // At this point our Citadel client session is "in" the specified room.
 573
 574         if (num_tokens(h->uri, '/') == 4)       //      /ctdl/r/roomname
 575         {
 576                 the_room_itself(h, c);
 577                 return;
 578         }
 579
 580         extract_token(buf, h->uri, 4, '/', sizeof buf);
 581         if (num_tokens(h->uri, '/') == 5) {
 582                 if (IsEmptyStr(buf)) {
 583                         the_room_itself(h, c);  //      /ctdl/r/roomname/       ( same as /ctdl/r/roomname )
 584                 } else {
 585                         object_in_room(h, c);   //      /ctdl/r/roomname/object
 586                 }
 587                 return;
 588         }
 589         if (num_tokens(h->uri, '/') == 6) {
 590                 object_in_room(h, c);   //      /ctdl/r/roomname/object/ or possibly /ctdl/r/roomname/object/component
 591                 return;
 592         }
 593         // If we get to this point, the client specified a valid room but requested an action we don't know how to perform.
 594         do_404(h);
 595 }