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         return msglist;
  46 }
  47
  48
  49 /*
  50  * Supplied with a list of potential matches from an If-Match: or If-None-Match: header, and
  51  * a message number (which we always use as the entity tag in Citadel), return nonzero if the
  52  * message number matches any of the supplied tags in the string.
  53  */
  54 int match_etags(char *taglist, long msgnum)
  55 {
  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         {
  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                 {
  72                         strcpy(rq, "");
  73                         strcpy(tag, ++lq);
  74                 }
  75                 striplt(tag);
  76                 if (!strcmp(tag, "*"))  // wildcard match
  77                 {
  78                         return (1);
  79                 }
  80                 long tagmsgnum = atol(tag);
  81                 if ((tagmsgnum > 0) && (tagmsgnum == msgnum))   // match
  82                 {
  83                         return (1);
  84                 }
  85         }
  86
  87         return (0);             // no match
  88 }
  89
  90
  91 /*
  92  * Client is requesting a message list
  93  */
  94 void json_msglist(struct http_transaction *h, struct ctdlsession *c, char *which)
  95 {
  96         int i = 0;
  97         long *msglist = get_msglist(c, which);
  98         JsonValue *j = NewJsonArray(HKEY("msgs"));
  99
 100         if (msglist != NULL) {
 101                 for (i = 0; msglist[i] > 0; ++i) {
 102                         JsonArrayAppend(j, NewJsonNumber(HKEY("m"), msglist[i]));
 103                 }
 104                 free(msglist);
 105         }
 106
 107         StrBuf *sj = NewStrBuf();
 108         SerializeJson(sj, j, 1);        // '1' == free the source array
 109
 110         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 111         h->response_code = 200;
 112         h->response_string = strdup("OK");
 113         h->response_body_length = StrLength(sj);
 114         h->response_body = SmashStrBuf(&sj);
 115         return;
 116 }
 117
 118
 119 /*
 120  * Client requested an object in a room.
 121  */
 122 void object_in_room(struct http_transaction *h, struct ctdlsession *c)
 123 {
 124         char buf[1024];
 125         long msgnum = (-1);
 126         char unescaped_euid[1024];
 127
 128         extract_token(buf, h->uri, 4, '/', sizeof buf);
 129
 130         if (!strncasecmp(buf, "msgs.", 5))      // Client is requesting a list of message numbers
 131         {
 132                 json_msglist(h, c, &buf[5]);
 133                 return;
 134         }
 135 #if 0
 136         if (!strncasecmp(buf, "threads", 5))    // Client is requesting a threaded view (still kind of fuzzy here)
 137         {
 138                 threaded_view(h, c, &buf[5]);
 139                 return;
 140         }
 141
 142         if (!strncasecmp(buf, "flat", 5))       // Client is requesting a flat view (still kind of fuzzy here)
 143         {
 144                 flat_view(h, c, &buf[5]);
 145                 return;
 146         }
 147 #endif
 148
 149         if ((c->room_default_view == VIEW_CALENDAR)     // room types where objects are referenced by EUID
 150             || (c->room_default_view == VIEW_TASKS)
 151             || (c->room_default_view == VIEW_ADDRESSBOOK)
 152             ) {
 153                 safestrncpy(unescaped_euid, buf, sizeof unescaped_euid);
 154                 unescape_input(unescaped_euid);
 155                 msgnum = locate_message_by_uid(c, unescaped_euid);
 156         } else {
 157                 msgnum = atol(buf);
 158         }
 159
 160         /*
 161          * All methods except PUT require the message to already exist
 162          */
 163         if ((msgnum <= 0) && (strcasecmp(h->method, "PUT"))) {
 164                 do_404(h);
 165         }
 166
 167         /*
 168          * If we get to this point we have a valid message number in an accessible room.
 169          */
 170         syslog(LOG_DEBUG, "msgnum is %ld, method is %s", msgnum, h->method);
 171
 172         /*
 173          * A sixth component in the URL can be one of two things:
 174          * (1) a MIME part specifier, in which case the client wants to download that component within the message
 175          * (2) a content-type, in which ase the client wants us to try to render it a certain way
 176          */
 177         if (num_tokens(h->uri, '/') == 6) {
 178                 extract_token(buf, h->uri, 5, '/', sizeof buf);
 179                 if (!IsEmptyStr(buf)) {
 180                         if (!strcasecmp(buf, "json")) {
 181                                 json_render_one_message(h, c, msgnum);
 182                         } else {
 183                                 download_mime_component(h, c, msgnum, buf);
 184                         }
 185                         return;
 186                 }
 187         }
 188
 189         /*
 190          * Ok, we want a full message, but first let's check for the if[-none]-match headers.
 191          */
 192         char *if_match = header_val(h, "If-Match");
 193         if ((if_match != NULL) && (!match_etags(if_match, msgnum))) {
 194                 do_412(h);
 195                 return;
 196         }
 197
 198         char *if_none_match = header_val(h, "If-None-Match");
 199         if ((if_none_match != NULL) && (match_etags(if_none_match, msgnum))) {
 200                 do_412(h);
 201                 return;
 202         }
 203
 204         /*
 205          * DOOOOOO ITTTTT!!!
 206          */
 207
 208         if (!strcasecmp(h->method, "DELETE")) {
 209                 dav_delete_message(h, c, msgnum);
 210         } else if (!strcasecmp(h->method, "GET")) {
 211                 dav_get_message(h, c, msgnum);
 212         } else if (!strcasecmp(h->method, "PUT")) {
 213                 dav_put_message(h, c, unescaped_euid, msgnum);
 214         } else {
 215                 do_404(h);      // Got this far but the method made no sense?  Bummer.
 216         }
 217
 218 }
 219
 220
 221 /*
 222  * Called by the_room_itself() when the HTTP method is REPORT
 223  */
 224 void report_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 225 {
 226         if (c->room_default_view == VIEW_CALENDAR) {
 227                 caldav_report(h, c);    // CalDAV REPORTs ... fmgwac
 228                 return;
 229         }
 230
 231         do_404(h);              // future implementations like CardDAV will require code paths here
 232 }
 233
 234
 235 /*
 236  * Called by the_room_itself() when the HTTP method is OPTIONS
 237  */
 238 void options_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 239 {
 240         h->response_code = 200;
 241         h->response_string = strdup("OK");
 242         if (c->room_default_view == VIEW_CALENDAR) {
 243                 add_response_header(h, strdup("DAV"), strdup("1, calendar-access"));    // offer CalDAV
 244         } else if (c->room_default_view == VIEW_ADDRESSBOOK) {
 245                 add_response_header(h, strdup("DAV"), strdup("1, addressbook"));        // offer CardDAV
 246         } else {
 247                 add_response_header(h, strdup("DAV"), strdup("1"));     // ordinary WebDAV for all other room types
 248         }
 249         add_response_header(h, strdup("Allow"), strdup("OPTIONS, PROPFIND, GET, PUT, REPORT, DELETE"));
 250 }
 251
 252
 253 /*
 254  * Called by the_room_itself() when the HTTP method is PROPFIND
 255  */
 256 void propfind_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 257 {
 258         char *e;
 259         long timestamp;
 260         int dav_depth = (header_val(h, "Depth") ? atoi(header_val(h, "Depth")) : INT_MAX);
 261         syslog(LOG_DEBUG, "Client PROPFIND requested depth: %d", dav_depth);
 262         StrBuf *Buf = NewStrBuf();
 263
 264         StrBufAppendPrintf(Buf, "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 265                            "<D:multistatus " "xmlns:D=\"DAV:\" " "xmlns:C=\"urn:ietf:params:xml:ns:caldav\"" ">");
 266
 267         /* Transmit the collection resource */
 268         StrBufAppendPrintf(Buf, "<D:response>");
 269         StrBufAppendPrintf(Buf, "<D:href>");
 270         StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 271         StrBufAppendPrintf(Buf, "/ctdl/r/");
 272         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 273         StrBufAppendPrintf(Buf, "</D:href>");
 274
 275         StrBufAppendPrintf(Buf, "<D:propstat>");
 276         StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 277         StrBufAppendPrintf(Buf, "<D:prop>");
 278         StrBufAppendPrintf(Buf, "<D:displayname>");
 279         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 280         StrBufAppendPrintf(Buf, "</D:displayname>");
 281
 282         StrBufAppendPrintf(Buf, "<D:owner />"); // empty owner ought to be legal; see rfc3744 section 5.1
 283
 284         StrBufAppendPrintf(Buf, "<D:resourcetype><D:collection />");
 285         switch (c->room_default_view) {
 286         case VIEW_CALENDAR:
 287                 StrBufAppendPrintf(Buf, "<C:calendar />");      // RFC4791 section 4.2
 288                 break;
 289         }
 290         StrBufAppendPrintf(Buf, "</D:resourcetype>");
 291
 292         int enumerate_by_euid = 0;      // nonzero if messages will be retrieved by euid instead of msgnum
 293         switch (c->room_default_view) {
 294         case VIEW_CALENDAR:     // RFC4791 section 5.2
 295                 StrBufAppendPrintf(Buf,
 296                                    "<C:supported-calendar-component-set><C:comp name=\"VEVENT\"/></C:supported-calendar-component-set>");
 297                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 298                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 299                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 300                 enumerate_by_euid = 1;
 301                 break;
 302         case VIEW_TASKS:        // RFC4791 section 5.2
 303                 StrBufAppendPrintf(Buf,
 304                                    "<C:supported-calendar-component-set><C:comp name=\"VTODO\"/></C:supported-calendar-component-set>");
 305                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 306                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 307                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 308                 enumerate_by_euid = 1;
 309                 break;
 310         case VIEW_ADDRESSBOOK:  // FIXME put some sort of CardDAV crapola here when we implement it
 311                 enumerate_by_euid = 1;
 312                 break;
 313         case VIEW_WIKI: // FIXME invent "WikiDAV" ?
 314                 enumerate_by_euid = 1;
 315                 break;
 316         }
 317
 318
 319         /* FIXME get the mtime
 320            StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 321            escputs(datestring);
 322            StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 323          */
 324
 325         StrBufAppendPrintf(Buf, "</D:prop>");
 326         StrBufAppendPrintf(Buf, "</D:propstat>");
 327         StrBufAppendPrintf(Buf, "</D:response>\n");
 328
 329         // If a depth greater than zero was specified, transmit the collection listing
 330         // BEGIN COLLECTION
 331         if (dav_depth > 0) {
 332                 long *msglist = get_msglist(c, "ALL");
 333                 if (msglist) {
 334                         int i;
 335                         for (i = 0; (msglist[i] > 0); ++i) {
 336                                 if ((i % 10) == 0)
 337                                         syslog(LOG_DEBUG, "PROPFIND enumerated %d messages", i);
 338                                 e = NULL;       // EUID gets stored here
 339                                 timestamp = 0;
 340
 341                                 char cbuf[1024];
 342                                 ctdl_printf(c, "MSG0 %ld|3", msglist[i]);
 343                                 ctdl_readline(c, cbuf, sizeof(cbuf));
 344                                 if (cbuf[0] == '1')
 345                                         while (ctdl_readline(c, cbuf, sizeof(cbuf)), strcmp(cbuf, "000")) {
 346                                                 if ((enumerate_by_euid) && (!strncasecmp(cbuf, "exti=", 5))) {
 347                                                         // e = strdup(&cbuf[5]);
 348                                                         int elen = (2 * strlen(&cbuf[5]));
 349                                                         e = malloc(elen);
 350                                                         urlesc(e, elen, &cbuf[5]);
 351                                                 }
 352                                                 if (!strncasecmp(cbuf, "time=", 5)) {
 353                                                         timestamp = atol(&cbuf[5]);
 354                                                 }
 355                                         }
 356                                 if (e == NULL) {
 357                                         e = malloc(20);
 358                                         sprintf(e, "%ld", msglist[i]);
 359                                 }
 360                                 StrBufAppendPrintf(Buf, "<D:response>");
 361
 362                                 // Generate the 'href' tag for this message
 363                                 StrBufAppendPrintf(Buf, "<D:href>");
 364                                 StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 365                                 StrBufAppendPrintf(Buf, "/ctdl/r/");
 366                                 StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 367                                 StrBufAppendPrintf(Buf, "/");
 368                                 StrBufXMLEscAppend(Buf, NULL, e, strlen(e), 0);
 369                                 StrBufAppendPrintf(Buf, "</D:href>");
 370                                 StrBufAppendPrintf(Buf, "<D:propstat>");
 371                                 StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 372                                 StrBufAppendPrintf(Buf, "<D:prop>");
 373
 374                                 switch (c->room_default_view) {
 375                                 case VIEW_CALENDAR:
 376                                         StrBufAppendPrintf(Buf,
 377                                                            "<D:getcontenttype>text/calendar; component=vevent</D:getcontenttype>");
 378                                         break;
 379                                 case VIEW_TASKS:
 380                                         StrBufAppendPrintf(Buf,
 381                                                            "<D:getcontenttype>text/calendar; component=vtodo</D:getcontenttype>");
 382                                         break;
 383                                 case VIEW_ADDRESSBOOK:
 384                                         StrBufAppendPrintf(Buf, "<D:getcontenttype>text/x-vcard</D:getcontenttype>");
 385                                         break;
 386                                 }
 387
 388                                 if (timestamp > 0) {
 389                                         char *datestring = http_datestring(timestamp);
 390                                         if (datestring) {
 391                                                 StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 392                                                 StrBufXMLEscAppend(Buf, NULL, datestring, strlen(datestring), 0);
 393                                                 StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 394                                                 free(datestring);
 395                                         }
 396                                         if (enumerate_by_euid)  // FIXME ajc 2017oct30 should this be inside the timestamp conditional?
 397                                         {
 398                                                 StrBufAppendPrintf(Buf, "<D:getetag>\"%ld\"</D:getetag>", msglist[i]);
 399                                         }
 400                                 }
 401                                 StrBufAppendPrintf(Buf, "</D:prop></D:propstat></D:response>\n");
 402                                 free(e);
 403                         }
 404                         free(msglist);
 405                 };
 406         }
 407         // END COLLECTION
 408
 409         StrBufAppendPrintf(Buf, "</D:multistatus>\n");
 410
 411         add_response_header(h, strdup("Content-type"), strdup("text/xml"));
 412         h->response_code = 207;
 413         h->response_string = strdup("Multi-Status");
 414         h->response_body_length = StrLength(Buf);
 415         h->response_body = SmashStrBuf(&Buf);
 416 }
 417
 418 // some good examples here
 419 // http://blogs.nologin.es/rickyepoderi/index.php?/archives/14-Introducing-CalDAV-Part-I.html
 420
 421
 422 /*
 423  * Called by the_room_itself() when the HTTP method is PROPFIND
 424  */
 425 void get_the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 426 {
 427         JsonValue *j = NewJsonObject(HKEY("gotoroom"));
 428
 429         JsonObjectAppend(j, NewJsonPlainString(HKEY("name"), c->room, -1));
 430         JsonObjectAppend(j, NewJsonNumber(HKEY("current_view"), c->room_current_view));
 431         JsonObjectAppend(j, NewJsonNumber(HKEY("default_view"), c->room_default_view));
 432         JsonObjectAppend(j, NewJsonNumber(HKEY("new_messages"), c->new_messages));
 433         JsonObjectAppend(j, NewJsonNumber(HKEY("total_messages"), c->total_messages));
 434         JsonObjectAppend(j, NewJsonNumber(HKEY("last_seen"), c->last_seen));
 435
 436         StrBuf *sj = NewStrBuf();
 437         SerializeJson(sj, j, 1);        // '1' == free the source array
 438
 439         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 440         h->response_code = 200;
 441         h->response_string = strdup("OK");
 442         h->response_body_length = StrLength(sj);
 443         h->response_body = SmashStrBuf(&sj);
 444         return;
 445 }
 446
 447
 448 /*
 449  * Handle REST/DAV requests for the room itself (such as /ctdl/r/roomname
 450  * or /ctdl/r/roomname/ but *not* specific objects within the room)
 451  */
 452 void the_room_itself(struct http_transaction *h, struct ctdlsession *c)
 453 {
 454         // OPTIONS method on the room itself usually is a DAV client assessing what's here.
 455
 456         if (!strcasecmp(h->method, "OPTIONS")) {
 457                 options_the_room_itself(h, c);
 458                 return;
 459         }
 460         // PROPFIND method on the room itself could be looking for a directory
 461
 462         if (!strcasecmp(h->method, "PROPFIND")) {
 463                 propfind_the_room_itself(h, c);
 464                 return;
 465         }
 466         // REPORT method on the room itself is probably the dreaded CalDAV tower-of-crapola
 467
 468         if (!strcasecmp(h->method, "REPORT")) {
 469                 report_the_room_itself(h, c);
 470                 return;
 471         }
 472         // GET method on the room itself is an API call, possibly from our JavaScript front end
 473
 474         if (!strcasecmp(h->method, "get")) {
 475                 get_the_room_itself(h, c);
 476                 return;
 477         }
 478         // we probably want a "go to this room" for interactive access
 479         do_404(h);
 480 }
 481
 482
 483 /*
 484  * Dispatcher for "/ctdl/r" and "/ctdl/r/" for the room list
 485  */
 486 void room_list(struct http_transaction *h, struct ctdlsession *c)
 487 {
 488         char buf[1024];
 489         char roomname[1024];
 490
 491         ctdl_printf(c, "LKRA");
 492         ctdl_readline(c, buf, sizeof(buf));
 493         if (buf[0] != '1') {
 494                 do_502(h);
 495                 return;
 496         }
 497
 498         JsonValue *j = NewJsonArray(HKEY("lkra"));
 499         while (ctdl_readline(c, buf, sizeof(buf)), strcmp(buf, "000")) {
 500
 501                 // name|QRflags|QRfloor|QRorder|QRflags2|ra|current_view|default_view|mtime
 502                 JsonValue *jr = NewJsonObject(HKEY("room"));
 503
 504                 extract_token(roomname, buf, 0, '|', sizeof roomname);
 505                 JsonObjectAppend(jr, NewJsonPlainString(HKEY("name"), roomname, -1));
 506
 507                 int ra = extract_int(buf, 5);
 508                 JsonObjectAppend(jr, NewJsonBool(HKEY("known"), (ra && UA_KNOWN)));
 509                 JsonObjectAppend(jr, NewJsonBool(HKEY("hasnewmsgs"), (ra && UA_HASNEWMSGS)));
 510
 511                 int floor = extract_int(buf, 2);
 512                 JsonObjectAppend(jr, NewJsonNumber(HKEY("floor"), floor));
 513
 514                 int rorder = extract_int(buf, 3);
 515                 JsonObjectAppend(jr, NewJsonNumber(HKEY("rorder"), rorder));
 516
 517                 JsonArrayAppend(j, jr); // add the room to the array
 518         }
 519
 520         StrBuf *sj = NewStrBuf();
 521         SerializeJson(sj, j, 1);        // '1' == free the source array
 522
 523         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 524         h->response_code = 200;
 525         h->response_string = strdup("OK");
 526         h->response_body_length = StrLength(sj);
 527         h->response_body = SmashStrBuf(&sj);
 528 }
 529
 530
 531 /*
 532  * Dispatcher for paths starting with /ctdl/r/
 533  */
 534 void ctdl_r(struct http_transaction *h, struct ctdlsession *c)
 535 {
 536         char requested_roomname[128];
 537         char buf[1024];
 538
 539         // All room-related functions require being "in" the room specified.  Are we in that room already?
 540         extract_token(requested_roomname, h->uri, 3, '/', sizeof requested_roomname);
 541         unescape_input(requested_roomname);
 542
 543         if (IsEmptyStr(requested_roomname))     //      /ctdl/r/
 544         {
 545                 room_list(h, c);
 546                 return;
 547         }
 548         // If not, try to go there.
 549         if (strcasecmp(requested_roomname, c->room)) {
 550                 ctdl_printf(c, "GOTO %s", requested_roomname);
 551                 ctdl_readline(c, buf, sizeof(buf));
 552                 if (buf[0] == '2') {
 553                         // buf[3] will indicate whether any instant messages are waiting
 554                         extract_token(c->room, &buf[4], 0, '|', sizeof c->room);
 555                         c->new_messages = extract_int(&buf[4], 1);
 556                         c->total_messages = extract_int(&buf[4], 2);
 557                         //      3       (int)info                       Info flag: set to nonzero if the user needs to read this room's info file
 558                         //      4       (int)CCC->room.QRflags          Various flags associated with this room.
 559                         //      5       (long)CCC->room.QRhighest       The highest message number present in this room
 560                         c->last_seen = extract_long(&buf[4], 6);        // The highest message number the user has read in this room
 561                         //      7       (int)rmailflag                  Boolean flag: 1 if this is a Mail> room, 0 otherwise.
 562                         //      8       (int)raideflag                  Nonzero if user is either Aide or a Room Aide in this room
 563                         //      9       (int)newmailcount               The number of new Mail messages the user has
 564                         //      10      (int)CCC->room.QRfloor          The floor number this room resides on
 565                         c->room_current_view = extract_int(&buf[4], 11);
 566                         c->room_default_view = extract_int(&buf[4], 12);
 567                         //      13      (int)is_trash                   Boolean flag: 1 if this is the user's Trash folder, 0 otherwise.
 568                         //      14      (int)CCC->room.QRflags2         More flags associated with this room
 569                         //      15      (long)CCC->room.QRmtime         Timestamp of the last write activity in this room
 570                 } else {
 571                         do_404(h);
 572                         return;
 573                 }
 574         }
 575         // At this point our Citadel client session is "in" the specified room.
 576
 577         if (num_tokens(h->uri, '/') == 4)       //      /ctdl/r/roomname
 578         {
 579                 the_room_itself(h, c);
 580                 return;
 581         }
 582
 583         extract_token(buf, h->uri, 4, '/', sizeof buf);
 584         if (num_tokens(h->uri, '/') == 5) {
 585                 if (IsEmptyStr(buf)) {
 586                         the_room_itself(h, c);  //      /ctdl/r/roomname/       ( same as /ctdl/r/roomname )
 587                 } else {
 588                         object_in_room(h, c);   //      /ctdl/r/roomname/object
 589                 }
 590                 return;
 591         }
 592         if (num_tokens(h->uri, '/') == 6) {
 593                 object_in_room(h, c);   //      /ctdl/r/roomname/object/ or possibly /ctdl/r/roomname/object/component
 594                 return;
 595         }
 596         // If we get to this point, the client specified a valid room but requested an action we don't know how to perform.
 597         do_404(h);
 598 }