338f034ad04d9fc69437a3e66f86c225dc060c41
[citadel] / 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.
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 // 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 long *get_msglist(struct ctdlsession *c, char *which_msgs) {
22         char buf[1024];
23         long *msglist = NULL;
24         int num_msgs = 0;
25         int num_alloc = 0;
26
27         ctdl_printf(c, "MSGS %s", which_msgs);
28         ctdl_readline(c, buf, sizeof(buf));
29         if (buf[0] == '1') {
30                 do {
31                         if (num_msgs >= num_alloc) {
32                                 if (num_alloc == 0) {
33                                         num_alloc = 1024;
34                                         msglist = malloc(num_alloc * sizeof(long));
35                                 } else {
36                                         num_alloc *= 2;
37                                         msglist = realloc(msglist, num_alloc * sizeof(long));
38                                 }
39                         }
40                         ctdl_readline(c, buf, sizeof(buf));
41                         msglist[num_msgs++] = atol(buf);
42                 } while (strcmp(buf, "000"));   // this makes the last element a "0" terminator
43         }
44         return msglist;
45 }
46
47
48 // Supplied with a list of potential matches from an If-Match: or If-None-Match: header, and
49 // a message number (which we always use as the entity tag in Citadel), return nonzero if the
50 // message number matches any of the supplied tags in the string.
51 int match_etags(char *taglist, long msgnum) {
52         int num_tags = num_tokens(taglist, ',');
53         int i = 0;
54         char tag[1024];
55
56         if (msgnum <= 0) {                                      // no msgnum?  no match.
57                 return (0);
58         }
59
60         for (i = 0; i < num_tags; ++i) {
61                 extract_token(tag, taglist, i, ',', sizeof tag);
62                 striplt(tag);
63                 char *lq = (strchr(tag, '"'));
64                 char *rq = (strrchr(tag, '"'));
65                 if (lq < rq) {                                  // has two double quotes
66                         strcpy(rq, "");
67                         strcpy(tag, ++lq);
68                 }
69                 striplt(tag);
70                 if (!strcmp(tag, "*")) {                        // wildcard match
71                         return (1);
72                 }
73                 long tagmsgnum = atol(tag);
74                 if ((tagmsgnum > 0) && (tagmsgnum == msgnum)) { // match
75                         return (1);
76                 }
77         }
78
79         return (0);                                             // no match
80 }
81
82
83 // Client is requesting a message list
84 void json_msglist(struct http_transaction *h, struct ctdlsession *c, char *which) {
85         int i = 0;
86         long *msglist = get_msglist(c, which);
87         JsonValue *j = NewJsonArray(HKEY("msgs"));
88
89         if (msglist != NULL) {
90                 for (i = 0; msglist[i] > 0; ++i) {
91                         JsonArrayAppend(j, NewJsonNumber(HKEY("m"), msglist[i]));
92                 }
93                 free(msglist);
94         }
95
96         StrBuf *sj = NewStrBuf();
97         SerializeJson(sj, j, 1);        // '1' == free the source array
98
99         add_response_header(h, strdup("Content-type"), strdup("application/json"));
100         h->response_code = 200;
101         h->response_string = strdup("OK");
102         h->response_body_length = StrLength(sj);
103         h->response_body = SmashStrBuf(&sj);
104         return;
105 }
106
107
108 // Client requested an object in a room.
109 void object_in_room(struct http_transaction *h, struct ctdlsession *c) {
110         char buf[1024];
111         long msgnum = (-1);
112         char unescaped_euid[1024];
113
114         extract_token(buf, h->uri, 4, '/', sizeof buf);
115
116         if (!strncasecmp(buf, "msgs.", 5)) {    // Client is requesting a list of message numbers
117                 unescape_input(&buf[5]);
118                 json_msglist(h, c, &buf[5]);
119                 return;
120         }
121 #if 0
122         if (!strncasecmp(buf, "threads", 5)) {  // Client is requesting a threaded view (still kind of fuzzy here)
123                 threaded_view(h, c, &buf[5]);
124                 return;
125         }
126
127         if (!strncasecmp(buf, "flat", 5)) {     // Client is requesting a flat view (still kind of fuzzy here)
128                 flat_view(h, c, &buf[5]);
129                 return;
130         }
131 #endif
132
133         if ((c->room_default_view == VIEW_CALENDAR)     // room types where objects are referenced by EUID
134             || (c->room_default_view == VIEW_TASKS)
135             || (c->room_default_view == VIEW_ADDRESSBOOK)
136             ) {
137                 safestrncpy(unescaped_euid, buf, sizeof unescaped_euid);
138                 unescape_input(unescaped_euid);
139                 msgnum = locate_message_by_uid(c, unescaped_euid);
140         }
141         else {
142                 msgnum = atol(buf);
143         }
144
145         // All methods except PUT require the message to already exist
146         if ((msgnum <= 0) && (strcasecmp(h->method, "PUT"))) {
147                 do_404(h);
148         }
149
150         // If we get to this point we have a valid message number in an accessible room.
151         syslog(LOG_DEBUG, "msgnum is %ld, method is %s", msgnum, h->method);
152
153         // A sixth component in the URL can be one of two things:
154         // (1) a MIME part specifier, in which case the client wants to download that component within the message
155         // (2) a content-type, in which ase the client wants us to try to render it a certain way
156         if (num_tokens(h->uri, '/') == 6) {
157                 extract_token(buf, h->uri, 5, '/', sizeof buf);
158                 if (!IsEmptyStr(buf)) {
159                         if (!strcasecmp(buf, "json")) {
160                                 json_render_one_message(h, c, msgnum);
161                         } else {
162                                 download_mime_component(h, c, msgnum, buf);
163                         }
164                         return;
165                 }
166         }
167
168         // Ok, we want a full message, but first let's check for the if[-none]-match headers.
169         char *if_match = header_val(h, "If-Match");
170         if ((if_match != NULL) && (!match_etags(if_match, msgnum))) {
171                 do_412(h);
172                 return;
173         }
174
175         char *if_none_match = header_val(h, "If-None-Match");
176         if ((if_none_match != NULL) && (match_etags(if_none_match, msgnum))) {
177                 do_412(h);
178                 return;
179         }
180
181         // DOOOOOO ITTTTT!!!
182
183         if (!strcasecmp(h->method, "DELETE")) {
184                 dav_delete_message(h, c, msgnum);
185         }
186         else if (!strcasecmp(h->method, "GET")) {
187                 dav_get_message(h, c, msgnum);
188         }
189         else if (!strcasecmp(h->method, "PUT")) {
190                 dav_put_message(h, c, unescaped_euid, msgnum);
191         }
192         else {
193                 do_404(h);      // Got this far but the method made no sense?  Bummer.
194         }
195
196 }
197
198
199 // Called by the_room_itself() when the HTTP method is REPORT
200 void report_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
201         if (c->room_default_view == VIEW_CALENDAR) {
202                 caldav_report(h, c);    // CalDAV REPORTs ... fmgwac
203                 return;
204         }
205
206         do_404(h);              // future implementations like CardDAV will require code paths here
207 }
208
209
210 // Called by the_room_itself() when the HTTP method is OPTIONS
211 void options_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
212         h->response_code = 200;
213         h->response_string = strdup("OK");
214         if (c->room_default_view == VIEW_CALENDAR) {
215                 add_response_header(h, strdup("DAV"), strdup("1, calendar-access"));    // offer CalDAV
216         }
217         else if (c->room_default_view == VIEW_ADDRESSBOOK) {
218                 add_response_header(h, strdup("DAV"), strdup("1, addressbook"));        // offer CardDAV
219         }
220         else {
221                 add_response_header(h, strdup("DAV"), strdup("1"));     // ordinary WebDAV for all other room types
222         }
223         add_response_header(h, strdup("Allow"), strdup("OPTIONS, PROPFIND, GET, PUT, REPORT, DELETE"));
224 }
225
226
227 // Called by the_room_itself() when the HTTP method is PROPFIND
228 void propfind_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
229         char *e;
230         long timestamp;
231         int dav_depth = (header_val(h, "Depth") ? atoi(header_val(h, "Depth")) : INT_MAX);
232         syslog(LOG_DEBUG, "Client PROPFIND requested depth: %d", dav_depth);
233         StrBuf *Buf = NewStrBuf();
234
235         StrBufAppendPrintf(Buf, "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
236                            "<D:multistatus " "xmlns:D=\"DAV:\" " "xmlns:C=\"urn:ietf:params:xml:ns:caldav\"" ">");
237
238         // Transmit the collection resource
239         StrBufAppendPrintf(Buf, "<D:response>");
240         StrBufAppendPrintf(Buf, "<D:href>");
241         StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
242         StrBufAppendPrintf(Buf, "/ctdl/r/");
243         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
244         StrBufAppendPrintf(Buf, "</D:href>");
245
246         StrBufAppendPrintf(Buf, "<D:propstat>");
247         StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
248         StrBufAppendPrintf(Buf, "<D:prop>");
249         StrBufAppendPrintf(Buf, "<D:displayname>");
250         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
251         StrBufAppendPrintf(Buf, "</D:displayname>");
252
253         StrBufAppendPrintf(Buf, "<D:owner />"); // empty owner ought to be legal; see rfc3744 section 5.1
254
255         StrBufAppendPrintf(Buf, "<D:resourcetype><D:collection />");
256         switch (c->room_default_view) {
257         case VIEW_CALENDAR:
258                 StrBufAppendPrintf(Buf, "<C:calendar />");      // RFC4791 section 4.2
259                 break;
260         }
261         StrBufAppendPrintf(Buf, "</D:resourcetype>");
262
263         int enumerate_by_euid = 0;      // nonzero if messages will be retrieved by euid instead of msgnum
264         switch (c->room_default_view) {
265         case VIEW_CALENDAR:             // RFC4791 section 5.2
266                 StrBufAppendPrintf(Buf, "<C:supported-calendar-component-set><C:comp name=\"VEVENT\"/></C:supported-calendar-component-set>");
267                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
268                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
269                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
270                 enumerate_by_euid = 1;
271                 break;
272         case VIEW_TASKS:                // RFC4791 section 5.2
273                 StrBufAppendPrintf(Buf, "<C:supported-calendar-component-set><C:comp name=\"VTODO\"/></C:supported-calendar-component-set>");
274                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
275                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
276                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
277                 enumerate_by_euid = 1;
278                 break;
279         case VIEW_ADDRESSBOOK:          // FIXME put some sort of CardDAV crapola here when we implement it
280                 enumerate_by_euid = 1;
281                 break;
282         case VIEW_WIKI:                 // FIXME invent "WikiDAV" ?
283                 enumerate_by_euid = 1;
284                 break;
285         }
286
287         // FIXME get the mtime
288         // StrBufAppendPrintf(Buf, "<D:getlastmodified>");
289         // escputs(datestring);
290         // StrBufAppendPrintf(Buf, "</D:getlastmodified>");
291
292         StrBufAppendPrintf(Buf, "</D:prop>");
293         StrBufAppendPrintf(Buf, "</D:propstat>");
294         StrBufAppendPrintf(Buf, "</D:response>\n");
295
296         // If a depth greater than zero was specified, transmit the collection listing
297         // BEGIN COLLECTION
298         if (dav_depth > 0) {
299                 long *msglist = get_msglist(c, "ALL");
300                 if (msglist) {
301                         int i;
302                         for (i = 0; (msglist[i] > 0); ++i) {
303                                 if ((i % 10) == 0)
304                                         syslog(LOG_DEBUG, "PROPFIND enumerated %d messages", i);
305                                 e = NULL;       // EUID gets stored here
306                                 timestamp = 0;
307
308                                 char cbuf[1024];
309                                 ctdl_printf(c, "MSG0 %ld|3", msglist[i]);
310                                 ctdl_readline(c, cbuf, sizeof(cbuf));
311                                 if (cbuf[0] == '1')
312                                         while (ctdl_readline(c, cbuf, sizeof(cbuf)), strcmp(cbuf, "000")) {
313                                                 if ((enumerate_by_euid) && (!strncasecmp(cbuf, "exti=", 5))) {
314                                                         // e = strdup(&cbuf[5]);
315                                                         int elen = (2 * strlen(&cbuf[5]));
316                                                         e = malloc(elen);
317                                                         urlesc(e, elen, &cbuf[5]);
318                                                 }
319                                                 if (!strncasecmp(cbuf, "time=", 5)) {
320                                                         timestamp = atol(&cbuf[5]);
321                                                 }
322                                         }
323                                 if (e == NULL) {
324                                         e = malloc(20);
325                                         sprintf(e, "%ld", msglist[i]);
326                                 }
327                                 StrBufAppendPrintf(Buf, "<D:response>");
328
329                                 // Generate the 'href' tag for this message
330                                 StrBufAppendPrintf(Buf, "<D:href>");
331                                 StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
332                                 StrBufAppendPrintf(Buf, "/ctdl/r/");
333                                 StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
334                                 StrBufAppendPrintf(Buf, "/");
335                                 StrBufXMLEscAppend(Buf, NULL, e, strlen(e), 0);
336                                 StrBufAppendPrintf(Buf, "</D:href>");
337                                 StrBufAppendPrintf(Buf, "<D:propstat>");
338                                 StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
339                                 StrBufAppendPrintf(Buf, "<D:prop>");
340
341                                 switch (c->room_default_view) {
342                                 case VIEW_CALENDAR:
343                                         StrBufAppendPrintf(Buf,
344                                                            "<D:getcontenttype>text/calendar; component=vevent</D:getcontenttype>");
345                                         break;
346                                 case VIEW_TASKS:
347                                         StrBufAppendPrintf(Buf,
348                                                            "<D:getcontenttype>text/calendar; component=vtodo</D:getcontenttype>");
349                                         break;
350                                 case VIEW_ADDRESSBOOK:
351                                         StrBufAppendPrintf(Buf, "<D:getcontenttype>text/x-vcard</D:getcontenttype>");
352                                         break;
353                                 }
354
355                                 if (timestamp > 0) {
356                                         char *datestring = http_datestring(timestamp);
357                                         if (datestring) {
358                                                 StrBufAppendPrintf(Buf, "<D:getlastmodified>");
359                                                 StrBufXMLEscAppend(Buf, NULL, datestring, strlen(datestring), 0);
360                                                 StrBufAppendPrintf(Buf, "</D:getlastmodified>");
361                                                 free(datestring);
362                                         }
363                                         if (enumerate_by_euid)  // FIXME ajc 2017oct30 should this be inside the timestamp conditional?
364                                         {
365                                                 StrBufAppendPrintf(Buf, "<D:getetag>\"%ld\"</D:getetag>", msglist[i]);
366                                         }
367                                 }
368                                 StrBufAppendPrintf(Buf, "</D:prop></D:propstat></D:response>\n");
369                                 free(e);
370                         }
371                         free(msglist);
372                 };
373         }
374         // END COLLECTION
375
376         StrBufAppendPrintf(Buf, "</D:multistatus>\n");
377
378         add_response_header(h, strdup("Content-type"), strdup("text/xml"));
379         h->response_code = 207;
380         h->response_string = strdup("Multi-Status");
381         h->response_body_length = StrLength(Buf);
382         h->response_body = SmashStrBuf(&Buf);
383 }
384
385 // some good examples here
386 // http://blogs.nologin.es/rickyepoderi/index.php?/archives/14-Introducing-CalDAV-Part-I.html
387
388
389 // Called by the_room_itself() when the HTTP method is PROPFIND
390 void get_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
391         JsonValue *j = NewJsonObject(HKEY("gotoroom"));
392
393         JsonObjectAppend(j, NewJsonPlainString(HKEY("name"), c->room, -1));
394         JsonObjectAppend(j, NewJsonNumber(HKEY("current_view"), c->room_current_view));
395         JsonObjectAppend(j, NewJsonNumber(HKEY("default_view"), c->room_default_view));
396         JsonObjectAppend(j, NewJsonNumber(HKEY("new_messages"), c->new_messages));
397         JsonObjectAppend(j, NewJsonNumber(HKEY("total_messages"), c->total_messages));
398         JsonObjectAppend(j, NewJsonNumber(HKEY("last_seen"), c->last_seen));
399
400         StrBuf *sj = NewStrBuf();
401         SerializeJson(sj, j, 1);        // '1' == free the source array
402
403         add_response_header(h, strdup("Content-type"), strdup("application/json"));
404         h->response_code = 200;
405         h->response_string = strdup("OK");
406         h->response_body_length = StrLength(sj);
407         h->response_body = SmashStrBuf(&sj);
408         return;
409 }
410
411
412 // Handle REST/DAV requests for the room itself (such as /ctdl/r/roomname
413 // or /ctdl/r/roomname/ but *not* specific objects within the room)
414 void the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
415
416         // OPTIONS method on the room itself usually is a DAV client assessing what's here.
417         if (!strcasecmp(h->method, "OPTIONS")) {
418                 options_the_room_itself(h, c);
419                 return;
420         }
421
422         // PROPFIND method on the room itself could be looking for a directory
423         if (!strcasecmp(h->method, "PROPFIND")) {
424                 propfind_the_room_itself(h, c);
425                 return;
426         }
427
428         // REPORT method on the room itself is probably the dreaded CalDAV tower-of-crapola
429         if (!strcasecmp(h->method, "REPORT")) {
430                 report_the_room_itself(h, c);
431                 return;
432         }
433
434         // GET method on the room itself is an API call, possibly from our JavaScript front end
435         if (!strcasecmp(h->method, "get")) {
436                 get_the_room_itself(h, c);
437                 return;
438         }
439
440         // we probably want a "go to this room" for interactive access
441         do_404(h);
442 }
443
444
445 // Dispatcher for "/ctdl/r" and "/ctdl/r/" for the room list
446 void room_list(struct http_transaction *h, struct ctdlsession *c) {
447         char buf[1024];
448         char roomname[1024];
449
450         ctdl_printf(c, "LKRA");
451         ctdl_readline(c, buf, sizeof(buf));
452         if (buf[0] != '1') {
453                 do_502(h);
454                 return;
455         }
456
457         JsonValue *j = NewJsonArray(HKEY("lkra"));
458         while (ctdl_readline(c, buf, sizeof(buf)), strcmp(buf, "000")) {
459
460                 // name|QRflags|QRfloor|QRorder|QRflags2|ra|current_view|default_view|mtime
461                 JsonValue *jr = NewJsonObject(HKEY("room"));
462
463                 extract_token(roomname, buf, 0, '|', sizeof roomname);
464                 JsonObjectAppend(jr, NewJsonPlainString(HKEY("name"), roomname, -1));
465
466                 int ra = extract_int(buf, 5);
467                 JsonObjectAppend(jr, NewJsonBool(HKEY("known"), (ra & UA_KNOWN)));
468                 JsonObjectAppend(jr, NewJsonBool(HKEY("hasnewmsgs"), (ra & UA_HASNEWMSGS)));
469
470                 int floor = extract_int(buf, 2);
471                 JsonObjectAppend(jr, NewJsonNumber(HKEY("floor"), floor));
472
473                 int rorder = extract_int(buf, 3);
474                 JsonObjectAppend(jr, NewJsonNumber(HKEY("rorder"), rorder));
475
476                 JsonArrayAppend(j, jr); // add the room to the array
477         }
478
479         StrBuf *sj = NewStrBuf();
480         SerializeJson(sj, j, 1);        // '1' == free the source array
481
482         add_response_header(h, strdup("Content-type"), strdup("application/json"));
483         h->response_code = 200;
484         h->response_string = strdup("OK");
485         h->response_body_length = StrLength(sj);
486         h->response_body = SmashStrBuf(&sj);
487 }
488
489
490 // Dispatcher for paths starting with /ctdl/r/
491 void ctdl_r(struct http_transaction *h, struct ctdlsession *c) {
492         char requested_roomname[128];
493         char buf[1024];
494
495         // All room-related functions require being "in" the room specified.  Are we in that room already?
496         extract_token(requested_roomname, h->uri, 3, '/', sizeof requested_roomname);
497         unescape_input(requested_roomname);
498
499         if (IsEmptyStr(requested_roomname))     //      /ctdl/r/
500         {
501                 room_list(h, c);
502                 return;
503         }
504         // If not, try to go there.
505         if (strcasecmp(requested_roomname, c->room)) {
506                 ctdl_printf(c, "GOTO %s", requested_roomname);
507                 ctdl_readline(c, buf, sizeof(buf));
508                 if (buf[0] == '2') {
509                         // buf[3] will indicate whether any instant messages are waiting
510                         extract_token(c->room, &buf[4], 0, '|', sizeof c->room);
511                         c->new_messages = extract_int(&buf[4], 1);
512                         c->total_messages = extract_int(&buf[4], 2);
513                         //      3       (int)info                       Info flag: set to nonzero if the user needs to read this room's info file
514                         //      4       (int)CCC->room.QRflags          Various flags associated with this room.
515                         //      5       (long)CCC->room.QRhighest       The highest message number present in this room
516                         c->last_seen = extract_long(&buf[4], 6);        // The highest message number the user has read in this room
517                         //      7       (int)rmailflag                  Boolean flag: 1 if this is a Mail> room, 0 otherwise.
518                         //      8       (int)raideflag                  Nonzero if user is either Aide or a Room Aide in this room
519                         //      9       (int)newmailcount               The number of new Mail messages the user has
520                         //      10      (int)CCC->room.QRfloor          The floor number this room resides on
521                         c->room_current_view = extract_int(&buf[4], 11);
522                         c->room_default_view = extract_int(&buf[4], 12);
523                         //      13      (int)is_trash                   Boolean flag: 1 if this is the user's Trash folder, 0 otherwise.
524                         //      14      (int)CCC->room.QRflags2         More flags associated with this room
525                         //      15      (long)CCC->room.QRmtime         Timestamp of the last write activity in this room
526                 } else {
527                         do_404(h);
528                         return;
529                 }
530         }
531         // At this point our Citadel client session is "in" the specified room.
532
533         if (num_tokens(h->uri, '/') == 4)       //      /ctdl/r/roomname
534         {
535                 the_room_itself(h, c);
536                 return;
537         }
538
539         extract_token(buf, h->uri, 4, '/', sizeof buf);
540         if (num_tokens(h->uri, '/') == 5) {
541                 if (IsEmptyStr(buf)) {
542                         the_room_itself(h, c);  //      /ctdl/r/roomname/       ( same as /ctdl/r/roomname )
543                 } else {
544                         object_in_room(h, c);   //      /ctdl/r/roomname/object
545                 }
546                 return;
547         }
548         if (num_tokens(h->uri, '/') == 6) {
549                 object_in_room(h, c);   //      /ctdl/r/roomname/object/ or possibly /ctdl/r/roomname/object/component
550                 return;
551         }
552         // If we get to this point, the client specified a valid room but requested an action we don't know how to perform.
553         do_404(h);
554 }