citadel/modules/wiki/serv_wiki.c

   1 /*
   2  * $Id$
   3  *
   4  * Server-side module for Wiki rooms.  This handles things like version control.
   5  *
   6  * Copyright (c) 2009 by the citadel.org team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "sysdep.h"
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <pwd.h>
  30 #include <errno.h>
  31 #include <ctype.h>
  32 #include <sys/types.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <sys/wait.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <libcitadel.h>
  49 #include "citadel.h"
  50 #include "server.h"
  51 #include "citserver.h"
  52 #include "support.h"
  53 #include "config.h"
  54 #include "control.h"
  55 #include "user_ops.h"
  56 #include "policy.h"
  57 #include "database.h"
  58 #include "msgbase.h"
  59 #include "euidindex.h"
  60 #include "ctdl_module.h"
  61
  62 /*
  63  * Data passed back and forth between wiki_rev() and its MIME parser callback
  64  */
  65 struct HistoryEraserCallBackData {
  66         char *tempfilename;             /* name of temp file being patched */
  67         char *stop_when;                /* stop when we hit this uuid */
  68         int done;                       /* set to nonzero when we're done patching */
  69 };
  70
  71 /*
  72  * Name of the temporary room we create to store old revisions when someone requests them.
  73  * We put it in an invalid namespace so the DAP cleans up after us later.
  74  */
  75 char *wwm = "9999999999.WikiWaybackMachine";
  76
  77 /*
  78  * Before allowing a wiki page save to execute, we have to perform version control.
  79  * This involves fetching the old version of the page if it exists.
  80  */
  81 int wiki_upload_beforesave(struct CtdlMessage *msg) {
  82         struct CitContext *CCC = CC;
  83         long old_msgnum = (-1L);
  84         struct CtdlMessage *old_msg = NULL;
  85         long history_msgnum = (-1L);
  86         struct CtdlMessage *history_msg = NULL;
  87         char diff_old_filename[PATH_MAX];
  88         char diff_new_filename[PATH_MAX];
  89         char diff_cmd[PATH_MAX];
  90         FILE *fp;
  91         int rv;
  92         char history_page[1024];
  93         char boundary[256];
  94         char prefixed_boundary[258];
  95         char buf[1024];
  96         int nbytes = 0;
  97         char *diffbuf = NULL;
  98         size_t diffbuf_len = 0;
  99         char *ptr = NULL;
 100
 101         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
 102
 103         /* Is this a room with a Wiki in it, don't run this hook. */
 104         if (CCC->room.QRdefaultview != VIEW_WIKI) {
 105                 return(0);
 106         }
 107
 108         /* If this isn't a MIME message, don't bother. */
 109         if (msg->cm_format_type != 4) return(0);
 110
 111         /* If there's no EUID we can't do this.  Reject the post. */
 112         if (msg->cm_fields['E'] == NULL) return(1);
 113
 114         snprintf(history_page, sizeof history_page, "%s_HISTORY_", msg->cm_fields['E']);
 115
 116         /* Make sure we're saving a real wiki page rather than a wiki history page.
 117          * This is important in order to avoid recursing infinitely into this hook.
 118          */
 119         if (    (strlen(msg->cm_fields['E']) >= 9)
 120                 && (!strcasecmp(&msg->cm_fields['E'][strlen(msg->cm_fields['E'])-9], "_HISTORY_"))
 121         ) {
 122                 CtdlLogPrintf(CTDL_DEBUG, "History page not being historied\n");
 123                 return(0);
 124         }
 125
 126         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 127         if (msg->cm_fields['M'] == NULL) return(0);
 128
 129         /* Set the message subject identical to the page name */
 130         if (msg->cm_fields['U'] != NULL) {
 131                 free(msg->cm_fields['U']);
 132         }
 133         msg->cm_fields['U'] = strdup(msg->cm_fields['E']);
 134
 135         /* See if we can retrieve the previous version. */
 136         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields['E'], &CCC->room);
 137         if (old_msgnum > 0L) {
 138                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 139         }
 140         else {
 141                 old_msg = NULL;
 142         }
 143
 144         if ((old_msg != NULL) && (old_msg->cm_fields['M'] == NULL)) {   /* old version is corrupt? */
 145                 CtdlFreeMessage(old_msg);
 146                 old_msg = NULL;
 147         }
 148
 149         /* If no changes were made, don't bother saving it again */
 150         if ((old_msg != NULL) && (!strcmp(msg->cm_fields['M'], old_msg->cm_fields['M']))) {
 151                 CtdlFreeMessage(old_msg);
 152                 return(1);
 153         }
 154
 155         /*
 156          * Generate diffs
 157          */
 158         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 159         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 160
 161         if (old_msg != NULL) {
 162                 fp = fopen(diff_old_filename, "w");
 163                 rv = fwrite(old_msg->cm_fields['M'], strlen(old_msg->cm_fields['M']), 1, fp);
 164                 fclose(fp);
 165                 CtdlFreeMessage(old_msg);
 166         }
 167
 168         fp = fopen(diff_new_filename, "w");
 169         rv = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 170         fclose(fp);
 171
 172         diffbuf_len = 0;
 173         diffbuf = NULL;
 174         snprintf(diff_cmd, sizeof diff_cmd,
 175                 "diff -u %s %s",
 176                 diff_new_filename,
 177                 ((old_msg != NULL) ? diff_old_filename : "/dev/null")
 178         );
 179         fp = popen(diff_cmd, "r");
 180         if (fp != NULL) {
 181                 do {
 182                         diffbuf = realloc(diffbuf, diffbuf_len + 1025);
 183                         nbytes = fread(&diffbuf[diffbuf_len], 1, 1024, fp);
 184                         diffbuf_len += nbytes;
 185                 } while (nbytes == 1024);
 186                 diffbuf[diffbuf_len] = 0;
 187                 if (pclose(fp) != 0) {
 188                         CtdlLogPrintf(CTDL_ERR, "pclose() returned an error - diff failed\n");
 189                 }
 190         }
 191         CtdlLogPrintf(CTDL_DEBUG, "diff length is %d bytes\n", diffbuf_len);
 192
 193         unlink(diff_old_filename);
 194         unlink(diff_new_filename);
 195
 196         /* Determine whether this was a bogus (empty) edit */
 197         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 198                 free(diffbuf);
 199                 diffbuf = NULL;
 200         }
 201         if (diffbuf == NULL) {
 202                 return(1);              /* No changes at all?  Abandon the post entirely! */
 203         }
 204
 205         /* Now look for the existing edit history */
 206
 207         history_msgnum = CtdlLocateMessageByEuid(history_page, &CCC->room);
 208         history_msg = NULL;
 209         if (history_msgnum > 0L) {
 210                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 211         }
 212
 213         /* Create a new history message if necessary */
 214         if (history_msg == NULL) {
 215                 history_msg = malloc(sizeof(struct CtdlMessage));
 216                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 217                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 218                 history_msg->cm_anon_type = MES_NORMAL;
 219                 history_msg->cm_format_type = FMT_RFC822;
 220                 history_msg->cm_fields['A'] = strdup("Citadel");
 221                 history_msg->cm_fields['R'] = strdup(CCC->room.QRname);
 222                 history_msg->cm_fields['E'] = strdup(history_page);
 223                 history_msg->cm_fields['U'] = strdup(history_page);
 224                 history_msg->cm_fields['1'] = strdup("1");              /* suppress full text indexing */
 225                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 226                 history_msg->cm_fields['M'] = malloc(1024);
 227                 snprintf(history_msg->cm_fields['M'], 1024,
 228                         "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 229                         "This is a Citadel wiki history encoded as multipart MIME.\n"
 230                         "Each part is comprised of a diff script representing one change set.\n"
 231                         "\n"
 232                         "--%s--\n"
 233                         ,
 234                         boundary, boundary
 235                 );
 236         }
 237
 238         /* Update the history message (regardless of whether it's new or existing) */
 239
 240         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 241          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 242          */
 243         if (history_msg->cm_fields['I'] != NULL) {
 244                 free(history_msg->cm_fields['I']);
 245         }
 246
 247         /* Figure out the boundary string.  We do this even when we generated the
 248          * boundary string in the above code, just to be safe and consistent.
 249          */
 250         strcpy(boundary, "");
 251
 252         ptr = history_msg->cm_fields['M'];
 253         do {
 254                 ptr = memreadline(ptr, buf, sizeof buf);
 255                 if (*ptr != 0) {
 256                         striplt(buf);
 257                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 258                                 if (
 259                                         (bmstrcasestr(buf, "multipart") != NULL)
 260                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 261                                 ) {
 262                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 263                                         char *qu;
 264                                         qu = strchr(boundary, '\"');
 265                                         if (qu) {
 266                                                 strcpy(boundary, ++qu);
 267                                         }
 268                                         qu = strchr(boundary, '\"');
 269                                         if (qu) {
 270                                                 *qu = 0;
 271                                         }
 272                                 }
 273                         }
 274                 }
 275         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 276
 277         /* Now look for the first boundary.  That is where we need to insert our fun.
 278          */
 279         if (!IsEmptyStr(boundary)) {
 280                 snprintf(prefixed_boundary, sizeof prefixed_boundary, "--%s", boundary);
 281                 history_msg->cm_fields['M'] = realloc(history_msg->cm_fields['M'],
 282                         strlen(history_msg->cm_fields['M']) + strlen(diffbuf) + 1024
 283                 );
 284                 ptr = bmstrcasestr(history_msg->cm_fields['M'], prefixed_boundary);
 285                 if (ptr != NULL) {
 286                         char *the_rest_of_it = strdup(ptr);
 287                         char uuid[32];
 288                         char memo[512];
 289                         char encoded_memo[768];
 290                         generate_uuid(uuid);
 291                         snprintf(memo, sizeof memo, "%s|%ld|%s|%s",
 292                                 uuid,
 293                                 time(NULL),
 294                                 CCC->user.fullname,
 295                                 config.c_nodename
 296                                 /* no longer logging CCC->cs_inet_email */
 297                         );
 298                         CtdlEncodeBase64(encoded_memo, memo, strlen(memo), 0);
 299                         sprintf(ptr, "--%s\n"
 300                                         "Content-type: text/plain\n"
 301                                         "Content-Disposition: inline; filename=\"%s\"\n"
 302                                         "Content-Transfer-Encoding: 8bit\n"
 303                                         "\n"
 304                                         "%s\n"
 305                                         "%s"
 306                                         ,
 307                                 boundary,
 308                                 encoded_memo,
 309                                 diffbuf,
 310                                 the_rest_of_it
 311                         );
 312                         free(the_rest_of_it);
 313                 }
 314
 315                 history_msg->cm_fields['T'] = realloc(history_msg->cm_fields['T'], 32);
 316                 snprintf(history_msg->cm_fields['T'], 32, "%ld", time(NULL));
 317
 318                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 319         }
 320         else {
 321                 CtdlLogPrintf(CTDL_ALERT, "Empty boundary string in history message.  No history!\n");
 322         }
 323
 324         free(diffbuf);
 325         free(history_msg);
 326         return(0);
 327 }
 328
 329
 330 /*
 331  * MIME Parser callback for wiki_history()
 332  *
 333  * The "filename" field will contain a memo field.  All we have to do is decode
 334  * the base64 and output it.  The data is already in a delimited format suitable
 335  * for our client protocol.
 336  */
 337 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 338                    void *content, char *cbtype, char *cbcharset, size_t length,
 339                    char *encoding, char *cbid, void *cbuserdata)
 340 {
 341         char memo[1024];
 342
 343         CtdlDecodeBase64(memo, filename, strlen(filename));
 344         cprintf("%s\n", memo);
 345 }
 346
 347
 348 /*
 349  * Fetch a list of revisions for a particular wiki page
 350  */
 351 void wiki_history(char *pagename) {
 352         int r;
 353         char history_page_name[270];
 354         long msgnum;
 355         struct CtdlMessage *msg;
 356
 357         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 358         if (r != om_ok) {
 359                 if (r == om_not_logged_in) {
 360                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 361                 }
 362                 else {
 363                         cprintf("%d An unknown error has occurred.\n", ERROR);
 364                 }
 365                 return;
 366         }
 367
 368         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 369         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 370         if (msgnum > 0L) {
 371                 msg = CtdlFetchMessage(msgnum, 1);
 372         }
 373         else {
 374                 msg = NULL;
 375         }
 376
 377         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 378                 CtdlFreeMessage(msg);
 379                 msg = NULL;
 380         }
 381
 382         if (msg == NULL) {
 383                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 384                 return;
 385         }
 386
 387
 388         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 389         mime_parser(msg->cm_fields['M'], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 390         cprintf("000\n");
 391
 392         CtdlFreeMessage(msg);
 393         return;
 394 }
 395
 396 /*
 397  * MIME Parser callback for wiki_rev()
 398  *
 399  * The "filename" field will contain a memo field, which includes (among other things)
 400  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 401  *
 402  * The "content" filed will contain "diff" output suitable for applying via "patch"
 403  * to our temporary file.
 404  */
 405 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 406                    void *content, char *cbtype, char *cbcharset, size_t length,
 407                    char *encoding, char *cbid, void *cbuserdata)
 408 {
 409         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 410         char memo[1024];
 411         char this_rev[256];
 412         FILE *fp;
 413         char *ptr = NULL;
 414         char buf[1024];
 415
 416         /* Did a previous callback already indicate that we've reached our target uuid?
 417          * If so, don't process anything else.
 418          */
 419         if (hecbd->done) {
 420                 return;
 421         }
 422
 423         CtdlDecodeBase64(memo, filename, strlen(filename));
 424         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 425         CtdlLogPrintf(CTDL_DEBUG, "callback found rev: %s\n", this_rev);
 426
 427         /* Perform the patch */
 428         fp = popen("patch -f -s -p0 --global-reject-file=/dev/null >/dev/null 2>/dev/null", "w");
 429         if (fp) {
 430                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 431                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 432                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 433
 434                 ptr = (char *)content;
 435                 int linenum = 0;
 436                 do {
 437                         ++linenum;
 438                         ptr = memreadline(ptr, buf, sizeof buf);
 439                         if (*ptr != 0) {
 440                                 if (linenum <= 2) {
 441                                         /* skip the first two lines; they contain bogus filenames */
 442                                 }
 443                                 else {
 444                                         fprintf(fp, "%s\n", buf);
 445                                 }
 446                         }
 447                 } while ((*ptr != 0) && ((int)ptr < ((int)content + length)));
 448                 if (pclose(fp) != 0) {
 449                         CtdlLogPrintf(CTDL_ERR, "pclose() returned an error - patch failed\n");
 450                 }
 451         }
 452
 453         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 454                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 455                 CtdlLogPrintf(CTDL_DEBUG, "Target revision has been reached -- stop patching.\n");
 456                 hecbd->done = 1;
 457         }
 458 }
 459
 460
 461 /*
 462  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 463  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 464  * to revert the currently active page to that revision.
 465  */
 466 void wiki_rev(char *pagename, char *rev, char *operation)
 467 {
 468         int r;
 469         char history_page_name[270];
 470         long msgnum;
 471         char temp[PATH_MAX];
 472         char timestamp[64];
 473         struct CtdlMessage *msg;
 474         FILE *fp;
 475         struct HistoryEraserCallBackData hecbd;
 476         long len = 0L;
 477         int rv;
 478
 479         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 480         if (r != om_ok) {
 481                 if (r == om_not_logged_in) {
 482                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 483                 }
 484                 else {
 485                         cprintf("%d An unknown error has occurred.\n", ERROR);
 486                 }
 487                 return;
 488         }
 489
 490         /* Begin by fetching the current version of the page.  We're going to patch
 491          * backwards through the diffs until we get the one we want.
 492          */
 493         msgnum = CtdlLocateMessageByEuid(pagename, &CC->room);
 494         if (msgnum > 0L) {
 495                 msg = CtdlFetchMessage(msgnum, 1);
 496         }
 497         else {
 498                 msg = NULL;
 499         }
 500
 501         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 502                 CtdlFreeMessage(msg);
 503                 msg = NULL;
 504         }
 505
 506         if (msg == NULL) {
 507                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 508                 return;
 509         }
 510
 511         /* Output it to a temporary file */
 512
 513         CtdlMakeTempFileName(temp, sizeof temp);
 514         fp = fopen(temp, "w");
 515         if (fp != NULL) {
 516                 r = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 517                 fclose(fp);
 518         }
 519         else {
 520                 CtdlLogPrintf(CTDL_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 521         }
 522         CtdlFreeMessage(msg);
 523
 524         /* Get the revision history */
 525
 526         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 527         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 528         if (msgnum > 0L) {
 529                 msg = CtdlFetchMessage(msgnum, 1);
 530         }
 531         else {
 532                 msg = NULL;
 533         }
 534
 535         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 536                 CtdlFreeMessage(msg);
 537                 msg = NULL;
 538         }
 539
 540         if (msg == NULL) {
 541                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 542                 return;
 543         }
 544
 545         /* Start patching backwards (newest to oldest) through the revision history until we
 546          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 547          */
 548
 549         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 550         hecbd.tempfilename = temp;
 551         hecbd.stop_when = rev;
 552
 553         mime_parser(msg->cm_fields['M'], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 554         CtdlFreeMessage(msg);
 555
 556         /* Were we successful? */
 557         if (hecbd.done == 0) {
 558                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 559                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 560                 );
 561         }
 562
 563         /* We have the desired revision on disk.  Now do something with it. */
 564
 565         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 566                 msg = malloc(sizeof(struct CtdlMessage));
 567                 memset(msg, 0, sizeof(struct CtdlMessage));
 568                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 569                 msg->cm_anon_type = MES_NORMAL;
 570                 msg->cm_format_type = FMT_RFC822;
 571                 fp = fopen(temp, "r");
 572                 if (fp) {
 573                         fseek(fp, 0L, SEEK_END);
 574                         len = ftell(fp);
 575                         fseek(fp, 0L, SEEK_SET);
 576                         msg->cm_fields['M'] = malloc(len + 1);
 577                         rv = fread(msg->cm_fields['M'], len, 1, fp);
 578                         CtdlLogPrintf(CTDL_DEBUG, "\033[32mdid %d blocks of %d bytes\033[0m\n", rv, len);
 579                         msg->cm_fields['M'][len] = 0;
 580                         fclose(fp);
 581                 }
 582                 if (len <= 0) {
 583                         msgnum = (-1L);
 584                 }
 585                 else if (!strcasecmp(operation, "fetch")) {
 586                         msg->cm_fields['A'] = strdup("Citadel");
 587                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 588                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 589                 }
 590                 else if (!strcasecmp(operation, "revert")) {
 591                         snprintf(timestamp, sizeof timestamp, "%ld", time(NULL));
 592                         msg->cm_fields['T'] = strdup(timestamp);
 593                         msg->cm_fields['A'] = strdup(CC->user.fullname);
 594                         msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 595                         msg->cm_fields['O'] = strdup(CC->room.QRname);
 596                         msg->cm_fields['N'] = strdup(NODENAME);
 597                         msg->cm_fields['E'] = strdup(pagename);
 598                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 599                 }
 600                 else {
 601                         /* Theoretically it is impossible to get here, but throw an error anyway */
 602                         msgnum = (-1L);
 603                 }
 604                 CtdlFreeMessage(msg);
 605                 if (msgnum >= 0L) {
 606                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 607                 }
 608                 else {
 609                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 610                 }
 611         }
 612
 613         /* We did all this work for nothing.  Express anguish to the caller. */
 614         else {
 615                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 616         }
 617
 618         unlink(temp);
 619         return;
 620 }
 621
 622
 623
 624 /*
 625  * commands related to wiki management
 626  */
 627 void cmd_wiki(char *argbuf) {
 628         char subcmd[32];
 629         char pagename[256];
 630         char rev[128];
 631         char operation[16];
 632
 633         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 634
 635         if (!strcasecmp(subcmd, "history")) {
 636                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 637                 wiki_history(pagename);
 638                 return;
 639         }
 640
 641         if (!strcasecmp(subcmd, "rev")) {
 642                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 643                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 644                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 645                 wiki_rev(pagename, rev, operation);
 646                 return;
 647         }
 648
 649         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 650 }
 651
 652
 653
 654 /*
 655  * Module initialization
 656  */
 657 CTDL_MODULE_INIT(wiki)
 658 {
 659         if (!threading)
 660         {
 661                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 662                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 663         }
 664
 665         /* return our Subversion id for the Log */
 666         return "$Id$";
 667 }