citadel/modules/wiki/serv_wiki.c

   1 /*
   2  * Server-side module for Wiki rooms.  This handles things like version control.
   3  *
   4  * Copyright (c) 2009-2011 by the citadel.org team
   5  *
   6  * This program is open source software.  You can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 3 of the
   9  * License, or (at your option) any later version.
  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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #include "sysdep.h"
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <pwd.h>
  28 #include <errno.h>
  29 #include <ctype.h>
  30 #include <sys/types.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42
  43 #include <sys/wait.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <libcitadel.h>
  47 #include "citadel.h"
  48 #include "server.h"
  49 #include "citserver.h"
  50 #include "support.h"
  51 #include "config.h"
  52 #include "control.h"
  53 #include "user_ops.h"
  54 #include "database.h"
  55 #include "msgbase.h"
  56 #include "euidindex.h"
  57 #include "ctdl_module.h"
  58
  59 /*
  60  * Data passed back and forth between wiki_rev() and its MIME parser callback
  61  */
  62 struct HistoryEraserCallBackData {
  63         char *tempfilename;             /* name of temp file being patched */
  64         char *stop_when;                /* stop when we hit this uuid */
  65         int done;                       /* set to nonzero when we're done patching */
  66 };
  67
  68 /*
  69  * Name of the temporary room we create to store old revisions when someone requests them.
  70  * We put it in an invalid namespace so the DAP cleans up after us later.
  71  */
  72 char *wwm = "9999999999.WikiWaybackMachine";
  73
  74 /*
  75  * Before allowing a wiki page save to execute, we have to perform version control.
  76  * This involves fetching the old version of the page if it exists.
  77  */
  78 int wiki_upload_beforesave(struct CtdlMessage *msg) {
  79         struct CitContext *CCC = CC;
  80         long old_msgnum = (-1L);
  81         struct CtdlMessage *old_msg = NULL;
  82         long history_msgnum = (-1L);
  83         struct CtdlMessage *history_msg = NULL;
  84         char diff_old_filename[PATH_MAX];
  85         char diff_new_filename[PATH_MAX];
  86         char diff_out_filename[PATH_MAX];
  87         char diff_cmd[PATH_MAX];
  88         FILE *fp;
  89         int rv;
  90         char history_page[1024];
  91         char boundary[256];
  92         char prefixed_boundary[258];
  93         char buf[1024];
  94         char *diffbuf = NULL;
  95         size_t diffbuf_len = 0;
  96         char *ptr = NULL;
  97
  98         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
  99
 100         /* Is this a room with a Wiki in it, don't run this hook. */
 101         if (CCC->room.QRdefaultview != VIEW_WIKI) {
 102                 return(0);
 103         }
 104
 105         /* If this isn't a MIME message, don't bother. */
 106         if (msg->cm_format_type != 4) return(0);
 107
 108         /* If there's no EUID we can't do this.  Reject the post. */
 109         if (msg->cm_fields['E'] == NULL) return(1);
 110
 111         snprintf(history_page, sizeof history_page, "%s_HISTORY_", msg->cm_fields['E']);
 112
 113         /* Make sure we're saving a real wiki page rather than a wiki history page.
 114          * This is important in order to avoid recursing infinitely into this hook.
 115          */
 116         if (    (strlen(msg->cm_fields['E']) >= 9)
 117                 && (!strcasecmp(&msg->cm_fields['E'][strlen(msg->cm_fields['E'])-9], "_HISTORY_"))
 118         ) {
 119                 syslog(LOG_DEBUG, "History page not being historied\n");
 120                 return(0);
 121         }
 122
 123         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 124         if (msg->cm_fields['M'] == NULL) return(0);
 125
 126         /* Set the message subject identical to the page name */
 127         if (msg->cm_fields['U'] != NULL) {
 128                 free(msg->cm_fields['U']);
 129         }
 130         msg->cm_fields['U'] = strdup(msg->cm_fields['E']);
 131
 132         /* See if we can retrieve the previous version. */
 133         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields['E'], &CCC->room);
 134         if (old_msgnum > 0L) {
 135                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 136         }
 137         else {
 138                 old_msg = NULL;
 139         }
 140
 141         if ((old_msg != NULL) && (old_msg->cm_fields['M'] == NULL)) {   /* old version is corrupt? */
 142                 CtdlFreeMessage(old_msg);
 143                 old_msg = NULL;
 144         }
 145
 146         /* If no changes were made, don't bother saving it again */
 147         if ((old_msg != NULL) && (!strcmp(msg->cm_fields['M'], old_msg->cm_fields['M']))) {
 148                 CtdlFreeMessage(old_msg);
 149                 return(1);
 150         }
 151
 152         /*
 153          * Generate diffs
 154          */
 155         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 156         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 157         CtdlMakeTempFileName(diff_out_filename, sizeof diff_out_filename);
 158
 159         if (old_msg != NULL) {
 160                 fp = fopen(diff_old_filename, "w");
 161                 rv = fwrite(old_msg->cm_fields['M'], strlen(old_msg->cm_fields['M']), 1, fp);
 162                 fclose(fp);
 163                 CtdlFreeMessage(old_msg);
 164         }
 165
 166         fp = fopen(diff_new_filename, "w");
 167         rv = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 168         fclose(fp);
 169
 170         snprintf(diff_cmd, sizeof diff_cmd,
 171                 DIFF " -u %s %s >%s",
 172                 diff_new_filename,
 173                 ((old_msg != NULL) ? diff_old_filename : "/dev/null"),
 174                 diff_out_filename
 175         );
 176         syslog(LOG_DEBUG, "diff cmd: %s", diff_cmd);
 177         rv = system(diff_cmd);
 178         syslog(LOG_DEBUG, "diff cmd returned %d", rv);
 179
 180         diffbuf_len = 0;
 181         diffbuf = NULL;
 182         fp = fopen(diff_out_filename, "r");
 183         if (fp == NULL) {
 184                 fp = fopen("/dev/null", "r");
 185         }
 186         if (fp != NULL) {
 187                 fseek(fp, 0L, SEEK_END);
 188                 diffbuf_len = ftell(fp);
 189                 fseek(fp, 0L, SEEK_SET);
 190                 diffbuf = malloc(diffbuf_len + 1);
 191                 fread(diffbuf, diffbuf_len, 1, fp);
 192                 diffbuf[diffbuf_len] = 0;
 193                 fclose(fp);
 194         }
 195
 196         syslog(LOG_DEBUG, "diff length is "SIZE_T_FMT" bytes", diffbuf_len);
 197
 198         unlink(diff_old_filename);
 199         unlink(diff_new_filename);
 200         unlink(diff_out_filename);
 201
 202         /* Determine whether this was a bogus (empty) edit */
 203         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 204                 free(diffbuf);
 205                 diffbuf = NULL;
 206         }
 207         if (diffbuf == NULL) {
 208                 return(1);              /* No changes at all?  Abandon the post entirely! */
 209         }
 210
 211         /* Now look for the existing edit history */
 212
 213         history_msgnum = CtdlLocateMessageByEuid(history_page, &CCC->room);
 214         history_msg = NULL;
 215         if (history_msgnum > 0L) {
 216                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 217         }
 218
 219         /* Create a new history message if necessary */
 220         if (history_msg == NULL) {
 221                 history_msg = malloc(sizeof(struct CtdlMessage));
 222                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 223                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 224                 history_msg->cm_anon_type = MES_NORMAL;
 225                 history_msg->cm_format_type = FMT_RFC822;
 226                 history_msg->cm_fields['A'] = strdup("Citadel");
 227                 history_msg->cm_fields['R'] = strdup(CCC->room.QRname);
 228                 history_msg->cm_fields['E'] = strdup(history_page);
 229                 history_msg->cm_fields['U'] = strdup(history_page);
 230                 history_msg->cm_fields['1'] = strdup("1");              /* suppress full text indexing */
 231                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 232                 history_msg->cm_fields['M'] = malloc(1024);
 233                 snprintf(history_msg->cm_fields['M'], 1024,
 234                         "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 235                         "This is a Citadel wiki history encoded as multipart MIME.\n"
 236                         "Each part is comprised of a diff script representing one change set.\n"
 237                         "\n"
 238                         "--%s--\n"
 239                         ,
 240                         boundary, boundary
 241                 );
 242         }
 243
 244         /* Update the history message (regardless of whether it's new or existing) */
 245
 246         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 247          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 248          */
 249         if (history_msg->cm_fields['I'] != NULL) {
 250                 free(history_msg->cm_fields['I']);
 251                 history_msg->cm_fields['I'] = NULL;
 252         }
 253
 254         /* Figure out the boundary string.  We do this even when we generated the
 255          * boundary string in the above code, just to be safe and consistent.
 256          */
 257         strcpy(boundary, "");
 258
 259         ptr = history_msg->cm_fields['M'];
 260         do {
 261                 ptr = memreadline(ptr, buf, sizeof buf);
 262                 if (*ptr != 0) {
 263                         striplt(buf);
 264                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 265                                 if (
 266                                         (bmstrcasestr(buf, "multipart") != NULL)
 267                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 268                                 ) {
 269                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 270                                         char *qu;
 271                                         qu = strchr(boundary, '\"');
 272                                         if (qu) {
 273                                                 strcpy(boundary, ++qu);
 274                                         }
 275                                         qu = strchr(boundary, '\"');
 276                                         if (qu) {
 277                                                 *qu = 0;
 278                                         }
 279                                 }
 280                         }
 281                 }
 282         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 283
 284         /*
 285          * Now look for the first boundary.  That is where we need to insert our fun.
 286          */
 287         if (!IsEmptyStr(boundary)) {
 288                 snprintf(prefixed_boundary, sizeof prefixed_boundary, "--%s", boundary);
 289                 history_msg->cm_fields['M'] = realloc(history_msg->cm_fields['M'],
 290                         strlen(history_msg->cm_fields['M']) + strlen(diffbuf) + 1024
 291                 );
 292                 ptr = bmstrcasestr(history_msg->cm_fields['M'], prefixed_boundary);
 293                 if (ptr != NULL) {
 294                         char *the_rest_of_it = strdup(ptr);
 295                         char uuid[64];
 296                         char memo[512];
 297                         char encoded_memo[1024];
 298                         generate_uuid(uuid);
 299                         snprintf(memo, sizeof memo, "%s|%ld|%s|%s",
 300                                 uuid,
 301                                 time(NULL),
 302                                 CCC->user.fullname,
 303                                 config.c_nodename
 304                         );
 305                         CtdlEncodeBase64(encoded_memo, memo, strlen(memo), 0);
 306                         sprintf(ptr, "--%s\n"
 307                                         "Content-type: text/plain\n"
 308                                         "Content-Disposition: inline; filename=\"%s\"\n"
 309                                         "Content-Transfer-Encoding: 8bit\n"
 310                                         "\n"
 311                                         "%s\n"
 312                                         "%s"
 313                                         ,
 314                                 boundary,
 315                                 encoded_memo,
 316                                 diffbuf,
 317                                 the_rest_of_it
 318                         );
 319                         free(the_rest_of_it);
 320                 }
 321
 322                 history_msg->cm_fields['T'] = realloc(history_msg->cm_fields['T'], 32);
 323                 if (history_msg->cm_fields['T'] != NULL) {
 324                         snprintf(history_msg->cm_fields['T'], 32, "%ld", time(NULL));
 325                 }
 326
 327                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 328         }
 329         else {
 330                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 331         }
 332
 333         free(diffbuf);
 334         free(history_msg);
 335         return(0);
 336 }
 337
 338
 339 /*
 340  * MIME Parser callback for wiki_history()
 341  *
 342  * The "filename" field will contain a memo field.  All we have to do is decode
 343  * the base64 and output it.  The data is already in a delimited format suitable
 344  * for our client protocol.
 345  */
 346 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 347                    void *content, char *cbtype, char *cbcharset, size_t length,
 348                    char *encoding, char *cbid, void *cbuserdata)
 349 {
 350         char memo[1024];
 351
 352         CtdlDecodeBase64(memo, filename, strlen(filename));
 353         cprintf("%s\n", memo);
 354 }
 355
 356
 357 /*
 358  * Fetch a list of revisions for a particular wiki page
 359  */
 360 void wiki_history(char *pagename) {
 361         int r;
 362         char history_page_name[270];
 363         long msgnum;
 364         struct CtdlMessage *msg;
 365
 366         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 367         if (r != om_ok) {
 368                 if (r == om_not_logged_in) {
 369                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 370                 }
 371                 else {
 372                         cprintf("%d An unknown error has occurred.\n", ERROR);
 373                 }
 374                 return;
 375         }
 376
 377         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 378         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 379         if (msgnum > 0L) {
 380                 msg = CtdlFetchMessage(msgnum, 1);
 381         }
 382         else {
 383                 msg = NULL;
 384         }
 385
 386         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 387                 CtdlFreeMessage(msg);
 388                 msg = NULL;
 389         }
 390
 391         if (msg == NULL) {
 392                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 393                 return;
 394         }
 395
 396
 397         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 398         mime_parser(msg->cm_fields['M'], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 399         cprintf("000\n");
 400
 401         CtdlFreeMessage(msg);
 402         return;
 403 }
 404
 405 /*
 406  * MIME Parser callback for wiki_rev()
 407  *
 408  * The "filename" field will contain a memo field, which includes (among other things)
 409  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 410  *
 411  * The "content" filed will contain "diff" output suitable for applying via "patch"
 412  * to our temporary file.
 413  */
 414 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 415                    void *content, char *cbtype, char *cbcharset, size_t length,
 416                    char *encoding, char *cbid, void *cbuserdata)
 417 {
 418         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 419         char memo[1024];
 420         char this_rev[256];
 421         FILE *fp;
 422         char *ptr = NULL;
 423         char buf[1024];
 424
 425         /* Did a previous callback already indicate that we've reached our target uuid?
 426          * If so, don't process anything else.
 427          */
 428         if (hecbd->done) {
 429                 return;
 430         }
 431
 432         CtdlDecodeBase64(memo, filename, strlen(filename));
 433         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 434         syslog(LOG_DEBUG, "callback found rev: %s\n", this_rev);
 435
 436         /* Perform the patch */
 437         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 438         if (fp) {
 439                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 440                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 441                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 442
 443                 ptr = (char *)content;
 444                 int linenum = 0;
 445                 do {
 446                         ++linenum;
 447                         ptr = memreadline(ptr, buf, sizeof buf);
 448                         if (*ptr != 0) {
 449                                 if (linenum <= 2) {
 450                                         /* skip the first two lines; they contain bogus filenames */
 451                                 }
 452                                 else {
 453                                         fprintf(fp, "%s\n", buf);
 454                                 }
 455                         }
 456                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 457                 if (pclose(fp) != 0) {
 458                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 459                 }
 460         }
 461
 462         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 463                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 464                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 465                 hecbd->done = 1;
 466         }
 467 }
 468
 469
 470 /*
 471  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 472  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 473  * to revert the currently active page to that revision.
 474  */
 475 void wiki_rev(char *pagename, char *rev, char *operation)
 476 {
 477         int r;
 478         char history_page_name[270];
 479         long msgnum;
 480         char temp[PATH_MAX];
 481         char timestamp[64];
 482         struct CtdlMessage *msg;
 483         FILE *fp;
 484         struct HistoryEraserCallBackData hecbd;
 485         long len = 0L;
 486         int rv;
 487
 488         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 489         if (r != om_ok) {
 490                 if (r == om_not_logged_in) {
 491                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 492                 }
 493                 else {
 494                         cprintf("%d An unknown error has occurred.\n", ERROR);
 495                 }
 496                 return;
 497         }
 498
 499         if (!strcasecmp(operation, "revert")) {
 500                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 501                 if (r != 0) {
 502                         cprintf("%d %s\n", r, temp);
 503                         return;
 504                 }
 505         }
 506
 507         /* Begin by fetching the current version of the page.  We're going to patch
 508          * backwards through the diffs until we get the one we want.
 509          */
 510         msgnum = CtdlLocateMessageByEuid(pagename, &CC->room);
 511         if (msgnum > 0L) {
 512                 msg = CtdlFetchMessage(msgnum, 1);
 513         }
 514         else {
 515                 msg = NULL;
 516         }
 517
 518         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 519                 CtdlFreeMessage(msg);
 520                 msg = NULL;
 521         }
 522
 523         if (msg == NULL) {
 524                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 525                 return;
 526         }
 527
 528         /* Output it to a temporary file */
 529
 530         CtdlMakeTempFileName(temp, sizeof temp);
 531         fp = fopen(temp, "w");
 532         if (fp != NULL) {
 533                 r = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 534                 fclose(fp);
 535         }
 536         else {
 537                 syslog(LOG_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 538         }
 539         CtdlFreeMessage(msg);
 540
 541         /* Get the revision history */
 542
 543         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 544         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 545         if (msgnum > 0L) {
 546                 msg = CtdlFetchMessage(msgnum, 1);
 547         }
 548         else {
 549                 msg = NULL;
 550         }
 551
 552         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 553                 CtdlFreeMessage(msg);
 554                 msg = NULL;
 555         }
 556
 557         if (msg == NULL) {
 558                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 559                 return;
 560         }
 561
 562         /* Start patching backwards (newest to oldest) through the revision history until we
 563          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 564          */
 565
 566         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 567         hecbd.tempfilename = temp;
 568         hecbd.stop_when = rev;
 569
 570         mime_parser(msg->cm_fields['M'], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 571         CtdlFreeMessage(msg);
 572
 573         /* Were we successful? */
 574         if (hecbd.done == 0) {
 575                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 576                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 577                 );
 578         }
 579
 580         /* We have the desired revision on disk.  Now do something with it. */
 581
 582         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 583                 msg = malloc(sizeof(struct CtdlMessage));
 584                 memset(msg, 0, sizeof(struct CtdlMessage));
 585                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 586                 msg->cm_anon_type = MES_NORMAL;
 587                 msg->cm_format_type = FMT_RFC822;
 588                 fp = fopen(temp, "r");
 589                 if (fp) {
 590                         fseek(fp, 0L, SEEK_END);
 591                         len = ftell(fp);
 592                         fseek(fp, 0L, SEEK_SET);
 593                         msg->cm_fields['M'] = malloc(len + 1);
 594                         rv = fread(msg->cm_fields['M'], len, 1, fp);
 595                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 596                         msg->cm_fields['M'][len] = 0;
 597                         fclose(fp);
 598                 }
 599                 if (len <= 0) {
 600                         msgnum = (-1L);
 601                 }
 602                 else if (!strcasecmp(operation, "fetch")) {
 603                         msg->cm_fields['A'] = strdup("Citadel");
 604                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 605                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 606
 607                         /*
 608                          * WARNING: VILE SLEAZY HACK
 609                          * This will avoid the 'message xxx is not in this room' security error,
 610                          * but only if the client fetches the message we just generated immediately
 611                          * without first trying to perform other fetch operations.
 612                          */
 613                         if (CC->cached_msglist != NULL) {
 614                                 free(CC->cached_msglist);
 615                                 CC->cached_msglist = NULL;
 616                                 CC->cached_num_msgs = 0;
 617                         }
 618                         CC->cached_msglist = malloc(sizeof(long));
 619                         if (CC->cached_msglist != NULL) {
 620                                 CC->cached_num_msgs = 1;
 621                                 CC->cached_msglist[0] = msgnum;
 622                         }
 623
 624                 }
 625                 else if (!strcasecmp(operation, "revert")) {
 626                         snprintf(timestamp, sizeof timestamp, "%ld", time(NULL));
 627                         msg->cm_fields['T'] = strdup(timestamp);
 628                         msg->cm_fields['A'] = strdup(CC->user.fullname);
 629                         msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 630                         msg->cm_fields['O'] = strdup(CC->room.QRname);
 631                         msg->cm_fields['N'] = strdup(NODENAME);
 632                         msg->cm_fields['E'] = strdup(pagename);
 633                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 634                 }
 635                 else {
 636                         /* Theoretically it is impossible to get here, but throw an error anyway */
 637                         msgnum = (-1L);
 638                 }
 639                 CtdlFreeMessage(msg);
 640                 if (msgnum >= 0L) {
 641                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 642                 }
 643                 else {
 644                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 645                 }
 646         }
 647
 648         /* We did all this work for nothing.  Express anguish to the caller. */
 649         else {
 650                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 651         }
 652
 653         unlink(temp);
 654         return;
 655 }
 656
 657
 658
 659 /*
 660  * commands related to wiki management
 661  */
 662 void cmd_wiki(char *argbuf) {
 663         char subcmd[32];
 664         char pagename[256];
 665         char rev[128];
 666         char operation[16];
 667
 668         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 669
 670         if (!strcasecmp(subcmd, "history")) {
 671                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 672                 wiki_history(pagename);
 673                 return;
 674         }
 675
 676         if (!strcasecmp(subcmd, "rev")) {
 677                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 678                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 679                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 680                 wiki_rev(pagename, rev, operation);
 681                 return;
 682         }
 683
 684         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 685 }
 686
 687
 688
 689 /*
 690  * Module initialization
 691  */
 692 CTDL_MODULE_INIT(wiki)
 693 {
 694         if (!threading)
 695         {
 696                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 697                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 698         }
 699
 700         /* return our module name for the log */
 701         return "wiki";
 702 }