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. */
 112         if (msg->cm_fields['E'] == NULL) return(0);
 113         snprintf(history_page, sizeof history_page, "%s_HISTORY_", msg->cm_fields['E']);
 114
 115         /* Make sure we're saving a real wiki page rather than a wiki history page.
 116          * This is important in order to avoid recursing infinitely into this hook.
 117          */
 118         if (    (strlen(msg->cm_fields['E']) >= 9)
 119                 && (!strcasecmp(&msg->cm_fields['E'][strlen(msg->cm_fields['E'])-9], "_HISTORY_"))
 120         ) {
 121                 CtdlLogPrintf(CTDL_DEBUG, "History page not being historied\n");
 122                 return(0);
 123         }
 124
 125         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 126         if (msg->cm_fields['M'] == NULL) return(0);
 127
 128         /* Set the message subject identical to the page name */
 129         if (msg->cm_fields['U'] != NULL) {
 130                 free(msg->cm_fields['U']);
 131         }
 132         msg->cm_fields['U'] = strdup(msg->cm_fields['E']);
 133
 134         /* See if we can retrieve the previous version. */
 135         old_msgnum = locate_message_by_euid(msg->cm_fields['E'], &CCC->room);
 136         if (old_msgnum > 0L) {
 137                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 138         }
 139         else {
 140                 old_msg = NULL;
 141         }
 142
 143         if ((old_msg != NULL) && (old_msg->cm_fields['M'] == NULL)) {   /* old version is corrupt? */
 144                 CtdlFreeMessage(old_msg);
 145                 old_msg = NULL;
 146         }
 147
 148         /* If no changes were made, don't bother saving it again */
 149         if ((old_msg != NULL) && (!strcmp(msg->cm_fields['M'], old_msg->cm_fields['M']))) {
 150                 CtdlFreeMessage(old_msg);
 151                 return(1);
 152         }
 153
 154         /*
 155          * Generate diffs
 156          */
 157         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 158         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 159
 160         if (old_msg != NULL) {
 161                 fp = fopen(diff_old_filename, "w");
 162                 rv = fwrite(old_msg->cm_fields['M'], strlen(old_msg->cm_fields['M']), 1, fp);
 163                 fclose(fp);
 164                 CtdlFreeMessage(old_msg);
 165         }
 166
 167         fp = fopen(diff_new_filename, "w");
 168         rv = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 169         fclose(fp);
 170
 171         diffbuf_len = 0;
 172         diffbuf = NULL;
 173         snprintf(diff_cmd, sizeof diff_cmd,
 174                 "diff -u %s %s",
 175                 diff_new_filename,
 176                 ((old_msg != NULL) ? diff_old_filename : "/dev/null")
 177         );
 178         fp = popen(diff_cmd, "r");
 179         if (fp != NULL) {
 180                 do {
 181                         diffbuf = realloc(diffbuf, diffbuf_len + 1025);
 182                         nbytes = fread(&diffbuf[diffbuf_len], 1, 1024, fp);
 183                         diffbuf_len += nbytes;
 184                 } while (nbytes == 1024);
 185                 diffbuf[diffbuf_len] = 0;
 186                 pclose(fp);
 187         }
 188         CtdlLogPrintf(CTDL_DEBUG, "diff length is %d bytes\n", diffbuf_len);
 189
 190         unlink(diff_old_filename);
 191         unlink(diff_new_filename);
 192
 193         /* Determine whether this was a bogus (empty) edit */
 194         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 195                 free(diffbuf);
 196                 diffbuf = NULL;
 197         }
 198         if (diffbuf == NULL) {
 199                 return(1);              /* No changes at all?  Abandon the post entirely! */
 200         }
 201
 202         /* Now look for the existing edit history */
 203
 204         history_msgnum = locate_message_by_euid(history_page, &CCC->room);
 205         history_msg = NULL;
 206         if (history_msgnum > 0L) {
 207                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 208         }
 209
 210         /* Create a new history message if necessary */
 211         if (history_msg == NULL) {
 212                 history_msg = malloc(sizeof(struct CtdlMessage));
 213                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 214                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 215                 history_msg->cm_anon_type = MES_NORMAL;
 216                 history_msg->cm_format_type = FMT_RFC822;
 217                 history_msg->cm_fields['A'] = strdup("Citadel");
 218                 history_msg->cm_fields['R'] = strdup(CCC->room.QRname);
 219                 history_msg->cm_fields['E'] = strdup(history_page);
 220                 history_msg->cm_fields['U'] = strdup(history_page);
 221                 history_msg->cm_fields['1'] = strdup("1");              /* suppress full text indexing */
 222                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 223                 history_msg->cm_fields['M'] = malloc(1024);
 224                 snprintf(history_msg->cm_fields['M'], 1024,
 225                         "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 226                         "This is a Citadel wiki history encoded as multipart MIME.\n"
 227                         "Each part is comprised of a diff script representing one change set.\n"
 228                         "\n"
 229                         "--%s--\n"
 230                         ,
 231                         boundary, boundary
 232                 );
 233         }
 234
 235         /* Update the history message (regardless of whether it's new or existing) */
 236
 237         /* First, figure out the boundary string.  We do this even when we generated the
 238          * boundary string in the above code, just to be safe and consistent.
 239          */
 240         strcpy(boundary, "");
 241
 242         ptr = history_msg->cm_fields['M'];
 243         do {
 244                 ptr = memreadline(ptr, buf, sizeof buf);
 245                 if (*ptr != 0) {
 246                         striplt(buf);
 247                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 248                                 if (
 249                                         (bmstrcasestr(buf, "multipart") != NULL)
 250                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 251                                 ) {
 252                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 253                                         char *qu;
 254                                         qu = strchr(boundary, '\"');
 255                                         if (qu) {
 256                                                 strcpy(boundary, ++qu);
 257                                         }
 258                                         qu = strchr(boundary, '\"');
 259                                         if (qu) {
 260                                                 *qu = 0;
 261                                         }
 262                                 }
 263                         }
 264                 }
 265         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 266
 267         /* Now look for the first boundary.  That is where we need to insert our fun.
 268          */
 269         if (!IsEmptyStr(boundary)) {
 270                 snprintf(prefixed_boundary, sizeof prefixed_boundary, "--%s", boundary);
 271                 history_msg->cm_fields['M'] = realloc(history_msg->cm_fields['M'],
 272                         strlen(history_msg->cm_fields['M']) + strlen(diffbuf) + 1024
 273                 );
 274                 ptr = bmstrcasestr(history_msg->cm_fields['M'], prefixed_boundary);
 275                 if (ptr != NULL) {
 276                         char *the_rest_of_it = strdup(ptr);
 277                         char uuid[32];
 278                         char memo[512];
 279                         char encoded_memo[768];
 280                         generate_uuid(uuid);
 281                         snprintf(memo, sizeof memo, "%s|%ld|%s|%s",
 282                                 uuid,
 283                                 time(NULL),
 284                                 CCC->user.fullname,
 285                                 config.c_nodename
 286                                 /* no longer logging CCC->cs_inet_email */
 287                         );
 288                         CtdlEncodeBase64(encoded_memo, memo, strlen(memo), 0);
 289                         sprintf(ptr, "--%s\n"
 290                                         "Content-type: text/plain\n"
 291                                         "Content-Disposition: inline; filename=\"%s\"\n"
 292                                         "Content-Transfer-Encoding: 8bit\n"
 293                                         "\n"
 294                                         "%s\n"
 295                                         "%s"
 296                                         ,
 297                                 boundary,
 298                                 encoded_memo,
 299                                 diffbuf,
 300                                 the_rest_of_it
 301                         );
 302                         free(the_rest_of_it);
 303                 }
 304
 305                 history_msg->cm_fields['T'] = realloc(history_msg->cm_fields['T'], 32);
 306                 snprintf(history_msg->cm_fields['T'], 32, "%ld", time(NULL));
 307
 308                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 309         }
 310         else {
 311                 CtdlLogPrintf(CTDL_ALERT, "Empty boundary string in history message.  No history!\n");
 312         }
 313
 314         free(diffbuf);
 315         free(history_msg);
 316         return(0);
 317 }
 318
 319
 320 /*
 321  * MIME Parser callback for wiki_history()
 322  *
 323  * The "filename" field will contain a memo field.  All we have to do is decode
 324  * the base64 and output it.  The data is already in a delimited format suitable
 325  * for our client protocol.
 326  */
 327 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 328                    void *content, char *cbtype, char *cbcharset, size_t length,
 329                    char *encoding, char *cbid, void *cbuserdata)
 330 {
 331         char memo[1024];
 332
 333         CtdlDecodeBase64(memo, filename, strlen(filename));
 334         cprintf("%s\n", memo);
 335 }
 336
 337
 338 /*
 339  * Fetch a list of revisions for a particular wiki page
 340  */
 341 void wiki_history(char *pagename) {
 342         int r;
 343         char history_page_name[270];
 344         long msgnum;
 345         struct CtdlMessage *msg;
 346
 347         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 348         if (r != om_ok) {
 349                 if (r == om_not_logged_in) {
 350                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 351                 }
 352                 else {
 353                         cprintf("%d An unknown error has occurred.\n", ERROR);
 354                 }
 355                 return;
 356         }
 357
 358         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 359         msgnum = locate_message_by_euid(history_page_name, &CC->room);
 360         if (msgnum > 0L) {
 361                 msg = CtdlFetchMessage(msgnum, 1);
 362         }
 363         else {
 364                 msg = NULL;
 365         }
 366
 367         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 368                 CtdlFreeMessage(msg);
 369                 msg = NULL;
 370         }
 371
 372         if (msg == NULL) {
 373                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 374                 return;
 375         }
 376
 377
 378         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 379         mime_parser(msg->cm_fields['M'], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 380         cprintf("000\n");
 381
 382         CtdlFreeMessage(msg);
 383         return;
 384 }
 385
 386 /*
 387  * MIME Parser callback for wiki_rev()
 388  *
 389  * The "filename" field will contain a memo field, which includes (among other things)
 390  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 391  *
 392  * The "content" filed will contain "diff" output suitable for applying via "patch"
 393  * to our temporary file.
 394  */
 395 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 396                    void *content, char *cbtype, char *cbcharset, size_t length,
 397                    char *encoding, char *cbid, void *cbuserdata)
 398 {
 399         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 400         char memo[1024];
 401         char this_rev[256];
 402         FILE *fp;
 403         char *ptr = NULL;
 404         char buf[1024];
 405
 406         /* Did a previous callback already indicate that we've reached our target uuid?
 407          * If so, don't process anything else.
 408          */
 409         if (hecbd->done) {
 410                 return;
 411         }
 412
 413         CtdlDecodeBase64(memo, filename, strlen(filename));
 414         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 415         CtdlLogPrintf(CTDL_DEBUG, "callback found rev: %s\n", this_rev);
 416
 417         /* Perform the patch */
 418         fp = popen("patch -f -s -p0 >/dev/null 2>/dev/null", "w");
 419         if (fp) {
 420                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 421                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 422                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 423
 424                 ptr = (char *)content;
 425                 int linenum = 0;
 426                 do {
 427                         ++linenum;
 428                         ptr = memreadline(ptr, buf, sizeof buf);
 429                         if (*ptr != 0) {
 430                                 if (linenum <= 2) {
 431                                         /* skip the first two lines; they contain bogus filenames */
 432                                 }
 433                                 else {
 434                                         fprintf(fp, "%s\n", buf);
 435                                 }
 436                         }
 437                 } while ((*ptr != 0) && ((int)ptr < ((int)content + length)));
 438                 pclose(fp);
 439         }
 440
 441         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 442                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 443                 CtdlLogPrintf(CTDL_DEBUG, "Target revision has been reached -- stop patching.\n");
 444                 hecbd->done = 1;
 445         }
 446 }
 447
 448
 449 /*
 450  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 451  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 452  * to revert the currently active page to that revision.
 453  */
 454 void wiki_rev(char *pagename, char *rev, char *operation)
 455 {
 456         int r;
 457         char history_page_name[270];
 458         long msgnum;
 459         char temp[PATH_MAX];
 460         char timestamp[64];
 461         struct CtdlMessage *msg;
 462         FILE *fp;
 463         struct HistoryEraserCallBackData hecbd;
 464         long len = 0L;
 465         int rv;
 466
 467         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 468         if (r != om_ok) {
 469                 if (r == om_not_logged_in) {
 470                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 471                 }
 472                 else {
 473                         cprintf("%d An unknown error has occurred.\n", ERROR);
 474                 }
 475                 return;
 476         }
 477
 478         /* Begin by fetching the current version of the page.  We're going to patch
 479          * backwards through the diffs until we get the one we want.
 480          */
 481         msgnum = locate_message_by_euid(pagename, &CC->room);
 482         if (msgnum > 0L) {
 483                 msg = CtdlFetchMessage(msgnum, 1);
 484         }
 485         else {
 486                 msg = NULL;
 487         }
 488
 489         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 490                 CtdlFreeMessage(msg);
 491                 msg = NULL;
 492         }
 493
 494         if (msg == NULL) {
 495                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 496                 return;
 497         }
 498
 499         /* Output it to a temporary file */
 500
 501         CtdlMakeTempFileName(temp, sizeof temp);
 502         fp = fopen(temp, "w");
 503         if (fp != NULL) {
 504                 r = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 505                 fclose(fp);
 506         }
 507         else {
 508                 CtdlLogPrintf(CTDL_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 509         }
 510         CtdlFreeMessage(msg);
 511
 512         /* Get the revision history */
 513
 514         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 515         msgnum = locate_message_by_euid(history_page_name, &CC->room);
 516         if (msgnum > 0L) {
 517                 msg = CtdlFetchMessage(msgnum, 1);
 518         }
 519         else {
 520                 msg = NULL;
 521         }
 522
 523         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 524                 CtdlFreeMessage(msg);
 525                 msg = NULL;
 526         }
 527
 528         if (msg == NULL) {
 529                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 530                 return;
 531         }
 532
 533         /* Start patching backwards (newest to oldest) through the revision history until we
 534          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 535          */
 536
 537         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 538         hecbd.tempfilename = temp;
 539         hecbd.stop_when = rev;
 540
 541         mime_parser(msg->cm_fields['M'], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 542         CtdlFreeMessage(msg);
 543
 544         /* Were we successful? */
 545         if (hecbd.done == 0) {
 546                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 547                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 548                 );
 549         }
 550
 551         /* We have the desired revision on disk.  Now do something with it. */
 552
 553         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 554                 msg = malloc(sizeof(struct CtdlMessage));
 555                 memset(msg, 0, sizeof(struct CtdlMessage));
 556                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 557                 msg->cm_anon_type = MES_NORMAL;
 558                 msg->cm_format_type = FMT_RFC822;
 559                 fp = fopen(temp, "r");
 560                 if (fp) {
 561                         fseek(fp, 0L, SEEK_END);
 562                         len = ftell(fp);
 563                         fseek(fp, 0L, SEEK_SET);
 564                         msg->cm_fields['M'] = malloc(len + 1);
 565                         rv = fread(msg->cm_fields['M'], len, 1, fp);
 566                         CtdlLogPrintf(CTDL_DEBUG, "\033[32mdid %d blocks of %d bytes\033[0m\n", rv, len);
 567                         msg->cm_fields['M'][len] = 0;
 568                         fclose(fp);
 569                 }
 570                 if (len <= 0) {
 571                         msgnum = (-1L);
 572                 }
 573                 else if (!strcasecmp(operation, "fetch")) {
 574                         msg->cm_fields['A'] = strdup("Citadel");
 575                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 576                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 577                 }
 578                 else if (!strcasecmp(operation, "revert")) {
 579                         snprintf(timestamp, sizeof timestamp, "%ld", time(NULL));
 580                         msg->cm_fields['T'] = strdup(timestamp);
 581                         msg->cm_fields['A'] = strdup(CC->user.fullname);
 582                         msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 583                         msg->cm_fields['O'] = strdup(CC->room.QRname);
 584                         msg->cm_fields['N'] = strdup(NODENAME);
 585                         msg->cm_fields['E'] = strdup(pagename);
 586                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 587                 }
 588                 else {
 589                         /* Theoretically it is impossible to get here, but throw an error anyway */
 590                         msgnum = (-1L);
 591                 }
 592                 CtdlFreeMessage(msg);
 593                 if (msgnum >= 0L) {
 594                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 595                 }
 596                 else {
 597                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 598                 }
 599         }
 600
 601         /* We did all this work for nothing.  Express anguish to the caller. */
 602         else {
 603                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 604         }
 605
 606         unlink(temp);
 607         return;
 608 }
 609
 610
 611
 612 /*
 613  * commands related to wiki management
 614  */
 615 void cmd_wiki(char *argbuf) {
 616         char subcmd[32];
 617         char pagename[256];
 618         char rev[128];
 619         char operation[16];
 620
 621         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 622
 623         if (!strcasecmp(subcmd, "history")) {
 624                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 625                 wiki_history(pagename);
 626                 return;
 627         }
 628
 629         if (!strcasecmp(subcmd, "rev")) {
 630                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 631                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 632                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 633                 wiki_rev(pagename, rev, operation);
 634                 return;
 635         }
 636
 637         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 638 }
 639
 640
 641
 642 /*
 643  * Module initialization
 644  */
 645 CTDL_MODULE_INIT(wiki)
 646 {
 647         if (!threading)
 648         {
 649                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 650                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 651         }
 652
 653         /* return our Subversion id for the Log */
 654         return "$Id$";
 655 }