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                 if (pclose(fp) != 0) {
 187                         CtdlLogPrintf(CTDL_ERR, "pclose() returned an error - diff failed\n");
 188                 }
 189         }
 190         CtdlLogPrintf(CTDL_DEBUG, "diff length is %d bytes\n", diffbuf_len);
 191
 192         unlink(diff_old_filename);
 193         unlink(diff_new_filename);
 194
 195         /* Determine whether this was a bogus (empty) edit */
 196         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 197                 free(diffbuf);
 198                 diffbuf = NULL;
 199         }
 200         if (diffbuf == NULL) {
 201                 return(1);              /* No changes at all?  Abandon the post entirely! */
 202         }
 203
 204         /* Now look for the existing edit history */
 205
 206         history_msgnum = locate_message_by_euid(history_page, &CCC->room);
 207         history_msg = NULL;
 208         if (history_msgnum > 0L) {
 209                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 210         }
 211
 212         /* Create a new history message if necessary */
 213         if (history_msg == NULL) {
 214                 history_msg = malloc(sizeof(struct CtdlMessage));
 215                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 216                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 217                 history_msg->cm_anon_type = MES_NORMAL;
 218                 history_msg->cm_format_type = FMT_RFC822;
 219                 history_msg->cm_fields['A'] = strdup("Citadel");
 220                 history_msg->cm_fields['R'] = strdup(CCC->room.QRname);
 221                 history_msg->cm_fields['E'] = strdup(history_page);
 222                 history_msg->cm_fields['U'] = strdup(history_page);
 223                 history_msg->cm_fields['1'] = strdup("1");              /* suppress full text indexing */
 224                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 225                 history_msg->cm_fields['M'] = malloc(1024);
 226                 snprintf(history_msg->cm_fields['M'], 1024,
 227                         "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 228                         "This is a Citadel wiki history encoded as multipart MIME.\n"
 229                         "Each part is comprised of a diff script representing one change set.\n"
 230                         "\n"
 231                         "--%s--\n"
 232                         ,
 233                         boundary, boundary
 234                 );
 235         }
 236
 237         /* Update the history message (regardless of whether it's new or existing) */
 238
 239         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 240          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 241          */
 242         if (history_msg->cm_fields['I'] != NULL) {
 243                 free(history_msg->cm_fields['I']);
 244         }
 245
 246         /* Figure out the boundary string.  We do this even when we generated the
 247          * boundary string in the above code, just to be safe and consistent.
 248          */
 249         strcpy(boundary, "");
 250
 251         ptr = history_msg->cm_fields['M'];
 252         do {
 253                 ptr = memreadline(ptr, buf, sizeof buf);
 254                 if (*ptr != 0) {
 255                         striplt(buf);
 256                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 257                                 if (
 258                                         (bmstrcasestr(buf, "multipart") != NULL)
 259                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 260                                 ) {
 261                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 262                                         char *qu;
 263                                         qu = strchr(boundary, '\"');
 264                                         if (qu) {
 265                                                 strcpy(boundary, ++qu);
 266                                         }
 267                                         qu = strchr(boundary, '\"');
 268                                         if (qu) {
 269                                                 *qu = 0;
 270                                         }
 271                                 }
 272                         }
 273                 }
 274         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 275
 276         /* Now look for the first boundary.  That is where we need to insert our fun.
 277          */
 278         if (!IsEmptyStr(boundary)) {
 279                 snprintf(prefixed_boundary, sizeof prefixed_boundary, "--%s", boundary);
 280                 history_msg->cm_fields['M'] = realloc(history_msg->cm_fields['M'],
 281                         strlen(history_msg->cm_fields['M']) + strlen(diffbuf) + 1024
 282                 );
 283                 ptr = bmstrcasestr(history_msg->cm_fields['M'], prefixed_boundary);
 284                 if (ptr != NULL) {
 285                         char *the_rest_of_it = strdup(ptr);
 286                         char uuid[32];
 287                         char memo[512];
 288                         char encoded_memo[768];
 289                         generate_uuid(uuid);
 290                         snprintf(memo, sizeof memo, "%s|%ld|%s|%s",
 291                                 uuid,
 292                                 time(NULL),
 293                                 CCC->user.fullname,
 294                                 config.c_nodename
 295                                 /* no longer logging CCC->cs_inet_email */
 296                         );
 297                         CtdlEncodeBase64(encoded_memo, memo, strlen(memo), 0);
 298                         sprintf(ptr, "--%s\n"
 299                                         "Content-type: text/plain\n"
 300                                         "Content-Disposition: inline; filename=\"%s\"\n"
 301                                         "Content-Transfer-Encoding: 8bit\n"
 302                                         "\n"
 303                                         "%s\n"
 304                                         "%s"
 305                                         ,
 306                                 boundary,
 307                                 encoded_memo,
 308                                 diffbuf,
 309                                 the_rest_of_it
 310                         );
 311                         free(the_rest_of_it);
 312                 }
 313
 314                 history_msg->cm_fields['T'] = realloc(history_msg->cm_fields['T'], 32);
 315                 snprintf(history_msg->cm_fields['T'], 32, "%ld", time(NULL));
 316
 317                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 318         }
 319         else {
 320                 CtdlLogPrintf(CTDL_ALERT, "Empty boundary string in history message.  No history!\n");
 321         }
 322
 323         free(diffbuf);
 324         free(history_msg);
 325         return(0);
 326 }
 327
 328
 329 /*
 330  * MIME Parser callback for wiki_history()
 331  *
 332  * The "filename" field will contain a memo field.  All we have to do is decode
 333  * the base64 and output it.  The data is already in a delimited format suitable
 334  * for our client protocol.
 335  */
 336 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 337                    void *content, char *cbtype, char *cbcharset, size_t length,
 338                    char *encoding, char *cbid, void *cbuserdata)
 339 {
 340         char memo[1024];
 341
 342         CtdlDecodeBase64(memo, filename, strlen(filename));
 343         cprintf("%s\n", memo);
 344 }
 345
 346
 347 /*
 348  * Fetch a list of revisions for a particular wiki page
 349  */
 350 void wiki_history(char *pagename) {
 351         int r;
 352         char history_page_name[270];
 353         long msgnum;
 354         struct CtdlMessage *msg;
 355
 356         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 357         if (r != om_ok) {
 358                 if (r == om_not_logged_in) {
 359                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 360                 }
 361                 else {
 362                         cprintf("%d An unknown error has occurred.\n", ERROR);
 363                 }
 364                 return;
 365         }
 366
 367         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 368         msgnum = locate_message_by_euid(history_page_name, &CC->room);
 369         if (msgnum > 0L) {
 370                 msg = CtdlFetchMessage(msgnum, 1);
 371         }
 372         else {
 373                 msg = NULL;
 374         }
 375
 376         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 377                 CtdlFreeMessage(msg);
 378                 msg = NULL;
 379         }
 380
 381         if (msg == NULL) {
 382                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 383                 return;
 384         }
 385
 386
 387         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 388         mime_parser(msg->cm_fields['M'], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 389         cprintf("000\n");
 390
 391         CtdlFreeMessage(msg);
 392         return;
 393 }
 394
 395 /*
 396  * MIME Parser callback for wiki_rev()
 397  *
 398  * The "filename" field will contain a memo field, which includes (among other things)
 399  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 400  *
 401  * The "content" filed will contain "diff" output suitable for applying via "patch"
 402  * to our temporary file.
 403  */
 404 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 405                    void *content, char *cbtype, char *cbcharset, size_t length,
 406                    char *encoding, char *cbid, void *cbuserdata)
 407 {
 408         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 409         char memo[1024];
 410         char this_rev[256];
 411         FILE *fp;
 412         char *ptr = NULL;
 413         char buf[1024];
 414
 415         /* Did a previous callback already indicate that we've reached our target uuid?
 416          * If so, don't process anything else.
 417          */
 418         if (hecbd->done) {
 419                 return;
 420         }
 421
 422         CtdlDecodeBase64(memo, filename, strlen(filename));
 423         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 424         CtdlLogPrintf(CTDL_DEBUG, "callback found rev: %s\n", this_rev);
 425
 426         /* Perform the patch */
 427         fp = popen("patch -f -s -p0 --global-reject-file=/dev/null >/dev/null 2>/dev/null", "w");
 428         if (fp) {
 429                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 430                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 431                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 432
 433                 ptr = (char *)content;
 434                 int linenum = 0;
 435                 do {
 436                         ++linenum;
 437                         ptr = memreadline(ptr, buf, sizeof buf);
 438                         if (*ptr != 0) {
 439                                 if (linenum <= 2) {
 440                                         /* skip the first two lines; they contain bogus filenames */
 441                                 }
 442                                 else {
 443                                         fprintf(fp, "%s\n", buf);
 444                                 }
 445                         }
 446                 } while ((*ptr != 0) && ((int)ptr < ((int)content + length)));
 447                 if (pclose(fp) != 0) {
 448                         CtdlLogPrintf(CTDL_ERR, "pclose() returned an error - patch failed\n");
 449                 }
 450         }
 451
 452         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 453                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 454                 CtdlLogPrintf(CTDL_DEBUG, "Target revision has been reached -- stop patching.\n");
 455                 hecbd->done = 1;
 456         }
 457 }
 458
 459
 460 /*
 461  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 462  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 463  * to revert the currently active page to that revision.
 464  */
 465 void wiki_rev(char *pagename, char *rev, char *operation)
 466 {
 467         int r;
 468         char history_page_name[270];
 469         long msgnum;
 470         char temp[PATH_MAX];
 471         char timestamp[64];
 472         struct CtdlMessage *msg;
 473         FILE *fp;
 474         struct HistoryEraserCallBackData hecbd;
 475         long len = 0L;
 476         int rv;
 477
 478         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 479         if (r != om_ok) {
 480                 if (r == om_not_logged_in) {
 481                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 482                 }
 483                 else {
 484                         cprintf("%d An unknown error has occurred.\n", ERROR);
 485                 }
 486                 return;
 487         }
 488
 489         /* Begin by fetching the current version of the page.  We're going to patch
 490          * backwards through the diffs until we get the one we want.
 491          */
 492         msgnum = locate_message_by_euid(pagename, &CC->room);
 493         if (msgnum > 0L) {
 494                 msg = CtdlFetchMessage(msgnum, 1);
 495         }
 496         else {
 497                 msg = NULL;
 498         }
 499
 500         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 501                 CtdlFreeMessage(msg);
 502                 msg = NULL;
 503         }
 504
 505         if (msg == NULL) {
 506                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 507                 return;
 508         }
 509
 510         /* Output it to a temporary file */
 511
 512         CtdlMakeTempFileName(temp, sizeof temp);
 513         fp = fopen(temp, "w");
 514         if (fp != NULL) {
 515                 r = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 516                 fclose(fp);
 517         }
 518         else {
 519                 CtdlLogPrintf(CTDL_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 520         }
 521         CtdlFreeMessage(msg);
 522
 523         /* Get the revision history */
 524
 525         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 526         msgnum = locate_message_by_euid(history_page_name, &CC->room);
 527         if (msgnum > 0L) {
 528                 msg = CtdlFetchMessage(msgnum, 1);
 529         }
 530         else {
 531                 msg = NULL;
 532         }
 533
 534         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 535                 CtdlFreeMessage(msg);
 536                 msg = NULL;
 537         }
 538
 539         if (msg == NULL) {
 540                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 541                 return;
 542         }
 543
 544         /* Start patching backwards (newest to oldest) through the revision history until we
 545          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 546          */
 547
 548         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 549         hecbd.tempfilename = temp;
 550         hecbd.stop_when = rev;
 551
 552         mime_parser(msg->cm_fields['M'], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 553         CtdlFreeMessage(msg);
 554
 555         /* Were we successful? */
 556         if (hecbd.done == 0) {
 557                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 558                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 559                 );
 560         }
 561
 562         /* We have the desired revision on disk.  Now do something with it. */
 563
 564         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 565                 msg = malloc(sizeof(struct CtdlMessage));
 566                 memset(msg, 0, sizeof(struct CtdlMessage));
 567                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 568                 msg->cm_anon_type = MES_NORMAL;
 569                 msg->cm_format_type = FMT_RFC822;
 570                 fp = fopen(temp, "r");
 571                 if (fp) {
 572                         fseek(fp, 0L, SEEK_END);
 573                         len = ftell(fp);
 574                         fseek(fp, 0L, SEEK_SET);
 575                         msg->cm_fields['M'] = malloc(len + 1);
 576                         rv = fread(msg->cm_fields['M'], len, 1, fp);
 577                         CtdlLogPrintf(CTDL_DEBUG, "\033[32mdid %d blocks of %d bytes\033[0m\n", rv, len);
 578                         msg->cm_fields['M'][len] = 0;
 579                         fclose(fp);
 580                 }
 581                 if (len <= 0) {
 582                         msgnum = (-1L);
 583                 }
 584                 else if (!strcasecmp(operation, "fetch")) {
 585                         msg->cm_fields['A'] = strdup("Citadel");
 586                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 587                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 588                 }
 589                 else if (!strcasecmp(operation, "revert")) {
 590                         snprintf(timestamp, sizeof timestamp, "%ld", time(NULL));
 591                         msg->cm_fields['T'] = strdup(timestamp);
 592                         msg->cm_fields['A'] = strdup(CC->user.fullname);
 593                         msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 594                         msg->cm_fields['O'] = strdup(CC->room.QRname);
 595                         msg->cm_fields['N'] = strdup(NODENAME);
 596                         msg->cm_fields['E'] = strdup(pagename);
 597                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 598                 }
 599                 else {
 600                         /* Theoretically it is impossible to get here, but throw an error anyway */
 601                         msgnum = (-1L);
 602                 }
 603                 CtdlFreeMessage(msg);
 604                 if (msgnum >= 0L) {
 605                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 606                 }
 607                 else {
 608                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 609                 }
 610         }
 611
 612         /* We did all this work for nothing.  Express anguish to the caller. */
 613         else {
 614                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 615         }
 616
 617         unlink(temp);
 618         return;
 619 }
 620
 621
 622
 623 /*
 624  * commands related to wiki management
 625  */
 626 void cmd_wiki(char *argbuf) {
 627         char subcmd[32];
 628         char pagename[256];
 629         char rev[128];
 630         char operation[16];
 631
 632         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 633
 634         if (!strcasecmp(subcmd, "history")) {
 635                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 636                 wiki_history(pagename);
 637                 return;
 638         }
 639
 640         if (!strcasecmp(subcmd, "rev")) {
 641                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 642                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 643                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 644                 wiki_rev(pagename, rev, operation);
 645                 return;
 646         }
 647
 648         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 649 }
 650
 651
 652
 653 /*
 654  * Module initialization
 655  */
 656 CTDL_MODULE_INIT(wiki)
 657 {
 658         if (!threading)
 659         {
 660                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 661                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 662         }
 663
 664         /* return our Subversion id for the Log */
 665         return "$Id$";
 666 }