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 by the citadel.org team
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (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_cmd[PATH_MAX];
  87         FILE *fp;
  88         int rv;
  89         char history_page[1024];
  90         char boundary[256];
  91         char prefixed_boundary[258];
  92         char buf[1024];
  93         int nbytes = 0;
  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                 CtdlLogPrintf(CTDL_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
 158         if (old_msg != NULL) {
 159                 fp = fopen(diff_old_filename, "w");
 160                 rv = fwrite(old_msg->cm_fields['M'], strlen(old_msg->cm_fields['M']), 1, fp);
 161                 fclose(fp);
 162                 CtdlFreeMessage(old_msg);
 163         }
 164
 165         fp = fopen(diff_new_filename, "w");
 166         rv = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 167         fclose(fp);
 168
 169         diffbuf_len = 0;
 170         diffbuf = NULL;
 171         snprintf(diff_cmd, sizeof diff_cmd,
 172                 "diff -u %s %s",
 173                 diff_new_filename,
 174                 ((old_msg != NULL) ? diff_old_filename : "/dev/null")
 175         );
 176         fp = popen(diff_cmd, "r");
 177         if (fp != NULL) {
 178                 do {
 179                         diffbuf = realloc(diffbuf, diffbuf_len + 1025);
 180                         nbytes = fread(&diffbuf[diffbuf_len], 1, 1024, fp);
 181                         diffbuf_len += nbytes;
 182                 } while (nbytes == 1024);
 183                 diffbuf[diffbuf_len] = 0;
 184                 if (pclose(fp) != 0) {
 185                         CtdlLogPrintf(CTDL_ERR, "pclose() returned an error - diff failed\n");
 186                 }
 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 = CtdlLocateMessageByEuid(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         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 238          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 239          */
 240         if (history_msg->cm_fields['I'] != NULL) {
 241                 free(history_msg->cm_fields['I']);
 242         }
 243
 244         /* Figure out the boundary string.  We do this even when we generated the
 245          * boundary string in the above code, just to be safe and consistent.
 246          */
 247         strcpy(boundary, "");
 248
 249         ptr = history_msg->cm_fields['M'];
 250         do {
 251                 ptr = memreadline(ptr, buf, sizeof buf);
 252                 if (*ptr != 0) {
 253                         striplt(buf);
 254                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 255                                 if (
 256                                         (bmstrcasestr(buf, "multipart") != NULL)
 257                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 258                                 ) {
 259                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 260                                         char *qu;
 261                                         qu = strchr(boundary, '\"');
 262                                         if (qu) {
 263                                                 strcpy(boundary, ++qu);
 264                                         }
 265                                         qu = strchr(boundary, '\"');
 266                                         if (qu) {
 267                                                 *qu = 0;
 268                                         }
 269                                 }
 270                         }
 271                 }
 272         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 273
 274         /* Now look for the first boundary.  That is where we need to insert our fun.
 275          */
 276         if (!IsEmptyStr(boundary)) {
 277                 snprintf(prefixed_boundary, sizeof prefixed_boundary, "--%s", boundary);
 278                 history_msg->cm_fields['M'] = realloc(history_msg->cm_fields['M'],
 279                         strlen(history_msg->cm_fields['M']) + strlen(diffbuf) + 1024
 280                 );
 281                 ptr = bmstrcasestr(history_msg->cm_fields['M'], prefixed_boundary);
 282                 if (ptr != NULL) {
 283                         char *the_rest_of_it = strdup(ptr);
 284                         char uuid[32];
 285                         char memo[512];
 286                         char encoded_memo[768];
 287                         generate_uuid(uuid);
 288                         snprintf(memo, sizeof memo, "%s|%ld|%s|%s",
 289                                 uuid,
 290                                 time(NULL),
 291                                 CCC->user.fullname,
 292                                 config.c_nodename
 293                                 /* no longer logging CCC->cs_inet_email */
 294                         );
 295                         CtdlEncodeBase64(encoded_memo, memo, strlen(memo), 0);
 296                         sprintf(ptr, "--%s\n"
 297                                         "Content-type: text/plain\n"
 298                                         "Content-Disposition: inline; filename=\"%s\"\n"
 299                                         "Content-Transfer-Encoding: 8bit\n"
 300                                         "\n"
 301                                         "%s\n"
 302                                         "%s"
 303                                         ,
 304                                 boundary,
 305                                 encoded_memo,
 306                                 diffbuf,
 307                                 the_rest_of_it
 308                         );
 309                         free(the_rest_of_it);
 310                 }
 311
 312                 history_msg->cm_fields['T'] = realloc(history_msg->cm_fields['T'], 32);
 313                 snprintf(history_msg->cm_fields['T'], 32, "%ld", time(NULL));
 314
 315                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 316         }
 317         else {
 318                 CtdlLogPrintf(CTDL_ALERT, "Empty boundary string in history message.  No history!\n");
 319         }
 320
 321         free(diffbuf);
 322         free(history_msg);
 323         return(0);
 324 }
 325
 326
 327 /*
 328  * MIME Parser callback for wiki_history()
 329  *
 330  * The "filename" field will contain a memo field.  All we have to do is decode
 331  * the base64 and output it.  The data is already in a delimited format suitable
 332  * for our client protocol.
 333  */
 334 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 335                    void *content, char *cbtype, char *cbcharset, size_t length,
 336                    char *encoding, char *cbid, void *cbuserdata)
 337 {
 338         char memo[1024];
 339
 340         CtdlDecodeBase64(memo, filename, strlen(filename));
 341         cprintf("%s\n", memo);
 342 }
 343
 344
 345 /*
 346  * Fetch a list of revisions for a particular wiki page
 347  */
 348 void wiki_history(char *pagename) {
 349         int r;
 350         char history_page_name[270];
 351         long msgnum;
 352         struct CtdlMessage *msg;
 353
 354         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 355         if (r != om_ok) {
 356                 if (r == om_not_logged_in) {
 357                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 358                 }
 359                 else {
 360                         cprintf("%d An unknown error has occurred.\n", ERROR);
 361                 }
 362                 return;
 363         }
 364
 365         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 366         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 367         if (msgnum > 0L) {
 368                 msg = CtdlFetchMessage(msgnum, 1);
 369         }
 370         else {
 371                 msg = NULL;
 372         }
 373
 374         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 375                 CtdlFreeMessage(msg);
 376                 msg = NULL;
 377         }
 378
 379         if (msg == NULL) {
 380                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 381                 return;
 382         }
 383
 384
 385         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 386         mime_parser(msg->cm_fields['M'], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 387         cprintf("000\n");
 388
 389         CtdlFreeMessage(msg);
 390         return;
 391 }
 392
 393 /*
 394  * MIME Parser callback for wiki_rev()
 395  *
 396  * The "filename" field will contain a memo field, which includes (among other things)
 397  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 398  *
 399  * The "content" filed will contain "diff" output suitable for applying via "patch"
 400  * to our temporary file.
 401  */
 402 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 403                    void *content, char *cbtype, char *cbcharset, size_t length,
 404                    char *encoding, char *cbid, void *cbuserdata)
 405 {
 406         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 407         char memo[1024];
 408         char this_rev[256];
 409         FILE *fp;
 410         char *ptr = NULL;
 411         char buf[1024];
 412
 413         /* Did a previous callback already indicate that we've reached our target uuid?
 414          * If so, don't process anything else.
 415          */
 416         if (hecbd->done) {
 417                 return;
 418         }
 419
 420         CtdlDecodeBase64(memo, filename, strlen(filename));
 421         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 422         CtdlLogPrintf(CTDL_DEBUG, "callback found rev: %s\n", this_rev);
 423
 424         /* Perform the patch */
 425         fp = popen("patch -f -s -p0 --global-reject-file=/dev/null >/dev/null 2>/dev/null", "w");
 426         if (fp) {
 427                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 428                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 429                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 430
 431                 ptr = (char *)content;
 432                 int linenum = 0;
 433                 do {
 434                         ++linenum;
 435                         ptr = memreadline(ptr, buf, sizeof buf);
 436                         if (*ptr != 0) {
 437                                 if (linenum <= 2) {
 438                                         /* skip the first two lines; they contain bogus filenames */
 439                                 }
 440                                 else {
 441                                         fprintf(fp, "%s\n", buf);
 442                                 }
 443                         }
 444                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 445                 if (pclose(fp) != 0) {
 446                         CtdlLogPrintf(CTDL_ERR, "pclose() returned an error - patch failed\n");
 447                 }
 448         }
 449
 450         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 451                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 452                 CtdlLogPrintf(CTDL_DEBUG, "Target revision has been reached -- stop patching.\n");
 453                 hecbd->done = 1;
 454         }
 455 }
 456
 457
 458 /*
 459  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 460  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 461  * to revert the currently active page to that revision.
 462  */
 463 void wiki_rev(char *pagename, char *rev, char *operation)
 464 {
 465         int r;
 466         char history_page_name[270];
 467         long msgnum;
 468         char temp[PATH_MAX];
 469         char timestamp[64];
 470         struct CtdlMessage *msg;
 471         FILE *fp;
 472         struct HistoryEraserCallBackData hecbd;
 473         long len = 0L;
 474         int rv;
 475
 476         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 477         if (r != om_ok) {
 478                 if (r == om_not_logged_in) {
 479                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 480                 }
 481                 else {
 482                         cprintf("%d An unknown error has occurred.\n", ERROR);
 483                 }
 484                 return;
 485         }
 486
 487         /* Begin by fetching the current version of the page.  We're going to patch
 488          * backwards through the diffs until we get the one we want.
 489          */
 490         msgnum = CtdlLocateMessageByEuid(pagename, &CC->room);
 491         if (msgnum > 0L) {
 492                 msg = CtdlFetchMessage(msgnum, 1);
 493         }
 494         else {
 495                 msg = NULL;
 496         }
 497
 498         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 499                 CtdlFreeMessage(msg);
 500                 msg = NULL;
 501         }
 502
 503         if (msg == NULL) {
 504                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 505                 return;
 506         }
 507
 508         /* Output it to a temporary file */
 509
 510         CtdlMakeTempFileName(temp, sizeof temp);
 511         fp = fopen(temp, "w");
 512         if (fp != NULL) {
 513                 r = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 514                 fclose(fp);
 515         }
 516         else {
 517                 CtdlLogPrintf(CTDL_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 518         }
 519         CtdlFreeMessage(msg);
 520
 521         /* Get the revision history */
 522
 523         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 524         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 525         if (msgnum > 0L) {
 526                 msg = CtdlFetchMessage(msgnum, 1);
 527         }
 528         else {
 529                 msg = NULL;
 530         }
 531
 532         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 533                 CtdlFreeMessage(msg);
 534                 msg = NULL;
 535         }
 536
 537         if (msg == NULL) {
 538                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 539                 return;
 540         }
 541
 542         /* Start patching backwards (newest to oldest) through the revision history until we
 543          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 544          */
 545
 546         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 547         hecbd.tempfilename = temp;
 548         hecbd.stop_when = rev;
 549
 550         mime_parser(msg->cm_fields['M'], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 551         CtdlFreeMessage(msg);
 552
 553         /* Were we successful? */
 554         if (hecbd.done == 0) {
 555                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 556                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 557                 );
 558         }
 559
 560         /* We have the desired revision on disk.  Now do something with it. */
 561
 562         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 563                 msg = malloc(sizeof(struct CtdlMessage));
 564                 memset(msg, 0, sizeof(struct CtdlMessage));
 565                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 566                 msg->cm_anon_type = MES_NORMAL;
 567                 msg->cm_format_type = FMT_RFC822;
 568                 fp = fopen(temp, "r");
 569                 if (fp) {
 570                         fseek(fp, 0L, SEEK_END);
 571                         len = ftell(fp);
 572                         fseek(fp, 0L, SEEK_SET);
 573                         msg->cm_fields['M'] = malloc(len + 1);
 574                         rv = fread(msg->cm_fields['M'], len, 1, fp);
 575                         CtdlLogPrintf(CTDL_DEBUG, "did %d blocks of %d bytes\n", rv, len);
 576                         msg->cm_fields['M'][len] = 0;
 577                         fclose(fp);
 578                 }
 579                 if (len <= 0) {
 580                         msgnum = (-1L);
 581                 }
 582                 else if (!strcasecmp(operation, "fetch")) {
 583                         msg->cm_fields['A'] = strdup("Citadel");
 584                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 585                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 586                 }
 587                 else if (!strcasecmp(operation, "revert")) {
 588                         snprintf(timestamp, sizeof timestamp, "%ld", time(NULL));
 589                         msg->cm_fields['T'] = strdup(timestamp);
 590                         msg->cm_fields['A'] = strdup(CC->user.fullname);
 591                         msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 592                         msg->cm_fields['O'] = strdup(CC->room.QRname);
 593                         msg->cm_fields['N'] = strdup(NODENAME);
 594                         msg->cm_fields['E'] = strdup(pagename);
 595                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 596                 }
 597                 else {
 598                         /* Theoretically it is impossible to get here, but throw an error anyway */
 599                         msgnum = (-1L);
 600                 }
 601                 CtdlFreeMessage(msg);
 602                 if (msgnum >= 0L) {
 603                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 604                 }
 605                 else {
 606                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 607                 }
 608         }
 609
 610         /* We did all this work for nothing.  Express anguish to the caller. */
 611         else {
 612                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 613         }
 614
 615         unlink(temp);
 616         return;
 617 }
 618
 619
 620
 621 /*
 622  * commands related to wiki management
 623  */
 624 void cmd_wiki(char *argbuf) {
 625         char subcmd[32];
 626         char pagename[256];
 627         char rev[128];
 628         char operation[16];
 629
 630         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 631
 632         if (!strcasecmp(subcmd, "history")) {
 633                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 634                 wiki_history(pagename);
 635                 return;
 636         }
 637
 638         if (!strcasecmp(subcmd, "rev")) {
 639                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 640                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 641                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 642                 wiki_rev(pagename, rev, operation);
 643                 return;
 644         }
 645
 646         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 647 }
 648
 649
 650
 651 /*
 652  * Module initialization
 653  */
 654 CTDL_MODULE_INIT(wiki)
 655 {
 656         if (!threading)
 657         {
 658                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 659                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 660         }
 661
 662         /* return our Subversion id for the Log */
 663         return "wiki";
 664 }