4 * Server-side module for Wiki rooms. This will handle things like version control.
6 * Copyright (c) 2009-2009 by the citadel.org team
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.
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.
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
32 #include <sys/types.h>
34 #if TIME_WITH_SYS_TIME
35 # include <sys/time.h>
39 # include <sys/time.h>
48 #include <libcitadel.h>
51 #include "citserver.h"
60 #include "euidindex.h"
61 #include "ctdl_module.h"
64 * Before allowing a wiki page save to execute, we have to perform version control.
65 * This involves fetching the old version of the page if it exists... FIXME finish this
67 int wiki_upload_beforesave(struct CtdlMessage *msg) {
68 struct CitContext *CCC = CC;
69 long old_msgnum = (-1L);
70 struct CtdlMessage *old_msg = NULL;
71 long history_msgnum = (-1L);
72 struct CtdlMessage *history_msg = NULL;
73 char diff_old_filename[PATH_MAX];
74 char diff_new_filename[PATH_MAX];
75 char diff_cmd[PATH_MAX];
78 char history_page[1024];
82 size_t diffbuf_len = 0;
84 if (!CCC->logged_in) return(0); /* Only do this if logged in. */
86 /* Is this a room with a Wiki in it, don't run this hook. */
87 if (CCC->room.QRdefaultview != VIEW_WIKI) {
91 /* If this isn't a MIME message, don't bother. */
92 if (msg->cm_format_type != 4) return(0);
94 /* If there's no EUID we can't do this. */
95 if (msg->cm_fields['E'] == NULL) return(0);
97 /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
98 if (msg->cm_fields['M'] == NULL) return(0);
100 /* See if we can retrieve the previous version. */
101 old_msgnum = locate_message_by_euid(msg->cm_fields['E'], &CCC->room);
102 if (old_msgnum <= 0L) return(0);
103 snprintf(history_page, sizeof history_page, "%s_HISTORY_", msg->cm_fields['E']);
105 old_msg = CtdlFetchMessage(old_msgnum, 1);
106 if (old_msg == NULL) return(0);
108 if (old_msg->cm_fields['M'] == NULL) { /* old version is corrupt? */
109 CtdlFreeMessage(old_msg);
113 /* If no changes were made, don't bother saving it again */
114 if (!strcmp(msg->cm_fields['M'], old_msg->cm_fields['M'])) {
115 CtdlFreeMessage(old_msg);
122 CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
123 CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
125 fp = fopen(diff_old_filename, "w");
126 rv = fwrite(old_msg->cm_fields['M'], strlen(old_msg->cm_fields['M']), 1, fp);
128 CtdlFreeMessage(old_msg);
130 fp = fopen(diff_new_filename, "w");
131 rv = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
136 snprintf(diff_cmd, sizeof diff_cmd, "diff -u %s %s", diff_old_filename, diff_new_filename);
137 fp = popen(diff_cmd, "r");
140 diffbuf = realloc(diffbuf, diffbuf_len + 1025);
141 nbytes = fread(&diffbuf[diffbuf_len], 1, 1024, fp);
142 diffbuf_len += nbytes;
143 } while (nbytes == 1024);
144 diffbuf[diffbuf_len] = 0;
147 CtdlLogPrintf(CTDL_DEBUG, "diff length is %d bytes\n", diffbuf_len);
149 unlink(diff_old_filename);
150 unlink(diff_new_filename);
152 /* Determine whether this was a bogus (empty) edit */
153 if ((diffbuf_len = 0) && (diffbuf != NULL)) {
157 if (diffbuf == NULL) {
158 return(1); /* No changes at all? Abandon the post entirely! */
161 free(diffbuf); /* FIXME do something with it */
163 /* Now look for the existing edit history */
165 history_msgnum = locate_message_by_euid(history_page, &CCC->room);
167 if (history_msgnum > 0L) {
168 history_msg = CtdlFetchMessage(old_msgnum, 1);
171 /* Create a new history message if necessary */
172 if (history_msg == NULL) {
173 history_msg = malloc(sizeof(struct CtdlMessage));
174 memset(history_msg, 0, sizeof(struct CtdlMessage));
175 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
176 history_msg->cm_anon_type = MES_NORMAL;
177 history_msg->cm_format_type = FMT_RFC822;
178 history_msg->cm_fields['A'] = strdup("Citadel");
179 history_msg->cm_fields['R'] = strdup(CCC->room.QRname);
180 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
181 history_msg->cm_fields['M'] = malloc(1024);
182 snprintf(history_msg->cm_fields['M'], 1024,
183 "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
184 "This is a Citadel wiki history encoded as multipart MIME.\n"
191 /* Update the history message (regardless of whether it's new or existing) */
192 /* FIXME now do something with it */
193 CtdlLogPrintf(CTDL_DEBUG, "\033[31m%s\033[0m", history_msg->cm_fields['M']);
203 * Module initialization
205 CTDL_MODULE_INIT(wiki)
209 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
212 /* return our Subversion id for the Log */