webcit/feed_generator.c

   1 /*
   2  * RSS feed generator (could be adapted in the future to feed both RSS and Atom)
   3  *
   4  * Copyright (c) 2010-2011 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 "webcit.h"
  22 #include "webserver.h"
  23
  24
  25 /*
  26  * RSS feed generator -- do one message
  27  */
  28 void feed_rss_one_message(long msgnum) {
  29         char buf[1024];
  30         int in_body = 0;
  31         int in_messagetext = 0;
  32         int found_title = 0;
  33         char pubdate[128];
  34         StrBuf *messagetext = NULL;
  35
  36         /* FIXME if this is a blog room we only want to include top-level messages */
  37
  38         serv_printf("MSG4 %ld", msgnum);
  39         serv_getln(buf, sizeof buf);
  40         if (buf[0] != '1') return;
  41
  42         wc_printf("<item>");
  43         wc_printf("<link>%s/readfwd?go=", ChrPtr(site_prefix));
  44         urlescputs(ChrPtr(WC->CurRoom.name));
  45         wc_printf("?start_reading_at=%ld</link>", msgnum);
  46
  47         while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
  48                 if (in_body) {
  49                         if (in_messagetext) {
  50                                 StrBufAppendBufPlain(messagetext, buf, -1, 0);
  51                                 StrBufAppendBufPlain(messagetext, HKEY("\r\n"), 0);
  52                         }
  53                         else if (IsEmptyStr(buf)) {
  54                                 in_messagetext = 1;
  55                         }
  56                 }
  57                 else if (!strncasecmp(buf, "subj=", 5)) {
  58                         wc_printf("<title>");
  59                         escputs(&buf[5]);
  60                         wc_printf("</title>");
  61                         ++found_title;
  62                 }
  63                 else if (!strncasecmp(buf, "exti=", 5)) {
  64                         wc_printf("<guid>");
  65                         escputs(&buf[5]);
  66                         wc_printf("</guid>");
  67                 }
  68                 else if (!strncasecmp(buf, "time=", 5)) {
  69                         http_datestring(pubdate, sizeof pubdate, atol(&buf[5]));
  70                         wc_printf("<pubDate>%s</pubDate>", pubdate);
  71                 }
  72                 else if (!strncasecmp(buf, "text", 4)) {
  73                         if (!found_title) {
  74                                 wc_printf("<title>Message #%ld</title>", msgnum);
  75                         }
  76                         wc_printf("<description>");
  77                         in_body = 1;
  78                         messagetext = NewStrBuf();
  79                 }
  80         }
  81
  82         if (in_body) {
  83                 cdataout((char*)ChrPtr(messagetext));
  84                 FreeStrBuf(&messagetext);
  85                 wc_printf("</description>");
  86         }
  87
  88         wc_printf("</item>");
  89 }
  90
  91 /*
  92  * RSS feed generator -- go through the message list
  93  */
  94 void feed_rss_do_messages(void) {
  95         wcsession *WCC = WC;
  96         int num_msgs = 0;
  97         int i;
  98         SharedMessageStatus Stat;
  99         message_summary *Msg = NULL;
 100
 101         memset(&Stat, 0, sizeof Stat);
 102         Stat.maxload = INT_MAX;
 103         Stat.lowest_found = (-1);
 104         Stat.highest_found = (-1);
 105         num_msgs = load_msg_ptrs("MSGS ALL", &Stat, NULL);
 106         if (num_msgs < 1) return;
 107
 108         i = num_msgs;                                   /* convention is to feed newest-to-oldest */
 109         while (i > 0) {
 110                 Msg = GetMessagePtrAt(i-1, WCC->summ);
 111                 if (Msg != NULL) {
 112                         feed_rss_one_message(Msg->msgnum);
 113                 }
 114                 --i;
 115         }
 116 }
 117
 118
 119 /*
 120  * Entry point for RSS feed generator
 121  */
 122 void feed_rss(void) {
 123         char buf[1024];
 124
 125         output_headers(0, 0, 0, 0, 1, 0);
 126         hprintf("Content-type: text/xml\r\n");
 127         hprintf(
 128                 "Server: %s / %s\r\n"
 129                 "Connection: close\r\n"
 130         ,
 131                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 132         );
 133         begin_burst();
 134
 135         wc_printf("<?xml version=\"1.0\"?>"
 136                 "<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">"
 137                 "<channel>"
 138         );
 139
 140         wc_printf("<title>");
 141         escputs(ChrPtr(WC->CurRoom.name));
 142         wc_printf("</title>");
 143
 144         wc_printf("<link>");
 145         urlescputs(ChrPtr(site_prefix));
 146         wc_printf("</link>");
 147
 148         serv_puts("RINF");
 149         serv_getln(buf, sizeof buf);
 150         if (buf[0] == '1') {
 151                 wc_printf("<description>\r\n");
 152                 while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
 153                         escputs(buf);
 154                         wc_printf("\r\n");
 155                 }
 156                 wc_printf("</description>");
 157         }
 158
 159         wc_printf("<image><title>");
 160         escputs(ChrPtr(WC->CurRoom.name));
 161         wc_printf("</title><url>");
 162         urlescputs(ChrPtr(site_prefix));
 163         wc_printf("/image?name=_roompic_?go=");
 164         urlescputs(ChrPtr(WC->CurRoom.name));
 165         wc_printf("</url><link>");
 166         urlescputs(ChrPtr(site_prefix));
 167         wc_printf("</link></image>\r\n");
 168
 169         feed_rss_do_messages();
 170
 171         wc_printf("</channel>"
 172                 "</rss>"
 173                 "\r\n\r\n"
 174         );
 175
 176         wDumpContent(0);
 177 }
 178
 179
 180 /*
 181  * Offer the RSS feed meta tag for this room
 182  */
 183 void tmplput_rssmeta(StrBuf *Target, WCTemplputParams *TP)
 184 {
 185         wcsession *WCC = WC;
 186         char feed_link[1024];
 187         char encoded_link[1024];
 188
 189         strcpy(feed_link, "/feed_rss?go=");
 190         urlesc(&feed_link[20], sizeof(feed_link) - 20, (char *)ChrPtr(WCC->CurRoom.name) );
 191         CtdlEncodeBase64(encoded_link, feed_link, strlen(feed_link), 0);
 192
 193         StrBufAppendPrintf(Target,
 194                 "<link rel=\"alternate\" title=\"RSS\" href=\"/B64%s\" type=\"application/rss+xml\">",
 195                 encoded_link
 196         );
 197 }
 198
 199
 200 /*
 201  * Offer the RSS feed button for this room
 202  */
 203 void tmplput_rssbutton(StrBuf *Target, WCTemplputParams *TP)
 204 {
 205         wcsession *WCC = WC;
 206         char feed_link[1024];
 207         char encoded_link[1024];
 208
 209         strcpy(feed_link, "/feed_rss?go=");
 210         urlesc(&feed_link[20], sizeof(feed_link) - 20, (char *)ChrPtr(WCC->CurRoom.name) );
 211         CtdlEncodeBase64(encoded_link, feed_link, strlen(feed_link), 0);
 212
 213         StrBufAppendPrintf(Target, "<a type=\"application/rss+xml\" href=\"/B64%s\">", encoded_link);
 214         StrBufAppendPrintf(Target, "<img border=\"0\" src=\"static/rss_16x.png\" alt=\"RSS\">");
 215         StrBufAppendPrintf(Target, "</a>");
 216 }
 217
 218
 219 void
 220 InitModule_RSS
 221 (void)
 222 {
 223         WebcitAddUrlHandler(HKEY("feed_rss"), "", 0, feed_rss, ANONYMOUS|COOKIEUNNEEDED);
 224         RegisterNamespace("THISROOM:FEED:RSS", 0, 0, tmplput_rssbutton, NULL, CTX_NONE);
 225         RegisterNamespace("THISROOM:FEED:RSSMETA", 0, 0, tmplput_rssmeta, NULL, CTX_NONE);
 226 }