webcit/feed_generator.c

   1 /*
   2  * RSS/Atom feed generator
   3  *
   4  * Copyright (c) 2010 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 "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 found_title = 0;
  32         char pubdate[128];
  33
  34         serv_printf("MSG0 %ld", msgnum);                /* FIXME we want msg4 eventually */
  35         serv_getln(buf, sizeof buf);
  36         if (buf[0] != '1') return;
  37
  38         wc_printf("<item>");
  39         wc_printf("<link>%s/readfwd?gotofirst=", ChrPtr(site_prefix));
  40         urlescputs(ChrPtr(WC->CurRoom.name));
  41         wc_printf("?start_reading_at=%ld</link>", msgnum);
  42
  43         while (serv_getln(buf, sizeof buf), strcmp(buf, "000")) {
  44                 if (in_body) {
  45                         escputs(buf);
  46                 }
  47                 else if (!strncasecmp(buf, "subj=", 5)) {
  48                         wc_printf("<title>");
  49                         escputs(&buf[5]);
  50                         wc_printf("</title>");
  51                         ++found_title;
  52                 }
  53                 else if (!strncasecmp(buf, "exti=", 5)) {
  54                         wc_printf("<guid>");
  55                         escputs(&buf[5]);
  56                         wc_printf("</guid>");
  57                 }
  58                 else if (!strncasecmp(buf, "time=", 5)) {
  59                         http_datestring(pubdate, sizeof pubdate, atol(&buf[5]));
  60                         wc_printf("<pubDate>%s</pubDate>", pubdate);
  61                 }
  62                 else if (!strncasecmp(buf, "text", 4)) {
  63                         if (!found_title) {
  64                                 wc_printf("<title>Message #%ld</title>", msgnum);
  65                         }
  66                         wc_printf("<description>");
  67                         in_body = 1;
  68                 }
  69         }
  70
  71         if (in_body) {
  72                 wc_printf("</description>");
  73         }
  74
  75         wc_printf("</item>");
  76 }
  77
  78 /*
  79  * RSS feed generator -- go through the message list
  80  */
  81 void feed_rss_do_messages(void) {
  82         char buf[1024];
  83         long *msgs = NULL;
  84         int num_msgs = 0;
  85         int num_msgs_alloc = 0;
  86         int i;
  87
  88         serv_puts("MSGP text/html|text/plain");         /* identify our preferred mime types */
  89         serv_getln(buf, sizeof buf);                    /* don't care about the result */
  90
  91         serv_puts("MSGS ALL");                          /* ask for all messages in the room */
  92         serv_getln(buf, sizeof buf);
  93         if (buf[0] != '1') return;
  94
  95         while (serv_getln(buf, sizeof buf), strcmp(buf, "000"))
  96         {
  97                 if (num_msgs >= num_msgs_alloc) {
  98                         num_msgs_alloc += 1024;
  99                         msgs = realloc(msgs, num_msgs_alloc*sizeof(long) );
 100                 }
 101                 msgs[num_msgs++] = atol(buf);
 102         }
 103
 104         i = num_msgs;                                   /* convention is to feed newest-to-oldest */
 105         while (i > 0) {
 106                 feed_rss_one_message(msgs[i-1]);
 107                 --i;
 108         }
 109
 110         free(msgs);
 111
 112 }
 113
 114 /*
 115  * Entry point for RSS feed generator
 116  */
 117 void feed_rss(void) {
 118
 119         output_headers(0, 0, 0, 1, 1, 0);
 120         hprintf("Content-type: text/xml\r\n");
 121         hprintf(
 122                 "Server: %s / %s\r\n"
 123                 "Connection: close\r\n"
 124         ,
 125                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 126         );
 127         begin_burst();
 128
 129         wc_printf("<?xml version=\"1.0\"?>"
 130                 "<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\">"
 131                 "<channel>"
 132         );
 133
 134         wc_printf("<title>");
 135         escputs(ChrPtr(WC->CurRoom.name));
 136         wc_printf("</title>");
 137
 138         wc_printf("<link>");
 139         urlescputs(ChrPtr(site_prefix));
 140         wc_printf("</link>");
 141
 142         //      <language>en-us</language>
 143         //      <description>Linux Today News Service</description>
 144         //      <atom:link href="http://linuxtoday.com/biglt.rss" rel="self" type="application/rss+xml" />
 145
 146         //    <image>
 147         //      <title>Linux Today</title>
 148         //      <url>http://linuxtoday.com/pics/ltnet.png</url>
 149         //      <link>http://linuxtoday.com</link>
 150         //    </image>
 151
 152         feed_rss_do_messages();
 153
 154         wc_printf("</channel>"
 155                 "</rss>"
 156                 "\r\n\r\n"
 157         );
 158
 159         wDumpContent(0);
 160         end_webcit_session();
 161 }
 162
 163
 164 void
 165 InitModule_RSS
 166 (void)
 167 {
 168         WebcitAddUrlHandler(HKEY("feed_rss"), "", 0, feed_rss, ANONYMOUS|COOKIEUNNEEDED|FORCE_SESSIONCLOSE);
 169 }