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/**
* @file cdf_channel.c CDF channel parsing
*
* Copyright (C) 2003-2010 Lars Lindner <lars.lindner@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* CDF is evil. There is only one outdated specification of it and its
example is not even well-formed XML! Also, it seems to rely on
things being case insensitive. Some people seem to make the tags
capitalized, while others are like "Channel". */
#include "cdf_channel.h"
#include <sys/time.h>
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include "common.h"
#include "feedlist.h"
#include "cdf_item.h"
#include "metadata.h"
#include "xml.h"
/* note: the tag order has to correspond with the CHANNEL_* defines in the header file */
static GHashTable *channelHash = NULL;
/* method to parse standard tags for the channel element */
static void parseCDFChannel(feedParserCtxtPtr ctxt, xmlNodePtr cur, CDFChannelPtr cp) {
gchar *tmp, *tmp2, *tmp3;
cur = cur->xmlChildrenNode;
while(cur) {
if(!cur->name || cur->type != XML_ELEMENT_NODE) {
cur = cur->next;
continue;
}
if((!xmlStrcasecmp(cur->name, BAD_CAST"logo"))) {
tmp = (gchar *)xmlGetProp(cur, BAD_CAST"HREF");
if(tmp) {
tmp = (gchar *)xmlGetProp(cur, BAD_CAST"href");
metadata_list_set (&ctxt->subscription->metadata, "imageUrl", tmp);
g_free(tmp);
}
} else if((!xmlStrcasecmp(cur->name, BAD_CAST"a"))) {
xmlChar *value = xmlGetProp(cur, BAD_CAST"HREF");
if(value) {
subscription_set_homepage (ctxt->subscription, (gchar *)value);
xmlFree(value);
}
} else if((!xmlStrcasecmp(cur->name, BAD_CAST"item"))) {
ctxt->item = parseCDFItem(ctxt, cur, cp);
if(ctxt->item) {
if(0 == ctxt->item->time)
ctxt->item->time = cp->time;
ctxt->items = g_list_append(ctxt->items, ctxt->item);
}
} else if(!xmlStrcasecmp(cur->name, BAD_CAST "title")) {
tmp = (gchar *)xmlNodeListGetString(cur->doc, cur->xmlChildrenNode, TRUE);
if(tmp) {
tmp = unhtmlize(tmp);
if(ctxt->title)
g_free(ctxt->title);
ctxt->title = tmp;
}
} else if (!xmlStrcasecmp(cur->name, BAD_CAST "abstract")) {
tmp = (gchar *)xmlNodeListGetString (cur->doc, cur->xmlChildrenNode, TRUE);
if (tmp) {
metadata_list_set (&ctxt->subscription->metadata, "description", tmp);
xmlFree (tmp);
}
} else {
tmp = g_ascii_strdown((gchar *)cur->name, -1);
tmp2 = g_hash_table_lookup(channelHash, tmp);
if(tmp2) {
tmp3 = (gchar *)xmlNodeListGetString(cur->doc, cur->xmlChildrenNode, TRUE);
if(tmp3) {
ctxt->subscription->metadata = metadata_list_append(ctxt->subscription->metadata, tmp2, tmp3);
g_free(tmp3);
}
}
g_free(tmp);
}
cur = cur->next;
}
}
/* reads a CDF feed URL and returns a new channel structure (even if
the feed could not be read) */
static void cdf_parse(feedParserCtxtPtr ctxt, xmlNodePtr cur) {
CDFChannelPtr cp;
cp = g_new0(struct CDFChannel, 1);
do {
/* note: we support only one flavour of CDF channels! We will only
support the outer channel of the CDF feed. */
/* find outer channel tag */
while(cur) {
if(cur->type == XML_ELEMENT_NODE && (!xmlStrcasecmp(cur->name, BAD_CAST"channel"))) {
cur = cur->xmlChildrenNode;
break;
}
cur = cur->next;
}
time(&(cp->time));
/* find first "real" channel tag */
while(cur) {
if((!xmlStrcasecmp(cur->name, BAD_CAST"channel"))) {
parseCDFChannel(ctxt, cur, cp);
break;
}
cur = cur->next;
}
/* after parsing we fill in the infos into the subscription structure */
subscription_set_default_update_interval(ctxt->subscription, -1);
g_free(cp);
} while (FALSE);
}
static gboolean cdf_format_check(xmlDocPtr doc, xmlNodePtr cur) {
/* avoid mistaking RSS 1.1 which also uses "Channel" as root tag */
if((NULL != cur->ns) &&
(NULL != cur->ns->href) &&
!xmlStrcmp(cur->ns->href, BAD_CAST"http://purl.org/net/rss1.1#"))
return FALSE;
if(!xmlStrcasecmp(cur->name, BAD_CAST"Channel"))
return TRUE;
return FALSE;
}
/* ---------------------------------------------------------------------------- */
/* initialization */
/* ---------------------------------------------------------------------------- */
#define CDF_CHANNEL_PUBDATE 4
#define CDF_CHANNEL_WEBMASTER 5
#define CDF_CHANNEL_CATEGORY 6
feedHandlerPtr cdf_init_feed_handler(void) {
feedHandlerPtr fhp;
fhp = g_new0(struct feedHandler, 1);
/* there are no name space handlers! */
if (channelHash == NULL) {
channelHash = g_hash_table_new(g_str_hash, g_str_equal);
g_hash_table_insert(channelHash, "copyright", "copyright");
g_hash_table_insert(channelHash, "publicationdate", "lastBuildDate");
g_hash_table_insert(channelHash, "publisher", "managingEditor");
g_hash_table_insert(channelHash, "category", "category");
}
/* prepare feed handler structure */
fhp->typeStr = "cdf";
fhp->feedParser = cdf_parse;
fhp->checkFormat = cdf_format_check;
return fhp;
}
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