344 lines
9 KiB
C
344 lines
9 KiB
C
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/*
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Copyright (C) 2009 Dale Whittaker <dayul@users.sf.net>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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See the file COPYING for the full license text.
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*/
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#include "feed-atom.h"
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#define atom_get_link_attribute(item, attribute) \
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(gchar*)g_object_get_data (G_OBJECT (item), attribute)
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#define atom_set_link_attribute(item, attribute, value) \
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g_object_set_data (G_OBJECT (item), attribute, value)
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static gboolean
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atom_is_valid (FeedParser* fparser)
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{
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xmlNodePtr node;
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node = fparser->node;
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if (!(xmlStrcmp (node->name, BAD_CAST "feed")) &&
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!(xmlStrcmp (node->ns->href, BAD_CAST "http://www.w3.org/2005/Atom"))
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)
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return TRUE;
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return FALSE;
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}
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static gboolean
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atom_update (FeedParser* fparser)
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{
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xmlNodePtr node;
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xmlNodePtr child;
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gint64 date;
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gint64 newdate;
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date = katze_item_get_added (fparser->item);
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node = fparser->node;
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child = node->children;
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while (child)
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{
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if (child->type == XML_ELEMENT_NODE)
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{
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if (!(xmlStrcmp (child->name, BAD_CAST "updated")))
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{
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fparser->node = child;
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newdate = feed_get_element_date (fparser);
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fparser->node = node;
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return (date != newdate);
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}
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}
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child = child->next;
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}
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return TRUE;
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}
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static gboolean
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atom_preferred_link (const gchar* old,
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const gchar* new)
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{
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guint i;
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gint iold;
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gint inew;
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gchar* rels[5] =
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{
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"enclosure",
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"via",
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"related",
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"alternate",
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"self",
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};
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iold = inew = -1;
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for (i = 0; i < 5; i++)
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{
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if (old && g_str_equal (old, rels[i]))
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iold = i;
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if (new && g_str_equal (new, rels[i]))
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inew = i;
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}
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return (inew > iold);
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}
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static void
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atom_get_link (KatzeItem* item,
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xmlNodePtr node)
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{
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gchar* oldtype;
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gchar* newtype;
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gchar* oldrel;
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gchar* newrel;
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gchar* href;
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gboolean oldishtml;
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gboolean newishtml;
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gboolean newlink;
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newlink = FALSE;
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oldtype = atom_get_link_attribute (item, "linktype");
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oldrel = atom_get_link_attribute (item, "linkrel");
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newtype = (gchar*)xmlGetProp (node, BAD_CAST "type");
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newrel = (gchar*)xmlGetProp (node, BAD_CAST "rel");
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href = (gchar*)xmlGetProp (node, BAD_CAST "href");
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if (!newrel)
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newrel = g_strdup ("alternate");
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oldishtml = (oldtype && g_str_equal (oldtype, "text/html"));
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newishtml = (newtype && g_str_equal (newtype, "text/html"));
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/* prefer HTML links over anything else.
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* if the previous link was already HTML, decide which link
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* we prefer.
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*/
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if ((newishtml && oldishtml) || (!newishtml && !oldishtml))
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newlink = atom_preferred_link (oldrel, newrel);
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else
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newlink = newishtml;
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if (newlink)
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{
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katze_item_set_uri (item, href);
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atom_set_link_attribute (item, "linkrel", newrel);
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atom_set_link_attribute (item, "linktype", newrel);
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}
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else
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{
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xmlFree (href);
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xmlFree (newrel);
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xmlFree (newtype);
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}
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}
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static void
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atom_preparse_entry (FeedParser* fparser)
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{
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fparser->item = katze_item_new ();
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}
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static void
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atom_parse_entry (FeedParser* fparser)
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{
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xmlNodePtr node;
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gchar* content;
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gint64 date;
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node = fparser->node;
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content = NULL;
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if (!xmlStrcmp (node->name, BAD_CAST "id"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_token (fparser->item, content);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "title"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_name (fparser->item, content);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "summary"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_text (fparser->item, content);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "updated"))
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{
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date = feed_get_element_date (fparser);
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katze_item_set_added (fparser->item, date);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "icon"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_icon (fparser->item, content);
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}
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/* FIXME content can be used in some cases where there
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* is no summary, but it needs additional work,
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* as it can be HTML, or base64 encoded.
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* see the spec.
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*/
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else if (!xmlStrcmp (node->name, BAD_CAST "content"))
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{
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/* Only retrieve content if there is no summary */
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if (!katze_item_get_text (fparser->item))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_text (fparser->item, content);
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}
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}
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else if (!(xmlStrcmp (node->name, BAD_CAST "link")))
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atom_get_link (fparser->item, node);
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g_free (content);
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}
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static void
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atom_postparse_entry (FeedParser* fparser)
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{
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if (!*fparser->error)
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{
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/*
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* Verify that the required Atom elements are added
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* (as per the spec)
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*/
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if (!katze_item_get_token (fparser->item) ||
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!katze_item_get_name (fparser->item) ||
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!katze_item_get_uri (fparser->item) ||
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!katze_item_get_added (fparser->item))
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{
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feed_parser_set_error (fparser, FEED_PARSE_ERROR_MISSING_ELEMENT,
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_("Failed to find required Atom entry elements in XML data."));
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}
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}
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if (KATZE_IS_ITEM (fparser->item))
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{
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atom_set_link_attribute (fparser->item, "linkrel", NULL);
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atom_set_link_attribute (fparser->item, "linktype", NULL);
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if (*fparser->error)
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{
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g_object_unref (fparser->item);
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fparser->item = NULL;
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}
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}
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}
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static void
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atom_parse_feed (FeedParser* fparser)
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{
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FeedParser* eparser;
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xmlNodePtr node;
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gchar* content;
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gint64 date;
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node = fparser->node;
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content = NULL;
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if (!xmlStrcmp (node->name, BAD_CAST "id"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_token (fparser->item, content);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "title"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_name (fparser->item, content);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "subtitle"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_text (fparser->item, content);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "updated"))
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{
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date = feed_get_element_date (fparser);
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katze_item_set_added (fparser->item, date);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "icon"))
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{
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content = feed_get_element_string (fparser);
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katze_item_set_icon (fparser->item, content);
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}
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else if (!(xmlStrcmp (node->name, BAD_CAST "link")))
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{
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atom_get_link (fparser->item, node);
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}
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else if (!xmlStrcmp (node->name, BAD_CAST "entry"))
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{
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eparser = g_new0 (FeedParser, 1);
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eparser->doc = fparser->doc;
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eparser->node = fparser->node;
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eparser->error = fparser->error;
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eparser->preparse = atom_preparse_entry;
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eparser->parse = atom_parse_entry;
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eparser->postparse = atom_postparse_entry;
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feed_parse_node (eparser);
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if (KATZE_IS_ITEM (eparser->item))
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{
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KatzeItem* item;
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if (!(item = feed_item_exists (KATZE_ARRAY (fparser->item), eparser->item)))
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katze_array_add_item (KATZE_ARRAY (fparser->item), eparser->item);
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else
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{
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g_object_unref (eparser->item);
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katze_array_move_item (KATZE_ARRAY (fparser->item), item, 0);
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}
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}
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g_free (eparser);
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}
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g_free (content);
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}
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static void
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atom_postparse_feed (FeedParser* fparser)
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{
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if (KATZE_IS_ARRAY (fparser->item))
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{
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atom_set_link_attribute (fparser->item, "linkrel", NULL);
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atom_set_link_attribute (fparser->item, "linktype", NULL);
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}
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if (!*fparser->error)
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{
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/*
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* Verify that the required Atom elements are added
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* (as per the spec)
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*/
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if (!katze_item_get_token (fparser->item) ||
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!katze_item_get_name (fparser->item) ||
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!katze_item_get_added (fparser->item))
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{
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feed_parser_set_error (fparser, FEED_PARSE_ERROR_MISSING_ELEMENT,
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_("Failed to find required Atom feed elements in XML data."));
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}
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}
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}
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FeedParser*
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atom_init_parser (void)
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{
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FeedParser* fparser;
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fparser = g_new0 (FeedParser, 1);
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g_return_val_if_fail (fparser, NULL);
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fparser->isvalid = atom_is_valid;
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fparser->update = atom_update;
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fparser->parse = atom_parse_feed;
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fparser->postparse = atom_postparse_feed;
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return fparser;
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}
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