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/* -*-objc-*-
*
* GNUstep RSS Kit
* Copyright (C) 2006 Guenther Noack
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, in version 2.1
* of the License
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#import "RSSFeed+Fetching.h"
#import "RSSFeedProtocol.h"
#import "DublinCore.h"
#import "GNUstep.h"
// #define DEBUG 1
#import "DOMParser.h"
#import "FeedParser.h"
#import "Atom03Parser.h"
#import "Atom10Parser.h"
#import "RSS10Parser.h"
#import "RSS20Parser.h"
NSString *const RSSFeedFetchedNotification = @"RSSFeedFetchedNotification";
NSString *const RSSFeedWillFetchNotification = @"RSSFeedWillFetchNotification";
NSString *const RSSFeedFetchFailedNotification = @"RSSFeedFetchFailedNotification";
#define URI_ATOM10 @"http://www.w3.org/2005/Atom"
#define URI_PURL_CONTENT @"http://purl.org/rss/1.0/modules/content/"
#define URI_PODCAST @"http://www.itunes.com/dtds/podcast-1.0.dtd"
#define URI_PURL_CONTENT @"http://purl.org/rss/1.0/modules/content/"
#define URI_PODCAST @"http://www.itunes.com/dtds/podcast-1.0.dtd"
#define URI_PURL_DUBLINCORE @"http://purl.org/dc/elements/1.1/"
@interface RSSFeed (PrivateFetching)
-(NSData*) fetchDataFromURL: (NSURL*) myURL;
-(enum RSSFeedError) fetchWithData: (NSData*)data;
-(enum RSSFeedError) parseATOM03WithRootNode: (XMLNode*) root;
-(enum RSSFeedError) parseATOM10WithRootNode: (XMLNode*) root;
-(enum RSSFeedError) parseRSS10WithRootNode: (XMLNode*) root;
-(enum RSSFeedError) parseRSS20WithRootNode: (XMLNode*) root;
- (enum RSSFeedError) setError: (enum RSSFeedError) err;
@end
@implementation RSSFeed (PrivateFetching)
/**
* URL client
*/
- (void) URL: (NSURL *) sender
resourceDidFailedLoadingWithReason: (NSString *) reason
{
/* Make sure it is ours */
if (sender != feedURL)
return;
NSLog(@"URL %@ failed loading because of %@", sender, reason);
[self setError: RSSFeedErrorMalformedURL];
[cacheData setLength: 0]; /* Clean up cache */
status = RSSFeedIsIdle;
[[NSNotificationCenter defaultCenter]
postNotificationName: RSSFeedFetchFailedNotification
object: self
userInfo: [NSDictionary dictionaryWithObject: reason forKey: @"Reason"]];
}
- (void) URL: (NSURL *) sender
resourceDataDidBecomeAvailable: (NSData *) newBytes
{
/* Make sure it is ours */
if (sender != feedURL)
return;
if (cacheData == nil) {
ASSIGN(cacheData, [NSMutableData data]);
}
[cacheData appendData: newBytes];
}
- (void) URLResourceDidFinishLoading: (NSURL *) sender
{
/* Make sure it is ours */
if (sender != feedURL)
return;
NSLog(@"%@ finished loading %@", self, sender);
if ((cacheData == nil) && [cacheData length] == 0) {
NSLog(@"No Data");
}
[self fetchWithData: cacheData];
status = RSSFeedIsIdle;
/* Clean up cache */
[cacheData setLength: 0];
NSLog(@"Process Done");
}
/**
* Fetches the feed from the URL which is stored in the myURL
* argument
*/
-(NSData*) fetchDataFromURL: (NSURL*) myURL
{
NSData* data;
if (myURL == nil) {
[self setError: RSSFeedErrorMalformedURL];
}
data = [myURL resourceDataUsingCache: NO];
if (data == nil) {
[self setError: RSSFeedErrorServerNotReachable];
}
return [[data retain] autorelease];
}
// parse ATOM 1.0
-(enum RSSFeedError) parseATOM10WithRootNode: (XMLNode*) root
{
FeedParser* parser = [Atom10Parser parserWithDelegate: self];
[parser parseWithRootNode: root];
return RSSFeedErrorNoError;
}
// parse ATOM 0.3
-(enum RSSFeedError) parseATOM03WithRootNode: (XMLNode*) root
{
FeedParser* parser = [Atom03Parser parserWithDelegate: self];
[parser parseWithRootNode: root];
return RSSFeedErrorNoError;
}
// parse RSS 2.0
-(enum RSSFeedError) parseRSS20WithRootNode: (XMLNode*) root
{
FeedParser* parser = [RSS20Parser parserWithDelegate: self];
[parser parseWithRootNode: root];
return RSSFeedErrorNoError;
}
// parse RSS 1.0
-(enum RSSFeedError) parseRSS10WithRootNode: (XMLNode*) root
{
FeedParser* parser = [RSS10Parser parserWithDelegate: self];
[parser parseWithRootNode: root];
return RSSFeedErrorNoError;
}
/**
* @private
* Uses the feed contained in data instead of the URL.
*/
-(enum RSSFeedError) fetchWithData: (NSData*)data
{
NSString* rssVersion;
NSXMLParser* parser;
XMLNode* root;
XMLNode* document;
int i;
parser = AUTORELEASE([[NSXMLParser alloc] initWithData: data]);
document = AUTORELEASE([[XMLNode alloc]
initWithName: nil
namespace: nil
attributes: nil
parent: nil]);
[parser setDelegate: document];
[parser setShouldProcessNamespaces: YES];
if ([parser parse] == NO)
{
return [self setError: RSSFeedErrorMalformedRSS];
}
root = [document firstChildElement]; // finds the root node
if (clearFeedBeforeFetching == YES)
{
status = RSSFeedIsIdle;
[self clearArticles];
}
// FIXME: Catch errors here which are returned from parsing methods!
if ([[root name] isEqualToString: @"RDF"]) // RSS 1.0 detected
{
rssVersion = @"RSS 1.0";
[self parseRSS10WithRootNode: root];
}
else if ([[root name] isEqualToString: @"rss"] &&
[[[root attributes] objectForKey: @"version"]
isEqualToString: @"2.0"]) // RSS 2.0 detected
{
rssVersion = @"RSS 2.0";
[self parseRSS20WithRootNode: root];
}
else if ([[root name] isEqualToString: @"rss"] &&
[[[root attributes] objectForKey: @"version"]
isEqualToString: @"0.91"]) // RSS 0.91 detected
{
rssVersion = @"RSS 0.91";
NSLog(@"WARNING: RSS 0.91 support is a *hack* at the moment");
[self parseRSS20WithRootNode: root];
}
else if ([[root name] isEqualToString: @"feed"] &&
[[root namespace] isEqualToString: URI_ATOM10]) // ATOM 1.0
{
rssVersion = @"ATOM 1.0";
[self parseATOM10WithRootNode: root];
}
else if ([[root name] isEqualToString: @"feed"] &&
[[[root attributes] objectForKey: @"version"]
isEqualToString: @"0.3"]) // ATOM 0.3 detected
{
rssVersion = @"ATOM 0.3";
[self parseATOM03WithRootNode: root];
}
else
{
NSLog(@"Failed to decide RSS version");
rssVersion = @"Malformed RSS?";
status = RSSFeedIsIdle;
[[NSNotificationCenter defaultCenter]
postNotificationName: RSSFeedFetchFailedNotification
object: self
userInfo: [NSDictionary dictionaryWithObject: @"Malformed RSS"
forKey: @"Reason"]];
return [self setError: RSSFeedErrorMalformedRSS];
}
// make sure all articles know their parent feed
for (i=0; i<[articles count]; i++) {
// We're in a RSSFeed, so we can assume this is a RSSArticle object.
[(RSSArticle*)[articles objectAtIndex: i] setFeed: self];
}
[[NSNotificationCenter defaultCenter]
postNotificationName: RSSFeedFetchedNotification
object: self];
status = RSSFeedIsIdle;
return [self setError: RSSFeedErrorNoError];
}
// sets the error for the feed (see RSSFeed.h)
-(enum RSSFeedError) setError: (enum RSSFeedError) err
{
lastError = err;
return err;
}
@end
@implementation RSSFeed (Fetching)
/**
* Returns the last error.
* Guaranteed to return the last fetching result.
*/
-(enum RSSFeedError) lastError
{
return lastError;
}
/**
* Fetches the feed from its feed URL, parses it and adds the found
* articles to the list of articles contained in this feed (if they
* are new).
*/
-(enum RSSFeedError) fetch
{
NSData* data;
status = RSSFeedIsFetching;
// no errors at first :-)
[self setError: RSSFeedErrorNoError];
[[NSNotificationCenter defaultCenter]
postNotificationName: RSSFeedWillFetchNotification
object: self];
data = [self fetchDataFromURL: feedURL];
status = RSSFeedIsIdle;
return [self fetchWithData: data];
}
- (void) fetchInBackground
{
if (feedURL == nil)
{
[self setError: RSSFeedErrorMalformedURL];
return;
}
if (status == RSSFeedIsFetching)
{
// FIXME: need an error for repeated loading.
// GN: Be careful. When you assign an error to that feed while it
// is actually already being fetched in the background, the
// thread that fetches the data in the background will probably
// set the feed's error code, too. You will never know which
// fetching process set the error message.
return;
}
status = RSSFeedIsFetching;
[self setError: RSSFeedErrorNoError];
[[NSNotificationCenter defaultCenter]
postNotificationName: RSSFeedWillFetchNotification
object: self];
[feedURL loadResourceDataNotifyingClient: self usingCache: NO];
}
@end
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