gistfile1.m

- (void)refreshFavicons:(NSArray *)subscriptions
                  force:(BOOL)flag
{
    LOGGED_IN
    for( GDataSubscription * subscription in subscriptions )
    {
        
        if( ! flag && [[self delegate] respondsToSelector:@selector(gDataController:checkFaviconExistanceForSubscription:)] )
        {
            if( [[self delegate] gDataController:self
            checkFaviconExistanceForSubscription:subscription] )
            {
                continue;
            }
        }
        
        [favIconQueue addOperationWithBlock:^(void){
            
            NSString * url = [[subscription identifier] stringByReplacingOccurrencesOfString:@"feed/" 
                                                                    withString:@""];
            
            if( [subscription htmlURL] )
            {
                url = [subscription htmlURL];
            }
            
            url = [[NSURL URLWithString:url] host];
            
            // check the link href
            
            NSError * error;
            
            NSString * html = [NSString stringWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://%@",url]]
                                                       encoding:NSUTF8StringEncoding
                                                          error:&error];
            
            if( [html length] )
            {
                
                NSXMLDocument * DOM = [[[NSXMLDocument alloc] initWithXMLString:html
                                                                        options:NSXMLDocumentTidyHTML
                                                                          error:&error] autorelease];
                
                NSArray * nodes = [[DOM rootElement] nodesForXPath:@"head/link[@rel='shortcut icon']"
                                                             error:&error];
                if( [nodes count] )
                {
                    NSString * href = [[[nodes lastObject] attributeForName:@"href"] stringValue];
                    if( [href rangeOfString:@"http"].location != NSNotFound )
                    {
                        url = href;
                    } else {
                        url = [NSString stringWithFormat:@"http://%@%@",url,href];
                    }
                } else {
                    url = [NSString stringWithFormat:@"http://%@/favicon.ico",url];
                }
                
                
            } else {
                url = [NSString stringWithFormat:FAVICON_URL,url];
            }
            
            NSData * blob = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
            
            dispatch_async( dispatch_get_main_queue(), ^{
                
                NSData * returnData = blob;
                
                if( ! [blob length] )
                {
                    returnData = nil;
                }
                
                // tell the delegate we receieved the data
                
                if( [[self delegate] conformsToProtocol:@protocol(GDataControllerDelegate)] )
                {
                    [[self delegate] gDataController:self
                              didReceieveFaviconData:returnData
                                     forSubscription:subscription];
                }
                
            });
            
        }];
    }
}