September, 2010

So Twitter just updated their API to disallow the use of authentication through the REST API. They were nice enough to announce that in an email 2 days after they turned it off so that meant that I had to learn all about OAuth overnight and scramble to find something that could take over the Twitter functionality of the LogYourRun iPhone app.

Luckily most of the leg work in this are has been done by Matt Gemmell and his Twitter engine. Some slight modifications are required in order to get it running on the iPhone and working with OAuth.  Update:  The guys at iCodeBlog have a great tutorial on how to implement the libraries.

With these libraries dropped in the new Twitter authentication system is fairly easy to implement. The main problem is that the MGTwitterEngine does not support the Twitter location API. Since this is an important piece of TweetMyDistance I modified the MGTwitterEngine.m and added a function for tweeting with location. The new method takes latitude and longitude as well as the tweet and if this is a reply to a previous tweet. As you can see from my tweet it works great. The code below should replace the code in MGTwitterEngine and don’t forget to also update your .h file.

- (NSString *)sendUpdate:(NSString *)status
{
    return [self sendUpdate:status inReplyTo:0];
}

- (NSString *)sendUpdate:(NSString *)status inReplyTo:(unsigned long)updateID
{

	return [self sendUpdate: status inReplyTo: updateID withLatitude: 0.0 andLongitude: 0.0];

}

- (NSString *)sendUpdate:(NSString *)status
			   inReplyTo:(unsigned long)updateID
			withLatitude:(double) lat
			andLongitude: (double) lng
{
	if (!status) {
        return nil;
    }

    NSString *path = [NSString stringWithFormat:@"statuses/update.%@", API_FORMAT];

    NSString *trimmedText = status;
    if ([trimmedText length] > MAX_MESSAGE_LENGTH) {
        trimmedText = [trimmedText substringToIndex:MAX_MESSAGE_LENGTH];
    }

    NSMutableDictionary *params = [NSMutableDictionary dictionaryWithCapacity:0];
    [params setObject:trimmedText forKey:@"status"];
    if (updateID > 0) {
        [params setObject:[NSString stringWithFormat:@"%u", updateID] forKey:@"in_reply_to_status_id"];
    }
    if (lat != 0.0 && lng != 0.0) {
		// lat=%1.6f&long=%1.6f&display_coordinates=true
        [params setObject:[NSString stringWithFormat:@"%1.6f", lat] forKey:@"lat"];
        [params setObject:[NSString stringWithFormat:@"%1.6f", lng] forKey:@"long"];
        [params setObject:@"true" forKey:@"display_coordinates"];
    }
    NSString *body = [self _queryStringWithBase:nil parameters:params prefixed:NO];

	DLog(@" twitterbody: %@", body);

    return [self _sendRequestWithMethod:HTTP_POST_METHOD path:path
                        queryParameters:params body:body
                            requestType:MGTwitterUpdateSendRequest
                           responseType:MGTwitterStatus];
}