objective c - Using app access token in IOS

Question

Since Facebook changed their policy on having a access token or not I am now forced to include an access token to fetch a user public posts.

As read in the documentation I can use an app access token so I still can fetch the posts without asking a user for permissions. But since I have no clue how this works, and the facebook documentation doesn't give a example concerning how to implement this on IOS, I want to ask your help!

Does anyone has an example on how I need to implement this in my code? Thnx in advance!!

Answer 1

I'm not sure if it's what you are looking for, but if you are trying to do something simple like getting the public posts of a user, you can do it like this.

Use the following request to get the token:

https://graph.facebook.com/oauth/access_token?client_id=YOUR_APP_ID&client_secret=YOUR_APP_SECRET&grant_type=client_credentials

I'm guessing you've got your app id and secret since you've retrieved the token already. Anyway, the token will be returned in the response like this:

access_token=ACCESS_TOKEN

Parse out the token: and put it in the following request:

https://graph.facebook.com/FACEBOOK_USER_ID/posts?access_token=ACCESS_TOKEN

You can use the following code to parse out the token:

    NSRange access_token_range = [responseString rangeOfString:@"access_token="];
    if (access_token_range.length > 0) {
        int from_index = access_token_range.location + access_token_range.length;
        NSString *access_token = [responseString substringFromIndex:from_index];

        NSLog(@"access_token:  %@", access_token);
    }

EDIT: The get posts URL will give BadURL due to illegal chars. You can do like this to fix it:

NSString *encodedURLString = [yourUrlString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];    
NSURL *url = [NSURL URLWithString:encodedURLString];

I'm not using the Facebook SDK, so I don't really know how it works, but I guess that you should do something like this:

[_facebook requestWithGraphPath:@"[user_id]/feed" 
                  andParams:[NSMutableDictionary dictionaryWithObject:ACCESS_TOKEN forKey:@"access_token"]
              andHttpMethod:@"GET"
                andDelegate:self];