iOS Facebook SDK - Check Permissions

Question

I have a Facebook SSO working perfectly on my app, using last release of Facebook Objective-C SDK. I need to ask an extra permission inside the app if user do "something". I don't need to ask that permission if user gave it to me before, so, I guess, in Facebook SDK there should be a method

-(BOOL) checkPermission:(NSString*) permission;

so I can use it like this:

if( [facebook checkPermission:@"email"] ) {

Is there a way to do this?

score 22 · Accepted Answer · answered Jul 03 '13 at 16:01

22

This question is a bit old but you can now check what permissions the active session has without making a graph request. Here is how it's done in the HelloFacebookSample :

if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound) {
    // permission does not exist
} else {
    // permission exists
}

Just replace "publish_actions" with "email".

answered Jul 03 '13 at 16:01

Raphaël Agneau de Selve

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4
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`[FBSession activeSession].permissions` returns the permissions you requested, not the active ones. Or at least that's what I saw. See my answer below. You need `[FBRequestConnection startWithGraphPath:@"/me/permissions" completionHandler:...]`. – Ferran Maylinch Jul 02 '14 at 19:50
1

I cannot test right now but the documentation says otherwise : "The permissions granted to the access token during the authentication flow." https://developers.facebook.com/docs/reference/ios/current/class/FBSession/ – Raphaël Agneau de Selve Jul 04 '14 at 15:31
Today I updated my Facebook SDK pod from 3.9.0 to 3.15.1 and now `[FBSession activeSession].permissions` returns the right permissions and `[FBRequestConnection startWithGraphPath:@"/me/permissions" completionHandler:...]` doesn't return them anymore (now it returns {status:granted, permission:installed}). – Ferran Maylinch Jul 07 '14 at 11:48

score 7 · Answer 2 · answered Jan 13 '12 at 10:26

7

SDK not providing direct method for checking specific permissions but you can check if user granted permission to your application by checking permissions connection of user object in Graph API

GET https://graph.facebook.com/me/permissions

Same can be achieved with FQL query on permissions table

SELECT email FROM permissions WHERE uid = me()

answered Jan 13 '12 at 10:26

Juicy Scripter

25,778
6
72
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1

Thank you, based on your answer, I tried using the method `[facebook requestWithGraphPath:@"me/permissions" andDelegate:self];`. Implementing the delegate method it works perfectly. Thank you again – Giorgio Marziani de Paolis Jan 13 '12 at 11:24
1

Could you add the code for your method to determine if the e-mail permission was active or not? What will 'email' be if the permission is granted? – Smikey Feb 29 '12 at 13:47

Ferran Maylinch · Answer 3 · 2014-07-07T11:53:20.150

IMPORTANT: This seems to be true for an older version of the Facebook SDK (for example 3.9.0). In 3.15.0 it doesn't work this way anymore. You should use [session.permissions] as Raphaël Agneau says in his answer.

You have to use the following method, because [FBSession activeSession].permissions seems to return the permissions you requested, not the real ones.

[FBRequestConnection startWithGraphPath:@"/me/permissions"
                      completionHandler:^(FBRequestConnection *c, id result, NSError *error) {
  if (!error) {
    NSDictionary *permissions= [(NSArray *)[result data] objectAtIndex:0];
    if (![permissions objectForKey:@"publish_actions"]) {
      // Ok, continue with your logic
    } else {
      // Permission not found, maybe request it (see below)
    }
  } else {
    // Treat error
  }
}];

See here for more info:

https://developers.facebook.com/docs/facebook-login/ios/v2.0#permissions-checking

If the permission is not found you may want to request it this way:

[session requestNewPublishPermissions:PERMISSIONS_YOU_WANT
                      defaultAudience:FBSessionDefaultAudienceFriends
                    completionHandler:^(FBSession* session, NSError* error) {

    // Try again the /me/permissions above
}];

score 0 · Answer 4 · answered Jul 01 '15 at 19:10

Here's my code for FBSDK 4.2.0 for checking permissions. The string that's passed in is the name of the permission, e.g. "publish_actions"

- (void) checkForPermission:(NSString *)permission granted:(void (^)(void))sBlock denied:(void (^)(void))fBlock {

  if ([FBSDKAccessToken currentAccessToken]) {

    [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me/permissions" parameters:nil] startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {

        BOOL hasPermission = NO;

        if (!error) {

            NSArray *permissions = [result objectForKey:@"data"];

            for (NSDictionary *dict in permissions) {

                if ([[dict objectForKey:@"permission"] isEqualToString:permission]) {

                    if ([[dict objectForKey:@"status"] isEqualToString:@"granted"]) {

                        hasPermission = YES;
                    }
                }
            }
         }

        if (hasPermission) {

            (sBlock) ? sBlock() : sBlock;

        } else {

            (fBlock) ? fBlock() : fBlock;
        }
     }];

  } else {

    (fBlock) ? fBlock() : fBlock;
}
}

score 0 · Answer 5 · answered Jun 24 '16 at 02:35

0

For the SDK 4+ you have these 2 ways of getting the permissions:

[[FBSDKAccessToken currentAccessToken] hasGranted:@"user_photos"]

or

[[[FBSDKAccessToken currentAccessToken] permissions] containsObject:@"user_photos"]

answered Jun 24 '16 at 02:35

Pochi

13,391
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iOS Facebook SDK - Check Permissions

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