Parse User Subclass for use with FB

MyParseUser

#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#import <Parse/PFObject+Subclass.h>

@interface MyParseUser : PFUser <PFSubclassing>
+ (MyParseUser *)currentUser;
+ (void)doFbLoginWithCompletion:(void ( ^ )(BOOL success, id responseOrError))handler;
+ (BOOL)ensureLinkedToFB;
+ (BOOL)isLinkedToFB;
- (NSString*)fbValueForKey:(NSString*)key;
+ (void)ensureHasFBInfoWithCompletion:(void ( ^ )(BOOL success, id responseOrError))handler;
+ (void)fetchFacebookDataWithCompletion:(void ( ^ )(BOOL success, id responseOrError))handler;
- (void)gotFacebookDataWithResult:(NSDictionary *)resultParam;
- (UIImage *)profileImg;
+ (NSString *)imgUrlForFacebookId:(NSString *)facebookId;
+ (NSString *)largeImgUrlForFacebookId:(NSString *)facebookId;
- (void)setParseUserForInstallation;
@end



#import "MyParseUser.h"
#import <FacebookSDK/FacebookSDK.h>

@implementation MyParseUser

-(id)init
{
    self = [super init];//WithClassName:@"MyParseUser"];
    if (self) {
    }
    return self;
}

// user pressed button to login with fb
+ (void)doFbLoginWithCompletion:(void ( ^ )(BOOL success, id responseOrError))handler {
    NSArray *permissionsArray = @[ @"user_about_me", @"user_birthday", @"user_location", @"email"];
    [PFFacebookUtils logInWithPermissions:permissionsArray block:^(PFUser *user, NSError *error) {
        // stop animating loading indicator here if we're doing that
        
        if (!user) {
            if (!error) {
                DLog(@"Uh oh. The user cancelled the Facebook login.");
                handler(NO, @"Need to come up with an error here to show that they cancelled the login");
            } else {
                DLog(@"Uh oh. An error occurred: %@", error);
                handler(NO, error);
                // NOTE: this is an error
            }
        } else if (user.isNew) {
            DLog(@"User with facebook signed up and logged in!");
            // Send request for the details to Facebook
            [MyParseUser fetchFacebookDataWithCompletion:^(BOOL success, id responseOrError) {
                if (success) {
                    DLog(@"doFbLoginWithCompletion ok, has fb info");
                    handler(YES, user);
                } else {
                    DLog(@"doFbLoginWithCompletion failed to fetch fb info");
                    // NOTE: this is an error
                    handler(NO, responseOrError);
                }
            }];
        } else { // user previously authed us
            DLog(@"User with facebook logged in!");
            // unclear what we should do here. most of the time no need to Send request to Facebook because we already have the info we need. but sometimes this is a new install on a new device.
            [MyParseUser fetchFacebookDataWithCompletion:^(BOOL success, id responseOrError) {
                if (success) {
                    DLog(@"doFbLoginWithCompletion ok, has fb info");
                    handler(YES, user);
                } else {
                    DLog(@"doFbLoginWithCompletion failed to fetch fb info");
                    // NOTE: this is an error
                    handler(NO, responseOrError);
                }
            }];
        }
    }];
}

+ (BOOL)ensureLinkedToFB
{
    // Check if user is cached and linked to Facebook, if not, logout
    if ([MyParseUser isLinkedToFB]) {
        return YES;
    } else {
        [[NSNotificationCenter defaultCenter] postNotificationName:@"LogoutUser" object:nil];
        return NO;
    }
}

+ (BOOL)isLinkedToFB
{
    if ([MyParseUser currentUser] && [PFFacebookUtils isLinkedWithUser:[MyParseUser currentUser]]) {
        return YES;
    } else {
        return NO;
    }
}

+ (MyParseUser *)currentUser {
    return (MyParseUser *)[PFUser currentUser];
}

+ (void)ensureHasFBInfoWithCompletion:(void ( ^ )(BOOL success, id responseOrError))handler
{
    if ([MyParseUser ensureLinkedToFB]) {
        if ([[MyParseUser currentUser] fbValueForKey:@"facebookId"] != nil) { // Check if it has fb info
            handler(YES, nil);
        } else { // linked but doesn't have data yet
            [MyParseUser fetchFacebookDataWithCompletion:^(BOOL success, id responseOrError) {
                if (success) {
                    DLog(@"MyParseUser::ensureHasFBInfoWithCompletion successfully fetched fb data");
                    [[MyParseUser currentUser] setParseUserForInstallation]; // usually overkill
                    handler(YES, nil);
                } else {
                    DLog(@"MyParseUser::ensureHasFBInfoWithCompletion failed to fetch fb data");
                    handler(NO, nil);
                }
            }];
        }
    } // if not linked, will go to logout
}

+ (void)fetchFacebookDataWithCompletion:(void ( ^ )(BOOL success, id responseOrError))handler
{
    if ([MyParseUser ensureLinkedToFB]) {
        FBRequest *request = [FBRequest requestForMe];
        
        // Send request to Facebook
        [request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
            if (!error) {
                [[MyParseUser currentUser] gotFacebookDataWithResult:(NSDictionary*)result];
                handler(YES, nil);
            } else if ([error.userInfo[FBErrorParsedJSONResponseKey][@"body"][@"error"][@"MyPe"] isEqualToString:@"OAuthException"]) { // Since the request failed, we can check if it was due to an invalid session
                DLog(@"The facebook session was invalidated");
            } else {
                DLog(@"Some other error: %@", error);
            }
        }];
    }
}

- (void)gotFacebookDataWithResult:(NSDictionary *)resultParam
{
    NSString *facebookId = resultParam[@"id"];
    
    NSMutableDictionary *userProfile = [NSMutableDictionary dictionaryWithCapacity:8];
    
    if (facebookId) userProfile[@"facebookId"] = facebookId;
    if (resultParam[@"name"]) userProfile[@"name"] = resultParam[@"name"];
    if (resultParam[@"email"]) userProfile[@"email"] = resultParam[@"email"];
    if (resultParam[@"location"][@"name"]) userProfile[@"location"] = resultParam[@"location"][@"name"];
    if (resultParam[@"gender"]) userProfile[@"gender"] = resultParam[@"gender"];
    if (resultParam[@"birthday"]) userProfile[@"birthday"] = resultParam[@"birthday"];
    if (facebookId != nil) userProfile[@"pictureURL"] = [MyParseUser imgUrlForFacebookId:facebookId];
    [self setObject:userProfile forKey:@"fbprofile"];
    
    [self saveInBackground];
}

- (UIImage *)profileImg
{
    NSData * imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[MyParseUser imgUrlForFacebookId:[self fbValueForKey:@"facebookId"]]]];
    UIImage *fbProfileImg = [UIImage imageWithData: imageData];
    return fbProfileImg;
}

+ (NSString *)imgUrlForFacebookId:(NSString *)facebookId
{
    NSString *pictureURL = [NSString stringWithFormat:@"https://graph.facebook.com/%@/picture?MyPe=small&return_ssl_resources=1", facebookId];
    return pictureURL;
}

+ (NSString *)largeImgUrlForFacebookId:(NSString *)facebookId
{
    NSString *pictureURL = [NSString stringWithFormat:@"https://graph.facebook.com/%@/picture?MyPe=large&return_ssl_resources=1", facebookId];
    return pictureURL;
}

- (NSString *)fbValueForKey:(NSString*)key
{
    if ([self objectForKey:@"fbprofile"]) {
        return [[self objectForKey:@"fbprofile"] objectForKey:key];
    } else {
        return nil;
    }
}

- (void)setParseUserForInstallation
{
    PFInstallation *currentInstallation = [PFInstallation currentInstallation];
    [currentInstallation setObject:self forKey:@"user"];
    [currentInstallation saveEventually];
}

@end