SimpleAuthFacebookProvider.m

//
//  SimpleAuthFacebookProvider.m
//  SimpleAuth
//
//  Created by Caleb Davenport on 11/6/13.
//  Copyright (c) 2013-2014 Byliner, Inc. All rights reserved.
//

#import "SimpleAuthFacebookProvider.h"

#import "ACAccountStore+SimpleAuth.h"
#import <ReactiveCocoa/ReactiveCocoa.h>

@import Social;

@implementation SimpleAuthFacebookProvider

#pragma mark - SimpleAuthProvider

+ (NSString *)type {
    return @"facebook";
}


+ (NSDictionary *)defaultOptions {
    return @{
        @"permissions" : @[ @"email" ],
        @"audience" : @[ ACFacebookAudienceOnlyMe ]
    };
}


- (void)authorizeWithCompletion:(SimpleAuthRequestHandler)completion {
    [[[self systemAccount]
     flattenMap:^RACStream *(ACAccount *account) {
         NSArray *signals = @[
             [self remoteAccountWithSystemAccount:account],
             [RACSignal return:account]
         ];
         return [self rac_liftSelector:@selector(dictionaryWithRemoteAccount:systemAccount:) withSignalsFromArray:signals];
     }]
     subscribeNext:^(NSDictionary *response) {
         completion(response, nil);
     }
     error:^(NSError *error) {
         completion(nil, error);
     }];
}


#pragma mark - Private

- (RACSignal *)allSystemAccounts {
    NSDictionary *options = @{
        ACFacebookAppIdKey : self.options[@"app_id"],
        ACFacebookPermissionsKey : self.options[@"permissions"],
        ACFacebookAudienceKey: self.options[@"audience"]
    };
    return [ACAccountStore SimpleAuth_accountsWithTypeIdentifier:ACAccountTypeIdentifierFacebook options:options];
}


- (RACSignal *)systemAccount {
    return [[self allSystemAccounts] map:^(NSArray *accounts) {
        return [accounts lastObject];
    }];
}


- (RACSignal *)remoteAccountWithSystemAccount:(ACAccount *)account {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        NSURL *URL = [NSURL URLWithString:@"https://graph.facebook.com/me"];
        SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeFacebook requestMethod:SLRequestMethodGET URL:URL parameters:nil];
        request.account = account;
        [request performRequestWithHandler:^(NSData *data, NSHTTPURLResponse *response, NSError *connectionError) {
            NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(200, 99)];
            NSInteger statusCode = [response statusCode];
            if ([indexSet containsIndex:statusCode] && data) {
                NSError *parseError = nil;
                NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&parseError];
                if (dictionary) {
                    [subscriber sendNext:dictionary];
                    [subscriber sendCompleted];
                }
                else {
                    [subscriber sendError:parseError];
                }
            }
            else {
                [subscriber sendError:connectionError];
            }
        }];
        return nil;
    }];
}


- (NSDictionary *)dictionaryWithRemoteAccount:(NSDictionary *)remoteAccount systemAccount:(ACAccount *)systemAccount {
    NSMutableDictionary *dictionary = [NSMutableDictionary new];
    
    // Provider
    dictionary[@"provider"] = [[self class] type];
    
    // Credentials
    dictionary[@"credentials"] = @{
        @"token" : systemAccount.credential.oauthToken
    };
    
    // User ID
    dictionary[@"uid"] = remoteAccount[@"id"];
    
    // Raw response
    dictionary[@"extra"] = @{
        @"raw_info" : remoteAccount,
        @"account" : systemAccount
    };
    
    // Profile image
    NSString *avatar = [NSString stringWithFormat:@"https://graph.facebook.com/%@/picture?type=large", remoteAccount[@"id"]];
    
    // Location
    NSString *location = remoteAccount[@"location"][@"name"];
    
    // User info
    NSMutableDictionary *user = [NSMutableDictionary new];
    user[@"nickname"] = remoteAccount[@"username"];
    if (remoteAccount[@"email"]) {
        user[@"email"] = remoteAccount[@"email"];
    }
    user[@"name"] = remoteAccount[@"name"];
    user[@"first_name"] = remoteAccount[@"first_name"];
    user[@"last_name"] = remoteAccount[@"last_name"];
    user[@"image"] = avatar;
    if (location) {
        user[@"location"] = location;
    }
    user[@"verified"] = remoteAccount[@"verified"] ?: @NO;
    user[@"urls"] = @{
        @"Facebook" : remoteAccount[@"link"],
    };
    dictionary[@"info"] = user;
    
    return dictionary;
}

@end