Learn how to connect Redbooth API in Objective-C using Oauth2. We are going to use AFNetworking and GROAuth2SessionManager libraries to simplify the process. Learn how, and start integrating Redbooth in your apps

Podfile

platform :ios, '7.0'
inhibit_all_warnings!
pod 'AFNetworking', '~> 2.2'
pod 'GROAuth2SessionManager', '~> 0.2'

Redbooth.m

- (void)loginWithUser:(NSString*)username password:(NSString*)password
{
  NSURL *apiURL = [[RedboothAPIClient sharedInstance] baseURL];
  // API Client and Secret are required
  // You can get them from Redbooth https://redbooth.com/oauth_clients registering your application
  // Once got them, introduce in two constants bellow
  NSString *apiClient = @"";
  NSString *apiSecret = @""; 
  GROAuth2SessionManager *sessionManager = [GROAuth2SessionManager managerWithBaseURL:apiURL clientID:apiClient secret:apiSecret];
  [sessionManager authenticateUsingOAuthWithPath:@"/oauth/token"
                                          username:username
                                          password:password
                                             scope:@"read_projects write_projects offline_access"
                                           success:^(AFOAuthCredential *credential) {
                                           
                                              NSLog(@"Login successful");
                                              
                                              //Setting token singleton Redbooth API Client
                                              [[RedboothApiClient sharedInstance] setAuthorizationHeaderWithToken:credential.accessToken];

                                               // Enjoy!
                                           }
                                           failure:^(NSError *error) {
                                               NSLog(@"Error login: %@", error);
                                           }];
}

RedboothAPIClient.h

//
//  RedboothAPIClient.h
//  Created by Redbooth
//

@interface RedboothApiClient : AFHTTPSessionManager

// Singleton instance
+ (RedboothApiClient *)sharedInstance;
+ (void)resetInstance;

// Authentication
- (void)setAuthorizationHeaderWithToken:(NSString *)token;

@end

RedboothAPIClient.m

//
//  RedboothAPIClient.h
//  Created by Redbooth
//

#import "RedboothApiClient.h"
#define apiURL @"https://redbooth.com"

static RedboothApiClient *_sharedInstance = nil;

@implementation RedboothApiClient

#pragma mark - Singleton instance

+ (RedboothApiClient *)sharedInstance
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedInstance = [[RedboothApiClient alloc] initWithBaseURL:[NSURL URLWithString:apiURL]];
    });
    return _sharedInstance;
}

- (id)initWithBaseURL:(NSURL *)url
{
    self = [super initWithBaseURL:url];
    if (self) {
        [self setRequestSerializer:[AFJSONRequestSerializer serializer]];
        [self setResponseSerializer:[AFJSONResponseSerializer serializer]];
        self.responseSerializer.acceptableContentTypes = [NSSet setWithArray:@[@"text/html",@"application/json",@"text/plain"]];
    }
    return self;
}

+ (void)resetInstance
{
    [_sharedInstance clearAuthorizationHeader];
    [_sharedInstance updateHeader];

    NSHTTPCookieStorage* cookies = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSArray* httpCookies = [cookies cookies];
    for (NSHTTPCookie* cookie in httpCookies) {
        [cookies deleteCookie:cookie];
    }
}


#pragma mark - Authentication
- (void)setAuthorizationHeaderWithToken:(NSString *)token
{
    [self.requestSerializer setValue:[NSString stringWithFormat:@"OAuth %@", token] forHTTPHeaderField:@"Authorization"];
}

@end