CqX18iSv

1- (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString 
2                               refreshToken:(NSString *)refreshToken
3                               success:(void (^)(AFOAuthCredential *credential))success
4                               failure:(void (^)(NSError *error))failure;
5	
6func refreshTokenIfUnavailable(completionHandler : @escaping(_ finished:Bool,_ error:Error) -> ()) {
7    let credentialData = UserDefaults.standard.object(forKey: CREDENTIAL) as? NSData
8
9    if let credentialData = credentialData {
10        let credential = NSKeyedUnarchiver.unarchiveObject(with: credentialData as Data) as? AFOAuthCredential
11
12        if let _ = credential
13        {
14            if credential!.isExpired {
15                let urlString = OAUTH_BASE_URL
16                let url = URL(string: urlString)
17                let oAuthManager = AFOAuth2Manager(baseURL: url!, clientID: YOUR_AUTH_CLIENT_ID secret: YOUR_AUTH_SECRET_ID)
18                oAuthManager.authenticateUsingOAuth(withURLString: "oauth/token", refreshToken: (credential?.refreshToken)!, success: { (credential) in
19                    self.saveAccessToken(credential: credential)
20                    completionHandler(true,YOUR_ERROR))
21                }, failure: { (error) in
22                    completionHandler((credential != nil),NSError(domain: "", code: 204, userInfo: [NSLocalizedDescriptionKey: error.localizedDescription]))
23                })
24            }
25            completionHandler((credential != nil),YOUR_ERROR_MESSAGE))
26        }
27    }
28}
29
30func saveAccessToken(credential : AFOAuthCredential) {
31
32    KeychainService.saveAccessToken(service: ACCESS_TOKEN as NSString, data: credential.accessToken as NSString)
33
34    let credentialData = NSKeyedArchiver.archivedData(withRootObject: credential)
35    let userDefaults = UserDefaults.standard
36    userDefaults.set(credentialData, forKey: "credentials")
37    userDefaults.synchronize()
38}