KTOAuth

KTOAuth is a Swift library which let's the user authenticate against a webservice using OAuth2. I'm using to authenticate through a UIWebView inside a UIViewController, but you could probably still use it in Safari as well (hint: use openURL: and handle the redirect in your app).

Installation

Cocoapods

Soon, really soon.

In the meantime

Add the KTOAuth folder manually to your project.

Config.swift

In case you want to use the config rename Config.swift.example to Config.swift, adjust the settings and add it to your project as well.

Usage

In order for you to receive an access_token, you'll have to instantiate a new instance of KTOAuthClient and set the UIViewController as the delegate of the client:

var client = KTOAuthClient(clientId: Config.OAuth.ClientID, clientSecret: Config.OAuth.ClientSecret, redirectURI: Config.OAuth.RedirectURI, authorizeURL: Config.OAuth.AuthorizeURL, tokenURL: Config.OAuth.TokenURL)
client.delegate = self

I've used the example Config struct included in this repository to set the required data and passed that into the KTOAuthClient init as can be seen above.

The next step is to generate the authorize URL which you'll have to load in the UIWebView:

webView.loadRequest(NSURLRequest(URL: NSURL(string: client.authorizeUrl())!))

Next up is the call to the retrieveAuthorizationCode method to start the OAuth2 process. You'll probably want to call it in the webView:shouldStartLoadWithRequest:navigationType delegate method of UIWebViewDelegate:

extension WebViewController: UIWebViewDelegate {
  func webView(webView: UIWebView!, shouldStartLoadWithRequest request: NSURLRequest!, navigationType: UIWebViewNavigationType) -> Bool {
    return client.retrieveAuthorizationCode(request.URL.absoluteString!)
  }
}

Now all you need to do is add the required KTOAuthClientDelegate protocol methods and you're done:

extension WebViewController: KTOAuthClientDelegate {
  func didReceiveAccessToken(json: JSON) {
  	println(json)
  }

  func didReceiveAccessTokenError(error: NSError) {
    println(error)
  }

  func didReceiveAuthorizationCodeError(error: NSError) {
    println(error)
  }
}

Refresh your token

Once the access token has expired, you'll have to refresh your token. You can use the class method accessTokenHasExpired: to check whether that is really the case and if so, call refreshAccessToken:callback::

client.refreshAccessToken(refreshToken) { (data: JSON) in
  println(data)
}

You'll have to use the refresh token you received when you first got the access token. You will also need the expiration date. So, it's probably a good idea to save all three (access token, refresh token and expiration date) once you've received them.

Dependencies

Alamofire - Elegant HTTP Networking in Swift.
SwiftyJSON - The better way to deal with JSON data in Swift.

kevintuhumury / KTOAuth