Twitter OAuth made simple for iOS using ASWebAuthenticationSession. 🕵🏽♀️
- Head to your scheme on Xcode and select Swift Package Manger.
- Copy/Paste the URL of the TwiAuth repo and proceed to install the latest version or master, as desire.
Let's see how it fits with your ViewController.
class ViewController: UIViewController {
let twiAuth
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
let config = CredentialsConfig(
consumerKey: "consumer-key",
consumerSecret: "consumer-secret",
callbackScheme: "callback-scheme"
)
twiAuth = TwiAuth(config: config)
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
}
}
This is how it looks as base setup. But this isn't functional yet. Since TwiAuth uses ASWebAuthenticationSession under the hood, it requires the authorization the user via its own view controller that needs to be presented on a provided window. Let's look at how we can configure ASWebAuthenticationPresentationContextProviding.
class ViewController: UIViewController {
let twiAuth
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
....
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
// Sets the presentation context.
twiAuth.presentationContextProviding = self
}
}
extention ViewController: ASWebAuthenticationPresentationContextProviding {
func presentationAnchor(for session: ASWebAuthenticationSession) -> ASPresentationAnchor {
return view.window!
}
}
TwitAuth comes with a handy TwiAuthTokenProviding protocol for convenience to write and read token wherever you app decides to store them.
This convenience would allow TwiAuth to read an existing token and respond back instead to generating a new one. Let' see how we can confirm to this.
class ViewController: UIViewController {
let twiAuth
init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
....
super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
// TwiAuthTokenProviding conformance.
twiAuth.tokenProviding = self
}
}
extension ViewController: TwiAuthTokenProviding {
func read() -> AccessToken? {
try? keychain.retrieve()
}
func write(token: AccessToken) {
do {
try keychain.save(token: token)
} catch {
debugPrint("error while saving token: \(error)")
}
}
}
TwitAuth to provide the authorization header String so your client can directly sign the request themselves.
let oauthHeader = twiAuth.accessTokenAuthHeader(url: url, method: method)
var request = URLRequest(url: endpoint.url)
request.addValue(oauthHeader, forHTTPHeaderField: "Authorization")
✨ Happy Hacking with Twitter Api! 👨🏽💻 👨🏽🎨
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