PJCSpencer / SwiftOAuth2Client

General purpose Swift based OAuth2 client application for iOS

SwiftOAuth2Client

General purpose Swift based OAuth2 client application for iOS

Two legged example using Twitter

Here's the guide which was used:
https://developer.twitter.com/en/docs/authentication/oauth-2-0/bearer-tokens

Apply for a new Twitter developer account here: https://developer.twitter.com and once this has been approved create a new app here: https://developer.twitter.com/en/apps where a new set of keys can be created. Store in a safe place!

Copy & paste the keys into OAuth2ClientCredentials which can be found in PJCAppDelegate.swift.

var clientCredentials: OAuth2ClientCredentials
{
    return  OAuth2ClientCredentials(apiKey: "<paste api key here>",
				    apiSecretKey: "<paste api secret key here>")
}

Add the desired scopes.

var scopes: [String]
{
    return ["<add scope(s) here>"]
}

Edit the example hosts found in PJCEnvironment.swift.

static var host: OAuth2Host
{
    switch PJCEnvironment.current
    {
    default: return TwitterOAuth2()
    }
}

var authHost: OAuth2Host { return PJCEnvironment.host }

var tokenHost: OAuth2Host? { return nil) }

Switch the comments for the two legged example in PJCOAuth2ViewController.swift

// self.threeLeggedExample(callAPIs: false)
self.twoLeggedExample()

Three legged example using Google

Here's the guide:
https://developers.google.com/identity/protocols/oauth2/native-app#ios

⚠️ Copy & paste redirect_uri project credential into Info.plist -> URL types -> URL Schemes -> Item 0 making sure to remove any colon on the right side of the string

Copy & paste GoogleAPIs cedentials into OAuth2AuthorizationCredentials which can be found in PJCAppDelegate.swift.

var authorizationCredentials: OAuth2AuthorizationCredentials
{
    return OAuth2AuthorizationCredentials("<paste client id here>",
					  redirectUri: "<paste redirect uri here>")
}

Add the desired scopes. APIs/services will need to be enabled for the project using the GoogleAPIs console dashboard.

var scopes: [String]
{
    return ["<add scope(s) here>"]
}

Edit the example hosts found in PJCEnvironment.swift.

static var host: OAuth2Host
{
    switch PJCEnvironment.current
    {
    default: return GoogleAccounts()
    }
}

var authHost: OAuth2Host { return PJCEnvironment.host }

var tokenHost: OAuth2Host? { return GoogleOAuth2() }

Switch the comments for the three legged example in PJCOAuth2ViewController.swift

self.threeLeggedExample(callAPIs: false)
// self.twoLeggedExample()

Three legged example using Spotify

Here's the guide:
https://developer.spotify.com/documentation/general/guides/authorization-guide

Generally follow the steps for the three legged Google example with the folowing changes:

• Invent a scheme to use for both redirect_uri and Info.plist -> URL types -> URL Schemes -> Item 0
• Add the optional authorizationCredentials -> client_secret credential
• Return SpotifyAccounts for the environment host, return nil for tokenHost

Project Information

Xcode 12.1
Swift 5
Deployment Target 14.1

Some useful OAuth2 links

https://en.wikipedia.org/wiki/OAuth
https://oauth.net/2
https://aaronparecki.com/oauth-2-simplified
https://tools.ietf.org/html/rfc6749