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    ###### tags: `第13屆IT邦鐵人賽文章` # 【在 iOS 開發路上的大小事-Day23】透過 Firebase 將多種 OAuth 身份驗證方式連結在單一帳號上 # 前情提要 你有想過 Line、KKBOX 等 App 上面的「與外部帳號連結」是怎麼做到的嗎 ![](https://i.imgur.com/LSiRczH.jpg) ▲ Line ![](https://i.imgur.com/49Rb6rQ.jpg) ▲ KKBOX 其實都是用到類似今天這篇要分享的方法-**與其他帳號連結 (Link To Other Account)** # 開始實作~ 首先先到 Firebase Auth 官方開發文件 點擊「[Link Multiple Auth Providers to an Account on iOS](https://firebase.google.com/docs/auth/ios/account-linking)」 ![](https://i.imgur.com/RYWhEc1.png) 在文件中可以看到,如果要將其他身份驗證提供者與單一帳號做連結的話 會需要用到 Credential (憑證) 這個東西,那這個東西要怎麼生出來呢,其實很簡單 因為先前在分享 Google 帳號、Facebook 帳號、Apple ID 登入的時候就已經有產生了 [【在 iOS 開發路上的大小事-Day18】透過 Firebase 來管理使用者 (Sign in with Google 篇) Part2](https://hackmd.io/@leoho0722/HyCi55MeF) [【在 iOS 開發路上的大小事-Day20】透過 Firebase 來管理使用者 (Sign in with Facebook 篇) Part2](https://hackmd.io/@leoho0722/rkh5_h_et) [【在 iOS 開發路上的大小事-Day22】透過 Firebase 來管理使用者 (Sign in with Apple 篇) Part2](https://hackmd.io/@leoho0722/rkCg-Io-K) ```swift= // Sign in with Google let credential = GoogleAuthProvider.credential(withIDToken: idToken, accessToken: authentication.accessToken) // Sign in with Facebook let credential = FacebookAuthProvider.credential(withAccessToken: accessToken.tokenString) // Sign in with Apple let credential = OAuthProvider.credential(withProviderID: "apple.com", idToken: idTokenString, rawNonce: nonce) ``` 接下來就來透過 Credential 來將多種 OAuth 身份驗證提供者通通連結在一起 下面就以 Sign in with Google 來做示範,其他的登入方式做法都是大同小異的~ 先前分享的 Sign in with Google 與 Firebase Auth 連接的部分如下 ```swift= func firebaseSignInWithGoogle(credential: AuthCredential) { Auth.auth().signIn(with: credential) { authResult, error in guard error == nil else { CustomFunc.customAlert(title: "", message: "\(String(describing: error!.localizedDescription))", vc: self, actionHandler: nil) return } CustomFunc.customAlert(title: "登入成功!", message: "", vc: self, actionHandler: self.getFirebaseUserInfo) } } ``` 我們要將它改成下面這樣,透過 Credential 來與其他 OAuth 身份驗證方式連結在一起 ```swift= func firebaseSignInWithGoogle(credential: AuthCredential) { if let user = Auth.auth().currentUser { user.link(with: credential) { authResult, error in if let error = error { CustomFunc.customAlert(title: "", message: "\(String(describing: error.localizedDescription))", vc: self, actionHandler: nil) return } CustomFunc.customAlert(title: "", message: "與其他登入方式的帳號連結成功!", vc: self, actionHandler: nil) } } else { Auth.auth().signIn(with: credential) { authResult, error in guard error == nil else { CustomFunc.customAlert(title: "", message: "\(String(describing: error!.localizedDescription))", vc: self, actionHandler: nil) return } CustomFunc.customAlert(title: "登入成功!", message: "", vc: self, actionHandler: self.getFirebaseUserInfo) } } } ``` 假設有一天突然改變心意,像是變心的人一樣 不想再與其進行連結的話,可以透過下面的方法來解除 (切八段) ```swift= let providerID = Auth.auth().currentUser?.providerID Auth.auth().currentUser?.unlink(fromProvider: providerID!) { user, error in if let error = error { CustomFunc.customAlert(title: "", message: "\(String(describing: error.localizedDescription))", vc: self, actionHandler: nil) return } CustomFunc.customAlert(title: "", message: "已取消與其他登入方式的帳號連結!", vc: self, actionHandler: nil) } ``` # 總結 以上就是透過 Firebase Auth 來與多個 OAuth 身份驗證提供者進行連結和解除連結的方法~ 參考資料: 1. [Link Multiple Auth Providers to an Account on iOS (Firebase Auth 官方文件)](https://firebase.google.com/docs/auth/ios/account-linking)

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