Catch up on everthing we announced at this year's Firebase Summit. Learn more

使用 JavaScript 將多個身份驗證提供程序鏈接到一個帳戶

通過將身份驗證提供程序憑據鏈接到現有用戶帳戶,您可以允許用戶使用多個身份驗證提供程序登錄您的應用程序。用戶可以通過相同的 Firebase 用戶 ID 進行識別,而不管他們用於登錄的身份驗證提供程序如何。例如,使用密碼登錄的用戶可以關聯 Google 帳戶並在以後使用任一方法登錄。或者,匿名用戶可以關聯 Facebook 帳戶,然後在稍後登錄 Facebook 以繼續使用您的應用。

在你開始之前

向您的應用添加對兩個或多個身份驗證提供程序(可能包括匿名身份驗證)的支持。

要將來自身份驗證提供商(例如 Google 或 Facebook)的憑據鏈接到現有用戶帳戶:

  1. 使用任何身份驗證提供程序或方法登錄用戶。
  2. 獲取AuthProvider對象,對應於提供商要鏈接到用戶的賬戶。例子:

    網頁版 9

    import { GoogleAuthProvider, FacebookAuthProvider, TwitterAuthProvider, GithubAuthProvider } from "firebase/auth";
    
    const googleProvider = new GoogleAuthProvider();
    const facebookProvider = new FacebookAuthProvider();
    const twitterProvider = new TwitterAuthProvider();
    const githubProvider = new GithubAuthProvider();

    網頁版 8

    var googleProvider = new firebase.auth.GoogleAuthProvider();
    var facebookProvider = new firebase.auth.FacebookAuthProvider();
    var twitterProvider = new firebase.auth.TwitterAuthProvider();
    var githubProvider = new firebase.auth.GithubAuthProvider();
  3. 提示用戶使用您要鏈接的提供商登錄。您可以通過打開彈出窗口或重定向到提供商的登錄頁面來提示用戶登錄。在移動設備上首選重定向方法。
    • 要使用彈出窗口登錄,電話linkWithPopup

      網頁版 9

      import { getAuth, linkWithPopup, GoogleAuthProvider } from "firebase/auth";
      const provider = new GoogleAuthProvider();
      
      const auth = getAuth();
      linkWithPopup(auth.currentUser, provider).then((result) => {
        // Accounts successfully linked.
        const credential = GoogleAuthProvider.credentialFromResult(result);
        const user = result.user;
        // ...
      }).catch((error) => {
        // Handle Errors here.
        // ...
      });

      網頁版 8

      auth.currentUser.linkWithPopup(provider).then((result) => {
        // Accounts successfully linked.
        var credential = result.credential;
        var user = result.user;
        // ...
      }).catch((error) => {
        // Handle Errors here.
        // ...
      });
    • 要通過重定向到提供商的登錄登錄頁面,通話linkWithRedirect

      網頁版 9

      import { getAuth, linkWithRedirect, GoogleAuthProvider } from "firebase/auth";
      const provider = new GoogleAuthProvider();
      
      const auth = getAuth();
      linkWithRedirect(auth.currentUser, provider)
        .then(/* ... */)
        .catch(/* ... */);

      網頁版 8

      auth.currentUser.linkWithRedirect(provider)
        .then(/* ... */)
        .catch(/* ... */);
      用戶登錄後,他們將被重定向回您的頁面。然後,您可以通過調用檢索簽入結果getRedirectResult當你的頁面加載:

      網頁版 9

      import { getRedirectResult } from "firebase/auth";
      getRedirectResult(auth).then((result) => {
        const credential = GoogleAuthProvider.credentialFromResult(result);
        if (credential) {
          // Accounts successfully linked.
          const user = result.user;
          // ...
        }
      }).catch((error) => {
        // Handle Errors here.
        // ...
      });

      網頁版 8

      auth.getRedirectResult().then((result) => {
        if (result.credential) {
          // Accounts successfully linked.
          var credential = result.credential;
          var user = result.user;
          // ...
        }
      }).catch((error) => {
        // Handle Errors here.
        // ...
      });
    如果用戶成功登錄,則該用戶在提供商處的帳戶將關聯到您的 Firebase 項目中的用戶帳戶。

    如果憑據已鏈接到另一個用戶帳戶,則帳戶鏈接將失敗。在這種情況下,您必鬚根據您的應用程序處理合併帳戶和關聯數據:

    網頁版 9

    import { getAuth, signInWithCredential, linkWithCredential, OAuthProvider } from "firebase/auth";
    
    // The implementation of how you store your user data depends on your application
    const repo = new MyUserDataRepo();
    
    // Get reference to the currently signed-in user
    const auth = getAuth();
    const prevUser = auth.currentUser;
    
    // Get the data which you will want to merge. This should be done now
    // while the app is still signed in as this user.
    const prevUserData = repo.get(prevUser);
    
    // Delete the user's data now, we will restore it if the merge fails
    repo.delete(prevUser);
    
    // Sign in user with the account you want to link to
    signInWithCredential(auth, newCredential).then((result) => {
      console.log("Sign In Success", result);
      const currentUser = result.user;
      const currentUserData = repo.get(currentUser);
    
      // Merge prevUser and currentUser data stored in Firebase.
      // Note: How you handle this is specific to your application
      const mergedData = repo.merge(prevUserData, currentUserData);
    
      const credential = OAuthProvider.credentialFromResult(result);
      return linkWithCredential(prevUser, credential)
        .then((linkResult) => {
          // Sign in with the newly linked credential
          const linkCredential = OAuthProvider.credentialFromResult(linkResult);
          return signInWithCredential(auth, linkCredential);
        })
        .then((signInResult) => {
          // Save the merged data to the new user
          repo.set(signInResult.user, mergedData);
        });
    }).catch((error) => {
      // If there are errors we want to undo the data merge/deletion
      console.log("Sign In Error", error);
      repo.set(prevUser, prevUserData);
    });

    網頁版 8

    // The implementation of how you store your user data depends on your application
    var repo = new MyUserDataRepo();
    
    // Get reference to the currently signed-in user
    var prevUser = auth.currentUser;
    
    // Get the data which you will want to merge. This should be done now
    // while the app is still signed in as this user.
    var prevUserData = repo.get(prevUser);
    
    // Delete the user's data now, we will restore it if the merge fails
    repo.delete(prevUser);
    
    // Sign in user with the account you want to link to
    auth.signInWithCredential(newCredential).then((result) => {
      console.log("Sign In Success", result);
      var currentUser = result.user;
      var currentUserData = repo.get(currentUser);
    
      // Merge prevUser and currentUser data stored in Firebase.
      // Note: How you handle this is specific to your application
      var mergedData = repo.merge(prevUserData, currentUserData);
    
      return prevUser.linkWithCredential(result.credential)
        .then((linkResult) => {
          // Sign in with the newly linked credential
          return auth.signInWithCredential(linkResult.credential);
        })
        .then((signInResult) => {
          // Save the merged data to the new user
          repo.set(signInResult.user, mergedData);
        });
    }).catch((error) => {
      // If there are errors we want to undo the data merge/deletion
      console.log("Sign In Error", error);
      repo.set(prevUser, prevUserData);
    });

要將電子郵件地址和密碼憑據添加到現有用戶帳戶:

  1. 使用任何身份驗證提供程序或方法登錄用戶。
  2. 提示用戶輸入電子郵件地址和新密碼。
  3. 創建AuthCredential的電子郵件地址和密碼的對象:

    網頁版 9

    import { EmailAuthProvider } from "firebase/auth";
    
    const credential = EmailAuthProvider.credential(email, password);

    網頁版 8

    var credential = firebase.auth.EmailAuthProvider.credential(email, password);
  4. 傳遞AuthCredential對象的登錄用戶的linkWithCredential方法:

    網頁版 9

    import { getAuth, linkWithCredential } from "firebase/auth";
    
    const auth = getAuth();
    linkWithCredential(auth.currentUser, credential)
      .then((usercred) => {
        const user = usercred.user;
        console.log("Account linking success", user);
      }).catch((error) => {
        console.log("Account linking error", error);
      });

    網頁版 8

    auth.currentUser.linkWithCredential(credential)
      .then((usercred) => {
        var user = usercred.user;
        console.log("Account linking success", user);
      }).catch((error) => {
        console.log("Account linking error", error);
      });

    要將呼叫linkWithCredential如果憑據已鏈接到其他用戶帳戶將失敗。在這種情況下,您必鬚根據您的應用程序處理合併帳戶和關聯數據(請參見上面的示例)。

您可以從帳戶中取消身份驗證提供程序的鏈接,以便用戶無法再使用該提供程序登錄。

要取消從用戶帳戶一個auth提供商,通過提供者ID發送到unlink方法。你可以鏈接到來自用戶的身份驗證供應商的供應商ID的providerData財產。

網頁版 9

import { getAuth, unlink } from "firebase/auth";

const auth = getAuth();
unlink(auth.currentUser, providerId).then(() => {
  // Auth provider unlinked from account
  // ...
}).catch((error) => {
  // An error happened
  // ...
});

網頁版 8

user.unlink(providerId).then(() => {
  // Auth provider unlinked from account
  // ...
}).catch((error) => {
  // An error happened
  // ...
});