如何捕获Firebase Auth特定的异常

Question

使用Firebase,如何捕获特定异常并优雅地告诉用户？例如:

FirebaseAuthInvalidCredentialsException:电子邮件地址格式错误.

我正在使用下面的代码使用电子邮件和密码注册用户,但我不是那么高级的java.

mAuth.createUserWithEmailAndPassword(email, pwd)
    .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {

    @Override
    public void onComplete(@NonNull Task<AuthResult> task) {
        if (!task.isSuccessful()) {
            //H.toast(c, task.getException().getMessage());
            Log.e("Signup Error", "onCancelled", task.getException());
        } else {
            FirebaseUser user = mAuth.getCurrentUser();
            String uid = user.getUid();
        }
    }    
});

Answer 1

您可以抛出task.getExceptiontry块内返回的Exception,并捕获您正在使用的方法可能抛出的每种类型的Exception.

以下是OnCompleteListener该createUserWithEmailAndPassword方法的示例.

if(!task.isSuccessful()) {
    try {
        throw task.getException();
    } catch(FirebaseAuthWeakPasswordException e) {
        mTxtPassword.setError(getString(R.string.error_weak_password));
        mTxtPassword.requestFocus();
    } catch(FirebaseAuthInvalidCredentialsException e) {
        mTxtEmail.setError(getString(R.string.error_invalid_email));
        mTxtEmail.requestFocus();
    } catch(FirebaseAuthUserCollisionException e) {
        mTxtEmail.setError(getString(R.string.error_user_exists));
        mTxtEmail.requestFocus();
    } catch(Exception e) {
        Log.e(TAG, e.getMessage());
    }
}

Answer 2

除了@ pdegand59回答之外,我在Firebase库中发现了一些错误代码并在Android上进行了测试(返回的错误代码).希望这会有所帮助,问候.

 ("ERROR_INVALID_CUSTOM_TOKEN", "The custom token format is incorrect. Please check the documentation."));
    ("ERROR_CUSTOM_TOKEN_MISMATCH", "The custom token corresponds to a different audience."));
    ("ERROR_INVALID_CREDENTIAL", "The supplied auth credential is malformed or has expired."));
    ("ERROR_INVALID_EMAIL", "The email address is badly formatted."));
    ("ERROR_WRONG_PASSWORD", "The password is invalid or the user does not have a password."));
    ("ERROR_USER_MISMATCH", "The supplied credentials do not correspond to the previously signed in user."));
    ("ERROR_REQUIRES_RECENT_LOGIN", "This operation is sensitive and requires recent authentication. Log in again before retrying this request."));
    ("ERROR_ACCOUNT_EXISTS_WITH_DIFFERENT_CREDENTIAL", "An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address."));
    ("ERROR_EMAIL_ALREADY_IN_USE", "The email address is already in use by another account."));
    ("ERROR_CREDENTIAL_ALREADY_IN_USE", "This credential is already associated with a different user account."));
    ("ERROR_USER_DISABLED", "The user account has been disabled by an administrator."));
    ("ERROR_USER_TOKEN_EXPIRED", "The user\'s credential is no longer valid. The user must sign in again."));
    ("ERROR_USER_NOT_FOUND", "There is no user record corresponding to this identifier. The user may have been deleted."));
    ("ERROR_INVALID_USER_TOKEN", "The user\'s credential is no longer valid. The user must sign in again."));
    ("ERROR_OPERATION_NOT_ALLOWED", "This operation is not allowed. You must enable this service in the console."));
    ("ERROR_WEAK_PASSWORD", "The given password is invalid."));

Answer 3

使用 Kotlin 的解决方案

 fun signInWithEmail(email: String, passKey: String) {
    FirebaseAuth.getInstance().signInWithEmailAndPassword(email, passKey).addOnSuccessListener {
        it.user?.let {
            authResultOperation.postValue(AuthResultOperation.OnSuccessSignIn)
        }
    }.addOnFailureListener {
        val errorCode = (it.exception as FirebaseAuthException).errorCode
        val errorMessage = authErrors[errorCode] ?: R.string.error_login_default_error
        Toast.makeText(context, context.getString(errorMessage),Toast.LENGTH_LONG).show()
    }
}

说明：基本上它只是一个将 firebase 错误代码与自定义字符串资源相匹配的映射。

val authErrors = mapOf("ERROR_INVALID_CUSTOM_TOKEN" to R.string.error_login_custom_token,
        "ERROR_CUSTOM_TOKEN_MISMATCH" to R.string.error_login_custom_token_mismatch,
        "ERROR_INVALID_CREDENTIAL" to R.string.error_login_credential_malformed_or_expired,
        "ERROR_INVALID_EMAIL" to R.string.error_login_invalid_email,
        "ERROR_WRONG_PASSWORD" to R.string.error_login_wrong_password,
        "ERROR_USER_MISMATCH" to R.string.error_login_user_mismatch,
        "ERROR_REQUIRES_RECENT_LOGIN" to R.string.error_login_requires_recent_login,
        "ERROR_ACCOUNT_EXISTS_WITH_DIFFERENT_CREDENTIAL" to R.string.error_login_accounts_exits_with_different_credential,
        "ERROR_EMAIL_ALREADY_IN_USE" to  R.string.error_login_email_already_in_use,
        "ERROR_CREDENTIAL_ALREADY_IN_USE" to R.string.error_login_credential_already_in_use,
        "ERROR_USER_DISABLED" to R.string.error_login_user_disabled,
        "ERROR_USER_TOKEN_EXPIRED" to R.string.error_login_user_token_expired,
        "ERROR_USER_NOT_FOUND" to R.string.error_login_user_not_found,
        "ERROR_INVALID_USER_TOKEN" to R.string.error_login_invalid_user_token,
        "ERROR_OPERATION_NOT_ALLOWED" to R.string.error_login_operation_not_allowed,
        "ERROR_WEAK_PASSWORD" to R.string.error_login_password_is_weak)

字符串资源（可以根据自己的需求随意更改）

  <resources>
    <string name="error_login_custom_token">The custom token format is incorrect. Please check the documentation.</string>
    <string name="error_login_custom_token_mismatch">The custom token corresponds to a different audience.</string>
    <string name="error_login_credential_malformed_or_expired">The supplied auth credential is malformed or has expired.</string>
    <string name="error_login_invalid_email">The email address is badly formatted.</string>
    <string name="error_login_wrong_password">The password is invalid or the user does not have a password.</string>
    <string name="error_login_user_mismatch">The supplied credentials do not correspond to the previously signed in user.</string>
    <string name="error_login_requires_recent_login">This operation is sensitive and requires recent authentication. Log in again before retrying this request.</string>
    <string name="error_login_accounts_exits_with_different_credential">An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address.</string>
    <string name="error_login_email_already_in_use">The email address is already in use by another account.</string>
    <string name="error_login_credential_already_in_use">This credential is already associated with a different user account.</string>
    <string name="error_login_user_disabled">The user account has been disabled by an administrator.</string>
    <string name="error_login_user_not_found">There is no user record corresponding to this identifier. The user may have been deleted.</string>
    <string name="error_login_operation_not_allowed">This operation is not allowed. You must enable this service in the console.</string>
    <string name="error_login_password_is_weak">The given password is invalid.</string>
    <string name="error_login_user_token_expired">The user\'s credential is no longer valid. The user must sign in again</string>
    <string name="error_login_invalid_user_token">The user\'s credential is no longer valid. The user must sign in again.</string>
</resources>

Answer 4

((FirebaseAuthException)task.getException()).getErrorCode()如果这是格式错误的电子邮件的错误代码,您应该使用获取错误类型并正常失败.

很遗憾,我找不到Firebase使用的错误代码列表.触发异常一次,请相应地记下错误代码和代码.

Answer 5

firebase身份验证有许多例外情况.除了@kingspeech

您应该使用((FirebaseAuthException)task.getException()).getErrorCode()获取错误类型,然后switch像这样处理它:

private void loginUser(String email, String password) {

        mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {

            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {

                if (task.isSuccessful()) {

                    startActivity(new Intent(MainActivity.this, Main2Activity.class));

                } else {

                    String errorCode = ((FirebaseAuthException) task.getException()).getErrorCode();

                    switch (errorCode) {

                        case "ERROR_INVALID_CUSTOM_TOKEN":
                            Toast.makeText(MainActivity.this, "The custom token format is incorrect. Please check the documentation.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_CUSTOM_TOKEN_MISMATCH":
                            Toast.makeText(MainActivity.this, "The custom token corresponds to a different audience.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_INVALID_CREDENTIAL":
                            Toast.makeText(MainActivity.this, "The supplied auth credential is malformed or has expired.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_INVALID_EMAIL":
                            Toast.makeText(MainActivity.this, "The email address is badly formatted.", Toast.LENGTH_LONG).show();
                            etEmail.setError("The email address is badly formatted.");
                            etEmail.requestFocus();
                            break;

                        case "ERROR_WRONG_PASSWORD":
                            Toast.makeText(MainActivity.this, "The password is invalid or the user does not have a password.", Toast.LENGTH_LONG).show();
                            etPassword.setError("password is incorrect ");
                            etPassword.requestFocus();
                            etPassword.setText("");
                            break;

                        case "ERROR_USER_MISMATCH":
                            Toast.makeText(MainActivity.this, "The supplied credentials do not correspond to the previously signed in user.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_REQUIRES_RECENT_LOGIN":
                            Toast.makeText(MainActivity.this, "This operation is sensitive and requires recent authentication. Log in again before retrying this request.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_ACCOUNT_EXISTS_WITH_DIFFERENT_CREDENTIAL":
                            Toast.makeText(MainActivity.this, "An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_EMAIL_ALREADY_IN_USE":
                            Toast.makeText(MainActivity.this, "The email address is already in use by another account.   ", Toast.LENGTH_LONG).show();
                            etEmail.setError("The email address is already in use by another account.");
                            etEmail.requestFocus();
                            break;

                        case "ERROR_CREDENTIAL_ALREADY_IN_USE":
                            Toast.makeText(MainActivity.this, "This credential is already associated with a different user account.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_USER_DISABLED":
                            Toast.makeText(MainActivity.this, "The user account has been disabled by an administrator.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_USER_TOKEN_EXPIRED":
                            Toast.makeText(MainActivity.this, "The user\\'s credential is no longer valid. The user must sign in again.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_USER_NOT_FOUND":
                            Toast.makeText(MainActivity.this, "There is no user record corresponding to this identifier. The user may have been deleted.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_INVALID_USER_TOKEN":
                            Toast.makeText(MainActivity.this, "The user\\'s credential is no longer valid. The user must sign in again.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_OPERATION_NOT_ALLOWED":
                            Toast.makeText(MainActivity.this, "This operation is not allowed. You must enable this service in the console.", Toast.LENGTH_LONG).show();
                            break;

                        case "ERROR_WEAK_PASSWORD":
                            Toast.makeText(MainActivity.this, "The given password is invalid.", Toast.LENGTH_LONG).show();
                            etPassword.setError("The password is invalid it must 6 characters at least");
                            etPassword.requestFocus();
                            break;

                    }
                }
            }
        });
    }

Answer 6

如果您只是想向用户显示消息,则此方法有效.简约优雅:

if (!task.isSuccessful()) {
    Log.w(TAG, "signInWithEmail:failed", task.getException());
    Toast.makeText(LoginActivity.this, "User Authentication Failed: " + task.getException().getMessage(), Toast.LENGTH_SHORT).show();
}

似乎.getMessage()方法已经为我们将异常转换为可用的格式,我们所要做的就是向用户显示某个地方.

(这是我的第一个评论,建设性的批评请)

Answer 7

您可以使用 steve-guidetti 或 pdegand59 方法。我使用了 steve-guidetti 的方法（缺少两个例外）

对于所有可能的例外，请在下面找到参考。

它在这里有很好的记录。

https://firebase.google.com/docs/reference/js/firebase.auth.Auth

搜索“createUserWithEmailAndPassword”并找到

错误代码

身份验证/电子邮件已在使用中

Thrown if there already exists an account with the given email address. 

身份验证/无效电子邮件

Thrown if the email address is not valid.

授权/操作不允许

Thrown if email/password accounts are not enabled. Enable email/password accounts in the Firebase Console, under the Auth tab.

身份验证/弱密码

Thrown if the password is not strong enough. 

对于所有五个例外：检查这里

https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseAuthException

在这里您可以找到 5 种不同类型的 AuthException。4 个已知的直接子类和 1 个间接子类

您可以使用 steve-guidetti 或 pdegand59 方法。