[英]How can I check if user exists in Firebase?
I finally got my authentication to work in terms of creating users and logging in and out.我终于让我的身份验证在创建用户和登录和注销方面发挥作用。 But now, I want to implement something that checks if the user already exists in Firebase.
但是现在,我想实现一些检查用户是否已经存在于 Firebase 的东西。 I've looked it up but can't seem to find a concrete answer.
我查了一下,但似乎找不到具体的答案。
For example, if my email address is: abc12@gmail.com and someone else tries to signup with the same email address, how do I tell them it's already taken?例如,如果我的电子邮件地址是:abc12@gmail.com 并且其他人尝试使用相同的电子邮件地址注册,我如何告诉他们它已被占用?
login(e) {
e.preventDefault();
fire.auth().signInWithEmailAndPassword(this.state.email, this.state.password)
.then((u) => {
}).catch((error) => {
console.log(error);
});
}
signup(e) {
e.preventDefault();
fire.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
.then((u) => {
}).catch((error) => {
console.log(error);
});
}
The error that is returned from method createUserWithEmailAndPassword
has a code
property.从方法
createUserWithEmailAndPassword
返回的错误具有code
属性。 Per the documentation the error code
auth/email-already-in-use :根据文档,错误
code
auth/email-already-in-use :
Thrown if there already exists an account with the given email address.
如果已存在具有给定电子邮件地址的帐户,则抛出。
At very minimum you can utilize conditional statements such as if
/ else
or switch
to check for that code
and display/log/dispatch/etc a message or code to the user:至少,您可以使用条件语句,例如
if
/ else
或switch
来检查该code
并向用户显示/记录/调度/等消息或代码:
fire.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
.then(u => {})
.catch(error => {
switch (error.code) {
case 'auth/email-already-in-use':
console.log(`Email address ${this.state.email} already in use.`);
break;
case 'auth/invalid-email':
console.log(`Email address ${this.state.email} is invalid.`);
break;
case 'auth/operation-not-allowed':
console.log(`Error during sign up.`);
break;
case 'auth/weak-password':
console.log('Password is not strong enough. Add additional characters including special characters and numbers.');
break;
default:
console.log(error.message);
break;
}
});
Hopefully that helps!希望这有帮助!
更简单的答案:
const uidExists = auth().getUser(uid).then(() => true).catch(() => false))
const emailExists = auth().getUserByEmail(email).then(() => true).catch(() => false))
from firebase_admin import auth
user = auth.get_user_by_email(email)
print('Successfully fetched user data exists: {0}'.format(user.uid))
In python admin server在 python 管理服务器中
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