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Use API & SDK to authenticate

Update Time: 2025-02-18 09:00:47
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In the previous guide, you have learned how to use the login page hosted by Authing and the embedded login component to implement the login and registration process. Not only that, we also provide HTTP APIs in two forms, RESTful and GraphQL, and SDKs in more than ten different languages and frameworks. You can flexibly build the authentication process you need based on combining these API & SDK resources.

Choose the SDK you are familiar with

Authing also supports SDKs in various languages ​​such as Java, JavaScript/Node.js, Python, PHP, C#, Swift, Go, Ruby, WeChat applet, etc. You can choose the SDK you are familiar with:

Initialize SDK

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Use SDK to authenticate users

Take the SMS code login (if the user account does not exist, an account will be created first) as an example:

First, send a SMS verification code:

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And then, use the SMS code to login.

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After successfully logging in, you can get the user's information. The token field in user information is the identity credential. In the following steps, you need to carry it in requests when you want to access back-end resources. The back end will verify this token.

Verify user token

The token field of the user information is a standard OIDC IdToken. You can use the Application ID and Secret to validate this token on the backend.

An example of token is like this:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.SNyGBffF-zBqDQFINGxUJZrWSAADHQhbEOsKvnH4SLg

  
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You can decode this IdToken in this website (opens new window):

Basically all languages provide libraries for validating IdToken. You can choose the language you are familiar with:

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If the validation is successful, you can get the user information of the id_token, where the sub field is the user ID, and the aud field is the application ID. You can click here to understand the detailed definition of each field of IdToken.

Next

After identifying the user, you may also need to perform privilege management on the user to determine whether the user has privilege to operate on this API.