How to Validate Google Sign-In ID Tokens in Go Using the Official Library?

Validating Google Sign-In ID Tokens in Go: Using the Official Library

In the Go backend, validating Google sign-in ID tokens is straightforward with the official idtoken library.

To start, install the library:

go get google.golang.org/api/idtoken

Then, you can validate the token with a single line of code:

payload, err := idtoken.Validate(context.Background(), tokenString, audience)
if err != nil {
    panic(err)
}

Replace tokenString with the ID token received from the client and audience with your web application's client ID. The payload object will contain the validated claims, such as:

• aud: Your web application client ID
• azp: Your Android application client ID
• email: Authenticated user email
• email_verified: Email verification status
• exp: Token expiration timestamp
• family_name: Authenticated user's last name
• given_name: Authenticated user's first name
• iat: Token issuance timestamp
• iss: Issuer (expected to be either accounts.google.com or https://accounts.google.com)
• locale: User's preferred language
• name: Authenticated user's full name
• picture: User's profile picture URL
• sub: Unique Google Account ID

This method provides a simple and efficient way to validate ID tokens without introducing potential latency or network errors associated with using the token info endpoint.

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