google-auth-id-token-verifier

Golang port of OAuth2Client.prototype.verifyIdToken from google-auth-library-nodejs

Verify idtoken without making http request to tokeninfo API.

Usage

import (
    "github.com/futurenda/google-auth-id-token-verifier"
)

v := googleAuthIDTokenVerifier.Verifier{}
aud := "xxxxxx-yyyyyyy.apps.googleusercontent.com"
err := v.VerifyIDToken(TOKEN, []string{
    aud,
})
if err == nil {
    claimSet, err := googleAuthIDTokenVerifier.Decode(TOKEN)
    // claimSet.Iss,claimSet.Email ... (See claimset.go)
}

Features

• Fetch public key from www.googleapis.com/oauth2/v3/certs
• Respect cache-control in response from www.googleapis.com/oauth2/v3/certs
• JWT Parser
• Check Signature
• Check IssueTime, ExpirationTime with ClockSkew
• Check Issuer
• Check Audience

Deps

• golang.org/x/oauth2/jws

See also

• http://stackoverflow.com/questions/36716117/validating-google-sign-in-id-token-in-go#
• https://github.com/GoogleIdTokenVerifier/GoogleIdTokenVerifier