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package com.github.scribejava.apis;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.ParseException;
import java.util.Collections;
import java.util.Map;
import java.util.Optional;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.jwk.source.JWKSource;
import com.nimbusds.jose.jwk.source.RemoteJWKSet;
import com.nimbusds.jose.proc.BadJOSEException;
import com.nimbusds.jose.proc.JWSKeySelector;
import com.nimbusds.jose.proc.JWSVerificationKeySelector;
import com.nimbusds.jose.proc.SecurityContext;
import com.nimbusds.jwt.proc.ConfigurableJWTProcessor;
import com.nimbusds.jwt.proc.DefaultJWTClaimsVerifier;
import com.nimbusds.jwt.proc.DefaultJWTProcessor;
public class GoogleTokenVerifier {
public static Optional<String> validateToken(String clientId, String idToken) {
// Create a JWT processor for the access tokens
ConfigurableJWTProcessor<SecurityContext> jwtProcessor = new DefaultJWTProcessor<>();
// The public RSA keys to validate the signatures will be sourced from the
// OAuth 2.0 server's JWK set, published at a well-known URL. The RemoteJWKSet
// object caches the retrieved keys to speed up subsequent look-ups and can
// also handle key-rollover
JWKSource<SecurityContext> keySource =
null;
try {
keySource = new RemoteJWKSet<>(new URL("https://www.googleapis.com/oauth2/v3/certs"));
} catch (MalformedURLException e) {
return Optional.empty();
}
// The expected JWS algorithm of the access tokens (agreed out-of-band)
JWSAlgorithm expectedJWSAlg = JWSAlgorithm.RS256;
// Configure the JWT processor with a key selector to feed matching public
// RSA keys sourced from the JWK set URL
JWSKeySelector<SecurityContext> keySelector =
new JWSVerificationKeySelector<>(expectedJWSAlg, keySource);
jwtProcessor.setJWSKeySelector(keySelector);
// Set the required JWT claims for access tokens issued by the server
jwtProcessor.setJWTClaimsSetVerifier(new DefaultJWTClaimsVerifier<>(Collections.singleton(clientId), null, null, null));
// Process the token
Map<String, Object> claimsSet;
try {
claimsSet = jwtProcessor.process(idToken, null).toJSONObject();
} catch (BadJOSEException | JOSEException | ParseException e) {
return Optional.empty();
}
String email = (String)claimsSet.get("email");
boolean verified = claimsSet.get("email_verified").equals(true);
return verified ? Optional.of(email) : Optional.empty();
}
}
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