package com.nimbusds.oauth2.sdk;
import java.util.LinkedHashMap;
import java.util.Map;
import net.jcip.annotations.Immutable;
import com.nimbusds.jwt.JWT;
import com.nimbusds.jwt.JWTParser;
/**
* JWT bearer grant. Used in access token requests with a JSON Web Token (JWT),
* such an OpenID Connect ID token.
*
* <p>Related specifications:
*
* <ul>
* <li>JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication and
* Authorization Grants (draft-ietf-oauth-jwt-bearer-10), section-2.1.
* <li>Assertion Framework for OAuth 2.0 Client Authentication and
* Authorization Grants (draft-ietf-oauth-assertions-16), section 4.1.
* </ul>
*/
@Immutable
public class JWTBearerGrant extends AssertionGrant {
/**
* The grant type.
*/
public static final GrantType GRANT_TYPE = GrantType.JWT_BEARER;
/**
* The JWT assertion.
*/
private final JWT assertion;
/**
* Creates a new JSON Web Token (JWT) bearer assertion grant.
*
* @param assertion The JSON Web Token (JWT) assertion. Must not be
* {@code null}.
*/
public JWTBearerGrant(final JWT assertion) {
super(GRANT_TYPE);
if (assertion == null)
throw new IllegalArgumentException("The JWT assertion must not be null");
this.assertion = assertion;
}
/**
* Gets the JSON Web Token (JWT) bearer assertion.
*
* @return The JWT bearer assertion.
*/
public JWT getJWTAssertion() {
return assertion;
}
@Override
public String getAssertion() {
return assertion.serialize();
}
@Override
public Map<String,String> toParameters() {
Map<String,String> params = new LinkedHashMap<>();
params.put("grant_type", GRANT_TYPE.getValue());
params.put("assertion", assertion.serialize());
return params;
}
/**
* Parses a JWT bearer grant from the specified parameters.
*
* <p>Example:
*
* <pre>
* grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer
* &assertion=eyJhbGciOiJFUzI1NiJ9.eyJpc3Mi[...omitted for brevity...].
* J9l-ZhwP[...omitted for brevity...]
* </pre>
*
* @param params The parameters.
*
* @return The JWT bearer grant.
*
* @throws ParseException If parsing failed.
*/
public static JWTBearerGrant parse(final Map<String,String> params)
throws ParseException {
// Parse grant type
String grantTypeString = params.get("grant_type");
if (grantTypeString == null)
throw new ParseException("Missing \"grant_type\" parameter", OAuth2Error.INVALID_REQUEST);
if (! GrantType.parse(grantTypeString).equals(GRANT_TYPE))
throw new ParseException("The \"grant_type\" must be " + GRANT_TYPE, OAuth2Error.UNSUPPORTED_GRANT_TYPE);
// Parse JWT assertion
String assertionString = params.get("assertion");
if (assertionString == null || assertionString.trim().isEmpty())
throw new ParseException("Missing or empty \"assertion\" parameter", OAuth2Error.INVALID_REQUEST);
JWT assertion;
try {
assertion = JWTParser.parse(assertionString);
} catch (java.text.ParseException e) {
throw new ParseException("The \"assertion\" is not a JWT: " + e.getMessage(), OAuth2Error.INVALID_REQUEST, e);
}
return new JWTBearerGrant(assertion);
}
}