com.adobe.granite.auth.oauth.AccessTokenProvider Maven / Gradle / Ivy

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package com.adobe.granite.auth.oauth;

import java.io.IOException;
import java.util.Map;

import org.osgi.annotation.versioning.ProviderType;
import com.adobe.granite.crypto.CryptoException;
import org.apache.sling.api.resource.ResourceResolver;

/**
 * Interface for an OAuth 2.0 access token provider using Authorization Grants as defined in the Assertion Framework
 * for OAuth 2.0 Client Authentication and Authorization Grants
 * (see RFC 7523).
 *
 * @see AccessTokenRequestCustomizer
 *
 * @since 3.1
 */
@ProviderType
public interface AccessTokenProvider {

    /**
     * Return a valid access token or throws an exception. A new access token is obtained from the authorization server
     * if needed, by generating a JWT and using it as authorization grant. Custom claims may be added via the
     * {@code claim} parameter. The custom claims do override the claims computed by a {@code AccessTokenProvider}
     * implementation.
     *
     * An implementation may or may not reuse the access tokens.
     *
     * @param resolver The resource resolver to access the user associated to the {@code userId}
     * @param userId The user identifier which has access to the required asymmetric cryptographic material
     * @param claims An optional map of JWT claims that overrides the claims computed by a {@code AccessTokenProvider}
     *               implementation. Providing an empty map or {@code null} uses the default
     *               {@code AccessTokenProvider} implementation claims
     * @return A valid JWT access token or throws an Exception (does not return {@code null})
     * @throws CryptoException If an error occurred while generating/signing the JWT claim
     * @throws IOException If an error occurred while communicating with the authorization server
     * @throws NullPointerException If the {@code resolver} or the {@code userId} is {@code null}
     */
    String getAccessToken(ResourceResolver resolver, String userId, Map claims)
            throws CryptoException, IOException, NullPointerException;

}