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KeyCloak AuthZ: Client API
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/*
 * Copyright 2023 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.keycloak.protocol.oidc.client.authentication;

import java.util.Map;

import org.keycloak.representations.adapters.config.AdapterConfig;

/**
 * The simple SPI for authenticating clients/applications . It's used by adapter during all OIDC backchannel requests to Keycloak server
 * (codeToToken exchange, refresh token or backchannel logout) . You can also use it in your application during direct access grants or service account request
 * (See the service-account example from Keycloak demo for more info)
 *
 * When you implement this SPI on the adapter (application) side, you also need to implement org.keycloak.authentication.ClientAuthenticator on the server side,
 * so your server is able to authenticate client
 *
 * You must specify a file
 * META-INF/services/org.keycloak.protocol.oidc.client.authentication.ClientCredentialsProvider in the WAR that this class is contained in (or in the JAR that is attached to the WEB-INF/lib or as jboss module
 * if you want to share the implementation among more WARs).
 *
 * NOTE: The SPI is not finished and method signatures are still subject to change in future versions (for example to support
 * authentication with client certificate)
 *
 * @author Marek Posolda
 */
public interface ClientCredentialsProvider {

    /**
     * Return the ID of the provider. Use this ID in the keycloak.json configuration as the subelement of the "credentials" element
     *
     * For example if your provider has ID "kerberos-keytab" , use the configuration like this in keycloak.json
     *
     * "credentials": {
     *
     *     "kerberos-keytab": {
     *         "keytab": "/tmp/foo"
     *     }
     * }
     *
     * @return
     */
    String getId();

    /**
     * Called by adapter during deployment of your application. You can for example read configuration and init your authenticator here
     *
     * @param adapterConfig the adapter configuration
     * @param config the configuration of your provider read from keycloak.json . For the kerberos-keytab example above, it will return map with the single key "keytab" with value "/tmp/foo"
     */
    void init(AdapterConfig adapterConfig, Object config);

    /**
     * Called every time adapter needs to perform backchannel request
     *
     * @param adapterConfig Fully resolved deployment
     * @param requestHeaders You should put any HTTP request headers you want to use for authentication of client. These headers will be attached to the HTTP request sent to Keycloak server
     * @param formParams You should put any request parameters you want to use for authentication of client. These parameters will be attached to the HTTP request sent to Keycloak server
     */
    void setClientCredentials(AdapterConfig adapterConfig, Map requestHeaders, Map formParams);
}