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/*
 * Copyright 2002-2020 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.security.oauth2.client.endpoint;

import org.springframework.security.oauth2.client.registration.ClientRegistration;
import org.springframework.security.oauth2.core.AuthorizationGrantType;
import org.springframework.security.oauth2.core.endpoint.OAuth2AccessTokenResponse;
import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;

import java.util.Set;

/**
 * An implementation of a {@link ReactiveOAuth2AccessTokenResponseClient}
 * for the {@link AuthorizationGrantType#PASSWORD password} grant.
 * This implementation uses {@link WebClient} when requesting
 * an access token credential at the Authorization Server's Token Endpoint.
 *
 * @author Joe Grandja
 * @since 5.2
 * @see ReactiveOAuth2AccessTokenResponseClient
 * @see OAuth2PasswordGrantRequest
 * @see OAuth2AccessTokenResponse
 * @see Section 4.3.2 Access Token Request (Resource Owner Password Credentials Grant)
 * @see Section 4.3.3 Access Token Response (Resource Owner Password Credentials Grant)
 */
public final class WebClientReactivePasswordTokenResponseClient extends
		AbstractWebClientReactiveOAuth2AccessTokenResponseClient {

	@Override
	ClientRegistration clientRegistration(OAuth2PasswordGrantRequest grantRequest) {
		return grantRequest.getClientRegistration();
	}

	@Override
	Set scopes(OAuth2PasswordGrantRequest grantRequest) {
		return grantRequest.getClientRegistration().getScopes();
	}

	@Override
	BodyInserters.FormInserter populateTokenRequestBody(
			OAuth2PasswordGrantRequest grantRequest,
			BodyInserters.FormInserter body) {
		return super.populateTokenRequestBody(grantRequest, body)
			.with(OAuth2ParameterNames.USERNAME, grantRequest.getUsername())
			.with(OAuth2ParameterNames.PASSWORD, grantRequest.getPassword());
	}

}