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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.jackson2;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.util.StdConverter;

import org.springframework.security.oauth2.core.AuthorizationGrantType;
import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationRequest;
import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationRequest.Builder;

/**
 * A {@code JsonDeserializer} for {@link OAuth2AuthorizationRequest}.
 *
 * @author Joe Grandja
 * @since 5.3
 * @see OAuth2AuthorizationRequest
 * @see OAuth2AuthorizationRequestMixin
 */
final class OAuth2AuthorizationRequestDeserializer extends JsonDeserializer {

	private static final StdConverter AUTHORIZATION_GRANT_TYPE_CONVERTER = new StdConverters.AuthorizationGrantTypeConverter();

	@Override
	public OAuth2AuthorizationRequest deserialize(JsonParser parser, DeserializationContext context)
			throws IOException {
		ObjectMapper mapper = (ObjectMapper) parser.getCodec();
		JsonNode root = mapper.readTree(parser);
		return deserialize(parser, mapper, root);
	}

	private OAuth2AuthorizationRequest deserialize(JsonParser parser, ObjectMapper mapper, JsonNode root)
			throws JsonParseException {
		AuthorizationGrantType authorizationGrantType = AUTHORIZATION_GRANT_TYPE_CONVERTER
				.convert(JsonNodeUtils.findObjectNode(root, "authorizationGrantType"));
		Builder builder = getBuilder(parser, authorizationGrantType);
		builder.authorizationUri(JsonNodeUtils.findStringValue(root, "authorizationUri"));
		builder.clientId(JsonNodeUtils.findStringValue(root, "clientId"));
		builder.redirectUri(JsonNodeUtils.findStringValue(root, "redirectUri"));
		builder.scopes(JsonNodeUtils.findValue(root, "scopes", JsonNodeUtils.STRING_SET, mapper));
		builder.state(JsonNodeUtils.findStringValue(root, "state"));
		builder.additionalParameters(
				JsonNodeUtils.findValue(root, "additionalParameters", JsonNodeUtils.STRING_OBJECT_MAP, mapper));
		builder.authorizationRequestUri(JsonNodeUtils.findStringValue(root, "authorizationRequestUri"));
		builder.attributes(JsonNodeUtils.findValue(root, "attributes", JsonNodeUtils.STRING_OBJECT_MAP, mapper));
		return builder.build();
	}

	private OAuth2AuthorizationRequest.Builder getBuilder(JsonParser parser,
			AuthorizationGrantType authorizationGrantType) throws JsonParseException {
		if (AuthorizationGrantType.AUTHORIZATION_CODE.equals(authorizationGrantType)) {
			return OAuth2AuthorizationRequest.authorizationCode();
		}
		if (AuthorizationGrantType.IMPLICIT.equals(authorizationGrantType)) {
			return OAuth2AuthorizationRequest.implicit();
		}
		throw new JsonParseException(parser, "Invalid authorizationGrantType");
	}

}