/*
 * Copyright (c) 2020 pig4cloud Authors. All Rights Reserved.
 *
 * 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 com.pig4cloud.pig.common.security.component;

import com.pig4cloud.pig.common.security.exception.*;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.oauth2.common.DefaultThrowableAnalyzer;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.common.exceptions.ClientAuthenticationException;
import org.springframework.security.oauth2.common.exceptions.InsufficientScopeException;
import org.springframework.security.oauth2.common.exceptions.InvalidGrantException;
import org.springframework.security.oauth2.common.exceptions.OAuth2Exception;
import org.springframework.security.oauth2.provider.error.WebResponseExceptionTranslator;
import org.springframework.security.web.util.ThrowableAnalyzer;
import org.springframework.web.HttpRequestMethodNotSupportedException;

/**
 * @author lengleng
 * @date 2019/2/1 异常处理,重写oauth 默认实现
 */
@Slf4j
public class PigWebResponseExceptionTranslator implements WebResponseExceptionTranslator {

	private ThrowableAnalyzer throwableAnalyzer = new DefaultThrowableAnalyzer();

	@Override
	@SneakyThrows
	public ResponseEntity<OAuth2Exception> translate(Exception e) {

		// Try to extract a SpringSecurityException from the stacktrace
		Throwable[] causeChain = throwableAnalyzer.determineCauseChain(e);

		Exception ase = (AuthenticationException) throwableAnalyzer
				.getFirstThrowableOfType(AuthenticationException.class, causeChain);
		if (ase != null) {
			return handleOAuth2Exception(new UnauthorizedException(e.getMessage(), e));
		}

		ase = (AccessDeniedException) throwableAnalyzer.getFirstThrowableOfType(AccessDeniedException.class,
				causeChain);
		if (ase != null) {
			return handleOAuth2Exception(new ForbiddenException(ase.getMessage(), ase));
		}

		ase = (InvalidGrantException) throwableAnalyzer.getFirstThrowableOfType(InvalidGrantException.class,
				causeChain);
		if (ase != null) {
			return handleOAuth2Exception(new InvalidException(ase.getMessage(), ase));
		}

		ase = (HttpRequestMethodNotSupportedException) throwableAnalyzer
				.getFirstThrowableOfType(HttpRequestMethodNotSupportedException.class, causeChain);
		if (ase != null) {
			return handleOAuth2Exception(new MethodNotAllowed(ase.getMessage(), ase));
		}

		ase = (OAuth2Exception) throwableAnalyzer.getFirstThrowableOfType(OAuth2Exception.class, causeChain);

		if (ase != null) {
			return handleOAuth2Exception((OAuth2Exception) ase);
		}

		return handleOAuth2Exception(new ServerErrorException(HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase(), e));

	}

	private ResponseEntity<OAuth2Exception> handleOAuth2Exception(OAuth2Exception e) {

		int status = e.getHttpErrorCode();
		HttpHeaders headers = new HttpHeaders();
		headers.set(HttpHeaders.CACHE_CONTROL, "no-store");
		headers.set(HttpHeaders.PRAGMA, "no-cache");
		if (status == HttpStatus.UNAUTHORIZED.value() || (e instanceof InsufficientScopeException)) {
			headers.set(HttpHeaders.WWW_AUTHENTICATE,
					String.format("%s %s", OAuth2AccessToken.BEARER_TYPE, e.getSummary()));
		}

		// 客户端异常直接返回客户端,不然无法解析
		if (e instanceof ClientAuthenticationException) {
			return new ResponseEntity<>(e, headers, HttpStatus.valueOf(status));
		}
		return new ResponseEntity<>(new PigAuth2Exception(e.getMessage(), e.getOAuth2ErrorCode()), headers,
				HttpStatus.valueOf(status));

	}

}
