package com.entfrm.auth.handler;

import com.entfrm.core.security.exception.*;
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;

/**
 * @date 2018/7/8
 * 异常处理,重写oauth 默认实现
 */
@Slf4j
public class EntfrmWebResponseExceptionTranslator implements WebResponseExceptionTranslator {

    private ThrowableAnalyzer throwableAnalyzer = new DefaultThrowableAnalyzer();

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

        Throwable[] causeChain = throwableAnalyzer.determineCauseChain(e);

        Exception ase = (AuthenticationException) throwableAnalyzer.getFirstThrowableOfType(AuthenticationException.class,
                causeChain);
        //身份验证相关异常
        if (ase != null) {
            return handleOAuth2Exception(new UnauthorizedException(e.getMessage(), e));
        }

        ase = (AccessDeniedException) throwableAnalyzer
                .getFirstThrowableOfType(AccessDeniedException.class, causeChain);
        //拒绝访问异常
        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);
        //Http方法请求异常
        if (ase != null) {
            return handleOAuth2Exception(new MethodNotAllowedException(ase.getMessage(), ase));
        }

        ase = (OAuth2Exception) throwableAnalyzer.getFirstThrowableOfType(
                OAuth2Exception.class, causeChain);
        //OAuth2Exception异常
        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
        if (e instanceof ClientAuthenticationException) {
            return new ResponseEntity<>(e, headers,
                    HttpStatus.valueOf(status));
        }
        return new ResponseEntity<>(new EntfrmAuth2Exception(e.getMessage(), e.getOAuth2ErrorCode()), headers,
                HttpStatus.valueOf(status));

    }
}
