/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.servicecomb.authentication.edge;

import org.apache.servicecomb.authentication.util.Constants;
import org.apache.servicecomb.core.Handler;
import org.apache.servicecomb.core.Invocation;
import org.apache.servicecomb.foundation.common.utils.BeanUtils;
import org.apache.servicecomb.swagger.invocation.AsyncResponse;
import org.apache.servicecomb.swagger.invocation.exception.InvocationException;
import org.springframework.security.jwt.Jwt;
import org.springframework.security.jwt.JwtHelper;
import org.springframework.security.jwt.crypto.sign.InvalidSignatureException;


public class AuthHandler implements Handler {
  @Override
  public void handle(Invocation invocation, AsyncResponse asyncResponse) throws Exception {
    String token = invocation.getContext(Constants.CONTEXT_HEADER_AUTHORIZATION);
    if (token == null) {
      asyncResponse.consumerFail(new InvocationException(403, "forbidden", "not authenticated"));
      return;
    }
    Jwt jwt = JwtHelper.decode(token);
    try {
      jwt.verifySignature(BeanUtils.getBean("authSignerVerifier"));
    } catch (InvalidSignatureException e) {
      asyncResponse.consumerFail(new InvocationException(403, "forbidden", "not authenticated"));
      return;
    }
    invocation.next(asyncResponse);
  }
}