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Google Api eXtensions for Java
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/*
 * Copyright 2022 Google LLC
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google LLC nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.google.api.gax.httpjson;

import com.google.api.gax.httpjson.ForwardingHttpJsonClientCall.SimpleForwardingHttpJsonClientCall;
import com.google.common.collect.ImmutableMap;
import java.util.Map;

/**
 * An interceptor to handle custom headers.
 *
 * Package-private for internal usage.
 */
class HttpJsonHeaderInterceptor implements HttpJsonClientInterceptor {

  private final Map staticHeaders;

  public HttpJsonHeaderInterceptor(Map staticHeaders) {
    this.staticHeaders = staticHeaders;
  }

  @Override
  public  HttpJsonClientCall interceptCall(
      ApiMethodDescriptor method,
      final HttpJsonCallOptions callOptions,
      HttpJsonChannel next) {
    HttpJsonClientCall call = next.newCall(method, callOptions);
    return new SimpleForwardingHttpJsonClientCall(call) {
      @Override
      public void start(
          HttpJsonClientCall.Listener responseListener, HttpJsonMetadata headers) {
        Map mergedHeaders =
            ImmutableMap.builder()
                .putAll(headers.getHeaders())
                .putAll(staticHeaders)
                .build();

        super.start(responseListener, headers.toBuilder().setHeaders(mergedHeaders).build());
      }
    };
  }
}