/*
 * 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.
 */


#include "ngx_caching_headers.h"
#include "ngx_list_iterator.h"

#include "ngx_pagespeed.h"

namespace net_instaweb {

bool NgxCachingHeaders::Lookup(const StringPiece& key,
                               StringPieceVector* values) {
  ngx_table_elt_t* header;
  NgxListIterator it(&(request_->headers_out.headers.part));
  while ((header = it.Next()) != NULL) {
    if (header->hash != 0 && key == str_to_string_piece(header->key)) {
      // This will be called multiple times if there are multiple headers with
      // this name.  Each time it will append to values.
      SplitStringPieceToVector(str_to_string_piece(header->value), ",", values,
                               true /* omit empty strings */);
    }
  }

  if (values->size() == 0) {
    // No header found with this name.
    return false;
  }

  for (int i = 0, n = values->size(); i < n; ++i) {
    TrimWhitespace(&((*values)[i]));
  }

  return true;
}

}  // namespace net_instaweb