src/net/instaweb/rewriter/data_url_input_resource.cc

/*
 * Copyright 2010 Google Inc.
 *
 * 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.
 */

// Author: jmaessen@google.com (Jan Maessen)

#include "net/instaweb/rewriter/public/data_url_input_resource.h"

#include "net/instaweb/http/public/http_value.h"
#include "net/instaweb/rewriter/cached_result.pb.h"
#include "net/instaweb/rewriter/public/rewrite_driver.h"
#include "net/instaweb/rewriter/public/server_context.h"
#include "pagespeed/kernel/http/content_type.h"
#include "pagespeed/kernel/http/data_url.h"
#include "pagespeed/kernel/http/http_names.h"
#include "pagespeed/kernel/http/response_headers.h"

namespace net_instaweb {

DataUrlInputResource::DataUrlInputResource(const GoogleString* url,
                                           Encoding encoding,
                                           const ContentType* type,
                                           const StringPiece& encoded_contents,
                                           const RewriteDriver* driver)
    : Resource(driver, type),
      url_(url),
      encoding_(encoding),
      encoded_contents_(encoded_contents) {
  // Make sure we auto-load.
  if (DecodeDataUrlContent(encoding_, encoded_contents_, &decoded_contents_) &&
      value_.Write(decoded_contents_,
                   driver->server_context()->message_handler())) {
    // Note that we do not set caching headers here.
    // This is because they are expensive to compute; and should not be used
    // for this resource anyway, as it has UseHttpCache() false, and provides
    // IsValidAndCacheable() and an ALWAYS_VALID output of
    // FillInPartitionInputInfo.
    response_headers_.set_major_version(1);
    response_headers_.set_minor_version(1);
    response_headers_.SetStatusAndReason(HttpStatus::kOK);
    response_headers_.Add(HttpAttributes::kContentType, type_->mime_type());
    value_.SetHeaders(&response_headers_);
  }
}

DataUrlInputResource::~DataUrlInputResource() {}

// data: URLs never expire. So we only check that it was decoded correctly.
bool DataUrlInputResource::IsValidAndCacheable() const {
  return response_headers_.status_code() == HttpStatus::kOK;
}

void DataUrlInputResource::FillInPartitionInputInfo(
    HashHint include_content_hash, InputInfo* input) {
  input->set_type(InputInfo::ALWAYS_VALID);
}

void DataUrlInputResource::LoadAndCallback(
    NotCacheablePolicy not_cacheable_policy,
    const RequestContextPtr& request_context,
    AsyncCallback* callback) {
  callback->Done(false /* lock_failure */, loaded());
}

}  // namespace net_instaweb