image_url_encoder.h

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/*
 * 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.
 */

#ifndef NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_IMAGE_URL_ENCODER_H_

#include "net/instaweb/rewriter/cached_result.pb.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/gtest_prod.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/util/url_segment_encoder.h"

namespace net_instaweb {

class GoogleUrl;
class RequestProperties;
class RewriteDriver;
class RewriteOptions;
class MessageHandler;

class ImageUrlEncoder : public UrlSegmentEncoder {
 public:
  ImageUrlEncoder() {}
  virtual ~ImageUrlEncoder();

  virtual void Encode(const StringVector& urls,
                      const ResourceContext* dim,
                      GoogleString* rewritten_url) const;

  virtual bool Decode(const StringPiece& url_segment,
                      StringVector* urls,
                      ResourceContext* dim,
                      MessageHandler* handler) const;

  static void SetLibWebpLevel(const RewriteOptions& options,
                              const RequestProperties& request_properties,
                              ResourceContext* resource_context);

  static void SetWebpAndMobileUserAgent(const RewriteDriver& driver,
                                        ResourceContext* context);

  static bool IsWebpRewrittenUrl(const GoogleUrl& gurl);

  static void SetSmallScreen(const RewriteDriver& driver,
                             ResourceContext* context);

  static GoogleString CacheKeyFromResourceContext(
      const ResourceContext& resource_context);

  static bool HasDimensions(const ResourceContext& data) {
    return (data.has_desired_image_dims() &&
            HasValidDimensions(data.desired_image_dims()));
  }

  static bool HasValidDimensions(const ImageDim& dims) {
    return (dims.has_width() && dims.has_height());
  }

  static bool HasDimension(const ResourceContext& data) {
    return (data.has_desired_image_dims() &&
            HasValidDimension(data.desired_image_dims()));
  }

  static bool HasValidDimension(const ImageDim& dims) {
    return (dims.has_width() || dims.has_height());
  }

  static bool AllowVaryOnUserAgent(const RewriteOptions& options,
                                   const RequestProperties& request_properties);

  static bool AllowVaryOnAccept(const RewriteOptions& options,
                                const RequestProperties& request_properties);

 private:
  
};

}  

#endif