Page Speed Optimization Libraries  1.8.31.3
net/instaweb/rewriter/public/common_filter.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_COMMON_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_COMMON_FILTER_H_
00021 
00022 #include "net/instaweb/htmlparse/public/empty_html_filter.h"
00023 #include "net/instaweb/rewriter/public/resource.h"
00024 #include "net/instaweb/rewriter/public/rewrite_driver.h"
00025 #include "net/instaweb/util/public/basictypes.h"
00026 #include "net/instaweb/util/public/string.h"
00027 #include "net/instaweb/util/public/string_util.h"
00028 
00029 namespace net_instaweb {
00030 class GoogleUrl;
00031 class HtmlCharactersNode;
00032 class HtmlElement;
00033 class HtmlNode;
00034 class ResponseHeaders;
00035 class RewriteOptions;
00036 class ServerContext;
00037 
00048 class CommonFilter : public EmptyHtmlFilter {
00049  public:
00051   static const char kCreateResourceFailedDebugMsg[];
00052 
00053   explicit CommonFilter(RewriteDriver* driver);
00054   virtual ~CommonFilter();
00055 
00057 
00059   const GoogleUrl& base_url() const;
00060 
00063   const GoogleUrl& decoded_base_url() const;
00064 
00065   RewriteDriver* driver() const { return driver_; }
00066   HtmlElement* noscript_element() const { return noscript_element_; }
00067 
00081   void InsertNodeAtBodyEnd(HtmlNode* data);
00082 
00084   virtual void StartDocument();
00085   virtual void StartElement(HtmlElement* element);
00086   virtual void EndElement(HtmlElement* element);
00087 
00091   virtual void Characters(HtmlCharactersNode* characters);
00092 
00097   ResourcePtr CreateInputResource(const StringPiece& input_url);
00098 
00101   void ResolveUrl(StringPiece input_url, GoogleUrl* out_url);
00102 
00107   bool BaseUrlIsValid() const;
00108 
00113   bool DebugMode() const { return driver_->DebugMode(); }
00114 
00127   static bool ExtractMetaTagDetails(const HtmlElement& element,
00128                                     const ResponseHeaders* headers,
00129                                     GoogleString* content,
00130                                     GoogleString* mime_type,
00131                                     GoogleString* charset);
00132 
00137   bool CanAddPagespeedOnloadToImage(const HtmlElement&);
00138 
00143   virtual void LogFilterModifiedContent();
00144 
00148   virtual RewriteDriver::InlineAuthorizationPolicy AllowUnauthorizedDomain()
00149       const { return RewriteDriver::kInlineOnlyAuthorizedResources; }
00150 
00154   virtual bool IntendedForInlining() const { return false; }
00155 
00156  protected:
00157   ServerContext* server_context() const { return server_context_; }
00158   const RewriteOptions* rewrite_options() { return rewrite_options_; }
00159 
00163   virtual void StartDocumentImpl() = 0;
00164   virtual void StartElementImpl(HtmlElement* element) = 0;
00165   virtual void EndElementImpl(HtmlElement* element) = 0;
00166 
00169   virtual const char* LoggingId() { return Name(); }
00170 
00171  private:
00173   RewriteDriver* driver_;
00174   ServerContext* server_context_;
00175   const RewriteOptions* rewrite_options_;
00176   HtmlElement* noscript_element_;
00178   HtmlElement* end_body_point_;
00179   bool seen_base_;
00180 
00181   DISALLOW_COPY_AND_ASSIGN(CommonFilter);
00182 };
00183 
00184 }  
00185 
00186 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_COMMON_FILTER_H_
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