| /* |
| * Copyright 2012 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: mmohabey@google.com (Megha Mohabey) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_SUPPRESS_PREHEAD_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_SUPPRESS_PREHEAD_FILTER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/scoped_ptr.h" |
| #include "pagespeed/kernel/base/split_writer.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_writer.h" |
| #include "pagespeed/kernel/html/html_writer_filter.h" |
| #include "pagespeed/kernel/http/response_headers.h" |
| |
| namespace net_instaweb { |
| |
| class HtmlElement; |
| class RewriteDriver; |
| class Writer; |
| |
| // SuppressPreheadFilter extracts the html before the <head> (pre head) and |
| // stores it in property cache to be used by FlushEarlyFlow. If a request is |
| // flushed early then the pre head value stored by this filter is used for |
| // responding to the request. When a response is received by the origin server, |
| // then this filter suppresses the pre head so that it is not written to the |
| // output again. |
| class SuppressPreheadFilter : public HtmlWriterFilter { |
| public: |
| explicit SuppressPreheadFilter(RewriteDriver* driver); |
| |
| virtual void StartDocument(); |
| |
| virtual void StartElement(HtmlElement* element); |
| |
| virtual void EndElement(HtmlElement* element); |
| |
| virtual void EndDocument(); |
| |
| protected: |
| virtual void Clear(); |
| RewriteDriver* driver() const { return driver_; } |
| |
| private: |
| friend class SuppressPreheadFilterTest; |
| void SendCookies(HtmlElement* element); |
| |
| void PreHeadDone(HtmlElement* element); |
| |
| static void UpdateFetchLatencyInFlushEarlyProto(int64 latency, |
| RewriteDriver*driver); |
| |
| // If X-UA-Compatible meta tag is set then convert that to response header. |
| bool ExtractAndUpdateXUACompatible(HtmlElement* element); |
| |
| bool seen_start_html_; |
| bool seen_first_head_; |
| bool has_charset_; |
| bool has_x_ua_compatible_; |
| |
| HtmlElement* noscript_element_; |
| RewriteDriver* driver_; |
| GoogleString pre_head_; // The html text till the <head> |
| GoogleString charset_; |
| // Writer for writing to the response buffer. |
| Writer* original_writer_; |
| StringWriter pre_head_writer_; // Writer to write the pre_head_. |
| // Writer to write both the pre_head string and to the response buffer. |
| scoped_ptr<SplitWriter> pre_head_and_response_writer_; |
| scoped_ptr<ResponseHeaders> response_headers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SuppressPreheadFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_SUPPRESS_PREHEAD_FILTER_H_ |
