| /* |
| * Copyright 2016 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_INSERT_AMP_LINK_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_INSERT_AMP_LINK_FILTER_H_ |
| |
| #include "net/instaweb/rewriter/public/common_filter.h" |
| #include "net/instaweb/rewriter/public/rewrite_driver.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/html/html_element.h" |
| #include "pagespeed/kernel/html/html_filter.h" |
| |
| namespace net_instaweb { |
| |
| // Inserts a <link rel=amphtml> link |
| class InsertAmpLinkFilter : public CommonFilter { |
| public: |
| explicit InsertAmpLinkFilter(RewriteDriver* driver); |
| ~InsertAmpLinkFilter() override; |
| |
| void StartDocumentImpl() override; |
| void StartElementImpl(HtmlElement* element) override; |
| void EndElementImpl(HtmlElement* element) override; |
| void DetermineEnabled(GoogleString* disabled_reason) override; |
| |
| const char* Name() const override { return "InsertAmpLink"; } |
| |
| // TODO(jmarantz): Make an explicit filter method declaring this filter as |
| // something we don't want to run in an AMP document. In the meantime, we |
| // can induce disabling for AMP documents with this: |
| ScriptUsage GetScriptUsage() const override { return kWillInjectScripts; } |
| |
| private: |
| // Returns the AMP URL to insert into the link tag. |
| GoogleString GetAmpUrl(); |
| // True if the filter is enabled |
| bool enabled_; |
| // True if an AMP link has already been found in the document. |
| bool amp_link_found_; |
| |
| DISALLOW_COPY_AND_ASSIGN(InsertAmpLinkFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_INSERT_AMP_LINK_FILTER_H_ |