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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/android/meta_tag_observer.h"
      6 
      7 #include "chrome/common/chrome_constants.h"
      8 #include "chrome/common/render_messages.h"
      9 #include "content/public/browser/render_view_host.h"
     10 #include "content/public/browser/web_contents.h"
     11 #include "content/public/browser/web_contents_observer.h"
     12 
     13 MetaTagObserver::MetaTagObserver(const std::string& meta_tag)
     14     : meta_tag_(meta_tag) {
     15   if (meta_tag_.size() > chrome::kMaxMetaTagAttributeLength) {
     16     VLOG(1) << "Length of the <meta> name attribute is too large.";
     17     NOTREACHED();
     18   }
     19 }
     20 
     21 MetaTagObserver::~MetaTagObserver() {
     22 }
     23 
     24 void MetaTagObserver::DidFinishLoad(
     25     int64 frame_id,
     26     const GURL& validated_url,
     27     bool is_main_frame,
     28     content::RenderViewHost* render_view_host) {
     29   if (!is_main_frame) return;
     30   validated_url_ = validated_url;
     31   Send(new ChromeViewMsg_RetrieveMetaTagContent(routing_id(),
     32                                                 validated_url,
     33                                                 meta_tag_));
     34 }
     35 
     36 bool MetaTagObserver::OnMessageReceived(const IPC::Message& message) {
     37   bool handled = true;
     38   IPC_BEGIN_MESSAGE_MAP(MetaTagObserver, message)
     39     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_DidRetrieveMetaTagContent,
     40                         OnDidRetrieveMetaTagContent)
     41     IPC_MESSAGE_UNHANDLED(handled = false)
     42   IPC_END_MESSAGE_MAP()
     43   return handled;
     44 }
     45 
     46 void MetaTagObserver::OnDidRetrieveMetaTagContent(
     47     bool success,
     48     const std::string& tag_name,
     49     const std::string& tag_content,
     50     const GURL& expected_url) {
     51   if (!success || tag_name != meta_tag_ || validated_url_ != expected_url ||
     52       tag_content.size() >= chrome::kMaxMetaTagAttributeLength) {
     53     return;
     54   }
     55   HandleMetaTagContent(tag_content, expected_url);
     56 }
     57