src/chrome/browser/android/meta_tag_observer.cc

   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_frame_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(content::RenderFrameHost* render_frame_host,
  25                                     const GURL& validated_url) {
  26   if (render_frame_host->GetParent())
  27     return;
  28   validated_url_ = validated_url;
  29   Send(new ChromeViewMsg_RetrieveMetaTagContent(routing_id(),
  30                                                 validated_url,
  31                                                 meta_tag_));
  32 }
  33
  34 bool MetaTagObserver::OnMessageReceived(const IPC::Message& message) {
  35   bool handled = true;
  36   IPC_BEGIN_MESSAGE_MAP(MetaTagObserver, message)
  37     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_DidRetrieveMetaTagContent,
  38                         OnDidRetrieveMetaTagContent)
  39     IPC_MESSAGE_UNHANDLED(handled = false)
  40   IPC_END_MESSAGE_MAP()
  41   return handled;
  42 }
  43
  44 void MetaTagObserver::OnDidRetrieveMetaTagContent(
  45     bool success,
  46     const std::string& tag_name,
  47     const std::string& tag_content,
  48     const GURL& expected_url) {
  49   if (!success || tag_name != meta_tag_ || validated_url_ != expected_url ||
  50       tag_content.size() >= chrome::kMaxMetaTagAttributeLength) {
  51     return;
  52   }
  53   HandleMetaTagContent(tag_content, expected_url);
  54 }