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_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 }