<webview>: First stab at implementing media permission request for guests.

content/browser/browser_plugin/browser_plugin_guest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 
 #include <algorithm>
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/browser_plugin/browser_plugin_embedder.h"
 #include "content/browser/browser_plugin/browser_plugin_guest_helper.h"
 #include "content/browser/browser_plugin/browser_plugin_host_factory.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/browser_plugin_messages.h"
 #include "content/common/content_constants_internal.h"
 #include "content/common/drag_messages.h"
 #include "content/common/view_messages.h"
 #include "content/port/browser/render_view_host_delegate_view.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/resource_request_details.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents_view.h"
+#include "content/public/common/media_stream_request.h"
 #include "content/public/common/result_codes.h"
 #include "content/browser/browser_plugin/browser_plugin_host_factory.h"
 #include "net/base/net_errors.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCursorInfo.h"
 #include "ui/surface/transport_dib.h"
 #include "webkit/glue/resource_type.h"
 #include "webkit/glue/webdropdata.h"
 
 #if defined(OS_MACOSX)
 #include "content/browser/browser_plugin/browser_plugin_popup_menu_helper_mac.h"
 #endif
 
 namespace content {
 
 // static
 BrowserPluginHostFactory* BrowserPluginGuest::factory_ = NULL;
 
+namespace {
+const size_t kNumMaxOutstandingMediaRequests = 1024;
+}
+
 BrowserPluginGuest::BrowserPluginGuest(
     int instance_id,
     WebContentsImpl* web_contents,
     const BrowserPluginHostMsg_CreateGuest_Params& params)
     : WebContentsObserver(web_contents),
       embedder_web_contents_(NULL),
       instance_id_(instance_id),
       damage_buffer_sequence_id_(0),
       damage_buffer_size_(0),
       damage_buffer_scale_factor_(1.0f),
       guest_hang_timeout_(
           base::TimeDelta::FromMilliseconds(kHungRendererDelayMs)),
       focused_(params.focused),
       visible_(params.visible),
       name_(params.name),
       auto_size_enabled_(params.auto_size_params.enable),
       max_auto_size_(params.auto_size_params.max_size),
-      min_auto_size_(params.auto_size_params.min_size) {
+      min_auto_size_(params.auto_size_params.min_size),
+      current_media_access_request_id_(0) {
   DCHECK(web_contents);
 }
 
 bool BrowserPluginGuest::OnMessageReceivedFromEmbedder(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(BrowserPluginGuest, message)
+    IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_AllowPermissionAccess,
+                        OnAllowPermissionAccess)

[Charlie Reis, 2013/02/11 22:20:56]

Why is "Access" in the name?  Maybe AllowPermission would be better?

[lazyboy, 2013/02/12 05:03:45]

Done.

     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_DragStatusUpdate,
                         OnDragStatusUpdate)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_Go, OnGo)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_HandleInputEvent,
                         OnHandleInputEvent)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_NavigateGuest, OnNavigateGuest)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_Reload, OnReload)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_ResizeGuest, OnResizeGuest)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_SetAutoSize, OnSetSize)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_SetFocus, OnSetFocus)
@@ skipping 584 matching lines @@
   if (!is_top_level)
     return;
 
   name_ = name;
   SendMessageToEmbedder(new BrowserPluginMsg_UpdatedName(
       embedder_routing_id(),
       instance_id_,
       name));
 }
 
+void BrowserPluginGuest::RequestMediaAccessPermission(
+    WebContents* web_contents,
+    const content::MediaStreamRequest& request,
+    const content::MediaResponseCallback& callback) {
+  if (media_requests_map_.size() >= kNumMaxOutstandingMediaRequests) {
+    // Deny the media request.
+    // TODO(lazyboy): We should use timeouts to clear this pending requests if

[Charlie Reis, 2013/02/11 22:20:56]

typo: this pending requests

[lazyboy, 2013/02/12 05:03:45]

Done.

+    // decision has not been made.
+    callback.Run(content::MediaStreamDevices());
+    return;
+  }
+  int request_id = current_media_access_request_id_++;
+  media_requests_map_.insert(
+      std::make_pair(request_id,
+                     std::make_pair(request, callback)));
+
+  SendMessageToEmbedder(new BrowserPluginMsg_RequestMediaAccess(
+      embedder_routing_id(), instance_id(), request_id,
+      request.security_origin));
+}
+
+void BrowserPluginGuest::OnAllowPermissionAccess(

[Charlie Reis, 2013/02/11 22:20:56]

Again, will this generalize to other types of permissions?

[lazyboy, 2013/02/12 05:03:45]

This one is generalized at this point and looks like we can reuse it for others.

+    int /*instance_id*/,
+    const std::string& permission_type,
+    int request_id,
+    bool should_allow) {
+  if (permission_type != "media")
+    return;
+
+  MediaStreamRequestsMap::iterator media_request_iter =
+      media_requests_map_.find(request_id);
+  if (media_request_iter == media_requests_map_.end()) {
+    LOG(INFO) << "Not a valid request ID.";
+    return;
+  }
+  const content::MediaStreamRequest& request = media_request_iter->second.first;
+  const content::MediaResponseCallback& callback =
+      media_request_iter->second.second;
+
+  if (should_allow && embedder_web_contents_) {
+    // Re-route the request to the embedder's WebContents; the guest gets the
+    // permission this way.
+    embedder_web_contents_->RequestMediaAccessPermission(request, callback);
+  } else {
+    // Deny the request.
+    callback.Run(content::MediaStreamDevices());
+  }
+  media_requests_map_.erase(media_request_iter);
+}
+
+
 void BrowserPluginGuest::OnUpdateRect(
     const ViewHostMsg_UpdateRect_Params& params) {
 
   BrowserPluginMsg_UpdateRect_Params relay_params;
   relay_params.view_size = params.view_size;
   relay_params.scale_factor = params.scale_factor;
   relay_params.is_resize_ack = ViewHostMsg_UpdateRect_Flags::is_resize_ack(
       params.flags);
   relay_params.needs_ack = params.needs_ack;
 
@@ skipping 41 matching lines @@
   relay_params.scroll_delta = params.scroll_delta;
   relay_params.scroll_rect = params.scroll_rect;
   relay_params.copy_rects = params.copy_rects;
 
   SendMessageToEmbedder(new BrowserPluginMsg_UpdateRect(embedder_routing_id(),
                                                         instance_id(),
                                                         relay_params));
 }
 
 }  // namespace content