| // Copyright 2013 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 "chrome/browser/media/webrtc/desktop_streams_registry.h" |
| |
| #include "base/base64.h" |
| #include "base/location.h" |
| #include "base/macros.h" |
| #include "base/time/time.h" |
| #include "content/public/browser/browser_thread.h" |
| #include "crypto/random.h" |
| |
| namespace { |
| |
| const int kStreamIdLengthBytes = 16; |
| |
| const int kApprovedStreamTimeToLiveSeconds = 10; |
| |
| std::string GenerateRandomStreamId() { |
| char buffer[kStreamIdLengthBytes]; |
| crypto::RandBytes(buffer, arraysize(buffer)); |
| std::string result; |
| base::Base64Encode(base::StringPiece(buffer, arraysize(buffer)), |
| &result); |
| return result; |
| } |
| |
| } // namespace |
| |
| DesktopStreamsRegistry::DesktopStreamsRegistry() {} |
| DesktopStreamsRegistry::~DesktopStreamsRegistry() {} |
| |
| std::string DesktopStreamsRegistry::RegisterStream( |
| int render_process_id, |
| int render_frame_id, |
| const GURL& origin, |
| const content::DesktopMediaID& source, |
| const std::string& extension_name) { |
| DCHECK_CURRENTLY_ON(content::BrowserThread::UI); |
| |
| std::string id = GenerateRandomStreamId(); |
| DCHECK(approved_streams_.find(id) == approved_streams_.end()); |
| ApprovedDesktopMediaStream& stream = approved_streams_[id]; |
| stream.render_process_id = render_process_id; |
| stream.render_frame_id = render_frame_id; |
| stream.origin = origin; |
| stream.source = source; |
| stream.extension_name = extension_name; |
| |
| content::BrowserThread::PostDelayedTask( |
| content::BrowserThread::UI, FROM_HERE, |
| base::BindOnce(&DesktopStreamsRegistry::CleanupStream, |
| base::Unretained(this), id), |
| base::TimeDelta::FromSeconds(kApprovedStreamTimeToLiveSeconds)); |
| |
| return id; |
| } |
| |
| content::DesktopMediaID DesktopStreamsRegistry::RequestMediaForStreamId( |
| const std::string& id, |
| int render_process_id, |
| int render_frame_id, |
| const GURL& origin, |
| std::string* extension_name) { |
| DCHECK_CURRENTLY_ON(content::BrowserThread::UI); |
| |
| StreamsMap::iterator it = approved_streams_.find(id); |
| |
| // Verify that if there is a request with the specified ID it was created for |
| // the same origin and the same renderer. |
| if (it == approved_streams_.end() || |
| render_process_id != it->second.render_process_id || |
| render_frame_id != it->second.render_frame_id || |
| origin != it->second.origin) { |
| return content::DesktopMediaID(); |
| } |
| |
| content::DesktopMediaID result = it->second.source; |
| *extension_name = it->second.extension_name; |
| approved_streams_.erase(it); |
| return result; |
| } |
| |
| void DesktopStreamsRegistry::CleanupStream(const std::string& id) { |
| DCHECK_CURRENTLY_ON(content::BrowserThread::UI); |
| approved_streams_.erase(id); |
| } |
| |
| DesktopStreamsRegistry::ApprovedDesktopMediaStream::ApprovedDesktopMediaStream() |
| : render_process_id(-1), render_frame_id(-1) {} |