content/media/plugins/MediaResourceServer.h@97036ab72558 (annotated)
content/media/plugins/MediaResourceServer.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim:set ts=2 sw=2 sts=2 et cindent: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this file, |
| michael@0 | 5 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | #if !defined(MediaResourceServer_h_) |
| michael@0 | 7 | #define MediaResourceServer_h_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include <map> |
| michael@0 | 10 | #include "nsIServerSocket.h" |
| michael@0 | 11 | #include "MediaResource.h" |
| michael@0 | 12 | |
| michael@0 | 13 | namespace mozilla { |
| michael@0 | 14 | |
| michael@0 | 15 | class MediaResource; |
| michael@0 | 16 | |
| michael@0 | 17 | /* |
| michael@0 | 18 | MediaResourceServer instantiates a socket server that understands |
| michael@0 | 19 | HTTP requests for MediaResource instances. The server runs on an |
| michael@0 | 20 | automatically selected port and MediaResource instances are registered. |
| michael@0 | 21 | The registration returns a string URL than can be used to fetch the |
| michael@0 | 22 | resource. That URL contains a randomly generated path to make it |
| michael@0 | 23 | difficult for other local applications on the device to guess it. |
| michael@0 | 24 | |
| michael@0 | 25 | The HTTP protocol is limited in that it supports only what the |
| michael@0 | 26 | Android DataSource implementation uses to fetch media. It |
| michael@0 | 27 | understands HTTP GET and byte range requests. |
| michael@0 | 28 | |
| michael@0 | 29 | The intent of this class is to be used in Media backends that |
| michael@0 | 30 | have a system component that does its own network requests. These |
| michael@0 | 31 | requests are made against this server which then uses standard |
| michael@0 | 32 | Gecko network requests and media cache usage. |
| michael@0 | 33 | |
| michael@0 | 34 | The MediaResourceServer can be instantiated on any thread and |
| michael@0 | 35 | its methods are threadsafe - they can be called on any thread. |
| michael@0 | 36 | The server socket itself is always run on the main thread and |
| michael@0 | 37 | this is done by the Start() static method by synchronously |
| michael@0 | 38 | dispatching to the main thread. |
| michael@0 | 39 | */ |
| michael@0 | 40 | class MediaResourceServer : public nsRunnable |
| michael@0 | 41 | { |
| michael@0 | 42 | private: |
| michael@0 | 43 | // Mutex protecting private members of MediaResourceServer. |
| michael@0 | 44 | // All member variables below this point in the class definition |
| michael@0 | 45 | // must acquire the mutex before access. |
| michael@0 | 46 | mozilla::Mutex mMutex; |
| michael@0 | 47 | |
| michael@0 | 48 | // Server socket used to listen for incoming connections |
| michael@0 | 49 | nsCOMPtr<nsIServerSocket> mSocket; |
| michael@0 | 50 | |
| michael@0 | 51 | // Mapping between MediaResource URL's to the MediaResource |
| michael@0 | 52 | // object served at that URL. |
| michael@0 | 53 | typedef std::map<nsCString, |
| michael@0 | 54 | nsRefPtr<mozilla::MediaResource> > ResourceMap; |
| michael@0 | 55 | ResourceMap mResources; |
| michael@0 | 56 | |
| michael@0 | 57 | // Create a MediaResourceServer that will listen on an automatically |
| michael@0 | 58 | // selected port when started. This is private as it should only be |
| michael@0 | 59 | // called internally from the public 'Start' method. |
| michael@0 | 60 | MediaResourceServer(); |
| michael@0 | 61 | NS_IMETHOD Run(); |
| michael@0 | 62 | |
| michael@0 | 63 | // Append a random URL path to a string. This is used for creating a |
| michael@0 | 64 | // unique URl for a resource which helps prevent malicious software |
| michael@0 | 65 | // running on the same machine as the server from guessing the URL |
| michael@0 | 66 | // and accessing video data. |
| michael@0 | 67 | nsresult AppendRandomPath(nsCString& aURL); |
| michael@0 | 68 | |
| michael@0 | 69 | public: |
| michael@0 | 70 | // Create a MediaResourceServer and start it listening. This call will |
| michael@0 | 71 | // perform a synchronous request on the main thread. |
| michael@0 | 72 | static already_AddRefed<MediaResourceServer> Start(); |
| michael@0 | 73 | |
| michael@0 | 74 | // Stops the server from listening and accepting further connections. |
| michael@0 | 75 | void Stop(); |
| michael@0 | 76 | |
| michael@0 | 77 | // Add a MediaResource to be served by this server. Stores the |
| michael@0 | 78 | // absolute URL that can be used to access the resource in 'aUrl'. |
| michael@0 | 79 | nsresult AddResource(mozilla::MediaResource* aResource, nsCString& aUrl); |
| michael@0 | 80 | |
| michael@0 | 81 | // Remove a MediaResource so it is no longer served by this server. |
| michael@0 | 82 | // The URL provided must match exactly that provided by a previous |
| michael@0 | 83 | // call to "AddResource". |
| michael@0 | 84 | void RemoveResource(nsCString const& aUrl); |
| michael@0 | 85 | |
| michael@0 | 86 | // Returns the prefix for HTTP requests to the server. This plus |
| michael@0 | 87 | // the result of AddResource results in an Absolute URL. |
| michael@0 | 88 | nsCString GetURLPrefix(); |
| michael@0 | 89 | |
| michael@0 | 90 | // Returns the resource asociated with a given URL |
| michael@0 | 91 | already_AddRefed<mozilla::MediaResource> GetResource(nsCString const& aUrl); |
| michael@0 | 92 | }; |
| michael@0 | 93 | |
| michael@0 | 94 | } // namespace mozilla |
| michael@0 | 95 | |
| michael@0 | 96 | #endif |
