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// 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 "content/renderer/media/webcontentdecryptionmodule_impl.h"
#include <map>
#include <vector>
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string_util.h"
#include "content/renderer/media/crypto/content_decryption_module_factory.h"
#include "content/renderer/media/webcontentdecryptionmodulesession_impl.h"
#include "media/base/media_keys.h"
namespace content {
// Forwards the session ID-based callbacks of the MediaKeys interface to the
// appropriate session object.
class SessionIdAdapter {
public:
SessionIdAdapter();
~SessionIdAdapter();
// On success, creates a MediaKeys, returns it in |media_keys|, returns true.
bool Initialize(const std::string& key_system,
scoped_ptr<media::MediaKeys>* media_keys);
// Adds a session to the internal map. Does not take ownership of the session.
void AddSession(const std::string& session_id,
WebContentDecryptionModuleSessionImpl* session);
// Removes a session from the internal map.
void RemoveSession(const std::string& session_id);
private:
typedef std::map<std::string, WebContentDecryptionModuleSessionImpl*>
SessionMap;
// Callbacks for firing key events.
void KeyAdded(const std::string& session_id);
void KeyError(const std::string& session_id,
media::MediaKeys::KeyError error_code,
int system_code);
void KeyMessage(const std::string& session_id,
const std::vector<uint8>& message,
const std::string& destination_url);
// Helper function of the callbacks.
WebContentDecryptionModuleSessionImpl* GetSession(
const std::string& session_id);
base::WeakPtrFactory<SessionIdAdapter> weak_ptr_factory_;
SessionMap sessions_;
DISALLOW_COPY_AND_ASSIGN(SessionIdAdapter);
};
SessionIdAdapter::SessionIdAdapter()
: weak_ptr_factory_(this) {
}
SessionIdAdapter::~SessionIdAdapter() {
}
bool SessionIdAdapter::Initialize(const std::string& key_system,
scoped_ptr<media::MediaKeys>* media_keys) {
DCHECK(media_keys);
DCHECK(!*media_keys);
base::WeakPtr<SessionIdAdapter> weak_this = weak_ptr_factory_.GetWeakPtr();
scoped_ptr<media::MediaKeys> created_media_keys =
ContentDecryptionModuleFactory::Create(
// TODO(ddorwin): Address lower in the stack: http://crbug.com/252065
"webkit-" + key_system,
#if defined(ENABLE_PEPPER_CDMS)
// TODO(ddorwin): Support Pepper-based CDMs: http://crbug.com/250049
NULL,
NULL,
base::Closure(),
#elif defined(OS_ANDROID)
// TODO(xhwang): Support Android.
NULL,
0,
#endif // defined(ENABLE_PEPPER_CDMS)
base::Bind(&SessionIdAdapter::KeyAdded, weak_this),
base::Bind(&SessionIdAdapter::KeyError, weak_this),
base::Bind(&SessionIdAdapter::KeyMessage, weak_this));
if (!created_media_keys)
return false;
*media_keys = created_media_keys.Pass();
return true;
}
void SessionIdAdapter::AddSession(
const std::string& session_id,
WebContentDecryptionModuleSessionImpl* session) {
DCHECK(sessions_.find(session_id) == sessions_.end());
sessions_[session_id] = session;
}
void SessionIdAdapter::RemoveSession(const std::string& session_id) {
DCHECK(sessions_.find(session_id) != sessions_.end());
sessions_.erase(session_id);
}
void SessionIdAdapter::KeyAdded(const std::string& session_id) {
GetSession(session_id)->KeyAdded();
}
void SessionIdAdapter::KeyError(const std::string& session_id,
media::MediaKeys::KeyError error_code,
int system_code) {
GetSession(session_id)->KeyError(error_code, system_code);
}
void SessionIdAdapter::KeyMessage(const std::string& session_id,
const std::vector<uint8>& message,
const std::string& destination_url) {
GetSession(session_id)->KeyMessage(message, destination_url);
}
WebContentDecryptionModuleSessionImpl* SessionIdAdapter::GetSession(
const std::string& session_id) {
// TODO(ddorwin): Map session IDs correctly. For now, we only support one.
std::string session_object_id = "";
WebContentDecryptionModuleSessionImpl* session = sessions_[session_object_id];
DCHECK(session); // It must have been present.
return session;
}
//------------------------------------------------------------------------------
WebContentDecryptionModuleImpl*
WebContentDecryptionModuleImpl::Create(const string16& key_system) {
// TODO(ddorwin): Guard against this in supported types check and remove this.
// Chromium only supports ASCII key systems.
if (!IsStringASCII(key_system)) {
NOTREACHED();
return NULL;
}
// SessionIdAdapter creates the MediaKeys so it can provide its callbacks to
// during creation of the MediaKeys.
scoped_ptr<media::MediaKeys> media_keys;
scoped_ptr<SessionIdAdapter> adapter(new SessionIdAdapter());
if (!adapter->Initialize(UTF16ToASCII(key_system), &media_keys))
return NULL;
return new WebContentDecryptionModuleImpl(media_keys.Pass(), adapter.Pass());
}
WebContentDecryptionModuleImpl::WebContentDecryptionModuleImpl(
scoped_ptr<media::MediaKeys> media_keys,
scoped_ptr<SessionIdAdapter> adapter)
: media_keys_(media_keys.Pass()),
adapter_(adapter.Pass()) {
}
WebContentDecryptionModuleImpl::~WebContentDecryptionModuleImpl() {
}
// The caller owns the created session.
WebKit::WebContentDecryptionModuleSession*
WebContentDecryptionModuleImpl::createSession(
WebKit::WebContentDecryptionModuleSession::Client* client) {
DCHECK(media_keys_);
WebContentDecryptionModuleSessionImpl* session =
new WebContentDecryptionModuleSessionImpl(
media_keys_.get(),
client,
base::Bind(&WebContentDecryptionModuleImpl::OnSessionClosed,
base::Unretained(this)));
// TODO(ddorwin): session_id is not populated yet!
adapter_->AddSession(session->session_id(), session);
return session;
}
void WebContentDecryptionModuleImpl::OnSessionClosed(
const std::string& session_id) {
adapter_->RemoveSession(session_id);
}
} // namespace content
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