Separate BrowserCdmManager from BrowserMediaPlayerManager.

content/browser/media/android/browser_cdm_manager.cc

+// Copyright 2014 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/media/android/browser_cdm_manager.h"
+
+#include "base/command_line.h"
+#include "base/stl_util.h"
+#include "content/common/media/cdm_messages.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/content_client.h"
+#include "content/public/common/content_switches.h"
+#include "media/base/browser_cdm.h"
+#include "media/base/browser_cdm_factory.h"
+#include "media/base/media_switches.h"
+
+namespace content {
+
+using media::BrowserCdm;
+using media::MediaKeys;
+
+// Maximum lengths for various EME API parameters. These are checks to
+// prevent unnecessarily large parameters from being passed around, and the
+// lengths are somewhat arbitrary as the EME spec doesn't specify any limits.
+const size_t kMaxInitDataLength = 64 * 1024;  // 64 KB
+const size_t kMaxSessionResponseLength = 64 * 1024;  // 64 KB
+const size_t kMaxKeySystemLength = 256;
+
+// static
+BrowserCdmManager* BrowserCdmManager::Create(RenderFrameHost* rfh) {
+  return new BrowserCdmManager(rfh);
+}
+
+BrowserCdmManager::BrowserCdmManager(RenderFrameHost* render_frame_host)
+    : render_frame_host_(render_frame_host),
+      web_contents_(WebContents::FromRenderFrameHost(render_frame_host)),
+      weak_ptr_factory_(this) {
+}
+
+BrowserCdmManager::~BrowserCdmManager() {
+  STLDeleteValues(&cdm_map_);
+}
+
+BrowserCdm* BrowserCdmManager::GetCdm(int cdm_id) {
+  CdmMap::const_iterator iter = cdm_map_.find(cdm_id);
+  return (iter == cdm_map_.end()) ? NULL : iter->second;
+}
+
+void BrowserCdmManager::OnSessionCreated(
+    int cdm_id,
+    uint32 session_id,
+    const std::string& web_session_id) {
+  Send(new CdmMsg_SessionCreated(
+      RoutingID(), cdm_id, session_id, web_session_id));
+}
+
+void BrowserCdmManager::OnSessionMessage(
+    int cdm_id,
+    uint32 session_id,
+    const std::vector<uint8>& message,
+    const GURL& destination_url) {
+  GURL verified_gurl = destination_url;
+  if (!verified_gurl.is_valid() && !verified_gurl.is_empty()) {
+    DLOG(WARNING) << "SessionMessage destination_url is invalid : "
+                  << destination_url.possibly_invalid_spec();
+    verified_gurl = GURL::EmptyGURL();  // Replace invalid destination_url.
+  }
+
+  Send(new CdmMsg_SessionMessage(
+      RoutingID(), cdm_id, session_id, message, verified_gurl));
+}
+
+void BrowserCdmManager::OnSessionReady(int cdm_id, uint32 session_id) {
+  Send(new CdmMsg_SessionReady(RoutingID(), cdm_id, session_id));
+}
+
+void BrowserCdmManager::OnSessionClosed(int cdm_id, uint32 session_id) {
+  Send(new CdmMsg_SessionClosed(RoutingID(), cdm_id, session_id));
+}
+
+void BrowserCdmManager::OnSessionError(int cdm_id,
+                                       uint32 session_id,
+                                       MediaKeys::KeyError error_code,
+                                       uint32 system_code) {
+  Send(new CdmMsg_SessionError(
+      RoutingID(), cdm_id, session_id, error_code, system_code));
+}
+
+void BrowserCdmManager::OnInitializeCdm(int cdm_id,
+                                                const std::string& key_system,
+                                                const GURL& security_origin) {
+  if (key_system.size() > kMaxKeySystemLength) {
+    // This failure will be discovered and reported by OnCreateSession()
+    // as GetCdm() will return null.
+    NOTREACHED() << "Invalid key system: " << key_system;
+    return;
+  }
+
+  AddCdm(cdm_id, key_system, security_origin);
+}
+
+void BrowserCdmManager::OnCreateSession(
+    int cdm_id,
+    uint32 session_id,
+    CdmHostMsg_CreateSession_ContentType content_type,
+    const std::vector<uint8>& init_data) {
+  if (init_data.size() > kMaxInitDataLength) {
+    LOG(WARNING) << "InitData for ID: " << cdm_id
+                 << " too long: " << init_data.size();
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  // Convert the session content type into a MIME type. "audio" and "video"
+  // don't matter, so using "video" for the MIME type.
+  // Ref:
+  // https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#dom-createsession
+  std::string mime_type;
+  switch (content_type) {
+    case CREATE_SESSION_TYPE_WEBM:
+      mime_type = "video/webm";
+      break;
+    case CREATE_SESSION_TYPE_MP4:
+      mime_type = "video/mp4";
+      break;
+    default:
+      NOTREACHED();
+      return;
+  }
+
+#if defined(OS_ANDROID)
+  if (CommandLine::ForCurrentProcess()
+      ->HasSwitch(switches::kDisableInfobarForProtectedMediaIdentifier)) {
+    CreateSessionIfPermitted(cdm_id, session_id, mime_type, init_data, true);
+    return;
+  }
+#endif
+
+  BrowserCdm* cdm = GetCdm(cdm_id);
+  if (!cdm) {
+    DLOG(WARNING) << "No CDM for ID " << cdm_id << " found";
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  BrowserContext* context =
+      web_contents_->GetRenderProcessHost()->GetBrowserContext();
+
+  std::map<int, GURL>::const_iterator iter =
+      cdm_security_origin_map_.find(cdm_id);
+  if (iter == cdm_security_origin_map_.end()) {
+    NOTREACHED();
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  context->RequestProtectedMediaIdentifierPermission(
+      web_contents_->GetRenderProcessHost()->GetID(),
+      web_contents_->GetRenderViewHost()->GetRoutingID(),
+      iter->second,
+      base::Bind(&BrowserCdmManager::CreateSessionIfPermitted,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 cdm_id,
+                 session_id,
+                 mime_type,
+                 init_data));
+}
+
+void BrowserCdmManager::OnUpdateSession(
+    int cdm_id,
+    uint32 session_id,
+    const std::vector<uint8>& response) {
+  BrowserCdm* cdm = GetCdm(cdm_id);
+  if (!cdm) {
+    DLOG(WARNING) << "No CDM for ID " << cdm_id << " found";
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  if (response.size() > kMaxSessionResponseLength) {
+    LOG(WARNING) << "Response for ID " << cdm_id
+                 << " is too long: " << response.size();
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  cdm->UpdateSession(session_id, &response[0], response.size());
+}
+
+void BrowserCdmManager::OnReleaseSession(int cdm_id, uint32 session_id) {
+  BrowserCdm* cdm = GetCdm(cdm_id);
+  if (!cdm) {
+    DLOG(WARNING) << "No CDM for ID " << cdm_id << " found";
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  cdm->ReleaseSession(session_id);
+}
+
+void BrowserCdmManager::OnDestroyCdm(int cdm_id) {
+  BrowserCdm* cdm = GetCdm(cdm_id);
+  if (!cdm)
+    return;
+
+  CancelAllPendingSessionCreations(cdm_id);
+  RemoveCdm(cdm_id);
+}
+
+void BrowserCdmManager::CancelAllPendingSessionCreations(int cdm_id) {
+  BrowserContext* context =
+      web_contents_->GetRenderProcessHost()->GetBrowserContext();
+  std::map<int, GURL>::const_iterator iter =
+      cdm_security_origin_map_.find(cdm_id);
+  if (iter == cdm_security_origin_map_.end())
+    return;
+  context->CancelProtectedMediaIdentifierPermissionRequests(
+      web_contents_->GetRenderProcessHost()->GetID(),
+      web_contents_->GetRenderViewHost()->GetRoutingID(),
+      iter->second);
+}
+
+void BrowserCdmManager::AddCdm(int cdm_id,
+                                       const std::string& key_system,
+                                       const GURL& security_origin) {
+  DCHECK(!GetCdm(cdm_id));
+  base::WeakPtr<BrowserCdmManager> weak_this = weak_ptr_factory_.GetWeakPtr();
+  scoped_ptr<BrowserCdm> cdm(media::CreateBrowserCdm(
+      key_system,
+      base::Bind(&BrowserCdmManager::OnSessionCreated, weak_this, cdm_id),
+      base::Bind(&BrowserCdmManager::OnSessionMessage, weak_this, cdm_id),
+      base::Bind(&BrowserCdmManager::OnSessionReady, weak_this, cdm_id),
+      base::Bind(&BrowserCdmManager::OnSessionClosed, weak_this, cdm_id),
+      base::Bind(&BrowserCdmManager::OnSessionError, weak_this, cdm_id)));
+
+  if (!cdm) {
+    // This failure will be discovered and reported by OnCreateSession()
+    // as GetCdm() will return null.
+    DVLOG(1) << "failed to create CDM.";
+    return;
+  }
+
+  cdm_map_[cdm_id] = cdm.release();
+  cdm_security_origin_map_[cdm_id] = security_origin;
+}
+
+void BrowserCdmManager::RemoveCdm(int cdm_id) {
+  // TODO(xhwang): Detach CDM from the player it's set to. In prefixed
+  // EME implementation the current code is fine because we always destroy the
+  // player before we destroy the DrmBridge. This will not always be the case
+  // in unprefixed EME implementation.
+  CdmMap::iterator iter = cdm_map_.find(cdm_id);
+  if (iter != cdm_map_.end()) {
+    delete iter->second;
+    cdm_map_.erase(iter);
+  }
+  cdm_security_origin_map_.erase(cdm_id);
+}
+
+int BrowserCdmManager::RoutingID() {
+  return render_frame_host_->GetRoutingID();
+}
+
+bool BrowserCdmManager::Send(IPC::Message* msg) {
+  return render_frame_host_->Send(msg);
+}
+
+void BrowserCdmManager::CreateSessionIfPermitted(
+    int cdm_id,
+    uint32 session_id,
+    const std::string& content_type,
+    const std::vector<uint8>& init_data,
+    bool permitted) {
+  if (!permitted) {
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  BrowserCdm* cdm = GetCdm(cdm_id);
+  if (!cdm) {
+    DLOG(WARNING) << "No CDM for ID: " << cdm_id << " found";
+    OnSessionError(cdm_id, session_id, MediaKeys::kUnknownError, 0);
+    return;
+  }
+
+  // This could fail, in which case a SessionError will be fired.
+  cdm->CreateSession(session_id, content_type, &init_data[0], init_data.size());
+}
+
+}  // namespace content