DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d38398e5144e)

VCS Links

CDMKeyInfo

CDMProxy

DecryptResult

DecryptStatus

MainThreadOnlyRawPtr

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef CDMProxy_h_
#define CDMProxy_h_

#include "mozilla/CDMCaps.h"
#include "mozilla/MozPromise.h"

#include "mozilla/dom/MediaKeyMessageEvent.h"
#include "mozilla/dom/MediaKeys.h"

#include "nsIThread.h"

namespace mozilla {
class MediaRawData;

enum DecryptStatus {
  Ok = 0,
  GenericErr = 1,
  NoKeyErr = 2,
  AbortedErr = 3,
};

struct DecryptResult {
  DecryptResult(DecryptStatus aStatus, MediaRawData* aSample)
    : mStatus(aStatus)
    , mSample(aSample)
  {}
  DecryptStatus mStatus;
  RefPtr<MediaRawData> mSample;
};

typedef MozPromise<DecryptResult, DecryptResult, /* IsExclusive = */ true> DecryptPromise;

class CDMKeyInfo {
public:
  explicit CDMKeyInfo(const nsTArray<uint8_t>& aKeyId)
    : mKeyId(aKeyId)
    , mStatus()
  {}

  CDMKeyInfo(const nsTArray<uint8_t>& aKeyId,
             const dom::Optional<dom::MediaKeyStatus>& aStatus)
    : mKeyId(aKeyId)
    , mStatus(aStatus.Value())
  {}

  // The copy-ctor and copy-assignment operator for Optional<T> are declared as
  // delete, so override CDMKeyInfo copy-ctor for nsTArray operations.
  CDMKeyInfo(const CDMKeyInfo& aKeyInfo)
  {
    mKeyId = aKeyInfo.mKeyId;
    if (aKeyInfo.mStatus.WasPassed()) {
      mStatus.Construct(aKeyInfo.mStatus.Value());
    }
  }

  nsTArray<uint8_t> mKeyId;
  dom::Optional<dom::MediaKeyStatus> mStatus;
};

typedef int64_t UnixTime;

// Proxies calls CDM, and proxies calls back.
// Note: Promises are passed in via a PromiseId, so that the ID can be
// passed via IPC to the CDM, which can then signal when to reject or
// resolve the promise using its PromiseId.
class CDMProxy {
protected:
  typedef dom::PromiseId PromiseId;
  typedef dom::MediaKeySessionType MediaKeySessionType;
public:

  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING

  // Main thread only.
  CDMProxy(dom::MediaKeys* aKeys,
           const nsAString& aKeySystem,
           bool aDistinctiveIdentifierRequired,
           bool aPersistentStateRequired)
    : mKeys(aKeys)
    , mKeySystem(aKeySystem)
    , mDistinctiveIdentifierRequired(aDistinctiveIdentifierRequired)
    , mPersistentStateRequired(aPersistentStateRequired)
  {}

  // Main thread only.
  // Loads the CDM corresponding to mKeySystem.
  // Calls MediaKeys::OnCDMCreated() when the CDM is created.
  virtual void Init(PromiseId aPromiseId,
                    const nsAString& aOrigin,
                    const nsAString& aTopLevelOrigin,
                    const nsAString& aName) = 0;

  virtual void OnSetDecryptorId(uint32_t aId) {}

  // Main thread only.
  // Uses the CDM to create a key session.
  // Calls MediaKeys::OnSessionActivated() when session is created.
  // Assumes ownership of (Move()s) aInitData's contents.
  virtual void CreateSession(uint32_t aCreateSessionToken,
                             MediaKeySessionType aSessionType,
                             PromiseId aPromiseId,
                             const nsAString& aInitDataType,
                             nsTArray<uint8_t>& aInitData) = 0;

  // Main thread only.
  // Uses the CDM to load a presistent session stored on disk.
  // Calls MediaKeys::OnSessionActivated() when session is loaded.
  virtual void LoadSession(PromiseId aPromiseId,
                           const nsAString& aSessionId) = 0;

  // Main thread only.
  // Sends a new certificate to the CDM.
  // Calls MediaKeys->ResolvePromise(aPromiseId) after the CDM has
  // processed the request.
  // Assumes ownership of (Move()s) aCert's contents.
  virtual void SetServerCertificate(PromiseId aPromiseId,
                                    nsTArray<uint8_t>& aCert) = 0;

  // Main thread only.
  // Sends an update to the CDM.
  // Calls MediaKeys->ResolvePromise(aPromiseId) after the CDM has
  // processed the request.
  // Assumes ownership of (Move()s) aResponse's contents.
  virtual void UpdateSession(const nsAString& aSessionId,
                             PromiseId aPromiseId,
                             nsTArray<uint8_t>& aResponse) = 0;

  // Main thread only.
  // Calls MediaKeys->ResolvePromise(aPromiseId) after the CDM has
  // processed the request.
  // If processing this operation results in the session actually closing,
  // we also call MediaKeySession::OnClosed(), which in turn calls
  // MediaKeys::OnSessionClosed().
  virtual void CloseSession(const nsAString& aSessionId,
                            PromiseId aPromiseId) = 0;

  // Main thread only.
  // Removes all data for a persisent session.
  // Calls MediaKeys->ResolvePromise(aPromiseId) after the CDM has
  // processed the request.
  virtual void RemoveSession(const nsAString& aSessionId,
                             PromiseId aPromiseId) = 0;

  // Main thread only.
  virtual void Shutdown() = 0;

  // Main thread only.
  virtual void Terminated() = 0;

  // Threadsafe.
  virtual const nsCString& GetNodeId() const = 0;

  // Main thread only.
  virtual void OnSetSessionId(uint32_t aCreateSessionToken,
                              const nsAString& aSessionId) = 0;

  // Main thread only.
  virtual void OnResolveLoadSessionPromise(uint32_t aPromiseId,
                                           bool aSuccess) = 0;

  // Main thread only.
  virtual void OnSessionMessage(const nsAString& aSessionId,
                                dom::MediaKeyMessageType aMessageType,
                                nsTArray<uint8_t>& aMessage) = 0;

  // Main thread only.
  virtual void OnExpirationChange(const nsAString& aSessionId,
                                  UnixTime aExpiryTime) = 0;

  // Main thread only.
  virtual void OnSessionClosed(const nsAString& aSessionId) = 0;

  // Main thread only.
  virtual void OnSessionError(const nsAString& aSessionId,
                              nsresult aException,
                              uint32_t aSystemCode,
                              const nsAString& aMsg) = 0;

  // Main thread only.
  virtual void OnRejectPromise(uint32_t aPromiseId,
                               nsresult aDOMException,
                               const nsCString& aMsg) = 0;

  virtual RefPtr<DecryptPromise> Decrypt(MediaRawData* aSample) = 0;

  // Owner thread only.
  virtual void OnDecrypted(uint32_t aId,
                           DecryptStatus aResult,
                           const nsTArray<uint8_t>& aDecryptedData) = 0;

  // Reject promise with DOMException corresponding to aExceptionCode.
  // Can be called from any thread.
  virtual void RejectPromise(PromiseId aId,
                             nsresult aExceptionCode,
                             const nsCString& aReason) = 0;

  // Resolves promise with "undefined".
  // Can be called from any thread.
  virtual void ResolvePromise(PromiseId aId) = 0;

  // Threadsafe.
  virtual const nsString& KeySystem() const = 0;

  virtual  CDMCaps& Capabilites() = 0;

  // Main thread only.
  virtual void OnKeyStatusesChange(const nsAString& aSessionId) = 0;

  virtual void GetSessionIdsForKeyId(const nsTArray<uint8_t>& aKeyId,
                                     nsTArray<nsCString>& aSessionIds) = 0;

#ifdef DEBUG
  virtual bool IsOnOwnerThread() = 0;
#endif

  virtual uint32_t GetDecryptorId() { return 0; }

protected:
  virtual ~CDMProxy() {}

  // Helper to enforce that a raw pointer is only accessed on the main thread.
  template<class Type>
  class MainThreadOnlyRawPtr {
  public:
    explicit MainThreadOnlyRawPtr(Type* aPtr)
      : mPtr(aPtr)
    {
      MOZ_ASSERT(NS_IsMainThread());
    }

    bool IsNull() const {
      MOZ_ASSERT(NS_IsMainThread());
      return !mPtr;
    }

    void Clear() {
      MOZ_ASSERT(NS_IsMainThread());
      mPtr = nullptr;
    }

    Type* operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN {
      MOZ_ASSERT(NS_IsMainThread());
      return mPtr;
    }
  private:
    Type* mPtr;
  };

  // Our reference back to the MediaKeys object.
  // WARNING: This is a non-owning reference that is cleared by MediaKeys
  // destructor. only use on main thread, and always nullcheck before using!
  MainThreadOnlyRawPtr<dom::MediaKeys> mKeys;

  const nsString mKeySystem;

  // Onwer specified thread. e.g. Gecko Media Plugin thread.
  // All interactions with the out-of-process EME plugin must come from this thread.
  RefPtr<nsIThread> mOwnerThread;

  nsCString mNodeId;

  CDMCaps mCapabilites;

  const bool mDistinctiveIdentifierRequired;
  const bool mPersistentStateRequired;
};


} // namespace mozilla

#endif // CDMProxy_h_