Add m-esr52 at 52.6.0

1 files changed, 232 insertions, 0 deletions

diff --git a/dom/media/imagecapture/ImageCapture.cpp b/dom/media/imagecapture/ImageCapture.cpp
new file mode 100644
index 000000000..243fcbcc8
--- /dev/null
+++ b/dom/media/imagecapture/ImageCapture.cpp
@@ -0,0 +1,232 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#include "ImageCapture.h"
+#include "mozilla/dom/BlobEvent.h"
+#include "mozilla/dom/DOMException.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/ImageCaptureError.h"
+#include "mozilla/dom/ImageCaptureErrorEvent.h"
+#include "mozilla/dom/ImageCaptureErrorEventBinding.h"
+#include "mozilla/dom/VideoStreamTrack.h"
+#include "nsIDocument.h"
+#include "CaptureTask.h"
+#include "MediaEngine.h"
+
+namespace mozilla {
+
+LogModule* GetICLog()
+{
+  static LazyLogModule log("ImageCapture");
+  return log;
+}
+
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ImageCapture, DOMEventTargetHelper,
+                                   mVideoStreamTrack)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(ImageCapture)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_ADDREF_INHERITED(ImageCapture, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(ImageCapture, DOMEventTargetHelper)
+
+ImageCapture::ImageCapture(VideoStreamTrack* aVideoStreamTrack,
+                           nsPIDOMWindowInner* aOwnerWindow)
+  : DOMEventTargetHelper(aOwnerWindow)
+{
+  MOZ_ASSERT(aOwnerWindow);
+  MOZ_ASSERT(aVideoStreamTrack);
+
+  mVideoStreamTrack = aVideoStreamTrack;
+}
+
+ImageCapture::~ImageCapture()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+already_AddRefed<ImageCapture>
+ImageCapture::Constructor(const GlobalObject& aGlobal,
+                          VideoStreamTrack& aTrack,
+                          ErrorResult& aRv)
+{
+  nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(aGlobal.GetAsSupports());
+  if (!win) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  RefPtr<ImageCapture> object = new ImageCapture(&aTrack, win);
+
+  return object.forget();
+}
+
+VideoStreamTrack*
+ImageCapture::GetVideoStreamTrack() const
+{
+  return mVideoStreamTrack;
+}
+
+nsresult
+ImageCapture::TakePhotoByMediaEngine()
+{
+  // Callback for TakPhoto(), it also monitor the principal. If principal
+  // changes, it returns PHOTO_ERROR with security error.
+  class TakePhotoCallback : public MediaEnginePhotoCallback,
+                            public PrincipalChangeObserver<MediaStreamTrack>
+  {
+  public:
+    TakePhotoCallback(VideoStreamTrack* aVideoTrack, ImageCapture* aImageCapture)
+      : mVideoTrack(aVideoTrack)
+      , mImageCapture(aImageCapture)
+      , mPrincipalChanged(false)
+    {
+      MOZ_ASSERT(NS_IsMainThread());
+      mVideoTrack->AddPrincipalChangeObserver(this);
+    }
+
+    void PrincipalChanged(MediaStreamTrack* aMediaStream) override
+    {
+      mPrincipalChanged = true;
+    }
+
+    nsresult PhotoComplete(already_AddRefed<Blob> aBlob) override
+    {
+      RefPtr<Blob> blob = aBlob;
+
+      if (mPrincipalChanged) {
+        return PhotoError(NS_ERROR_DOM_SECURITY_ERR);
+      }
+      return mImageCapture->PostBlobEvent(blob);
+    }
+
+    nsresult PhotoError(nsresult aRv) override
+    {
+      return mImageCapture->PostErrorEvent(ImageCaptureError::PHOTO_ERROR, aRv);
+    }
+
+  protected:
+    ~TakePhotoCallback()
+    {
+      MOZ_ASSERT(NS_IsMainThread());
+      mVideoTrack->RemovePrincipalChangeObserver(this);
+    }
+
+    RefPtr<VideoStreamTrack> mVideoTrack;
+    RefPtr<ImageCapture> mImageCapture;
+    bool mPrincipalChanged;
+  };
+
+  RefPtr<MediaEnginePhotoCallback> callback =
+    new TakePhotoCallback(mVideoStreamTrack, this);
+  return mVideoStreamTrack->GetSource().TakePhoto(callback);
+}
+
+void
+ImageCapture::TakePhoto(ErrorResult& aResult)
+{
+  // According to spec, VideoStreamTrack.readyState must be "live"; however
+  // gecko doesn't implement it yet (bug 910249). Instead of readyState, we
+  // check VideoStreamTrack.enable before bug 910249 is fixed.
+  // The error code should be INVALID_TRACK, but spec doesn't define it in
+  // ImageCaptureError. So it returns PHOTO_ERROR here before spec updates.
+  if (!mVideoStreamTrack->Enabled()) {
+    PostErrorEvent(ImageCaptureError::PHOTO_ERROR, NS_ERROR_FAILURE);
+    return;
+  }
+
+  // Try if MediaEngine supports taking photo.
+  nsresult rv = TakePhotoByMediaEngine();
+
+  // It falls back to MediaStreamGraph image capture if MediaEngine doesn't
+  // support TakePhoto().
+  if (rv == NS_ERROR_NOT_IMPLEMENTED) {
+    IC_LOG("MediaEngine doesn't support TakePhoto(), it falls back to MediaStreamGraph.");
+    RefPtr<CaptureTask> task = new CaptureTask(this);
+
+    // It adds itself into MediaStreamGraph, so ImageCapture doesn't need to hold
+    // the reference.
+    task->AttachTrack();
+  }
+}
+
+nsresult
+ImageCapture::PostBlobEvent(Blob* aBlob)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!CheckPrincipal()) {
+    // Media is not same-origin, don't allow the data out.
+    return PostErrorEvent(ImageCaptureError::PHOTO_ERROR, NS_ERROR_DOM_SECURITY_ERR);
+  }
+
+  BlobEventInit init;
+  init.mBubbles = false;
+  init.mCancelable = false;
+  init.mData = aBlob;
+
+  RefPtr<BlobEvent> blob_event =
+    BlobEvent::Constructor(this, NS_LITERAL_STRING("photo"), init);
+
+  return DispatchTrustedEvent(blob_event);
+}
+
+nsresult
+ImageCapture::PostErrorEvent(uint16_t aErrorCode, nsresult aReason)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  nsresult rv = CheckInnerWindowCorrectness();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsString errorMsg;
+  if (NS_FAILED(aReason)) {
+    nsCString name, message;
+    rv = NS_GetNameAndMessageForDOMNSResult(aReason, name, message);
+    if (NS_SUCCEEDED(rv)) {
+      CopyASCIItoUTF16(message, errorMsg);
+    }
+  }
+
+  RefPtr<ImageCaptureError> error =
+    new ImageCaptureError(this, aErrorCode, errorMsg);
+
+  ImageCaptureErrorEventInit init;
+  init.mBubbles = false;
+  init.mCancelable = false;
+  init.mImageCaptureError = error;
+
+  nsCOMPtr<nsIDOMEvent> event =
+    ImageCaptureErrorEvent::Constructor(this, NS_LITERAL_STRING("error"), init);
+
+  return DispatchTrustedEvent(event);
+}
+
+bool
+ImageCapture::CheckPrincipal()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIPrincipal> principal = mVideoStreamTrack->GetPrincipal();
+
+  if (!GetOwner()) {
+    return false;
+  }
+  nsCOMPtr<nsIDocument> doc = GetOwner()->GetExtantDoc();
+  if (!doc || !principal) {
+    return false;
+  }
+
+  bool subsumes;
+  if (NS_FAILED(doc->NodePrincipal()->Subsumes(principal, &subsumes))) {
+    return false;
+  }
+
+  return subsumes;
+}
+
+} // namespace dom
+} // namespace mozilla