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Diffstat (limited to 'dom/media/imagecapture/ImageCapture.cpp')
| -rw-r--r-- | dom/media/imagecapture/ImageCapture.cpp | 232 |
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 |