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-rw-r--r--dom/media/imagecapture/ImageCapture.cpp212
1 files changed, 212 insertions, 0 deletions
diff --git a/dom/media/imagecapture/ImageCapture.cpp b/dom/media/imagecapture/ImageCapture.cpp
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+++ b/dom/media/imagecapture/ImageCapture.cpp
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+/* -*- 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/Event.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 "mozilla/dom/Document.h"
+#include "CaptureTask.h"
+#include "MediaEngineSource.h"
+
+namespace mozilla {
+
+LogModule* GetICLog() {
+ static LazyLogModule log("ImageCapture");
+ return log;
+}
+
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ImageCapture, DOMEventTargetHelper, mTrack)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageCapture)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_ADDREF_INHERITED(ImageCapture, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(ImageCapture, DOMEventTargetHelper)
+
+ImageCapture::ImageCapture(VideoStreamTrack* aTrack,
+ nsPIDOMWindowInner* aOwnerWindow)
+ : DOMEventTargetHelper(aOwnerWindow), mTrack(aTrack) {
+ MOZ_ASSERT(aOwnerWindow);
+ MOZ_ASSERT(aTrack);
+}
+
+ImageCapture::~ImageCapture() { MOZ_ASSERT(NS_IsMainThread()); }
+
+already_AddRefed<ImageCapture> ImageCapture::Constructor(
+ const GlobalObject& aGlobal, MediaStreamTrack& aTrack, ErrorResult& aRv) {
+ nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(aGlobal.GetAsSupports());
+ if (!win) {
+ aRv.Throw(NS_ERROR_FAILURE);
+ return nullptr;
+ }
+
+ if (!aTrack.AsVideoStreamTrack()) {
+ aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+ return nullptr;
+ }
+
+ RefPtr<ImageCapture> object =
+ new ImageCapture(aTrack.AsVideoStreamTrack(), win);
+
+ return object.forget();
+}
+
+MediaStreamTrack* ImageCapture::GetVideoStreamTrack() const { return mTrack; }
+
+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);
+ }
+
+ const RefPtr<VideoStreamTrack> mVideoTrack;
+ const RefPtr<ImageCapture> mImageCapture;
+ bool mPrincipalChanged;
+ };
+
+ RefPtr<MediaEnginePhotoCallback> callback =
+ new TakePhotoCallback(mTrack, this);
+ return mTrack->GetSource().TakePhoto(callback);
+}
+
+void ImageCapture::TakePhoto(ErrorResult& aResult) {
+ // According to spec, MediaStreamTrack.readyState must be "live"; however
+ // gecko doesn't implement it yet (bug 910249). Instead of readyState, we
+ // check MediaStreamTrack.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 (!mTrack->Enabled()) {
+ PostErrorEvent(ImageCaptureError::PHOTO_ERROR, NS_ERROR_FAILURE);
+ return;
+ }
+
+ // Try if MediaEngine supports taking photo.
+ nsresult rv = TakePhotoByMediaEngine();
+
+ // It falls back to MediaTrackGraph 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 "
+ "MediaTrackGraph.");
+ RefPtr<CaptureTask> task = new CaptureTask(this);
+
+ // It adds itself into MediaTrackGraph, 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, u"photo"_ns, init);
+
+ return DispatchTrustedEvent(blob_event);
+}
+
+nsresult ImageCapture::PostErrorEvent(uint16_t aErrorCode, nsresult aReason) {
+ MOZ_ASSERT(NS_IsMainThread());
+ nsresult rv = CheckCurrentGlobalCorrectness();
+ 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(
+ static_cast<EventTarget*>(this), aErrorCode, errorMsg);
+
+ ImageCaptureErrorEventInit init;
+ init.mBubbles = false;
+ init.mCancelable = false;
+ init.mImageCaptureError = error;
+
+ RefPtr<Event> event =
+ ImageCaptureErrorEvent::Constructor(this, u"error"_ns, init);
+
+ return DispatchTrustedEvent(event);
+}
+
+bool ImageCapture::CheckPrincipal() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ nsCOMPtr<nsIPrincipal> principal = mTrack->GetPrincipal();
+
+ if (!GetOwner()) {
+ return false;
+ }
+ nsCOMPtr<Document> 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