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-rw-r--r--dom/media/imagecapture/CaptureTask.cpp197
-rw-r--r--dom/media/imagecapture/CaptureTask.h91
-rw-r--r--dom/media/imagecapture/ImageCapture.cpp232
-rw-r--r--dom/media/imagecapture/ImageCapture.h94
-rw-r--r--dom/media/imagecapture/moz.build16
5 files changed, 630 insertions, 0 deletions
diff --git a/dom/media/imagecapture/CaptureTask.cpp b/dom/media/imagecapture/CaptureTask.cpp
new file mode 100644
index 000000000..589ba5a42
--- /dev/null
+++ b/dom/media/imagecapture/CaptureTask.cpp
@@ -0,0 +1,197 @@
+/* -*- 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 "CaptureTask.h"
+#include "mozilla/dom/ImageCapture.h"
+#include "mozilla/dom/ImageCaptureError.h"
+#include "mozilla/dom/ImageEncoder.h"
+#include "mozilla/dom/MediaStreamTrack.h"
+#include "mozilla/dom/VideoStreamTrack.h"
+#include "gfxUtils.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+class CaptureTask::MediaStreamEventListener : public MediaStreamTrackListener
+{
+public:
+ explicit MediaStreamEventListener(CaptureTask* aCaptureTask)
+ : mCaptureTask(aCaptureTask) {};
+
+ // MediaStreamListener methods.
+ void NotifyEnded() override
+ {
+ if(!mCaptureTask->mImageGrabbedOrTrackEnd) {
+ mCaptureTask->PostTrackEndEvent();
+ }
+ }
+
+private:
+ CaptureTask* mCaptureTask;
+};
+
+CaptureTask::CaptureTask(dom::ImageCapture* aImageCapture)
+ : mImageCapture(aImageCapture)
+ , mEventListener(new MediaStreamEventListener(this))
+ , mImageGrabbedOrTrackEnd(false)
+ , mPrincipalChanged(false)
+{
+}
+
+nsresult
+CaptureTask::TaskComplete(already_AddRefed<dom::Blob> aBlob, nsresult aRv)
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ DetachTrack();
+
+ nsresult rv;
+ RefPtr<dom::Blob> blob(aBlob);
+
+ // We have to set the parent because the blob has been generated with a valid one.
+ if (blob) {
+ blob = dom::Blob::Create(mImageCapture->GetParentObject(), blob->Impl());
+ }
+
+ if (mPrincipalChanged) {
+ aRv = NS_ERROR_DOM_SECURITY_ERR;
+ IC_LOG("MediaStream principal should not change during TakePhoto().");
+ }
+
+ if (NS_SUCCEEDED(aRv)) {
+ rv = mImageCapture->PostBlobEvent(blob);
+ } else {
+ rv = mImageCapture->PostErrorEvent(dom::ImageCaptureError::PHOTO_ERROR, aRv);
+ }
+
+ // Ensure ImageCapture dereference on main thread here because the TakePhoto()
+ // sequences stopped here.
+ mImageCapture = nullptr;
+
+ return rv;
+}
+
+void
+CaptureTask::AttachTrack()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ dom::VideoStreamTrack* track = mImageCapture->GetVideoStreamTrack();
+ track->AddPrincipalChangeObserver(this);
+ track->AddListener(mEventListener.get());
+ track->AddDirectListener(this);
+}
+
+void
+CaptureTask::DetachTrack()
+{
+ MOZ_ASSERT(NS_IsMainThread());
+
+ dom::VideoStreamTrack* track = mImageCapture->GetVideoStreamTrack();
+ track->RemovePrincipalChangeObserver(this);
+ track->RemoveListener(mEventListener.get());
+ track->RemoveDirectListener(this);
+}
+
+void
+CaptureTask::PrincipalChanged(dom::MediaStreamTrack* aMediaStreamTrack)
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ mPrincipalChanged = true;
+}
+
+void
+CaptureTask::SetCurrentFrames(const VideoSegment& aSegment)
+{
+ if (mImageGrabbedOrTrackEnd) {
+ return;
+ }
+
+ // Callback for encoding complete, it calls on main thread.
+ class EncodeComplete : public dom::EncodeCompleteCallback
+ {
+ public:
+ explicit EncodeComplete(CaptureTask* aTask) : mTask(aTask) {}
+
+ nsresult ReceiveBlob(already_AddRefed<dom::Blob> aBlob) override
+ {
+ RefPtr<dom::Blob> blob(aBlob);
+ mTask->TaskComplete(blob.forget(), NS_OK);
+ mTask = nullptr;
+ return NS_OK;
+ }
+
+ protected:
+ RefPtr<CaptureTask> mTask;
+ };
+
+ VideoSegment::ConstChunkIterator iter(aSegment);
+
+
+
+ while (!iter.IsEnded()) {
+ VideoChunk chunk = *iter;
+
+ // Extract the first valid video frame.
+ VideoFrame frame;
+ if (!chunk.IsNull()) {
+ RefPtr<layers::Image> image;
+ if (chunk.mFrame.GetForceBlack()) {
+ // Create a black image.
+ image = VideoFrame::CreateBlackImage(chunk.mFrame.GetIntrinsicSize());
+ } else {
+ image = chunk.mFrame.GetImage();
+ }
+ MOZ_ASSERT(image);
+ mImageGrabbedOrTrackEnd = true;
+
+ // Encode image.
+ nsresult rv;
+ nsAutoString type(NS_LITERAL_STRING("image/jpeg"));
+ nsAutoString options;
+ rv = dom::ImageEncoder::ExtractDataFromLayersImageAsync(
+ type,
+ options,
+ false,
+ image,
+ new EncodeComplete(this));
+ if (NS_FAILED(rv)) {
+ PostTrackEndEvent();
+ }
+ return;
+ }
+ iter.Next();
+ }
+}
+
+void
+CaptureTask::PostTrackEndEvent()
+{
+ mImageGrabbedOrTrackEnd = true;
+
+ // Got track end or finish event, stop the task.
+ class TrackEndRunnable : public Runnable
+ {
+ public:
+ explicit TrackEndRunnable(CaptureTask* aTask)
+ : mTask(aTask) {}
+
+ NS_IMETHOD Run() override
+ {
+ mTask->TaskComplete(nullptr, NS_ERROR_FAILURE);
+ mTask = nullptr;
+ return NS_OK;
+ }
+
+ protected:
+ RefPtr<CaptureTask> mTask;
+ };
+
+ IC_LOG("Got MediaStream track removed or finished event.");
+ NS_DispatchToMainThread(new TrackEndRunnable(this));
+}
+
+} // namespace mozilla
diff --git a/dom/media/imagecapture/CaptureTask.h b/dom/media/imagecapture/CaptureTask.h
new file mode 100644
index 000000000..2b4f0a04c
--- /dev/null
+++ b/dom/media/imagecapture/CaptureTask.h
@@ -0,0 +1,91 @@
+/* -*- 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/. */
+
+#ifndef CAPTURETASK_H
+#define CAPTURETASK_H
+
+#include "MediaStreamGraph.h"
+#include "MediaStreamListener.h"
+#include "PrincipalChangeObserver.h"
+#include "MediaStreamVideoSink.h"
+
+namespace mozilla {
+
+namespace dom {
+class Blob;
+class ImageCapture;
+class MediaStreamTrack;
+} // namespace dom
+
+/**
+ * CaptureTask retrieves image from MediaStream and encodes the image to jpeg in
+ * ImageEncoder. The whole procedures start at AttachTrack(), it will add this
+ * class into MediaStream and retrieves an image in MediaStreamGraph thread.
+ * Once the image is retrieved, it will be sent to ImageEncoder and the encoded
+ * blob will be sent out via encoder callback in main thread.
+ *
+ * CaptureTask holds a reference of ImageCapture to ensure ImageCapture won't be
+ * released during the period of the capturing process described above.
+ */
+class CaptureTask : public MediaStreamVideoSink,
+ public dom::PrincipalChangeObserver<dom::MediaStreamTrack>
+{
+public:
+ class MediaStreamEventListener;
+
+ // MediaStreamVideoSink methods.
+ void SetCurrentFrames(const VideoSegment& aSegment) override;
+ void ClearFrames() override {}
+
+ // PrincipalChangeObserver<MediaStreamTrack> method.
+ void PrincipalChanged(dom::MediaStreamTrack* aMediaStreamTrack) override;
+
+ // CaptureTask methods.
+
+ // It is called when aBlob is ready to post back to script in company with
+ // aRv == NS_OK. If aRv is not NS_OK, it will post an error event to script.
+ //
+ // Note:
+ // this function should be called on main thread.
+ nsresult TaskComplete(already_AddRefed<dom::Blob> aBlob, nsresult aRv);
+
+ // Add listeners into MediaStreamTrack and PrincipalChangeObserver.
+ // It should be on main thread only.
+ void AttachTrack();
+
+ // Remove listeners from MediaStreamTrack and PrincipalChangeObserver.
+ // It should be on main thread only.
+ void DetachTrack();
+
+ // CaptureTask should be created on main thread.
+ explicit CaptureTask(dom::ImageCapture* aImageCapture);
+
+protected:
+ virtual ~CaptureTask() {}
+
+ // Post a runnable on main thread to end this task and call TaskComplete to post
+ // error event to script. It is called off-main-thread.
+ void PostTrackEndEvent();
+
+ // The ImageCapture associates with this task. This reference count should not
+ // change in this class unless it clears this reference after a blob or error
+ // event to script.
+ RefPtr<dom::ImageCapture> mImageCapture;
+
+ RefPtr<MediaStreamEventListener> mEventListener;
+
+ // True when an image is retrieved from MediaStreamGraph or MediaStreamGraph
+ // sends a track finish, end, or removed event.
+ bool mImageGrabbedOrTrackEnd;
+
+ // True after MediaStreamTrack principal changes while waiting for a photo
+ // to finish and we should raise a security error.
+ bool mPrincipalChanged;
+};
+
+} // namespace mozilla
+
+#endif // CAPTURETASK_H
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
diff --git a/dom/media/imagecapture/ImageCapture.h b/dom/media/imagecapture/ImageCapture.h
new file mode 100644
index 000000000..f3256f59b
--- /dev/null
+++ b/dom/media/imagecapture/ImageCapture.h
@@ -0,0 +1,94 @@
+/* -*- 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/. */
+
+#ifndef IMAGECAPTURE_H
+#define IMAGECAPTURE_H
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/dom/ImageCaptureBinding.h"
+#include "mozilla/Logging.h"
+
+namespace mozilla {
+
+#ifndef IC_LOG
+LogModule* GetICLog();
+#define IC_LOG(...) MOZ_LOG(GetICLog(), mozilla::LogLevel::Debug, (__VA_ARGS__))
+#endif
+
+namespace dom {
+
+class Blob;
+class VideoStreamTrack;
+
+/**
+ * Implementation of https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-
+ * capture/ImageCapture.html.
+ * The ImageCapture accepts a VideoStreamTrack as input source. The image will
+ * be sent back as a JPG format via Blob event.
+ *
+ * All the functions in ImageCapture are run in main thread.
+ *
+ * There are two ways to capture image, MediaEngineSource and MediaStreamGraph.
+ * When the implementation of MediaEngineSource supports TakePhoto(),
+ * it uses the platform camera to grab image. Otherwise, it falls back
+ * to the MediaStreamGraph way.
+ */
+
+class ImageCapture final : public DOMEventTargetHelper
+{
+public:
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ImageCapture, DOMEventTargetHelper)
+
+ IMPL_EVENT_HANDLER(photo)
+ IMPL_EVENT_HANDLER(error)
+
+ // WebIDL members.
+ void TakePhoto(ErrorResult& aResult);
+
+ // The MediaStream passed into the constructor.
+ VideoStreamTrack* GetVideoStreamTrack() const;
+
+ // nsWrapperCache member
+ JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override
+ {
+ return ImageCaptureBinding::Wrap(aCx, this, aGivenProto);
+ }
+
+ // ImageCapture class members
+ nsPIDOMWindowInner* GetParentObject() { return GetOwner(); }
+
+ static already_AddRefed<ImageCapture> Constructor(const GlobalObject& aGlobal,
+ VideoStreamTrack& aTrack,
+ ErrorResult& aRv);
+
+ ImageCapture(VideoStreamTrack* aVideoStreamTrack,
+ nsPIDOMWindowInner* aOwnerWindow);
+
+ // Post a Blob event to script.
+ nsresult PostBlobEvent(Blob* aBlob);
+
+ // Post an error event to script.
+ // aErrorCode should be one of error codes defined in ImageCaptureError.h.
+ // aReason is the nsresult which maps to a error string in dom/base/domerr.msg.
+ nsresult PostErrorEvent(uint16_t aErrorCode, nsresult aReason = NS_OK);
+
+ bool CheckPrincipal();
+
+protected:
+ virtual ~ImageCapture();
+
+ // Capture image by MediaEngine. If it's not support taking photo, this function
+ // should return NS_ERROR_NOT_IMPLEMENTED.
+ nsresult TakePhotoByMediaEngine();
+
+ RefPtr<VideoStreamTrack> mVideoStreamTrack;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // IMAGECAPTURE_H
diff --git a/dom/media/imagecapture/moz.build b/dom/media/imagecapture/moz.build
new file mode 100644
index 000000000..f47649c5e
--- /dev/null
+++ b/dom/media/imagecapture/moz.build
@@ -0,0 +1,16 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXPORTS.mozilla.dom += [
+ 'ImageCapture.h'
+]
+
+UNIFIED_SOURCES += [
+ 'CaptureTask.cpp',
+ 'ImageCapture.cpp',
+]
+
+FINAL_LIBRARY = 'xul'
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 17:41:11 +0000