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Diffstat (limited to '')
-rw-r--r-- | dom/media/autoplay/GVAutoplayPermissionRequest.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/dom/media/autoplay/GVAutoplayPermissionRequest.h b/dom/media/autoplay/GVAutoplayPermissionRequest.h new file mode 100644 index 0000000000..f432e365c0 --- /dev/null +++ b/dom/media/autoplay/GVAutoplayPermissionRequest.h @@ -0,0 +1,86 @@ +/* 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 DOM_MEDIA_GVAUTOPLAYPERMISSIONREQUEST_H_ +#define DOM_MEDIA_GVAUTOPLAYPERMISSIONREQUEST_H_ + +#include "GVAutoplayRequestUtils.h" +#include "nsContentPermissionHelper.h" + +class nsGlobalWindowInner; + +namespace mozilla::dom { + +/** + * This class is used to provide an ability for GeckoView (GV) to allow its + * embedder (application) to decide whether the autoplay media should be allowed + * or denied on the page. We have two types of request, one for audible media, + * another one for inaudible media. Each page would at most have one request per + * type at a time, and the result of request would be effective on that page + * until the page gets reloaded or closed. + */ +class GVAutoplayPermissionRequest : public ContentPermissionRequestBase { + public: + NS_DECL_ISUPPORTS_INHERITED + NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(GVAutoplayPermissionRequest, + ContentPermissionRequestBase) + + // nsIContentPermissionRequest methods + NS_IMETHOD Cancel(void) override; + NS_IMETHOD Allow(JS::Handle<JS::Value> choices) override; + + private: + // Only allow to create this request from the requestor. + friend class GVAutoplayPermissionRequestor; + static void CreateRequest(nsGlobalWindowInner* aWindow, + BrowsingContext* aContext, + GVAutoplayRequestType aType); + + GVAutoplayPermissionRequest(nsGlobalWindowInner* aWindow, + BrowsingContext* aContext, + GVAutoplayRequestType aType); + ~GVAutoplayPermissionRequest(); + + void SetRequestStatus(GVAutoplayRequestStatus aStatus); + + GVAutoplayRequestType mType; + RefPtr<BrowsingContext> mContext; +}; + +/** + * This class provides a method to request autoplay permission for a page, which + * would be used to be a factor to determine if media is allowed to autoplay or + * not on GeckoView. + * + * A page could only have at most one audible request and one inaudible request, + * and once a page has been closed or reloaded, those requests would be dropped. + * In order to achieve that all media existing in the same page can share the + * result of those requests, the request status would only be stored in the + * top-level browsing context, which allows them to be synchronized among + * different processes when Fission is enabled. + * + * The current way we choose is to request for a permission when creating media + * element, in order to get the response from the embedding app before media + * starts playing if the app can response the request quickly enough. However, + * the request might be pending if the app doesn't response to it, we might + * never get the response. As that is just one factor of determining the + * autoplay result, even if we don't get the response for the request, we still + * have a chance to play media. Check AutoplayPolicy to see more details about + * how we decide the final autoplay decision. + */ +class GVAutoplayPermissionRequestor final { + public: + static void AskForPermissionIfNeeded(nsPIDOMWindowInner* aWindow); + + private: + static bool HasEverAskForRequest(BrowsingContext* aContext, + GVAutoplayRequestType aType); + static void CreateAsyncRequest(nsPIDOMWindowInner* aWindow, + BrowsingContext* aContext, + GVAutoplayRequestType aType); +}; + +} // namespace mozilla::dom + +#endif |