Differential D24870 Diff 69762 extension/content-script.js

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extension/content-script.js

Show First 20 Lines • Show All 775 Lines • ▼ Show 20 Line(s)		637	if (document.documentElement.tagName.toLowerCase() === "html") {
776		776
777	// here we replace the document.createElement function with our own so we can detect	777		// here we replace the document.createElement function with our own so we can detect
778	// when an <audio> tag is created that is not added to the DOM which most pages do	778		// when an <audio> tag is created that is not added to the DOM which most pages do
779	// while a <video> tag typically ends up being displayed to the user, audio is not.	779		// while a <video> tag typically ends up being displayed to the user, audio is not.
780	// HACK We cannot really pass variables from the page's scope to our content-script's scope	780		// HACK We cannot really pass variables from the page's scope to our content-script's scope
781	// so we just blatantly insert the <audio> tag in the DOM and pick it up through our regular	781		// so we just blatantly insert the <audio> tag in the DOM and pick it up through our regular
782	// mechanism. Let's see how this goes :D	782		// mechanism. Let's see how this goes :D
783		783
		784		// HACK When removing a media object from DOM it is paused, so what we do here is once the
		785		// player loaded some data we add it (doesn't work earlier since it cannot pause when
		786		// there's nothing loaded to pause) to the DOM and before we remove it, we note down that
		787		// we will now get a paused event because of that. When we get it, we just play() the player
		788		// so it continues playing :-)
		789		const addPlayerToDomEvadingAutoPlayBlocking = `
		790		player.registerInDom = () => {
		791		player.pausedBecauseOfDomRemoval = true;
		792		player.removeEventListener("play", player.registerInDom);
		793
		794		(document.head \|\| document.documentElement).appendChild(player);
		795		player.parentNode.removeChild(player);
		796		};
		797
		798		player.replayAfterRemoval = () => {
		799		if (player.pausedBecauseOfDomRemoval === true) {
		800		delete player.pausedBecauseOfDomRemoval;
		801		player.removeEventListener("pause", player.replyAfterRemoval);
		802
		803		player.play();
		804		}
		805		};
		806
		807		player.addEventListener("play", player.registerInDom);
		808		player.addEventListener("pause", player.replayAfterRemoval);
		809		`;
		810
784	executeScript(`function() {	811		executeScript(`function() {
785	var oldCreateElement = Document.prototype.createElement;	812		var oldCreateElement = Document.prototype.createElement;
786	Document.prototype.createElement = function() {	813		Document.prototype.createElement = function() {
787	var createdTag = oldCreateElement.apply(this, arguments);	814		var createdTag = oldCreateElement.apply(this, arguments);
788		815
789	var tagName = arguments[0];	816		var tagName = arguments[0];
790		817
791	if (typeof tagName === "string") {	818		if (typeof tagName === "string") {
792	if (tagName.toLowerCase() === "audio" \|\| tagName.toLowerCase() === "video") {	819		if (tagName.toLowerCase() === "audio") {
		820		const player = createdTag;
		821		${addPlayerToDomEvadingAutoPlayBlocking}
		822		} else if (tagName.toLowerCase() === "video") {
793	(document.head \|\| document.documentElement).appendChild(createdTag);	823		(document.head \|\| document.documentElement).appendChild(createdTag);
794	createdTag.parentNode.removeChild(createdTag);	824		createdTag.parentNode.removeChild(createdTag);
795	}	825		}
796	}	826		}
797		827
798	return createdTag;	828		return createdTag;
799	};	829		};
800	}	830		}
801	`);	831		`);
802		832
803	// We also briefly add items created as new Audio() to the DOM so we can control it	833		// We also briefly add items created as new Audio() to the DOM so we can control it
804	// similar to the document.createElement hack above since we cannot share variables	834		// similar to the document.createElement hack above since we cannot share variables
805	// between the actual website and the background script despite them sharing the same DOM	835		// between the actual website and the background script despite them sharing the same DOM
806	// HACK When removing a media object from DOM it is paused, so what we do here is once the	836
807	// player loaded some data we add it (doesn't work earlier since it cannot pause when
808	// there's nothing loaded to pause) to the DOM and before we remove it, we note down that
809	// we will now get a paused event because of that. When we get it, we just play() the player
810	// so it continues playing :-)
811	if (IS_FIREFOX) {	837		if (IS_FIREFOX) {
812	// Firefox enforces Content-Security-Policy also for scripts injected by the content-script	838		// Firefox enforces Content-Security-Policy also for scripts injected by the content-script
813	// This causes our executeScript calls to fail for pages like Nextcloud	839		// This causes our executeScript calls to fail for pages like Nextcloud
814	// It also doesn't seem to have the aggressive autoplay prevention Chrome has,	840		// It also doesn't seem to have the aggressive autoplay prevention Chrome has,
815	// so the horrible replyAfterRemoval hack from above isn't copied into this	841		// so the horrible replyAfterRemoval hack from above isn't copied into this
816	// See Bug 411148: Music playing from the ownCloud Music app does not show up	842		// See Bug 411148: Music playing from the ownCloud Music app does not show up
817	var oldAudio = window.Audio;	843		var oldAudio = window.Audio;
818	exportFunction(function() {	844		exportFunction(function(...args) {
819	var createdAudio = new (Function.prototype.bind.apply(oldAudio, arguments));	845		const player = new oldAudio(...args);
820		846		eval(addPlayerToDomEvadingAutoPlayBlocking);
821	(document.head \|\| document.documentElement).appendChild(createdAudio);	847		return player;
822	createdAudio.parentNode.removeChild(createdAudio);
823
824	return createdAudio;
825	}, window, {defineAs: "Audio"});	848		}, window, {defineAs: "Audio"});
826	} else {	849		} else {
827	executeScript(`function() {	850		executeScript(`function() {
828	var oldAudio = window.Audio;	851		var oldAudio = window.Audio;
829	window.Audio = function () {	852		window.Audio = function (...args) {
830	var createdAudio = new (Function.prototype.bind.apply(oldAudio, arguments));	853		const player = new oldAudio(...args);
831		854		${addPlayerToDomEvadingAutoPlayBlocking}
832	createdAudio.registerInDom = function() {	855		return player;
833	(document.head \|\| document.documentElement).appendChild(createdAudio);
834	createdAudio.pausedBecauseOfDomRemoval = true;
835	createdAudio.parentNode.removeChild(createdAudio);
836
837	createdAudio.removeEventListener("loadeddata", createdAudio.registerInDom);
838	};
839
840	createdAudio.replayAfterRemoval = function() {
841	if (createdAudio.pausedBecauseOfDomRemoval) {
842	if (createdAudio.paused) {
843	createdAudio.play();
844	}
845	delete createdAudio.pausedBecauseOfDomRemoval;
846
847	createdAudio.removeEventListener("pause", createdAudio.replayAfterRemoval);
848	}
849	};
850
851	createdAudio.addEventListener("loadeddata", createdAudio.registerInDom);
852	createdAudio.addEventListener("pause", createdAudio.replayAfterRemoval);
853
854	return createdAudio;
855	};	856		};
856	}`);	857		}`);
857	}	858		}
858	}	859		}
859	}	860		}
860		861
861	// PURPOSE / WEB SHARE API	862		// PURPOSE / WEB SHARE API
862	// ------------------------------------------------------------------------	863		// ------------------------------------------------------------------------
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