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// ==UserScript==
// @name Autostop
// @description Autoplay sucks, even on youtube
// @namespace github.com/seebye/autostop
// @match <all_urls>
// @run-at document-start
// ==/UserScript==
/*
Copyright (C) 2017 Nico Baeurer
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
(function() {
"use strict";
let playable = false;
let proto = (() => {
let iframe = document.createElement('iframe');
let protos = {};
try {
iframe.sandbox = 'allow-same-origin';
document.documentElement.insertBefore(iframe, document.documentElement.firstChild);
for (let i of Object.getOwnPropertyNames(iframe.contentWindow)) {
try {
protos[i] = iframe.contentWindow[i].prototype;
}
catch (e) {
// some members are still protected (cross origin)
}
}
return protos;
}
finally {
document.documentElement.removeChild(iframe);
}
})();
let accessUnmodified = function(target, cb) {
let tmp = target.__proto__;
try {
target.__proto__ = proto[tmp.constructor.name];
return cb(target);
}
finally {
target.__proto__ = tmp;
}
};
let hook = function(proto) {
let helper = {};
for (let member in proto) {
try {
if (proto[member] instanceof Function) {
helper[member] = {
override: function(creator) {
proto[member] = creator(proto[member]);
return helper;
}
};
}
}
catch (e) {
helper[member] = {
property: function({getter, setter=() => {}}) {
Object.defineProperty(proto, member, {
get: getter,
configurable: false,
enumerable: true,
set: setter
});
return helper;
},
constant: function(val) {
Object.defineProperty(proto, member, {
value: val,
configurable: false,
enumerable: true
});
return helper;
}
};
}
}
return helper;
};
let disableAutoplay = function(target) {
for (let v of target.getElementsByTagName('video')) {
v.pause();
}
};
let onceTrustedEvent = function(target, ev, cb) {
target.addEventListener(ev, (() => {
let listener = (e) => {
if (e.isTrusted) {
target.removeEventListener(ev, listener);
cb(e);
}
};
return listener;
})());
};
let init = (function() {
onceTrustedEvent(document, "click", (e) => {
playable = true;
});
hook(window.HTMLMediaElement.prototype)
// block javascript code from playing a video till the first user interaction
.play.override((orig) => function() {
try {
return orig.apply(this);
}
finally {
// pause video instead of block calling play
// (e.g. youtube produces a high load otherwise..)
if (!playable) {
this.pause();
}
}
})
// block javascript code from enabling autoplay
.autoplay.property({getter: function() {
return accessUnmodified(this, (self) => self.autoplay);
}});
// disable autoplay via html attribute
hook(window.Element.prototype)
.innerHTML.property({
getter: function() {
return accessUnmodified(this, (self) => self.innerHTML);
},
setter: function(val) {
accessUnmodified(this, (self) => {
self.innerHTML = val;
});
disableAutoplay(this);
}});
document.addEventListener("DOMContentLoaded", (e) => {
disableAutoplay(document);
}, {once: true});
})();
})();
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