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Play Google Drive videos on Synchtube
// ==UserScript==
// @name Google Drive Video Player for Synchtube
// @namespace gdcytube
// @description Play Google Drive videos on Synchtube
// @include http://synchtu.be/r/*
// @include https://synchtu.be/r/*
// @grant unsafeWindow
// @grant GM_xmlhttpRequest
// @connect docs.google.com
// @run-at document-end
// @version 1.1.0
// ==/UserScript==
try {
function debug(message) {
if (!unsafeWindow.enableCyTubeGoogleDriveUserscriptDebug) {
return;
}
try {
unsafeWindow.console.log(message);
} catch (error) {
unsafeWindow.console.error(error);
}
}
var ITAG_QMAP = {
37: 1080,
46: 1080,
22: 720,
45: 720,
59: 480,
44: 480,
35: 480,
18: 360,
43: 360,
34: 360
};
var ITAG_CMAP = {
43: 'video/webm',
44: 'video/webm',
45: 'video/webm',
46: 'video/webm',
18: 'video/mp4',
22: 'video/mp4',
37: 'video/mp4',
59: 'video/mp4',
35: 'video/flv',
34: 'video/flv'
};
function getVideoInfo(id, cb) {
var url = 'https://docs.google.com/file/d/' + id + '/get_video_info';
debug('Fetching ' + url);
GM_xmlhttpRequest({
method: 'GET',
url: url,
onload: function (res) {
try {
debug('Got response ' + res.responseText);
var data = {};
var error;
res.responseText.split('&').forEach(function (kv) {
var pair = kv.split('=');
data[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
});
if (data.status === 'fail') {
error = new Error('Google Docs request failed: ' +
'metadata indicated status=fail');
error.response = res.responseText;
error.reason = 'RESPONSE_STATUS_FAIL';
return cb(error);
}
if (!data.fmt_stream_map) {
error = new Error('Google Docs request failed: ' +
'metadata lookup returned no valid links');
error.response = res.responseText;
error.reason = 'MISSING_LINKS';
return cb(error);
}
data.links = {};
data.fmt_stream_map.split(',').forEach(function (item) {
var pair = item.split('|');
data.links[pair[0]] = pair[1];
});
data.videoMap = mapLinks(data.links);
cb(null, data);
} catch (error) {
unsafeWindow.console.error(error);
}
},
onerror: function () {
var error = new Error('Google Docs request failed: ' +
'metadata lookup HTTP request failed');
error.reason = 'HTTP_ONERROR';
return cb(error);
}
});
}
function mapLinks(links) {
var videos = {
1080: [],
720: [],
480: [],
360: []
};
Object.keys(links).forEach(function (itag) {
itag = parseInt(itag, 10);
if (!ITAG_QMAP.hasOwnProperty(itag)) {
return;
}
videos[ITAG_QMAP[itag]].push({
itag: itag,
contentType: ITAG_CMAP[itag],
link: links[itag]
});
});
return videos;
}
/*
* Greasemonkey 2.0 has this wonderful sandbox that attempts
* to prevent script developers from shooting themselves in
* the foot by removing the trigger from the gun, i.e. it's
* impossible to cross the boundary between the browser JS VM
* and the privileged sandbox that can run GM_xmlhttpRequest().
*
* So in this case, we have to resort to polling a special
* variable to see if getGoogleDriveMetadata needs to be called
* and deliver the result into another special variable that is
* being polled on the browser side.
*/
/*
* Browser side function -- sets gdUserscript.pollID to the
* ID of the Drive video to be queried and polls
* gdUserscript.pollResult for the result.
*/
function getGoogleDriveMetadata_GM(id, callback) {
debug('Setting GD poll ID to ' + id);
unsafeWindow.gdUserscript.pollID = id;
var tries = 0;
var i = setInterval(function () {
if (unsafeWindow.gdUserscript.pollResult) {
debug('Got result');
clearInterval(i);
var result = unsafeWindow.gdUserscript.pollResult;
unsafeWindow.gdUserscript.pollResult = null;
callback(result.error, result.result);
} else if (++tries > 100) {
// Took longer than 10 seconds, give up
clearInterval(i);
}
}, 100);
}
/*
* Sandbox side function -- polls gdUserscript.pollID for
* the ID of a Drive video to be queried, looks up the
* metadata, and stores it in gdUserscript.pollResult
*/
function setupGDPoll() {
unsafeWindow.gdUserscript = cloneInto({}, unsafeWindow);
var pollInterval = setInterval(function () {
if (unsafeWindow.gdUserscript.pollID) {
var id = unsafeWindow.gdUserscript.pollID;
unsafeWindow.gdUserscript.pollID = null;
debug('Polled and got ' + id);
getVideoInfo(id, function (error, data) {
unsafeWindow.gdUserscript.pollResult = cloneInto({
error: error,
result: data
}, unsafeWindow);
});
}
}, 1000);
}
function isRunningTampermonkey() {
try {
return GM_info.scriptHandler === 'Tampermonkey';
} catch (error) {
return false;
}
}
if (isRunningTampermonkey()) {
unsafeWindow.getGoogleDriveMetadata = getVideoInfo;
} else {
debug('Using non-TM polling workaround');
unsafeWindow.getGoogleDriveMetadata = exportFunction(
getGoogleDriveMetadata_GM, unsafeWindow);
setupGDPoll();
}
unsafeWindow.console.log('Initialized userscript Google Drive player');
unsafeWindow.hasDriveUserscript = true;
} catch (error) {
unsafeWindow.console.error(error);
}