- // ==UserScript==
- // @name EME Logger
- // @namespace http://greasyfork.org/
- // @version 0.4
- // @description Inject EME interface and log its function calls.
- // @author cramer
- // @match *://*/*
- // @run-at document-start
- // @grant none
- // ==/UserScript==
-
- (async () => {
- const indent = (s,n=4) => s.split('\n').map(l=>Array(n).fill(' ').join('')+l).join('\n');
-
- const b64 = {
- decode: s => Uint8Array.from(atob(s), c => c.charCodeAt(0)),
- encode: b => btoa(String.fromCharCode(...new Uint8Array(b)))
- };
-
- const fnproxy = (object, func) => new Proxy(object, { apply: func });
-
- const proxy = (object, key, func) => Object.defineProperty(object, key, {
- value: fnproxy(object[key], func)
- });
-
- proxy(Navigator.prototype, 'requestMediaKeySystemAccess', async (_target, _this, _args) => {
- const [keySystem, supportedConfigurations] = _args;
- console.log(
- `[EME] Navigator::requestMediaKeySystemAccess\n` +
- ` Key System: ${keySystem}\n` +
- ` Supported Configurations:\n` +
- indent(JSON.stringify(supportedConfigurations, null, ' '))
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeySystemAccess.prototype, 'createMediaKeys', async (_target, _this, _args) => {
- console.log(
- `[EME] MediaKeySystemAccess::createMediaKeys\n` +
- ` Key System: ${_this.keySystem}\n` +
- ` Configurations:\n` +
- indent(JSON.stringify(_this.getConfiguration(), null, ' '))
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeys.prototype, 'setServerCertificate', async (_target, _this, _args) => {
- const [serverCertificate] = _args;
- console.log(
- `[EME] MediaKeys::setServerCertificate\n` +
- ` Server Certificate: ${b64.encode(serverCertificate)}`
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- function messageHandler(event) {
- const keySession = event.target;
- const {sessionId} = keySession;
- const {message, messageType} = event;
- const listeners = keySession.getEventListeners('message').filter(l => l !== messageHandler);
- console.log(
- `[EME] MediaKeySession::message\n` +
- ` Session ID: ${sessionId || '(not available)'}\n` +
- ` Message Type: ${messageType}\n` +
- ` Message: ${b64.encode(message)}` +
- '\n Listeners:', listeners
- );
- console.trace();
- }
-
- function keystatuseschangeHandler(event) {
- const keySession = event.target;
- const {sessionId} = keySession;
- const listeners = keySession.getEventListeners('keystatuseschange').filter(l => l !== keystatuseschangeHandler);
- console.log(
- `[EME] MediaKeySession::keystatuseschange\n` +
- ` Session ID: ${sessionId || '(not available)'}\n` +
- Array.from(keySession.keyStatuses).map(([keyId, status]) =>
- ` [${status.toUpperCase()}] ${b64.encode(keyId)}`
- ).join('\n') +
- '\n Listeners:', listeners
- );
- console.trace();
- }
-
- proxy(MediaKeys.prototype, 'createSession', (_target, _this, _args) => {
- const [sessionType] = _args;
- console.log(
- `[EME] MediaKeys::createSession\n` +
- ` Session Type: ${sessionType || 'temporary (default)'}`
- );
- console.trace();
- const session = _target.apply(_this, _args);
- session.addEventListener('message', messageHandler);
- session.addEventListener('keystatuseschange', keystatuseschangeHandler);
- return session;
- });
-
- function getEventListeners(type) {
- const store = this[Symbol.for(getEventListeners)];
- if (store == null || store[type] == null) return [];
- return store[type];
- }
-
- EventTarget.prototype.getEventListeners = getEventListeners;
-
- proxy(EventTarget.prototype, 'addEventListener', async (_target, _this, _args) => {
- const [type, listener] = _args;
- const storeKey = Symbol.for(getEventListeners);
- if (!(storeKey in _this)) _this[storeKey] = {};
- const store = _this[storeKey];
- if (!(type in store)) store[type] = [];
- const listeners = store[type];
- if (listeners.indexOf(listener) < 0) {
- listeners.push(listener);
- }
- return _target.apply(_this, _args);
- });
-
- proxy(EventTarget.prototype, 'removeEventListener', async (_target, _this, _args) => {
- const [type, listener] = _args;
- const storeKey = Symbol.for(getEventListeners);
- if (!(storeKey in _this)) return;
- const store = _this[storeKey];
- if (!(type in store)) return;
- const listeners = store[type];
- const index = listeners.indexOf(listener);
- if (index >= 0) {
- if (listeners.length === 1) {
- delete store[type];
- } else {
- listeners.splice(index, 1);
- }
- }
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeySession.prototype, 'generateRequest', async (_target, _this, _args) => {
- const [initDataType, initData] = _args;
- console.log(
- `[EME] MediaKeySession::generateRequest\n` +
- ` Session ID: ${_this.sessionId || '(not available)'}\n` +
- ` Init Data Type: ${initDataType}\n` +
- ` Init Data: ${b64.encode(initData)}`
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeySession.prototype, 'load', async (_target, _this, _args) => {
- const [sessionId] = _args;
- console.log(
- `[EME] MediaKeySession::load\n` +
- ` Session ID: ${sessionId || '(not available)'}`
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeySession.prototype, 'update', async (_target, _this, _args) => {
- const [response] = _args;
- console.log(
- `[EME] MediaKeySession::update\n` +
- ` Session ID: ${_this.sessionId || '(not available)'}\n` +
- ` Response: ${b64.encode(response)}`
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeySession.prototype, 'close', async (_target, _this, _args) => {
- console.log(
- `[EME] MediaKeySession::close\n` +
- ` Session ID: ${_this.sessionId || '(not available)'}`
- );
- console.trace();
- return _target.apply(_this, _args);
- });
-
- proxy(MediaKeySession.prototype, 'remove', async (_target, _this, _args) => {
- console.log(
- `[EME] MediaKeySession::remove\n` +
- ` Session ID: ${_this.sessionId || '(not available)'}`
- );
- console.trace();
- return _target.apply(_this, _args);
- });
- })();