Calixte Denizet 8bff4f1ea9 In order to simplify m-c code, move some in pdf.js
* move set/clear|Timeout/Interval and crackURL code in pdf.js
 * remove the "backdoor" in the proxy (used to dispatch event) and so return the dispatch function in the initializer
 * remove listeners if an error occured during sandbox initialization
 * add support for alert and prompt in the sandbox
 * add a function to eval in the global scope
2020-12-17 15:03:26 +01:00

115 lines
2.8 KiB
JavaScript

/* Copyright 2020 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class ProxyHandler {
get(obj, prop) {
// script may add some properties to the object
if (prop in obj._expandos) {
const val = obj._expandos[prop];
if (typeof val === "function") {
return val.bind(obj);
}
return val;
}
if (typeof prop === "string" && !prop.startsWith("_") && prop in obj) {
// return only public properties
// i.e. the ones not starting with a '_'
const val = obj[prop];
if (typeof val === "function") {
return val.bind(obj);
}
return val;
}
return undefined;
}
set(obj, prop, value) {
if (typeof prop === "string" && !prop.startsWith("_") && prop in obj) {
const old = obj[prop];
obj[prop] = value;
if (obj._send && obj._id !== null && typeof old !== "function") {
const data = { id: obj._id };
data[prop] = obj[prop];
// send the updated value to the other side
obj._send(data);
}
} else {
obj._expandos[prop] = value;
}
return true;
}
has(obj, prop) {
return (
prop in obj._expandos ||
(typeof prop === "string" && !prop.startsWith("_") && prop in obj)
);
}
getPrototypeOf(obj) {
return null;
}
setPrototypeOf(obj, proto) {
return false;
}
isExtensible(obj) {
return true;
}
preventExtensions(obj) {
return false;
}
getOwnPropertyDescriptor(obj, prop) {
if (prop in obj._expandos) {
return {
configurable: true,
enumerable: true,
value: obj._expandos[prop],
};
}
if (typeof prop === "string" && !prop.startsWith("_") && prop in obj) {
return { configurable: true, enumerable: true, value: obj[prop] };
}
return undefined;
}
defineProperty(obj, key, descriptor) {
Object.defineProperty(obj._expandos, key, descriptor);
return true;
}
deleteProperty(obj, prop) {
if (prop in obj._expandos) {
delete obj._expandos[prop];
}
}
ownKeys(obj) {
const fromExpandos = Reflect.ownKeys(obj._expandos);
const fromObj = Reflect.ownKeys(obj).filter(k => !k.startsWith("_"));
return fromExpandos.concat(fromObj);
}
}
export { ProxyHandler };