-
Notifications
You must be signed in to change notification settings - Fork 31
/
receiver.js
47 lines (39 loc) · 1.62 KB
/
receiver.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
// This script is injected in the page to handle javascript injections.
// In manifest v3 it is no longer possible to inject arbitrary user-written JS into the page easily.
// That is why we're currently always injecting this script first.
// This script creates an event target that listens for manipulation events.
// Such an event can be triggered by the extension to inject custom user-written JS.
// Array that consists of ['filename', element] pairs.
let added_js = [];
// Create a DOM EventTarget object
var target = document.createElement('span');
target.setAttribute("id", "page-manipulator-event-target");
// Pass EventTarget interface calls to DOM EventTarget object
target.addEventListener = target.addEventListener.bind(target);
target.removeEventListener = target.removeEventListener.bind(target);
target.dispatchEvent = target.dispatchEvent.bind(target);
// Add the 'manipulate' listener to the target.
target.addEventListener("manipulate", function(e) {
let head = document.head;
let script = document.createElement("script");
script.textContent = e.detail.code;
head.appendChild(script);
added_js.push([e.detail.filename, script]);
return true;
});
// Add the 'remove-manipulation' listener to the target.
target.addEventListener("remove-manipulation", function(e) {
for(let element of added_js)
{
if(element[0] === e.detail.filename)
{
let index = added_js.indexOf(element);
element[1].remove();
added_js.splice(index, 1);
break;
}
}
return true;
});
// Add the target to the DOM.
document.head.appendChild(target);