content/page_actions.mjs


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
46
47
48
49
50
51
52
53
54
55
56
57
58

/**
* Myext handling of page actions in content scripts
*
* Copyright (C) 2021 Wojtek Kosior
*
* Dual-licensed under:
*   - 0BSD license
*   - GPLv3 or (at your option) any later version
*/

import CONNECTION_TYPE from '/common/connection_types.mjs';
import make_once from '/common/once.mjs';
import browser from '/common/browser.mjs';

var port;
var loaded = false;
var scripts_awaiting = [];

function handle_message(message)
{
    console.log(["message", message]);

    if (message.inject === undefined)
	return;

    for (let script_text of message.inject) {
	if (loaded)
	    add_script(script_text);
	else
	    scripts_awaiting.push(script_text);
    }
}

function document_loaded(event)
{
    console.log("loaded");

    loaded = true;

    for (let script_text of scripts_awaiting)
	add_script(script_text);

    scripts_awaiting = undefined;
}

function add_script(script_text)
{
    let script = document.createElement("script");
    script.textContent = script_text;
    document.body.appendChild(script);
}

export default function main() {
    document.addEventListener("DOMContentLoaded", document_loaded);
    port = browser.runtime.connect({name : CONNECTION_TYPE.PAGE_ACTIONS});
    port.onMessage.addListener(handle_message);
    port.postMessage({url: document.URL});
}