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/**
* Myext injecting policy to page using webRequest
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*/
/*
* IMPORTS_START
* IMPORT TYPE_PREFIX
* IMPORT get_storage
* IMPORT browser
* IMPORT is_chrome
* IMPORT gen_unique
* IMPORT url_item
* IMPORT get_query_best
* IMPORT csp_rule
* IMPORTS_END
*/
var storage;
var query_best;
const csp_header_names = {
"content-security-policy" : true,
"x-webkit-csp" : true,
"x-content-security-policy" : true
};
const header_name = "content-security-policy";
function is_csp_header(header)
{
return !!csp_header_names[header.name.toLowerCase()];
}
function is_our_header(header, rule)
{
return header.value === rule
}
function inject(details)
{
const url = url_item(details.url);
const [pattern, settings] = query_best(url);
const nonce = gen_unique(url);
const rule = csp_rule(nonce);
var headers;
if (settings !== undefined && settings.allow) {
/*
* Chrome doesn't have the buggy behavior of repeatedly injecting a
* header we injected once. Firefox does and we have to remove it there.
*/
if (is_chrome)
return {cancel: false};
headers = details.responseHeaders.filter(h => !is_our_header(h, rule));
} else {
headers = details.responseHeaders.filter(h => !is_csp_header(h));
headers.push({
name : header_name,
value : rule
});
}
return {responseHeaders: headers};
}
async function start_policy_injector()
{
storage = await get_storage();
query_best = await get_query_best();
let extra_opts = ["blocking", "responseHeaders"];
if (is_chrome)
extra_opts.push("extraHeaders");
browser.webRequest.onHeadersReceived.addListener(
inject,
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame"]
},
extra_opts
);
}
/*
* EXPORTS_START
* EXPORT start_policy_injector
* EXPORTS_END
*/
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