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/**
* This file is part of Haketilo.
*
* Function: Miscellaneous operations refactored to a separate file.
*
* Copyright (C) 2021 Wojtek Kosior
* Copyright (C) 2021 jahoti
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
/* uint8_to_hex is a separate function used in cryptographic functions. */
const uint8_to_hex =
array => [...array].map(b => ("0" + b.toString(16)).slice(-2)).join("");
/*
* Asynchronously compute hex string representation of a sha256 digest of a
* UTF-8 string.
*/
async function sha256_async(string) {
const input_ab = new TextEncoder("utf-8").encode(string);
const digest_ab = await crypto.subtle.digest("SHA-256", input_ab);
return uint8_to_hex(new Uint8Array(digest_ab));
}
#EXPORT sha256_async
/*
* Generate a unique value that can be computed synchronously and is impossible
* to guess for a malicious website.
*/
function gen_nonce(length=16)
{
const random_data = new Uint8Array(length);
crypto.getRandomValues(random_data);
return uint8_to_hex(random_data);
}
#EXPORT gen_nonce
/* Check if some HTTP header might define CSP rules. */
const csp_header_regex =
/^\s*(content-security-policy|x-webkit-csp|x-content-security-policy)/i;
#EXPORT csp_header_regex
/*
* Print item together with type, e.g.
* nice_name("s", "hello") → "hello (script)"
*/
#EXPORT (prefix, name) => `${name} (${TYPE_NAME[prefix]})` AS nice_name
/*
* Check if url corresponds to a browser's special page (or a directory index in
* case of `file://' protocol).
*/
#IF MOZILLA
const priv_reg = /^moz-extension:\/\/|^about:|^file:\/\/[^?#]*\/([?#]|$)/;
#ELIF CHROMIUM
const priv_reg = /^chrome(-extension)?:\/\/|^about:|^file:\/\/[^?#]*\/([?#]|$)/;
#ENDIF
#EXPORT url => priv_reg.test(url) AS is_privileged_url
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