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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 this code in a
* proprietary program, I am not going to enforce this in court.
*/
#FROM common/browser.js IMPORT browser
#FROM common/stored_types.js IMPORT TYPE_NAME, TYPE_PREFIX
/*
* generating unique, per-site value that can be computed synchronously
* and is impossible to guess for a malicious website
*/
/* Uint8toHex is a separate function not exported as (a) it's useful and (b) it will be used in crypto.subtle-based digests */
function Uint8toHex(data)
{
let returnValue = '';
for (let byte of data)
returnValue += ('00' + byte.toString(16)).slice(-2);
return returnValue;
}
function gen_nonce(length=16)
{
let randomData = new Uint8Array(length);
crypto.getRandomValues(randomData);
return Uint8toHex(randomData);
}
#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
/* Open settings tab with given item's editing already on. */
function open_in_settings(prefix, name)
{
name = encodeURIComponent(name);
const url = browser.runtime.getURL("html/options.html#" + prefix + name);
window.open(url, "_blank");
}
#EXPORT open_in_settings
/*
* Check if url corresponds to a browser's special page (or a directory index in
* case of `file://' protocol).
*/
const privileged_reg =
/^(chrome(-extension)?|moz-extension):\/\/|^about:|^file:\/\/.*\/$/;
#EXPORT url => privileged_reg.test(url) AS is_privileged_url
/* Parse a CSP header */
function parse_csp(csp) {
let directive, directive_array;
let directives = {};
for (directive of csp.split(';')) {
directive = directive.trim();
if (directive === '')
continue;
directive_array = directive.split(/\s+/);
directive = directive_array.shift();
/* The "true" case should never occur; nevertheless... */
directives[directive] = directive in directives ?
directives[directive].concat(directive_array) :
directive_array;
}
return directives;
}
/* Regexes and objects to use as/in schemas for parse_json_with_schema(). */
const nonempty_string_matcher = /.+/;
const matchers = {
sha256: /^[0-9a-f]{64}$/,
nonempty_string: nonempty_string_matcher,
component: [
new RegExp(`^[${TYPE_PREFIX.SCRIPT}${TYPE_PREFIX.BAG}]$`),
nonempty_string_matcher
]
};
#EXPORT matchers
/*
* Facilitates checking if there aren't any keys in object. This does *NOT*
* account for pathological cases like redefined properties of Object prototype.
*/
function is_object_empty(object)
{
for (const key in object)
return false;
return true;
}
#EXPORT is_object_empty
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