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/**
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* This file is part of Haketilo.
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*
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* Function: Miscellaneous operations refactored to a separate file.
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*
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* Copyright (C) 2021 Wojtek Kosior
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* Copyright (C) 2021 jahoti
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* Redistribution terms are gathered in the `copyright' file.
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*/
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/*
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* IMPORTS_START
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* IMPORT browser
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* IMPORT TYPE_NAME
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* IMPORT TYPE_PREFIX
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* IMPORTS_END
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*/
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/* Generate a random base64-encoded 128-bit sequence */
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function gen_nonce()
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{
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let randomData = new Uint8Array(16);
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crypto.getRandomValues(randomData);
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return btoa(String.fromCharCode.apply(null, randomData));
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}
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/*
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* generating unique, per-site value that can be computed synchronously
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* and is impossible to guess for a malicious website
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*/
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/* Uint8toHex is a separate function not exported as (a) it's useful and (b) it will be used in crypto.subtle-based digests */
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function Uint8toHex(data)
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{
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let returnValue = '';
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for (let byte of data)
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returnValue += ('00' + byte.toString(16)).slice(-2);
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return returnValue;
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}
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function gen_nonce(length=16)
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{
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let randomData = new Uint8Array(length);
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crypto.getRandomValues(randomData);
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return Uint8toHex(randomData);
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}
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/* CSP rule that blocks scripts according to policy's needs. */
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function make_csp_rule(policy)
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{
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let rule = "prefetch-src 'none'; script-src-attr 'none';";
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const script_src = policy.nonce !== undefined ?
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`'nonce-${policy.nonce}'` : "'none'";
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rule += ` script-src ${script_src}; script-src-elem ${script_src};`;
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return rule;
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}
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/* Check if some HTTP header might define CSP rules. */
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const csp_header_regex =
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/^\s*(content-security-policy|x-webkit-csp|x-content-security-policy)/i;
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/*
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* Print item together with type, e.g.
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* nice_name("s", "hello") → "hello (script)"
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*/
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function nice_name(prefix, name)
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{
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return `${name} (${TYPE_NAME[prefix]})`;
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}
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/* Open settings tab with given item's editing already on. */
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function open_in_settings(prefix, name)
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{
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name = encodeURIComponent(name);
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const url = browser.runtime.getURL("html/options.html#" + prefix + name);
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window.open(url, "_blank");
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}
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/*
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* Check if url corresponds to a browser's special page (or a directory index in
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* case of `file://' protocol).
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*/
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const privileged_reg =
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/^(chrome(-extension)?|moz-extension):\/\/|^about:|^file:\/\/.*\/$/;
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const is_privileged_url = url => privileged_reg.test(url);
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/* Parse a CSP header */
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function parse_csp(csp) {
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let directive, directive_array;
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let directives = {};
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for (directive of csp.split(';')) {
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directive = directive.trim();
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if (directive === '')
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continue;
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directive_array = directive.split(/\s+/);
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directive = directive_array.shift();
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/* The "true" case should never occur; nevertheless... */
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directives[directive] = directive in directives ?
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directives[directive].concat(directive_array) :
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directive_array;
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}
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return directives;
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}
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/* Regexes and objects to use as/in schemas for parse_json_with_schema(). */
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const nonempty_string_matcher = /.+/;
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const matchers = {
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sha256: /^[0-9a-f]{64}$/,
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nonempty_string: nonempty_string_matcher,
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component: [
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new RegExp(`^[${TYPE_PREFIX.SCRIPT}${TYPE_PREFIX.BAG}]$`),
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nonempty_string_matcher
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]
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};
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/*
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* EXPORTS_START
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* EXPORT gen_nonce
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* EXPORT make_csp_rule
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* EXPORT csp_header_regex
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* EXPORT nice_name
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* EXPORT open_in_settings
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* EXPORT is_privileged_url
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* EXPORT matchers
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* EXPORTS_END
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*/
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