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cd5272ac
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Wojtek Kosior
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/**
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2bd35bc4
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Wojtek Kosior
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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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cd5272ac
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Wojtek Kosior
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*
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* Copyright (C) 2021 Wojtek Kosior
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dcfc78b0
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jahoti
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* Copyright (C) 2021 jahoti
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263d03d5
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jahoti
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* As additional permission under GNU GPL version 3 section 7, you
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* may distribute forms of that code without the copy of the GNU
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* GPL normally required by section 4, provided you include this
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* license notice and, in case of non-source distribution, a URL
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* through which recipients can access the Corresponding Source.
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* If you modify file(s) with this exception, you may extend this
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* exception to your version of the file(s), but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*
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* As a special exception to the GPL, any HTML file which merely
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* makes function calls to this code, and for that purpose
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* includes it by reference shall be deemed a separate work for
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* copyright law purposes. If you modify this code, you may extend
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* this exception to your version of the code, but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
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372d24ea
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Wojtek Kosior
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* license. Although I request that you do not make use of this code in a
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263d03d5
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jahoti
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* proprietary program, I am not going to enforce this in court.
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cd5272ac
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Wojtek Kosior
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*/
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7218849a
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Wojtek Kosior
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/* uint8_to_hex is a separate function used in cryptographic functions. */
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const uint8_to_hex =
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array => [...array].map(b => ("0" + b.toString(16)).slice(-2)).join("");
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cd5272ac
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Wojtek Kosior
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/*
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7218849a
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Wojtek Kosior
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* Asynchronously compute hex string representation of a sha256 digest of a
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* UTF-8 string.
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cd5272ac
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Wojtek Kosior
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*/
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7218849a
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Wojtek Kosior
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async function sha256_async(string) {
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const input_ab = new TextEncoder("utf-8").encode(string);
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const digest_ab = await crypto.subtle.digest("SHA-256", input_ab);
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return uint8_to_hex(new Uint8Array(digest_ab));
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dcfc78b0
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jahoti
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}
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7218849a
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Wojtek Kosior
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#EXPORT sha256_async
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dcfc78b0
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jahoti
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7218849a
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Wojtek Kosior
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/*
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* Generate a unique value that can be computed synchronously and is impossible
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* to guess for a malicious website.
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*/
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e2d26bad
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Wojtek Kosior
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function gen_nonce(length=16)
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dcfc78b0
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jahoti
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{
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7218849a
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Wojtek Kosior
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const random_data = new Uint8Array(length);
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crypto.getRandomValues(random_data);
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return uint8_to_hex(random_data);
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dcfc78b0
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jahoti
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}
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b590eaa2
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Wojtek Kosior
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#EXPORT gen_nonce
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dcfc78b0
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jahoti
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d09b7ee1
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Wojtek Kosior
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/* Check if some HTTP header might define CSP rules. */
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44e89d8e
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Wojtek Kosior
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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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b590eaa2
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Wojtek Kosior
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#EXPORT csp_header_regex
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d09b7ee1
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Wojtek Kosior
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b7e2870f
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Wojtek Kosior
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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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b590eaa2
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Wojtek Kosior
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#EXPORT (prefix, name) => `${name} (${TYPE_NAME[prefix]})` AS nice_name
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b7e2870f
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Wojtek Kosior
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53837634
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Wojtek Kosior
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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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9d825eaa
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Wojtek Kosior
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#IF MOZILLA
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const priv_reg = /^moz-extension:\/\/|^about:|^file:\/\/[^?#]*\/([?#]|$)/;
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#ELIF CHROMIUM
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const priv_reg = /^chrome(-extension)?:\/\/|^about:|^file:\/\/[^?#]*\/([?#]|$)/;
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#ENDIF
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#EXPORT url => priv_reg.test(url) AS is_privileged_url
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