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/* gpgme.js - Javascript integration for gpgme
* Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
*
* This file is part of GPGME.
*
* GPGME is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* GPGME 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1+
*
* Author(s):
* Maximilian Krambach <[email protected]>
*/
import { gpgme_error } from './Errors';
/**
* Helper function that tries to return an array of fingerprints, either from
* input fingerprints or from Key objects (openpgp Keys or GPGME_Keys are both
* accepted).
*
* @param {Object | Object[] | String | String[] } input
* @returns {String[]} Array of fingerprints, or an empty array
*/
export function toKeyIdArray (input){
if (!input){
return [];
}
if (!Array.isArray(input)){
input = [input];
}
let result = [];
for (let i=0; i < input.length; i++){
if (typeof (input[i]) === 'string'){
if (isFingerprint(input[i]) === true){
result.push(input[i]);
} else {
// MSG_NOT_A_FPR is just a console warning if warning enabled
// in src/Errors.js
gpgme_error('MSG_NOT_A_FPR');
}
} else if (typeof (input[i]) === 'object'){
let fpr = '';
if (input[i].fingerprint !== undefined){
fpr = input[i].fingerprint;
} else if (input[i].hasOwnProperty('primaryKey') &&
input[i].primaryKey.hasOwnProperty('getFingerprint')){
fpr = input[i].primaryKey.getFingerprint();
}
if (isFingerprint(fpr) === true){
result.push(fpr);
} else {
gpgme_error('MSG_NOT_A_FPR');
}
} else {
return gpgme_error('PARAM_WRONG');
}
}
if (result.length === 0){
return [];
} else {
return result;
}
}
/**
* Check if values are valid hexadecimal values of a specified length
* @param {String} key input value.
* @param {int} len the expected length of the value
* @returns {Boolean} true if value passes test
* @private
*/
function hextest (key, len){
if (!key || typeof (key) !== 'string'){
return false;
}
if (key.length !== len){
return false;
}
let regexp= /^[0-9a-fA-F]*$/i;
return regexp.test(key);
}
/**
* Checks if the input is a valid Fingerprint
* (Hex string with a length of 40 characters)
* @param {String} value to check
* @returns {Boolean} true if value passes test
*/
export function isFingerprint (value){
return hextest(value, 40);
}
/**
* check if the input is a valid gnupg long ID (Hex string with a length of 16
* characters)
* @param {String} value to check
* @returns {Boolean} true if value passes test
*/
export function isLongId (value){
return hextest(value, 16);
}
/**
* Recursively decodes input (utf8) to output (utf-16; javascript) strings.
* @param {Object | Array | String} property
* @private
*/
export function decode (property){
if (typeof property === 'string'){
try {
return decodeURIComponent(escape(unescape(property)));
}
catch (error){
if (error instanceof URIError) {
return property;
}
}
} else if (Array.isArray(property)){
let res = [];
for (let arr=0; arr < property.length; arr++){
res.push(decode(property[arr]));
}
return res;
} else if (typeof property === 'object'){
const keys = Object.keys(property);
if (keys.length){
let res = {};
for (let k=0; k < keys.length; k++ ){
res[keys[k]] = decode(property[keys[k]]);
}
return res;
}
return property;
}
return property;
}
/**
* Turns a base64 encoded string into an uint8 array
* adapted from https://gist.github.com/borismus/1032746
* @param {String} base64 encoded String
* @returns {Uint8Array}
* @private
*/
export function atobArray (base64) {
if (typeof (base64) !== 'string'){
throw gpgme_error('DECODE_FAIL');
}
const raw = window.atob(base64);
const rawLength = raw.length;
let array = new Uint8Array(new ArrayBuffer(rawLength));
for (let i = 0; i < rawLength; i++) {
array[i] = raw.charCodeAt(i);
}
return array;
}
/**
* Turns a Uint8Array into an utf8-String
* <pre>
* Taken and slightly adapted from
* https://www.onicos.com/staff/iz/amuse/javascript/expert/utf.txt
* (original header:
* utf.js - UTF-8 <=> UTF-16 conversion
*
* Copyright (C) 1999 Masanao Izumo <[email protected]>
* Version: 1.0
* LastModified: Dec 25 1999
* This library is free. You can redistribute it and/or modify it.
* )
* </pre>
* @param {*} array Uint8Array
* @returns {String}
* @private
*/
export function Utf8ArrayToStr (array) {
let out, i, len, c, char2, char3;
out = '';
len = array.length;
i = 0;
if (array instanceof Uint8Array === false){
throw gpgme_error('DECODE_FAIL');
}
while (i < len) {
c = array[i++];
switch (c >> 4) {
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out += String.fromCharCode(c);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = array[i++];
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = array[i++];
char3 = array[i++];
out += String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
default:
break;
}
}
return out;
}
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