89 lines
3.1 KiB
JavaScript
89 lines
3.1 KiB
JavaScript
// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3.0 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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import { readSimpleLength, writeSimpleLength } from './packet';
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import enums from '../enums';
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import util from '../util';
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/**
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* Implementation of the User Attribute Packet (Tag 17)
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*
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* The User Attribute packet is a variation of the User ID packet. It
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* is capable of storing more types of data than the User ID packet,
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* which is limited to text. Like the User ID packet, a User Attribute
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* packet may be certified by the key owner ("self-signed") or any other
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* key owner who cares to certify it. Except as noted, a User Attribute
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* packet may be used anywhere that a User ID packet may be used.
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*
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* While User Attribute packets are not a required part of the OpenPGP
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* standard, implementations SHOULD provide at least enough
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* compatibility to properly handle a certification signature on the
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* User Attribute packet. A simple way to do this is by treating the
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* User Attribute packet as a User ID packet with opaque contents, but
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* an implementation may use any method desired.
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*/
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class UserAttributePacket {
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constructor() {
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this.tag = enums.packet.userAttribute;
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this.attributes = [];
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}
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/**
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* parsing function for a user attribute packet (tag 17).
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* @param {Uint8Array} input payload of a tag 17 packet
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*/
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read(bytes) {
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let i = 0;
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while (i < bytes.length) {
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const len = readSimpleLength(bytes.subarray(i, bytes.length));
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i += len.offset;
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this.attributes.push(util.uint8ArrayToStr(bytes.subarray(i, i + len.len)));
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i += len.len;
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}
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}
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/**
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* Creates a binary representation of the user attribute packet
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* @returns {Uint8Array} string representation
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*/
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write() {
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const arr = [];
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for (let i = 0; i < this.attributes.length; i++) {
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arr.push(writeSimpleLength(this.attributes[i].length));
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arr.push(util.strToUint8Array(this.attributes[i]));
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}
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return util.concatUint8Array(arr);
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}
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/**
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* Compare for equality
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* @param {UserAttributePacket} usrAttr
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* @returns {Boolean} true if equal
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*/
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equals(usrAttr) {
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if (!usrAttr || !(usrAttr instanceof UserAttributePacket)) {
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return false;
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}
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return this.attributes.every(function(attr, index) {
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return attr === usrAttr.attributes[index];
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});
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}
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}
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export default UserAttributePacket;
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