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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 <http://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1+
*
* Author(s):
* Maximilian Krambach <[email protected]>
*/
/* global chrome */
import { permittedOperations } from './permittedOperations';
import { gpgme_error } from './Errors';
import { GPGME_Message, createMessage } from './Message';
/**
* A Connection handles the nativeMessaging interaction.
*/
export class Connection{
constructor(){
this.connect();
}
/**
* Retrieves the information about the backend.
* @param {Boolean} details (optional) If set to false, the promise will
* just return a connection status
* @returns {Promise<Object>}
* {String} The property 'gpgme': Version number of gpgme
* {Array<Object>} 'info' Further information about the backends.
* Example:
* "protocol": "OpenPGP",
* "fname": "/usr/bin/gpg",
* "version": "2.2.6",
* "req_version": "1.4.0",
* "homedir": "default"
*/
checkConnection(details = true){
if (details === true) {
return this.post(createMessage('version'));
} else {
let me = this;
return new Promise(function(resolve) {
Promise.race([
me.post(createMessage('version')),
new Promise(function(resolve, reject){
setTimeout(function(){
reject(gpgme_error('CONN_TIMEOUT'));
}, 500);
})
]).then(function(){ // success
resolve(true);
}, function(){ // failure
resolve(false);
});
});
}
}
/**
* Immediately closes the open port.
*/
disconnect() {
if (this._connection){
this._connection.disconnect();
this._connection = null;
}
}
/**
* Opens a nativeMessaging port.
*/
connect(){
if (!this._connection){
this._connection = chrome.runtime.connectNative('gpgmejson');
}
}
/**
* Sends a message and resolves with the answer.
* @param {GPGME_Message} message
* @returns {Promise<Object>} the gnupg answer, or rejection with error
* information.
*/
post(message){
if (!message || !(message instanceof GPGME_Message)){
this.disconnect();
return Promise.reject(gpgme_error(
'PARAM_WRONG', 'Connection.post'));
}
if (message.isComplete !== true){
this.disconnect();
return Promise.reject(gpgme_error('MSG_INCOMPLETE'));
}
let me = this;
let chunksize = message.chunksize;
return new Promise(function(resolve, reject){
let answer = new Answer(message);
let listener = function(msg) {
if (!msg){
me._connection.onMessage.removeListener(listener);
me._connection.disconnect();
reject(gpgme_error('CONN_EMPTY_GPG_ANSWER'));
} else {
let answer_result = answer.collect(msg);
if (answer_result !== true){
me._connection.onMessage.removeListener(listener);
me._connection.disconnect();
reject(answer_result);
} else {
if (msg.more === true){
me._connection.postMessage({
'op': 'getmore',
'chunksize': chunksize
});
} else {
me._connection.onMessage.removeListener(listener);
me._connection.disconnect();
if (answer.message instanceof Error){
reject(answer.message);
} else {
resolve(answer.message);
}
}
}
}
};
me._connection.onMessage.addListener(listener);
if (permittedOperations[message.operation].pinentry){
return me._connection.postMessage(message.message);
} else {
return Promise.race([
me._connection.postMessage(message.message),
function(resolve, reject){
setTimeout(function(){
me._connection.disconnect();
reject(gpgme_error('CONN_TIMEOUT'));
}, 5000);
}]).then(function(result){
return result;
}, function(reject){
if(!(reject instanceof Error)) {
me._connection.disconnect();
return gpgme_error('GNUPG_ERROR', reject);
} else {
return reject;
}
});
}
});
}
}
/**
* A class for answer objects, checking and processing the return messages of
* the nativeMessaging communication.
* @param {String} operation The operation, to look up validity of returning
* messages
*/
class Answer{
constructor(message){
this.operation = message.operation;
this.expect = message.expect;
}
collect(msg){
if (typeof(msg) !== 'object' || !msg.hasOwnProperty('response')) {
return gpgme_error('CONN_UNEXPECTED_ANSWER');
}
if (this._responseb64 === undefined){
//this._responseb64 = [msg.response];
this._responseb64 = msg.response;
return true;
} else {
//this._responseb64.push(msg.response);
this._responseb64 += msg.response;
return true;
}
}
get message(){
if (this._responseb64 === undefined){
return gpgme_error('CONN_UNEXPECTED_ANSWER');
}
// let _decodedResponse = JSON.parse(atob(this._responseb64.join('')));
let _decodedResponse = JSON.parse(atob(this._responseb64));
let _response = {};
let messageKeys = Object.keys(_decodedResponse);
let poa = permittedOperations[this.operation].answer;
if (messageKeys.length === 0){
return gpgme_error('CONN_UNEXPECTED_ANSWER');
}
for (let i= 0; i < messageKeys.length; i++){
let key = messageKeys[i];
switch (key) {
case 'type':
if (_decodedResponse.type === 'error'){
return (gpgme_error('GNUPG_ERROR', _decodedResponse.msg));
} else if (poa.type.indexOf(_decodedResponse.type) < 0){
return gpgme_error('CONN_UNEXPECTED_ANSWER');
}
break;
case 'base64':
break;
case 'msg':
if (_decodedResponse.type === 'error'){
return (gpgme_error('GNUPG_ERROR', _decodedResponse.msg));
}
break;
default:
if (!poa.data.hasOwnProperty(key)){
return gpgme_error('CONN_UNEXPECTED_ANSWER');
}
if( typeof(_decodedResponse[key]) !== poa.data[key] ){
return gpgme_error('CONN_UNEXPECTED_ANSWER');
}
if (_decodedResponse.base64 === true
&& poa.data[key] === 'string'
&& this.expect === undefined
){
_response[key] = decodeURIComponent(
atob(_decodedResponse[key]).split('').map(
function(c) {
return '%' +
('00' + c.charCodeAt(0).toString(16)).slice(-2);
}).join(''));
} else {
_response[key] = _decodedResponse[key];
}
break;
}
}
return _response;
}
}
|
