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import { GPGME_Message } from "./Message";
/* 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+
*/
/**
* A connection port will be opened for each communication between gpgmejs and
* gnupg. It should be alive as long as there are additional messages to be
* expected.
*/
import { permittedOperations } from './permittedOperations'
export class Connection{
/**
* Opens and closes a port. Thus, it is made sure that the connection can
* be used.
* THIS BEHAVIOUR MAY CHANGE!
* discussion is to keep a port alive as long as the context stays the same
*
* TODO returns nothing, but triggers exceptions if not successfull
*/
constructor(){
this._connection = chrome.runtime.connectNative('gpgmejson');
if (!this._connection){
if (chrome.runtime.lastError){
throw('NO_CONNECT_RLE');
} else {
throw('NO_CONNECT');
}
}
this._flags = {}; // TODO general config
}
/**
* Immediately closes the open port
*/
disconnect() {
if (this._connection){
this._connection.disconnect();
}
}
/**
* Sends a message and resolves with the answer.
* @param {GPGME_Message} message
* @returns {Promise<Object>} the gnupg answer, or rejection with error
* information
* TODO: better/more consistent error information
*/
post(message){
if (!message || !message instanceof GPGME_Message){
return Promise.reject('ERR_NO_MSG');
}
// let timeout = 5000; //TODO config
let me = this;
return new Promise(function(resolve, reject){
let answer = new Answer(message.op);
let listener = function(msg) {
if (!msg){
me._connection.onMessage.removeListener(listener)
reject('EMPTY_ANSWER');
} else if (msg.type === "error"){
me._connection.onMessage.removeListener(listener)
reject(msg.msg);
} else {
answer.add(msg);
if (msg.more === true){
me._connection.postMessage({'op': 'getmore'});
} else {
me._connection.onMessage.removeListener(listener)
resolve(answer.message);
}
}
};
me._connection.onMessage.addListener(listener);
me._connection.postMessage(message);
//TBD: needs to be aware if there is a pinentry pending
// setTimeout(
// function(){
// me.disconnect();
// reject('TIMEOUT');
// }, timeout);
});
}
};
/**
* 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 return keys
*/
class Answer{
constructor(operation){
this.operation = operation;
}
/**
*
* @param {Object} msg The message as received with nativeMessaging
* TODO: "error" and "more" handling are not in here, but in post()
*/
add(msg){
if (this._response === undefined){
this._response = {};
}
let messageKeys = Object.keys(msg);
let poa = permittedOperations[this.operation].answer;
for (let i= 0; i < messageKeys.length; i++){
let key = messageKeys[i];
switch (key) {
case 'type':
if ( msg.type !== 'error' && poa.type.indexOf(msg.type) < 0){
console.log( 'unexpected answer type: ' + msg.type);
throw('UNEXPECTED_TYPE');
}
break;
case 'more':
break;
default:
//data should be concatenated
if (poa.data.indexOf(key) >= 0){
if (!this._response.hasOwnProperty(key)){
this._response[key] = '';
}
this._response[key] = this._response[key].concat(msg[key]);
}
//params should not change through the message
else if (poa.params.indexOf(key) >= 0){
if (!this._response.hasOwnProperty(key)){
this._response[key] = msg[key];
}
else if (this._response[key] !== msg[key]){
throw('UNEXPECTED_TYPE');
}
}
//infos may be json objects etc. Not yet defined.
// Pushing them into arrays for now
else if (poa.infos.indexOf(key) >= 0){
if (!this._response.hasOwnProperty(key)){
this._response[key] = [];
}
this._response.push(msg[key]);
}
else {
console.log('unexpected answer parameter: ' + key);
throw('UNEXPECTED_PARAM');
}
break;
}
}
}
/**
* Returns the assembled message. TODO: does not care yet if completed.
*/
get message(){
return this._response;
}
}
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