// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library 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.
//
// This library 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 library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
/**
* The class that deals with storage of the keyring. Currently the only option is to use HTML5 local storage.
* @requires openpgp
* @module keyring/keyring
*/
var openpgp = require('openpgp');
/**
* Callback to check if a key matches the input
* @callback module:keyring/keyring.checkCallback
* @param {String} input input to search for
* @param {module:key~Key} key The key to be checked.
* @return {Boolean} True if the input matches the specified key
*/
/**
* Initialization routine for the keyring. This method reads the
* keyring from HTML5 local storage and initializes this instance.
* @constructor
* @param {class} [storeHandler] class implementing load() and store() methods
*/
module.exports = function(storeHandler) {
if (!storeHandler) {
storeHandler = new (require('./localstore.js'))();
}
this.storeHandler = storeHandler;
this.keys = this.storeHandler.load();
/**
* Calls the storeHandler to save the keys
*/
this.store = function () {
this.storeHandler.store(this.keys);
};
/**
* Clear the keyring - erase all the keys
*/
this.clear = function() {
this.keys = [];
};
/**
* Checks a key to see if it matches the specified email address
* @param {String} email email address to search for
* @param {module:key~Key} key The key to be checked.
* @return {Boolean} True if the email address is defined in the specified key
*/
function emailCheck(email, key) {
email = email.toLowerCase();
var keyEmails = key.getUserIds();
for (var i; i < keyEmails.length; i++) {
//we need to get just the email from the userid key
keyEmail = keyEmails[i].split('<')[1].split('>')[0].trim().toLowerCase();
if (keyEmail == email) {
return true;
}
}
return false;
}
/**
* Checks a key to see if it matches the specified keyid
* @param {String} id hex string keyid to search for
* @param {module:key~Key} key the key to be checked.
* @return {Boolean} true if the email address is defined in the specified key
* @inner
*/
function idCheck(id, key) {
var keyids = key.getKeyIds();
for (var i = 0; i < keyids.length; i++) {
if (openpgp.util.hexstrdump(keyids[i].write()) == id) {
return true;
}
}
return false;
}
/**
* searches all public keys in the keyring matching the address or address part of the user ids
* @param {Array<module:key~Key>} keys array of keys to search
* @param {module:keyring/keyring.checkCallback} identityFunction callback function which checks for a match
* @param {String} identityInput input to check against
* @param {module:enums.packet} keyType packet types of keys to check
* @return {Array<module:key~Key>} array of keys which match
*/
function checkForIdentityAndKeyTypeMatch(keys, identityFunction, identityInput, keyType) {
var results = [];
for (var p = 0; p < keys.length; p++) {
var key = keys[p];
switch (keyType) {
case openpgp.enums.packet.public_key:
if (key.isPublic() && identityFunction(identityInput, key)) {
results.push(key);
}
break;
case openpgp.enums.packet.private_key:
if (key.isPrivate() && identityFunction(identityInput, key)) {
results.push(key);
}
break;
}
}
return results;
}
/**
* searches all public keys in the keyring matching the address or address part of the user ids
* @param {String} email email address to search for
* @return {Array<module:key~Key>} The public keys associated with provided email address.
*/
this.getPublicKeyForAddress = function (email) {
return checkForIdentityAndKeyTypeMatch(this.keys, emailCheck, email, openpgp.enums.packet.public_key);
};
/**
* Searches the keyring for a private key containing the specified email address
* @param {String} email email address to search for
* @return {Array<module:key~Key>} private keys found
*/
this.getPrivateKeyForAddress = function (email) {
return checkForIdentityAndKeyTypeMatch(this.keys, emailCheck, email, openpgp.enums.packet.secret_key);
};
/**
* Searches the keyring for public keys having the specified key id
* @param {String} keyId provided as string of hex number (lowercase)
* @return {Array<module:key~Key>} public keys found
*/
this.getKeysForKeyId = function (keyId) {
return checkForIdentityAndKeyTypeMatch(this.keys, idCheck, keyId, openpgp.enums.packet.public_key);
};
/**
* Imports a key from an ascii armored message
* @param {String} armored message to read the keys/key from
*/
this.importKey = function (armored) {
this.keys = this.keys.concat(openpgp.key.readArmored(armored).keys);
return true;
};
/**
* returns the armored message representation of the key at key ring index
* @param {Integer} index the index of the key within the array
* @return {String} armored message representing the key object
*/
this.exportKey = function (index) {
return this.keys[index].armor();
};
/**
* Removes a public key from the public key keyring at the specified index
* @param {Integer} index the index of the public key within the publicKeys array
* @return {module:key~Key} The public key object which has been removed
*/
this.removeKey = function (index) {
var removed = this.keys.splice(index, 1);
return removed;
};
/**
* returns the armored message representation of the public key portion of the key at key ring index
* @param {Integer} index the index of the key within the array
* @return {String} armored message representing the public key object
*/
this.exportPublicKey = function (index) {
return this.keys[index].toPublic().armor();
};
};