mirror of https://github.com/moparisthebest/mail
574 lines
17 KiB
JavaScript
574 lines
17 KiB
JavaScript
define(function(require) {
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'use strict';
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var _ = require('underscore'),
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util = require('cryptoLib/util'),
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str = require('js/app-config').string;
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/**
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* A high-level Data-Access Api for handling Email synchronization
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* between the cloud service and the device's local storage
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*/
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var EmailDAO = function(keychain, imapClient, smtpClient, crypto, devicestorage) {
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var self = this;
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self._keychain = keychain;
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self._imapClient = imapClient;
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self._smtpClient = smtpClient;
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self._crypto = crypto;
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self._devicestorage = devicestorage;
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};
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/**
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* Inits all dependencies
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*/
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EmailDAO.prototype.init = function(account, passphrase, callback) {
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var self = this;
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self._account = account;
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// validate email address
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var emailAddress = self._account.emailAddress;
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if (!util.validateEmailAddress(emailAddress)) {
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callback({
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errMsg: 'The user email address must be specified!'
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});
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return;
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}
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// init keychain and then crypto module
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initKeychain();
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function initKeychain() {
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// init user's local database
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self._devicestorage.init(emailAddress, function() {
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// call getUserKeyPair to read/sync keypair with devicestorage/cloud
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self._keychain.getUserKeyPair(emailAddress, function(err, storedKeypair) {
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if (err) {
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callback(err);
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return;
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}
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// init crypto
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initCrypto(storedKeypair);
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});
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});
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}
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function initCrypto(storedKeypair) {
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if (storedKeypair && storedKeypair.privateKey && storedKeypair.publicKey) {
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// import existing key pair into crypto module
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self._crypto.importKeys({
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passphrase: passphrase,
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privateKeyArmored: storedKeypair.privateKey.encryptedKey,
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publicKeyArmored: storedKeypair.publicKey.publicKey
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}, callback);
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return;
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}
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// no keypair for is stored for the user... generate a new one
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self._crypto.generateKeys({
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emailAddress: self._account.emailAddress,
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keySize: self._account.asymKeySize,
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passphrase: passphrase
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}, function(err, generatedKeypair) {
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if (err) {
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callback(err);
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return;
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}
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// import the new key pair into crypto module
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self._crypto.importKeys({
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passphrase: passphrase,
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privateKeyArmored: generatedKeypair.privateKeyArmored,
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publicKeyArmored: generatedKeypair.publicKeyArmored
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}, function(err) {
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if (err) {
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callback(err);
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return;
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}
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// persist newly generated keypair
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var newKeypair = {
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publicKey: {
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_id: generatedKeypair.keyId,
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userId: self._account.emailAddress,
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publicKey: generatedKeypair.publicKeyArmored
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},
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privateKey: {
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_id: generatedKeypair.keyId,
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userId: self._account.emailAddress,
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encryptedKey: generatedKeypair.privateKeyArmored
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}
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};
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self._keychain.putUserKeyPair(newKeypair, callback);
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});
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});
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}
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};
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//
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// IMAP Apis
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//
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/**
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* Login the imap client
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*/
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EmailDAO.prototype.imapLogin = function(callback) {
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var self = this;
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// login IMAP client if existent
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self._imapClient.login(callback);
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};
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/**
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* Cleanup by logging the user off.
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*/
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EmailDAO.prototype.destroy = function(callback) {
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var self = this;
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self._imapClient.logout(callback);
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};
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/**
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* List the folders in the user's IMAP mailbox.
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*/
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EmailDAO.prototype.imapListFolders = function(callback) {
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var self = this,
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dbType = 'folders';
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// check local cache
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self._devicestorage.listItems(dbType, 0, null, function(err, stored) {
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if (err) {
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callback(err);
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return;
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}
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if (!stored || stored.length < 1) {
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// no folders cached... fetch from server
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fetchFromServer();
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return;
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}
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callback(null, stored[0]);
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});
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function fetchFromServer() {
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var folders;
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// fetch list from imap server
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self._imapClient.listWellKnownFolders(function(err, wellKnownFolders) {
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if (err) {
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callback(err);
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return;
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}
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folders = [
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wellKnownFolders.inbox,
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wellKnownFolders.sent, {
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type: 'Outbox',
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path: 'OUTBOX'
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},
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wellKnownFolders.drafts,
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wellKnownFolders.trash
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];
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// cache locally
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// persist encrypted list in device storage
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self._devicestorage.storeList([folders], dbType, function(err) {
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if (err) {
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callback(err);
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return;
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}
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callback(null, folders);
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});
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});
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}
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};
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/**
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* Get the number of unread message for a folder
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*/
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EmailDAO.prototype.unreadMessages = function(path, callback) {
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var self = this;
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self._imapClient.unreadMessages(path, callback);
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};
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/**
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* Fetch a list of emails from the device's local storage
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*/
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EmailDAO.prototype.listMessages = function(options, callback) {
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var self = this,
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encryptedList = [];
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// validate options
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if (!options.folder) {
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callback({
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errMsg: 'Invalid options!'
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});
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return;
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}
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options.offset = (typeof options.offset === 'undefined') ? 0 : options.offset;
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options.num = (typeof options.num === 'undefined') ? null : options.num;
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// fetch items from device storage
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self._devicestorage.listItems('email_' + options.folder, options.offset, options.num, function(err, emails) {
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if (err) {
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callback(err);
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return;
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}
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// find encrypted items
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emails.forEach(function(i) {
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if (typeof i.body === 'string' && i.body.indexOf(str.cryptPrefix) !== -1 && i.body.indexOf(str.cryptSuffix) !== -1) {
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// parse ct object from ascii armored message block
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encryptedList.push(parseMessageBlock(i));
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}
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});
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if (encryptedList.length === 0) {
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callback(null, []);
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return;
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}
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// decrypt items
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decryptList(encryptedList, callback);
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});
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function parseMessageBlock(email) {
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var messageBlock;
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// parse email body for encrypted message block
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try {
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// get ascii armored message block by prefix and suffix
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messageBlock = email.body.split(str.cryptPrefix)[1].split(str.cryptSuffix)[0];
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// add prefix and suffix again
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email.body = str.cryptPrefix + messageBlock + str.cryptSuffix;
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} catch (e) {
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callback({
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errMsg: 'Error parsing encrypted message block!'
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});
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return;
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}
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return email;
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}
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function decryptList(list, callback) {
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var after = _.after(list.length, function() {
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callback(null, list);
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});
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list.forEach(function(i) {
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// gather public keys required to verify signatures
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var sender = i.from[0].address;
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self._keychain.getReveiverPublicKey(sender, function(err, senderPubkey) {
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// decrypt and verfiy signatures
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self._crypto.decrypt(i.body, senderPubkey.publicKey, function(err, decrypted) {
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if (err) {
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callback(err);
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return;
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}
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decrypted = JSON.parse(decrypted);
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i.subject = decrypted.subject;
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i.body = decrypted.body;
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after();
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});
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});
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});
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}
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};
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/**
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* High level sync operation for the delta from the user's IMAP inbox
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*/
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EmailDAO.prototype.imapSync = function(options, callback) {
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var self = this,
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dbType = 'email_' + options.folder;
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fetchList(function(err, emails) {
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if (err) {
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callback(err);
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return;
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}
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// delete old items from db
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self._devicestorage.removeList(dbType, function(err) {
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if (err) {
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callback(err);
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return;
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}
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// persist encrypted list in device storage
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self._devicestorage.storeList(emails, dbType, callback);
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});
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});
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function fetchList(callback) {
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var encryptedList = [];
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// fetch imap folder's message list
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self.imapListMessages({
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folder: options.folder,
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offset: options.offset,
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num: options.num
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}, function(err, emails) {
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if (err) {
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callback(err);
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return;
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}
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// find encrypted messages by subject
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emails.forEach(function(i) {
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if (i.subject === str.subject) {
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encryptedList.push(i);
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}
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});
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// fetch message bodies
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fetchBodies(encryptedList, callback);
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});
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}
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function fetchBodies(messageList, callback) {
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var emails = [];
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if (messageList.length < 1) {
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callback(null, emails);
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return;
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}
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var after = _.after(messageList.length, function() {
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callback(null, emails);
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});
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_.each(messageList, function(messageItem) {
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self.imapGetMessage({
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folder: options.folder,
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uid: messageItem.uid
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}, function(err, message) {
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if (err) {
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callback(err);
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return;
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}
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// set gotten attributes like body to message object containing list meta data like 'unread' or 'replied'
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messageItem.id = message.id;
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messageItem.body = message.body;
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messageItem.html = message.html;
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messageItem.attachments = message.attachments;
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emails.push(messageItem);
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after();
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});
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});
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}
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};
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/**
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* List messages from an imap folder. This will not yet fetch the email body.
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* @param {String} options.folderName The name of the imap folder.
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* @param {Number} options.offset The offset of items to fetch (0 is the last stored item)
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* @param {Number} options.num The number of items to fetch (null means fetch all)
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*/
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EmailDAO.prototype.imapListMessages = function(options, callback) {
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var self = this;
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self._imapClient.listMessages({
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path: options.folder,
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offset: options.offset,
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length: options.num
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}, callback);
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};
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/**
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* Get an email messsage including the email body from imap
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* @param {String} options.messageId The
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*/
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EmailDAO.prototype.imapGetMessage = function(options, callback) {
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var self = this;
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self._imapClient.getMessagePreview({
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path: options.folder,
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uid: options.uid
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}, callback);
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};
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EmailDAO.prototype.imapMoveMessage = function(options, callback) {
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var self = this;
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self._imapClient.moveMessage({
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path: options.folder,
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uid: options.uid,
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destination: options.destination
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}, moved);
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function moved(err) {
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if (err) {
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callback(err);
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return;
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}
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// delete from local db
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self._devicestorage.removeList('email_' + options.folder + '_' + options.uid, callback);
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}
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};
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EmailDAO.prototype.imapDeleteMessage = function(options, callback) {
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var self = this;
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self._imapClient.deleteMessage({
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path: options.folder,
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uid: options.uid
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}, moved);
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function moved(err) {
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if (err) {
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callback(err);
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return;
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}
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// delete from local db
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self._devicestorage.removeList('email_' + options.folder + '_' + options.uid, callback);
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}
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};
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EmailDAO.prototype.imapMarkMessageRead = function(options, callback) {
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var self = this;
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self._imapClient.updateFlags({
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path: options.folder,
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uid: options.uid,
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unread: false
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}, callback);
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};
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//
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// SMTP Apis
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//
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/**
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* Send an email client side via STMP.
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*/
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EmailDAO.prototype.smtpSend = function(email, callback) {
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var self = this,
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invalidRecipient;
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// validate the email input
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if (!email.to || !email.from || !email.to[0].address || !email.from[0].address) {
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callback({
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errMsg: 'Invalid email object!'
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});
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return;
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}
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// validate email addresses
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_.each(email.to, function(i) {
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if (!util.validateEmailAddress(i.address)) {
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invalidRecipient = i.address;
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}
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});
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if (invalidRecipient) {
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callback({
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errMsg: 'Invalid recipient: ' + invalidRecipient
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});
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return;
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}
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if (!util.validateEmailAddress(email.from[0].address)) {
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callback({
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errMsg: 'Invalid sender: ' + email.from
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});
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return;
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}
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// only support single recipient for e-2-e encryption
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// check if receiver has a public key
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self._keychain.getReveiverPublicKey(email.to[0].address, function(err, receiverPubkey) {
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if (err) {
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callback(err);
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return;
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}
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// validate public key
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if (!receiverPubkey) {
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callback({
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errMsg: 'User has no public key yet!'
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});
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// user hasn't registered a public key yet... invite
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//self.encryptForNewUser(email, callback);
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return;
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}
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// public key found... encrypt and send
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self.encryptForUser(email, receiverPubkey.publicKey, callback);
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});
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};
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/**
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* Encrypt an email asymmetrically for an exisiting user with their public key
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*/
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EmailDAO.prototype.encryptForUser = function(email, receiverPubkey, callback) {
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var self = this,
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pt = JSON.stringify(email),
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receiverPubkeys = [receiverPubkey];
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// get own public key so send message can be read
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self._crypto.exportKeys(function(err, ownKeys) {
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if (err) {
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callback(err);
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return;
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}
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// add own public key to receiver list
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receiverPubkeys.push(ownKeys.publicKeyArmored);
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// encrypt the email
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self._crypto.encrypt(pt, receiverPubkeys, function(err, ct) {
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if (err) {
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callback(err);
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return;
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}
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// bundle encrypted email together for sending
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frameEncryptedMessage(email, ct);
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self.send(email, callback);
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});
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});
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};
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/**
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* Frames an encrypted message in base64 Format.
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*/
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function frameEncryptedMessage(email, ct) {
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var to, greeting;
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var MESSAGE = str.message + '\n\n\n',
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SIGNATURE = '\n\n\n' + str.signature + '\n' + str.webSite + '\n\n';
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// get first name of recipient
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to = (email.to[0].name || email.to[0].address).split('@')[0].split('.')[0].split(' ')[0];
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greeting = 'Hi ' + to + ',\n\n';
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// build encrypted text body
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email.body = greeting + MESSAGE + ct + SIGNATURE;
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email.subject = str.subject;
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return email;
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}
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/**
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* Send an actual message object via smtp
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*/
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EmailDAO.prototype.send = function(email, callback) {
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var self = this;
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self._smtpClient.send(email, callback);
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};
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return EmailDAO;
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}); |