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mail/src/js/bo/outbox.js

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define(function(require) {
'use strict';
var _ = require('underscore'),
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util = require('cryptoLib/util'),
config = require('js/app-config').config,
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outboxDb = 'email_OUTBOX';
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/**
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* High level business object that orchestrates the local outbox.
* The local outbox takes care of the emails before they are being sent.
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* It also checks periodically if there are any mails in the local device storage to be sent.
*/
var OutboxBO = function(emailDao, keychain, devicestorage) {
/** @private */
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this._emailDao = emailDao;
/** @private */
this._keychain = keychain;
/** @private */
this._devicestorage = devicestorage;
/**
* Semaphore-esque flag to avoid 'concurrent' calls to _processOutbox when the timeout fires, but a call is still in process.
* @private */
this._outboxBusy = false;
};
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/**
* This function activates the periodic checking of the local device storage for pending mails.
* @param {Function} callback(error, pendingMailsCount) Callback that informs you about the count of pending mails.
*/
OutboxBO.prototype.startChecking = function(callback) {
// remember global callback
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this._onUpdate = callback;
// start periodic checking of outbox
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this._intervalId = setInterval(this._processOutbox.bind(this, this._onUpdate), config.checkOutboxInterval);
};
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/**
* Outbox stops the periodic checking of the local device storage for pending mails.
*/
OutboxBO.prototype.stopChecking = function() {
if (!this._intervalId) {
return;
}
clearInterval(this._intervalId);
delete this._intervalId;
};
/**
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* Put a email dto in the outbox for sending when ready
* @param {Object} mail The Email DTO
* @param {Function} callback Invoked when the object was encrypted and persisted to disk
*/
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OutboxBO.prototype.put = function(mail, callback) {
var self = this,
allReaders = mail.from.concat(mail.to.concat(mail.cc.concat(mail.bcc))); // all the users that should be able to read the mail
mail.publicKeysArmored = []; // gather the public keys
mail.uid = mail.id = util.UUID(); // the mail needs a random id & uid for storage in the database
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// do not encrypt mails with a bcc recipient, due to a possible privacy leak
if (mail.bcc.length > 0) {
storeAndForward(mail);
return;
}
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checkRecipients(allReaders);
// check if there are unregistered recipients
function checkRecipients(recipients) {
var after = _.after(recipients.length, function() {
checkEncrypt();
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});
// find out if there are unregistered users
recipients.forEach(function(recipient) {
self._keychain.getReceiverPublicKey(recipient.address, function(err, key) {
if (err) {
callback(err);
return;
}
// if a public key is available, add the recipient's key to the armored public keys,
// otherwise remember the recipient as unregistered for later sending
if (key) {
mail.publicKeysArmored.push(key.publicKey);
}
after();
});
});
}
function checkEncrypt() {
// only encrypt if all recipients have public keys
if (mail.publicKeysArmored.length < allReaders.length) {
storeAndForward(mail);
return;
}
// encrypts the body and attachments and persists the mail object
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self._emailDao.encrypt({
mail: mail,
publicKeysArmored: mail.publicKeysArmored
}, function(err) {
if (err) {
callback(err);
return;
}
storeAndForward(mail);
});
}
function storeAndForward(mail) {
// store in outbox
self._devicestorage.storeList([mail], outboxDb, function(err) {
if (err) {
callback(err);
return;
}
callback();
// don't wait for next round
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self._processOutbox(self._onUpdate);
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});
}
};
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/**
* Checks the local device storage for pending mails.
* @param {Function} callback(error, pendingMailsCount) Callback that informs you about the count of pending mails.
*/
OutboxBO.prototype._processOutbox = function(callback) {
var self = this,
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unsentMails = 0;
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// also, if a _processOutbox call is still in progress, ignore it.
if (self._outboxBusy) {
return;
}
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self._outboxBusy = true;
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// get pending mails from the outbox
self._devicestorage.listItems(outboxDb, 0, null, function(err, pendingMails) {
// error, we're done here
if (err) {
self._outboxBusy = false;
callback(err);
return;
}
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// if we're not online, don't even bother sending mails.
if (!self._emailDao._account.online || _.isEmpty(pendingMails)) {
self._outboxBusy = false;
callback(null, pendingMails.length);
return;
}
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// we're done after all the mails have been handled
// update the outbox count...
var after = _.after(pendingMails.length, function() {
self._outboxBusy = false;
callback(null, unsentMails);
});
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// send pending mails if possible
pendingMails.forEach(function(mail) {
send(mail, after);
});
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});
// send the message
function send(mail, done) {
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// check is email is to be sent encrypted or as plaintex
if (mail.encrypted === true) {
// email was already encrypted before persisting in outbox, tell pgpmailer to send encrypted and not encrypt again
self._emailDao.sendEncrypted({
email: mail
}, onSend);
} else {
// send email as plaintext
self._emailDao.sendPlaintext({
email: mail
}, onSend);
}
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function onSend(err) {
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if (err) {
self._outboxBusy = false;
if (err.code === 42) {
// offline try again later
done();
} else {
self._outboxBusy = false;
callback(err);
}
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return;
}
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// remove the pending mail from the storage
removeFromStorage(mail, done);
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// fire sent notification
if (typeof self.onSent === 'function') {
self.onSent(mail);
}
}
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}
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// removes the mail object from disk after successfully sending it
function removeFromStorage(mail, done) {
self._devicestorage.removeList(outboxDb + '_' + mail.uid, function(err) {
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if (err) {
self._outboxBusy = false;
callback(err);
return;
}
done();
});
}
};
return OutboxBO;
});