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mirror of https://github.com/moparisthebest/mail synced 2024-12-23 07:48:48 -05:00

add preliminary implementation for delta sync

This commit is contained in:
Felix Hammerl 2013-11-29 16:13:38 +01:00
parent 4a9b58cfe2
commit 4e4fa0f16f

View File

@ -1,9 +1,9 @@
define(function(require) {
'use strict';
var util = require('cryptoLib/util');
// _ = require('underscore'),
// str = require('js/app-config').string,
var util = require('cryptoLib/util'),
_ = require('underscore'),
str = require('js/app-config').string;
// config = require('js/app-config').config;
var EmailDAO = function(keychain, imapClient, smtpClient, crypto, devicestorage) {
@ -135,6 +135,307 @@ define(function(require) {
});
};
EmailDAO.prototype.sync = function(options, callback) {
/*
* Here's how delta sync works:
* delta1: storage > memory => we deleted messages, remove from remote
* delta2: memory > storage => we added messages, push to remote
* delta3: memory > imap => we deleted messages directly from the remote, remove from memory and storage
* delta4: imap > memory => we have new messages available, fetch to memory and storage
*/
// TODO: error handling
var self = this,
folder,
delta1 /*, delta2 */ , delta3, delta4,
isFolderInitialized;
// validate options
if (!options.folder) {
callback({
errMsg: 'Invalid options!'
});
return;
}
folder = _.findWhere(self._account.folders, {
path: options.path
});
isFolderInitialized = !! folder.messages;
// initial filling from local storage is an exception from the normal sync
if (!isFolderInitialized) {
folder.messages = [];
self._localListMessages({
folder: folder.path
}, function(err, messages) {
if (err) {
callback(err);
return;
}
if (_.isEmpty(messages)) {
// if there's nothing here, we're good
callback();
return;
}
var after = _.after(messages.length, function() {
callback();
});
messages.forEach(function(message) {
handleMessage(message, function(cleartextMessage) {
folder.messages.push(cleartextMessage);
after();
});
});
});
return;
}
doLocalDelta();
function doLocalDelta() {
self._localListMessages({
folder: folder.path
}, function(err, messages) {
/*
* Reminder:
* delta1: storage > memory => we deleted messages, remove from remote
* delta2: memory > storage => we added messages, push to remote
*/
delta1 = checkDelta(messages, folder.messages);
// delta2 = checkDelta(folder.messages, messages); // not supported yet
if (_.isEmpty(delta1) /* && _.isEmpty(delta2)*/ ) {
// if there is no delta, head directly to imap sync
doImapDelta();
callback();
return;
}
var after = _.after(delta1.length, function() {
doImapDelta();
callback();
});
delta1.forEach(function(message) {
var deleteMe = {
folder: folder.path,
uid: message.uid
};
self._imapDeleteMessage(deleteMe, function() {
self._localDeleteMessage(deleteMe, function() {
after();
});
});
});
});
}
function doImapDelta() {
self._imapListMessages({
folder: folder.path
}, function(err, headers) {
if (err) {
callback(err);
return;
}
/*
* Reminder:
* delta3: memory > imap => we deleted messages directly from the remote, remove from memory and storage
* delta4: imap > memory => we have new messages available, fetch to memory and storage
*/
delta3 = checkDelta(folder.messages, headers);
delta4 = checkDelta(headers, folder.messages);
if (_.isEmpty(delta3) && _.isEmpty(delta4)) {
// if there is no delta, we're done
callback();
return;
}
doDelta3();
function doDelta3() {
if (_.isEmpty(delta3)) {
doDelta4();
return;
}
var after = _.after(delta1.length, function() {
doDelta4();
});
delta3.forEach(function(header) {
// remove delta3 from memory
var idx = folder.messages.indexOf(header);
folder.messages.splice(idx, 1);
// remove delta3 from local storage
self._localDeleteMessage({
folder: folder.path,
uid: header.uid
}, function(err) {
if (err) {
callback(err);
return;
}
after();
});
});
}
function doDelta4() {
if (_.isEmpty(delta4)) {
callback();
}
var after = _.after(delta1.length, function() {
callback();
});
delta4.forEach(function(header) {
self._imapGetMessage({
folder: folder.path,
uid: header.uid
}, function(err, message) {
if (err) {
callback(err);
return;
}
self._localStoreMessages({
folder: folder.path,
emails: [message]
}, function(err) {
if (err) {
callback(err);
return;
}
handleMessage(message, function(err, cleartextMessage) {
if (err) {
callback(err);
return;
}
folder.messages.push(cleartextMessage);
after();
});
});
});
});
}
});
}
/*
* Checks which messages are included in a, but not in b
*/
function checkDelta(a, b) {
var i, msg, exists,
delta = [];
// find the delta
for (i = a.length - 1; i >= 0; i--) {
msg = a[i];
exists = !! _.findWhere(b, {
uid: msg.uid,
subject: msg.subject
});
if (!exists) {
delta.push(msg);
}
}
return delta;
}
function handleMessage(message, localCallback) {
if (containsArmoredCiphertext(message)) {
decrypt(message, localCallback);
return;
}
// cleartext mail
localCallback(null, message);
after();
}
function containsArmoredCiphertext(email) {
return typeof email.body === 'string' && email.body.indexOf(str.cryptPrefix) !== -1 && email.body.indexOf(str.cryptSuffix) !== -1;
}
function decrypt(email, localCallback) {
var sender;
extractArmoredContent(email);
// fetch public key required to verify signatures
sender = email.from[0].address;
self._keychain.getReceiverPublicKey(sender, function(err, senderPubkey) {
if (err) {
localCallback(err);
return;
}
if (!senderPubkey) {
// this should only happen if a mail from another channel is in the inbox
setBodyAndContinue('Public key for sender not found!');
return;
}
// decrypt and verfiy signatures
self._pgp.decrypt(email.body, senderPubkey.publicKey, function(err, decrypted) {
if (err) {
decrypted = err.errMsg;
}
setBodyAndContinue(decrypted);
});
});
function extractArmoredContent(email) {
var start = email.body.indexOf(str.cryptPrefix),
end = email.body.indexOf(str.cryptSuffix) + str.cryptSuffix.length;
// parse email body for encrypted message block
email.body = email.body.substring(start, end);
}
function setBodyAndContinue(text) {
email.body = text;
localCallback(null, email);
}
}
};
//
// Local Storage Apis
//
EmailDAO.prototype._localListMessages = function(options, callback) {
this._devicestorage.listItems('email_' + options.folder, 0, null, callback);
};
EmailDAO.prototype._localStoreMessages = function(options, callback) {
var dbType = 'email_' + options.folder;
self._devicestorage.storeList(options.emails, dbType, callback);
};
EmailDAO.prototype._localDeleteMessage = function(options, callback) {
self._devicestorage.removeList('email_' + options.folder + '_' + options.uid, callback);
};
//
// IMAP Apis
//
@ -158,6 +459,38 @@ define(function(require) {
self._imapClient.logout(callback);
};
/**
* List messages from an imap folder. This will not yet fetch the email body.
* @param {String} options.folderName The name of the imap folder.
*/
EmailDAO.prototype._imapListMessages = function(options, callback) {
var self = this;
self._imapClient.listMessages({
path: options.folder,
offset: 0,
length: 100
}, callback);
};
EmailDAO.prototype._imapDeleteMessage = function(options, callback) {
this._imapClient.deleteMessage({
path: options.folder,
uid: options.uid
}, callback);
};
/**
* Get an email messsage including the email body from imap
* @param {String} options.messageId The
*/
EmailDAO.prototype._imapGetMessage = function(options, callback) {
this._imapClient.getMessagePreview({
path: options.folder,
uid: options.uid
}, callback);
};
/**
* List the folders in the user's IMAP mailbox.
@ -216,6 +549,8 @@ define(function(require) {
}
};
// /**
// * Get the number of unread message for a folder
// */
@ -470,34 +805,7 @@ define(function(require) {
// }
// };
// /**
// * List messages from an imap folder. This will not yet fetch the email body.
// * @param {String} options.folderName The name of the imap folder.
// * @param {Number} options.offset The offset of items to fetch (0 is the last stored item)
// * @param {Number} options.num The number of items to fetch (null means fetch all)
// */
// EmailDAO.prototype.imapListMessages = function(options, callback) {
// var self = this;
// self._imapClient.listMessages({
// path: options.folder,
// offset: options.offset,
// length: options.num
// }, callback);
// };
// /**
// * Get an email messsage including the email body from imap
// * @param {String} options.messageId The
// */
// EmailDAO.prototype.imapGetMessage = function(options, callback) {
// var self = this;
// self._imapClient.getMessagePreview({
// path: options.folder,
// uid: options.uid
// }, callback);
// };
// EmailDAO.prototype.imapMoveMessage = function(options, callback) {
// var self = this;
@ -519,25 +827,6 @@ define(function(require) {
// }
// };
// EmailDAO.prototype.imapDeleteMessage = function(options, callback) {
// var self = this;
// self._imapClient.deleteMessage({
// path: options.folder,
// uid: options.uid
// }, moved);
// function moved(err) {
// if (err) {
// callback(err);
// return;
// }
// // delete from local db
// self._devicestorage.removeList('email_' + options.folder + '_' + options.uid, callback);
// }
// };
// EmailDAO.prototype.imapMarkMessageRead = function(options, callback) {
// var self = this;