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| 'use strict';
const Promise = require('bluebird');
const MongoClient = require('mongodb');
function defaultSerializeFunction(session) {
// Copy each property of the session to a new object
const obj = {};
let prop;
for (prop in session) {
if (prop === 'cookie') {
// Convert the cookie instance to an object, if possible
// This gets rid of the duplicate object under session.cookie.data property
obj.cookie = session.cookie.toJSON ? session.cookie.toJSON() : session.cookie;
} else {
obj[prop] = session[prop];
}
}
return obj;
}
function computeTransformFunctions(options, defaultStringify) {
if (options.serialize || options.unserialize) {
return {
serialize: options.serialize || defaultSerializeFunction,
unserialize: options.unserialize || (x => x),
};
}
if (options.stringify === false || defaultStringify === false) {
return {
serialize: defaultSerializeFunction,
unserialize: x => x,
};
}
Eif (options.stringify === true || defaultStringify === true) {
return {
serialize: JSON.stringify,
unserialize: JSON.parse,
};
}
}
module.exports = function connectMongo(connect) {
const Store = connect.Store || connect.session.Store;
const MemoryStore = connect.MemoryStore || connect.session.MemoryStore;
class MongoStore extends Store {
constructor(options) {
options = options || {};
/* Fallback */
Iif (options.fallbackMemory && MemoryStore) {
return new MemoryStore();
}
super(options);
/* Options */
this.ttl = options.ttl || 1209600; // 14 days
this.collectionName = options.collection || 'sessions';
this.autoRemove = options.autoRemove || 'native';
this.autoRemoveInterval = options.autoRemoveInterval || 10;
this.transformFunctions = computeTransformFunctions(options, true);
this.options = options;
this.changeState('init');
const newConnectionCallback = (err, db) => {
if (err) {
this.connectionFailed(err);
} else {
this.handleNewConnectionAsync(db);
}
};
if (options.url) {
// New native connection using url + mongoOptions
MongoClient.connect(options.url, options.mongoOptions || {}, newConnectionCallback);
} else if (options.mongooseConnection) {
// Re-use existing or upcoming mongoose connection
Iif (options.mongooseConnection.readyState === 1) {
this.handleNewConnectionAsync(options.mongooseConnection.db);
} else {
options.mongooseConnection.once('open', () => this.handleNewConnectionAsync(options.mongooseConnection.db));
}
} else if (options.db && options.db.listCollections) {
// Re-use existing or upcoming native connection
Eif (options.db.openCalled || options.db.openCalled === undefined) { // openCalled is undefined in mongodb@2.x
this.handleNewConnectionAsync(options.db);
} else {
options.db.open(newConnectionCallback);
}
} else {
throw new Error('Connection strategy not found');
}
this.changeState('connecting');
}
connectionFailed(err) {
this.changeState('disconnected');
throw err;
}
handleNewConnectionAsync(db) {
this.db = db;
return this
.setCollection(db.collection(this.collectionName))
.setAutoRemoveAsync()
.then(() => this.changeState('connected'));
}
setAutoRemoveAsync() {
switch (this.autoRemove) {
case 'native':
return this.collection.ensureIndexAsync({ expires: 1 }, { expireAfterSeconds: 0 });
case 'interval':
let removeQuery = { expires: { $lt: new Date() } };
this.timer = setInterval(() => this.collection.remove(removeQuery, { w: 0 }), this.autoRemoveInterval * 1000 * 60);
this.timer.unref();
return Promise.resolve();
default:
return Promise.resolve();
}
}
changeState(newState) {
Eif (newState !== this.state) {
this.state = newState;
this.emit(newState);
}
}
setCollection(collection) {
Iif (this.timer) {
clearInterval(this.timer);
}
this.collectionReadyPromise = undefined;
this.collection = collection;
// Promisify used collection methods
['count', 'findOne', 'remove', 'drop', 'update', 'ensureIndex'].forEach(method => {
collection[method + 'Async'] = Promise.promisify(collection[method], collection);
});
return this;
}
collectionReady() {
if (!this.collectionReadyPromise) {
this.collectionReadyPromise = new Promise((resolve, reject) => {
switch (this.state) {
case 'connected':
resolve(this.collection);
break;
case 'connecting':
this.once('connected', () => resolve(this.collection));
break;
case 'disconnected':
reject(new Error('Not connected'));
break;
}
}).bind(this);
}
return this.collectionReadyPromise;
}
computeStorageId(sessionId) {
Iif (this.options.transformId && typeof this.options.transformId === 'function') {
return this.options.transformId(sessionId);
} else {
return sessionId;
}
}
/* Public API */
get(sid, callback) {
return this.collectionReady()
.then(collection => collection.findOneAsync({
_id: this.computeStorageId(sid),
$or: [
{ expires: { $exists: false } },
{ expires: { $gt: new Date() } },
],
}))
.then(session => {
Eif (session) {
var s = this.transformFunctions.unserialize(session.session);
Iif(this.options.touchAfter > 0 && session.lastModified){
s.lastModified = session.lastModified;
}
this.emit('touch', sid);
return s;
}
})
.nodeify(callback);
}
set(sid, session, callback) {
// removing the lastModified prop from the session object before update
Iif(this.options.touchAfter > 0 && session && session.lastModified){
delete session.lastModified;
}
var s;
try {
s = { _id: this.computeStorageId(sid), session: this.transformFunctions.serialize(session)};
} catch (err) {
return callback(err);
}
if (session && session.cookie && session.cookie.expires) {
s.expires = new Date(session.cookie.expires);
} else {
// If there's no expiration date specified, it is
// browser-session cookie or there is no cookie at all,
// as per the connect docs.
//
// So we set the expiration to two-weeks from now
// - as is common practice in the industry (e.g Django) -
// or the default specified in the options.
s.expires = new Date(Date.now() + this.ttl * 1000);
}
if(this.options.touchAfter > 0){
s.lastModified = new Date();
}
return this.collectionReady()
.then(collection => collection.updateAsync({ _id: this.computeStorageId(sid) }, s, { upsert: true }))
.then(() => this.emit('set', sid))
.nodeify(callback);
}
touch(sid, session, callback) {
var updateFields = {},
touchAfter = this.options.touchAfter * 1000,
lastModified = session.lastModified ? session.lastModified.getTime() : 0,
currentDate = new Date();
// if the given options has a touchAfter property, check if the
// current timestamp - lastModified timestamp is bigger than
// the specified, if it's not, don't touch the session
if(touchAfter > 0 && lastModified > 0){
var timeElapsed = currentDate.getTime() - session.lastModified;
if(timeElapsed < touchAfter){
return callback();
} else {
updateFields.lastModified = currentDate;
}
}
Iif (session && session.cookie && session.cookie.expires) {
updateFields.expires = new Date(session.cookie.expires);
} else {
updateFields.expires = new Date(Date.now() + this.ttl * 1000);
}
return this.collectionReady()
.then(collection => collection.updateAsync({ _id: this.computeStorageId(sid) }, { $set: updateFields }))
.then(result => {
Iif (result.nModified === 0) {
throw new Error('Unable to find the session to touch');
} else {
this.emit('touch', sid);
}
})
.nodeify(callback);
}
destroy(sid, callback) {
return this.collectionReady()
.then(collection => collection.removeAsync({ _id: this.computeStorageId(sid) }))
.then(() => this.emit('destroy', sid))
.nodeify(callback);
}
length(callback) {
return this.collectionReady()
.then(collection => collection.countAsync({}))
.nodeify(callback);
}
clear(callback) {
return this.collectionReady()
.then(collection => collection.dropAsync())
.nodeify(callback);
}
}
return MongoStore;
};
|