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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | 4x 4x 2x 2x 2x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 4x | "use strict";
const Store = require('express-session/session/store');
const defer = require('../helper/defer');
/**
* Drop in replacement for express session store that saves session data in
* a collection.
*/
class CollectionSessionStore extends Store
{
/**
* @param {CachedCollection} collection collection wrapped
* @param {object} options see fields
*/
constructor(collection, options = {})
{
super();
/**
* collection wrapped
*/
this.collection = collection;
/**
* Session dueation
*/
this.sessionsTTL = options.sessionsTTL || 8 * 60 * 60 * 1000;
}
/**
* clean up expired sessions
* @protected
*/
cleanup()
{
const collection = this.collection;
const sessions = collection.lookup;
for (let sessionId in sessions)
{
let session = sessions[sessionId];
if (session)
{
if (session.expires < Date.now())
{
collection.deleteRecord(session);
}
}
}
}
/**
* @override
*/
async get(sessionId, callback)
{
try
{
callback(null, await this.collection.readRecord({
id: sessionId
}))
}
catch (e)
{
callback(null, undefined)
}
}
/**
* @override
*/
set(sessionId, session, callback)
{
this.cleanup();
session = JSON.parse(JSON.stringify(session));
session.id = sessionId;
// let's not send an update to database every time the user makes a request
const THRESHOLD = this.sessionsTTL / 10;
session.expires = Math.ceil((Date.now() + this.sessionsTTL) / THRESHOLD) * THRESHOLD;
Iif (this.collection.lookup[sessionId] && JSON.stringify(this.collection.lookup[sessionId]) !== JSON.stringify(session))
{
this.collection.updateRecord(session);
}
else Eif (!this.collection.lookup[sessionId])
{
this.collection.createRecord(session);
}
defer(callback);
}
/**
* @override
*/
destroy(sessionId, callback)
{
let session = this.collection.lookup[sessionId];
Eif (session)
{
this.collection.deleteRecord(session);
}
defer(callback);
}
}
module.exports = CollectionSessionStore;
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