node-ca-session

Module for session handling. This module generates unique token for specified data and stores it in Redis DB. Session data can be validated using validate method. With each validation tokens duration is prolonged for specified TTL.

Supports TTL (Time To Live)

Install

npm install ca-session-service

Usage

initialization

var redis = require('redis');
var CaSession = require('ca-session-service');

var sessionService = CaSession.init({
    redis_client: new redis.createClient(PORT,HOST)
});

"ca-session-service" depends on npm package "redis" (v ^2.4.2). Redis isn't hard dependecy so that user can be more flexible in configuring and authenticating with Redis server.

You can override token's Time To Live and bytes lenght

var sessionService = CaSession.init({
    redis_client: new redis.createClient(PORT,HOST),
    token_TTL: 2 * 3600, // TTL in seconds, defaults to 2h
    token_bytes_length: 24 // Tokens bytes lenght, defaults to 24 bytes
});

create session

sessionService.create({user_id: 150, foo: 'bar'}, 
    function(err, session){
        console.log(session);
        //{token: "GENERATED_TOKEN_VALUE", user_id: 150, foo: "bar", createdAt: "2015-10-25 20:14:10"}
    });

validate session

sessionService.validate(TOKEN, 
    function(err, session){
        console.log(session);
        //{user_id: 150, foo: "bar", createdAt: "2015-10-25 20:14:10"}
    });

Promises

All methods support promise and callback pattern

validate session using promise

sessionService.validate(TOKEN)
.then(function(session){
    console.log(session);
    //{user_id: 150, foo: "bar", createdAt: "2015-10-25 20:14:10"}
})
.catch(function(err){
    console.log(err);
});

Secondary indexes

ca-session-service supports secondary indexes. If custom index is set, when session is created, extra new key-value pair is created, where key is equal to "{$index_property}:{$index_value}" and value of created token. For example, if you create session with data {user_id: 150} and property user_id is secondary index, after creating session, ca-session-service will for key "user_id:150" add member with value of token. This can be used for keeping track of all active user's token's, and deleting them upon closing account.

sessionService.addIndex('user_id');
sessionService.create({user_id: 150, foo: 'bar'}, 
    function(err, session){
        console.log(session);
        //{token: "SOME_RANDOM_TOKEN", user_id: 150, foo: "bar", createdAt: "2015-10-25 20:14:10"}
        
        // as defined in custom indexes, "user_id:150" key now contains all associated tokens
        redis_client.smembers("user_id:150", function(err, members){
        
            // members contain all tokens
            console.log(members);
            // ["SOME_RANDOM_TOKEN"]
            
            // now you can delete all tokens from redis db associated with user
            members.forEach(function(token){
                redis_client.del(token);
            });
            
        });
        
    });

Test

• Make sure you have redis DB running on default port and host

npm test