svelte-session-manager

Session store for svelte (currently only for JWT)

usage

import { derived } from 'svelte';
import { Session, login } from 'svelte-session-manager';

// use localStorage as backing store
let session = new Session(localStorage);

// session may still be valid
if(!session.isValid) {
  await login(session, 'https://mydomain.com/authenticate', 'a user', 'a secret');
}

session.isValid; // true when auth was ok or localStorage token is still valid


export const values = derived(
  session,
  ($session, set) => {
    if (!session.isValid) {
      set([]); // session has expired no more data
    } else {
      fetch('https://mydomain.com/values', {
        headers: {
          ...session.authorizationHeader
        }
      }).then(async data => set(await data.json()));
    }
    return () => {};
  }
,[]);

// $values contains fetch result as long as session has not expired

run tests

export BROWSER=safari|chrome|...
npm|yarn test

The test runs the following requests against the server

• successful auth

curl -X POST -d '{"username":"user","password":"secret"}' 'http://[::]:5000/api/login'

{"access_token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbnRpdGxlbWVudHMiOiJhLGIsYyIsImlhdCI6MTYwNDY2NDI0NywiZXhwIjoxNjA0NjY0MjYyfQ.qyjeoCuXO0iyYwSxM2sM02_BVhaZobRmEWam1M8Hzkx51nbsAuTR8G1rNgz1COo_KvbCU7LwZt7qnSEFB1tcwyDA1eBxwc2Wb7JxWgQ50m1IWkr2JCgY1seWRJRcwZBXiTRtiPqhzofP-l3S-CBluzU48cd4yzoPayczLkKuPK4"}

• invalid credentials

curl -X POST -d '{"username":"user","password":"wrong"}' 'http://[::]:5000/api/login'

{"message":"Unauthorized"}

Live Example

live example

API

Table of Contents

• login
  • Parameters
• handleFailedResponse
  • Parameters
• SessionData
  • Properties
• msecsRequiredForRefresh
• Session
  • Parameters
  • Properties
  • update
    • Parameters
  • refresh
  • authorizationHeader
  • isValid
  • invalidate
  • hasEntitlement
    • Parameters
  • subscribe
    • Parameters
• decode
  • Parameters

login

Bring session into the valid state by calling the authorization endpoint and asking for a access_token. Executes a POST on the endpoint url expecting username, and password as json

Parameters

• session Session to be opened
• endpoint string authorization url
• username string id of the user
• password string user credentials
• tokenmap Object token names in response to internal known values (optional, default defaultTokenMap)

Returns Promise<(string | undefined)> error message in case of failure or undefined on success

handleFailedResponse

Extract error description from response.

Parameters

• response Response

Returns Promise<string>

SessionData

Data as preserved in the backing store.

Type: Object

Properties

• username string user name (id)
• access_token string JWT token
• refresh_token string JWT token

msecsRequiredForRefresh

Time required to execute a refresh

Type: number

Session

User session. To create as session backed by browser local storage.

let session = new Session(localStorage);

or by browser session storage

let session = new Session(sessionStorage);

Parameters

• store SessionData (optional, default localStorage)

Properties

• entitlements Set<string>
• subscriptions Set<Object> store subscriptions
• expirationDate Date when the access token expires
• access_token string token itself
• refresh_token string refresh token

update

Consume auth response data and reflect internal state.

Parameters

• data Object

refresh

Refresh with refresh_token.

Returns Promise<boolean> true if refresh was succcessfull false otherwise

authorizationHeader

Http header suitable for fetch.

Returns Object header The http header.

Returns string header.Authorization The Bearer access token.

isValid

As long as the expirationTimer is running we must be valid.

Returns boolean true if session is valid (not expired)

invalidate

Remove all tokens from the session and the backing store.

hasEntitlement

Check presence of an entitlement.

Parameters

• name string of the entitlement

Returns boolean true if the named entitlement is present

subscribe

Fired when the session changes.

Parameters

• subscription Function

decode

Extract and decode the payload.

Parameters

• token string

Returns Object payload object

install

With npm do:

npm install svelte-session-manager

license

BSD-2-Clause