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https://github.com/Octo8080X/fresh-session

Dead simple cookie-based session for Deno Fresh.
https://github.com/Octo8080X/fresh-session

authentication cookie deno fresh session typescript

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Dead simple cookie-based session for Deno Fresh.

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README 

        
# Fresh Session 🍋



Dead simple cookie-based session for [Deno Fresh](https://fresh.deno.dev).



## Get started



Fresh Session comes with a simple middleware to add at the root of your project,

which will create or resolve a session from the request cookie.



### Install / Import



You can import Fresh Session like so:



```ts

import {

  cookieSession,

  CookieSessionStorage,

  createCookieSessionStorage,

  Session,

  WithSession,

} from "https://deno.land/x/[email protected]/mod.ts";

```



### Setup secret key



Fresh Session currently uses

[iron-webcrypto](https://github.com/brc-dd/iron-webcrypto) encrypted cookie

contents.



iron-webcrypto requires a secret key to encrypt the session payload. Fresh

Session uses the secret key from your

[environment variable](https://deno.land/std/dotenv/load.ts) `APP_KEY`.



If you don't know how to setup environment variable locally, I wrote

[an article about .env file in Deno Fresh](https://xstevenyung.com/blog/read-.env-file-in-deno-fresh).



### Create a root middleware (`./routes/_middleware.ts`)



```ts

import { MiddlewareHandlerContext } from "$fresh/server.ts";

import { cookieSession, WithSession } from "fresh-session";



export type State = {} & WithSession;



const session = cookieSession();



function sessionHandler(req: Request, ctx: MiddlewareHandlerContext) {

  return session(req, ctx);

}

export const handler = [sessionHandler];

```



Learn more about

[Fresh route middleware](https://fresh.deno.dev/docs/concepts/middleware).



### Interact with the session in your routes



Now that the middleware is setup, it's going to handle creating/resolving

session based on the request cookie. So all that you need to worry about is

interacting with your session.



```tsx

// ./routes/dashboard.tsx

import { Handlers, PageProps } from "$fresh/server.ts";

import { WithSession } from "https://deno.land/x/[email protected]/mod.ts";



export type Data = { session: Record };



export const handler: Handlers<

  Data,

  WithSession // indicate with Typescript that the session is in the `ctx.state`

> = {

  GET(_req, ctx) {

    // The session is accessible via the `ctx.state`

    const { session } = ctx.state;



    // Access data stored in the session

    session.get("email");

    // Set new value in the session

    session.set("email", "[email protected]");

    // returns `true` if the session has a value with a specific key, else `false`

    session.has("email");

    // clear all the session data

    session.clear();

    // Access all session data value as an object

    session.data;

    // Add flash data which will disappear after accessing it

    session.flash("success", "Successfully flashed a message!");

    // Accessing the flashed data

    // /!\ This flashed data will disappear after accessing it one time.

    session.flash("success");

    // Session Key Rotation only kv store and redis store.

    // Is not work in cookie store.



    // Rotate the session key. Only supported by the kv store and redis store, not the cookie store.

    // If using the session for authentication, with a kv or redis store, it is recommended to rotate the key at login to prevent session fixation attack.

    // The cookie store is immune from this issue.

    session.keyRotate();



    return ctx.render({

      session: session.data, // You can pass the whole session data to the page

    });

  },

};



export default function Dashboard({ data }: PageProps) {

  return 
You are logged in as {data.session.email}
;

}

```



## Usage Cookie Options



session value is cookie. can set the option for cookie.



```ts

import { cookieSession } from "fresh-session";



export const handler = [

  cookieSession({

    maxAge: 30, //Session keep is 30 seconds.

    httpOnly: true,

  }),

];

```



## cookie session based on Redis



In addition to storing session data in cookies, values can be stored in Redis.



```ts

import { redisSession } from "fresh-session/mod.ts";

import { connect } from "redis/mod.ts";



const redis = await connect({

  hostname: "something redis server",

  port: 6379,

});



export const handler = [redisSession(redis)];



// or Customizable cookie options and Redis key prefix



export const handler = [

  redisSession(redis, {

    keyPrefix: "S_",

    maxAge: 10,

  }),

];

```



## FAQ & Troubleshooting Errors



Some common questions and troubleshooting errors.



### "TypeError: Headers are immutable."



If you are receiving this error, you are likely using a Response.redirect, which

makes the headers immutable. A workaround for this is to use the following

instead:



```ts

new Response(null, {

  status: 302,

  headers: {

    Location: "your-url",

  },

});

```



## Credit



Initial work done by [@xstevenyung](https://github.com/xstevenyung)



Inspiration taken from [Oak Sessions](https://github.com/jcs224/oak_sessions) &

thanks to [@jcs224](https://github.com/jcs224) for all the insight!