Hono Sessions
A session manager for Hono that uses DynamoDB as session storage by default. Supports session retrieval by cookie or access token.
Install
npm install @brightcove/hono-sessions --save
Usage
A middleware is provided that allows configuration of the session options and adds the object sessions
to the Hono context.
import { Hono } from 'hono';
import { DynamoDBDocument } from '@aws-sdk/lib-dynamodb';
import { DynamoDBClient } from '@aws-sdk/client-dynamodb';
import { sessions, DynamoDBAdapter } from '@brightcove/hono-sessions';
const client = new DynamoDBClient({
endpoint: 'http://localhost:4566',
region: 'us-east-1'
});
const document = DynamoDBDocument.from(client);
const app = new Hono();
app.use(sessions({
adapter: new DynamoDBAdapter({
tableName: 'my-table',
primaryKey: 'pk',
sortKey: 'sk',
expiresAttr: 'expires',
document
})
...
}));
app.get('/my_route', async (c, next) => {
const session = c.get('session');
});
Session Storage
DynamoDBAdapter
is provided by default for use with DynamoDB as the storage backend, but alternate backends can be used if they conform to Adapter
export interface Adapter {
get: (key: Record<string, string>) => Promise<{ session: any, cookie?: any, token?: any } | undefined>;
set: (key: Record<string, string>, data: any, cookie?: any, token?: string, expires?: number) => Promise<void>;
delete: (key: Record<string, string>) => Promise<void>;
defaultKeyFn: () => (sessionId: string) => Record<string, string>;
}
Session Retrieval
Cookie
When configured to use cookies the library automatically manages setting/unsetting any any options configured
app.use(sessions({
adapter: new DynamoDBAdapter({
tableName: 'my-table',
primaryKey: 'pk',
sortKey: 'sk',
expiresAttr: 'expires',
document
}),
cookie: {
name: 'session_storage',
maxAge: 60000,
secure: true
}
}));
Access Token
When configured to use tokens, the library looks for a token in the header Authorization: Bearer <token>
or in the query parameter token
.
Note: If both are included, the query parameter takes precedence
app.use(sessions({
adapter: new DynamoDBAdapter({
tableName: 'my-table',
primaryKey: 'pk',
sortKey: 'sk',
expiresAttr: 'expires',
document
}),
token: {
maxAge: 60000,
payload: (session) => ({ user_id: session.user.id })
}
}));
Options
DynamoDBAdapter Options
Middleware Options
Param | Type | Description | Required | Default |
---|
adapter | Adapter | A valid Adapter instance | yes | |
cookie | object | Accepts all the Hono cookie options | yes | |
cookie.name | string | The session cookie name | no | sid.bgs |
secret | string | The secret used for signing cookies | yes, if cookie.secure or token , otherwise no | |
logger | Logger | What will be used for logging errors (ie. logger.error()). console is used by default if not specified | no | console |
token.maxAge | number | The token expiration in seconds from the time it's generated | yes, if using token | |
token.queryParam | Function | Specifies the query param that is checked for the token | no | token |
token.payload | Function | By default tokens only contain the sid and exp in the payload, but this allows additional data to be included with a function with the signature (session) => object . | no | |
allowOverwrite | boolean | Determines whether a new session can be started when the current one hasn't been ended | no | true |
Starting a session
This creates the session item in the database, initialized with a serialized version of any data passed into the function (must be serializable or this will fail) and sets the session cookie on the response.
import { startSession } from '@brightcove/hono-sessions';
app.get('/my_route', async (c, next) => {
await startSession(c, {
user_id: 1234,
name: 'user'
});
...
});
Updating a session
The context exposes both the session
and sessionCookie
, which can freely be edited.
app.get('/my_route', async (c, next) => {
const session = c.get('session');
const cookie = c.get('sessionCookie');
session.newField = 'new value';
...
});
If any of the updated cookie options are invalid, this will fail.
When the request is finalizing, if either has been updated the changes will automatically be synced back to storage.
If any of the cookie options were updated an updated cookie will be set in the response.
Ending a session
This deletes the session from the database and the session cookie in the response if there was one.
import { endSession } from '@brightcove/hono-sessions';
app.get('/my_route', async (c, next) => {
await endSession(c);
...
});
If the library is configured to use token
retrieval, the token
can also be passed in for cases where it isn't found in the normal locations
app.get('/my_route', async (c, next) => {
await endSession(c, token);
...
});
Getting the access token
If the library is configured to use token
retrieval, and there's a valid session, the access token can be found in the context
app.get('/my_route', async (c, next) => {
const token = c.get('sessionToken');
...
});