daton/lib/src/http/kernel/module/SetSessionCookie.ts

import Module from '../Module.ts'
import Kernel from '../Kernel.ts'
import {Request} from '../../Request.ts'
import PrepareRequest from './PrepareRequest.ts'
import Utility from '../../../service/utility/Utility.ts'
import {Injectable} from '../../../../../di/src/decorator/Injection.ts'
import {Logging} from '../../../service/logging/Logging.ts'

/**
 * HTTP kernel module to set the Daton session cookie, if it doesn't exist.
 * @extends Module
 */
@Injectable()
export default class SetSessionCookie extends Module {

    public static register(kernel: Kernel) {
        kernel.register(this).after(PrepareRequest)
    }

    constructor(
        protected readonly utility: Utility,
    ) {
        super()
    }

    /**
     * If one doesn't exist, generate and set the daton.session cookie.
     * @param {Request} request
     */
    public async apply(request: Request): Promise<Request> {
        if ( !(await request.cookies.has('daton.session')) ) {
            const cookie = `${this.utility.uuid()}-${this.utility.uuid()}`

            this.make(Logging).verbose(`Starting session: ${cookie}`)
            await request.cookies.set('daton.session', cookie)
        }
        return request
    }

}