server/server.js

class Server {
  async getEnv(variables) {
    return Object.fromEntries(
      await Promise.all(
        variables.map(async variable => {
          const {state} = await Deno.permissions.query({
            name: 'env', variable
          })
          if (state === 'granted') {
            return [variable, Deno.env.get(variable)]
          } else {
            return [variable, undefined]
          }
        })
      )
    )
  }

  async configure() {
    const env = await this.getEnv([
      'PORT', 'BASE_URL'
    ])
    this.port = env.PORT ?? 3000
    this.baseUrl = env.BASE_URL ?? '/macchiato'
  }

  async serveRequest(event) {
    const {pathname} = new URL(event.request.url)
    if (pathname === `${this.baseUrl}/api/auth`) {
      event.respondWith(new Response(
        'extract query and redirect', {status: 200}
      ))
    } else {
      event.respondWith(new Response(
        'here', {status: 404}
      ))
    }
  }

  async serveConn(conn) {
    console.log({conn})
    const httpConn = Deno.serveHttp(conn)
    for await (const event of httpConn) {
      this.serveRequest(event)
    }
  }

  async serve() {
    await this.configure()
    this.server = Deno.listen({
      port: this.port,
    })
    for await (const conn of this.server) {
      this.serveConn(conn)
    }
  }
}