markone/packages/server/src/http-handler.ts

import { HttpError } from "./error.ts"

type HttpMethod = "GET" | "POST" | "DELETE" | "PUT" | "OPTIONS" | "PATCH"

const ALLOWED_ORIGINS = ["http://localhost:5173"]

function httpHandler<Route extends string>(
	handler: (request: Bun.BunRequest<Route>) => Promise<Response>,
): (request: Bun.BunRequest<Route>) => Promise<Response> {
	return async (request) => {
		let response: Response
		try {
			response = await handler(request)
		} catch (error) {
			if (error instanceof HttpError) {
				if (error.message || error.code) {
					response = Response.json({ code: error.code, message: error.message }, { status: error.status })
				} else {
					response = new Response(undefined, { status: error.status })
				}
			} else {
				console.error(error)
				response = new Response(undefined, { status: 500 })
			}
		}
		for (const origin of ALLOWED_ORIGINS) {
			response.headers.set("Access-Control-Allow-Origin", origin)
		}
		response.headers.set("Access-Control-Allow-Credentials", "true")
		return response
	}
}

function preflightHandler<Route extends string>({ allowedMethods }: { allowedMethods: HttpMethod[] }) {
	return async (request: Bun.BunRequest<Route>) =>
		new Response(undefined, {
			status: 200,
			headers: {
				"Access-Control-Allow-Origin": ALLOWED_ORIGINS.join(", "),
				"Access-Control-Allow-Methods": allowedMethods.join(", "),
				"Access-Control-Allow-Credentials": "true",
			},
		})
}

export { httpHandler, preflightHandler }