import { getHashString } from './utils.js'

export async function getAccessToken(subid, timestamp, secretBase) {
    return await getHashString(`${subid}${timestamp}${secretBase}`);
}

export async function verifyAccessToken(request, env, ctx) {
    const headers = request.headers;
    const subid = headers.get('x-subject-id');
	const timestamp = headers.get('x-timestamp');
	const token = headers.get('x-access-token');
    const secretBase = env.ACCESS_TOKEN_BASE;
    return token === await getAccessToken(subid, timestamp, secretBase);
}

export async function getAccessTokenDispatcher(request, env, ctx) {
    const subid = request.headers.get('x-subject-id');
    if (subid === null)
        return new Response(null, { status: 400 });
    
    const timestamp = new Date().toISOString().replace(/:/g, '_');
    const secretBase = env.ACCESS_TOKEN_BASE;
    
    const token = await getAccessToken(subid, timestamp, secretBase);
    const res = JSON.stringify({ token, timestamp });
    return new Response(res, { status: 200 });
}

export default getAccessTokenDispatcher;