/** @type {import('./nginx.d.ts')} */

/** @param {NginxHTTPRequest} request */
async function validate(request) {
    if (request.status !== 0) return;

    const token = request.variables.cookie___proxy_token;

    if (token == undefined) {
        // missing token
        request.return(401);
        return;
    }

    const cache = ngx.shared.auth_token_cache;
    if (cache === undefined) throw "missing shared js cache";

    const requiredScope = request.variables.required_scope;
    if (requiredScope === undefined) throw "missing required scope variable";

    let scopes = cache.get(token);

    if (scopes === undefined) {
        const subrequest = await request.subrequest(`/.nginx/scopes`, {
            args: `token=${token}`
        });

        if (subrequest.status !== 200) {
            // invalid token
            return request.return(401);
        }

        scopes = subrequest.responseText.split("\n");

        cache.set(token, scopes.join(","));
    } else {
        scopes = scopes.split(",");
    }

    if (scopes.indexOf(requiredScope) === -1) {
        return request.return(403);
    }

    return request.return(200);
}

export default {
    validate,
}