extract-context.ts
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extract-context.ts
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	import { Middleware } from "@koa/router";
	import App from "../app/app";
	import Context from "../context";

	export default function extract_context(): Middleware {
	return async function (ctx, next) {
	const config = ctx.$app.ConfigManager.get("www-server");
	const cookie_name = config["session-cookie-name"];
	let session_id: string \| undefined = ctx.cookies.get(cookie_name);
	const timestamp = Date.now();

	if (!session_id) {
	ctx.$context = new Context(ctx.$app, timestamp, null, null);
	} else {
	const sessions = await ctx.$app.collections.sessions
	.suList()
	.filter({ "session-id": session_id })
	.fetch();

	let user_id;
	if (sessions.empty) {
	session_id = undefined;
	} else {
	user_id = sessions.items[0].get("user") as string;
	}
	ctx.$app.Logger.debug(
	"EXTRACT CONTEXT",
	"User for this request is",
	user_id
	);
	ctx.$context = new Context(
	ctx.$app,
	timestamp,
	user_id,
	session_id
	);
	}
	await next();
	};
	}

	module.exports = extract_context;