mount.ts
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mount.ts
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	import Router from "@koa/router";
	import Koa, { Context } from "koa";
	import { Middlewares } from "sealious";
	import { Mountable } from "./page/mountable";

	async function handleHtmlPromise(ctx: Context, next: Koa.Next) {
	await next();
	if (ctx.body instanceof Promise) {
	// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
	ctx.body = await ctx.body;
	}
	ctx.set("content-type", "text/html;charset=utf-8");
	}

	export function mount(
	router: Router,
	url: string \| { rawURL: string },
	mountable: Mountable
	): void {
	const raw_url = typeof url === "string" ? url : url.rawURL;
	router.use(
	raw_url,
	Middlewares.extractContext(),
	Middlewares.parseBody(),
	handleHtmlPromise
	);
	mountable.init();

	// to automatically add trailing slashes:
	router.get(raw_url.slice(0, -1), async (ctx, next) => {
	const url2 = ctx.URL;
	if (!url2.pathname.endsWith("/")) {
	url2.pathname += "/";
	ctx.redirect(url2.pathname);
	}
	await next();
	});

	router.use(raw_url, async (ctx, next) => {
	ctx.set("content-type", "text/html;charset=utf-8");
	const access_result = await mountable.canAccess(ctx);
	if (!access_result.canAccess) {
	ctx.status = 403;
	ctx.body = access_result.message \|\| "no access";
	return;
	}
	await next();
	});

	mountable.mount(router, raw_url);
	}