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import { HttpHandler } from "./router.ts";import * as path from "./vendor/https/deno.land/std/fs/path.ts";import * as media_types from "./vendor/https/deno.land/std/media_types/mod.ts";
export async function resolveFilepath(  dir: string,  pathname: string): Promise<string | undefined> {  let filepath = path.join(dir, pathname);  const fileExists = async (s: string): Promise<boolean> => {    try {      const stat = await Deno.stat(s);      return stat.isFile();    } catch (e) {      return false;    }  };  if (await fileExists(filepath)) {    return filepath;  }  if (filepath.endsWith("/") && (await fileExists(filepath + "index.html"))) {    return filepath + "index.html";  } else if (await fileExists(filepath + ".html")) {    return filepath + ".html";  }}
export function serveStatic(dir: string): HttpHandler {  return async req => {    if (req.method === "GET" || req.method === "HEAD") {      const url = new URL(req.url, "http://127.0.0.1");      const filepath = await resolveFilepath(dir, url.pathname);      if (!filepath) {        return;      }      const stat = await Deno.stat(filepath);      const ext = path.extname(filepath);      const contentType =        media_types.contentType(ext) || "application/octet-stream";      const headers = new Headers({        "Content-Length": stat.len + "",        "Content-Type": contentType      });      if (req.method === "HEAD") {        return req.respond({          status: 200,          headers        });      } else {        const file = await Deno.open(filepath, "r");        try {          await req.respond({ status: 200, headers, body: file });        } finally {          file.close();        }      }    }  };}