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// Copyright 2019 Yusuke Sakurai. All rights reserved. MIT license.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";import { resolveIndexPath } from "./router_util.ts";
export type ServeStaticOptions = {  /**   * content type resolvers   * .ext -> application/some-type   * By default, .ts/.tsx will be resolved by application/typescript   */  contentTypeMap?: Map<string, string>;  contentDispositionMap?: Map<string, "inline" | "attachment">;  /** Custom filter function for files */  filter?: (file: string) => boolean | Promise<boolean>;};export function serveStatic(  dirOrUrl: string | URL,  opts: ServeStaticOptions = {}): HttpHandler {  const contentTypeMap = new Map<string, string>([    [".ts", "application/javascript"],    [".tsx", "application/javascript"],    ...(opts.contentTypeMap || new Map<string, string>()).entries()  ]);  const contentDispositionMap = opts.contentDispositionMap || new Map([]);  const filter = opts.filter || (() => true);  const dir = dirOrUrl instanceof URL ? dirOrUrl.pathname : dirOrUrl;  return async function serveStatic(req) {    if (req.method === "GET" || req.method === "HEAD") {      const url = new URL(req.url, "http://dummy");      const filepath = await resolveIndexPath(dir, url.pathname);      if (!filepath || !(await filter(filepath))) {        return;      }      const stat = await Deno.stat(filepath);      const ext = path.extname(filepath);      const base = path.basename(filepath);      let contentType =        contentTypeMap.get(ext) ||        media_types.contentType(ext) ||        "application/octet-stream";      const headers = new Headers({        "content-length": stat.len + "",        "content-type": contentType      });      const contentDisposition = contentDispositionMap.get(ext);      if (contentDisposition === "attachment") {        headers.set("content-disposition", `attachment; filename="${base}"`);      } else if (contentDisposition === "inline") {        headers.set("content-disposition", "inline");      }      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();        }      }    }  };}