1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677
// Copyright 2019 Yusuke Sakurai. All rights reserved. MIT license.import * as path from "./vendor/https/deno.land/std/path/mod.ts";import { resolveIndexPath } from "./matcher.ts";import { ServeHandler } from "./server.ts";import { contentTypeByExt } from "./media_types.ts";
export type ServeStaticOptions = {  /**   * Custom Content-Type mapper.   * .ext -> application/some-type   * By default, .ts/.tsx will be resolved by application/typescript.   */  contentTypeMap?: Map<string, string>;  /**   * Custom Content-Disposition mapper.   * .ext -> "inline" | "attachment"   * By default, Content-Disposition header won't be set for any files.   */  contentDispositionMap?: Map<string, "inline" | "attachment">;  /** Custom filter function for files */  filter?: (file: string) => boolean | Promise<boolean>;};
/** * Serve static files in specified directory. * */export function serveStatic(  dir: string,  opts: ServeStaticOptions = {},): ServeHandler {  const contentTypeMap = new Map<string, string>([    ...(opts.contentTypeMap || new Map<string, string>()).entries(),  ]);  const contentDispositionMap = opts.contentDispositionMap || new Map([]);  const filter = opts.filter || (() => true);  return async function serveStatic(req) {    if (req.method === "GET" || req.method === "HEAD") {      const filepath = await resolveIndexPath(        dir,        decodeURIComponent(req.path),      );      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) ||        contentTypeByExt(ext) ||        "application/octet-stream";      const headers = new Headers({        "content-length": stat.size + "",        "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();        }      }    }  };}