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// deno-lint-ignore-file/*! * Port of serve-static (https://github.com/expressjs/serve-static) for Deno. * * Licensed as follows: * * (The MIT License) * * Copyright (c) 2010 Sencha Inc. * Copyright (c) 2011 LearnBoost * Copyright (c) 2011 TJ Holowaychuk * Copyright (c) 2014-2016 Douglas Christopher Wilson * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * 'Software'), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */
import { encodeUrl, escapeHtml, fromFileUrl } from "../../deps.ts";import { createError } from "../utils/createError.ts";import { originalUrl as original, parseUrl } from "../utils/parseUrl.ts";import { hasTrailingSlash, send, sendError } from "../utils/send.ts";import type {  Handler,  NextFunction,  OpineRequest,  OpineResponse,  ParsedURL,} from "../types.ts";
/** * Serve static files. * * @param {string} root * @param {object} [options] * @return {Handler} * @public */export function serveStatic(root: string, options: any = {}): Handler {  // fall-though  const fallthrough = options.fallthrough !== false;
  // default redirect  const redirect = options.redirect !== false;
  // before hook  const before = options.before;
  if (before && typeof before !== "function") {    throw new TypeError("option before must be function");  }
  // setup options for send  options.maxage = options.maxage ?? options.maxAge ?? 0;  options.root = root.startsWith("file:") ? fromFileUrl(root) : root;
  // construct directory listener  const onDirectory = redirect    ? createRedirectDirectoryListener    : createNotFoundDirectoryListener;
  return async function serveStatic(    req: OpineRequest,    res: OpineResponse,    next: NextFunction,  ) {    if (req.method !== "GET" && req.method !== "HEAD") {      if (fallthrough) {        return next();      }
      // method not allowed      res.status = 405;      res.set("Allow", "GET, HEAD");      res.end();      return;    }
    const forwardError = !fallthrough;    const originalUrl = original(req) as ParsedURL;    let path = (parseUrl(req) as ParsedURL).pathname;
    // make sure redirect occurs at mount    if (path === "/" && originalUrl.pathname.substr(-1) !== "/") {      path = "";    }
    options.onDirectory = onDirectory(req, res, path);
    try {      return await send(req, res, path, options);    } catch (err) {      if (forwardError) {        return next(err);      }
      next();    }  };}
/** * Collapse all leading slashes into a single slash * @private */function collapseLeadingSlashes(str: string): string {  let i = 0;  for (; i < str.length; i++) {    if (str.charCodeAt(i) !== 0x2f /* / */) {      break;    }  }
  return i > 1 ? "/" + str.substr(i) : str;}
/** * Create a minimal HTML document. * * @param {string} title * @param {string} body * @private */function createHtmlDocument(title: string, body: string): string {  return "<!DOCTYPE html>\n" +    '<html lang="en">\n' +    "<head>\n" +    '<meta charset="utf-8">\n' +    "<title>" + title + "</title>\n" +    "</head>\n" +    "<body>\n" +    "<pre>" + body + "</pre>\n" +    "</body>\n" +    "</html>\n";}
/** * Create a directory listener that just 404s. * @private */function createNotFoundDirectoryListener(  _req: OpineRequest,  res: OpineResponse,  _path: string,): Function {  return function notFound(): void {    return sendError(res, createError(404));  };}
/** * Create a directory listener that performs a redirect. * @private */function createRedirectDirectoryListener(  req: OpineRequest,  res: OpineResponse,  path: string,): Function {  return function redirect(): void {    if (hasTrailingSlash(path)) {      return sendError(res, createError(404));    }
    // get original URL    const originalUrl = original(req) as ParsedURL;
    // append trailing slash    originalUrl.path = null;    originalUrl.pathname = collapseLeadingSlashes(originalUrl.pathname + "/");
    // reformat the URL    const loc = encodeUrl(originalUrl.pathname);    const doc = createHtmlDocument(      "Redirecting",      'Redirecting to <a href="' + escapeHtml(loc) + '">' +        escapeHtml(loc) + "</a>",    );
    // send redirect response    res.status = 301;    res.set("Content-Type", "text/html; charset=UTF-8");    res.set("Content-Security-Policy", "default-src 'none'");    res.set("X-Content-Type-Options", "nosniff");    res.set("Location", loc);    res.send(doc);  };}