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/*! * Adapted from koa-send at https://github.com/koajs/send and which is licensed * with the MIT license. */
import { sep, parse, extname, basename } from '../package.ts';import { resolvePath } from './resolve-path.ts';
export function decodeComponent(text: string) {  try {    return decodeURIComponent(text);  } catch {    return text;  }}
export interface SendOptions {  /** Browser cache max-age in milliseconds. (defaults to `0`) */  maxage?: number;
  /** Tell the browser the resource is immutable and can be cached   * indefinitely. (defaults to `false`) */  immutable?: boolean;
  /** Allow transfer of hidden files. (defaults to `false`) */  hidden?: boolean;
  /** Root directory to restrict file access. */  root: string;
  /** Name of the index file to serve automatically when visiting the root   * location. (defaults to none) */  index?: string;
  /** Try to serve the gzipped version of a file automatically when gzip is   * supported by a client and if the requested file with `.gz` extension   * exists. (defaults to `true`). */  gzip?: boolean;
  /** Try to serve the brotli version of a file automatically when brotli is   * supported by a client and if the requested file with `.br` extension   * exists. (defaults to `true`) */  brotli?: boolean;
  /** If `true`, format the path to serve static file servers and not require a   * trailing slash for directories, so that you can do both `/directory` and   * `/directory/`. (defaults to `true`) */  format?: boolean;
  /** Try to match extensions from passed array to search for file when no   * extension is sufficed in URL. First found is served. (defaults to   * `undefined`) */  extensions?: string[];}
function isHidden(root: string, path: string) {  const pathArr = path.substr(root.length).split(sep);  for (const segment of pathArr) {    if (segment[0] === '.') {      return true;    }    return false;  }}
async function exists(path: string): Promise<boolean> {  try {    return (await Deno.stat(path)).isFile();  } catch {    return false;  }}
function toUTCString(value: number): string {  return new Date(value).toUTCString();}
/** Asynchronously fulfill a response with a file from the local file * system. */export async function send(  { request, response },  path: string,  options: SendOptions = { root: '' }): Promise<string | undefined> {  const {    brotli = true,    extensions,    format = true,    gzip = true,    index,    hidden = false,    immutable = false,    maxage = 0,    root  } = options;  const trailingSlash = path[path.length - 1] === '/';  path = decodeComponent(path.substr(parse(path).root.length));  if (index && trailingSlash) {    path += index;  }  // normalize  path = resolvePath(root, path);
  if (!hidden && isHidden(root, path)) {    return;  }
  let encodingExt = '';  if (brotli && (await exists(`${path}.br`))) {    path = `${path}.br`;    response.headers.set('Content-Encoding', 'br');    response.headers.delete('Content-Length');    encodingExt = '.br';  } else if (gzip && (await exists(`${path}.gz`))) {    path = `${path}.gz`;    response.headers.set('Content-Encoding', 'gzip');    response.headers.delete('Content-Length');    encodingExt = '.gz';  }
  if (extensions && !/\.[^/]*$/.exec(path)) {    for (let ext of extensions) {      if (!/^\./.exec(ext)) {        ext = `.${ext}`;      }      if (await exists(`${path}${ext}`)) {        path += ext;        break;      }    }  }
  let stats: Deno.FileInfo;  try {      stats = await Deno.stat(path);
    if (stats.isDirectory()) {      if (format && index) {        path += `/${index}`;        stats = await Deno.stat(path);      } else {        return;      }    }  } catch (err) {    if (err instanceof Deno.DenoError) {      if (err.kind === Deno.ErrorKind.NotFound) {        throw new Error(err.message); // 404      }    }    throw  new Error(err.message); // 500  }
  response.headers.set('Content-Length', String(stats.len));  if (!response.headers.has('Last-Modified') && stats.modified) {    response.headers.set('Last-Modified', toUTCString(stats.modified));  }  if (!response.headers.has('Cache-Control')) {    const directives = [`max-age=${(maxage / 1000) | 0}`];    if (immutable) {      directives.push('immutable');    }    response.headers.set('Cache-Control', directives.join(','));  }  if (!response.type) {    response.type =      encodingExt !== '' ? extname(basename(path, encodingExt)) : extname(path);  }  response.body = await Deno.readFile(path);
  return path;}