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// Copyright 2018-2020 the oak authors. All rights reserved. MIT license.
import { isAbsolute, join, normalize, resolve, sep } from "./deps.ts";import { createHttpError } from "./httpError.ts";
/** Safely decode a URI component, where if it fails, instead of throwing, * just returns the original string */export function decodeComponent(text: string) {  try {    return decodeURIComponent(text);  } catch {    return text;  }}
/** Determines if a string "looks" like HTML */export function isHtml(value: string): boolean {  return /^\s*<(?:!DOCTYPE|html|body)/i.test(value);}
/*! * Adapted directly from https://github.com/pillarjs/resolve-path * which is licensed as follows: * * The MIT License (MIT) * * Copyright (c) 2014 Jonathan Ong <me@jongleberry.com> * Copyright (c) 2015-2018 Douglas Christopher Wilson <doug@somethingdoug.com> * * 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. */
const UP_PATH_REGEXP = /(?:^|[\\/])\.\.(?:[\\/]|$)/;
export function resolvePath(relativePath: string): string;export function resolvePath(rootPath: string, relativePath: string): string;export function resolvePath(rootPath: string, relativePath?: string): string {  let path = relativePath;  let root = rootPath;
  // root is optional, similar to root.resolve  if (arguments.length === 1) {    path = rootPath;    root = Deno.cwd();  }
  if (path == null) {    throw new TypeError("Argument relativePath is required.");  }
  // containing NULL bytes is malicious  if (path.includes("\0")) {    throw createHttpError(400, "Malicious Path");  }
  // path should never be absolute  if (isAbsolute(path)) {    throw createHttpError(400, "Malicious Path");  }
  // path outside root  if (UP_PATH_REGEXP.test(normalize("." + sep + path))) {    throw createHttpError(403);  }
  // join the relative path  return normalize(join(resolve(root), path));}