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/*! * Ported from: https://github.com/jshttp/mime-types and licensed as: * * (The MIT License) * * Copyright (c) 2014 Jonathan Ong <me@jongleberry.com> * Copyright (c) 2015 Douglas Christopher Wilson <doug@somethingdoug.com> * Copyright (c) 2020 the Deno authors * * 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 { db, extname } from "./deps.ts";
const EXTRACT_TYPE_REGEXP = /^\s*([^;\s]*)(?:;|\s|$)/;const TEXT_TYPE_REGEXP = /^text\//i;
/** A map of extensions for a given media type */export const extensions = new Map<string, string[]>();
/** A map of the media type for a given extension */export const types = new Map<string, string>();
/** Internal function to populate the maps based on the Mime DB */function populateMaps(  extensions: Map<string, string[]>,  types: Map<string, string>): void {  const preference = ["nginx", "apache", undefined, "iana"];
  for (const type of Object.keys(db)) {    const mime = db[type];    const exts = mime.extensions;
    if (!exts || !exts.length) {      continue;    }
    extensions.set(type, exts);
    for (const ext of exts) {      const current = types.get(ext);      if (current) {        const from = preference.indexOf(db[current].source);        const to = preference.indexOf(mime.source);
        if (          current !== "application/octet-stream" &&          (from > to ||            (from === to && current.substr(0, 12) === "application/"))        ) {          continue;        }      }
      types.set(ext, type);    }  }}
// Populate the maps upon module loadpopulateMaps(extensions, types);
/** Given a media type return any default charset string.  Returns `undefined` * if not resolvable. */export function charset(type: string): string | undefined {  const m = EXTRACT_TYPE_REGEXP.exec(type);  if (!m) {    return;  }  const [match] = m;  const mime = db[match.toLowerCase()];
  if (mime && mime.charset) {    return mime.charset;  }
  if (TEXT_TYPE_REGEXP.test(match)) {    return "UTF-8";  }}
/** Given an extension, lookup the appropriate media type for that extension. * Likely you should be using `contentType()` though instead. */export function lookup(path: string): string | undefined {  const extension = extname("x." + path)    .toLowerCase()    .substr(1);
  return types.get(extension);}
/** Given an extension or media type, return the full `Content-Type` header * string.  Returns `undefined` if not resolvable. */export function contentType(str: string): string | undefined {  let mime = str.includes("/") ? str : lookup(str);
  if (!mime) {    return;  }
  if (!mime.includes("charset")) {    const cs = charset(mime);    if (cs) {      mime += `; charset=${cs.toLowerCase()}`;    }  }
  return mime;}
/** Given a media type, return the most appropriate extension or return * `undefined` if there is none. */export function extension(type: string): string | undefined {  const match = EXTRACT_TYPE_REGEXP.exec(type);
  if (!match) {    return;  }
  const exts = extensions.get(match[1].toLowerCase());
  if (!exts || !exts.length) {    return;  }
  return exts[0];}