misc-utils-of-mine-generic/src/mime.ts

Miscellaneous utilities for JavaScript/TypeScript that I often use

/**
 * Returns mimetype associated to given extension or undefined if none is found. This only considers nginx
 * mime type list form https://github.com/jshttp/mime-db
 */
export function getMimeTypeForExtension(extension: string) {
  return Object.keys(commonExtensionMimeTypeMap).find(a => commonExtensionMimeTypeMap[a].extensions.includes(extension))
}

/**
 * Returns known extensions for given MimeType or undefined if none is found. This only considers nginx mime
 * type list form https://github.com/jshttp/mime-db
 */
export function getExtensionsForMimeType(mimeType: string) {
  const found = Object.keys(commonExtensionMimeTypeMap).find(a => a === mimeType)
  return found && (commonExtensionMimeTypeMap[found].extensions as string[])
}

// taken from https://github.com/jshttp/mime-db
const commonExtensionMimeTypeMap: any = {
  'application/atom+xml': {
    extensions: ['atom']
  },
  'application/java-archive': {
    extensions: ['jar', 'war', 'ear']
  },
  'application/javascript': {
    extensions: ['js']
  },
  'application/json': {
    extensions: ['json']
  },
  'application/mac-binhex40': {
    extensions: ['hqx']
  },
  'application/msword': {
    extensions: ['doc']
  },
  'application/octet-stream': {
    extensions: ['bin', 'exe', 'dll', 'deb', 'dmg', 'iso', 'img', 'msi', 'msp', 'msm']
  },
  'application/pdf': {
    extensions: ['pdf']
  },
  'application/postscript': {
    extensions: ['ps', 'eps', 'ai']
  },
  'application/rss+xml': {
    extensions: ['rss']
  },
  'application/rtf': {
    extensions: ['rtf']
  },
  'application/vnd.apple.mpegurl': {
    extensions: ['m3u8']
  },
  'application/vnd.google-earth.kml+xml': {
    extensions: ['kml']
  },
  'application/vnd.google-earth.kmz': {
    extensions: ['kmz']
  },
  'application/vnd.ms-excel': {
    extensions: ['xls']
  },
  'application/vnd.ms-fontobject': {
    extensions: ['eot']
  },
  'application/vnd.ms-powerpoint': {
    extensions: ['ppt']
  },
  'application/vnd.oasis.opendocument.graphics': {
    extensions: ['odg']
  },
  'application/vnd.oasis.opendocument.presentation': {
    extensions: ['odp']
  },
  'application/vnd.oasis.opendocument.spreadsheet': {
    extensions: ['ods']
  },
  'application/vnd.oasis.opendocument.text': {
    extensions: ['odt']
  },
  'application/vnd.openxmlformats-officedocument.presentationml.presentation': {
    extensions: ['pptx']
  },
  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': {
    extensions: ['xlsx']
  },
  'application/vnd.openxmlformats-officedocument.wordprocessingml.document': {
    extensions: ['docx']
  },
  'application/vnd.wap.wmlc': {
    extensions: ['wmlc']
  },
  'application/x-7z-compressed': {
    extensions: ['7z']
  },
  'application/x-cocoa': {
    extensions: ['cco']
  },
  'application/x-java-archive-diff': {
    extensions: ['jardiff']
  },
  'application/x-java-jnlp-file': {
    extensions: ['jnlp']
  },
  'application/x-makeself': {
    extensions: ['run']
  },
  'application/x-perl': {
    extensions: ['pl', 'pm']
  },
  'application/x-pilot': {
    extensions: ['prc', 'pdb']
  },
  'application/x-rar-compressed': {
    extensions: ['rar']
  },
  'application/x-redhat-package-manager': {
    extensions: ['rpm']
  },
  'application/x-sea': {
    extensions: ['sea']
  },
  'application/x-shockwave-flash': {
    extensions: ['swf']
  },
  'application/x-stuffit': {
    extensions: ['sit']
  },
  'application/x-tcl': {
    extensions: ['tcl', 'tk']
  },
  'application/x-x509-ca-cert': {
    extensions: ['der', 'pem', 'crt']
  },
  'application/x-xpinstall': {
    extensions: ['xpi']
  },
  'application/xhtml+xml': {
    extensions: ['xhtml']
  },
  'application/xspf+xml': {
    extensions: ['xspf']
  },
  'application/zip': {
    extensions: ['zip']
  },
  'audio/midi': {
    extensions: ['mid', 'midi', 'kar']
  },
  'audio/mpeg': {
    extensions: ['mp3']
  },
  'audio/ogg': {
    extensions: ['ogg']
  },
  'audio/x-m4a': {
    extensions: ['m4a']
  },
  'audio/x-realaudio': {
    extensions: ['ra']
  },
  'font/woff': {
    extensions: ['woff']
  },
  'font/woff2': {
    extensions: ['woff2']
  },
  'image/gif': {
    extensions: ['gif']
  },
  'image/jpeg': {
    extensions: ['jpeg', 'jpg']
  },
  'image/png': {
    extensions: ['png']
  },
  'image/svg+xml': {
    extensions: ['svg', 'svgz']
  },
  'image/tiff': {
    extensions: ['tif', 'tiff']
  },
  'image/vnd.wap.wbmp': {
    extensions: ['wbmp']
  },
  'image/webp': {
    extensions: ['webp']
  },
  'image/x-icon': {
    extensions: ['ico']
  },
  'image/x-jng': {
    extensions: ['jng']
  },
  'image/x-ms-bmp': {
    extensions: ['bmp']
  },
  'text/css': {
    extensions: ['css']
  },
  'text/html': {
    extensions: ['html', 'htm', 'shtml']
  },
  'text/mathml': {
    extensions: ['mml']
  },
  'text/plain': {
    extensions: ['txt']
  },
  'text/vnd.sun.j2me.app-descriptor': {
    extensions: ['jad']
  },
  'text/vnd.wap.wml': {
    extensions: ['wml']
  },
  'text/x-component': {
    extensions: ['htc']
  },
  'text/xml': {
    extensions: ['xml']
  },
  'video/3gpp': {
    extensions: ['3gpp', '3gp']
  },
  'video/mp2t': {
    extensions: ['ts']
  },
  'video/mp4': {
    extensions: ['mp4']
  },
  'video/mpeg': {
    extensions: ['mpeg', 'mpg']
  },
  'video/quicktime': {
    extensions: ['mov']
  },
  'video/webm': {
    extensions: ['webm']
  },
  'video/x-flv': {
    extensions: ['flv']
  },
  'video/x-m4v': {
    extensions: ['m4v']
  },
  'video/x-mng': {
    extensions: ['mng']
  },
  'video/x-ms-asf': {
    extensions: ['asx', 'asf']
  },
  'video/x-ms-wmv': {
    extensions: ['wmv']
  },
  'video/x-msvideo': {
    extensions: ['avi']
  }
}