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/*! * Based on https://github.com/jshttp/content-type/blob/master/index.js * Copyright(c) 2015 Douglas Christopher Wilson * Copyright(c) 2020 Henry Zhuang * MIT Licensed */
export type Parameters = { [key: string]: string };
export interface ContentType {  type: string;  parameters?: Parameters;}
class ContentTypeImpl implements ContentType {  constructor(type: string) {    this.type = type;    this.parameters = Object.create(null);  }  type: string;  parameters: Parameters;}
/** * RegExp to match *( ";" parameter ) in RFC 7231 sec 3.1.1.1 * * parameter     = token "=" ( token / quoted-string ) * token         = 1*tchar * tchar         = "!" / "#" / "$" / "%" / "&" / "'" / "*" *               / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" *               / DIGIT / ALPHA *               ; any VCHAR, except delimiters * quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE * qdtext        = HTAB / SP / %x21 / %x23-5B / %x5D-7E / obs-text * obs-text      = %x80-FF * quoted-pair   = "\" ( HTAB / SP / VCHAR / obs-text ) */const PARAM_REGEXP =  /; *([!#$%&'*+.^_`|~0-9A-Za-z-]+) *= *("(?:[\u000b\u0020\u0021\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u000b\u0020-\u00ff])*"|[!#$%&'*+.^_`|~0-9A-Za-z-]+) */g;const TEXT_REGEXP = /^[\u000b\u0020-\u007e\u0080-\u00ff]+$/;const TOKEN_REGEXP = /^[!#$%&'*+.^_`|~0-9A-Za-z-]+$/;
/** * RegExp to match quoted-pair in RFC 7230 sec 3.2.6 * * quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text ) * obs-text    = %x80-FF */const QESC_REGEXP = /\\([\u000b\u0020-\u00ff])/g;
/** * RegExp to match chars that must be quoted-pair in RFC 7230 sec 3.2.6 */const QUOTE_REGEXP = /([\\"])/g;
/** * RegExp to match type in RFC 7231 sec 3.1.1.1 * * media-type = type "/" subtype * type       = token * subtype    = token */const TYPE_REGEXP =  /^[!#$%&'*+.^_`|~0-9A-Za-z-]+\/[!#$%&'*+.^_`|~0-9A-Za-z-]+$/;
/** * Format ContentType object to media type. */export function format(obj: ContentType): string {  const parameters = obj.parameters;  const type = obj.type;
  if (!type || !TYPE_REGEXP.test(type)) {    throw new TypeError("invalid type");  }
  let string = type;
  // append parameters  if (parameters && typeof parameters === "object") {    let param;    const params = Object.keys(parameters).sort();
    for (let i = 0; i < params.length; i++) {      param = params[i];
      if (!TOKEN_REGEXP.test(param)) {        throw new TypeError("invalid parameter name");      }
      string += "; " + param + "=" + qstring(parameters[param]);    }  }
  return string;}
/** * Parse media type to object. */export function parse(str: string): ContentType {  let index = str.indexOf(";");  const type = index !== -1 ? str.substr(0, index).trim() : str.trim();
  if (!TYPE_REGEXP.test(type)) {    throw new TypeError("invalid media type");  }
  const obj = new ContentTypeImpl(type.toLowerCase());
  // parse parameters  if (index !== -1) {    let key;    let match;    let value;
    PARAM_REGEXP.lastIndex = index;
    while ((match = PARAM_REGEXP.exec(str))) {      if (match.index !== index) {        throw new TypeError("invalid parameter format");      }
      index += match[0].length;      key = match[1].toLowerCase();      value = match[2];
      if (value[0] === '"') {        // remove quotes and escapes        value = value          .substr(1, value.length - 2)          .replace(QESC_REGEXP, "$1");      }
      obj.parameters[key] = value;    }
    if (index !== str.length) {      throw new TypeError("invalid parameter format");    }  }
  return obj;}
/** * Quote a string if necessary. */function qstring(val: string): string {  const str = String(val);
  // no need to quote tokens  if (TOKEN_REGEXP.test(str)) {    return str;  }
  if (str.length > 0 && !TEXT_REGEXP.test(str)) {    throw new TypeError("invalid parameter value");  }
  return '"' + str.replace(QUOTE_REGEXP, "\\$1") + '"';}