node/lib/internal/validators.js

/* eslint jsdoc/require-jsdoc: "error" */

'use strict';

const {
  ArrayIsArray,
  ArrayPrototypeIncludes,
  ArrayPrototypeJoin,
  ArrayPrototypeMap,
  NumberIsFinite,
  NumberIsInteger,
  NumberIsNaN,
  NumberMAX_SAFE_INTEGER,
  NumberMIN_SAFE_INTEGER,
  NumberParseInt,
  ObjectPrototypeHasOwnProperty,
  RegExpPrototypeExec,
  String,
  StringPrototypeToUpperCase,
  StringPrototypeTrim,
} = primordials;

const {
  codes: {
    ERR_INVALID_ARG_TYPE: { HideStackFramesError: ERR_INVALID_ARG_TYPE },
    ERR_INVALID_ARG_VALUE: { HideStackFramesError: ERR_INVALID_ARG_VALUE },
    ERR_OUT_OF_RANGE: { HideStackFramesError: ERR_OUT_OF_RANGE },
    ERR_SOCKET_BAD_PORT: { HideStackFramesError: ERR_SOCKET_BAD_PORT },
    ERR_UNKNOWN_SIGNAL: { HideStackFramesError: ERR_UNKNOWN_SIGNAL },
  },
  hideStackFrames,
} = require('internal/errors');
const { normalizeEncoding } = require('internal/util');
const {
  isAsyncFunction,
  isArrayBufferView,
} = require('internal/util/types');
const { signals } = internalBinding('constants').os;

/**
 * @param {*} value
 * @returns {boolean}
 */
function isInt32(value) {
  return value === (value | 0);
}

/**
 * @param {*} value
 * @returns {boolean}
 */
function isUint32(value) {
  return value === (value >>> 0);
}

const octalReg = /^[0-7]+$/;
const modeDesc = 'must be a 32-bit unsigned integer or an octal string';

/**
 * Parse and validate values that will be converted into mode_t (the S_*
 * constants). Only valid numbers and octal strings are allowed. They could be
 * converted to 32-bit unsigned integers or non-negative signed integers in the
 * C++ land, but any value higher than 0o777 will result in platform-specific
 * behaviors.
 * @param {*} value Values to be validated
 * @param {string} name Name of the argument
 * @param {number} [def] If specified, will be returned for invalid values
 * @returns {number}
 */
function parseFileMode(value, name, def) {
  value ??= def;
  if (typeof value === 'string') {
    if (RegExpPrototypeExec(octalReg, value) === null) {
      throw new ERR_INVALID_ARG_VALUE(name, value, modeDesc);
    }
    value = NumberParseInt(value, 8);
  }

  validateUint32(value, name);
  return value;
}

/**
 * @callback validateInteger
 * @param {*} value
 * @param {string} name
 * @param {number} [min]
 * @param {number} [max]
 * @returns {asserts value is number}
 */

/** @type {validateInteger} */
const validateInteger = hideStackFrames(
  (value, name, min = NumberMIN_SAFE_INTEGER, max = NumberMAX_SAFE_INTEGER) => {
    if (typeof value !== 'number')
      throw new ERR_INVALID_ARG_TYPE(name, 'number', value);
    if (!NumberIsInteger(value))
      throw new ERR_OUT_OF_RANGE(name, 'an integer', value);
    if (value < min || value > max)
      throw new ERR_OUT_OF_RANGE(name, `>= ${min} && <= ${max}`, value);
  },
);

/**
 * @callback validateInt32
 * @param {*} value
 * @param {string} name
 * @param {number} [min]
 * @param {number} [max]
 * @returns {asserts value is number}
 */

/** @type {validateInt32} */
const validateInt32 = hideStackFrames(
  (value, name, min = -2147483648, max = 2147483647) => {
    // The defaults for min and max correspond to the limits of 32-bit integers.
    if (typeof value !== 'number') {
      throw new ERR_INVALID_ARG_TYPE(name, 'number', value);
    }
    if (!NumberIsInteger(value)) {
      throw new ERR_OUT_OF_RANGE(name, 'an integer', value);
    }
    if (value < min || value > max) {
      throw new ERR_OUT_OF_RANGE(name, `>= ${min} && <= ${max}`, value);
    }
  },
);

/**
 * @callback validateUint32
 * @param {*} value
 * @param {string} name
 * @param {boolean} [positive=false]
 * @returns {asserts value is number}
 */

/** @type {validateUint32} */
const validateUint32 = hideStackFrames((value, name, positive = false) => {
  if (typeof value !== 'number') {
    throw new ERR_INVALID_ARG_TYPE(name, 'number', value);
  }
  if (!NumberIsInteger(value)) {
    throw new ERR_OUT_OF_RANGE(name, 'an integer', value);
  }
  const min = positive ? 1 : 0;
  // 2 ** 32 === 4294967296
  const max = 4_294_967_295;
  if (value < min || value > max) {
    throw new ERR_OUT_OF_RANGE(name, `>= ${min} && <= ${max}`, value);
  }
});

/**
 * @callback validateString
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is string}
 */

/** @type {validateString} */
const validateString = hideStackFrames((value, name) => {
  if (typeof value !== 'string')
    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
});

/**
 * @callback validateNumber
 * @param {*} value
 * @param {string} name
 * @param {number} [min]
 * @param {number} [max]
 * @returns {asserts value is number}
 */

/** @type {validateNumber} */
const validateNumber = hideStackFrames((value, name, min = undefined, max) => {
  if (typeof value !== 'number')
    throw new ERR_INVALID_ARG_TYPE(name, 'number', value);

  if ((min != null && value < min) || (max != null && value > max) ||
    ((min != null || max != null) && NumberIsNaN(value))) {
    throw new ERR_OUT_OF_RANGE(
      name,
      `${min != null ? `>= ${min}` : ''}${min != null && max != null ? ' && ' : ''}${max != null ? `<= ${max}` : ''}`,
      value);
  }
});

/**
 * @callback validateOneOf
 * @template T
 * @param {T} value
 * @param {string} name
 * @param {T[]} oneOf
 */

/** @type {validateOneOf} */
const validateOneOf = hideStackFrames((value, name, oneOf) => {
  if (!ArrayPrototypeIncludes(oneOf, value)) {
    const allowed = ArrayPrototypeJoin(
      ArrayPrototypeMap(oneOf, (v) =>
        (typeof v === 'string' ? `'${v}'` : String(v))),
      ', ');
    const reason = 'must be one of: ' + allowed;
    throw new ERR_INVALID_ARG_VALUE(name, value, reason);
  }
});

/**
 * @callback validateBoolean
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is boolean}
 */

/** @type {validateBoolean} */
const validateBoolean = hideStackFrames((value, name) => {
  if (typeof value !== 'boolean')
    throw new ERR_INVALID_ARG_TYPE(name, 'boolean', value);
});

const kValidateObjectNone = 0;
const kValidateObjectAllowNullable = 1 << 0;
const kValidateObjectAllowArray = 1 << 1;
const kValidateObjectAllowFunction = 1 << 2;
const kValidateObjectAllowObjects = kValidateObjectAllowArray |
  kValidateObjectAllowFunction;
const kValidateObjectAllowObjectsAndNull = kValidateObjectAllowNullable |
  kValidateObjectAllowArray |
  kValidateObjectAllowFunction;

/**
 * @callback validateObject
 * @param {*} value
 * @param {string} name
 * @param {number} [options]
 */

/** @type {validateObject} */
const validateObject = hideStackFrames(
  (value, name, options = kValidateObjectNone) => {
    if (options === kValidateObjectNone) {
      if (value === null || ArrayIsArray(value)) {
        throw new ERR_INVALID_ARG_TYPE(name, 'Object', value);
      }

      if (typeof value !== 'object') {
        throw new ERR_INVALID_ARG_TYPE(name, 'Object', value);
      }
    } else {
      const throwOnNullable = (kValidateObjectAllowNullable & options) === 0;

      if (throwOnNullable && value === null) {
        throw new ERR_INVALID_ARG_TYPE(name, 'Object', value);
      }

      const throwOnArray = (kValidateObjectAllowArray & options) === 0;

      if (throwOnArray && ArrayIsArray(value)) {
        throw new ERR_INVALID_ARG_TYPE(name, 'Object', value);
      }

      const throwOnFunction = (kValidateObjectAllowFunction & options) === 0;
      const typeofValue = typeof value;

      if (typeofValue !== 'object' && (throwOnFunction || typeofValue !== 'function')) {
        throw new ERR_INVALID_ARG_TYPE(name, 'Object', value);
      }
    }
  });

/**
 * @callback validateDictionary - We are using the Web IDL Standard definition
 *                                of "dictionary" here, which means any value
 *                                whose Type is either Undefined, Null, or
 *                                Object (which includes functions).
 * @param {*} value
 * @param {string} name
 * @see https://webidl.spec.whatwg.org/#es-dictionary
 * @see https://tc39.es/ecma262/#table-typeof-operator-results
 */

/** @type {validateDictionary} */
const validateDictionary = hideStackFrames(
  (value, name) => {
    if (value != null && typeof value !== 'object' && typeof value !== 'function') {
      throw new ERR_INVALID_ARG_TYPE(name, 'a dictionary', value);
    }
  });

/**
 * @callback validateArray
 * @param {*} value
 * @param {string} name
 * @param {number} [minLength]
 * @returns {asserts value is any[]}
 */

/** @type {validateArray} */
const validateArray = hideStackFrames((value, name, minLength = 0) => {
  if (!ArrayIsArray(value)) {
    throw new ERR_INVALID_ARG_TYPE(name, 'Array', value);
  }
  if (value.length < minLength) {
    const reason = `must be longer than ${minLength}`;
    throw new ERR_INVALID_ARG_VALUE(name, value, reason);
  }
});

/**
 * @callback validateStringArray
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is string[]}
 */

/** @type {validateStringArray} */
const validateStringArray = hideStackFrames((value, name) => {
  validateArray(value, name);
  for (let i = 0; i < value.length; ++i) {
    // Don't use validateString here for performance reasons, as
    // we would generate intermediate strings for the name.
    if (typeof value[i] !== 'string') {
      throw new ERR_INVALID_ARG_TYPE(`${name}[${i}]`, 'string', value[i]);
    }
  }
});

/**
 * @callback validateBooleanArray
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is boolean[]}
 */

/** @type {validateBooleanArray} */
const validateBooleanArray = hideStackFrames((value, name) => {
  validateArray(value, name);
  for (let i = 0; i < value.length; ++i) {
    // Don't use validateBoolean here for performance reasons, as
    // we would generate intermediate strings for the name.
    if (value[i] !== true && value[i] !== false) {
      throw new ERR_INVALID_ARG_TYPE(`${name}[${i}]`, 'boolean', value[i]);
    }
  }
});

/**
 * @callback validateAbortSignalArray
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is AbortSignal[]}
 */

/** @type {validateAbortSignalArray} */
function validateAbortSignalArray(value, name) {
  validateArray(value, name);
  for (let i = 0; i < value.length; i++) {
    const signal = value[i];
    const indexedName = `${name}[${i}]`;
    if (signal == null) {
      throw new ERR_INVALID_ARG_TYPE(indexedName, 'AbortSignal', signal);
    }
    validateAbortSignal(signal, indexedName);
  }
}

/**
 * @param {*} signal
 * @param {string} [name='signal']
 * @returns {asserts signal is keyof signals}
 */
const validateSignalName = hideStackFrames((signal, name = 'signal') => {
  validateString(signal, name);

  if (signals[signal] === undefined) {
    if (signals[StringPrototypeToUpperCase(signal)] !== undefined) {
      throw new ERR_UNKNOWN_SIGNAL(signal +
                                   ' (signals must use all capital letters)');
    }

    throw new ERR_UNKNOWN_SIGNAL(signal);
  }
});

/**
 * @callback validateBuffer
 * @param {*} buffer
 * @param {string} [name='buffer']
 * @returns {asserts buffer is ArrayBufferView}
 */

/** @type {validateBuffer} */
const validateBuffer = hideStackFrames((buffer, name = 'buffer') => {
  if (!isArrayBufferView(buffer)) {
    throw new ERR_INVALID_ARG_TYPE(name,
                                   ['Buffer', 'TypedArray', 'DataView'],
                                   buffer);
  }
});

/**
 * @param {string} data
 * @param {string} encoding
 */
const validateEncoding = hideStackFrames((data, encoding) => {
  const normalizedEncoding = normalizeEncoding(encoding);
  const length = data.length;

  if (normalizedEncoding === 'hex' && length % 2 !== 0) {
    throw new ERR_INVALID_ARG_VALUE('encoding', encoding,
                                    `is invalid for data of length ${length}`);
  }
});

/**
 * Check that the port number is not NaN when coerced to a number,
 * is an integer and that it falls within the legal range of port numbers.
 * @param {*} port
 * @param {string} [name='Port']
 * @param {boolean} [allowZero=true]
 * @returns {number}
 */
const validatePort = hideStackFrames((port, name = 'Port', allowZero = true) => {
  if ((typeof port !== 'number' && typeof port !== 'string') ||
      (typeof port === 'string' && StringPrototypeTrim(port).length === 0) ||
      +port !== (+port >>> 0) ||
      port > 0xFFFF ||
      (port === 0 && !allowZero)) {
    throw new ERR_SOCKET_BAD_PORT(name, port, allowZero);
  }
  return port | 0;
});

/**
 * @callback validateAbortSignal
 * @param {*} signal
 * @param {string} name
 */

/** @type {validateAbortSignal} */
const validateAbortSignal = hideStackFrames((signal, name) => {
  if (signal !== undefined &&
      (signal === null ||
       typeof signal !== 'object' ||
       !('aborted' in signal))) {
    throw new ERR_INVALID_ARG_TYPE(name, 'AbortSignal', signal);
  }
});

/**
 * @callback validateFunction
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is Function}
 */

/** @type {validateFunction} */
const validateFunction = hideStackFrames((value, name) => {
  if (typeof value !== 'function')
    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
});

/**
 * @callback validatePlainFunction
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is Function}
 */

/** @type {validatePlainFunction} */
const validatePlainFunction = hideStackFrames((value, name) => {
  if (typeof value !== 'function' || isAsyncFunction(value))
    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
});

/**
 * @callback validateUndefined
 * @param {*} value
 * @param {string} name
 * @returns {asserts value is undefined}
 */

/** @type {validateUndefined} */
const validateUndefined = hideStackFrames((value, name) => {
  if (value !== undefined)
    throw new ERR_INVALID_ARG_TYPE(name, 'undefined', value);
});

/**
 * @template T
 * @param {T} value
 * @param {string} name
 * @param {T[]} union
 */
function validateUnion(value, name, union) {
  if (!ArrayPrototypeIncludes(union, value)) {
    throw new ERR_INVALID_ARG_TYPE(name, `('${ArrayPrototypeJoin(union, '|')}')`, value);
  }
}

/*
  The rules for the Link header field are described here:
  https://www.rfc-editor.org/rfc/rfc8288.html#section-3

  This regex validates any string surrounded by angle brackets
  (not necessarily a valid URI reference) followed by zero or more
  link-params separated by semicolons.
*/
const linkValueRegExp = /^(?:<[^>]*>)(?:\s*;\s*[^;"\s]+(?:=(")?[^;"\s]*\1)?)*$/;

/**
 * @param {any} value
 * @param {string} name
 */
const validateLinkHeaderFormat = hideStackFrames((value, name) => {
  if (
    typeof value === 'undefined' ||
    !RegExpPrototypeExec(linkValueRegExp, value)
  ) {
    throw new ERR_INVALID_ARG_VALUE(
      name,
      value,
      'must be an array or string of format "</styles.css>; rel=preload; as=style"',
    );
  }
});

const validateInternalField = hideStackFrames((object, fieldKey, className) => {
  if (typeof object !== 'object' || object === null || !ObjectPrototypeHasOwnProperty(object, fieldKey)) {
    throw new ERR_INVALID_ARG_TYPE('this', className, object);
  }
});

/**
 * @param {any} hints
 * @return {string}
 */
const validateLinkHeaderValue = hideStackFrames((hints) => {
  if (typeof hints === 'string') {
    validateLinkHeaderFormat.withoutStackTrace(hints, 'hints');
    return hints;
  } else if (ArrayIsArray(hints)) {
    const hintsLength = hints.length;
    let result = '';

    if (hintsLength === 0) {
      return result;
    }

    for (let i = 0; i < hintsLength; i++) {
      const link = hints[i];
      validateLinkHeaderFormat.withoutStackTrace(link, 'hints');
      result += link;

      if (i !== hintsLength - 1) {
        result += ', ';
      }
    }

    return result;
  }

  throw new ERR_INVALID_ARG_VALUE(
    'hints',
    hints,
    'must be an array or string of format "</styles.css>; rel=preload; as=style"',
  );
});

// 1. Returns false for undefined and NaN
// 2. Returns true for finite numbers
// 3. Throws ERR_INVALID_ARG_TYPE for non-numbers
// 4. Throws ERR_OUT_OF_RANGE for infinite numbers
const validateFiniteNumber = hideStackFrames((number, name) => {
  // Common case
  if (number === undefined) {
    return false;
  }

  if (NumberIsFinite(number)) {
    return true; // Is a valid number
  }

  if (NumberIsNaN(number)) {
    return false;
  }

  validateNumber(number, name);

  // Infinite numbers
  throw new ERR_OUT_OF_RANGE(name, 'a finite number', number);
});

// 1. Returns def for number when it's undefined or NaN
// 2. Returns number for finite numbers >= lower and <= upper
// 3. Throws ERR_INVALID_ARG_TYPE for non-numbers
// 4. Throws ERR_OUT_OF_RANGE for infinite numbers or numbers > upper or < lower
const checkRangesOrGetDefault = hideStackFrames(
  (number, name, lower, upper, def) => {
    if (!validateFiniteNumber(number, name)) {
      return def;
    }
    if (number < lower || number > upper) {
      throw new ERR_OUT_OF_RANGE(name, `>= ${lower} and <= ${upper}`, number);
    }
    return number;
  },
);

module.exports = {
  isInt32,
  isUint32,
  parseFileMode,
  validateArray,
  validateStringArray,
  validateBooleanArray,
  validateAbortSignalArray,
  validateBoolean,
  validateBuffer,
  validateDictionary,
  validateEncoding,
  validateFunction,
  validateInt32,
  validateInteger,
  validateNumber,
  validateObject,
  kValidateObjectNone,
  kValidateObjectAllowNullable,
  kValidateObjectAllowArray,
  kValidateObjectAllowFunction,
  kValidateObjectAllowObjects,
  kValidateObjectAllowObjectsAndNull,
  validateOneOf,
  validatePlainFunction,
  validatePort,
  validateSignalName,
  validateString,
  validateUint32,
  validateUndefined,
  validateUnion,
  validateAbortSignal,
  validateLinkHeaderValue,
  validateInternalField,
  validateFiniteNumber,
  checkRangesOrGetDefault,
};