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Filename : validators.js
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/* eslint jsdoc/require-jsdoc: "error" */

'use strict'

const {
  ArrayIsArray,
  ArrayPrototypeIncludes,
  ArrayPrototypeJoin,
  ArrayPrototypeMap,
  NumberIsInteger,
  NumberIsNaN,
  NumberMAX_SAFE_INTEGER,
  NumberMIN_SAFE_INTEGER,
  NumberParseInt,
  ObjectPrototypeHasOwnProperty,
  RegExpPrototypeExec,
  String,
  StringPrototypeToUpperCase,
  StringPrototypeTrim
} = require('../ours/primordials')
const {
  hideStackFrames,
  codes: { ERR_SOCKET_BAD_PORT, ERR_INVALID_ARG_TYPE, ERR_INVALID_ARG_VALUE, ERR_OUT_OF_RANGE, ERR_UNKNOWN_SIGNAL }
} = require('../ours/errors')
const { normalizeEncoding } = require('../ours/util')
const { isAsyncFunction, isArrayBufferView } = require('../ours/util').types
const signals = {}

/**
 * @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) {
  if (typeof value === 'undefined') {
    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 {number|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 = 4294967295
  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} */
function validateString(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} */
function validateNumber(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} */
function validateBoolean(value, name) {
  if (typeof value !== 'boolean') throw new ERR_INVALID_ARG_TYPE(name, 'boolean', value)
}

/**
 * @param {any} options
 * @param {string} key
 * @param {boolean} defaultValue
 * @returns {boolean}
 */
function getOwnPropertyValueOrDefault(options, key, defaultValue) {
  return options == null || !ObjectPrototypeHasOwnProperty(options, key) ? defaultValue : options[key]
}

/**
 * @callback validateObject
 * @param {*} value
 * @param {string} name
 * @param {{
 *   allowArray?: boolean,
 *   allowFunction?: boolean,
 *   nullable?: boolean
 * }} [options]
 */

/** @type {validateObject} */
const validateObject = hideStackFrames((value, name, options = null) => {
  const allowArray = getOwnPropertyValueOrDefault(options, 'allowArray', false)
  const allowFunction = getOwnPropertyValueOrDefault(options, 'allowFunction', false)
  const nullable = getOwnPropertyValueOrDefault(options, 'nullable', false)
  if (
    (!nullable && value === null) ||
    (!allowArray && ArrayIsArray(value)) ||
    (typeof value !== 'object' && (!allowFunction || typeof value !== '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} */
function validateStringArray(value, name) {
  validateArray(value, name)
  for (let i = 0; i < value.length; i++) {
    validateString(value[i], `${name}[${i}]`)
  }
}

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

/** @type {validateBooleanArray} */
function validateBooleanArray(value, name) {
  validateArray(value, name)
  for (let i = 0; i < value.length; i++) {
    validateBoolean(value[i], `${name}[${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}
 */
function validateSignalName(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
 */
function validateEncoding(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}
 */
function validatePort(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
 */
function validateLinkHeaderFormat(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"'
    )
  }
}

/**
 * @param {any} hints
 * @return {string}
 */
function validateLinkHeaderValue(hints) {
  if (typeof hints === 'string') {
    validateLinkHeaderFormat(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(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"'
  )
}
module.exports = {
  isInt32,
  isUint32,
  parseFileMode,
  validateArray,
  validateStringArray,
  validateBooleanArray,
  validateAbortSignalArray,
  validateBoolean,
  validateBuffer,
  validateDictionary,
  validateEncoding,
  validateFunction,
  validateInt32,
  validateInteger,
  validateNumber,
  validateObject,
  validateOneOf,
  validatePlainFunction,
  validatePort,
  validateSignalName,
  validateString,
  validateUint32,
  validateUndefined,
  validateUnion,
  validateAbortSignal,
  validateLinkHeaderValue
}