utils.js

/*
  ATTENTION! This file (but not the functions within) is deprecated.

  You should probably add a new file to `./helpers/` instead of adding a new
  function here.

  One-function-per-file is a better pattern than what we have here.

  If you're refactoring something in here, feel free to break it out to a file
  in `./helpers` if you have the time.
*/

import Im, { fromJS, Set } from "immutable"
import { sanitizeUrl as braintreeSanitizeUrl } from "@braintree/sanitize-url"
import camelCase from "lodash/camelCase"
import upperFirst from "lodash/upperFirst"
import _memoize from "lodash/memoize"
import find from "lodash/find"
import some from "lodash/some"
import eq from "lodash/eq"
import isFunction from "lodash/isFunction"
import { memoizedSampleFromSchema, memoizedCreateXMLExample } from "core/plugins/samples/fn"
import win from "./window"
import cssEscape from "css.escape"
import getParameterSchema from "../helpers/get-parameter-schema"
import randomBytes from "randombytes"
import shaJs from "sha.js"
import YAML from "js-yaml"


const DEFAULT_RESPONSE_KEY = "default"

export const isImmutable = (maybe) => Im.Iterable.isIterable(maybe)

export function objectify (thing) {
  if(!isObject(thing))
    return {}
  if(isImmutable(thing))
    return thing.toJS()
  return thing
}

export function arrayify (thing) {
  if(!thing)
    return []

  if(thing.toArray)
    return thing.toArray()

  return normalizeArray(thing)
}

export function fromJSOrdered(js) {
  if (isImmutable(js)) {
    return js // Can't do much here
  }
  if (js instanceof win.File) {
    return js
  }
  if (!isObject(js)) {
    return js
  }
  if (Array.isArray(js)) {
    return Im.Seq(js).map(fromJSOrdered).toList()
  }
  if (isFunction(js.entries)) {
    // handle multipart/form-data
    const objWithHashedKeys = createObjWithHashedKeys(js)
    return Im.OrderedMap(objWithHashedKeys).map(fromJSOrdered)
  }
  return Im.OrderedMap(js).map(fromJSOrdered)
}

/**
 * Convert a FormData object into plain object
 * Append a hashIdx and counter to the key name, if multiple exists
 * if single, key name = <original>
 * if multiple, key name = <original><hashIdx><count>
 * @example <caption>single entry for vegetable</caption>
 * fdObj.entries.vegtables: "carrot"
 * // returns newObj.vegetables : "carrot"
 * @example <caption>multiple entries for fruits[]</caption>
 * fdObj.entries.fruits[]: "apple"
 * // returns newObj.fruits[]_**[]1 : "apple"
 * fdObj.entries.fruits[]: "banana"
 * // returns newObj.fruits[]_**[]2 : "banana"
 * fdObj.entries.fruits[]: "grape"
 * // returns newObj.fruits[]_**[]3 : "grape"
 * @param {FormData} fdObj - a FormData object
 * @return {Object} - a plain object
 */
export function createObjWithHashedKeys (fdObj) {
  if (!isFunction(fdObj.entries)) {
    return fdObj // not a FormData object with iterable
  }
  const newObj = {}
  const hashIdx = "_**[]" // our internal identifier
  const trackKeys = {}
  for (let pair of fdObj.entries()) {
    if (!newObj[pair[0]] && !(trackKeys[pair[0]] && trackKeys[pair[0]].containsMultiple)) {
      newObj[pair[0]] = pair[1] // first key name: no hash required
    } else {
      if (!trackKeys[pair[0]]) {
        // initiate tracking key for multiple
        trackKeys[pair[0]] = {
          containsMultiple: true,
          length: 1
        }
        // "reassign" first pair to matching hashed format for multiple
        let hashedKeyFirst = `${pair[0]}${hashIdx}${trackKeys[pair[0]].length}`
        newObj[hashedKeyFirst] = newObj[pair[0]]
        // remove non-hashed key of multiple
        delete newObj[pair[0]] // first
      }
      trackKeys[pair[0]].length += 1
      let hashedKeyCurrent = `${pair[0]}${hashIdx}${trackKeys[pair[0]].length}`
      newObj[hashedKeyCurrent] = pair[1]
    }
  }
  return newObj
}

export function bindToState(obj, state) {
	var newObj = {}
	Object.keys(obj)
  .filter(key => typeof obj[key] === "function")
  .forEach(key => newObj[key] = obj[key].bind(null, state))
	return newObj
}

export function normalizeArray(arr) {
  if(Array.isArray(arr))
    return arr
  return [arr]
}

export function isFn(fn) {
  return typeof fn === "function"
}

export function isObject(obj) {
  return !!obj && typeof obj === "object"
}

export function isFunc(thing) {
  return typeof(thing) === "function"
}

export function isArray(thing) {
  return Array.isArray(thing)
}

// I've changed memoize libs more than once, so I'm using this a way to make that simpler
export const memoize = _memoize

export function objMap(obj, fn) {
  return Object.keys(obj).reduce((newObj, key) => {
    newObj[key] = fn(obj[key], key)
    return newObj
  }, {})
}

export function objReduce(obj, fn) {
  return Object.keys(obj).reduce((newObj, key) => {
    let res = fn(obj[key], key)
    if(res && typeof res === "object")
      Object.assign(newObj, res)
    return newObj
  }, {})
}

// Redux middleware that exposes the system to async actions (like redux-thunk, but with out system instead of (dispatch, getState)
export function systemThunkMiddleware(getSystem) {
  return ({ dispatch, getState }) => { // eslint-disable-line no-unused-vars
    return next => action => {
      if (typeof action === "function") {
        return action(getSystem())
      }

      return next(action)
    }
  }
}

export function defaultStatusCode ( responses ) {
  let codes = responses.keySeq()
  return codes.contains(DEFAULT_RESPONSE_KEY) ? DEFAULT_RESPONSE_KEY : codes.filter( key => (key+"")[0] === "2").sort().first()
}


/**
 * Returns an Immutable List, safely
 * @param {Immutable.Iterable} iterable the iterable to get the key from
 * @param {String|[String]} key either an array of keys, or a single key
 * @returns {Immutable.List} either iterable.get(keys) or an empty Immutable.List
 */
export function getList(iterable, keys) {
  if(!Im.Iterable.isIterable(iterable)) {
    return Im.List()
  }
  let val = iterable.getIn(Array.isArray(keys) ? keys : [keys])
  return Im.List.isList(val) ? val : Im.List()
}

/**
 * Take an immutable map, and convert to a list.
 * Where the keys are merged with the value objects
 * @param {Immutable.Map} map, the map to convert
 * @param {String} key the key to use, when merging the `key`
 * @returns {Immutable.List}
 */
export function mapToList(map, keyNames="key", collectedKeys=Im.Map()) {
  if(!Im.Map.isMap(map) || !map.size) {
    return Im.List()
  }

  if(!Array.isArray(keyNames)) {
    keyNames = [ keyNames ]
  }

  if(keyNames.length < 1) {
    return map.merge(collectedKeys)
  }

  // I need to avoid `flatMap` from merging in the Maps, as well as the lists
  let list = Im.List()
  let keyName = keyNames[0]
  for(let entry of map.entries()) {
    let [key, val] = entry
    let nextList = mapToList(val, keyNames.slice(1), collectedKeys.set(keyName, key))
    if(Im.List.isList(nextList)) {
      list = list.concat(nextList)
    } else {
      list = list.push(nextList)
    }
  }

  return list
}

export function extractFileNameFromContentDispositionHeader(value){
  let patterns = [
    /filename\*=[^']+'\w*'"([^"]+)";?/i,
    /filename\*=[^']+'\w*'([^;]+);?/i,
    /filename="([^;]*);?"/i,
    /filename=([^;]*);?/i
  ]

  let responseFilename
  patterns.some(regex => {
    responseFilename = regex.exec(value)
    return responseFilename !== null
  })

  if (responseFilename !== null && responseFilename.length > 1) {
    try {
      return decodeURIComponent(responseFilename[1])
    } catch(e) {
      console.error(e)
    }
  }

  return null
}

// PascalCase, aka UpperCamelCase
export function pascalCase(str) {
  return upperFirst(camelCase(str))
}

// Remove the ext of a filename, and pascalCase it
export function pascalCaseFilename(filename) {
  return pascalCase(filename.replace(/\.[^./]*$/, ""))
}

// Check if ...
// - new props
// - If immutable, use .is()
// - if in explicit objectList, then compare using _.eq
// - else use ===
export const propChecker = (props, nextProps, objectList=[], ignoreList=[]) => {

  if(Object.keys(props).length !== Object.keys(nextProps).length) {
    return true
  }

  return (
    some(props, (a, name) => {
      if(ignoreList.includes(name)) {
        return false
      }
      let b = nextProps[name]

      if(Im.Iterable.isIterable(a)) {
        return !Im.is(a,b)
      }

      // Not going to compare objects
      if(typeof a === "object" && typeof b === "object") {
        return false
      }

      return a !== b
    })
    || objectList.some( objectPropName => !eq(props[objectPropName], nextProps[objectPropName])))
}

export const validateMaximum = ( val, max ) => {
  if (val > max) {
    return `Value must be less than ${max}`
  }
}

export const validateMinimum = ( val, min ) => {
  if (val < min) {
    return `Value must be greater than ${min}`
  }
}

export const validateNumber = ( val ) => {
  if (!/^-?\d+(\.?\d+)?$/.test(val)) {
    return "Value must be a number"
  }
}

export const validateInteger = ( val ) => {
  if (!/^-?\d+$/.test(val)) {
    return "Value must be an integer"
  }
}

export const validateFile = ( val ) => {
  if ( val && !(val instanceof win.File) ) {
    return "Value must be a file"
  }
}

export const validateBoolean = ( val ) => {
  if ( !(val === "true" || val === "false" || val === true || val === false) ) {
    return "Value must be a boolean"
  }
}

export const validateString = ( val ) => {
  if ( val && typeof val !== "string" ) {
    return "Value must be a string"
  }
}

export const validateDateTime = (val) => {
    if (isNaN(Date.parse(val))) {
        return "Value must be a DateTime"
    }
}

export const validateGuid = (val) => {
    val = val.toString().toLowerCase()
    if (!/^[{(]?[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}[)}]?$/.test(val)) {
        return "Value must be a Guid"
    }
}

export const validateMaxLength = (val, max) => {
  if (val.length > max) {
      return `Value must be no longer than ${max} character${max !== 1 ? "s" : ""}`
  }
}

export const validateUniqueItems = (val, uniqueItems) => {
  if (!val) {
    return
  }
  if (uniqueItems === "true" || uniqueItems === true) {
    const list = fromJS(val)
    const set = list.toSet()
    const hasDuplicates = val.length > set.size
    if(hasDuplicates) {
      let errorsPerIndex = Set()
      list.forEach((item, i) => {
        if(list.filter(v => isFunc(v.equals) ? v.equals(item) : v === item).size > 1) {
          errorsPerIndex = errorsPerIndex.add(i)
        }
      })
      if(errorsPerIndex.size !== 0) {
        return errorsPerIndex.map(i => ({index: i, error: "No duplicates allowed."})).toArray()
      }
    }
  }
}

export const validateMinItems = (val, min) => {
  if (!val && min >= 1 || val && val.length < min) {
      return `Array must contain at least ${min} item${min === 1 ? "" : "s"}`
  }
}

export const validateMaxItems = (val, max) => {
  if (val && val.length > max) {
    return `Array must not contain more then ${max} item${max === 1 ? "" : "s"}`
  }
}

export const validateMinLength = (val, min) => {
  if (val.length < min) {
      return `Value must be at least ${min} character${min !== 1 ? "s" : ""}`
  }
}

export const validatePattern = (val, rxPattern) => {
  var patt = new RegExp(rxPattern)
  if (!patt.test(val)) {
      return "Value must follow pattern " + rxPattern
  }
}

function validateValueBySchema(value, schema, requiredByParam, bypassRequiredCheck, parameterContentMediaType) {
  if(!schema) return []
  let errors = []
  let nullable = schema.get("nullable")
  let requiredBySchema = schema.get("required")
  let maximum = schema.get("maximum")
  let minimum = schema.get("minimum")
  let type = schema.get("type")
  let format = schema.get("format")
  let maxLength = schema.get("maxLength")
  let minLength = schema.get("minLength")
  let uniqueItems = schema.get("uniqueItems")
  let maxItems = schema.get("maxItems")
  let minItems = schema.get("minItems")
  let pattern = schema.get("pattern")

  const schemaRequiresValue = requiredByParam || requiredBySchema === true
  const hasValue = value !== undefined && value !== null
  const isValidEmpty = !schemaRequiresValue && !hasValue

  const needsExplicitConstraintValidation = hasValue && type === "array"

  const requiresFurtherValidation =
    schemaRequiresValue
    || needsExplicitConstraintValidation
    || !isValidEmpty

  const isValidNullable = nullable && value === null

  // will not be included in the request or [schema / value] does not [allow / require] further analysis.
  const noFurtherValidationNeeded =
    isValidNullable
    || !type
    || !requiresFurtherValidation

  if(noFurtherValidationNeeded) {
    return []
  }

  // Further this point the parameter is considered worth to validate
  let stringCheck = type === "string" && value
  let arrayCheck = type === "array" && Array.isArray(value) && value.length
  let arrayListCheck = type === "array" && Im.List.isList(value) && value.count()
  let arrayStringCheck = type === "array" && typeof value === "string" && value
  let fileCheck = type === "file" && value instanceof win.File
  let booleanCheck = type === "boolean" && (value || value === false)
  let numberCheck = type === "number" && (value || value === 0)
  let integerCheck = type === "integer" && (value || value === 0)
  let objectCheck = type === "object" && typeof value === "object" && value !== null
  let objectStringCheck = type === "object" && typeof value === "string" && value

  const allChecks = [
    stringCheck, arrayCheck, arrayListCheck, arrayStringCheck, fileCheck,
    booleanCheck, numberCheck, integerCheck, objectCheck, objectStringCheck,
  ]

  const passedAnyCheck = allChecks.some(v => !!v)

  if (schemaRequiresValue && !passedAnyCheck && !bypassRequiredCheck) {
    errors.push("Required field is not provided")
    return errors
  }
  if (
    type === "object" &&
    (parameterContentMediaType === null ||
      parameterContentMediaType === "application/json")
  ) {
    let objectVal = value
    if(typeof value === "string") {
      try {
        objectVal = JSON.parse(value)
      } catch (e) {
        errors.push("Parameter string value must be valid JSON")
        return errors
      }
    }
    if(schema && schema.has("required") && isFunc(requiredBySchema.isList) && requiredBySchema.isList()) {
      requiredBySchema.forEach(key => {
        if(objectVal[key] === undefined) {
          errors.push({ propKey: key, error: "Required property not found" })
        }
      })
    }
    if(schema && schema.has("properties")) {
      schema.get("properties").forEach((val, key) => {
        const errs = validateValueBySchema(objectVal[key], val, false, bypassRequiredCheck, parameterContentMediaType)
        errors.push(...errs
          .map((error) => ({ propKey: key, error })))
      })
    }
  }

  if (pattern) {
    let err = validatePattern(value, pattern)
    if (err) errors.push(err)
  }

  if (minItems) {
    if (type === "array") {
      let err = validateMinItems(value, minItems)
      if (err) errors.push(err)
    }
  }

  if (maxItems) {
    if (type === "array") {
      let err = validateMaxItems(value, maxItems)
      if (err) errors.push({ needRemove: true, error: err })
    }
  }

  if (uniqueItems) {
    if (type === "array") {
      let errorPerItem = validateUniqueItems(value, uniqueItems)
      if (errorPerItem) errors.push(...errorPerItem)
    }
  }

  if (maxLength || maxLength === 0) {
    let err = validateMaxLength(value, maxLength)
    if (err) errors.push(err)
  }

  if (minLength) {
    let err = validateMinLength(value, minLength)
    if (err) errors.push(err)
  }

  if (maximum || maximum === 0) {
    let err = validateMaximum(value, maximum)
    if (err) errors.push(err)
  }

  if (minimum || minimum === 0) {
    let err = validateMinimum(value, minimum)
    if (err) errors.push(err)
  }

  if (type === "string") {
    let err
    if (format === "date-time") {
      err = validateDateTime(value)
    } else if (format === "uuid") {
      err = validateGuid(value)
    } else {
      err = validateString(value)
    }
    if (!err) return errors
    errors.push(err)
  } else if (type === "boolean") {
    let err = validateBoolean(value)
    if (!err) return errors
    errors.push(err)
  } else if (type === "number") {
    let err = validateNumber(value)
    if (!err) return errors
    errors.push(err)
  } else if (type === "integer") {
    let err = validateInteger(value)
    if (!err) return errors
    errors.push(err)
  } else if (type === "array") {
    if (!(arrayCheck || arrayListCheck)) {
      return errors
    }
    if(value) {
      value.forEach((item, i) => {
        const errs = validateValueBySchema(item, schema.get("items"), false, bypassRequiredCheck, parameterContentMediaType)
        errors.push(...errs
          .map((err) => ({ index: i, error: err })))
      })
    }
  } else if (type === "file") {
    let err = validateFile(value)
    if (!err) return errors
    errors.push(err)
  }

  return errors
}

// validation of parameters before execute
export const validateParam = (param, value, { isOAS3 = false, bypassRequiredCheck = false } = {}) => {

  let paramRequired = param.get("required")

  let { schema: paramDetails, parameterContentMediaType } = getParameterSchema(param, { isOAS3 })

  return validateValueBySchema(value, paramDetails, paramRequired, bypassRequiredCheck, parameterContentMediaType)
}

const getXmlSampleSchema = (schema, config, exampleOverride) => {
  if (schema && (!schema.xml || !schema.xml.name)) {
    schema.xml = schema.xml || {}

    if (schema.$$ref) {
      let match = schema.$$ref.match(/\S*\/(\S+)$/)
      schema.xml.name = match[1]
    } else if (schema.type || schema.items || schema.properties || schema.additionalProperties) {
      return "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!-- XML example cannot be generated; root element name is undefined -->"
    } else {
      return null
    }
  }
  return memoizedCreateXMLExample(schema, config, exampleOverride)
}

const shouldStringifyTypesConfig = [
  {
    when: /json/,
    shouldStringifyTypes: ["string"]
  }
]

const defaultStringifyTypes = ["object"]

const getStringifiedSampleForSchema = (schema, config, contentType, exampleOverride) => {
  const res = memoizedSampleFromSchema(schema, config, exampleOverride)
  const resType = typeof res

  const typesToStringify = shouldStringifyTypesConfig.reduce(
    (types, nextConfig) => nextConfig.when.test(contentType)
      ? [...types, ...nextConfig.shouldStringifyTypes]
      : types,
    defaultStringifyTypes)

  return some(typesToStringify, x => x === resType)
    ? JSON.stringify(res, null, 2)
    : res
}

const getYamlSampleSchema = (schema, config, contentType, exampleOverride) => {
  const jsonExample = getStringifiedSampleForSchema(schema, config, contentType, exampleOverride)
  let yamlString
  try {
    yamlString = YAML.dump(YAML.load(jsonExample), {

      lineWidth: -1 // don't generate line folds
    })
    if(yamlString[yamlString.length - 1] === "\n") {
      yamlString = yamlString.slice(0, yamlString.length - 1)
    }
  } catch (e) {
    console.error(e)
    return "error: could not generate yaml example"
  }
  return yamlString
    .replace(/\t/g, "  ")
}

export const getSampleSchema = (schema, contentType="", config={}, exampleOverride = undefined) => {
  if(schema && isFunc(schema.toJS))
    schema = schema.toJS()
  if(exampleOverride && isFunc(exampleOverride.toJS))
    exampleOverride = exampleOverride.toJS()

  if (/xml/.test(contentType)) {
    return getXmlSampleSchema(schema, config, exampleOverride)
  }
  if (/(yaml|yml)/.test(contentType)) {
    return getYamlSampleSchema(schema, config, contentType, exampleOverride)
  }
  return getStringifiedSampleForSchema(schema, config, contentType, exampleOverride)
}

export const parseSearch = () => {
  let map = {}
  let search = win.location.search

  if(!search)
    return {}

  if ( search != "" ) {
    let params = search.substr(1).split("&")

    for (let i in params) {
      if (!Object.prototype.hasOwnProperty.call(params, i)) {
        continue
      }
      i = params[i].split("=")
      map[decodeURIComponent(i[0])] = (i[1] && decodeURIComponent(i[1])) || ""
    }
  }

  return map
}

export const serializeSearch = (searchMap) => {
  return Object.keys(searchMap).map(k => {
    return encodeURIComponent(k) + "=" + encodeURIComponent(searchMap[k])
  }).join("&")
}

export const btoa = (str) => {
  let buffer

  if (str instanceof Buffer) {
    buffer = str
  } else {
    buffer = Buffer.from(str.toString(), "utf-8")
  }

  return buffer.toString("base64")
}

export const sorters = {
  operationsSorter: {
    alpha: (a, b) => a.get("path").localeCompare(b.get("path")),
    method: (a, b) => a.get("method").localeCompare(b.get("method"))
  },
  tagsSorter: {
    alpha: (a, b) => a.localeCompare(b)
  }
}

export const buildFormData = (data) => {
  let formArr = []

  for (let name in data) {
    let val = data[name]
    if (val !== undefined && val !== "") {
      formArr.push([name, "=", encodeURIComponent(val).replace(/%20/g,"+")].join(""))
    }
  }
  return formArr.join("&")
}

// Is this really required as a helper? Perhaps. TODO: expose the system of presets.apis in docs, so we know what is supported
export const shallowEqualKeys = (a,b, keys) => {
  return !!find(keys, (key) => {
    return eq(a[key], b[key])
  })
}

export function sanitizeUrl(url) {
  if(typeof url !== "string" || url === "") {
    return ""
  }

  return braintreeSanitizeUrl(url)
}

export function requiresValidationURL(uri) {
  if (!uri || uri.indexOf("localhost") >= 0 || uri.indexOf("127.0.0.1") >= 0 || uri === "none") {
    return false
  }
  return true
}


export function getAcceptControllingResponse(responses) {
  if(!Im.OrderedMap.isOrderedMap(responses)) {
    // wrong type!
    return null
  }

  if(!responses.size) {
    // responses is empty
    return null
  }

  const suitable2xxResponse = responses.find((res, k) => {
    return k.startsWith("2") && Object.keys(res.get("content") || {}).length > 0
  })

  // try to find a suitable `default` responses
  const defaultResponse = responses.get("default") || Im.OrderedMap()
  const defaultResponseMediaTypes = (defaultResponse.get("content") || Im.OrderedMap()).keySeq().toJS()
  const suitableDefaultResponse = defaultResponseMediaTypes.length ? defaultResponse : null

  return suitable2xxResponse || suitableDefaultResponse
}

// suitable for use in URL fragments
export const createDeepLinkPath = (str) => typeof str == "string" || str instanceof String ? str.trim().replace(/\s/g, "%20") : ""
// suitable for use in CSS classes and ids
export const escapeDeepLinkPath = (str) => cssEscape( createDeepLinkPath(str).replace(/%20/g, "_") )

export const getExtensions = (defObj) => defObj.filter((v, k) => /^x-/.test(k))
export const getCommonExtensions = (defObj) => defObj.filter((v, k) => /^pattern|maxLength|minLength|maximum|minimum/.test(k))

// Deeply strips a specific key from an object.
//
// `predicate` can be used to discriminate the stripping further,
// by preserving the key's place in the object based on its value.
export function deeplyStripKey(input, keyToStrip, predicate = () => true) {
  if(typeof input !== "object" || Array.isArray(input) || input === null || !keyToStrip) {
    return input
  }

  const obj = Object.assign({}, input)

  Object.keys(obj).forEach(k => {
    if(k === keyToStrip && predicate(obj[k], k)) {
      delete obj[k]
      return
    }
    obj[k] = deeplyStripKey(obj[k], keyToStrip, predicate)
  })

  return obj
}

export function stringify(thing) {
  if (typeof thing === "string") {
    return thing
  }

  if (thing && thing.toJS) {
    thing = thing.toJS()
  }

  if (typeof thing === "object" && thing !== null) {
    try {
      return JSON.stringify(thing, null, 2)
    }
    catch (e) {
      return String(thing)
    }
  }

  if(thing === null || thing === undefined) {
    return ""
  }

  return thing.toString()
}

export function numberToString(thing) {
  if(typeof thing === "number") {
    return thing.toString()
  }

  return thing
}

export function paramToIdentifier(param, { returnAll = false, allowHashes = true } = {}) {
  if(!Im.Map.isMap(param)) {
    throw new Error("paramToIdentifier: received a non-Im.Map parameter as input")
  }
  const paramName = param.get("name")
  const paramIn = param.get("in")

  let generatedIdentifiers = []

  // Generate identifiers in order of most to least specificity

  if (param && param.hashCode && paramIn && paramName && allowHashes) {
    generatedIdentifiers.push(`${paramIn}.${paramName}.hash-${param.hashCode()}`)
  }

  if(paramIn && paramName) {
    generatedIdentifiers.push(`${paramIn}.${paramName}`)
  }

  generatedIdentifiers.push(paramName)

  // Return the most preferred identifier, or all if requested

  return returnAll ? generatedIdentifiers : (generatedIdentifiers[0] || "")
}

export function paramToValue(param, paramValues) {
  const allIdentifiers = paramToIdentifier(param, { returnAll: true })

  // Map identifiers to values in the provided value hash, filter undefined values,
  // and return the first value found
  const values = allIdentifiers
    .map(id => {
      return paramValues[id]
    })
    .filter(value => value !== undefined)

  return values[0]
}

// adapted from https://auth0.com/docs/flows/guides/auth-code-pkce/includes/create-code-verifier
export function generateCodeVerifier() {
  return b64toB64UrlEncoded(
    randomBytes(32).toString("base64")
  )
}

export function createCodeChallenge(codeVerifier) {
  return b64toB64UrlEncoded(
      shaJs("sha256")
      .update(codeVerifier)
      .digest("base64")
    )
}

function b64toB64UrlEncoded(str) {
  return str
    .replace(/\+/g, "-")
    .replace(/\//g, "_")
    .replace(/=/g, "")
}

export const isEmptyValue = (value) => {
  if (!value) {
    return true
  }

  if (isImmutable(value) && value.isEmpty()) {
    return true
  }

  return false
}