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Validation, StringType, ArrayType, ObjectType, SimpleTypes,
isSimpleType, isArray, isEnum, isObj,
isMap, isNumber, isMeta, isString, ValueType, isTypeDefValidation, ValueTypes, isAnd, AndType, MapType
} from './validationTypes.js'
type InputTypes = any | string | number | object | void | boolean | null
export type ValidationOutputs= ValidationOutput|ValidationOutput[]
export type ValidationOutput =
| {[key: string]: ValidationOutputs}
| null
| {'error': string, output?: ValidationOutputs, value: any}
export type ValidationResult = {
'result': 'pass'|'fail'
output: ValidationOutputs
}
export type ValidationFailed = { message: string }
type SimpleValidation = string | null
type validateFn = (type: Validation, value: InputTypes) => ValidationResult
const failValidation = (error:string, value:any, output?: ValidationOutputs):ValidationResult => {
const content: ValidationOutputs = { error, value }
return {
result: 'fail',
output: output ? { ...content, output } : content
}
}
export const combineValidationObjects = <T>(type:AndType, customTypes:any, onError: (input:any)=>T)
:{result: 'error', error:T} | {pass: ObjectType, result? : void} => {
const resolveMeta = (tpe: Validation) : Validation => {
if (typeof tpe === 'string') { return resolveMeta(customTypes[tpe]) }
if (isMeta(tpe)) return resolveMeta(tpe.$type)
return tpe
}
const resolvedType = type.$and.map(x => resolveMeta(x))
if (resolvedType.some(x => !isObj(x))) {
return { error: onError(resolvedType), result: 'error' }
}
return {
pass: resolvedType.reduce((prev:any, current:any) => {
return { ...prev, ...current }
}, {})
}
}
const validateUndefined = (value: InputTypes): SimpleValidation =>
!(value === undefined) ? 'Value is not undefined' : null
const validateNull = (value: InputTypes): SimpleValidation =>
!(value === null) ? 'Value is not null' : null
const validateNumber = (value: InputTypes): SimpleValidation =>
!Number.isFinite(value) || typeof value !== 'number' ? 'Value is not a number' : null
const validateNumberComplex = (value: InputTypes, min?: number, max?: number): SimpleValidation => {
const res = validateNumber(value)
if (!res) {
if (min !== undefined && value < min) return 'Value is smaller than the required minimum'
if (max !== undefined && value > max) return 'Value is bigger than the required maximum'
}
return res
}
const validateInteger = (value: InputTypes): SimpleValidation =>
!Number.isSafeInteger(value) ? 'Value is not an integer ' : null
const validateString = (value: InputTypes, enums?: string[]): SimpleValidation => {
if (typeof value !== 'string') return 'Value is not a string'
else if (enums && enums.length && !enums.some(x => value === x)) { return `Value needs to be one of the following: [${enums.join(', ')}] ` }
return null
}
const validateStringObject = (value: InputTypes, validator: StringType): SimpleValidation => {
if (typeof value !== 'string') return 'Value is not a string'
if (validator.$string.minLength && value.length < validator.$string.minLength) { return 'String is shorter than the required minimum length' }
if (validator.$string.maxLength && value.length > validator.$string.maxLength) { return 'String is longer than the required maximum length' }
if (validator.$string.regex) {
const regex = new RegExp(validator.$string.regex, 'u')
if (!regex.test(value)) return 'String did not match required regex'
}
return null
}
const validateBool = (value: InputTypes): SimpleValidation =>
typeof value !== 'boolean' ? 'Value is not a boolean' : null
const validateOneOf = (value: InputTypes, validator: ValueType[], validate: validateFn):
ValidationResult => {
if (!validator.length) throw new Error('Array of types can not be empty')
const errors: ValidationOutput[] = []
for (const i of validator) {
const result = validate(i, value)
if (result.result === 'pass') return result
if (Array.isArray(result.output)) result.output.forEach(x => errors.push(x))
else errors.push(result.output)
}
return failValidation('Did not match any from the listed types', value, errors)
}
const validateArray = (value: InputTypes, validator: ArrayType, validate: validateFn):
ValidationResult => {
if (Array.isArray(value)) {
const maxLength = validator.maxLength || Number.MAX_SAFE_INTEGER
const minLength = validator.minLength || 0
if (value.length < minLength || value.length > maxLength) {
return failValidation(
`Array length needs to be between ${minLength} - ${maxLength}`,
value.length)
}
const resultArray: ValidationOutputs[] = []
let fail = false
for (const x of value) {
const res = validate(validator.$array, x)
if (res.result === 'fail') fail = true
resultArray.push(res.output)
}
return { result: fail ? 'fail' : 'pass', output: resultArray.flat() }
}
return failValidation('Value is not an Array', value)
}
const validateObject = (value: InputTypes, validator: ObjectType, validate: validateFn):
ValidationResult => {
if (typeof value !== 'object' || value === null || value === undefined) {
return failValidation('Value is not an Object', value)
}
let fail = false
const output: {[key: string]: ValidationOutputs} = {}
for (const key of Object.keys(value)) {
const validatorKey = key.startsWith('$') ? `\\${key}` : key
if (!validator[validatorKey]) {
fail = true
output[key] = { error: 'Key does not exist on validator', value: value[key] }
} else {
const { result, output: outputInternal } = validate(validator[validatorKey], value[key])
if (result === 'fail') fail = true
output[key] = outputInternal
}
}
for (const validatorKey of Object.keys(validator)) {
const key = validatorKey.startsWith('\\$') ? validatorKey.slice(1) : validatorKey
if (!Object.prototype.hasOwnProperty.call(output, key)) {
const { result, output: outputInternal } = validate(validator[validatorKey], value[key])
if (result === 'fail') fail = true
output[key] = outputInternal
}
}
return { result: fail ? 'fail' : 'pass', output }
}
const validateMap = (value: InputTypes, validator: MapType, validate: validateFn):
ValidationResult => {
if (typeof value !== 'object' || value === null || value === undefined) {
return failValidation('Value is not an Object', value)
}
let fail = false
const output: {[key: string]: ValidationOutputs} = {}
const keys = Object.keys(value)
const keyCount = keys.length
const maxLength = validator.maxLength || Number.MAX_SAFE_INTEGER
const minLength = validator.minLength || 0
if (keyCount < minLength || keyCount > maxLength) {
return failValidation(
`Map needs to have member count to be between ${minLength} - ${maxLength}`,
keyCount)
}
for (const key of keys) {
if (validator.regex) {
const regex = new RegExp(validator.regex, 'u')
if (!regex.test(key)) {
fail = true
output[key] = { error: 'String did not match required regex', value: value }
continue
}
}
const { result, output: outputInternal } = validate(validator.$map, value[key])
if (result === 'fail') fail = true
output[key] = outputInternal
}
return { result: fail ? 'fail' : 'pass', output }
}
const simpleValidation = (type: SimpleTypes, value: any): SimpleValidation => {
switch (type) {
case 'any': return null
case '?': return validateUndefined(value)
case 'number': return validateNumber(value)
case 'integer': return validateInteger(value)
case 'string': return validateString(value)
case 'boolean': return validateBool(value)
case 'null': return validateNull(value)
default: throw new Error(`Unknown validator:${JSON.stringify(type)}`)
}
}
const toResult = (res: SimpleValidation, value: InputTypes): ValidationResult =>
({ result: res ? 'fail' : 'pass', output: res ? { error: res, value } : null })
const validateInternal = (typeIn: Validation, value: InputTypes, customTypesIn: {[key:string] : ValueTypes}): ValidationResult => {
if (typeof typeIn === 'undefined') throw new Error('Type for validation cannot be undefined')
let type: ValueTypes = typeIn
let customTypes: {[key:string] : ValueTypes} = customTypesIn
if (isTypeDefValidation(typeIn)) {
customTypes = typeIn.$types
type = { ...typeIn }
delete type.$types
}
const validateCustom :validateFn = (type:Validation, value:any) => validateInternal(type, value, customTypes)
if (isSimpleType(type)) {
if (customTypes[type]) {
return validateCustom(customTypes[type], value)
}
return toResult(simpleValidation(type, value), value)
}
if (Array.isArray(type)) { return validateOneOf(value, type, validateCustom) }
if (isArray(type)) { return validateArray(value, type, validateCustom) }
if (isEnum(type)) { return toResult(validateString(value, type.$enum), value) }
if (isObj(type)) { return validateObject(value, type, validateCustom) }
if (isMap(type)) { return validateMap(value, type, validateCustom) }
if (isNumber(type)) { return toResult(validateNumberComplex(value, type.$number.min, type.$number.max), value) }
if (isMeta(type)) { return validateCustom(type.$type, value) }
if (isString(type)) { return toResult(validateStringObject(value, type), value) }
if (isAnd(type)) {
const onError = (resolvedType: any):ValidationResult =>
failValidation('SCHEMA error: $and must only contain objects', resolvedType)
const combined = combineValidationObjects(type, customTypes, onError)
if (combined.result === 'error') return combined.error
return validateObject(value, combined.pass, validateCustom)
}
throw new Error(`Unknown validator:${JSON.stringify(type)}`)
}
export const validate = (type: Validation, value: InputTypes): ValidationResult => {
return validateInternal(type, value, {})
}
export const loadJson = (json: string | object): Validation => {
const jsonOut: any = typeof json === 'string' ? JSON.parse(json) : json
delete jsonOut.$schema
return jsonOut
}
|