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index.js
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'use strict'
/* eslint no-prototype-builtins: 0 */
const Ajv = require('ajv')
const merge = require('deepmerge')
const clone = require('rfdc')({ proto: true })
const fjsCloned = Symbol('fast-json-stringify.cloned')
const validate = require('./schema-validator')
let stringSimilarity = null
let isLong
try {
isLong = require('long').isLong
} catch (e) {
isLong = null
}
const addComma = `
if (addComma) {
json += ','
} else {
addComma = true
}
`
function isValidSchema (schema, name) {
if (!validate(schema)) {
if (name) {
name = `"${name}" `
} else {
name = ''
}
const first = validate.errors[0]
const err = new Error(`${name}schema is invalid: data${first.dataPath} ${first.message}`)
err.errors = isValidSchema.errors
throw err
}
}
function mergeLocation (source, dest) {
return {
schema: dest.schema || source.schema,
root: dest.root || source.root,
externalSchema: dest.externalSchema || source.externalSchema
}
}
function build (schema, options) {
options = options || {}
isValidSchema(schema)
if (options.schema) {
// eslint-disable-next-line
for (var key of Object.keys(options.schema)) {
isValidSchema(options.schema[key], key)
}
}
let intParseFunctionName = 'trunc'
if (options.rounding) {
if (['floor', 'ceil', 'round'].includes(options.rounding)) {
intParseFunctionName = options.rounding
} else {
throw new Error(`Unsupported integer rounding method ${options.rounding}`)
}
}
/* eslint no-new-func: "off" */
let code = `
'use strict'
`
code += `
${$pad2Zeros.toString()}
${$asAny.toString()}
${$asString.toString()}
${$asStringNullable.toString()}
${$asStringSmall.toString()}
${$asDatetime.toString()}
${$asDate.toString()}
${$asTime.toString()}
${$asNumber.toString()}
${$asNumberNullable.toString()}
${$asInteger.toString()}
${$asIntegerNullable.toString()}
${$asNull.toString()}
${$asBoolean.toString()}
${$asBooleanNullable.toString()}
var isLong = ${isLong ? isLong.toString() : false}
function parseInteger(int) { return Math.${intParseFunctionName}(int) }
`
let location = {
schema,
root: schema,
externalSchema: options.schema
}
if (schema.$ref) {
location = refFinder(schema.$ref, location)
schema = location.schema
}
if (schema.type === undefined) {
schema.type = inferTypeByKeyword(schema)
}
let main
switch (schema.type) {
case 'object':
main = '$main'
code = buildObject(location, code, main)
break
case 'string':
main = schema.nullable ? $asStringNullable.name : getStringSerializer(schema.format)
break
case 'integer':
main = schema.nullable ? $asIntegerNullable.name : $asInteger.name
break
case 'number':
main = schema.nullable ? $asNumberNullable.name : $asNumber.name
break
case 'boolean':
main = schema.nullable ? $asBooleanNullable.name : $asBoolean.name
break
case 'null':
main = $asNull.name
break
case 'array':
main = '$main'
code = buildArray(location, code, main)
schema = location.schema
break
case undefined:
main = '$asAny'
break
default:
throw new Error(`${schema.type} unsupported`)
}
code += `
;
return ${main}
`
const dependencies = [new Ajv(options.ajv)]
const dependenciesName = ['ajv']
dependenciesName.push(code)
if (options.debugMode) {
dependenciesName.toString = function () {
return dependenciesName.join('\n')
}
return dependenciesName
}
return (Function.apply(null, dependenciesName).apply(null, dependencies))
}
const objectKeywords = [
'maxProperties',
'minProperties',
'required',
'properties',
'patternProperties',
'additionalProperties',
'dependencies'
]
const arrayKeywords = [
'items',
'additionalItems',
'maxItems',
'minItems',
'uniqueItems',
'contains'
]
const stringKeywords = [
'maxLength',
'minLength',
'pattern'
]
const numberKeywords = [
'multipleOf',
'maximum',
'exclusiveMaximum',
'minimum',
'exclusiveMinimum'
]
/**
* Infer type based on keyword in order to generate optimized code
* https://json-schema.org/latest/json-schema-validation.html#rfc.section.6
*/
function inferTypeByKeyword (schema) {
// eslint-disable-next-line
for (var keyword of objectKeywords) {
if (keyword in schema) return 'object'
}
// eslint-disable-next-line
for (var keyword of arrayKeywords) {
if (keyword in schema) return 'array'
}
// eslint-disable-next-line
for (var keyword of stringKeywords) {
if (keyword in schema) return 'string'
}
// eslint-disable-next-line
for (var keyword of numberKeywords) {
if (keyword in schema) return 'number'
}
return schema.type
}
const stringSerializerMap = {
'date-time': '$asDatetime',
date: '$asDate',
time: '$asTime'
}
function getStringSerializer (format) {
return stringSerializerMap[format] ||
'$asString'
}
function getTestSerializer (format) {
return stringSerializerMap[format]
}
function $pad2Zeros (num) {
const s = '00' + num
return s[s.length - 2] + s[s.length - 1]
}
function $asAny (i) {
return JSON.stringify(i)
}
function $asNull () {
return 'null'
}
function $asInteger (i) {
if (isLong && isLong(i)) {
return i.toString()
} else if (typeof i === 'bigint') {
return i.toString()
} else if (Number.isInteger(i)) {
return $asNumber(i)
} else {
/* eslint no-undef: "off" */
return $asNumber(parseInteger(i))
}
}
function $asIntegerNullable (i) {
return i === null ? null : $asInteger(i)
}
function $asNumber (i) {
const num = Number(i)
if (isNaN(num)) {
return 'null'
} else {
return '' + num
}
}
function $asNumberNullable (i) {
return i === null ? null : $asNumber(i)
}
function $asBoolean (bool) {
return bool && 'true' || 'false' // eslint-disable-line
}
function $asBooleanNullable (bool) {
return bool === null ? null : $asBoolean(bool)
}
function $asDatetime (date, skipQuotes) {
const quotes = skipQuotes === true ? '' : '"'
if (date instanceof Date) {
return quotes + date.toISOString() + quotes
} else if (date && typeof date.toISOString === 'function') {
return quotes + date.toISOString() + quotes
} else {
return $asString(date, skipQuotes)
}
}
function $asDate (date, skipQuotes) {
const quotes = skipQuotes === true ? '' : '"'
if (date instanceof Date) {
const year = new Intl.DateTimeFormat('en', { year: 'numeric' }).format(date)
const month = new Intl.DateTimeFormat('en', { month: '2-digit' }).format(date)
const day = new Intl.DateTimeFormat('en', { day: '2-digit' }).format(date)
return quotes + year + '-' + month + '-' + day + quotes
} else if (date && typeof date.format === 'function') {
return quotes + date.format('YYYY-MM-DD') + quotes
} else {
return $asString(date, skipQuotes)
}
}
function $asTime (date, skipQuotes) {
const quotes = skipQuotes === true ? '' : '"'
if (date instanceof Date) {
const hour = new Intl.DateTimeFormat('en', { hour: 'numeric', hour12: false }).format(date)
const minute = new Intl.DateTimeFormat('en', { minute: 'numeric' }).format(date)
const second = new Intl.DateTimeFormat('en', { second: 'numeric' }).format(date)
return quotes + $pad2Zeros(hour) + ':' + $pad2Zeros(minute) + ':' + $pad2Zeros(second) + quotes
} else if (date && typeof date.format === 'function') {
return quotes + date.format('HH:mm:ss') + quotes
} else {
return $asString(date, skipQuotes)
}
}
function $asString (str, skipQuotes) {
const quotes = skipQuotes === true ? '' : '"'
if (str instanceof Date) {
return quotes + str.toISOString() + quotes
} else if (str === null) {
return quotes + quotes
} else if (str instanceof RegExp) {
str = str.source
} else if (typeof str !== 'string') {
str = str.toString()
}
// If we skipQuotes it means that we are using it as test
// no need to test the string length for the render
if (skipQuotes) {
return str
}
if (str.length < 42) {
return $asStringSmall(str)
} else {
return JSON.stringify(str)
}
}
function $asStringNullable (str) {
return str === null ? null : $asString(str)
}
// magically escape strings for json
// relying on their charCodeAt
// everything below 32 needs JSON.stringify()
// every string that contain surrogate needs JSON.stringify()
// 34 and 92 happens all the time, so we
// have a fast case for them
function $asStringSmall (str) {
const l = str.length
let result = ''
let last = 0
let found = false
let surrogateFound = false
let point = 255
// eslint-disable-next-line
for (var i = 0; i < l && point >= 32; i++) {
point = str.charCodeAt(i)
if (point >= 0xD800 && point <= 0xDFFF) {
// The current character is a surrogate.
surrogateFound = true
}
if (point === 34 || point === 92) {
result += str.slice(last, i) + '\\'
last = i
found = true
}
}
if (!found) {
result = str
} else {
result += str.slice(last)
}
return ((point < 32) || (surrogateFound === true)) ? JSON.stringify(str) : '"' + result + '"'
}
function addPatternProperties (location) {
const schema = location.schema
const pp = schema.patternProperties
let code = `
var properties = ${JSON.stringify(schema.properties)} || {}
var keys = Object.keys(obj)
for (var i = 0; i < keys.length; i++) {
if (properties[keys[i]]) continue
`
Object.keys(pp).forEach((regex, index) => {
let ppLocation = mergeLocation(location, { schema: pp[regex] })
if (pp[regex].$ref) {
ppLocation = refFinder(pp[regex].$ref, location)
pp[regex] = ppLocation.schema
}
const type = pp[regex].type
const format = pp[regex].format
const stringSerializer = getStringSerializer(format)
try {
RegExp(regex)
} catch (err) {
throw new Error(`${err.message}. Found at ${regex} matching ${JSON.stringify(pp[regex])}`)
}
code += `
if (/${regex.replace(/\\*\//g, '\\/')}/.test(keys[i])) {
`
if (type === 'object') {
code += `${buildObject(ppLocation, '', 'buildObjectPP' + index)}
${addComma}
json += $asString(keys[i]) + ':' + buildObjectPP${index}(obj[keys[i]])
`
} else if (type === 'array') {
code += `${buildArray(ppLocation, '', 'buildArrayPP' + index)}
${addComma}
json += $asString(keys[i]) + ':' + buildArrayPP${index}(obj[keys[i]])
`
} else if (type === 'null') {
code += `
${addComma}
json += $asString(keys[i]) +':null'
`
} else if (type === 'string') {
code += `
${addComma}
json += $asString(keys[i]) + ':' + ${stringSerializer}(obj[keys[i]])
`
} else if (type === 'integer') {
code += `
${addComma}
json += $asString(keys[i]) + ':' + $asInteger(obj[keys[i]])
`
} else if (type === 'number') {
code += `
${addComma}
json += $asString(keys[i]) + ':' + $asNumber(obj[keys[i]])
`
} else if (type === 'boolean') {
code += `
${addComma}
json += $asString(keys[i]) + ':' + $asBoolean(obj[keys[i]])
`
} else if (type === undefined) {
code += `
${addComma}
json += $asString(keys[i]) + ':' + $asAny(obj[keys[i]])
`
} else {
code += `
throw new Error('Cannot coerce ' + obj[keys[i]] + ' to ' + ${JSON.stringify(type)})
`
}
code += `
continue
}
`
})
if (schema.additionalProperties) {
code += additionalProperty(location)
}
code += `
}
`
return code
}
function additionalProperty (location) {
let ap = location.schema.additionalProperties
let code = ''
if (ap === true) {
return `
if (obj[keys[i]] !== undefined && typeof obj[keys[i]] !== 'function' && typeof obj[keys[i]] !== 'symbol') {
${addComma}
json += $asString(keys[i]) + ':' + JSON.stringify(obj[keys[i]])
}
`
}
let apLocation = mergeLocation(location, { schema: ap })
if (ap.$ref) {
apLocation = refFinder(ap.$ref, location)
ap = apLocation.schema
}
const type = ap.type
const format = ap.format
const stringSerializer = getStringSerializer(format)
if (type === 'object') {
code += `${buildObject(apLocation, '', 'buildObjectAP')}
${addComma}
json += $asString(keys[i]) + ':' + buildObjectAP(obj[keys[i]])
`
} else if (type === 'array') {
code += `${buildArray(apLocation, '', 'buildArrayAP')}
${addComma}
json += $asString(keys[i]) + ':' + buildArrayAP(obj[keys[i]])
`
} else if (type === 'null') {
code += `
${addComma}
json += $asString(keys[i]) +':null'
`
} else if (type === 'string') {
code += `
${addComma}
json += $asString(keys[i]) + ':' + ${stringSerializer}(obj[keys[i]])
`
} else if (type === 'integer') {
code += `
var t = Number(obj[keys[i]])
`
if (isLong) {
code += `
if (isLong(obj[keys[i]]) || !isNaN(t)) {
${addComma}
json += $asString(keys[i]) + ':' + $asInteger(obj[keys[i]])
}
`
} else {
code += `
if (!isNaN(t)) {
${addComma}
json += $asString(keys[i]) + ':' + t
}
`
}
} else if (type === 'number') {
code += `
var t = Number(obj[keys[i]])
if (!isNaN(t)) {
${addComma}
json += $asString(keys[i]) + ':' + t
}
`
} else if (type === 'boolean') {
code += `
${addComma}
json += $asString(keys[i]) + ':' + $asBoolean(obj[keys[i]])
`
} else if (type === undefined) {
code += `
${addComma}
json += $asString(keys[i]) + ':' + $asAny(obj[keys[i]])
`
} else {
code += `
throw new Error('Cannot coerce ' + obj[keys[i]] + ' to ' + ${JSON.stringify(type)})
`
}
return code
}
function addAdditionalProperties (location) {
return `
var properties = ${JSON.stringify(location.schema.properties)} || {}
var keys = Object.keys(obj)
for (var i = 0; i < keys.length; i++) {
if (properties[keys[i]]) continue
${additionalProperty(location)}
}
`
}
function idFinder (schema, searchedId) {
let objSchema
const explore = (schema, searchedId) => {
Object.keys(schema || {}).forEach((key, i, a) => {
if (key === '$id' && schema[key] === searchedId) {
objSchema = schema
} else if (objSchema === undefined && typeof schema[key] === 'object') {
explore(schema[key], searchedId)
}
})
}
explore(schema, searchedId)
return objSchema
}
function refFinder (ref, location) {
const externalSchema = location.externalSchema
let root = location.root
let schema = location.schema
if (externalSchema && externalSchema[ref]) {
return {
schema: externalSchema[ref],
root: externalSchema[ref],
externalSchema: externalSchema
}
}
// Split file from walk
ref = ref.split('#')
// If external file
if (ref[0]) {
schema = externalSchema[ref[0]]
root = externalSchema[ref[0]]
if (schema === undefined) {
findBadKey(externalSchema, [ref[0]])
}
if (schema.$ref) {
return refFinder(schema.$ref, {
schema: schema,
root: root,
externalSchema: externalSchema
})
}
}
let code = 'return schema'
// If it has a path
if (ref[1]) {
// ref[1] could contain a JSON pointer - ex: /definitions/num
// or plain name fragment id without suffix # - ex: customId
const walk = ref[1].split('/')
if (walk.length === 1) {
const targetId = `#${ref[1]}`
let dereferenced = idFinder(schema, targetId)
if (dereferenced === undefined && !ref[0]) {
// eslint-disable-next-line
for (var key of Object.keys(externalSchema)) {
dereferenced = idFinder(externalSchema[key], targetId)
if (dereferenced !== undefined) {
root = externalSchema[key]
break
}
}
}
return {
schema: dereferenced,
root: root,
externalSchema: externalSchema
}
} else {
// eslint-disable-next-line
for (var i = 1; i < walk.length; i++) {
code += `[${JSON.stringify(walk[i])}]`
}
}
}
let result
try {
result = (new Function('schema', code))(root)
} catch (err) {}
if (result === undefined && ref[1]) {
const walk = ref[1].split('/')
findBadKey(schema, walk.slice(1))
}
if (result.$ref) {
return refFinder(result.$ref, {
schema: schema,
root: root,
externalSchema: externalSchema
})
}
return {
schema: result,
root: root,
externalSchema: externalSchema
}
function findBadKey (obj, keys) {
if (keys.length === 0) return null
const key = keys.shift()
if (obj[key] === undefined) {
stringSimilarity = stringSimilarity || require('string-similarity')
const { bestMatch } = stringSimilarity.findBestMatch(key, Object.keys(obj))
if (bestMatch.rating >= 0.5) {
throw new Error(`Cannot find reference ${JSON.stringify(key)}, did you mean ${JSON.stringify(bestMatch.target)}?`)
} else {
throw new Error(`Cannot find reference ${JSON.stringify(key)}`)
}
}
return findBadKey(obj[key], keys)
}
}
function buildCode (location, code, laterCode, name) {
if (location.schema.$ref) {
location = refFinder(location.schema.$ref, location)
}
const schema = location.schema
let required = schema.required
Object.keys(schema.properties || {}).forEach((key, i, a) => {
let propertyLocation = mergeLocation(location, { schema: schema.properties[key] })
if (schema.properties[key].$ref) {
propertyLocation = refFinder(schema.properties[key].$ref, location)
schema.properties[key] = propertyLocation.schema
}
// Using obj['key'] !== undefined instead of obj.hasOwnProperty(prop) for perf reasons,
// see https://github.com/mcollina/fast-json-stringify/pull/3 for discussion.
const type = schema.properties[key].type
const nullable = schema.properties[key].nullable
const sanitized = JSON.stringify(key)
const asString = JSON.stringify(sanitized)
if (nullable) {
code += `
if (obj[${sanitized}] === null) {
${addComma}
json += ${asString} + ':null'
var rendered = true
} else {
`
}
if (type === 'number') {
code += `
var t = Number(obj[${sanitized}])
if (!isNaN(t)) {
${addComma}
json += ${asString} + ':' + t
`
} else if (type === 'integer') {
code += `
var rendered = false
`
if (isLong) {
code += `
if (isLong(obj[${sanitized}])) {
${addComma}
json += ${asString} + ':' + obj[${sanitized}].toString()
rendered = true
} else {
var t = Number(obj[${sanitized}])
if (!isNaN(t)) {
${addComma}
json += ${asString} + ':' + t
rendered = true
}
}
`
} else {
code += `
var t = $asInteger(obj[${sanitized}])
if (!isNaN(t)) {
${addComma}
json += ${asString} + ':' + t
rendered = true
}
`
}
code += `
if (rendered) {
`
} else {
code += `
if (obj[${sanitized}] !== undefined) {
${addComma}
json += ${asString} + ':'
`
const result = nested(laterCode, name, key, mergeLocation(propertyLocation, { schema: schema.properties[key] }), undefined, false)
code += result.code
laterCode = result.laterCode
}
const defaultValue = schema.properties[key].default
if (defaultValue !== undefined) {
required = filterRequired(required, key)
code += `
} else {
${addComma}
json += ${asString} + ':' + ${JSON.stringify(JSON.stringify(defaultValue))}
`
} else if (required && required.indexOf(key) !== -1) {
required = filterRequired(required, key)
code += `
} else {
throw new Error('${sanitized} is required!')
`
}
code += `
}
`
if (nullable) {
code += `
}
`
}
})
if (required && required.length > 0) {
code += 'var required = ['
// eslint-disable-next-line
for (var i = 0; i < required.length; i++) {
if (i > 0) {
code += ','
}
code += `${JSON.stringify(required[i])}`
}
code += `]
for (var i = 0; i < required.length; i++) {
if (obj[required[i]] === undefined) throw new Error('"' + required[i] + '" is required!')
}
`
}
return { code: code, laterCode: laterCode }
}
function filterRequired (required, key) {
if (!required) {
return required
}
return required.filter(k => k !== key)
}
function buildCodeWithAllOfs (location, code, laterCode, name) {
if (location.schema.allOf) {
location.schema.allOf.forEach((ss) => {
const builtCode = buildCodeWithAllOfs(mergeLocation(location, { schema: ss }), code, laterCode, name)
code = builtCode.code
laterCode = builtCode.laterCode
})
} else {
const builtCode = buildCode(location, code, laterCode, name)
code = builtCode.code
laterCode = builtCode.laterCode
}
return { code: code, laterCode: laterCode }
}
function buildInnerObject (location, name) {
const schema = location.schema
const result = buildCodeWithAllOfs(location, '', '', name)
if (schema.patternProperties) {
result.code += addPatternProperties(location)
} else if (schema.additionalProperties && !schema.patternProperties) {
result.code += addAdditionalProperties(location)
}
return result
}
function addIfThenElse (location, name) {
let code = ''
let r
let laterCode = ''
let innerR
const schema = location.schema
const copy = merge({}, schema)
const i = copy.if
const then = copy.then
const e = copy.else ? copy.else : { additionalProperties: true }
delete copy.if
delete copy.then
delete copy.else
let merged = merge(copy, then)
let mergedLocation = mergeLocation(location, { schema: merged })
code += `
valid = ajv.validate(${JSON.stringify(i)}, obj)
if (valid) {
`
if (merged.if && merged.then) {
innerR = addIfThenElse(mergedLocation, name + 'Then')
code += innerR.code
laterCode = innerR.laterCode
}
r = buildInnerObject(mergedLocation, name + 'Then')
code += r.code
laterCode += r.laterCode
code += `
}
`
merged = merge(copy, e)
mergedLocation = mergeLocation(mergedLocation, { schema: merged })
code += `
else {
`
if (merged.if && merged.then) {
innerR = addIfThenElse(mergedLocation, name + 'Else')
code += innerR.code
laterCode += innerR.laterCode
}
r = buildInnerObject(mergedLocation, name + 'Else')
code += r.code
laterCode += r.laterCode
code += `
}
`
return { code: code, laterCode: laterCode }
}
function toJSON (variableName) {
return `(${variableName} && typeof ${variableName}.toJSON === 'function')
? ${variableName}.toJSON()
: ${variableName}
`
}
function buildObject (location, code, name) {
const schema = location.schema
code += `
function ${name} (input) {
`
if (schema.nullable) {
code += `
if(input === null) {
return '${$asNull()}';
}
`
}
code += `
var obj = ${toJSON('input')}
var json = '{'
var addComma = false
`
let r
if (schema.if && schema.then) {
code += `
var valid
`
r = addIfThenElse(location, name)
} else {
r = buildInnerObject(location, name)
}
// Removes the comma if is the last element of the string (in case there are not properties)
code += `${r.code}
json += '}'
return json
}
${r.laterCode}
`
return code
}
function buildArray (location, code, name, key = null) {
let schema = location.schema
code += `
function ${name} (obj) {
`
if (schema.nullable) {
code += `
if(obj === null) {
return '${$asNull()}';
}
`
}
code += `
var json = '['
`
const laterCode = ''
// default to any items type
if (!schema.items) {
schema.items = {}
}
if (schema.items.$ref) {
if (!schema[fjsCloned]) {
location.schema = clone(location.schema)
schema = location.schema
schema[fjsCloned] = true
}
location = refFinder(schema.items.$ref, location)
schema.items = location.schema
}
let result = { code: '', laterCode: '' }
const accessor = '[i]'
if (Array.isArray(schema.items)) {
result = schema.items.reduce((res, item, i) => {
const tmpRes = nested(laterCode, name, accessor, mergeLocation(location, { schema: item }), i, true)
const condition = `i === ${i} && ${buildArrayTypeCondition(item.type, accessor)}`
return {