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| const swagger = require('swagger-server')
const swaggerParser = require('swagger-parser')
const XorShift = require('xorshift').constructor
const range = require('array-range')
const crypto = require('crypto')
const glob = require('glob')
function seedFrom(str) {
return crypto.createHash('sha256').update(str, 'utf8').digest('hex')
}
function getRandomizer(seed) {
const a = parseInt(seed.slice(0, 16), 16)
const b = parseInt(seed.slice(16, 32), 16)
const c = parseInt(seed.slice(32, 48), 16)
const d = parseInt(seed.slice(48, 64), 16)
return new XorShift([a, b, c, d])
}
const syll = 'na,ni,no,ma,mi,my,de,ba,be,bu,ko,ke,so,sy,ru,ra,re,wo,wu,fe,fo,fi'.split(',')
function fakeWord(rnd, scount) {
const sc = scount || 1 + Math.floor(rnd.random() * 4)
const w = range(sc).map(() => syll[Math.floor(rnd.random() * syll.length)]).join('')
return w[0].toUpperCase() + w.slice(1).toLowerCase()
}
const types = 'red,yellow,blue,green,pink'.split(',')
function fakeType(rnd) {
return types[Math.floor(rnd.random() * types.length)]
}
function fakeId(rnd) {
return `id${Math.floor(rnd.random() * 1e12).toString(36).toUpperCase()}`
}
function fakeTitle(rnd) {
const wc = 2 + Math.floor(rnd.random() * 5)
return range(wc).map(() => fakeWord(rnd)).join(' ')
}
function fakeParagraph(rnd, minLines = 1, maxLines = 4) {
const sc = minLines + Math.floor(rnd.random() * maxLines)
const wc = 2 + Math.floor(rnd.random() * 7)
const paragraph = range(sc).map(() => {
const sent = range(wc).map(() => fakeWord(rnd)).join(' ')
return sent[0].toUpperCase() + sent.slice(1).toLowerCase()
}).join('. ')
return `${paragraph}.`
}
function fakePath(rnd) {
const wc = 1 + Math.floor(rnd.random() * 5)
const path = range(wc).map(() => fakeWord(rnd).toLowerCase())
return `/${path.join('/')}/`
}
function fakeSlug(rnd) {
return fakeTitle(rnd).toLowerCase().split(' ').join('-')
}
function fakeString(rnd, name, stack) {
let r = ''
if (/(?:id)$/i.test(name)) {
r = fakeId(rnd)
}
else if (/(?:slug|name)$/i.test(name)) {
r = fakeSlug(rnd)
}
else if (/(?:type)$/i.test(name)) {
r = fakeType(rnd)
}
else if (/(?:title)$/i.test(name)) {
r = fakeTitle(rnd)
}
else if (/(?:path|pathname)$/i.test(name)) {
r = fakePath(rnd)
}
else if (/(?:url|uri)$/i.test(name)) {
if (/\b(media|img|image)\b/i.test(stack.join(','))) {
const w = 700 + Math.floor(rnd.random() * 4) * 100
const h = 700 + Math.floor(rnd.random() * 4) * 100
r = `https://placekitten.com/${w}/${h}`
}
else {
r = `//localhost${fakePath(rnd)}`
}
}
else if (/(?:alt|summary)$/i.test(name)) {
r = fakeParagraph(rnd, 1, 2)
}
else {
r = fakeParagraph(rnd, 3, 10)
}
return r
}
function fakeObject(rnd, schema, stack = []) {
const ret = {}
const fields = schema.required || []
fields.forEach((key) => {
const field = schema.properties[key]
if (field.type === 'array') {
// N many items should generate (this can be min/maxed by params)
ret[key] = range(1 + Math.floor(rnd.random() * 4)).map(() => fakeObject(rnd, field.items, stack.concat([key])))
}
else if (!field.type || field.type === 'object') {
const obj = fakeObject(rnd, field, stack.concat([key]))
ret[key] = obj
if (field.additionalProperties) {
range(1 + Math.floor(rnd.random() * 3)).map(() => (
obj[fakeId(rnd)] = fakeObject(rnd, field.additionalProperties, stack.concat([key]))
))
}
}
else if (field.type === 'string') {
ret[key] = fakeString(rnd, key, stack.concat([key]))
}
else {
console.error(`Encountered unsupported field type: ${field.type}`)
}
})
return ret
}
module.exports = function (contractsFolder) {
const server = new swagger.Server()
glob.sync(`${contractsFolder}/**/*.yml`).forEach(contractFileName => {
server.parse(contractFileName)
swaggerParser.validate(contractFileName)
.then(api => {
for (const pathKey in api.paths) {
Eif ({}.hasOwnProperty.call(api.paths, pathKey)) {
const apiMethod = api.paths[pathKey]
for (const method in apiMethod) {
Eif ({}.hasOwnProperty.call(apiMethod, method)) {
server[method](api.basePath + pathKey, (req, res) => {
// use a consistent seed throughout the response to ensure deterministic responses
const seed = seedFrom(req.url)
res.header('X-FakeAPI-seed', seed)
const apiRes = apiMethod[method].responses[200]
// fabricate headers
const headRand = getRandomizer(seed)
for (const header in apiRes.headers) {
if ({}.hasOwnProperty.call(apiRes.headers, header)) {
const headerval = fakeString(headRand, header)
res.header(header, headerval)
}
}
// fabricate headers
const bodyRand = getRandomizer(seed)
const body = fakeObject(bodyRand, apiRes.schema, [pathKey])
res.send(body)
})
}
}
}
}
})
.catch((err) => console.error(`Onoes! The API is invalid. ${err.message}`))
})
return server
}
|