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index.test.ts
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index.test.ts
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/* eslint-env jest */
import { join } from 'path'
import cheerio from 'cheerio'
import webdriver from 'next-webdriver'
import { NextInstance } from 'test/lib/next-modes/base'
import { check, fetchViaHTTP } from 'next-test-utils'
import { createNext, FileRef } from 'e2e-utils'
import escapeStringRegexp from 'escape-string-regexp'
describe('Middleware Rewrite', () => {
let next: NextInstance
afterAll(() => next.destroy())
beforeAll(async () => {
next = await createNext({
files: {
pages: new FileRef(join(__dirname, '../app/pages')),
'next.config.js': new FileRef(join(__dirname, '../app/next.config.js')),
'middleware.js': new FileRef(join(__dirname, '../app/middleware.js')),
},
})
})
tests()
testsWithLocale()
testsWithLocale('/fr')
function tests() {
// TODO: middleware effect headers aren't available here
it.skip('includes the locale in rewrites by default', async () => {
const res = await fetchViaHTTP(next.url, `/rewrite-me-to-about`)
expect(
res.headers.get('x-middleware-rewrite')?.endsWith('/en/about')
).toEqual(true)
})
it('should rewrite correctly when navigating via history', async () => {
const browser = await webdriver(next.url, '/')
await browser.elementByCss('#override-with-internal-rewrite').click()
await check(() => {
return browser.eval('document.documentElement.innerHTML')
}, /Welcome Page A/)
await browser.refresh()
await browser.back()
await browser.waitForElementByCss('#override-with-internal-rewrite')
await browser.forward()
await check(() => {
return browser.eval('document.documentElement.innerHTML')
}, /Welcome Page A/)
})
it('should rewrite correctly when navigating via history after query update', async () => {
const browser = await webdriver(next.url, '/')
await browser.elementByCss('#override-with-internal-rewrite').click()
await check(() => {
return browser.eval('document.documentElement.innerHTML')
}, /Welcome Page A/)
await browser.refresh()
await browser.waitForCondition(`!!window.next.router.isReady`)
await browser.back()
await browser.waitForElementByCss('#override-with-internal-rewrite')
await browser.forward()
await check(() => {
return browser.eval('document.documentElement.innerHTML')
}, /Welcome Page A/)
})
it('should return HTML/data correctly for pre-rendered page', async () => {
for (const slug of [
'first',
'build-time-1',
'build-time-2',
'build-time-3',
]) {
const res = await fetchViaHTTP(next.url, `/fallback-true-blog/${slug}`)
expect(res.status).toBe(200)
const $ = cheerio.load(await res.text())
expect(JSON.parse($('#props').text())?.params).toEqual({
slug,
})
const dataRes = await fetchViaHTTP(
next.url,
`/_next/data/${next.buildId}/en/fallback-true-blog/${slug}.json`,
undefined,
{
headers: {
'x-nextjs-data': '1',
},
}
)
expect(dataRes.status).toBe(200)
expect((await dataRes.json())?.pageProps?.params).toEqual({
slug,
})
}
})
it('should override with rewrite internally correctly', async () => {
const res = await fetchViaHTTP(
next.url,
`/about`,
{ override: 'internal' },
{ redirect: 'manual' }
)
expect(res.status).toBe(200)
expect(await res.text()).toContain('Welcome Page A')
const browser = await webdriver(next.url, ``)
await browser.elementByCss('#override-with-internal-rewrite').click()
await check(
() => browser.eval('document.documentElement.innerHTML'),
/Welcome Page A/
)
expect(await browser.eval('window.location.pathname')).toBe(`/about`)
expect(await browser.eval('window.location.search')).toBe(
'?override=internal'
)
})
it(`should rewrite to data urls for incoming data request internally rewritten`, async () => {
const res = await fetchViaHTTP(
next.url,
`/_next/data/${next.buildId}/es/about.json`,
{ override: 'internal' },
{ redirect: 'manual', headers: { 'x-nextjs-data': '1' } }
)
const json = await res.json()
expect(json.pageProps).toEqual({ abtest: true })
})
it('should override with rewrite externally correctly', async () => {
const res = await fetchViaHTTP(
next.url,
`/about`,
{ override: 'external' },
{ redirect: 'manual' }
)
expect(res.status).toBe(200)
expect(await res.text()).toContain('Example Domain')
const browser = await webdriver(next.url, ``)
await browser.elementByCss('#override-with-external-rewrite').click()
await check(
() => browser.eval('document.documentElement.innerHTML'),
/Example Domain/
)
await check(() => browser.eval('window.location.pathname'), `/about`)
await check(
() => browser.eval('window.location.search'),
'?override=external'
)
})
it(`should rewrite to the external url for incoming data request externally rewritten`, async () => {
const browser = await webdriver(
next.url,
`/_next/data/${next.buildId}/es/about.json?override=external`,
undefined
)
await check(
() => browser.eval('document.documentElement.innerHTML'),
/Example Domain/
)
})
it('should rewrite to fallback: true page successfully', async () => {
const randomSlug = `another-${Date.now()}`
const res2 = await fetchViaHTTP(next.url, `/to-blog/${randomSlug}`)
expect(res2.status).toBe(200)
expect(await res2.text()).toContain('Loading...')
const randomSlug2 = `another-${Date.now()}`
const browser = await webdriver(next.url, `/to-blog/${randomSlug2}`)
await check(async () => {
const props = JSON.parse(await browser.elementByCss('#props').text())
return props.params.slug === randomSlug2
? 'success'
: JSON.stringify(props)
}, 'success')
})
it('should allow to opt-out prefetch caching', async () => {
const browser = await webdriver(next.url, '/')
await browser.addCookie({ name: 'about-bypass', value: '1' })
await browser.refresh()
await browser.eval('window.__SAME_PAGE = true')
await browser.elementByCss('#link-with-rewritten-url').click()
await browser.waitForElementByCss('.refreshed')
await browser.deleteCookies()
expect(await browser.eval('window.__SAME_PAGE')).toBe(true)
const element = await browser.elementByCss('.title')
expect(await element.text()).toEqual('About Bypassed Page')
})
if (!(global as any).isNextDev) {
it('should cache data requests correctly', async () => {
const browser = await webdriver(next.url, '/')
await check(async () => {
const hrefs = await browser.eval(
`Object.keys(window.next.router.sdc)`
)
for (const url of [
'/en/about.json?override=external',
'/en/about.json?override=internal',
'/en/rewrite-me-external-twice.json',
'/en/rewrite-me-to-about.json?override=internal',
'/en/rewrite-me-to-vercel.json',
'/en/rewrite-to-ab-test.json',
]) {
if (!hrefs.some((href) => href.includes(url))) {
return JSON.stringify(hrefs, null, 2)
}
}
return 'yes'
}, 'yes')
})
}
it(`should allow to rewrite keeping the locale in pathname`, async () => {
const res = await fetchViaHTTP(next.url, '/fr/country', {
country: 'spain',
})
const html = await res.text()
const $ = cheerio.load(html)
expect($('#locale').text()).toBe('fr')
expect($('#country').text()).toBe('spain')
})
it(`should allow to rewrite to a different locale`, async () => {
const res = await fetchViaHTTP(next.url, '/country', {
'my-locale': 'es',
})
const html = await res.text()
const $ = cheerio.load(html)
expect($('#locale').text()).toBe('es')
expect($('#country').text()).toBe('us')
})
it(`should behave consistently on recursive rewrites`, async () => {
const res = await fetchViaHTTP(next.url, `/rewrite-me-to-about`, {
override: 'internal',
})
const html = await res.text()
const $ = cheerio.load(html)
expect($('.title').text()).toBe('About Page')
const browser = await webdriver(next.url, `/`)
await browser.elementByCss('#rewrite-me-to-about').click()
await check(
() => browser.eval(`window.location.pathname`),
`/rewrite-me-to-about`
)
const element = await browser.elementByCss('.title')
expect(await element.text()).toEqual('About Page')
})
it(`should allow to switch locales`, async () => {
const browser = await webdriver(next.url, '/i18n')
await browser.waitForElementByCss('.en')
await browser.elementByCss('#link-ja').click()
await browser.waitForElementByCss('.ja')
await browser.elementByCss('#link-en').click()
await browser.waitForElementByCss('.en')
await browser.elementByCss('#link-fr').click()
await browser.waitForElementByCss('.fr')
await browser.elementByCss('#link-ja2').click()
await browser.waitForElementByCss('.ja')
await browser.elementByCss('#link-en2').click()
await browser.waitForElementByCss('.en')
})
it('should allow to rewrite to a `beforeFiles` rewrite config', async () => {
const res = await fetchViaHTTP(
next.url,
`/rewrite-to-beforefiles-rewrite`
)
expect(res.status).toBe(200)
expect(await res.text()).toContain('Welcome Page A')
const browser = await webdriver(next.url, '/')
await browser.elementByCss('#rewrite-to-beforefiles-rewrite').click()
await check(
() => browser.eval('document.documentElement.innerHTML'),
/Welcome Page A/
)
expect(await browser.eval('window.location.pathname')).toBe(
`/rewrite-to-beforefiles-rewrite`
)
})
it('should allow to rewrite to a `afterFiles` rewrite config', async () => {
const res = await fetchViaHTTP(next.url, `/rewrite-to-afterfiles-rewrite`)
expect(res.status).toBe(200)
expect(await res.text()).toContain('Welcome Page B')
const browser = await webdriver(next.url, '/')
await browser.elementByCss('#rewrite-to-afterfiles-rewrite').click()
await check(
() => browser.eval('document.documentElement.innerHTML'),
/Welcome Page B/
)
expect(await browser.eval('window.location.pathname')).toBe(
`/rewrite-to-afterfiles-rewrite`
)
})
it('should handle shallow navigation correctly (non-dynamic page)', async () => {
const browser = await webdriver(next.url, '/about')
const requests = []
browser.on('request', (req) => {
const url = req.url()
if (url.includes('_next/data')) requests.push(url)
})
await browser.eval(
`next.router.push('/about?hello=world', undefined, { shallow: true })`
)
await check(() => browser.eval(`next.router.query.hello`), 'world')
expect(await browser.eval(`next.router.pathname`)).toBe('/about')
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({ hello: 'world' })
expect(await browser.eval('location.pathname')).toBe('/about')
expect(await browser.eval('location.search')).toBe('?hello=world')
expect(requests).toEqual([])
await browser.eval(
`next.router.push('/about', undefined, { shallow: true })`
)
await check(
() => browser.eval(`next.router.query.hello || 'empty'`),
'empty'
)
expect(await browser.eval(`next.router.pathname`)).toBe('/about')
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({})
expect(await browser.eval('location.pathname')).toBe('/about')
expect(await browser.eval('location.search')).toBe('')
expect(requests).toEqual([])
})
it('should handle shallow navigation correctly (dynamic page)', async () => {
const browser = await webdriver(next.url, '/fallback-true-blog/first', {
waitHydration: false,
})
let requests = []
browser.on('request', (req) => {
const url = req.url()
if (url.includes('_next/data')) requests.push(url)
})
// wait for initial query update request
await check(() => {
if (requests.length > 0) {
requests = []
return 'yup'
}
}, 'yup')
await browser.eval(
`next.router.push('/fallback-true-blog/first?hello=world', undefined, { shallow: true })`
)
await check(() => browser.eval(`next.router.query.hello`), 'world')
expect(await browser.eval(`next.router.pathname`)).toBe(
'/fallback-true-blog/[slug]'
)
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({ hello: 'world', slug: 'first' })
expect(await browser.eval('location.pathname')).toBe(
'/fallback-true-blog/first'
)
expect(await browser.eval('location.search')).toBe('?hello=world')
expect(requests).toEqual([])
await browser.eval(
`next.router.push('/fallback-true-blog/second', undefined, { shallow: true })`
)
await check(() => browser.eval(`next.router.query.slug`), 'second')
expect(await browser.eval(`next.router.pathname`)).toBe(
'/fallback-true-blog/[slug]'
)
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({
slug: 'second',
})
expect(await browser.eval('location.pathname')).toBe(
'/fallback-true-blog/second'
)
expect(await browser.eval('location.search')).toBe('')
expect(requests).toEqual([])
})
it('should resolve dynamic route after rewrite correctly', async () => {
const browser = await webdriver(next.url, '/fallback-true-blog/first', {
waitHydration: false,
})
let requests = []
browser.on('request', (req) => {
const url = new URL(
req
.url()
.replace(new RegExp(escapeStringRegexp(next.buildId)), 'BUILD_ID')
).pathname
if (url.includes('_next/data')) requests.push(url)
})
// wait for initial query update request
await check(() => {
if (requests.length > 0) {
requests = []
return 'yup'
}
}, 'yup')
expect(await browser.eval(`next.router.pathname`)).toBe(
'/fallback-true-blog/[slug]'
)
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({
slug: 'first',
})
expect(await browser.eval('location.pathname')).toBe(
'/fallback-true-blog/first'
)
expect(await browser.eval('location.search')).toBe('')
expect(requests).toEqual([])
await browser.eval(`next.router.push('/fallback-true-blog/rewritten')`)
await check(
() => browser.eval('document.documentElement.innerHTML'),
/About Page/
)
expect(await browser.eval(`next.router.pathname`)).toBe('/about')
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({})
expect(await browser.eval('location.pathname')).toBe(
'/fallback-true-blog/rewritten'
)
expect(await browser.eval('location.search')).toBe('')
expect(requests).toEqual([
`/_next/data/BUILD_ID/en/fallback-true-blog/rewritten.json`,
])
await browser.eval(`next.router.push('/fallback-true-blog/second')`)
await check(
() => browser.eval(`next.router.pathname`),
'/fallback-true-blog/[slug]'
)
expect(await browser.eval(`next.router.pathname`)).toBe(
'/fallback-true-blog/[slug]'
)
expect(
JSON.parse(await browser.eval(`JSON.stringify(next.router.query)`))
).toEqual({
slug: 'second',
})
expect(await browser.eval('location.pathname')).toBe(
'/fallback-true-blog/second'
)
expect(await browser.eval('location.search')).toBe('')
expect(
requests.filter(
(req) =>
![
`/_next/data/BUILD_ID/en/fallback-true-blog/rewritten.json`,
`/_next/data/BUILD_ID/en/fallback-true-blog/second.json`,
].includes(req)
)
).toEqual([])
})
}
function testsWithLocale(locale = '') {
const label = locale ? `${locale} ` : ``
it(`${label}should add a cookie and rewrite to a/b test`, async () => {
const res = await fetchViaHTTP(next.url, `${locale}/rewrite-to-ab-test`)
const html = await res.text()
const $ = cheerio.load(html)
// Set-Cookie header with Expires should not be split into two
expect(res.headers.raw()['set-cookie']).toHaveLength(1)
const bucket = getCookieFromResponse(res, 'bucket')
const expectedText = bucket === 'a' ? 'Welcome Page A' : 'Welcome Page B'
const browser = await webdriver(next.url, `${locale}/rewrite-to-ab-test`)
try {
expect(await browser.eval(`window.location.pathname`)).toBe(
`${locale}/rewrite-to-ab-test`
)
} finally {
await browser.close()
}
// -1 is returned if bucket was not found in func getCookieFromResponse
expect(bucket).not.toBe(-1)
expect($('.title').text()).toBe(expectedText)
})
it(`${label}should clear query parameters`, async () => {
const res = await fetchViaHTTP(next.url, `${locale}/clear-query-params`, {
a: '1',
b: '2',
foo: 'bar',
allowed: 'kept',
})
const html = await res.text()
const $ = cheerio.load(html)
expect(JSON.parse($('#my-query-params').text())).toEqual({
allowed: 'kept',
})
})
it(`${label}should rewrite to about page`, async () => {
const res = await fetchViaHTTP(next.url, `${locale}/rewrite-me-to-about`)
const html = await res.text()
const $ = cheerio.load(html)
const browser = await webdriver(next.url, `${locale}/rewrite-me-to-about`)
try {
expect(await browser.eval(`window.location.pathname`)).toBe(
`${locale}/rewrite-me-to-about`
)
} finally {
await browser.close()
}
expect($('.title').text()).toBe('About Page')
})
it(`${label}support colons in path`, async () => {
const path = `${locale}/not:param`
const res = await fetchViaHTTP(next.url, path)
const html = await res.text()
const $ = cheerio.load(html)
expect($('#props').text()).toBe('not:param')
const browser = await webdriver(next.url, path)
try {
expect(await browser.eval(`window.location.pathname`)).toBe(path)
} finally {
await browser.close()
}
})
it(`${label}can rewrite to path with colon`, async () => {
const path = `${locale}/rewrite-me-with-a-colon`
const res = await fetchViaHTTP(next.url, path)
const html = await res.text()
const $ = cheerio.load(html)
expect($('#props').text()).toBe('with:colon')
const browser = await webdriver(next.url, path)
try {
expect(await browser.eval(`window.location.pathname`)).toBe(path)
} finally {
await browser.close()
}
})
it(`${label}can rewrite from path with colon`, async () => {
const path = `${locale}/colon:here`
const res = await fetchViaHTTP(next.url, path)
const html = await res.text()
const $ = cheerio.load(html)
expect($('#props').text()).toBe('no-colon-here')
const browser = await webdriver(next.url, path)
try {
expect(await browser.eval(`window.location.pathname`)).toBe(path)
} finally {
await browser.close()
}
})
it(`${label}can rewrite from path with colon and retain query parameter`, async () => {
const path = `${locale}/colon:here?qp=arg`
const res = await fetchViaHTTP(next.url, path)
const html = await res.text()
const $ = cheerio.load(html)
expect($('#props').text()).toBe('no-colon-here')
expect($('#qp').text()).toBe('arg')
const browser = await webdriver(next.url, path)
try {
expect(
await browser.eval(
`window.location.href.replace(window.location.origin, '')`
)
).toBe(path)
} finally {
await browser.close()
}
})
it(`${label}can rewrite to path with colon and retain query parameter`, async () => {
const path = `${locale}/rewrite-me-with-a-colon?qp=arg`
const res = await fetchViaHTTP(next.url, path)
const html = await res.text()
const $ = cheerio.load(html)
expect($('#props').text()).toBe('with:colon')
expect($('#qp').text()).toBe('arg')
const browser = await webdriver(next.url, path)
try {
expect(
await browser.eval(
`window.location.href.replace(window.location.origin, '')`
)
).toBe(path)
} finally {
await browser.close()
}
})
if (!(global as any).isNextDeploy) {
it(`${label}should rewrite when not using localhost`, async () => {
const customUrl = new URL(next.url)
customUrl.hostname = 'localtest.me'
const res = await fetchViaHTTP(
customUrl.toString(),
`${locale}/rewrite-me-without-hard-navigation`
)
const html = await res.text()
const $ = cheerio.load(html)
expect($('.title').text()).toBe('About Page')
})
}
it(`${label}should rewrite to Vercel`, async () => {
const res = await fetchViaHTTP(next.url, `${locale}/rewrite-me-to-vercel`)
const html = await res.text()
// const browser = await webdriver(next.url, '/rewrite-me-to-vercel')
// TODO: running this to chech the window.location.pathname hangs for some reason;
expect(html).toContain('Example Domain')
})
it(`${label}should rewrite without hard navigation`, async () => {
const browser = await webdriver(next.url, '/')
await browser.eval('window.__SAME_PAGE = true')
await browser.elementByCss('#link-with-rewritten-url').click()
await browser.waitForElementByCss('.refreshed')
expect(await browser.eval('window.__SAME_PAGE')).toBe(true)
const element = await browser.elementByCss('.middleware')
expect(await element.text()).toEqual('foo')
})
it(`${label}should not call middleware with shallow push`, async () => {
const browser = await webdriver(next.url, '')
await browser.elementByCss('#link-to-shallow-push').click()
await browser.waitForCondition(
'new URL(window.location.href).searchParams.get("path") === "rewrite-me-without-hard-navigation"'
)
await expect(async () => {
await browser.waitForElementByCss('.refreshed', 500)
}).rejects.toThrow()
})
it(`${label}should correctly rewriting to a different dynamic path`, async () => {
const browser = await webdriver(next.url, '/dynamic-replace')
const element = await browser.elementByCss('.title')
expect(await element.text()).toEqual('Parts page')
const logs = await browser.log()
expect(
logs.every((log) => log.source === 'log' || log.source === 'info')
).toEqual(true)
})
it('should not have unexpected errors', async () => {
expect(next.cliOutput).not.toContain('unhandledRejection')
expect(next.cliOutput).not.toContain('ECONNRESET')
})
}
function getCookieFromResponse(res, cookieName) {
// node-fetch bundles the cookies as string in the Response
const cookieArray = res.headers.raw()['set-cookie']
for (const cookie of cookieArray) {
let individualCookieParams = cookie.split(';')
let individualCookie = individualCookieParams[0].split('=')
if (individualCookie[0] === cookieName) {
return individualCookie[1]
}
}
return -1
}
})