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worker.js
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worker.js
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import mkdirpModule from 'mkdirp'
import { promisify } from 'util'
import url from 'url'
import { extname, join, dirname, sep } from 'path'
import { renderToHTML } from '../next-server/server/render'
import { writeFile, access } from 'fs'
import AmpHtmlValidator from 'amphtml-validator'
import { loadComponents } from '../next-server/server/load-components'
import { isDynamicRoute } from '../next-server/lib/router/utils/is-dynamic'
import { getRouteMatcher } from '../next-server/lib/router/utils/route-matcher'
import { getRouteRegex } from '../next-server/lib/router/utils/route-regex'
import { normalizePagePath } from '../next-server/server/normalize-page-path'
import { SERVER_PROPS_EXPORT_ERROR } from '../lib/constants'
const envConfig = require('../next-server/lib/runtime-config')
const writeFileP = promisify(writeFile)
const mkdirp = promisify(mkdirpModule)
const accessP = promisify(access)
global.__NEXT_DATA__ = {
nextExport: true,
}
export default async function({
path,
pathMap,
distDir,
buildId,
outDir,
pagesDataDir,
renderOpts,
buildExport,
serverRuntimeConfig,
subFolders,
serverless,
}) {
let results = {
ampValidations: [],
}
try {
const { query: originalQuery = {} } = pathMap
const { page } = pathMap
const filePath = normalizePagePath(path)
const ampPath = `${filePath}.amp`
let query = { ...originalQuery }
let params
// We need to show a warning if they try to provide query values
// for an auto-exported page since they won't be available
const hasOrigQueryValues = Object.keys(originalQuery).length > 0
const queryWithAutoExportWarn = () => {
if (hasOrigQueryValues) {
throw new Error(
`\nError: you provided query values for ${path} which is an auto-exported page. These can not be applied since the page can no longer be re-rendered on the server. To disable auto-export for this page add \`getInitialProps\`\n`
)
}
}
// Check if the page is a specified dynamic route
if (isDynamicRoute(page) && page !== path) {
params = getRouteMatcher(getRouteRegex(page))(path)
if (params) {
// we have to pass these separately for serverless
if (!serverless) {
query = {
...query,
...params,
}
}
} else {
throw new Error(
`The provided export path '${path}' doesn't match the '${page}' page.\nRead more: https://err.sh/zeit/next.js/export-path-mismatch`
)
}
}
const headerMocks = {
headers: {},
getHeader: () => ({}),
setHeader: () => {},
hasHeader: () => false,
removeHeader: () => {},
getHeaderNames: () => [],
}
const req = {
url: path,
...headerMocks,
}
const res = {
...headerMocks,
}
envConfig.setConfig({
serverRuntimeConfig,
publicRuntimeConfig: renderOpts.runtimeConfig,
})
let htmlFilename = `${filePath}${sep}index.html`
if (!subFolders) htmlFilename = `${filePath}.html`
const pageExt = extname(page)
const pathExt = extname(path)
// Make sure page isn't a folder with a dot in the name e.g. `v1.2`
if (pageExt !== pathExt && pathExt !== '') {
// If the path has an extension, use that as the filename instead
htmlFilename = path
} else if (path === '/') {
// If the path is the root, just use index.html
htmlFilename = 'index.html'
}
const baseDir = join(outDir, dirname(htmlFilename))
let htmlFilepath = join(outDir, htmlFilename)
await mkdirp(baseDir)
let html
let curRenderOpts = {}
let renderMethod = renderToHTML
const renderedDuringBuild = getStaticProps => {
return !buildExport && getStaticProps && !isDynamicRoute(path)
}
if (serverless) {
const curUrl = url.parse(req.url, true)
req.url = url.format({
...curUrl,
query: {
...curUrl.query,
...query,
},
})
const { Component: mod, getServerSideProps } = await loadComponents(
distDir,
buildId,
page,
serverless
)
if (getServerSideProps) {
throw new Error(`Error for page ${page}: ${SERVER_PROPS_EXPORT_ERROR}`)
}
// if it was auto-exported the HTML is loaded here
if (typeof mod === 'string') {
html = mod
queryWithAutoExportWarn()
} else {
// for non-dynamic SSG pages we should have already
// prerendered the file
if (renderedDuringBuild(mod.getStaticProps)) return results
if (mod.getStaticProps && !htmlFilepath.endsWith('.html')) {
// make sure it ends with .html if the name contains a dot
htmlFilename += '.html'
htmlFilepath += '.html'
}
renderMethod = mod.renderReqToHTML
const result = await renderMethod(
req,
res,
'export',
{ ampPath },
params
)
curRenderOpts = result.renderOpts || {}
html = result.html
}
if (!html) {
throw new Error(`Failed to render serverless page`)
}
} else {
const components = await loadComponents(
distDir,
buildId,
page,
serverless
)
if (components.getServerSideProps) {
throw new Error(`Error for page ${page}: ${SERVER_PROPS_EXPORT_ERROR}`)
}
// for non-dynamic SSG pages we should have already
// prerendered the file
if (renderedDuringBuild(components.getStaticProps)) {
return results
}
// TODO: de-dupe the logic here between serverless and server mode
if (components.getStaticProps && !htmlFilepath.endsWith('.html')) {
// make sure it ends with .html if the name contains a dot
htmlFilepath += '.html'
htmlFilename += '.html'
}
if (typeof components.Component === 'string') {
html = components.Component
queryWithAutoExportWarn()
} else {
curRenderOpts = { ...components, ...renderOpts, ampPath, params }
html = await renderMethod(req, res, page, query, curRenderOpts)
}
}
const validateAmp = async (html, page, validatorPath) => {
const validator = await AmpHtmlValidator.getInstance(validatorPath)
const result = validator.validateString(html)
const errors = result.errors.filter(e => e.severity === 'ERROR')
const warnings = result.errors.filter(e => e.severity !== 'ERROR')
if (warnings.length || errors.length) {
results.ampValidations.push({
page,
result: {
errors,
warnings,
},
})
}
}
if (curRenderOpts.inAmpMode) {
await validateAmp(html, path, curRenderOpts.ampValidatorPath)
} else if (curRenderOpts.hybridAmp) {
// we need to render the AMP version
let ampHtmlFilename = `${ampPath}${sep}index.html`
if (!subFolders) {
ampHtmlFilename = `${ampPath}.html`
}
const ampBaseDir = join(outDir, dirname(ampHtmlFilename))
const ampHtmlFilepath = join(outDir, ampHtmlFilename)
try {
await accessP(ampHtmlFilepath)
} catch (_) {
// make sure it doesn't exist from manual mapping
let ampHtml
if (serverless) {
req.url += (req.url.includes('?') ? '&' : '?') + 'amp=1'
ampHtml = (await renderMethod(req, res, 'export')).html
} else {
ampHtml = await renderMethod(
req,
res,
page,
{ ...query, amp: 1 },
curRenderOpts
)
}
await validateAmp(ampHtml, page + '?amp=1')
await mkdirp(ampBaseDir)
await writeFileP(ampHtmlFilepath, ampHtml, 'utf8')
}
}
if (curRenderOpts.pageData) {
const dataFile = join(
pagesDataDir,
htmlFilename.replace(/\.html$/, '.json')
)
await mkdirp(dirname(dataFile))
await writeFileP(dataFile, JSON.stringify(curRenderOpts.pageData), 'utf8')
}
results.fromBuildExportRevalidate = curRenderOpts.revalidate
await writeFileP(htmlFilepath, html, 'utf8')
return results
} catch (error) {
console.error(
`\nError occurred prerendering page "${path}". Read more: https://err.sh/next.js/prerender-error:\n` +
error
)
return { ...results, error: true }
}
}