62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
import { fileURLToPath } from 'url'
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import path from 'path'
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import { existsSync } from 'fs'
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import Page from '../lib/page.js'
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import { languageKeys } from '../lib/languages.js'
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const languagePrefixRegex = new RegExp(`^/(${languageKeys.join('|')})(/|$)`)
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const englishPrefixRegex = /^\/en(\/|$)/
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const __dirname = path.dirname(fileURLToPath(import.meta.url))
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const CONTENT_ROOT = path.posix.join(__dirname, '..', 'content')
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export default async function findPage(
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req,
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res,
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next,
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// Express won't execute these but it makes it easier to unit test
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// the middleware.
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{ isDev = process.env.NODE_ENV === 'development', contentRoot = CONTENT_ROOT } = {}
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) {
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// Filter out things like `/will/redirect` or `/_next/data/...`
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if (!languagePrefixRegex.test(req.pagePath)) {
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return next()
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}
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const page =
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isDev && englishPrefixRegex.test(req.pagePath)
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? await rereadByPath(req.pagePath, contentRoot, req.context.currentVersion)
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: req.context.pages[req.pagePath]
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if (page) {
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req.context.page = page
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req.context.page.version = req.context.currentVersion
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}
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return next()
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}
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async function rereadByPath(uri, contentRoot, currentVersion) {
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const languageCode = uri.match(languagePrefixRegex)[1]
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const withoutLanguage = uri.replace(languagePrefixRegex, '/')
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const withoutVersion = withoutLanguage.replace(`/${currentVersion}`, '')
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// TODO: Support loading translations the same way.
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// NOTE: No one is going to test translations like this in development
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// but perhaps one day we can always and only do these kinds of lookups
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// at runtime.
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const possible = path.join(contentRoot, withoutVersion)
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const filePath = existsSync(possible) ? path.join(possible, 'index.md') : possible + '.md'
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const relativePath = path.relative(contentRoot, filePath)
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const basePath = contentRoot
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// Remember, the Page.init() can return a Promise that resolves to falsy
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// if it can't read the file in from disk. E.g. a request for /en/non/existent.
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// In other words, it's fine if it can't be read from disk. It'll get
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// handled and turned into a nice 404 message.
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return await Page.init({
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basePath,
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relativePath,
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languageCode,
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})
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}
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