97 lines
4.3 KiB
JavaScript
97 lines
4.3 KiB
JavaScript
const path = require('path')
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const slash = require('slash')
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const { latest, firstVersionDeprecatedOnNewSite, lastVersionWithoutStubbedRedirectFiles } = require('../lib/enterprise-server-releases')
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const patterns = require('../lib/patterns')
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const versionSatisfiesRange = require('../lib/version-satisfies-range')
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const isArchivedVersion = require('../lib/is-archived-version')
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const findPage = require('../lib/find-page')
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const got = require('got')
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// This module handles requests for deprecated GitHub Enterprise versions
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// by routing them to static content in help-docs-archived-enterprise-versions
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module.exports = async (req, res, next) => {
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const { isArchived, requestedVersion } = isArchivedVersion(req)
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if (!isArchived) return next()
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// Skip asset paths
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if (patterns.assetPaths.test(req.path)) return next()
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// redirect language-prefixed URLs like /en/enterprise/2.10 -> /enterprise/2.10
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// (this only applies to versions <2.13)
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if (req.path.startsWith('/en/') && versionSatisfiesRange(requestedVersion, `<${firstVersionDeprecatedOnNewSite}`)) {
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return res.redirect(301, req.baseUrl + req.path.replace(/^\/en/, ''))
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}
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// find redirects for versions between 2.13 and 2.17
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// starting with 2.18, we updated the archival script to create stubbed HTML redirect files
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if (versionSatisfiesRange(requestedVersion, `>=${firstVersionDeprecatedOnNewSite}`) &&
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versionSatisfiesRange(requestedVersion, `<=${lastVersionWithoutStubbedRedirectFiles}`)) {
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const redirect = req.context.redirects[req.path]
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if (redirect && redirect !== req.path) {
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return res.redirect(301, redirect)
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}
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}
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try {
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const r = await got(getProxyPath(req.path, requestedVersion))
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res.set('content-type', r.headers['content-type'])
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res.set('x-robots-tag', 'noindex')
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// make the stubbed redirect files added in >=2.18 return 301 instead of 200
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const staticRedirect = r.body.match(patterns.staticRedirect)
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if (staticRedirect) {
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res.status(301)
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res.set('location', staticRedirect[1])
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}
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res.send(r.body)
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} catch (err) {
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for (const fallbackRedirect of getFallbackRedirects(req, requestedVersion) || []) {
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try {
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await got(getProxyPath(fallbackRedirect, requestedVersion))
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return res.redirect(301, fallbackRedirect)
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} catch (err) { } // noop
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}
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next()
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}
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}
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// paths are slightly different depending on the version
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// for >=2.13: /2.13/en/enterprise/2.13/user/articles/viewing-contributions-on-your-profile
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// for <2.13: /2.12/user/articles/viewing-contributions-on-your-profile
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function getProxyPath (reqPath, requestedVersion) {
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const proxyPath = versionSatisfiesRange(requestedVersion, `>=${firstVersionDeprecatedOnNewSite}`)
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? slash(path.join('/', requestedVersion, reqPath))
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: reqPath.replace(/^\/enterprise/, '')
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return `https://github.github.com/help-docs-archived-enterprise-versions${proxyPath}`
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}
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// from 2.13 to 2.17, we lost access to frontmatter redirects during the archival process
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// this workaround finds potentially relevant frontmatter redirects in currently supported pages
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function getFallbackRedirects (req, requestedVersion) {
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if (versionSatisfiesRange(requestedVersion, `<${firstVersionDeprecatedOnNewSite}`)) return
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if (versionSatisfiesRange(requestedVersion, `>${lastVersionWithoutStubbedRedirectFiles}`)) return
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const pathWithNewVersion = req.path.replace(requestedVersion, latest)
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// look for a page with the same path on a currently supported version
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const currentlySupportedPage = findPage(pathWithNewVersion, req.context.pages, req.context.redirects)
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if (!currentlySupportedPage) return
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// get an array of viable old paths
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return Object.keys(currentlySupportedPage.redirects)
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// filter for just languageless and versionless enterprise old paths
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// example: [
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// '/enterprise/user/articles/viewing-contributions',
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// '/enterprise/user/articles/viewing-contributions-on-your-profile-page',
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// '/enterprise/user/articles/viewing-contributions-on-your-profile'
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// ]
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.filter(oldPath => oldPath.startsWith('/enterprise') && patterns.enterpriseNoVersion.test(oldPath))
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// add in the current language and version
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.map(oldPath => slash(path.join('/', req.context.currentLanguage, oldPath.replace('/enterprise/', `/enterprise/${requestedVersion}/`))))
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// ignore paths that match the requested path
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.filter(oldPath => oldPath !== req.path)
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}
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