80 lines
3.5 KiB
JavaScript
80 lines
3.5 KiB
JavaScript
const path = require('path')
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const slash = require('slash')
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const { 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 got = require('got')
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const archvivedRedirects = require('../lib/redirects/static/archived-redirects-from-213-to-217')
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const archivedFrontmatterFallbacks = require('../lib/redirects/static/archived-frontmatter-fallbacks')
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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 = archvivedRedirects[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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return archivedFrontmatterFallbacks.find(arrayOfFallbacks => arrayOfFallbacks.includes(req.path))
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}
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