60 lines
2.0 KiB
JavaScript
60 lines
2.0 KiB
JavaScript
const semver = require('semver')
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const PackageCache = require('../PackageCache')
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const PackageInfo = require('../PackageInfo')
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const PackageURL = require('../PackageURL')
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/**
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* Fetch the package from the registry and store a local copy on disk.
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* Redirect if the URL does not specify an exact version number.
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*/
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function fetchPackage(req, res, next) {
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PackageInfo.get(req.packageName, function (error, packageInfo) {
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if (error) {
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console.error(error)
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return res.status(500).type('text').send(`Cannot get info for package "${req.packageName}"`)
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}
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if (packageInfo == null || packageInfo.versions == null)
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return res.status(404).type('text').send(`Cannot find package "${req.packageName}"`)
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req.packageInfo = packageInfo
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const { versions, 'dist-tags': tags } = req.packageInfo
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if (req.packageVersion in versions) {
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// A valid request for a package we haven't downloaded yet.
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req.packageConfig = versions[req.packageVersion]
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PackageCache.get(req.packageConfig, function (error, outputDir) {
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if (error) {
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console.error(error)
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res.status(500).type('text').send(`Cannot fetch package ${req.packageSpec}`)
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} else {
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req.packageDir = outputDir
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next()
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}
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})
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} else if (req.packageVersion in tags) {
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// Cache tag redirects for 1 minute.
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res.set({
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'Cache-Control': 'public, max-age=60',
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'Cache-Tag': 'redirect'
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}).redirect(PackageURL.create(req.packageName, tags[req.packageVersion], req.filename, req.search))
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} else {
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const maxVersion = semver.maxSatisfying(Object.keys(versions), req.packageVersion)
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if (maxVersion) {
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// Cache semver redirects for 1 minute.
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res.set({
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'Cache-Control': 'public, max-age=60',
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'Cache-Tag': 'redirect'
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}).redirect(PackageURL.create(req.packageName, maxVersion, req.filename, req.search))
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} else {
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res.status(404).type('text').send(`Cannot find package ${req.packageSpec}`)
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}
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}
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})
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}
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module.exports = fetchPackage
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