52 lines
1.8 KiB
JavaScript
52 lines
1.8 KiB
JavaScript
const { maxSatisfying: maxSatisfyingVersion } = require('semver')
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const PackageCache = require('../PackageCache')
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const PackageInfo = require('../PackageInfo')
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const { createPackageURL } = require('./PackageUtils')
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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 req.packageVersion 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).send(`Cannot get info for package "${req.packageName}"`)
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}
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if (packageInfo == null || packageInfo.versions == null)
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return res.status(404).send(`Cannot find package "${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).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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res.redirect(createPackageURL(req.packageName, tags[req.packageVersion], req.filename, req.search))
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} else {
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const maxVersion = maxSatisfyingVersion(Object.keys(versions), req.packageVersion)
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if (maxVersion) {
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res.redirect(createPackageURL(req.packageName, maxVersion, req.filename, req.search))
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} else {
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res.status(404).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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