From 49a4464160254604d2c42b760a901952d8bc3c8b Mon Sep 17 00:00:00 2001
From: Wayne Starr <Racer159@users.noreply.github.com>
Date: Mon, 24 Oct 2022 08:50:22 -0500
Subject: [PATCH] Allow for resolution of NPM registry paths that match
 upstream (#21568)

This PR fixes issue #21567 allowing for package tarball URLs to match
the upstream registry (and GitLab/JFrog Artifactory URLs). It uses a
regex to parse the filename (which contains the NPM version) and does a
fuzzy search to pull it out. The regex was built/expanded from
http://json.schemastore.org/package,
https://github.com/Masterminds/semver, and
https://docs.npmjs.com/cli/v6/using-npm/semver and is testable here:
https://regex101.com/r/OydBJq/5

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
---
 routers/api/packages/api.go                |  2 +
 routers/api/packages/npm/npm.go            | 43 ++++++++++++++++++++++
 tests/integration/api_packages_npm_test.go |  8 +++-
 3 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/routers/api/packages/api.go b/routers/api/packages/api.go
index f6ab961f5..69c8dd656 100644
--- a/routers/api/packages/api.go
+++ b/routers/api/packages/api.go
@@ -215,6 +215,7 @@ func Routes(ctx gocontext.Context) *web.Route {
 					r.Get("", npm.DownloadPackageFile)
 					r.Delete("/-rev/{revision}", reqPackageAccess(perm.AccessModeWrite), npm.DeletePackageVersion)
 				})
+				r.Get("/-/{filename}", npm.DownloadPackageFileByName)
 				r.Group("/-rev/{revision}", func() {
 					r.Delete("", npm.DeletePackage)
 					r.Put("", npm.DeletePreview)
@@ -227,6 +228,7 @@ func Routes(ctx gocontext.Context) *web.Route {
 					r.Get("", npm.DownloadPackageFile)
 					r.Delete("/-rev/{revision}", reqPackageAccess(perm.AccessModeWrite), npm.DeletePackageVersion)
 				})
+				r.Get("/-/{filename}", npm.DownloadPackageFileByName)
 				r.Group("/-rev/{revision}", func() {
 					r.Delete("", npm.DeletePackage)
 					r.Put("", npm.DeletePreview)
diff --git a/routers/api/packages/npm/npm.go b/routers/api/packages/npm/npm.go
index 2989ce6e7..82dae0cf4 100644
--- a/routers/api/packages/npm/npm.go
+++ b/routers/api/packages/npm/npm.go
@@ -106,6 +106,49 @@ func DownloadPackageFile(ctx *context.Context) {
 	ctx.ServeContent(pf.Name, s, pf.CreatedUnix.AsLocalTime())
 }
 
+// DownloadPackageFileByName finds the version and serves the contents of a package
+func DownloadPackageFileByName(ctx *context.Context) {
+	filename := ctx.Params("filename")
+
+	pvs, _, err := packages_model.SearchVersions(ctx, &packages_model.PackageSearchOptions{
+		OwnerID: ctx.Package.Owner.ID,
+		Type:    packages_model.TypeNpm,
+		Name: packages_model.SearchValue{
+			ExactMatch: true,
+			Value:      packageNameFromParams(ctx),
+		},
+		HasFileWithName: filename,
+		IsInternal:      util.OptionalBoolFalse,
+	})
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	if len(pvs) != 1 {
+		apiError(ctx, http.StatusNotFound, nil)
+		return
+	}
+
+	s, pf, err := packages_service.GetFileStreamByPackageVersion(
+		ctx,
+		pvs[0],
+		&packages_service.PackageFileInfo{
+			Filename: filename,
+		},
+	)
+	if err != nil {
+		if err == packages_model.ErrPackageFileNotExist {
+			apiError(ctx, http.StatusNotFound, err)
+			return
+		}
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	defer s.Close()
+
+	ctx.ServeContent(pf.Name, s, pf.CreatedUnix.AsLocalTime())
+}
+
 // UploadPackage creates a new package
 func UploadPackage(ctx *context.Context) {
 	npmPackage, err := npm_module.ParsePackage(ctx.Req.Body)
diff --git a/tests/integration/api_packages_npm_test.go b/tests/integration/api_packages_npm_test.go
index 4fdcf6682..20412fe72 100644
--- a/tests/integration/api_packages_npm_test.go
+++ b/tests/integration/api_packages_npm_test.go
@@ -127,10 +127,16 @@ func TestPackageNpm(t *testing.T) {
 		b, _ := base64.StdEncoding.DecodeString(data)
 		assert.Equal(t, b, resp.Body.Bytes())
 
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/-/%s", root, filename))
+		req = addTokenAuthHeader(req, token)
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, b, resp.Body.Bytes())
+
 		pvs, err := packages.GetVersionsByPackageType(db.DefaultContext, user.ID, packages.TypeNpm)
 		assert.NoError(t, err)
 		assert.Len(t, pvs, 1)
-		assert.Equal(t, int64(1), pvs[0].DownloadCount)
+		assert.Equal(t, int64(2), pvs[0].DownloadCount)
 	})
 
 	t.Run("PackageMetadata", func(t *testing.T) {