[GITEA] feat(nuget): basic manifest download

Refs: https://codeberg.org/forgejo/forgejo/pulls/2222

(cherry picked from commit 5f837efc15f3d1e0d7fbed7fc569251143266584)

fix: write xml header

(cherry picked from commit a715984a42be9da81c48106d5eae244098ac1108)

fix: optional elements and xml schema

(cherry picked from commit 6ea6895a3616246e7282aa20d8f010fa931b60ea)

fix: pass all other requests to file search

(cherry picked from commit 9bfc74833a3b657453b4519573598432a87e3e3c)

test: add integration test

(cherry picked from commit b798f4ce86daa78e694c5c142e6f5f44938e6cb6)

fix: use xmlResponse

(cherry picked from commit 7f76df0b246c64fac0eeb115642c8cb6eb676f36)
(cherry picked from commit e18d574ca40905aec52fbbe8247ba83fd01874dd)

modules/packages/nuget/metadata.go

@@ -71,34 +71,50 @@ type Dependency struct {
 	Version string `json:"version"`
 }
 
-type nuspecPackage struct {
-	Metadata struct {
+type nuspecPackageType struct {
+	Name string `xml:"name,attr"`
+}
+
+type nuspecPackageTypes struct {
+	PackageType []nuspecPackageType `xml:"packageType"`
+}
+
+type nuspecRepository struct {
+	URL  string `xml:"url,attr,omitempty"`
+	Type string `xml:"type,attr,omitempty"`
+}
+type nuspecDependency struct {
+	ID      string `xml:"id,attr"`
+	Version string `xml:"version,attr"`
+	Exclude string `xml:"exclude,attr,omitempty"`
+}
+
+type nuspecGroup struct {
+	TargetFramework string             `xml:"targetFramework,attr"`
+	Dependency      []nuspecDependency `xml:"dependency"`
+}
+
+type nuspecDependencies struct {
+	Group []nuspecGroup `xml:"group"`
+}
+
+type nuspeceMetadata struct {
 	ID                       string              `xml:"id"`
 	Version                  string              `xml:"version"`
 	Authors                  string              `xml:"authors"`
-		RequireLicenseAcceptance bool   `xml:"requireLicenseAcceptance"`
-		ProjectURL               string `xml:"projectUrl"`
+	RequireLicenseAcceptance bool                `xml:"requireLicenseAcceptance,omitempty"`
+	ProjectURL               string              `xml:"projectUrl,omitempty"`
 	Description              string              `xml:"description"`
-		ReleaseNotes             string `xml:"releaseNotes"`
-		PackageTypes             struct {
-			PackageType []struct {
-				Name string `xml:"name,attr"`
-			} `xml:"packageType"`
-		} `xml:"packageTypes"`
-		Repository struct {
-			URL string `xml:"url,attr"`
-		} `xml:"repository"`
-		Dependencies struct {
-			Group []struct {
-				TargetFramework string `xml:"targetFramework,attr"`
-				Dependency      []struct {
-					ID      string `xml:"id,attr"`
-					Version string `xml:"version,attr"`
-					Exclude string `xml:"exclude,attr"`
-				} `xml:"dependency"`
-			} `xml:"group"`
-		} `xml:"dependencies"`
-	} `xml:"metadata"`
+	ReleaseNotes             string              `xml:"releaseNotes,omitempty"`
+	PackageTypes             *nuspecPackageTypes `xml:"packageTypes,omitempty"`
+	Repository               *nuspecRepository   `xml:"repository,omitempty"`
+	Dependencies             *nuspecDependencies `xml:"dependencies,omitempty"`
+}
+
+type nuspecPackage struct {
+	XMLName  xml.Name        `xml:"package"`
+	Xmlns    string          `xml:"xmlns,attr"`
+	Metadata nuspeceMetadata `xml:"metadata"`
 }
 
 // ParsePackageMetaData parses the metadata of a Nuget package file
@@ -149,23 +165,27 @@ func ParseNuspecMetaData(r io.Reader) (*Package, error) {
 	}
 
 	packageType := DependencyPackage
+	if p.Metadata.PackageTypes != nil {
 		for _, pt := range p.Metadata.PackageTypes.PackageType {
 			if pt.Name == "SymbolsPackage" {
 				packageType = SymbolsPackage
 				break
 			}
 		}
+	}
 
 	m := &Metadata{
 		Description:              p.Metadata.Description,
 		ReleaseNotes:             p.Metadata.ReleaseNotes,
 		Authors:                  p.Metadata.Authors,
 		ProjectURL:               p.Metadata.ProjectURL,
-		RepositoryURL:            p.Metadata.Repository.URL,
 		RequireLicenseAcceptance: p.Metadata.RequireLicenseAcceptance,
 		Dependencies:             make(map[string][]Dependency),
 	}
-
+	if p.Metadata.Repository != nil {
+		m.RepositoryURL = p.Metadata.Repository.URL
+	}
+	if p.Metadata.Dependencies != nil {
 		for _, group := range p.Metadata.Dependencies.Group {
 			deps := make([]Dependency, 0, len(group.Dependency))
 			for _, dep := range group.Dependency {
@@ -181,6 +201,7 @@ func ParseNuspecMetaData(r io.Reader) (*Package, error) {
 				m.Dependencies[group.TargetFramework] = deps
 			}
 		}
+	}
 	return &Package{
 		PackageType: packageType,
 		ID:          p.Metadata.ID,
@@ -204,3 +225,51 @@ func toNormalizedVersion(v *version.Version) string {
 	}
 	return buf.String()
 }
+
+// returning any here because we use a private type and we don't need the type for xml marshalling
+func GenerateNuspec(pd *Package) any {
+	m := nuspeceMetadata{
+		ID:                       pd.ID,
+		Version:                  pd.Version,
+		Authors:                  pd.Metadata.Authors,
+		Description:              pd.Metadata.Description,
+		ProjectURL:               pd.Metadata.ProjectURL,
+		RequireLicenseAcceptance: pd.Metadata.RequireLicenseAcceptance,
+	}
+
+	if pd.Metadata.RepositoryURL != "" {
+		m.Repository = &nuspecRepository{
+			URL: pd.Metadata.RepositoryURL,
+		}
+	}
+
+	groups := len(pd.Metadata.Dependencies)
+	if groups > 0 {
+		m.Dependencies = &nuspecDependencies{
+			Group: make([]nuspecGroup, 0, groups),
+		}
+
+		for tgf, deps := range pd.Metadata.Dependencies {
+			if len(deps) == 0 {
+				continue
+			}
+			gDeps := make([]nuspecDependency, 0, len(deps))
+			for _, dep := range deps {
+				gDeps = append(gDeps, nuspecDependency{
+					ID:      dep.ID,
+					Version: dep.Version,
+				})
+			}
+
+			m.Dependencies.Group = append(m.Dependencies.Group, nuspecGroup{
+				TargetFramework: tgf,
+				Dependency:      gDeps,
+			})
+		}
+	}
+
+	return &nuspecPackage{
+		Xmlns:    "http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd",
+		Metadata: m,
+	}
+}

routers/api/packages/nuget/nuget.go

@@ -387,12 +387,33 @@ func EnumeratePackageVersionsV3(ctx *context.Context) {
 	ctx.JSON(http.StatusOK, resp)
 }
 
-// https://docs.microsoft.com/en-us/nuget/api/package-base-address-resource#download-package-content-nupkg
+// https://learn.microsoft.com/en-us/nuget/api/package-base-address-resource#download-package-manifest-nuspec
+// https://learn.microsoft.com/en-us/nuget/api/package-base-address-resource#download-package-content-nupkg
 func DownloadPackageFile(ctx *context.Context) {
 	packageName := ctx.Params("id")
 	packageVersion := ctx.Params("version")
 	filename := ctx.Params("filename")
 
+	if filename == fmt.Sprintf("%s.nuspec", packageName) {
+		pv, err := packages_model.GetVersionByNameAndVersion(ctx, ctx.Package.Owner.ID, packages_model.TypeNuGet, packageName, packageVersion)
+		if err != nil {
+			apiError(ctx, http.StatusNotFound, err)
+			return
+		}
+
+		pd, err := packages_model.GetPackageDescriptor(ctx, pv)
+		if err != nil {
+			apiError(ctx, http.StatusInternalServerError, err)
+			return
+		}
+		pkg := &nuget_module.Package{
+			ID:       pd.Package.Name,
+			Version:  packageVersion,
+			Metadata: pd.Metadata.(*nuget_module.Metadata),
+		}
+
+		xmlResponse(ctx, http.StatusOK, nuget_module.GenerateNuspec(pkg))
+	} else {
 		s, u, pf, err := packages_service.GetFileStreamByPackageNameAndVersion(
 			ctx,
 			&packages_service.PackageInfo{
@@ -416,6 +437,7 @@ func DownloadPackageFile(ctx *context.Context) {
 
 		helper.ServePackageFile(ctx, s, u, pf)
 	}
+}
 
 // UploadPackage creates a new package with the metadata contained in the uploaded nupgk file
 // https://docs.microsoft.com/en-us/nuget/api/package-publish-resource#push-a-package

tests/integration/api_packages_nuget_test.go

@@ -353,6 +353,21 @@ AAAjQmxvYgAAAGm7ENm9SGxMtAFVvPUsPJTF6PbtAAAAAFcVogEJAAAAAQAAAA==`)
 
 		assert.Equal(t, content, resp.Body.Bytes())
 
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/package/%s/%s/%s.nuspec", url, packageName, packageVersion, packageName)).
+			AddBasicAuth(user.Name)
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		nuspec := `<?xml version="1.0" encoding="UTF-8"?>` + "\n" +
+			`<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd"><metadata>` +
+			`<id>` + packageName + `</id><version>` + packageVersion + `</version><authors>` + packageAuthors + `</authors><description>` + packageDescription + `</description>` +
+			`<dependencies><group targetFramework=".NETStandard2.0">` +
+			// https://github.com/golang/go/issues/21399 go can't generate self-closing tags
+			`<dependency id="Microsoft.CSharp" version="4.5.0"></dependency>` +
+			`</group></dependencies>` +
+			`</metadata></package>`
+
+		assert.Equal(t, nuspec, resp.Body.String())
+
 		checkDownloadCount(1)
 
 		req = NewRequest(t, "GET", fmt.Sprintf("%s/package/%s/%s/%s.%s.snupkg", url, packageName, packageVersion, packageName, packageVersion)).