cargo registry - respect renamed dependencies (#32430)

rust allows renaming dependencies such as when depending on multiple
versions of the same package. This is not supported by gitea as
discovered in #31500 . This PR tries to address that.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/packages/cargo/parser.go

@@ -136,8 +136,16 @@ func parsePackage(r io.Reader) (*Package, error) {
 
 	dependencies := make([]*Dependency, 0, len(meta.Deps))
 	for _, dep := range meta.Deps {
+		// https://doc.rust-lang.org/cargo/reference/registry-web-api.html#publish
+		// It is a string of the new package name if the dependency is renamed, otherwise empty
+		name := dep.ExplicitNameInToml
+		pkg := &dep.Name
+		if name == "" {
+			name = dep.Name
+			pkg = nil
+		}
 		dependencies = append(dependencies, &Dependency{
-			Name:            dep.Name,
+			Name:            name,
 			Req:             dep.VersionReq,
 			Features:        dep.Features,
 			Optional:        dep.Optional,
@@ -145,6 +153,7 @@ func parsePackage(r io.Reader) (*Package, error) {
 			Target:          dep.Target,
 			Kind:            dep.Kind,
 			Registry:        dep.Registry,
+			Package:         pkg,
 		})
 	}
 

modules/packages/cargo/parser_test.go

@@ -13,16 +13,16 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestParsePackage(t *testing.T) {
 	const (
 		description = "Package Description"
 		author      = "KN4CK3R"
 		homepage    = "https://gitea.io/"
 		license     = "MIT"
+		payload     = "gitea test dummy payload" // a fake payload for test only
 	)
-
+	makeDefaultPackageMeta := func(name, version string) string {
-func TestParsePackage(t *testing.T) {
+		return `{
-	createPackage := func(name, version string) io.Reader {
-		metadata := `{
    "name":"` + name + `",
    "vers":"` + version + `",
    "description":"` + description + `",
@@ -36,18 +36,19 @@ func TestParsePackage(t *testing.T) {
    "homepage":"` + homepage + `",
    "license":"` + license + `"
 }`
-
+	}
+	createPackage := func(metadata string) io.Reader {
 		var buf bytes.Buffer
 		binary.Write(&buf, binary.LittleEndian, uint32(len(metadata)))
 		buf.WriteString(metadata)
-		binary.Write(&buf, binary.LittleEndian, uint32(4))
+		binary.Write(&buf, binary.LittleEndian, uint32(len(payload)))
-		buf.WriteString("test")
+		buf.WriteString(payload)
 		return &buf
 	}
 
 	t.Run("InvalidName", func(t *testing.T) {
 		for _, name := range []string{"", "0test", "-test", "_test", strings.Repeat("a", 65)} {
-			data := createPackage(name, "1.0.0")
+			data := createPackage(makeDefaultPackageMeta(name, "1.0.0"))
 
 			cp, err := ParsePackage(data)
 			assert.Nil(t, cp)
@@ -57,7 +58,7 @@ func TestParsePackage(t *testing.T) {
 
 	t.Run("InvalidVersion", func(t *testing.T) {
 		for _, version := range []string{"", "1.", "-1.0", "1.0.0/1"} {
-			data := createPackage("test", version)
+			data := createPackage(makeDefaultPackageMeta("test", version))
 
 			cp, err := ParsePackage(data)
 			assert.Nil(t, cp)
@@ -66,7 +67,7 @@ func TestParsePackage(t *testing.T) {
 	})
 
 	t.Run("Valid", func(t *testing.T) {
-		data := createPackage("test", "1.0.0")
+		data := createPackage(makeDefaultPackageMeta("test", "1.0.0"))
 
 		cp, err := ParsePackage(data)
 		assert.NotNil(t, cp)
@@ -78,9 +79,34 @@ func TestParsePackage(t *testing.T) {
 		assert.Equal(t, []string{author}, cp.Metadata.Authors)
 		assert.Len(t, cp.Metadata.Dependencies, 1)
 		assert.Equal(t, "dep", cp.Metadata.Dependencies[0].Name)
+		assert.Nil(t, cp.Metadata.Dependencies[0].Package)
 		assert.Equal(t, homepage, cp.Metadata.ProjectURL)
 		assert.Equal(t, license, cp.Metadata.License)
 		content, _ := io.ReadAll(cp.Content)
-		assert.Equal(t, "test", string(content))
+		assert.Equal(t, payload, string(content))
+	})
+
+	t.Run("Renamed", func(t *testing.T) {
+		data := createPackage(`{
+   "name":"test-pkg",
+   "vers":"1.0",
+   "description":"test-desc",
+   "authors": ["test-author"],
+   "deps":[
+      {
+         "name":"dep-renamed",
+         "explicit_name_in_toml":"dep-explicit",
+         "version_req":"1.0"
+      }
+   ],
+   "homepage":"https://gitea.io/",
+   "license":"MIT"
+}`)
+		cp, err := ParsePackage(data)
+		assert.NoError(t, err)
+		assert.Equal(t, "test-pkg", cp.Name)
+		assert.Equal(t, "https://gitea.io/", cp.Metadata.ProjectURL)
+		assert.Equal(t, "dep-explicit", cp.Metadata.Dependencies[0].Name)
+		assert.Equal(t, "dep-renamed", *cp.Metadata.Dependencies[0].Package)
 	})
 }