Add Go package registry (#24687)

Fixes #7608

This PR adds a Go package registry usable with the Go proxy protocol.

![grafik](https://github.com/go-gitea/gitea/assets/1666336/328feb5c-3df2-4f9d-8eae-fe3126d14c37)

tests/integration/api_packages_goproxy_test.go

@@ -0,0 +1,166 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"archive/zip"
+	"bytes"
+	"fmt"
+	"net/http"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/packages"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPackageGo(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	packageName := "gitea.com/go-gitea/gitea"
+	packageVersion := "v0.0.1"
+	packageVersion2 := "v0.0.2"
+	goModContent := `module "gitea.com/go-gitea/gitea"`
+
+	createArchive := func(files map[string][]byte) []byte {
+		var buf bytes.Buffer
+		zw := zip.NewWriter(&buf)
+		for name, content := range files {
+			w, _ := zw.Create(name)
+			w.Write(content)
+		}
+		zw.Close()
+		return buf.Bytes()
+	}
+
+	url := fmt.Sprintf("/api/packages/%s/go", user.Name)
+
+	t.Run("Upload", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		content := createArchive(nil)
+
+		req := NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		MakeRequest(t, req, http.StatusUnauthorized)
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusBadRequest)
+
+		content = createArchive(map[string][]byte{
+			packageName + "@" + packageVersion + "/go.mod": []byte(goModContent),
+		})
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusCreated)
+
+		pvs, err := packages.GetVersionsByPackageType(db.DefaultContext, user.ID, packages.TypeGo)
+		assert.NoError(t, err)
+		assert.Len(t, pvs, 1)
+
+		pd, err := packages.GetPackageDescriptor(db.DefaultContext, pvs[0])
+		assert.NoError(t, err)
+		assert.Nil(t, pd.Metadata)
+		assert.Equal(t, packageName, pd.Package.Name)
+		assert.Equal(t, packageVersion, pd.Version.Version)
+
+		pfs, err := packages.GetFilesByVersionID(db.DefaultContext, pvs[0].ID)
+		assert.NoError(t, err)
+		assert.Len(t, pfs, 1)
+		assert.Equal(t, packageVersion+".zip", pfs[0].Name)
+		assert.True(t, pfs[0].IsLead)
+
+		pb, err := packages.GetBlobByID(db.DefaultContext, pfs[0].BlobID)
+		assert.NoError(t, err)
+		assert.Equal(t, int64(len(content)), pb.Size)
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusConflict)
+
+		time.Sleep(time.Second)
+
+		content = createArchive(map[string][]byte{
+			packageName + "@" + packageVersion2 + "/go.mod": []byte(goModContent),
+		})
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusCreated)
+	})
+
+	t.Run("List", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/list", url, packageName))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, packageVersion+"\n"+packageVersion2+"\n", resp.Body.String())
+	})
+
+	t.Run("Info", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/%s.info", url, packageName, packageVersion))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		type Info struct {
+			Version string    `json:"Version"`
+			Time    time.Time `json:"Time"`
+		}
+
+		info := &Info{}
+		DecodeJSON(t, resp, &info)
+
+		assert.Equal(t, packageVersion, info.Version)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/latest.info", url, packageName))
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		info = &Info{}
+		DecodeJSON(t, resp, &info)
+
+		assert.Equal(t, packageVersion2, info.Version)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@latest", url, packageName))
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		info = &Info{}
+		DecodeJSON(t, resp, &info)
+
+		assert.Equal(t, packageVersion2, info.Version)
+	})
+
+	t.Run("GoMod", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/%s.mod", url, packageName, packageVersion))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, goModContent, resp.Body.String())
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/latest.mod", url, packageName))
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, goModContent, resp.Body.String())
+	})
+
+	t.Run("Download", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/%s.zip", url, packageName, packageVersion))
+		MakeRequest(t, req, http.StatusOK)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/latest.zip", url, packageName))
+		MakeRequest(t, req, http.StatusOK)
+	})
+}