Add support for NuGet API keys (go-gitea#20721)

* Add support for NuGet API key.

* lint

* Apply suggestions from code review

Co-authored-by: delvh <dev.lh@web.de>

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

docs/content/doc/packages/nuget.en-us.md

@@ -47,6 +47,8 @@ For example:
 dotnet nuget add source --name gitea --username testuser --password password123 https://gitea.example.com/api/packages/testuser/nuget/index.json
 ```
 
+You can add the source without credentials and use the [`--api-key`](https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-nuget-push) parameter when publishing packages. In this case you need to provide a [personal access token]({{< relref "doc/developers/api-usage.en-us.md#authentication" >}}).
+
 ## Publish a package
 
 Publish a package by running the following command:

integrations/api_packages_nuget_test.go

@@ -24,9 +24,16 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func addNuGetAPIKeyHeader(request *http.Request, token string) *http.Request {
+	request.Header.Set("X-NuGet-ApiKey", token)
+	return request
+}
+
 func TestPackageNuGet(t *testing.T) {
 	defer prepareTestEnv(t)()
+
 	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2}).(*user_model.User)
+	token := getUserToken(t, user.Name)
 
 	packageName := "test.package"
 	packageVersion := "1.0.3"
@@ -60,6 +67,10 @@ func TestPackageNuGet(t *testing.T) {
 
 		req := NewRequest(t, "GET", fmt.Sprintf("%s/index.json", url))
 		req = AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusOK)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/index.json", url))
+		req = addNuGetAPIKeyHeader(req, token)
 		resp := MakeRequest(t, req, http.StatusOK)
 
 		var result nuget.ServiceIndexResponse

routers/api/packages/api.go

@@ -45,6 +45,7 @@ func Routes() *web.Route {
 	authMethods := []auth.Method{
 		&auth.OAuth2{},
 		&auth.Basic{},
+		&nuget.Auth{},
 		&conan.Auth{},
 	}
 	if setting.Service.EnableReverseProxyAuth {

routers/api/packages/nuget/auth.go

@@ -0,0 +1,45 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package nuget
+
+import (
+	"net/http"
+
+	"code.gitea.io/gitea/models"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/services/auth"
+)
+
+type Auth struct{}
+
+func (a *Auth) Name() string {
+	return "nuget"
+}
+
+// https://docs.microsoft.com/en-us/nuget/api/package-publish-resource#request-parameters
+func (a *Auth) Verify(req *http.Request, w http.ResponseWriter, store auth.DataStore, sess auth.SessionStore) *user_model.User {
+	token, err := models.GetAccessTokenBySHA(req.Header.Get("X-NuGet-ApiKey"))
+	if err != nil {
+		if !(models.IsErrAccessTokenNotExist(err) || models.IsErrAccessTokenEmpty(err)) {
+			log.Error("GetAccessTokenBySHA: %v", err)
+		}
+		return nil
+	}
+
+	u, err := user_model.GetUserByID(token.UID)
+	if err != nil {
+		log.Error("GetUserByID:  %v", err)
+		return nil
+	}
+
+	token.UpdatedUnix = timeutil.TimeStampNow()
+	if err := models.UpdateAccessToken(token); err != nil {
+		log.Error("UpdateAccessToken:  %v", err)
+	}
+
+	return u
+}