Add support for NuGet API keys (#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>

routers/api/packages/api.go

@@ -46,6 +46,7 @@ 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
+}