You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: auth.go
    path of file: ./repos/gitea/routers/api/packages/nuget
    
    the code of the file until where you have to start completion: // Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package nuget

import (
	"net/http"

	auth_model "code.gitea.io/gitea/models/auth"
	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"
)

var _ auth.Method = &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, error) {
	token, err := auth_model.GetAccessTokenBySHA(req.Context(), req.Heade
    
func (a *Auth) Verify(req *http.Request, w http.ResponseWriter, store auth.DataStore, sess auth.SessionStore) (*user_model.User, error) {
	token, err := auth_model.GetAccessTokenBySHA(req.Context(), req.Header.Get("X-NuGet-ApiKey"))
	if err != nil {
		if !(auth_model.IsErrAccessTokenNotExist(err) || auth_model.IsErrAccessTokenEmpty(err)) {
			log.Error("GetAccessTokenBySHA: %v", err)
			return nil, err
		}
		return nil, nil
	}

	u, err := user_model.GetUserByID(req.Context(), token.UID)
	if err != nil {
		log.Error("GetUserByID:  %v", err)
		return nil, err
	}

	token.UpdatedUnix = timeutil.TimeStampNow()
	if err := auth_model.UpdateAccessToken(req.Context(), token); err != nil {
		log.Error("UpdateAccessToken:  %v", err)
	}

	return u, nil
}