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// Copyright 2019 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 auth

import (
	"net/http"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/log"
)

// Ensure the struct implements the interface.
var (
	_ Auth = &Session{}
)

// Session checks if there is a user uid stored in the session and returns the user
// object for that uid.
type Session struct {
}

// Init does nothing as the Session implementation does not need to allocate any resources
func (s *Session) Init() error {
	return nil
}

// Name represents the name of auth method
func (s *Session) Name() string {
	return "session"
}

// Free does nothing as the Session implementation does not have to release any resources
func (s *Session) Free() error {
	return nil
}

// Verify checks if there is a user uid stored in the session and returns the user
// object for that uid.
// Returns nil if there is no user uid stored in the session.
func (s *Session) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) *models.User {
	user := SessionUser(sess)
	if user != nil {
		return user
	}
	return nil
}

// SessionUser returns the user object corresponding to the "uid" session variable.
func SessionUser(sess SessionStore) *models.User {
	// Get user ID
	uid := sess.Get("uid")
	if uid == nil {
		return nil
	}
	log.Trace("Session Authorization: Found user[%d]", uid)

	id, ok := uid.(int64)
	if !ok {
		return nil
	}

	// Get user object
	user, err := models.GetUserByID(id)
	if err != nil {
		if !models.IsErrUserNotExist(err) {
			log.Error("GetUserById: %v", err)
		}
		return nil
	}

	log.Trace("Session Authorization: Logged in user %-v", user)
	return user
}