feat(session): Added session list functionality with usernames

- Added the `SessionWithUser` structure, which includes `Session` and `Username` fields.
- Added the `ListSessionsWithUser` function, which queries and returns a list of sessions with usernames.
- Used a `JOIN` operation to join the session and user tables to retrieve the username associated with each session.
- Changed `ListSessions` to `ListSessionsWithUser` to ensure that the username is retrieved.

internal/db/session.go

@@ -1,11 +1,17 @@
 package db
 
 import (
+	"github.com/alist-org/alist/v3/internal/conf"
 	"github.com/alist-org/alist/v3/internal/model"
 	"github.com/pkg/errors"
 	"gorm.io/gorm/clause"
 )
 
+type SessionWithUser struct {
+	model.Session
+	Username string
+}
+
 func GetSession(userID uint, deviceKey string) (*model.Session, error) {
 	s := model.Session{UserID: userID, DeviceKey: deviceKey}
 	if err := db.Select("user_id, device_key, last_active, status, user_agent, ip").Where(&s).First(&s).Error; err != nil {
@@ -64,6 +70,19 @@ func ListSessions() ([]model.Session, error) {
 	return sessions, errors.WithStack(err)
 }
 
+func ListSessionsWithUser() ([]SessionWithUser, error) {
+	var sessions []SessionWithUser
+	sessionTable := conf.Conf.Database.TablePrefix + "sessions"
+	userTable := conf.Conf.Database.TablePrefix + "users"
+	err := db.Table(sessionTable).
+		Select(sessionTable+".user_id, "+sessionTable+".device_key, "+sessionTable+".last_active, "+
+			sessionTable+".status, "+sessionTable+".user_agent, "+sessionTable+".ip, "+userTable+".username").
+		Joins("JOIN "+userTable+" ON "+sessionTable+".user_id = "+userTable+".id").
+		Where(sessionTable+".status = ?", model.SessionActive).
+		Scan(&sessions).Error
+	return sessions, errors.WithStack(err)
+}
+
 func MarkInactive(sessionID string) error {
 	return errors.WithStack(db.Model(&model.Session{}).Where("device_key = ?", sessionID).Update("status", model.SessionInactive).Error)
 }

server/handles/session.go

@@ -10,6 +10,7 @@ import (
 type SessionResp struct {
 	SessionID  string `json:"session_id"`
 	UserID     uint   `json:"user_id,omitempty"`
+	Username   string `json:"username,omitempty"`
 	LastActive int64  `json:"last_active"`
 	Status     int    `json:"status"`
 	UA         string `json:"ua"`
@@ -64,7 +65,7 @@ func EvictMySession(c *gin.Context) {
 }
 
 func ListSessions(c *gin.Context) {
-	sessions, err := db.ListSessions()
+	sessions, err := db.ListSessionsWithUser()
 	if err != nil {
 		common.ErrorResp(c, err, 500)
 		return
@@ -74,6 +75,7 @@ func ListSessions(c *gin.Context) {
 		resp[i] = SessionResp{
 			SessionID:  s.DeviceKey,
 			UserID:     s.UserID,
+			Username:   s.Username,
 			LastActive: s.LastActive,
 			Status:     s.Status,
 			UA:         s.UserAgent,