feat: tailscale integration (#847)

internal/controller/user_controller.go

@@ -47,6 +47,7 @@ func NewUserController(
 	userGroup.POST("/login", controller.loginHandler)
 	userGroup.POST("/logout", controller.logoutHandler)
 	userGroup.POST("/totp", controller.totpHandler)
+	userGroup.POST("/tailscale", controller.tailscaleHandler)
 
 	return controller
 }
@@ -394,3 +395,53 @@ func (controller *UserController) totpHandler(c *gin.Context) {
 		"message": "Login successful",
 	})
 }
+
+func (controller *UserController) tailscaleHandler(c *gin.Context) {
+	context, err := new(model.UserContext).NewFromGin(c)
+
+	if err != nil {
+		controller.log.App.Error().Err(err).Msg("Failed to create user context from request")
+		c.JSON(401, gin.H{
+			"status":  401,
+			"message": "Unauthorized",
+		})
+		return
+	}
+
+	if context.Tailscale == nil {
+		controller.log.App.Warn().Msg("Tailscale login attempt without Tailscale context")
+		c.JSON(401, gin.H{
+			"status":  401,
+			"message": "Unauthorized",
+		})
+		return
+	}
+
+	sessionCookie := repository.Session{
+		Username: context.Tailscale.Username,
+		Name:     context.Tailscale.Name,
+		Email:    context.Tailscale.Email,
+		Provider: "tailscale",
+	}
+
+	cookie, err := controller.auth.CreateSession(c, sessionCookie)
+
+	if err != nil {
+		controller.log.App.Error().Err(err).Str("username", context.GetUsername()).Msg("Failed to create session cookie after successful Tailscale login")
+		c.JSON(500, gin.H{
+			"status":  500,
+			"message": "Internal Server Error",
+		})
+		return
+	}
+
+	http.SetCookie(c.Writer, cookie)
+
+	controller.log.App.Info().Str("username", context.GetUsername()).Msg("Tailscale login successful, login complete")
+	controller.log.AuditLoginSuccess(context.GetUsername(), "tailscale", c.ClientIP())
+
+	c.JSON(200, gin.H{
+		"status":  200,
+		"message": "Login successful",
+	})
+}