feat: add computer name-based silent login (无感登录)

Implement automatic authentication based on computer name to enable
passwordless login for registered computers with fallback to manual
authentication.

Changes:
- Add SessionManager.login_by_computer_name() for silent login attempt
- Add BIPUsersDAO.authenticate_by_computer_name() for computer name lookup
- Update BIPUsersDAO.create_user() to support optional computer_name parameter
- Update main_ui.py to try silent login before showing login dialog
- Display current computer name in login dialog for user reference

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

auth/session_manager.py

@@ -63,6 +63,28 @@ class SessionManager:
             return True
         return False
 
+    def login_by_computer_name(self) -> bool:
+        """
+        Attempt silent login using computer name
+
+        Returns:
+            True if login successful, False otherwise
+        """
+        import socket
+        from db.bip_users_dao import BIPUsersDAO
+
+        computer_name = socket.gethostname()
+        dao = BIPUsersDAO()
+        user_info = dao.authenticate_by_computer_name(computer_name)
+
+        if user_info:
+            self._current_user = {
+                'username': user_info['username'],
+                'user_type': user_info['user_type']
+            }
+            return True
+        return False
+
     def logout(self):
         """Logout the current user and clear session"""
         self._current_user = None

db/bip_users_dao.py

@@ -49,6 +49,44 @@ class BIPUsersDAO(BaseDAO):
                 }
         return None
 
+    def authenticate_by_computer_name(self, computer_name: str) -> Optional[Dict[str, Any]]:
+        """
+        Authenticate a user using computer name (silent login)
+
+        Args:
+            computer_name: The computer name to authenticate
+
+        Returns:
+            Dict with user info if authentication successful, None otherwise
+            Returns: {id, username, user_type}
+        """
+        table_name = self._convert_sql('[dbo].[BIPUsers]')
+        placeholder = self._get_placeholder()
+
+        # Note: Column name is 'ComputerNmae' (typo in database schema)
+        if self._db_type == DatabaseType.MYSQL:
+            sql = f"""
+            SELECT ID, UserName, UserType
+            FROM {table_name}
+            WHERE ComputerNmae = {placeholder}
+            """
+        else:
+            sql = f"""
+            SELECT [ID], [UserName], [UserType]
+            FROM {table_name}
+            WHERE [ComputerNmae] = {placeholder}
+            """
+
+        with get_connection() as db:
+            results = db.execute_query(sql, (computer_name,))
+            if results:
+                return {
+                    'id': results[0]['ID'],
+                    'username': results[0]['UserName'],
+                    'user_type': results[0]['UserType']
+                }
+        return None
+
     def get_all_users(self) -> List[Dict[str, Any]]:
         """
         Get all users from the database
@@ -84,14 +122,15 @@ class BIPUsersDAO(BaseDAO):
                 for row in results
             ]
 
-    def create_user(self, username: str, password: str, user_type: str) -> bool:
+    def create_user(self, username: str, password: str, user_type: str, computer_name: str = '') -> bool:
         """
-        Create a new user
+        Create a new user with optional computer name for silent login
 
         Args:
             username: The username (must be unique)
             password: The password (plain text for internal tool)
             user_type: User type ('Admin', 'User', or 'Guest')
+            computer_name: Optional computer name for silent login (default: '')
 
         Returns:
             True if successful, False otherwise
@@ -101,19 +140,35 @@ class BIPUsersDAO(BaseDAO):
 
         # 根据数据库类型选择列名格式
         if self._db_type == DatabaseType.MYSQL:
+            if computer_name:
+                sql = f"""
+                INSERT INTO {table_name} (UserName, Password, UserType, ComputerNmae)
+                VALUES ({placeholder}, {placeholder}, {placeholder}, {placeholder})
+                """
+                params = (username, password, user_type, computer_name)
+            else:
                 sql = f"""
                 INSERT INTO {table_name} (UserName, Password, UserType)
                 VALUES ({placeholder}, {placeholder}, {placeholder})
                 """
+                params = (username, password, user_type)
+        else:
+            if computer_name:
+                sql = f"""
+                INSERT INTO {table_name} ([UserName], [Password], [UserType], [ComputerNmae])
+                VALUES ({placeholder}, {placeholder}, {placeholder}, {placeholder})
+                """
+                params = (username, password, user_type, computer_name)
             else:
                 sql = f"""
                 INSERT INTO {table_name} ([UserName], [Password], [UserType])
                 VALUES ({placeholder}, {placeholder}, {placeholder})
                 """
+                params = (username, password, user_type)
 
         try:
             with get_connection() as db:
-                db.execute_update(sql, (username, password, user_type))
+                db.execute_update(sql, params)
                 return True
         except Exception as e:
             print(f"Error creating user: {e}")

gui/login_dialog.py

@@ -1,6 +1,7 @@
 """
 Login Dialog - Modal dialog for user authentication
 """
+import socket
 import tkinter as tk
 from tkinter import ttk, messagebox
 from typing import Optional, Tuple
@@ -37,7 +38,7 @@ class LoginDialog:
         """Create the login dialog UI"""
         self.dialog = tk.Toplevel(self.parent)
         self.dialog.title("ERP 自动化工具 - 登录")
-        self.dialog.geometry("400x250")
+        self.dialog.geometry("400x280")
         self.dialog.resizable(False, False)
 
         # Center the dialog on parent
@@ -52,7 +53,7 @@ class LoginDialog:
         parent_height = self.parent.winfo_height()
 
         dialog_width = 400
-        dialog_height = 250
+        dialog_height = 280
         x = parent_x + (parent_width - dialog_width) // 2
         y = parent_y + (parent_height - dialog_height) // 2
         self.dialog.geometry(f"{dialog_width}x{dialog_height}+{x}+{y}")
@@ -78,7 +79,16 @@ class LoginDialog:
             text="请登录",
             font=('', 16, 'bold')
         )
-        title_label.pack(pady=(0, 20))
+        title_label.pack(pady=(0, 10))
+
+        # Computer name display
+        computer_name_label = ttk.Label(
+            main_frame,
+            text=f"当前计算机: {socket.gethostname()}",
+            font=('', 9),
+            foreground='gray'
+        )
+        computer_name_label.pack(pady=(0, 15))
 
         # Username field
         username_frame = ttk.Frame(main_frame)