fix(security): add table_name whitelist to prevent SQL injection in table query APIs

The /api/query_table and /api/get_table_columns endpoints accepted arbitrary
table_name values that were interpolated directly into SQL f-strings. Since
api_public is true, any unauthenticated user could exploit this. Now validates
table_name and time_field against TABLES_CONFIG before reaching the database.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mes_dashboard/app.py

@@ -498,6 +498,25 @@ def create_app(config_name: str | None = None) -> Flask:
     # Table Query APIs (for table_data_viewer)
     # ========================================================
 
+    from mes_dashboard.config.tables import TABLES_CONFIG
+
+    _ALLOWED_TABLES: dict[str, dict] = {}
+    for _tables in TABLES_CONFIG.values():
+        for _tbl in _tables:
+            _ALLOWED_TABLES[_tbl['name']] = _tbl
+
+    def _validate_table_request(table_name, time_field=None):
+        """Validate table_name against TABLES_CONFIG whitelist."""
+        if not table_name:
+            return '請指定表名', 400
+        if table_name not in _ALLOWED_TABLES:
+            return '不允許查詢此表', 400
+        if time_field is not None:
+            allowed_time = _ALLOWED_TABLES[table_name].get('time_field')
+            if time_field != allowed_time:
+                return '不允許的時間欄位', 400
+        return None, None
+
     @app.route('/api/query_table', methods=['POST'])
     def query_table():
         """API: query table data with optional column filters."""
@@ -507,8 +526,9 @@ def create_app(config_name: str | None = None) -> Flask:
         time_field = data.get('time_field')
         filters = data.get('filters')
 
-        if not table_name:
+        error, status = _validate_table_request(table_name, time_field)
-            return jsonify({'error': '請指定表名'}), 400
+        if error:
+            return jsonify({'error': error}), status
 
         result = get_table_data(table_name, limit, time_field, filters)
         return jsonify(result)
@@ -519,8 +539,9 @@ def create_app(config_name: str | None = None) -> Flask:
         data = request.get_json()
         table_name = data.get('table_name')
 
-        if not table_name:
+        error, status = _validate_table_request(table_name)
-            return jsonify({'error': '請指定表名'}), 400
+        if error:
+            return jsonify({'error': error}), status
 
         columns = get_table_columns(table_name)
         return jsonify({'columns': columns})

tests/test_api_integration.py

@@ -30,7 +30,7 @@ class TestTableQueryAPIIntegration(unittest.TestCase):
 
         response = self.client.post(
             '/api/get_table_columns',
-            json={'table_name': 'TEST_TABLE'},
+            json={'table_name': 'DWH.DW_MES_LOT_V'},
             content_type='application/json'
         )
 
@@ -51,6 +51,18 @@ class TestTableQueryAPIIntegration(unittest.TestCase):
         data = json.loads(response.data)
         self.assertIn('error', data)
 
+    def test_query_table_rejects_unlisted_table(self):
+        """Query table with table_name not in TABLES_CONFIG should return 400."""
+        response = self.client.post(
+            '/api/query_table',
+            json={'table_name': 'EVIL_TABLE; DROP TABLE --'},
+            content_type='application/json'
+        )
+
+        self.assertEqual(response.status_code, 400)
+        data = json.loads(response.data)
+        self.assertIn('error', data)
+
     @patch('mes_dashboard.app.get_table_data')
     def test_query_table_success(self, mock_get_data):
         """Query table should return JSON with data array."""
@@ -61,7 +73,7 @@ class TestTableQueryAPIIntegration(unittest.TestCase):
 
         response = self.client.post(
             '/api/query_table',
-            json={'table_name': 'TEST_TABLE', 'limit': 100},
+            json={'table_name': 'DWH.DW_MES_LOT_V', 'limit': 100},
             content_type='application/json'
         )
 
@@ -93,7 +105,7 @@ class TestTableQueryAPIIntegration(unittest.TestCase):
         response = self.client.post(
             '/api/query_table',
             json={
-                'table_name': 'TEST_TABLE',
+                'table_name': 'DWH.DW_MES_LOT_V',
                 'limit': 100,
                 'filters': {'STATUS': 'ACTIVE'}
             },
@@ -277,7 +289,7 @@ class TestAPIContentType(unittest.TestCase):
 
         response = self.client.post(
             '/api/get_table_columns',
-            json={'table_name': 'TEST'},
+            json={'table_name': 'DWH.DW_MES_LOT_V'},
             content_type='application/json'
         )