fix(security): fix plugin update logging and config validation leak

- update_plugin: change logger.exception to logger.error in non-except
  branch (logger.exception outside an except block logs useless
  "NoneType: None" traceback)
- update_plugin: remove duplicate logger.exception call in except block
  (was logging the same failure twice)
- save_plugin_config validation: stop logging full plugin_config dict
  (can contain API keys, passwords, tokens) and raw form_data values;
  log only keys and validation errors instead

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

src/web_interface/errors.py

@@ -254,7 +254,7 @@ class WebInterfaceError:
         exception_name = type(exception).__name__
         
         if "Config" in exception_name:
-            return ErrorCode.CONFIG_SAVE_FAILED
+            return ErrorCode.CONFIG_LOAD_FAILED
         elif "Plugin" in exception_name:
             return ErrorCode.PLUGIN_LOAD_FAILED
         elif "Permission" in exception_name or "Access" in exception_name:

web_interface/blueprints/api_v3.py

@@ -17,6 +17,7 @@ logger = logging.getLogger(__name__)
 # Import new infrastructure
 from src.web_interface.api_helpers import success_response, error_response, validate_request_json
 from src.web_interface.errors import ErrorCode
+from src.exceptions import ConfigError
 from src.plugin_system.operation_types import OperationType
 from src.web_interface.logging_config import log_plugin_operation, log_config_change
 from src.web_interface.validators import (
@@ -440,32 +441,18 @@ def get_dim_schedule_config():
         })
 
         return success_response(data=dim_schedule_config)
-    except FileNotFoundError as e:
-        logger.error(f"[DIM SCHEDULE] Config file not found: {e}", exc_info=True)
+    except ConfigError as e:
+        logger.error(f"[DIM SCHEDULE] Config error: {e}", exc_info=True)
         return error_response(
             ErrorCode.CONFIG_LOAD_FAILED,
-            "Configuration file not found",
-            status_code=500
-        )
-    except json.JSONDecodeError as e:
-        logger.error(f"[DIM SCHEDULE] Invalid JSON in config file: {e}", exc_info=True)
-        return error_response(
-            ErrorCode.CONFIG_LOAD_FAILED,
-            "Configuration file contains invalid JSON",
-            status_code=500
-        )
-    except (IOError, OSError) as e:
-        logger.error(f"[DIM SCHEDULE] Error reading config file: {e}", exc_info=True)
-        return error_response(
-            ErrorCode.CONFIG_LOAD_FAILED,
-            f"Error reading configuration file: {str(e)}",
+            "Configuration file not found or invalid",
             status_code=500
         )
     except Exception as e:
         logger.error(f"[DIM SCHEDULE] Unexpected error loading config: {e}", exc_info=True)
         return error_response(
             ErrorCode.CONFIG_LOAD_FAILED,
-            f"Unexpected error loading dim schedule configuration: {str(e)}",
+            "Unexpected error loading dim schedule configuration",
             status_code=500
         )
 
@@ -654,10 +641,6 @@ def save_main_config():
         if not data:
             return jsonify({'status': 'error', 'message': 'No data provided'}), 400
 
-        logger.error(f"DEBUG: save_main_config received data: {data}")
-        logger.error(f"DEBUG: Content-Type header: {request.content_type}")
-        logger.error(f"DEBUG: Headers: {dict(request.headers)}")
-
         # Merge with existing config (similar to original implementation)
         current_config = api_v3.config_manager.load_config()
 
@@ -1012,7 +995,6 @@ def save_raw_main_config():
     except json.JSONDecodeError as e:
         return jsonify({'status': 'error', 'message': f'Invalid JSON: {str(e)}'}), 400
     except Exception as e:
-        from src.exceptions import ConfigError
         logger.exception("[RawConfig] Failed to save raw main config")
         if isinstance(e, ConfigError):
             return error_response(
@@ -1051,7 +1033,6 @@ def save_raw_secrets_config():
     except json.JSONDecodeError as e:
         return jsonify({'status': 'error', 'message': f'Invalid JSON: {str(e)}'}), 400
     except Exception as e:
-        from src.exceptions import ConfigError
         logger.exception("[RawSecrets] Failed to save raw secrets config")
         if isinstance(e, ConfigError):
             return error_response(
@@ -2738,8 +2719,8 @@ def update_plugin():
                     }
                 )
 
-            logger.exception("[PluginUpdate] Update failed for %s: %s", plugin_id, error_msg)
-            
+            logger.error("[PluginUpdate] Update failed for %s: %s", plugin_id, error_msg)
+
             return error_response(
                 ErrorCode.PLUGIN_UPDATE_FAILED,
                 error_msg,
@@ -2748,8 +2729,7 @@ def update_plugin():
 
     except Exception as e:
         logger.exception("[PluginUpdate] Exception in update_plugin endpoint")
-        
-        logger.exception("[PluginUpdate] Unhandled exception")
+
         from src.web_interface.errors import WebInterfaceError
         error = WebInterfaceError.from_exception(e, ErrorCode.PLUGIN_UPDATE_FAILED)
         if api_v3.operation_history:
@@ -4585,15 +4565,17 @@ def save_plugin_config():
             if not is_valid:
                 # Log validation errors for debugging
                 logger.error(f"Config validation failed for {plugin_id}")
-                logger.error(f"Validation errors: {validation_errors}")
-                logger.error(f"Config that failed: {plugin_config}")
-                logger.error(f"Schema properties: {list(enhanced_schema.get('properties', {}).keys())}")
-
-                # Log raw form data if this was a form submission
+                logger.error(
+                    "[PluginConfig] Validation errors: %s | config keys: %s | schema keys: %s",
+                    validation_errors,
+                    list(plugin_config.keys()),
+                    list(enhanced_schema.get('properties', {}).keys()),
+                )
                 if 'application/json' not in (request.content_type or ''):
-                    form_data = request.form.to_dict()
-                    logger.error("[PluginConfig] Raw form data: %s", json.dumps({k: str(v)[:200] for k, v in form_data.items()}, indent=2))
-                    logger.error("[PluginConfig] Parsed config: %s", json.dumps(plugin_config, indent=2, default=str))
+                    logger.error(
+                        "[PluginConfig] Form field keys: %s",
+                        list(request.form.keys()),
+                    )
                 return error_response(
                     ErrorCode.CONFIG_VALIDATION_FAILED,
                     'Configuration validation failed',