Add group ID validation and error handling (#618)

- Introduced `GroupIdValidationError` to handle invalid group ID formats.
- Added `validate_group_id` function to check that group IDs contain only alphanumeric characters, dashes, or underscores.
- Integrated `validate_group_id` checks in the `Graphiti` class to ensure group IDs are validated during processing.

graphiti_core/errors.py

@@ -73,3 +73,11 @@ class EntityTypeValidationError(GraphitiError):
     def __init__(self, entity_type: str, entity_type_attribute: str):
         self.message = f'{entity_type_attribute} cannot be used as an attribute for {entity_type} as it is a protected attribute name.'
         super().__init__(self.message)
+
+
+class GroupIdValidationError(GraphitiError):
+    """Raised when a group_id contains invalid characters."""
+
+    def __init__(self, group_id: str):
+        self.message = f'group_id "{group_id}" must contain only alphanumeric characters, dashes, or underscores'
+        super().__init__(self.message)

graphiti_core/graphiti.py

@@ -29,7 +29,7 @@ from graphiti_core.driver.neo4j_driver import Neo4jDriver
 from graphiti_core.edges import EntityEdge, EpisodicEdge
 from graphiti_core.embedder import EmbedderClient, OpenAIEmbedder
 from graphiti_core.graphiti_types import GraphitiClients
-from graphiti_core.helpers import DEFAULT_DATABASE, semaphore_gather
+from graphiti_core.helpers import DEFAULT_DATABASE, semaphore_gather, validate_group_id
 from graphiti_core.llm_client import LLMClient, OpenAIClient
 from graphiti_core.nodes import CommunityNode, EntityNode, EpisodeType, EpisodicNode
 from graphiti_core.search.search import SearchConfig, search
@@ -351,6 +351,7 @@ class Graphiti:
             now = utc_now()
 
             validate_entity_types(entity_types)
+            validate_group_id(group_id)
 
             previous_episodes = (
                 await self.retrieve_episodes(
@@ -503,6 +504,8 @@ class Graphiti:
             start = time()
             now = utc_now()
 
+            validate_group_id(group_id)
+
             episodes = [
                 EpisodicNode(
                     name=episode.name,

graphiti_core/helpers.py

@@ -16,6 +16,7 @@ limitations under the License.
 
 import asyncio
 import os
+import re
 from collections.abc import Coroutine
 from datetime import datetime
 
@@ -25,6 +26,8 @@ from neo4j import time as neo4j_time
 from numpy._typing import NDArray
 from typing_extensions import LiteralString
 
+from graphiti_core.errors import GroupIdValidationError
+
 load_dotenv()
 
 DEFAULT_DATABASE = os.getenv('DEFAULT_DATABASE', 'neo4j')
@@ -103,3 +106,29 @@ async def semaphore_gather(
             return await coroutine
 
     return await asyncio.gather(*(_wrap_coroutine(coroutine) for coroutine in coroutines))
+
+
+def validate_group_id(group_id: str) -> bool:
+    """
+    Validate that a group_id contains only ASCII alphanumeric characters, dashes, and underscores.
+
+    Args:
+        group_id: The group_id to validate
+
+    Returns:
+        True if valid, False otherwise
+
+    Raises:
+        GroupIdValidationError: If group_id contains invalid characters
+    """
+
+    # Allow empty string (default case)
+    if not group_id:
+        return True
+
+    # Check if string contains only ASCII alphanumeric characters, dashes, or underscores
+    # Pattern matches: letters (a-z, A-Z), digits (0-9), hyphens (-), and underscores (_)
+    if not re.match(r'^[a-zA-Z0-9_-]+$', group_id):
+        raise GroupIdValidationError(group_id)
+
+    return True