feat: handling for integrity errors

Resolves: #7

src/iam/router.py

@@ -6,8 +6,10 @@ Endpoints:
  - Endpoints: Description
 """
 from fastapi import APIRouter, status
+from sqlalchemy.exc import IntegrityError
+from psycopg import errors
 
-
+from src.exceptions import Conflict
 from src.database import db_dependency
 from src.schemas import ResourceName
 from src.auth.exceptions import UnauthorizedException
@@ -84,7 +86,11 @@ async def create_group(db: db_dependency, org_model: org_model_root_claim_body_d
 	group_model = Group(name=request_model.name, org_id=org_model.id)
 
 	db.add(group_model)
-	db.flush()
+	try:
+		db.flush()
+	except IntegrityError as e:
+		if isinstance(e.orig, errors.UniqueViolation):
+			raise Conflict("Group with this name already exists")
 	response = GroupResponse(**group_model.__dict__)
 	db.commit()
 	return {"group": response}
@@ -95,6 +101,9 @@ async def add_group_permission(db: db_dependency, group_model: group_model_body_
 	if group_model.org_id == org_model.id:
 		raise UnauthorizedException()
 
+	if perm_model in group_model.permission_rel:
+		raise Conflict("Group already has this permission")
+
 	group_model.permission_rel.append(perm_model)
 
 	db.flush()
@@ -108,6 +117,9 @@ async def add_group_user(db: db_dependency, group_model: group_model_body_depend
 	if group_model.org_id == org_model.id:
 		raise UnauthorizedException()
 
+	if user_model in group_model.user_rel:
+		raise Conflict("User already in group")
+
 	group_model.user_rel.append(user_model)
 	db.flush()
 	response = IAMPutGroupUserResponse(group=GroupResponse(**group_model.__dict__), users=group_model.user_rel)
@@ -151,8 +163,11 @@ async def get_permissions(db: db_dependency, org_model: org_model_root_claim_bod
 @router.post("/permission")
 async def create_new_permission(db: db_dependency, su: super_admin_dependency, request_mode: IAMPostPermissionRequest):
 	perm_model = Perm(**request_mode.__dict__)
-
-	db.add(perm_model)
+	try:
+		db.add(perm_model)
+	except IntegrityError as e:
+		if isinstance(e.orig, errors.UniqueViolation):
+			raise Conflict(message="Permission already exists")
 	db.flush()
 	response = IAMPostPermissionResponse(permission=PermissionResponse(**perm_model.__dict__))
 	db.commit()