Feature/nat 329 interface names should validated 3

gso/utils/helpers.py

@@ -75,9 +75,9 @@ def available_interfaces_choices(router_id: UUID, speed: str) -> Choice | None:
 
 
 def available_interfaces_choices_including_current_members(
-    router_id: UUID,
-    speed: str,
-    interfaces: list[IptrunkInterfaceBlock],
+        router_id: UUID,
+        speed: str,
+        interfaces: list[IptrunkInterfaceBlock],
 ) -> Choice | None:
     """Return a list of available interfaces for a given router and speed including the current members.
 
@@ -263,3 +263,31 @@ class BaseSiteValidatorModel(BaseModel):
         """
         validate_site_name(site_name)
         return site_name
+
+
+def validate_interface_name_list(interface_name_list: list) -> list:
+    """Validate that the provided interface name matches the expected pattern.
+
+    The expected pattern for the interface name is one of 'ge', 'et', 'xe' followed by a dash '-',
+    then a digit between 0 and 9, a forward slash '/', another digit between 0 and 9,
+    another forward slash '/', and ends with a digit between 0 and 9.
+    For example: 'xe-1/0/0'.
+
+    Args:
+    ----
+    interface_name_list: List of interface names to validate.
+
+    Returns:
+    -------
+    list: The list of interface names if all match was successfull.
+                 Otherwise it will throw a ValueError exception.
+    """
+    pattern = re.compile(r"^(ge|et|xe)-[0-9]/[0-9]/[0-9]$")
+    for interface_name in interface_name_list:
+        if not bool(pattern.match(interface_name)):
+            error_msg = (
+                f"Invalid interface name. The interface name should be of format: "
+                f"xe-1/0/0. Got: [{interface_name}]")
+            raise ValueError(error_msg)
+
+    return interface_name_list