Feature/nat 329 interface names should validated 3

gso/utils/helpers.py

@@ -219,3 +219,36 @@ def validate_site_name(site_name: str) -> str:
         )
         raise ValueError(msg)
     return site_name
+
+
+def validate_interface_name_list(interface_name_list: list, vendor: str) -> 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.
+    vendor: Router vendor to check interface names
+
+    Returns:
+    -------
+    list: The list of interface names if all match was successfull.
+                 Otherwise it will throw a ValueError exception.
+    """
+    # For Nokia nothing to do
+    if vendor == RouterVendor.NOKIA:
+        return interface_name_list
+    pattern = re.compile(r"^(ge|et|xe)-[0-9]/[0-9]/[0-9]$")
+    for interface in interface_name_list:
+        if not bool(pattern.match(interface.interface_name)):
+            error_msg = (
+                        f"Invalid interface name. The interface name should be of format: "
+                        f"xe-1/0/0. Got: [{interface.interface_name}]")
+            raise ValueError(error_msg)
+
+
+    return interface_name_list