Use a separate function to validate IP address

CURA-6483

cura/Utils/QtUtil.py

@@ -0,0 +1,21 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Optional
+
+from PyQt5.QtCore import QObject, pyqtSlot
+
+from . import networking
+
+
+#
+# Exposes the util functions to QML using a QObject.
+#
+class QtUtil(QObject):
+
+    def __init__(self, parent: Optional["QObject"] = None) -> None:
+        super().__init__(parent = parent)
+
+    @pyqtSlot(str, result = bool)
+    def isValidIP(self, address: str) -> bool:
+        return networking.isValidIP(address)

cura/Utils/networking.py

@@ -0,0 +1,26 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import re
+
+
+_REGEX_IPV4 = re.compile(r"^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$")
+_REGEX_IPV6 = re.compile(r"^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$")
+
+
+# Checks if the given string is a valid IPv4 address.
+def isIPv4(address: str) -> bool:
+    return _REGEX_IPV4.fullmatch(address) is not None
+
+
+# Checks if the given string is a valid IPv6 address.
+def isIPv6(address: str) -> bool:
+    return _REGEX_IPV6.fullmatch(address) is not None
+
+
+# Checks if the given string is a valid IPv4 or IPv6 address.
+def isValidIP(address: str) -> bool:
+    return isIPv4(address) or isIPv6(address)
+
+
+__all__ = ["isIPv4", "isIPv6", "isValidIP"]