From 17384c524eb6afe9a59927d126a4af0194e5bb38 Mon Sep 17 00:00:00 2001
From: Brian Tiemann <btman@mac.com>
Date: Thu, 24 Apr 2025 15:32:03 -0400
Subject: [PATCH] Management command for fetching UN/LOCODE data and
 regenerating the values for UN_LOCODE ChoiceSet

---
 .../management/commands/refresh_un_locode.py  | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 netbox/extras/management/commands/refresh_un_locode.py

diff --git a/netbox/extras/management/commands/refresh_un_locode.py b/netbox/extras/management/commands/refresh_un_locode.py
new file mode 100644
index 000000000..92ac61821
--- /dev/null
+++ b/netbox/extras/management/commands/refresh_un_locode.py
@@ -0,0 +1,75 @@
+import csv
+import os
+import pprint
+from urllib.request import urlopen
+from io import BytesIO
+from zipfile import ZipFile
+
+from django.core.management.base import BaseCommand
+
+from extras.data.iso_3166 import ISO_3166
+
+
+class Command(BaseCommand):
+    help = "Import UN/LOCODE codes from the UNECE source data set and regenerate UN_LOCODES ChoiceSet values"
+    subdivisions = {}
+    countries = {}
+    code_list = []
+    subdivisions_file = None
+    code_list_files = []
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--url',
+            help="URL of CSV file archive (.zip) to download",
+            dest='url',
+            required=True,
+        )
+        parser.add_argument(
+            '--extract-to',
+            help="Directory to extract unzipped CSV files to (will create if necessary)",
+            dest='extract_to',
+            default=".",
+        )
+
+    def handle(self, *args, **options):
+        url = options['url']
+        extract_to = options['extract_to']
+
+        http_response = urlopen(url)
+        zipfile = ZipFile(BytesIO(http_response.read()))
+        zipfile.extractall(path=extract_to)
+
+        for country_code, country_name in ISO_3166:
+            self.countries[country_code] = country_name[4:-1]
+
+        for file in sorted(os.listdir(extract_to)):
+            if "SubdivisionCodes" in file:
+                self.subdivisions_file = os.path.join(extract_to, file)
+            elif "CodeList" in file:
+                self.code_list_files.append(os.path.join(extract_to, file))
+
+        with open(self.subdivisions_file, mode='r', encoding='cp1252') as csvfile:
+            reader = csv.reader(csvfile)
+            for row in reader:
+                key = f"{row[0]}-{row[1]}"
+                self.subdivisions[key] = row[2]
+
+        locodes = []
+        for code_list_file in self.code_list_files:
+            with open(code_list_file, mode='r', encoding='cp1252') as csvfile:
+                reader = csv.reader(csvfile)
+                for row in reader:
+                    if not row[2]:
+                        continue
+                    key = f"{row[1]}-{row[2]}"
+                    subdivision_key = f"{row[1]}-{row[5]}"
+                    value_str = row[3]
+                    if subdivision := self.subdivisions.get(subdivision_key, ""):
+                        value_str = f"{value_str}, {subdivision}"
+                    country = self.countries.get(row[1])
+                    value_str = f"{value_str}, {country}"
+                    value = f"{key} ({value_str})"
+                    locodes.append((key, value))
+
+        pprint.pprint(tuple(locodes))