Allow reading IBAN registry from the command line

arthurdejong · arthurdejong · commit 44575a1826b5 · 2025-05-05T18:20:40.000+02:00
It seems that the Swift website currently uses TLS fingerprinting to
block downloads of the IBAN registry except in certain browsers.

It also fixes an idiosyncrasy in the IBAN registry iteself where the
Norwegian BBAN format string was not correct.
diff --git a/update/iban.py b/update/iban.py
@@ -24,13 +24,16 @@
 the data needed to correctly parse and validate IBANs."""
 
 import csv
+import os.path
+import sys
 from collections import defaultdict
 
 import requests
 
 
 # The place where the current version of
 # swift_standards_infopaper_ibanregistry_1.txt can be downloaded.
+# Linked from https://www.swift.com/standards/data-standards/iban-international-bank-account-number
 download_url = 'https://www.swift.com/node/11971'
 
 
@@ -44,13 +47,20 @@ def get_country_codes(line):
 
 
 if __name__ == '__main__':
-    response = requests.get(download_url, timeout=30)
-    response.raise_for_status()
-    print('# generated from swift_standards_infopaper_ibanregistry_1.txt,')
-    print('# downloaded from %s' % download_url)
+    if len(sys.argv) > 1:
+        f = open(sys.argv[1], 'rt', encoding='iso-8859-15')
+        lines = iter(f)
+        print(f'# generated from {os.path.basename(sys.argv[1])}')
+        print(f'# downloaded from {download_url}')
+    else:
+        response = requests.get(download_url, timeout=30)
+        response.raise_for_status()
+        print('# generated from iban-registry_1.txt')
+        print(f'# downloaded from {download_url}')
+        lines = response.iter_lines(decode_unicode=True)
     values = defaultdict(dict)
     # the file is CSV but the data is in columns instead of rows
-    for row in csv.reader(response.iter_lines(decode_unicode=True), delimiter='\t', quotechar='"'):
+    for row in csv.reader(lines, delimiter='\t', quotechar='"'):
         # skip first row
         if row and row[0] != 'Data element':
             # first column contains label
@@ -66,6 +76,8 @@ def get_country_codes(line):
         cname = data['Name of country']
         if bban.startswith(cc + '2!n'):
             bban = bban[5:]
+        if bban.startswith(cc):
+            bban = bban[2:]
         # print country line
         print('%s country="%s" bban="%s"' % (cc, cname, bban))
         # TODO: some countries have a fixed check digit value
