Handle 404 error on key get api call

multischleuder/api.py

@@ -3,8 +3,10 @@ from typing import List, Optional
 
 import base64
 import json
+import logging
 import os
 import ssl
+import urllib.error
 import urllib.request
 
 from multischleuder.types import SchleuderKey, SchleuderList, SchleuderSubscriber
@@ -129,8 +131,12 @@ class SchleuderApi:
 
     # Key Management
 
-    def get_key(self, fpr: str, schleuder: SchleuderList) -> SchleuderKey:
-        key = self.__request('keys/{}.json', list_id=schleuder.id, fmt=[fpr])
+    def get_key(self, fpr: str, schleuder: SchleuderList) -> Optional[SchleuderKey]:
+        try:
+            key = self.__request('keys/{}.json', list_id=schleuder.id, fmt=[fpr])
+        except urllib.error.HTTPError as e:
+            logging.exception(e)
+            return None
         return SchleuderKey.from_api(schleuder.id, **key)
 
     def post_key(self, key: SchleuderKey, schleuder: SchleuderList):

multischleuder/test/test_api.py

@@ -1,5 +1,6 @@
 
 import unittest
+import urllib.error
 from datetime import datetime
 from unittest.mock import patch, MagicMock
 
@@ -111,7 +112,7 @@ _KEY_RESPONSE = '''
 
 class TestSchleuderApi(unittest.TestCase):
 
-    def _mock_api(self, mock, nokey=False):
+    def _mock_api(self, mock, nokey=False, error=None):
         m = MagicMock()
         m.getcode.return_value = 200
 
@@ -133,8 +134,14 @@ class TestSchleuderApi(unittest.TestCase):
         m.read = read
         m.__enter__.return_value = m
         mock.return_value = m
-        return SchleuderApi('https://localhost:4443',
-                            '86cf2676d065dc902548e563ab22b57868ed2eb6')
+        api = SchleuderApi('https://localhost:4443',
+                           '86cf2676d065dc902548e563ab22b57868ed2eb6')
+        if error is not None:
+            def __request(*args, **kwargs):
+                raise error
+            api._SchleuderApi__request = __request
+
+        return api
 
     @patch('urllib.request.urlopen')
     def test_get_lists(self, mock):
@@ -282,6 +289,13 @@ class TestSchleuderApi(unittest.TestCase):
         self.assertEqual(42, key.schleuder)
         self.assertIn('-----BEGIN PGP PUBLIC KEY BLOCK-----', key.blob)
 
+    @patch('urllib.request.urlopen')
+    def test_get_key_404(self, mock):
+        url = 'https://localhost:4443/keys/ADB9BC679FF53CC8EF66FAC39348FDAB7A7663FA.json?list_id=42'
+        api = self._mock_api(mock, error=urllib.error.HTTPError(url=url, code=404, msg='Not Found', hdrs={}, fp=None))
+        key = api.get_key('ADB9BC679FF53CC8EF66FAC39348FDAB7A7663FA', SchleuderList(42, '', ''))
+        self.assertIsNone(key)
+
     @patch('urllib.request.urlopen')
     def test_post_key(self, mock):
         api = self._mock_api(mock)