From e88dd1c32c2961e0fe40b09c48904451fa1eba9a Mon Sep 17 00:00:00 2001
From: Berker Peksag <berker.peksag@gmail.com>
Date: Sun, 6 Mar 2016 16:16:40 +0200
Subject: Issue #2202: Fix UnboundLocalError in
 AbstractDigestAuthHandler.get_algorithm_impls

Raise ValueError if algorithm is not MD5 or SHA.

Initial patch by Mathieu Dupuy.
---
 Lib/test/test_urllib2.py | 12 +++++++++++-
 Lib/urllib/request.py    |  3 +++
 Misc/NEWS                |  3 +++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_urllib2.py b/Lib/test/test_urllib2.py
index a5281d8..008c751 100644
--- a/Lib/test/test_urllib2.py
+++ b/Lib/test/test_urllib2.py
@@ -13,7 +13,8 @@ import urllib.request
 # proxy config data structure but is testable on all platforms.
 from urllib.request import (Request, OpenerDirector, HTTPBasicAuthHandler,
                             HTTPPasswordMgrWithPriorAuth, _parse_proxy,
-                            _proxy_bypass_macosx_sysconf)
+                            _proxy_bypass_macosx_sysconf,
+                            AbstractDigestAuthHandler)
 from urllib.parse import urlparse
 import urllib.error
 import http.client
@@ -1680,6 +1681,15 @@ class MiscTests(unittest.TestCase):
 
         self.assertRaises(ValueError, _parse_proxy, 'file:/ftp.example.com'),
 
+    def test_unsupported_algorithm(self):
+        handler = AbstractDigestAuthHandler()
+        with self.assertRaises(ValueError) as exc:
+            handler.get_algorithm_impls('invalid')
+        self.assertEqual(
+            str(exc.exception),
+            "Unsupported digest authentication algorithm 'invalid'"
+        )
+
 
 class RequestTests(unittest.TestCase):
     class PutRequest(Request):
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index 4c16518..fc8ef7f 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -1111,6 +1111,9 @@ class AbstractDigestAuthHandler:
         elif algorithm == 'SHA':
             H = lambda x: hashlib.sha1(x.encode("ascii")).hexdigest()
         # XXX MD5-sess
+        else:
+            raise ValueError("Unsupported digest authentication "
+                             "algorithm %r" % algorithm)
         KD = lambda s, d: H("%s:%s" % (s, d))
         return H, KD
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 8257b0f..9a775ac 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -91,6 +91,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #2202: Fix UnboundLocalError in
+  AbstractDigestAuthHandler.get_algorithm_impls.  Initial patch by Mathieu Dupuy.
+
 - Issue #25718: Fixed pickling and copying the accumulate() iterator with
   total is None.
 
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