From c895f874184371ff5798748b1c7234128ca4b25e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dariusz=20G=C3=B3recki?= <darek.krk@gmail.com>
Date: Fri, 1 Jul 2016 09:42:30 +0100
Subject: ref #2659 public HTTP Basic credentials extraction

---
 pyramid/authentication.py | 77 ++++++++++++++++++++++++++++-------------------
 1 file changed, 46 insertions(+), 31 deletions(-)

diff --git a/pyramid/authentication.py b/pyramid/authentication.py
index 9bf1de62e..95d6a710d 100644
--- a/pyramid/authentication.py
+++ b/pyramid/authentication.py
@@ -1128,7 +1128,7 @@ class BasicAuthAuthenticationPolicy(CallbackAuthenticationPolicy):
 
     def unauthenticated_userid(self, request):
         """ The userid parsed from the ``Authorization`` request header."""
-        credentials = self._get_credentials(request)
+        credentials = extract_http_basic_credentials(request)
         if credentials:
             return credentials[0]
 
@@ -1145,42 +1145,14 @@ class BasicAuthAuthenticationPolicy(CallbackAuthenticationPolicy):
         return [('WWW-Authenticate', 'Basic realm="%s"' % self.realm)]
 
     def callback(self, username, request):
-        # Username arg is ignored.  Unfortunately _get_credentials winds up
+        # Username arg is ignored.  Unfortunately extract_http_basic_credentials winds up
         # getting called twice when authenticated_userid is called.  Avoiding
         # that, however, winds up duplicating logic from the superclass.
-        credentials = self._get_credentials(request)
+        credentials = extract_http_basic_credentials(request)
         if credentials:
             username, password = credentials
             return self.check(username, password, request)
 
-    def _get_credentials(self, request):
-        authorization = request.headers.get('Authorization')
-        if not authorization:
-            return None
-        try:
-            authmeth, auth = authorization.split(' ', 1)
-        except ValueError: # not enough values to unpack
-            return None
-        if authmeth.lower() != 'basic':
-            return None
-
-        try:
-            authbytes = b64decode(auth.strip())
-        except (TypeError, binascii.Error): # can't decode
-            return None
-
-        # try utf-8 first, then latin-1; see discussion in
-        # https://github.com/Pylons/pyramid/issues/898
-        try:
-            auth = authbytes.decode('utf-8')
-        except UnicodeDecodeError:
-            auth = authbytes.decode('latin-1')
-
-        try:
-            username, password = auth.split(':', 1)
-        except ValueError: # not enough values to unpack
-            return None
-        return username, password
 
 class _SimpleSerializer(object):
     def loads(self, bstruct):
@@ -1188,3 +1160,46 @@ class _SimpleSerializer(object):
 
     def dumps(self, appstruct):
         return bytes_(appstruct)
+
+
+def extract_http_basic_credentials(request):
+    """ A helper function for extraction of HTTP Basic credentials
+    from a given `request`.
+
+    ``request``
+        The request object
+    """
+    try:
+        # First try authorization extraction logic from WebOb
+        try:
+            authmeth, auth = request.authorization
+        except AttributeError:  # Probably a DummyRequest
+            authorization = request.headers.get('Authorization')
+            if not authorization:
+                return None
+
+            authmeth, auth = authorization.split(' ', 1)
+    except (ValueError, TypeError):
+        # not enough values to unpack or None is not iterable
+        return None
+
+    if authmeth.lower() != 'basic':
+        return None
+
+    try:
+        authbytes = b64decode(auth.strip())
+    except (TypeError, binascii.Error): # can't decode
+        return None
+
+    # try utf-8 first, then latin-1; see discussion in
+    # https://github.com/Pylons/pyramid/issues/898
+    try:
+        auth = authbytes.decode('utf-8')
+    except UnicodeDecodeError:
+        auth = authbytes.decode('latin-1')
+
+    try:
+        username, password = auth.split(':', 1)
+    except ValueError: # not enough values to unpack
+        return None
+    return username, password
-- 
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