From 33b638478a5d4e9d3190ec0130902091817601a0 Mon Sep 17 00:00:00 2001
From: Tom Lazar <tomster@pyfidelity.com>
Date: Sat, 17 Aug 2013 12:24:23 +0200
Subject: assemble a custom pregenerator for static external urls

we split the pattern via urlparse and pass the parts into the pregenerator
such that route_url will behave as expected, mainly by assembling an
appropriate value for ``_app_url``
---
 pyramid/config/routes.py  | 18 ++++++++++++++++++
 pyramid/tests/test_url.py | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/pyramid/config/routes.py b/pyramid/config/routes.py
index c86e4a2dd..f4f9ac888 100644
--- a/pyramid/config/routes.py
+++ b/pyramid/config/routes.py
@@ -1,4 +1,5 @@
 import warnings
+from urlparse import urlparse
 
 from pyramid.interfaces import (
     IRequest,
@@ -387,6 +388,23 @@ class RoutesConfiguratorMixin(object):
         if self.route_prefix:
             pattern = self.route_prefix.rstrip('/') + '/' + pattern.lstrip('/')
 
+        if pregenerator is None:
+          parsed = urlparse(pattern)
+          if parsed.hostname:
+            pattern = parsed.path
+
+            def external_url_pregenerator(request, elements, kw):
+              if '_scheme' in kw and parsed.scheme != kw['_scheme']:
+                scheme = kw['_scheme']
+              elif parsed.scheme:
+                scheme = parsed.scheme
+              else:
+                scheme = request.scheme
+              kw['_app_url'] = '{0}://{1}'.format(scheme, parsed.netloc)
+              return elements, kw
+
+          pregenerator = external_url_pregenerator
+
         mapper = self.get_routes_mapper()
 
         introspectables = []
diff --git a/pyramid/tests/test_url.py b/pyramid/tests/test_url.py
index bf1c514c5..c7b8cfca1 100644
--- a/pyramid/tests/test_url.py
+++ b/pyramid/tests/test_url.py
@@ -1027,6 +1027,41 @@ class Test_current_route_path(unittest.TestCase):
         self.assertEqual(request.elements, ('abc',))
         self.assertEqual(request.kw, {'_anchor':'abc'})
 
+class Test_external_static_url_integration(unittest.TestCase):
+
+    def setUp(self):
+        self.config = testing.setUp()
+
+    def tearDown(self):
+        testing.tearDown()
+
+    def _makeRequest(self):
+        from pyramid.request  import Request
+        return Request.blank('/')
+
+    def test_generate_external_url(self):
+        self.config.add_route('acme', 'https://acme.org/path/{foo}')
+        request = self._makeRequest()
+        request.registry = self.config.registry
+        self.assertEqual(request.route_url('acme', foo='bar'),
+            'https://acme.org/path/bar')
+
+    def test_generate_external_url_without_scheme(self):
+        self.config.add_route('acme', '//acme.org/path/{foo}')
+        request = self._makeRequest()
+        request.registry = self.config.registry
+        self.assertEqual(request.route_url('acme', foo='bar'),
+            'http://acme.org/path/bar')
+
+
+    def test_generate_external_url_with_explicit_scheme(self):
+        self.config.add_route('acme', '//acme.org/path/{foo}')
+        request = self._makeRequest()
+        request.registry = self.config.registry
+        self.assertEqual(request.route_url('acme', foo='bar', _scheme='https'),
+            'https://acme.org/path/bar')
+
+
 class DummyContext(object):
     def __init__(self, next=None):
         self.next = next
-- 
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