Add workaround for httpretty incompatibility with requests and pyopenssl

See gabrielfalcao/HTTPretty#242

Patch based on mredar/harvester@228e9c3

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/accounts/tests/test_registration.py

@@ -38,6 +38,10 @@
 
 from weblate.trans.tests.test_views import RegistrationTestMixin
 
+# Workaround for httpretty breakage with pyopenssl
+# pylint: disable=W0612
+import weblate.trans.tests.mypretty  # noqa
+
 REGISTRATION_DATA = {
     'username': 'username',
     'email': 'noreply-weblate@example.org',

weblate/trans/tests/mypretty.py

@@ -0,0 +1,43 @@
+# from : https://github.com/gabrielfalcao/HTTPretty/issues/242
+from httpretty import HTTPretty as OriginalHTTPretty
+
+try:
+    from requests.packages.urllib3.contrib.pyopenssl import inject_into_urllib3, extract_from_urllib3
+    pyopenssl_override = True
+except:
+    pyopenssl_override = False
+
+
+class MyHTTPretty(OriginalHTTPretty):
+    """ pyopenssl monkey-patches the default ssl_wrap_socket() function in the 'requests' library,
+    but this can stop the HTTPretty socket monkey-patching from working for HTTPS requests.
+    Our version extends the base HTTPretty enable() and disable() implementations to undo
+    and redo the pyopenssl monkey-patching, respectively.
+    """
+
+    @classmethod
+    def enable(cls):
+        OriginalHTTPretty.enable()
+        if pyopenssl_override:
+            # Take out the pyopenssl version - use the default implementation
+            extract_from_urllib3()
+
+    @classmethod
+    def disable(cls):
+        OriginalHTTPretty.disable()
+        if pyopenssl_override:
+            # Put the pyopenssl version back in place
+            inject_into_urllib3()
+
+
+# Substitute in our version
+HTTPretty = MyHTTPretty
+
+import httpretty.core
+httpretty.core.httpretty = MyHTTPretty
+
+# May need to set other module-level attributes here, e.g. enable, reset etc,
+# depending on your needs
+import httpretty
+httpretty.httpretty = MyHTTPretty
+httpretty.register_uri = httpretty.register_uri