Colin Watson has proposed merging 
lp:~cjwatson/launchpad/git-xmlrpc-auth-params-cleanup into lp:launchpad.

Commit message:
Remove old-style authentication parameters handling from GitAPI.translatePath.

Requested reviews:
  Launchpad code reviewers (launchpad-reviewers)

For more details, see:
https://code.launchpad.net/~cjwatson/launchpad/git-xmlrpc-auth-params-cleanup/+merge/308494

The corresponding turnip changes are on production now, so we can drop the 
compatibility code.
-- 
Your team Launchpad code reviewers is requested to review the proposed merge of 
lp:~cjwatson/launchpad/git-xmlrpc-auth-params-cleanup into lp:launchpad.
=== modified file 'lib/lp/code/xmlrpc/git.py'
--- lib/lp/code/xmlrpc/git.py	2016-10-12 12:41:25 +0000
+++ lib/lp/code/xmlrpc/git.py	2016-10-14 11:51:45 +0000
@@ -295,20 +295,9 @@
             else:
                 raise
 
-    def translatePath(self, path, permission, requester_id,
-                      can_authenticate=None):
+    def translatePath(self, path, permission, auth_params):
         """See `IGitAPI`."""
-        if can_authenticate is None:
-            # XXX cjwatson 2016-10-06: Ugly compatibility hack.  This method
-            # should be "translatePath(self, path, permission, *auth_args)"
-            # instead, but it may be called using mapply which doesn't
-            # support the *auth_args syntax.  This can go away once turnip
-            # uses the new-style interface.
-            auth_params = requester_id
-            requester_id = auth_params.get("uid")
-        else:
-            auth_params = {
-                "uid": requester_id, "can-authenticate": can_authenticate}
+        requester_id = auth_params.get("uid")
         if requester_id is None:
             requester_id = LAUNCHPAD_ANONYMOUS
         if isinstance(path, str):

=== modified file 'lib/lp/code/xmlrpc/tests/test_git.py'
--- lib/lp/code/xmlrpc/tests/test_git.py	2016-10-12 12:30:13 +0000
+++ lib/lp/code/xmlrpc/tests/test_git.py	2016-10-14 11:51:45 +0000
@@ -6,10 +6,6 @@
 __metaclass__ = type
 
 from pymacaroons import Macaroon
-from testscenarios import (
-    load_tests_apply_scenarios,
-    WithScenarios,
-    )
 from zope.component import getUtility
 from zope.security.proxy import removeSecurityProxy
 
@@ -47,34 +43,21 @@
 from lp.xmlrpc import faults
 
 
-class TestGitAPIMixin(WithScenarios):
+class TestGitAPIMixin:
     """Helper methods for `IGitAPI` tests, and security-relevant tests."""
 
-    scenarios = [
-        ("auth_params_flat", {"auth_params_dict": False}),
-        ("auth_params_dict", {"auth_params_dict": True}),
-        ]
-
     def setUp(self):
         super(TestGitAPIMixin, self).setUp()
         self.git_api = GitAPI(None, None)
         self.hosting_fixture = self.useFixture(GitHostingFixture())
         self.repository_set = getUtility(IGitRepositorySet)
 
-    def _translatePath(self, path, permission, auth_params):
-        if self.auth_params_dict:
-            return self.git_api.translatePath(path, permission, auth_params)
-        else:
-            return self.git_api.translatePath(
-                path, permission, auth_params.get("uid"),
-                auth_params.get("can-authenticate", False))
-
     def assertGitRepositoryNotFound(self, requester, path, permission="read",
                                     can_authenticate=False):
         """Assert that the given path cannot be translated."""
         if requester is not None:
             requester = requester.id
-        fault = self._translatePath(
+        fault = self.git_api.translatePath(
             path, permission,
             {"uid": requester, "can-authenticate": can_authenticate})
         self.assertEqual(
@@ -90,7 +73,7 @@
         auth_params = {"uid": requester, "can-authenticate": can_authenticate}
         if macaroon_raw is not None:
             auth_params["macaroon"] = macaroon_raw
-        fault = self._translatePath(path, permission, auth_params)
+        fault = self.git_api.translatePath(path, permission, auth_params)
         self.assertEqual(faults.PermissionDenied(message), fault)
 
     def assertUnauthorized(self, requester, path,
@@ -99,7 +82,7 @@
         """Assert that looking at the given path returns Unauthorized."""
         if requester is not None:
             requester = requester.id
-        fault = self._translatePath(
+        fault = self.git_api.translatePath(
             path, permission,
             {"uid": requester, "can-authenticate": can_authenticate})
         self.assertEqual(faults.Unauthorized(message), fault)
@@ -109,7 +92,7 @@
         """Assert that looking at the given path returns NotFound."""
         if requester is not None:
             requester = requester.id
-        fault = self._translatePath(
+        fault = self.git_api.translatePath(
             path, permission,
             {"uid": requester, "can-authenticate": can_authenticate})
         self.assertEqual(faults.NotFound(message), fault)
@@ -121,7 +104,7 @@
         InvalidSourcePackageName."""
         if requester is not None:
             requester = requester.id
-        fault = self._translatePath(
+        fault = self.git_api.translatePath(
             path, permission,
             {"uid": requester, "can-authenticate": can_authenticate})
         self.assertEqual(faults.InvalidSourcePackageName(name), fault)
@@ -131,7 +114,7 @@
         """Assert that looking at the given path returns InvalidBranchName."""
         if requester is not None:
             requester = requester.id
-        fault = self._translatePath(
+        fault = self.git_api.translatePath(
             path, permission,
             {"uid": requester, "can-authenticate": can_authenticate})
         self.assertEqual(faults.InvalidBranchName(Exception(message)), fault)
@@ -141,7 +124,7 @@
         """Assert that looking at the given path OOPSes."""
         if requester is not None:
             requester = requester.id
-        fault = self._translatePath(
+        fault = self.git_api.translatePath(
             path, permission,
             {"uid": requester, "can-authenticate": can_authenticate})
         self.assertIsInstance(fault, faults.OopsOccurred)
@@ -159,7 +142,7 @@
         auth_params = {"uid": requester, "can-authenticate": can_authenticate}
         if macaroon_raw is not None:
             auth_params["macaroon"] = macaroon_raw
-        translation = self._translatePath(path, permission, auth_params)
+        translation = self.git_api.translatePath(path, permission, auth_params)
         login(ANONYMOUS)
         self.assertEqual(
             {"path": repository.getInternalPath(), "writable": writable,
@@ -172,7 +155,7 @@
             requester_id = requester
         else:
             requester_id = requester.id
-        translation = self._translatePath(
+        translation = self.git_api.translatePath(
             path, "write",
             {"uid": requester_id, "can-authenticate": can_authenticate})
         login(ANONYMOUS)
@@ -666,15 +649,9 @@
             None, path, permission="write", macaroon_raw=macaroons[0])
         with celebrity_logged_in("vcs_imports"):
             getUtility(ICodeImportJobWorkflow).startJob(jobs[0], machine)
-        # This only works with new-style passing of authentication parameters.
-        if self.auth_params_dict:
-            self.assertTranslates(
-                None, path, code_imports[0].git_repository, True,
-                permission="write", macaroon_raw=macaroons[0].serialize())
-        else:
-            self.assertPermissionDenied(
-                None, path, permission="write",
-                macaroon_raw=macaroons[0].serialize())
+        self.assertTranslates(
+            None, path, code_imports[0].git_repository, True,
+            permission="write", macaroon_raw=macaroons[0].serialize())
         self.assertPermissionDenied(
             None, path, permission="write",
             macaroon_raw=macaroons[1].serialize())
@@ -747,6 +724,3 @@
     """
 
     layer = AppServerLayer
-
-
-load_tests = load_tests_apply_scenarios

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