We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Tracker for `RolesFromDomain`
This is to track the implementation of `RolesFromDomain`, which implements role setting depending on the email domain of the user.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `master/buildbot/www/authz/roles.py`
Content:
```
1 # This file is part of Buildbot.  Buildbot is free software: you can
2 # redistribute it and/or modify it under the terms of the GNU General Public
3 # License as published by the Free Software Foundation, version 2.
4 #
5 # This program is distributed in the hope that it will be useful, but WITHOUT
6 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
7 # FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
8 # details.
9 #
10 # You should have received a copy of the GNU General Public License along with
11 # this program; if not, write to the Free Software Foundation, Inc., 51
12 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
13 #
14 # Copyright Buildbot Team Members
15 
16 from __future__ import absolute_import
17 from __future__ import print_function
18 from future.utils import iteritems
19 
20 
21 class RolesFromBase(object):
22 
23     def __init__(self):
24         pass
25 
26     def getRolesFromUser(self, userDetails):
27         return []
28 
29     def setAuthz(self, authz):
30         self.authz = authz
31         self.master = authz.master
32 
33 
34 class RolesFromGroups(RolesFromBase):
35 
36     def __init__(self, groupPrefix=""):
37         RolesFromBase.__init__(self)
38         self.groupPrefix = groupPrefix
39 
40     def getRolesFromUser(self, userDetails):
41         roles = []
42         if 'groups' in userDetails:
43             for group in userDetails['groups']:
44                 if group.startswith(self.groupPrefix):
45                     roles.append(group[len(self.groupPrefix):])
46         return roles
47 
48 
49 class RolesFromEmails(RolesFromBase):
50 
51     def __init__(self, **kwargs):
52         RolesFromBase.__init__(self)
53         self.roles = {}
54         for role, emails in iteritems(kwargs):
55             for email in emails:
56                 self.roles.setdefault(email, []).append(role)
57 
58     def getRolesFromUser(self, userDetails):
59         if 'email' in userDetails:
60             return self.roles.get(userDetails['email'], [])
61         return []
62 
63 
64 class RolesFromOwner(RolesFromBase):
65 
66     def __init__(self, role):
67         RolesFromBase.__init__(self)
68         self.role = role
69 
70     def getRolesFromUser(self, userDetails, owner):
71         if 'email' in userDetails:
72             if userDetails['email'] == owner and owner is not None:
73                 return [self.role]
74         return []
75 
76 
77 class RolesFromUsername(RolesFromBase):
78     def __init__(self, roles, usernames):
79         self.roles = roles
80         if None in usernames:
81             from buildbot import config
82             config.error('Usernames cannot be None')
83         self.usernames = usernames
84 
85     def getRolesFromUser(self, userDetails):
86         if userDetails.get('username') in self.usernames:
87             return self.roles
88         return []
89
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/master/buildbot/www/authz/roles.py b/master/buildbot/www/authz/roles.py
--- a/master/buildbot/www/authz/roles.py
+++ b/master/buildbot/www/authz/roles.py
@@ -61,6 +61,24 @@
         return []
 
 
+class RolesFromDomain(RolesFromEmails):
+
+    def __init__(self, **kwargs):
+        RolesFromBase.__init__(self)
+
+        self.domain_roles = {}
+        for role, domains in iteritems(kwargs):
+            for domain in domains:
+                self.domain_roles.setdefault(domain, []).append(role)
+
+    def getRolesFromUser(self, userDetails):
+        if 'email' in userDetails:
+            email = userDetails['email']
+            edomain = email.split('@')[-1]
+            return self.domain_roles.get(edomain, [])
+        return []
+
+
 class RolesFromOwner(RolesFromBase):
 
     def __init__(self, role):

{"golden_diff": "diff --git a/master/buildbot/www/authz/roles.py b/master/buildbot/www/authz/roles.py\n--- a/master/buildbot/www/authz/roles.py\n+++ b/master/buildbot/www/authz/roles.py\n@@ -61,6 +61,24 @@\n         return []\n \n \n+class RolesFromDomain(RolesFromEmails):\n+\n+    def __init__(self, **kwargs):\n+        RolesFromBase.__init__(self)\n+\n+        self.domain_roles = {}\n+        for role, domains in iteritems(kwargs):\n+            for domain in domains:\n+                self.domain_roles.setdefault(domain, []).append(role)\n+\n+    def getRolesFromUser(self, userDetails):\n+        if 'email' in userDetails:\n+            email = userDetails['email']\n+            edomain = email.split('@')[-1]\n+            return self.domain_roles.get(edomain, [])\n+        return []\n+\n+\n class RolesFromOwner(RolesFromBase):\n \n     def __init__(self, role):\n", "issue": "Tracker for `RolesFromDomain`\nThis is to track the implementation of `RolesFromDomain`, which implements role setting depending on the email domain of the user.\n", "before_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\nfrom __future__ import absolute_import\nfrom __future__ import print_function\nfrom future.utils import iteritems\n\n\nclass RolesFromBase(object):\n\n    def __init__(self):\n        pass\n\n    def getRolesFromUser(self, userDetails):\n        return []\n\n    def setAuthz(self, authz):\n        self.authz = authz\n        self.master = authz.master\n\n\nclass RolesFromGroups(RolesFromBase):\n\n    def __init__(self, groupPrefix=\"\"):\n        RolesFromBase.__init__(self)\n        self.groupPrefix = groupPrefix\n\n    def getRolesFromUser(self, userDetails):\n        roles = []\n        if 'groups' in userDetails:\n            for group in userDetails['groups']:\n                if group.startswith(self.groupPrefix):\n                    roles.append(group[len(self.groupPrefix):])\n        return roles\n\n\nclass RolesFromEmails(RolesFromBase):\n\n    def __init__(self, **kwargs):\n        RolesFromBase.__init__(self)\n        self.roles = {}\n        for role, emails in iteritems(kwargs):\n            for email in emails:\n                self.roles.setdefault(email, []).append(role)\n\n    def getRolesFromUser(self, userDetails):\n        if 'email' in userDetails:\n            return self.roles.get(userDetails['email'], [])\n        return []\n\n\nclass RolesFromOwner(RolesFromBase):\n\n    def __init__(self, role):\n        RolesFromBase.__init__(self)\n        self.role = role\n\n    def getRolesFromUser(self, userDetails, owner):\n        if 'email' in userDetails:\n            if userDetails['email'] == owner and owner is not None:\n                return [self.role]\n        return []\n\n\nclass RolesFromUsername(RolesFromBase):\n    def __init__(self, roles, usernames):\n        self.roles = roles\n        if None in usernames:\n            from buildbot import config\n            config.error('Usernames cannot be None')\n        self.usernames = usernames\n\n    def getRolesFromUser(self, userDetails):\n        if userDetails.get('username') in self.usernames:\n            return self.roles\n        return []\n", "path": "master/buildbot/www/authz/roles.py"}], "after_files": [{"content": "# This file is part of Buildbot.  Buildbot is free software: you can\n# redistribute it and/or modify it under the terms of the GNU General Public\n# License as published by the Free Software Foundation, version 2.\n#\n# This program is distributed in the hope that it will be useful, but WITHOUT\n# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\n# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\n# details.\n#\n# You should have received a copy of the GNU General Public License along with\n# this program; if not, write to the Free Software Foundation, Inc., 51\n# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n#\n# Copyright Buildbot Team Members\n\nfrom __future__ import absolute_import\nfrom __future__ import print_function\nfrom future.utils import iteritems\n\n\nclass RolesFromBase(object):\n\n    def __init__(self):\n        pass\n\n    def getRolesFromUser(self, userDetails):\n        return []\n\n    def setAuthz(self, authz):\n        self.authz = authz\n        self.master = authz.master\n\n\nclass RolesFromGroups(RolesFromBase):\n\n    def __init__(self, groupPrefix=\"\"):\n        RolesFromBase.__init__(self)\n        self.groupPrefix = groupPrefix\n\n    def getRolesFromUser(self, userDetails):\n        roles = []\n        if 'groups' in userDetails:\n            for group in userDetails['groups']:\n                if group.startswith(self.groupPrefix):\n                    roles.append(group[len(self.groupPrefix):])\n        return roles\n\n\nclass RolesFromEmails(RolesFromBase):\n\n    def __init__(self, **kwargs):\n        RolesFromBase.__init__(self)\n        self.roles = {}\n        for role, emails in iteritems(kwargs):\n            for email in emails:\n                self.roles.setdefault(email, []).append(role)\n\n    def getRolesFromUser(self, userDetails):\n        if 'email' in userDetails:\n            return self.roles.get(userDetails['email'], [])\n        return []\n\n\nclass RolesFromDomain(RolesFromEmails):\n\n    def __init__(self, **kwargs):\n        RolesFromBase.__init__(self)\n\n        self.domain_roles = {}\n        for role, domains in iteritems(kwargs):\n            for domain in domains:\n                self.domain_roles.setdefault(domain, []).append(role)\n\n    def getRolesFromUser(self, userDetails):\n        if 'email' in userDetails:\n            email = userDetails['email']\n            edomain = email.split('@')[-1]\n            return self.domain_roles.get(edomain, [])\n        return []\n\n\nclass RolesFromOwner(RolesFromBase):\n\n    def __init__(self, role):\n        RolesFromBase.__init__(self)\n        self.role = role\n\n    def getRolesFromUser(self, userDetails, owner):\n        if 'email' in userDetails:\n            if userDetails['email'] == owner and owner is not None:\n                return [self.role]\n        return []\n\n\nclass RolesFromUsername(RolesFromBase):\n    def __init__(self, roles, usernames):\n        self.roles = roles\n        if None in usernames:\n            from buildbot import config\n            config.error('Usernames cannot be None')\n        self.usernames = usernames\n\n    def getRolesFromUser(self, userDetails):\n        if userDetails.get('username') in self.usernames:\n            return self.roles\n        return []\n", "path": "master/buildbot/www/authz/roles.py"}]}