Add project push rules configuration (#520)

4 files changed, 67 insertions, 5 deletions

diff --git a/docs/gl_objects/projects.rst b/docs/gl_objects/projects.rst
index 0d117c5..ffaeb80 100644
--- a/docs/gl_objects/projects.rst
+++ b/docs/gl_objects/projects.rst
@@ -619,3 +619,37 @@ markdown to reference the uploaded file::
     issue.notes.create({
         "body": "See the [attached file]({})".format(uploaded_file["url"])
     })
+
+Project push rules
+==================
+
+Reference
+---------
+
+* v4 API:
+
+  + :class:`gitlab.v4.objects.ProjectPushRules`
+  + :class:`gitlab.v4.objects.ProjectPushRulesManager`
+  + :attr:`gitlab.v4.objects.Project.pushrules`
+
+* GitLab API: https://docs.gitlab.com/ee/api/projects.html#push-rules
+
+Examples
+---------
+
+Create project push rules (at least one rule is necessary)::
+
+    project.pushrules.create({'deny_delete_tag': True})
+
+Get project push rules (returns None is there are no push rules)::
+
+    pr = project.pushrules.get()
+
+Edit project push rules::
+
+    pr.branch_name_regex = '^(master|develop|support-\d+|release-\d+\..+|hotfix-.+|feature-.+)$'
+    pr.save()
+
+Delete project push rules::
+
+    pr.delete()
diff --git a/gitlab/mixins.py b/gitlab/mixins.py
index 59fcf1b..bd4d8c7 100644
--- a/gitlab/mixins.py
+++ b/gitlab/mixins.py
@@ -66,6 +66,8 @@ class GetWithoutIdMixin(object):
             GitlabGetError: If the server cannot perform the request
         """
         server_data = self.gitlab.http_get(self.path, **kwargs)
+        if server_data is None:
+            return None
         return self._obj_cls(self, server_data)
 
 
@@ -317,9 +319,12 @@ class DeleteMixin(object):
             GitlabAuthenticationError: If authentication is not correct
             GitlabDeleteError: If the server cannot perform the request
         """
-        if not isinstance(id, int):
-            id = id.replace('/', '%2F')
-        path = '%s/%s' % (self.path, id)
+        if id is None:
+            path = self.path
+        else:
+            if not isinstance(id, int):
+                id = id.replace('/', '%2F')
+            path = '%s/%s' % (self.path, id)
         self.gitlab.http_delete(path, **kwargs)
 
 
diff --git a/gitlab/v4/cli.py b/gitlab/v4/cli.py
index 0e50de1..451bec8 100644
--- a/gitlab/v4/cli.py
+++ b/gitlab/v4/cli.py
@@ -143,8 +143,9 @@ def _populate_sub_parser_by_class(cls, sub_parser):
                                            action='store_true')
 
         if action_name == 'delete':
-            id_attr = cls._id_attr.replace('_', '-')
-            sub_parser_action.add_argument("--%s" % id_attr, required=True)
+            if cls._id_attr is not None:
+                id_attr = cls._id_attr.replace('_', '-')
+                sub_parser_action.add_argument("--%s" % id_attr, required=True)
 
         if action_name == "get":
             if gitlab.mixins.GetWithoutIdMixin not in inspect.getmro(cls):
diff --git a/gitlab/v4/objects.py b/gitlab/v4/objects.py
index 856d74a..2db2e39 100644
--- a/gitlab/v4/objects.py
+++ b/gitlab/v4/objects.py
@@ -2459,6 +2459,27 @@ class ProjectPipelineScheduleManager(CRUDMixin, RESTManager):
                      ('description', 'ref', 'cron', 'cron_timezone', 'active'))
 
 
+class ProjectPushRules(SaveMixin, ObjectDeleteMixin, RESTObject):
+    _id_attr = None
+
+
+class ProjectPushRulesManager(GetWithoutIdMixin, CreateMixin, UpdateMixin,
+                              DeleteMixin, RESTManager):
+    _path = '/projects/%(project_id)s/push_rule'
+    _obj_cls = ProjectPushRules
+    _from_parent_attrs = {'project_id': 'id'}
+    _create_attrs = (tuple(),
+                     ('deny_delete_tag', 'member_check',
+                      'prevent_secrets', 'commit_message_regex',
+                      'branch_name_regex', 'author_email_regex',
+                      'file_name_regex', 'max_file_size'))
+    _update_attrs = (tuple(),
+                     ('deny_delete_tag', 'member_check',
+                      'prevent_secrets', 'commit_message_regex',
+                      'branch_name_regex', 'author_email_regex',
+                      'file_name_regex', 'max_file_size'))
+
+
 class ProjectSnippetNoteAwardEmoji(ObjectDeleteMixin, RESTObject):
     pass
 
@@ -2887,6 +2908,7 @@ class Project(SaveMixin, ObjectDeleteMixin, RESTObject):
         ('pipelines', 'ProjectPipelineManager'),
         ('protectedbranches', 'ProjectProtectedBranchManager'),
         ('pipelineschedules', 'ProjectPipelineScheduleManager'),
+        ('pushrules', 'ProjectPushRulesManager'),
         ('runners', 'ProjectRunnerManager'),
         ('services', 'ProjectServiceManager'),
         ('snippets', 'ProjectSnippetManager'),