Add support for project import/export

Fixes #471

4 files changed, 169 insertions, 1 deletions

diff --git a/docs/gl_objects/projects.rst b/docs/gl_objects/projects.rst
index fdea7aa..6d69295 100644
--- a/docs/gl_objects/projects.rst
+++ b/docs/gl_objects/projects.rst
@@ -180,6 +180,63 @@ Get a list of users for the repository::
     # search for users
     users = p.users.list(search='pattern')
 
+Import / Export
+===============
+
+You can export projects from gitlab, and re-import them to create new projects
+or overwrite existing ones.
+
+Reference
+---------
+
+* v4 API:
+
+  + :class:`gitlab.v4.objects.ProjectExport`
+  + :class:`gitlab.v4.objects.ProjectExportManager`
+  + :attr:`gitlab.v4.objects.Project.exports`
+  + :class:`gitlab.v4.objects.ProjectImport`
+  + :class:`gitlab.v4.objects.ProjectImportManager`
+  + :attr:`gitlab.v4.objects.Project.imports`
+  + :attr:`gitlab.v4.objects.ProjectManager.import_project`
+
+* GitLab API: https://docs.gitlab.com/ce/api/project_import_export.html
+
+Examples
+--------
+
+A project export is an asynchronous operation. To retrieve the archive
+generated by GitLab you need to:
+
+#. Create an export using the API
+#. Wait for the export to be done
+#. Download the result
+
+::
+
+    # Create the export
+    p = gl.projects.get(my_project)
+    export = p.exports.create({})
+
+    # Wait for the 'finished' status
+    export.refresh()
+    while export.export_status != 'finished':
+        time.sleep(1)
+        export.refresh()
+
+    # Download the result
+    with open('/tmp/export.tgz', 'wb') as f:
+        export.download(streamed=True, action=f.write)
+
+Import the project::
+
+    gl.projects.import_project(open('/tmp/export.tgz', 'rb'), 'my_new_project')
+    # Get a ProjectImport object to track the import status
+    project_import = gl.projects.get(output['id'], lazy=True).imports.get()
+    while project_import.import_status != 'finished':
+        time.sleep(1)
+        project_import.refresh()
+
+
 Project custom attributes
 =========================
 
diff --git a/gitlab/mixins.py b/gitlab/mixins.py
index 810a37b..581e3d5 100644
--- a/gitlab/mixins.py
+++ b/gitlab/mixins.py
@@ -83,7 +83,10 @@ class RefreshMixin(object):
             GitlabAuthenticationError: If authentication is not correct
             GitlabGetError: If the server cannot perform the request
         """
-        path = '%s/%s' % (self.manager.path, self.id)
+        if self._id_attr:
+            path = '%s/%s' % (self.manager.path, self.id)
+        else:
+            path = self.manager.path
         server_data = self.manager.gitlab.http_get(path, **kwargs)
         self._update_attrs(server_data)
 
diff --git a/gitlab/v4/objects.py b/gitlab/v4/objects.py
index 2d9a6bf..ac25f1e 100644
--- a/gitlab/v4/objects.py
+++ b/gitlab/v4/objects.py
@@ -2400,6 +2400,53 @@ class ProjectWikiManager(CRUDMixin, RESTManager):
     _list_filters = ('with_content', )
 
 
+class ProjectExport(RefreshMixin, RESTObject):
+    _id_attr = None
+
+    @cli.register_custom_action('ProjectExport')
+    @exc.on_http_error(exc.GitlabGetError)
+    def download(self, streamed=False, action=None, chunk_size=1024, **kwargs):
+        """Download the archive of a project export.
+
+        Args:
+            streamed (bool): If True the data will be processed by chunks of
+                `chunk_size` and each chunk is passed to `action` for
+                reatment
+            action (callable): Callable responsible of dealing with chunk of
+                data
+            chunk_size (int): Size of each chunk
+            **kwargs: Extra options to send to the server (e.g. sudo)
+
+        Raises:
+            GitlabAuthenticationError: If authentication is not correct
+            GitlabGetError: If the server failed to perform the request
+
+        Returns:
+            str: The blob content if streamed is False, None otherwise
+        """
+        path = '/projects/%d/export/download' % self.project_id
+        result = self.manager.gitlab.http_get(path, streamed=streamed,
+                                              **kwargs)
+        return utils.response_content(result, streamed, action, chunk_size)
+
+
+class ProjectExportManager(GetWithoutIdMixin, CreateMixin, RESTManager):
+    _path = '/projects/%(project_id)s/export'
+    _obj_cls = ProjectExport
+    _from_parent_attrs = {'project_id': 'id'}
+    _create_attrs = (tuple(), ('description',))
+
+
+class ProjectImport(RefreshMixin, RESTObject):
+    _id_attr = None
+
+
+class ProjectImportManager(GetWithoutIdMixin, RESTManager):
+    _path = '/projects/%(project_id)s/import'
+    _obj_cls = ProjectImport
+    _from_parent_attrs = {'project_id': 'id'}
+
+
 class Project(SaveMixin, ObjectDeleteMixin, RESTObject):
     _short_print_attr = 'path'
     _managers = (
@@ -2412,10 +2459,12 @@ class Project(SaveMixin, ObjectDeleteMixin, RESTObject):
         ('deployments', 'ProjectDeploymentManager'),
         ('environments', 'ProjectEnvironmentManager'),
         ('events', 'ProjectEventManager'),
+        ('exports', 'ProjectExportManager'),
         ('files', 'ProjectFileManager'),
         ('forks', 'ProjectForkManager'),
         ('hooks', 'ProjectHookManager'),
         ('keys', 'ProjectKeyManager'),
+        ('imports', 'ProjectImportManager'),
         ('issues', 'ProjectIssueManager'),
         ('labels', 'ProjectLabelManager'),
         ('members', 'ProjectMemberManager'),
@@ -2847,6 +2896,41 @@ class ProjectManager(CRUDMixin, RESTManager):
                      'with_issues_enabled', 'with_merge_requests_enabled',
                      'custom_attributes')
 
+    def import_project(self, file, path, namespace=None, overwrite=False,
+                       override_params=None, **kwargs):
+        """Import a project from an archive file.
+
+        Args:
+            file: Data or file object containing the project
+            path (str): Name and path for the new project
+            namespace (str): The ID or path of the namespace that the project
+                will be imported to
+            overwrite (bool): If True overwrite an existing project with the
+                same path
+            override_params (dict): Set the specific settings for the project
+            **kwargs: Extra options to send to the server (e.g. sudo)
+
+        Raises:
+            GitlabAuthenticationError: If authentication is not correct
+            GitlabListError: If the server failed to perform the request
+
+        Returns:
+            dict: A representation of the import status.
+        """
+        files = {
+            'file': ('file.tar.gz', file)
+        }
+        data = {
+            'path': path,
+            'overwrite': overwrite
+        }
+        if override_params:
+            data['override_params'] = override_params
+        if namespace:
+            data['namespace'] = namespace
+        return self.gitlab.http_post('/projects/import', post_data=data,
+                                     files=files, **kwargs)
+
 
 class Runner(SaveMixin, ObjectDeleteMixin, RESTObject):
     pass
diff --git a/tools/python_test_v4.py b/tools/python_test_v4.py
index c11e567..01de5bd 100644
--- a/tools/python_test_v4.py
+++ b/tools/python_test_v4.py
@@ -678,3 +678,27 @@ assert 'Retry later' in error_message
 [current_project.delete() for current_project in projects]
 settings.throttle_authenticated_api_enabled = False
 settings.save()
+
+# project import/export
+ex = admin_project.exports.create({})
+ex.refresh()
+count = 0
+while ex.export_status != 'finished':
+    time.sleep(1)
+    ex.refresh()
+    count += 1
+    if count == 10:
+        raise Exception('Project export taking too much time')
+with open('/tmp/gitlab-export.tgz', 'wb') as f:
+    ex.download(streamed=True, action=f.write)
+
+output = gl.projects.import_project(open('/tmp/gitlab-export.tgz', 'rb'),
+                               'imported_project')
+project_import = gl.projects.get(output['id'], lazy=True).imports.get()
+count = 0
+while project_import.import_status != 'finished':
+    time.sleep(1)
+    project_import.refresh()
+    count += 1
+    if count == 10:
+        raise Exception('Project import taking too much time')