add docs and changelog

changelogs/unreleased/41899-api-endpoint-for-importing-a-project-export.yml

+---
+title: API endpoint for importing a project export
+merge_request: 17025
+author:
+type: added

doc/api/project_import_export.md

+# Project import API
+
+[Introduced][ce-41899] in GitLab 10.6
+
+[Project import/export](../user/project/settings/import_export.md)
+
+## Import a file
+
+```http
+POST /projects/import
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `namespace` | integer/string | no | The ID or path of the namespace that the project will be imported to. Defaults to the user's namespace |
+| `file` | string | yes | The file to be uploaded |
+| `path` | string | yes | Name and path for new project |
+
+To upload a file from your filesystem, use the `--form` argument. This causes
+cURL to post data using the header `Content-Type: multipart/form-data`.
+The `file=` parameter must point to a file on your filesystem and be preceded
+by `@`. For example:
+
+```console
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" -F "path=api-project" -F "file=@/path/to/file" https://gitlab.example.com/api/v4/projects/import
+```
+
+```json
+{
+  "id": 1,
+  "description": null,
+  "name": "api-project",
+  "name_with_namespace": "Administrator / api-project",
+  "path": "api-project",
+  "path_with_namespace": "root/api-project",
+  "created_at": "2018-02-13T09:05:58.023Z",
+  "import_status": "scheduled"
+}
+```
+
+## Import status
+
+Get the status of export.
+
+```http
+GET /projects/:id/import
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `id`      | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+
+```console
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/1/import
+```
+
+Status can be one of `none`, `started`, or `finished`.
+
+```json
+{
+  "id": 1,
+  "description": "Itaque perspiciatis minima aspernatur corporis consequatur.",
+  "name": "Gitlab Test",
+  "name_with_namespace": "Gitlab Org / Gitlab Test",
+  "path": "gitlab-test",
+  "path_with_namespace": "gitlab-org/gitlab-test",
+  "created_at": "2017-08-29T04:36:44.383Z",
+  "import_status": "started"
+}
+```
+
+[ce-41899]: https://gitlab.com/gitlab-org/gitlab-ce/issues/41899

lib/api/project_import.rb

@@ -19,8 +19,8 @@ module API
     resource :projects, requirements: { id: %r{[^/]+} } do
       params do
         requires :path, type: String, desc: 'The new project path and name'
-        optional :namespace, type: String, desc: 'The ID or name of the namespace that the project will be imported into. Defaults to the user namespace.'
         requires :file, type: File, desc: 'The project export file to be imported'
+        optional :namespace, type: String, desc: 'The ID or name of the namespace that the project will be imported into. Defaults to the user namespace.'
       end
       desc 'Get export status' do
         success Entities::ProjectImportStatus