Initial versioning.

doc/notes/TODO

@@ -26,8 +26,9 @@
 - [D] Messaging SPI
 - [D] Refactor structure and flow
 - [D] Support PUT and PATCH for LDP-NR metadata
-- [W] Hook up Hyrax
 - [D] Reformat documentation
+- [W] Hyrax compliance
+- [W] Versioning
 
 # Alpha 2 TODO
 
@@ -39,6 +40,7 @@
   - [ ] Range
   - [ ] Limit
   - [ ] (PUT) Digest
+  - [ ] Others
 - [ ] Query API
 
 # Alpha 3 TODO
@@ -51,7 +53,6 @@
 # Alpha 4 TODO
 
 - [ ] Full provenance layout
-- [ ] Versioning
 - [ ] AuthN/Z
   - [ ] Authentication
   - [ ] WebAC

lakesuperior/endpoints/ldp.py

@@ -6,19 +6,18 @@ from uuid import uuid4
 
 import arrow
 
-from flask import (Blueprint, current_app, g, make_response, render_template,
+from flask import (
+        Blueprint, current_app, g, make_response, render_template,
         request, send_file)
-from rdflib import Graph
 from rdflib.namespace import RDF, XSD
 from rdflib.term import Literal
-from werkzeug.datastructures import FileStorage
 
 from lakesuperior.dictionaries.namespaces import ns_collection as nsc
 from lakesuperior.dictionaries.namespaces import ns_mgr as nsm
 from lakesuperior.exceptions import *
 from lakesuperior.model.ldpr import Ldpr
 from lakesuperior.model.ldp_nr import LdpNr
-from lakesuperior.model.ldp_rs import Ldpc, LdpDc, LdpIc, LdpRs
+from lakesuperior.model.ldp_rs import LdpRs
 from lakesuperior.toolbox import Toolbox
 
 
@@ -29,7 +28,8 @@ logger = logging.getLogger(__name__)
 # standard fcrepo4. Here, it is under `/ldp` but initially `/rest` can be kept
 # for backward compatibility.
 
-ldp = Blueprint('ldp', __name__, template_folder='templates',
+ldp = Blueprint(
+        'ldp', __name__, template_folder='templates',
         static_url_path='/static', static_folder='../../static')
 
 accept_patch = (
@@ -188,6 +188,21 @@ def post_resource(parent):
     return rsrc.uri, 201, out_headers
 
 
+@ldp.route('/<path:uuid>/fcr:versions', methods=['POST'])
+def post_version(uuid):
+    slug = request.headers.setdefault('slug', None)
+    if not slug:
+        return 'Specify label for version.', 400
+
+    parent_uuid = uuid + '/fcr:versions'
+    try:
+        parent_rsrc = Ldpr.create_version(parent_uuid)
+    except InvalidResourceError as e:
+        return str(e), 409
+    else:
+        return '', 201, {'Location': parent_rsrc.uri}
+
+
 @ldp.route('/<path:uuid>', methods=['PUT'], strict_slashes=False)
 @ldp.route('/<path:uuid>/fcr:metadata', defaults={'force_rdf' : True},
         methods=['PUT'])