support STAC API Transactions

Author: tomkralidis

docs/stac.rst

@@ -41,6 +41,14 @@ STAC support will render links as follows:
 * links that are enclosures will be encoded as STAC assets (in ``assets``)
 * all other links remain as record links (in ``links``)
 
+Transactions
+^^^^^^^^^^^^
+
+STAC Transactions are supported as per the following STAC API specifications:
+
+* `STAC API - Transaction Extension Specification`_.
+* `STAC API - Collection Transaction Extension`_.
+
 Request Examples
 ----------------
 
@@ -106,3 +114,5 @@ Request Examples
   http://localhost:8000/stac/collections/metadata:main/items/{itemId}
 
 .. _`SpatioTemporal Asset Catalog API version v1.0.0`: https://github.com/radiantearth/stac-api-spec
+.. _`STAC API - Transaction Extension Specification`: https://github.com/stac-api-extensions/transaction
+.. _`STAC API - Collection Transaction Extension`: https://github.com/stac-api-extensions/collection-transaction

docs/transactions.rst

@@ -114,5 +114,46 @@ Harvesting
 
 Harvesting is not yet supported via OGC API - Records.
 
+Transactions using STAC API
+===========================
+
+pycsw's STAC API support provides transactional capabilities via the `STAC API - Transaction Extension Specification`_ and `STAC API - Collection Transaction Extension`_ specifications,
+which follows RESTful patterns for insert/update/delete of resources.
+
+Supported Resource Types
+------------------------
+
+STAC Collections, Items and Item Collections are supported via OGC API - Records transactional workflow.  Note that the HTTP ``Content-Type``
+header MUST be set to (i.e. ``application/json``).
+
+Transaction operations
+----------------------
+
+The below examples demonstrate transactional workflow using pycsw's OGC API - Records endpoint:
+
+.. code-block:: bash
+
+   # insert STAC Item
+   curl -v -H "Content-Type: application/json" -XPOST http://localhost:8000/stac/collections/metadata:main/items -d @fooitem.json
+
+   # update STAC Item
+   curl -v -H "Content-Type: application/json" -XPUT http://localhost:8000/stac/collections/metadata:main/items/fooitem -d @fooitem.json
+
+   # delete STAC Item
+   curl -v -XDELETE http://localhost:8000/stac/collections/metadata:main/items/fooitem
+
+   # insert STAC Item Collection
+   curl -v -H "Content-Type: application/json" -XPOST http://localhost:8000/stac/collections/metadata:main/items -d @fooitemcollection.json
+
+   # insert STAC Collection
+   curl -v -H "Content-Type: application/json" -XPOST http://localhost:8000/stac/collections -d @foocollection.json
+
+   # update STAC Collection
+   curl -v -H "Content-Type: application/json" -XPUT http://localhost:8000/stac/collections/foocollection -d @foocollection.json
+
+   # delete STAC Collection
+   curl -v -XDELETE http://localhost:8000/stac/collections/foocollection
 
 .. _`OGC API - Features - Part 4: Create, Replace, Update and Delete`: https://docs.ogc.org/DRAFTS/20-002.html
+.. _`STAC API - Transaction Extension Specification`: https://github.com/stac-api-extensions/transaction
+.. _`STAC API - Collection Transaction Extension`: https://github.com/stac-api-extensions/collection-transaction

pycsw/core/repository.py

@@ -147,6 +147,7 @@ def __init__(self, database, context, app_root=None, table='records', repo_filte
         self.query_mappings = {
             'identifier': self.dataset.identifier,
             'type': self.dataset.type,
+            'typename': self.dataset.typename,
             'parentidentifier': self.dataset.parentidentifier,
             'collections': self.dataset.parentidentifier,
             'updated': self.dataset.insert_date,

pycsw/stac/api.py

@@ -69,7 +69,9 @@
     'https://api.stacspec.org/v1.0.0/item-search#filter',
     'https://api.stacspec.org/v1.0.0/item-search#free-text',
     'https://api.stacspec.org/v1.0.0-rc.1/collection-search',
-    'https://api.stacspec.org/v1.0.0-rc.1/collection-search#free-text'
+    'https://api.stacspec.org/v1.0.0-rc.1/collection-search#free-text',
+    'https://api.stacspec.org/v1.0.0/collections/extensions/transaction',
+    'https://api.stacspec.org/v1.0.0/ogcapi-features/extensions/transaction'
 ]
 
 
@@ -321,11 +323,15 @@ def collection(self, headers_, args, collection='metadata:main'):
         if collection == 'metadata:main':
             collection_info = self.get_collection_info()
         else:
-            virtual_collection = self.repository.query_ids([collection])[0]
-            collection_info = self.get_collection_info(
-                virtual_collection.identifier,
-                dict(title=virtual_collection.title,
+            try:
+                virtual_collection = self.repository.query_ids([collection])[0]
+                collection_info = self.get_collection_info(
+                    virtual_collection.identifier,
+                    dict(title=virtual_collection.title,
                      description=virtual_collection.abstract))
+            except IndexError:
+                return self.get_exception(
+                    404, headers_, 'InvalidParameterValue', 'STAC collection not found')
 
         response = collection_info
         url_base = f"{self.config['server']['url']}/collections/{collection}"
@@ -456,6 +462,11 @@ def item(self, headers_, args, collection, item):
             return self.get_exception(400, headers_, 'InvalidParameterValue', msg)
 
         response = json.loads(response)
+
+        if 'id' not in response:
+            return self.get_exception(
+                    404, headers_, 'InvalidParameterValue', 'item not found')
+
         response = links2stacassets(collection, response)
 
         return self.get_response(status, headers_, response)
@@ -497,6 +508,27 @@ def get_collection_info(self, collection_name: str = 'metadata:main',
             }]
         }
 
+    def manage_collection_item(self, headers_, action='create', item=None, data=None, collection=None):
+        if action == 'create' and 'features' in data:
+            LOGGER.debug('STAC Collection detected')
+
+            for feature in data['features']:
+                data2 = feature
+                if collection is not None:
+                    data2['collection'] = collection
+
+                headers, status, content = super().manage_collection_item(
+                    headers_=headers_, action='create', data=data2)
+
+            return self.get_response(201, headers_, {})
+
+        else:  # default/super
+            if collection is not None:
+                data['collection'] = collection
+
+            return super().manage_collection_item(
+                headers_=headers_, action=action, item=item, data=data)
+
 
 def links2stacassets(collection, record):
     LOGGER.debug('Transforming enclosure links to STAC assets')

pycsw/wsgi_flask.py

@@ -134,8 +134,8 @@ def conformance():
         return get_response(api_.conformance(dict(request.headers), request.args))
 
 
-@BLUEPRINT.route('/collections')
-@BLUEPRINT.route('/stac/collections')
+@BLUEPRINT.route('/collections', methods=['GET', 'POST'])
+@BLUEPRINT.route('/stac/collections', methods=['GET', 'POST'])
 def collections():
     """
     OGC API collections endpoint
@@ -144,13 +144,19 @@ def collections():
     """
 
     if get_api_type(request.url_rule.rule) == 'stac-api':
-        return get_response(stacapi.collections(dict(request.headers), request.args))  # noqa
+        if request.method == 'POST':
+            data = request.get_json(silent=True)
+            return get_response(stacapi.manage_collection_item(dict(request.headers),
+                                'create', data=data))
+        else:
+            return get_response(stacapi.collections(dict(request.headers),
+                                request.args))
     else:
         return get_response(api_.collections(dict(request.headers), request.args))
 
 
-@BLUEPRINT.route('/collections/<collection>')
-@BLUEPRINT.route('/stac/collections/<collection>')
+@BLUEPRINT.route('/collections/<collection>', methods=['GET', 'PUT', 'DELETE'])
+@BLUEPRINT.route('/stac/collections/<collection>', methods=['GET', 'PUT', 'DELETE'])
 def collection(collection='metadata:main'):
     """
     OGC API collection endpoint
@@ -161,8 +167,18 @@ def collection(collection='metadata:main'):
     """
 
     if get_api_type(request.url_rule.rule) == 'stac-api':
-        return get_response(stacapi.collection(dict(request.headers),
-                            request.args, collection))
+        if request.method == 'PUT':
+            return get_response(
+                stacapi.manage_collection_item(
+                    dict(request.headers), 'update', collection,
+                    data=request.get_json(silent=True)))
+        elif request.method == 'DELETE':
+            return get_response(
+                stacapi.manage_collection_item(dict(request.headers),
+                                               'delete', collection))
+        else:
+            return get_response(stacapi.collection(dict(request.headers),
+                                request.args, collection))
     else:
         return get_response(api_.collection(dict(request.headers),
                             request.args, collection))
@@ -200,14 +216,22 @@ def items(collection='metadata:main'):
     :returns: HTTP response
     """
 
-    if request.method == 'POST' and request.content_type not in [None, 'application/json']:  # noqa
+    if all([get_api_type(request.url_rule.rule) == 'ogcapi-records',
+            request.method == 'POST',
+            request.content_type not in [None, 'application/json']]):
+
         data = None
         if request.content_type == 'application/geo+json':  # JSON grammar
             data = request.get_json(silent=True)
         elif 'xml' in request.content_type:  # XML grammar
             data = request.data
+
         return get_response(api_.manage_collection_item(dict(request.headers),
                             'create', data=data))
+    elif request.method == 'POST' and get_api_type(request.url_rule.rule) == 'stac-api':
+        data = request.get_json(silent=True)
+        return get_response(stacapi.manage_collection_item(dict(request.headers),
+                            'create', data=data, collection=collection))
     else:
         if get_api_type(request.url_rule.rule) == 'stac-api':
             return get_response(stacapi.items(dict(request.headers),

tests/functionaltests/suites/oarec/test_oarec_functional.py

@@ -107,7 +107,7 @@ def test_queryables(config):
     assert content['$id'] == 'http://localhost/pycsw/oarec/collections/metadata:main/queryables'  # noqa
     assert content['$schema'] == 'http://json-schema.org/draft/2019-09/schema'
 
-    assert len(content['properties']) == 13
+    assert len(content['properties']) == 14
 
     assert 'geometry' in content['properties']
     assert content['properties']['geometry']['$ref'] == 'https://geojson.org/schema/Polygon.json'  # noqa

tests/functionaltests/suites/oarec/test_oarec_virtual_collections_functional.py

@@ -68,7 +68,7 @@ def test_queryables(config_virtual_collections):
     assert content['$id'] == 'http://localhost/pycsw/oarec/collections/metadata:main/queryables'  # noqa
     assert content['$schema'] == 'http://json-schema.org/draft/2019-09/schema'
 
-    assert len(content['properties']) == 13
+    assert len(content['properties']) == 14
 
     assert 'geometry' in content['properties']
     assert content['properties']['geometry']['$ref'] == 'https://geojson.org/schema/Polygon.json'  # noqa