Merge branch 'dcat' into 'v0.9.9'

Add dcat API for stream project.

See merge request !238

gui/src/components/APIs.js

@@ -60,6 +60,15 @@ export default function About() {
       open API standard for materials science databases. This API can be used to search
       and access NOMAD metadata in a standardized way that can also be applied to many
       [other materials science databses](https://providers.optimade.org/).
+
+      ## DCAT
+
+      - [DCAT API dashboard](${appBase}/dcat/)
+
+      [DCAT](https://www.w3.org/TR/vocab-dcat-2/) is a RDF vocabulary designed to facilitate
+      interoperability between data catalogs published on the Web. This API allows you
+      access to NOMAD via RDF documents following DCAT. You can access NOMAD entries as
+      DCAT Datasets or all NOMAD entries as a DCAT Catalog.
     `}</Markdown>
   </div>
 }

gui/src/components/About.js

@@ -19,7 +19,7 @@ import React, { useContext, useLayoutEffect, useRef, useCallback, useEffect, use
 import {ReactComponent as AboutSvg} from './about.svg'
 import PropTypes from 'prop-types'
 import Markdown from './Markdown'
-import { appBase, optimadeBase, apiBase, debug, consent, aitoolkitEnabled, encyclopediaEnabled } from '../config'
+import { appBase, debug, consent, aitoolkitEnabled, encyclopediaEnabled } from '../config'
 import { apiContext } from './api'
 import packageJson from '../../package.json'
 import { domains } from './domains'
@@ -318,20 +318,16 @@ export default function About() {
       </InfoCard>
       <InfoCard xs={4} title="APIs" bottom><Markdown>{`
       The NOMAD can also be accessed programmatically via ReST APIs.
-      There is the proprietary NOMAD API and an implementation of the
-      standardized [OPTiMaDe API (0.10.0)](https://github.com/Materials-Consortia/OPTiMaDe/tree/master)
-      materials science database API.
+      There is the proprietary NOMAD API,an implementation of the
+      standardized [OPTiMaDe API](https://github.com/Materials-Consortia/OPTiMaDe/tree/master)
+      materials science database API, and more.
 
-      Both APIs are described via [swagger/OpenAPI spec.](https://swagger.io/),
-      therefore you can use your favorite swagger client library
-      (e.g. [bravado](https://github.com/Yelp/bravado) for Python):
-      - [NOMAD API](${apiBase}/)
-      - [OPTiMaDe API](${optimadeBase}/)
-
-      There is a [tutorial on how to use the API with plain Python](${appBase}/docs/api_tutorial.html).
+      We offer a [tutorial on how to use the API with plain Python](${appBase}/docs/api_tutorial.html).
       Another [tutorial covers how to install and use NOMAD's Python client library](${appBase}/docs/archive_tutorial.html).
       The [NOMAD Analytics Toolkit](https://nomad-lab.eu/AIToolkit) allows to use
       this without installation and directly on NOMAD servers.
+
+      Visit our [API page](/apis).
       `}</Markdown></InfoCard>
       <Grid item xs={12}>
         <Markdown>{`

nomad/app/__init__.py

@@ -17,8 +17,8 @@
 #
 
 '''
-This module comprises the nomad@FAIRDI APIs. Currently there is NOMAD's official api, and
-we will soon at the optimade api. The app module also servers documentation, gui, and
+This module comprises the nomad@FAIRDI APIs. Currently there is NOMAD's official api, optimade api,
+and dcat api. The app module also servers documentation, gui, and
 alive.
 '''
 from flask import Flask, Blueprint, jsonify, url_for, abort, request, make_response
@@ -37,6 +37,7 @@ from nomad import config, utils as nomad_utils
 
 from .api import blueprint as api_blueprint, api
 from .optimade import blueprint as optimade_blueprint, api as optimade
+from .dcat import blueprint as dcat_blueprint
 from .docs import blueprint as docs_blueprint
 from .dist import blueprint as dist_blueprint
 from .gui import blueprint as gui_blueprint
@@ -112,6 +113,7 @@ CORS(app)
 
 app.register_blueprint(api_blueprint, url_prefix='/api')
 app.register_blueprint(optimade_blueprint, url_prefix='/optimade')
+app.register_blueprint(dcat_blueprint, url_prefix='/dcat')
 app.register_blueprint(docs_blueprint, url_prefix='/docs')
 app.register_blueprint(dist_blueprint, url_prefix='/dist')
 app.register_blueprint(gui_blueprint, url_prefix='/gui')

nomad/app/dcat/__init__.py

+# Copyright 2018 Markus Scheidgen
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an"AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+'''
+The optimade implementation of NOMAD.
+'''
+
+from flask import Blueprint
+from flask_restplus import Api
+
+from .api import blueprint, api
+from .datasets import Dataset
+from .catalog import Catalog

nomad/app/dcat/api.py

+#
+# Copyright The NOMAD Authors.
+#
+# This file is part of NOMAD. See https://nomad-lab.eu for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from flask import Blueprint, Response
+from flask_restplus import Api, reqparse
+import urllib.parse
+from rdflib import Graph
+
+from nomad import config
+
+blueprint = Blueprint('dcat', __name__)
+
+base_url = config.api_url(api='dcat')
+
+
+def url(*args, **kwargs):
+    ''' Returns the full dcat api url for the given path (args) and query (kwargs) parameters. '''
+    url = f'{base_url.rstrip("/")}/{"/".join(args).lstrip("/")}'
+
+    if len(kwargs) > 0:
+        return f'{url}?{urllib.parse.urlencode(kwargs)}'
+    else:
+        return url
+
+
+api = Api(
+    blueprint,
+    version='1.0', title='NOMAD\'s API for servicing dcat resources',
+    description='NOMAD\'s API for serving dcat resources',
+    validate=True)
+
+
+# For some unknown reason it is necessary for each fr api to have a handler.
+# Otherwise the global app error handler won't be called.
+@api.errorhandler(Exception)
+def errorhandler(error):
+    '''When an internal server error is caused by an unexpected exception.'''
+    return str(error)
+
+
+arg_parser = reqparse.RequestParser()
+arg_parser.add_argument('format', type=str, choices=[
+    'xml',
+    'n3',
+    'turtle',
+    'nt',
+    'pretty-xml',
+    'trig'])
+
+
+def rdf_respose(g: Graph) -> Response:
+    args = arg_parser.parse_args()
+    format_ = args.get('format')
+    if format_ is None:
+        format_ = 'pretty-xml'
+    content_type = 'application/xml' if format in ['xml', 'pretty-xml'] else 'text/%s' % format_
+    return Response(
+        g.serialize(format=format_).decode('utf-8'), 200,
+        {'Content-Type': content_type})

nomad/app/dcat/catalog.py

+#
+# Copyright The NOMAD Authors.
+#
+# This file is part of NOMAD. See https://nomad-lab.eu for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from flask_restplus import Resource, fields
+from elasticsearch_dsl import Q
+
+from nomad import search
+
+from .api import api, arg_parser, rdf_respose
+from .mapping import Mapping
+
+ns = api.namespace('catalog', description='The API for DCAT catalog.')
+
+iso8601 = fields.DateTime(dt_format='iso8601')
+
+arg_parser = arg_parser.copy()
+arg_parser.add_argument('after', type=str)
+arg_parser.add_argument(
+    'modified_since', type=lambda x: iso8601.parse(x),
+    help='A yyyy-MM-ddTHH:mm:ss (RFC3339) maximum entry time (e.g. upload time)')
+
+
+@ns.route('/')
+class Catalog(Resource):
+    @api.doc('get_dcat_datasets')
+    @api.expect(arg_parser)
+    @api.produces(['application/xml'])
+    @api.response(404, 'There is no entry with the given id.')
+    @api.response(401, 'This entry is not publically accessible.')
+    @api.response(200, 'Data send', headers={'Content-Type': 'application/xml'})
+    def get(self):
+        ''' Returns a page of DCAT datasets. '''
+
+        args = arg_parser.parse_args()
+        modified_since = args.get('modified_since', None)
+        after = args.get('after', '')
+        if after is None:
+            after = ''
+
+        search_request = search.SearchRequest().owner('public')
+        if modified_since is not None:
+            modified_clause = Q('range', upload_time=dict(gte=modified_since))
+            modified_clause |= Q('range', last_edit=dict(gte=modified_since))
+            modified_clause |= Q('range', last_processing=dict(gte=modified_since))
+            search_request.q &= modified_clause
+
+        es_search = search_request._search.query(search_request.q)
+        if after is not '':
+            es_search = es_search.extra(search_after=[after], sort='calc_id')
+        es_response = es_search.execute()
+
+        mapping = Mapping()
+        mapping.map_catalog(es_response.hits, after, modified_since)
+        return rdf_respose(mapping.g)

nomad/app/dcat/datasets.py

+#
+# Copyright The NOMAD Authors.
+#
+# This file is part of NOMAD. See https://nomad-lab.eu for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from flask_restplus import Resource, abort
+from elasticsearch.exceptions import NotFoundError
+
+from nomad import search
+
+from .api import api, arg_parser, rdf_respose
+from .mapping import Mapping
+
+ns = api.namespace('datasets', description='The API for DCAT datasets.')
+
+
+@ns.route('/<string:entry_id>')
+class Dataset(Resource):
+    @api.doc('get_dcat_dataset')
+    @api.expect(arg_parser)
+    @api.produces(['application/xml'])
+    @api.response(404, 'There is no entry with the given id.')
+    @api.response(401, 'This entry is not publically accessible.')
+    @api.response(200, 'Data send', headers={'Content-Type': 'application/xml'})
+    def get(self, entry_id):
+        ''' Returns a DCAT dataset for a given NOMAD entry id. '''
+        try:
+            entry = search.entry_document.get(entry_id)
+        except NotFoundError:
+            abort(404, message='There is no calculation with id %s' % entry_id)
+
+        if entry.with_embargo or not entry.published:
+            abort(401, message='Not authorized to access %s' % entry_id)
+
+        mapping = Mapping()
+        mapping.map_entry(entry)
+        return rdf_respose(mapping.g)

nomad/app/dcat/mapping.py

+#
+# Copyright The NOMAD Authors.
+#
+# This file is part of NOMAD. See https://nomad-lab.eu for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from rdflib import Graph, Literal, RDF, URIRef, BNode
+from rdflib.namespace import Namespace, DCAT, DCTERMS as DCT, FOAF, RDF
+
+from nomad import config
+from nomad.datamodel import User
+
+from nomad.datamodel import EntryMetadata, User
+
+from .api import url
+
+VCARD = Namespace('http://www.w3.org/2006/vcard/ns#')
+HYDRA = Namespace('http://www.w3.org/ns/hydra/core#')
+
+
+def get_optional_entry_prop(entry, name):
+    try:
+        return entry[name]
+    except KeyError:
+        return 'unavailable'
+
+
+class Mapping():
+    def __init__(self):
+        self.g = Graph()
+        self.g.namespace_manager.bind('rdf', RDF)
+        self.g.namespace_manager.bind('dcat', DCAT)
+        self.g.namespace_manager.bind('dct', DCT)
+        self.g.namespace_manager.bind('vcard', VCARD)
+        self.g.namespace_manager.bind('foaf', FOAF)
+        self.g.namespace_manager.bind('hydra', HYDRA)
+
+        self.persons = {}
+
+    def map_catalog(self, entries, after: str, modified_since):
+        def uri_ref(after):
+            kwargs = dict()
+            if after is not None:
+                kwargs['after'] = after
+            if modified_since is not None:
+                kwargs['modified_since'] = modified_since.strftime('%Y-%m-%d')
+            return URIRef(url('catalog', **kwargs))
+
+        after = after.strip()
+
+        catalog = uri_ref(after=None)
+        self.g.add((catalog, RDF.type, DCAT.Catalog))
+        last_entry = None
+        for entry in entries:
+            self.g.add((catalog, DCT.dataset, self.map_entry(entry, slim=True)))
+            last_entry = entry
+
+        hydra_collection = uri_ref(after)
+        self.g.add((hydra_collection, RDF.type, HYDRA.Collection))
+        self.g.add((hydra_collection, HYDRA.totalItems, Literal(entries.total)))
+        self.g.add((hydra_collection, HYDRA.first, uri_ref('')))
+        if last_entry is not None:
+            self.g.add((hydra_collection, HYDRA.next, uri_ref(last_entry.calc_id)))
+
+        self.g.add((hydra_collection, RDF.type, HYDRA.collection))
+
+    def map_entry(self, entry: EntryMetadata, slim=False):
+        dataset = URIRef(url('datasets', entry.calc_id))
+
+        self.g.add((dataset, RDF.type, DCAT.Dataset))
+        self.g.add((dataset, DCT.identifier, Literal(entry.calc_id)))
+        self.g.add((dataset, DCT.issued, Literal(entry.upload_time)))
+        self.g.add((dataset, DCT.modified, Literal(entry.last_processing)))
+        self.g.add((dataset, DCT.title, Literal(get_optional_entry_prop(entry, 'formula'))))
+        self.g.add((dataset, DCT.description, Literal(get_optional_entry_prop(entry, 'comment'))))
+
+        if slim:
+            return dataset
+
+        self.g.add((dataset, DCAT.landing_page, URIRef('%s/entry/id/%s/%s' % (
+            config.gui_url(), entry.upload_id, entry.calc_id))))
+
+        self.g.add((dataset, DCT.license, URIRef('https://creativecommons.org/licenses/by/4.0/legalcode')))
+        self.g.add((dataset, DCT.language, URIRef('http://id.loc.gov/vocabulary/iso639-1/en')))
+
+        self.g.add((dataset, DCT.publisher, self.map_user(entry.uploader)))
+        for author in entry.authors:
+            self.g.add((dataset, DCT.creator, self.map_user(author)))
+        self.g.add((dataset, DCAT.contactPoint, self.map_contact(entry.uploader)))
+
+        self.g.add((dataset, DCAT.distribution, self.map_distribution(entry, 'api')))
+        self.g.add((dataset, DCAT.distribution, self.map_distribution(entry, 'json')))
+        self.g.add((dataset, DCAT.distribution, self.map_distribution(entry, 'raw')))
+
+        return dataset
+
+    def map_user(self, user: User):
+        person = self.persons.get(user.user_id)
+        if person is not None:
+            return person
+
+        user = User.get(user.user_id)
+        person = BNode()
+
+        self.g.add((person, RDF.type, FOAF.Person))
+        self.g.add((person, FOAF.givenName, Literal(user.first_name)))
+        self.g.add((person, FOAF.familyName, Literal(user.last_name)))
+        self.g.add((person, FOAF.nick, Literal(user.username)))
+        self.g.add((person, FOAF.mbox, URIRef('mailto:%s' % (user.email))))
+
+        self.persons[user.user_id] = person
+
+        return person
+
+    def map_contact(self, user: User):
+        person = self.persons.get(user.user_id)
+        if person is None:
+            person = self.map_user(user)
+
+        user = User.get(user.user_id)
+        self.g.add((person, RDF.type, VCARD.Individual))
+        self.g.add((person, VCARD.givenName, Literal(user.first_name)))
+        self.g.add((person, VCARD.familyName, Literal(user.last_name)))
+        self.g.add((person, VCARD.nickName, Literal(user.username)))
+        self.g.add((person, VCARD.hasEmail, Literal(user.email)))
+        self.g.add((person, VCARD.organizationName, Literal('unavailable' if user.affiliation is None else user.affiliation)))
+        # address = BNode()
+        # self.g.add((address, RDF.type, VCARD.Address))
+        # self.g.add((address, VCARD.street_address, )) # affiliation_address?
+        # self.g.add((address, VCARD.postal_code, )) # affiliation_address?
+        # self.g.add((address, VCARD.country_name, )) # affiliation_address?
+        # self.g.add((address, VCARD.locality, )) # affiliation_address?
+        # self.g.add((address, VCARD.region, )) # affiliation_address?
+        # self.g.add((person, VCARD.hasAddress, address))
+
+        return person
+
+    def map_distribution(self, entry, dist_kind):
+        if dist_kind == 'api':
+            # DataService: API
+            service = BNode()
+            self.g.add((service, RDF.type, DCAT.DataService))
+            self.g.add((service, DCT.title, Literal('NOMAD API')))  # How to include terms from swagger document here?
+            self.g.add((service, DCT.description, Literal('Official NOMAD API')))  # same question
+            self.g.add((service, DCAT.endpointURL, URIRef('https://nomad-lab.eu/prod/rae/api/')))  # config.api_url() ?
+            # not sure if the following needs to be dataset specific:
+            self.g.add((service, DCAT.endpointDescription, URIRef('https://nomad-lab.eu/prod/rae/api/swagger.json')))
+
+            # Distribution over API
+            dist = BNode()
+            self.g.add((dist, DCT.title, Literal('unavailable' if entry.formula is None else entry.formula + '_api')))
+            self.g.add((dist, RDF.type, DCAT.Distribution))
+            self.g.add((dist, DCAT.accessService, service))
+        elif dist_kind == 'json':
+            # Distribution as JSON
+            dist = BNode()
+            self.g.add((dist, RDF.type, DCAT.Distribution))
+            self.g.add((dist, DCT.title, Literal(get_optional_entry_prop(entry, 'formula') + '_json')))
+            self.g.add((dist, DCAT.mediaType, URIRef('https://www.iana.org/assignments/media-types/application/json')))
+            self.g.add((dist, DCAT.packageFormat, URIRef('https://www.iana.org/assignments/media-types/application/zip')))
+            self.g.add((dist, DCAT.downloadURL, URIRef(
+                'http://nomad-lab.eu/prod/rae/api/archive/download?upload_id=%s&calc_id=%s' % (entry.upload_id, entry.calc_id))))
+            self.g.add((dist, DCAT.accessURL, URIRef('%s/entry/id/%s/%s' % (
+                config.gui_url(), entry.upload_id, entry.calc_id))))
+        elif dist_kind == 'raw':
+            # Distribution of the raw data
+            dist = BNode()
+            self.g.add((dist, RDF.type, DCAT.Distribution))
+            self.g.add((dist, DCT.title, Literal(get_optional_entry_prop(entry, 'formula') + '_raw')))
+            self.g.add((dist, DCAT.accessURL, URIRef('https://nomad-lab.eu/prod/rae/api/raw/calc/%s/%s' % (
+                entry.upload_id, entry.calc_id))))
+            self.g.add((dist, DCAT.packageFormat, URIRef('https://www.iana.org/assignments/media-types/application/zip')))
+
+        return dist

nomad/config.py

@@ -173,12 +173,14 @@ tests = NomadConfig(
 )
 
 
-def api_url(ssl: bool = True):
-    return '%s://%s/%s/api' % (
+def api_url(ssl: bool = True, api: str = 'api'):
+    base_url = '%s://%s/%s' % (
         'https' if services.https and ssl else 'http',
         services.api_host.strip('/'),
         services.api_base_path.strip('/'))
 
+    return '%s/%s' % (base_url.strip('/'), api)
+
 
 def gui_url(page: str = None):
     base = api_url(True)[:-3]

requirements.txt

@@ -75,6 +75,7 @@ unidecode
 python-json-logger
 recommonmark
 jinja2
+rdflib
 
 # [dev]
 setuptools

tests/app/test_dcat.py

+#
+# Copyright The NOMAD Authors.
+#
+# This file is part of NOMAD. See https://nomad-lab.eu for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import pytest
+from datetime import datetime
+
+from nomad import infrastructure, config
+from nomad.datamodel import EntryMetadata
+from nomad.app.dcat.mapping import Mapping
+
+from tests.conftest import clear_elastic
+from tests.app.test_app import BlueprintClient
+
+
+@pytest.fixture(scope='session')
+def api(session_client):
+    return BlueprintClient(session_client, '/dcat')
+
+
+@pytest.fixture(scope='module')
+def example_entry(test_user, other_test_user):
+
+    entry = EntryMetadata(
+        calc_id='test-id',
+        upload_id='upload-id',
+        upload_time=datetime.now(),
+        last_processing=datetime.now(),
+        uploader=test_user,
+        coauthors=[other_test_user],
+        comment='this is a calculation comment',
+        formula='H20',
+        published=True)