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views.py
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views.py
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# -*- coding: utf8 -*-
'''
This module contains the pyramid views that expose services.
'''
from __future__ import unicode_literals
from pyramid.view import view_config, view_defaults
from pyramid.compat import ascii_native_
from pyramid.httpexceptions import (
HTTPNotFound
)
from pyramid_skosprovider.utils import (
parse_range_header
)
import logging
log = logging.getLogger(__name__)
class RestView(object):
def __init__(self, request):
self.request = request
self.skos_registry = self.request.skos_registry
@view_defaults(renderer='skosjson', accept='application/json')
class ProviderView(RestView):
'''
A set of views that expose information from a certain provider.
'''
@view_config(route_name='skosprovider.uri', request_method='GET')
def get_uri(self):
uri = self.request.matchdict['uri']
provider = self.skos_registry.get_provider(uri)
if provider:
return {
'type': 'concept_scheme',
'uri': provider.concept_scheme.uri,
'id': provider.get_vocabulary_id()
}
c = self.skos_registry.get_by_uri(uri)
if c:
return {
'type': c.type,
'uri': c.uri,
'id': c.id,
'concept_scheme': {
'uri': c.concept_scheme.uri,
'id': self.skos_registry.get_provider(c.concept_scheme.uri).get_vocabulary_id()
}
}
if not c:
return HTTPNotFound()
@view_config(route_name='skosprovider.conceptschemes', request_method='GET')
def get_conceptschemes(self):
language = self.request.params.get('language', self.request.locale_name)
return [
{
'id': p.get_vocabulary_id(),
'uri': p.concept_scheme.uri,
'label': p.concept_scheme.label(language).label if p.concept_scheme.label(language) else None,
'subject': p.metadata['subject'] if p.metadata['subject'] else []
} for p in self.skos_registry.get_providers()
]
@view_config(route_name='skosprovider.conceptscheme', request_method='GET')
def get_conceptscheme(self):
scheme_id = self.request.matchdict['scheme_id']
provider = self.skos_registry.get_provider(scheme_id)
if not provider:
return HTTPNotFound()
language = self.request.params.get('language', self.request.locale_name)
return {
'id': provider.get_vocabulary_id(),
'uri': provider.concept_scheme.uri,
'label': provider.concept_scheme.label(language).label if provider.concept_scheme.label(language) else None,
'subject': provider.metadata['subject'] if provider.metadata['subject'] else [],
'labels': provider.concept_scheme.labels,
'notes': provider.concept_scheme.notes
}
@view_config(route_name='skosprovider.conceptscheme.tc', request_method='GET')
def get_conceptscheme_top_concepts(self):
scheme_id = self.request.matchdict['scheme_id']
provider = self.skos_registry.get_provider(scheme_id)
if not provider:
return HTTPNotFound()
language = self.request.params.get('language', self.request.locale_name)
return provider.get_top_concepts(language=language)
@view_config(route_name='skosprovider.conceptscheme.display_top', request_method='GET')
def get_conceptscheme_display_top(self):
scheme_id = self.request.matchdict['scheme_id']
provider = self.skos_registry.get_provider(scheme_id)
if not provider:
return HTTPNotFound()
language = self.request.params.get('language', self.request.locale_name)
return provider.get_top_display(language=language)
@view_config(route_name='skosprovider.cs', request_method='GET')
def get_concepts(self):
query = {}
mode = self.request.params.get('mode', 'default')
label = self.request.params.get('label', None)
postprocess = False
language = self.request.params.get('language', self.request.locale_name)
if mode == 'dijitFilteringSelect' and label == '':
concepts = []
else:
if label not in [None, '*', '']:
if mode == 'dijitFilteringSelect' and '*' in label:
postprocess = True
query['label'] = label.replace('*', '')
else:
query['label'] = label
type = self.request.params.get('type', None)
if type in ['concept', 'collection']:
query['type'] = type
# determine targets
providers = {}
ids = self.request.params.get('providers.ids', None)
if ids:
ids = ids.split(',')
providers['ids'] = ids
subject = self.request.params.get('providers.subject', None)
if subject:
providers['subject'] = subject
if not (ids or subject):
concepts = self.skos_registry.find(query, language=language)
else:
concepts = self.skos_registry.find(query, providers=providers, language=language)
# Flatten it all
cs = []
for c in concepts:
cs += c['concepts']
concepts = cs
if postprocess:
concepts = self._postprocess_wildcards(concepts, label)
concepts = self._sort_concepts(concepts)
return self._page_results(concepts)
@view_config(route_name='skosprovider.conceptscheme.cs', request_method='GET')
def get_conceptscheme_concepts(self):
scheme_id = self.request.matchdict['scheme_id']
provider = self.skos_registry.get_provider(scheme_id)
if not provider:
return HTTPNotFound()
query = {}
mode = self.request.params.get('mode', 'default')
label = self.request.params.get('label', None)
postprocess = False
if mode == 'dijitFilteringSelect' and label == '':
concepts = []
else:
if label not in [None, '*', '']:
if mode == 'dijitFilteringSelect' and '*' in label:
postprocess = True
query['label'] = label.replace('*', '')
else:
query['label'] = label
type = self.request.params.get('type', None)
if type in ['concept', 'collection']:
query['type'] = type
coll = self.request.params.get('collection', None)
if coll is not None:
query['collection'] = {'id': coll, 'depth': 'all'}
language = self.request.params.get('language', self.request.locale_name)
concepts = provider.find(query, language=language)
if postprocess:
concepts = self._postprocess_wildcards(concepts, label)
concepts = self._sort_concepts(concepts)
return self._page_results(concepts)
def _postprocess_wildcards(self, concepts, label):
# We need to refine results further
if label.startswith('*') and label.endswith('*'):
concepts = [c for c in concepts if label[1:-1] in c['label']]
elif label.endswith('*'):
concepts = [c for c in concepts if c['label'].startswith(label[0:-1])]
elif label.startswith('*'):
concepts = [c for c in concepts if c['label'].endswith(label[1:])]
return concepts
def _sort_concepts(self, concepts):
sort = self.request.params.get('sort', None)
#Result sorting
if sort:
sort_desc = (sort[0:1] == '-')
sort = sort[1:] if sort[0:1] in ['-', '+'] else sort
sort = sort.strip() # dojo store does not encode '+'
if (len(concepts) > 0) and (sort in concepts[0]):
concepts.sort(key=lambda concept: concept[sort], reverse=sort_desc)
return concepts
def _page_results(self, concepts):
# Result paging
paging_data = False
if 'Range' in self.request.headers:
paging_data = parse_range_header(self.request.headers['Range'])
count = len(concepts)
if not paging_data:
paging_data = {
'start': 0,
'finish': count - 1 if count > 0 else 0,
'number': count
}
cslice = concepts[paging_data['start']:paging_data['finish']+1]
self.request.response.headers[ascii_native_('Content-Range')] = \
ascii_native_('items %d-%d/%d' % (
paging_data['start'], paging_data['finish'], count
))
return cslice
@view_config(route_name='skosprovider.c', request_method='GET')
def get_concept(self):
scheme_id = self.request.matchdict['scheme_id']
concept_id = self.request.matchdict['c_id']
provider = self.skos_registry.get_provider(scheme_id)
concept = provider.get_by_id(concept_id)
if not concept:
return HTTPNotFound()
return concept
@view_config(route_name='skosprovider.c.display_children', request_method='GET')
def get_concept_display_children(self):
scheme_id = self.request.matchdict['scheme_id']
concept_id = self.request.matchdict['c_id']
provider = self.skos_registry.get_provider(scheme_id)
language = self.request.params.get('language', self.request.locale_name)
children = provider.get_children_display(concept_id, language=language)
if children == False:
return HTTPNotFound()
return children
@view_config(route_name='skosprovider.c.expand', request_method='GET')
def get_expand(self):
scheme_id = self.request.matchdict['scheme_id']
concept_id = self.request.matchdict['c_id']
provider = self.skos_registry.get_provider(scheme_id)
expanded = provider.expand(concept_id)
if expanded == False:
return HTTPNotFound()
return expanded