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views.py
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views.py
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from django.http import HttpResponse
from django.shortcuts import get_object_or_404
from elasticsearch_dsl import Q
from pydash import get
from rest_framework import response, generics, status
from rest_framework.generics import ListAPIView, RetrieveUpdateDestroyAPIView
from rest_framework.permissions import AllowAny
from rest_framework.response import Response
from core.common.constants import SEARCH_PARAM, ES_RESULTS_MAX_LIMIT, LIST_DEFAULT_LIMIT, CSV_DEFAULT_LIMIT, \
LIMIT_PARAM, NOT_FOUND, MUST_SPECIFY_EXTRA_PARAM_IN_BODY, INCLUDE_RETIRED_PARAM, VERBOSE_PARAM
from core.common.mixins import PathWalkerMixin
from core.common.serializers import RootSerializer
from core.common.utils import compact_dict_by_values, to_snake_case, to_camel_case
from core.concepts.permissions import CanViewParentDictionary, CanEditParentDictionary
from core.concepts.search import ConceptSearch
from core.mappings.search import MappingSearch
from core.orgs.constants import ORG_OBJECT_TYPE
from core.users.constants import USER_OBJECT_TYPE
class BaseAPIView(generics.GenericAPIView, PathWalkerMixin):
"""
An extension of generics.GenericAPIView that:
1. Adds a hook for a post-initialize step
2. De-couples the lookup field name (in the URL) from the "filter by" field name (in the queryset)
3. Performs a soft delete on destroy()
"""
pk_field = 'mnemonic'
user_is_self = False
is_searchable = False
limit = LIST_DEFAULT_LIMIT
default_filters = dict(is_active=True)
sort_asc_param = 'sortAsc'
sort_desc_param = 'sortDesc'
default_qs_sort_attr = '-updated_at'
exact_match = 'exact_match'
facet_class = None
def is_verbose(self):
return self.request.query_params.get(VERBOSE_PARAM, False) in ['true', True]
def initial(self, request, *args, **kwargs):
super().initial(request, *args, **kwargs)
self.initialize(request, request.path_info, **kwargs)
def initialize(self, request, path_info_segment, **kwargs): # pylint: disable=unused-argument
self.user_is_self = kwargs.pop('user_is_self', False)
self.limit = request.query_params.dict().get(LIMIT_PARAM, LIST_DEFAULT_LIMIT)
def get_object(self, queryset=None): # pylint: disable=arguments-differ
# Determine the base queryset to use.
if queryset is None:
queryset = self.filter_queryset(self.get_queryset())
else:
pass # Deprecation warning
# Perform the lookup filtering.
lookup = self.kwargs.get(self.lookup_field, None)
filter_kwargs = {self.pk_field: lookup}
obj = get_object_or_404(queryset, **filter_kwargs)
# May raise a permission denied
self.check_object_permissions(self.request, obj)
return obj
def destroy(self, request, *args, **kwargs): # pylint: disable=unused-argument
obj = self.get_object()
obj.soft_delete()
return response.Response(status=status.HTTP_204_NO_CONTENT)
def get_host_url(self):
return self.request.META['wsgi.url_scheme'] + '://' + self.request.get_host()
def head(self, request, **kwargs): # pylint: disable=unused-argument
res = HttpResponse()
res['num_found'] = self.filter_queryset(self.get_queryset()).count()
return res
def filter_queryset(self, queryset):
if self.is_searchable and self.should_perform_es_search():
return self.get_search_results_qs().filter(id__in=queryset.values_list('id'))
return super().filter_queryset(queryset).order_by(self.default_qs_sort_attr)
def get_sort_and_desc(self):
query_params = self.request.query_params.dict()
sort_field = query_params.get(self.sort_desc_param)
if sort_field is not None:
return sort_field, True
sort_field = query_params.get(self.sort_asc_param)
if sort_field is not None:
return sort_field, False
return None, None
def is_valid_sort(self, field):
if not self.es_fields or not field:
return False
if field in self.es_fields:
attrs = self.es_fields[field]
return attrs.get('sortable', False)
return False
def is_exact_match_on(self):
return self.request.query_params.dict().get(self.exact_match, None) == 'on'
def get_default_sort(self):
for field in self.es_fields:
attrs = self.es_fields[field]
if 'sortable' in attrs and 'default' in attrs:
prefix = '-' if attrs['default'] == 'desc' else ''
return prefix + field
return None
def get_searchable_fields(self):
return [field for field, config in get(self, 'es_fields', dict()).items() if config.get('filterable', False)]
def get_exact_search_fields(self):
return [field for field, config in get(self, 'es_fields', dict()).items() if config.get('exact', False)]
def get_search_string(self):
return self.request.query_params.dict().get(SEARCH_PARAM, '')
def get_wildcard_search_string(self):
return "*{}*".format(self.get_search_string())
def get_sort_attr(self):
sort_field, desc = self.get_sort_and_desc()
if self.is_valid_sort(sort_field):
if desc:
sort_field = '-' + sort_field
return sort_field
return dict(_score=dict(order="desc"))
def get_exact_search_criterion(self):
search_str = self.get_search_string()
def get_query(attr):
return Q('match', **{attr: search_str})
exact_search_fields = self.get_exact_search_fields()
criterion = get_query(exact_search_fields.pop())
for field in exact_search_fields:
criterion |= get_query(field)
return criterion
def get_faceted_criterion(self):
filters = self.get_faceted_filters()
def get_query(attr, val):
vals = val.split(',')
criteria = Q('match', **{attr: vals.pop()})
for _val in vals:
criteria |= Q('match', **{attr: _val})
return criteria
if filters:
first_filter = filters.popitem()
criterion = get_query(first_filter[0], first_filter[1])
for field, value in filters.items():
criterion &= get_query(field, value)
return criterion
def get_faceted_filters(self, split=False):
faceted_filters = dict()
faceted_fields = self.get_faceted_fields()
query_params = {to_snake_case(k): v for k, v in self.request.query_params.dict().items()}
for field in faceted_fields:
if field in query_params:
query_value = query_params[field]
faceted_filters[field] = query_value.split(',') if split else query_value
return faceted_filters
def get_faceted_fields(self):
return [field for field, config in get(self, 'es_fields', dict()).items() if config.get('facet', False)]
def get_facet_filters_from_kwargs(self):
kwargs = self.kwargs
filters = dict()
if 'user' in kwargs:
filters['ownerType'] = USER_OBJECT_TYPE
filters['owner'] = kwargs['user']
if 'org' in kwargs:
filters['ownerType'] = ORG_OBJECT_TYPE
filters['owner'] = kwargs['org']
if 'source' in kwargs:
filters['source'] = kwargs['source']
if 'collection' in kwargs:
filters['collection'] = kwargs['collection']
return filters
def get_facets(self):
facets = dict()
if self.should_include_facets() and self.facet_class:
faceted_filters = {to_camel_case(k): v for k, v in self.get_faceted_filters(True).items()}
filters = {
**self.default_filters, **self.get_facet_filters_from_kwargs(), **faceted_filters, 'retired': False
}
if self.should_include_retired() or self.facet_class not in [ConceptSearch, MappingSearch]:
filters.pop('retired')
searcher = self.facet_class( # pylint: disable=not-callable
self.get_search_string(), filters=filters, exact_match=self.is_exact_match_on()
)
facets = searcher.execute().facets.to_dict()
return facets
def should_include_retired(self):
return self.request.query_params.get(INCLUDE_RETIRED_PARAM, False) in ['true', True]
def get_extras_searchable_fields_from_query_params(self):
query_params = self.request.query_params.dict()
return {
k: v for k, v in query_params.items() if k.startswith('extras.') and not k.startswith('extras.exists')
}
def get_extras_fields_exists_from_query_params(self):
extras_exists_fields = self.request.query_params.dict().get('extras.exists', None)
if extras_exists_fields:
return extras_exists_fields.split(',')
return []
def get_search_results(self):
results = None
if self.should_perform_es_search():
results = self.document_model.search()
for field, value in self.default_filters.items():
results = results.filter("match", **{field: value})
faceted_criterion = self.get_faceted_criterion()
extras_fields = self.get_extras_searchable_fields_from_query_params()
extras_fields_exists = self.get_extras_fields_exists_from_query_params()
if faceted_criterion:
results = results.query(faceted_criterion)
if self.is_exact_match_on():
results = results.query(self.get_exact_search_criterion())
else:
results = results.filter(
"query_string", query=self.get_wildcard_search_string(), fields=self.get_searchable_fields()
)
if extras_fields:
for field, value in extras_fields.items():
results = results.filter(
"query_string", query=value, fields=[field]
)
if extras_fields_exists:
for field in extras_fields_exists:
results = results.query(
"exists", field="extras.{}".format(field)
)
results = results[0:ES_RESULTS_MAX_LIMIT]
sort_field = self.get_sort_attr()
if sort_field:
results = results.sort(sort_field)
return results
def get_search_results_qs(self):
queryset = None
search_results = self.get_search_results()
if search_results:
queryset = search_results.to_queryset()
return queryset
def should_perform_es_search(self):
return bool(
SEARCH_PARAM in self.request.query_params and
self.document_model and
self.get_searchable_fields()
) or bool(
self.get_extras_searchable_fields_from_query_params()
) or bool(self.get_extras_fields_exists_from_query_params())
class SourceChildCommonBaseView(BaseAPIView):
lookup_field = None
model = None
queryset = None
params = None
document_model = None
es_fields = dict()
pk_field = 'mnemonic'
permission_classes = (CanViewParentDictionary, )
is_searchable = True
default_filters = dict(is_active=True, is_latest_version=True)
def initial(self, request, *args, **kwargs):
super().initial(request, *args, **kwargs)
self.__set_params()
def get_filter_params(self):
if self.params:
return self.params
self.__set_params()
return self.params
def __get_params(self):
kwargs = self.kwargs.copy()
if self.user_is_self and self.request.user.is_authenticated:
kwargs['user'] = self.request.user.username
query_params = self.request.query_params.dict().copy()
kwargs.update(query_params)
return compact_dict_by_values(kwargs)
def __set_params(self):
self.params = self.__get_params()
if self.params:
self.limit = CSV_DEFAULT_LIMIT if self.params.get('csv') else int(self.params.get(
LIMIT_PARAM, LIST_DEFAULT_LIMIT
))
class SourceChildExtrasBaseView:
default_qs_sort_attr = '-created_at'
def get_object(self):
queryset = self.get_queryset()
if 'concept_version' in self.kwargs or 'mapping_version' in self.kwargs:
return queryset.first()
return queryset.filter(is_latest_version=True).first()
def get_permissions(self):
if self.request.method in ['GET', 'HEAD']:
return [CanViewParentDictionary()]
return [CanEditParentDictionary()]
class SourceChildExtrasView(SourceChildExtrasBaseView, ListAPIView):
def list(self, request, *args, **kwargs):
return Response(get(self.get_object(), 'extras', {}))
class SourceChildExtraRetrieveUpdateDestroyView(SourceChildExtrasBaseView, RetrieveUpdateDestroyAPIView):
def retrieve(self, request, *args, **kwargs):
key = kwargs.get('extra')
instance = self.get_object()
extras = get(instance, 'extras', {})
if key in extras:
return Response({key: extras[key]})
return Response(dict(detail=NOT_FOUND), status=status.HTTP_404_NOT_FOUND)
def update(self, request, **kwargs):
key = kwargs.get('extra')
value = request.data.get(key)
if not value:
return Response([MUST_SPECIFY_EXTRA_PARAM_IN_BODY.format(key)], status=status.HTTP_400_BAD_REQUEST)
new_version = self.get_object().clone()
new_version.extras[key] = value
new_version.comment = 'Updated extras: %s=%s.' % (key, value)
errors = self.model.persist_clone(new_version, request.user)
if errors:
return Response(errors, status=status.HTTP_400_BAD_REQUEST)
return Response({key: value})
def delete(self, request, *args, **kwargs):
key = kwargs.get('extra')
new_version = self.get_object().clone()
if key in new_version.extras:
del new_version.extras[key]
new_version.comment = 'Deleted extra %s.' % key
errors = self.model.persist_clone(new_version, request.user)
if errors:
return Response(errors, status=status.HTTP_400_BAD_REQUEST)
return Response(status=status.HTTP_204_NO_CONTENT)
return Response(dict(detail=NOT_FOUND), status=status.HTTP_404_NOT_FOUND)
class RootView(BaseAPIView): # pragma: no cover
permission_classes = (AllowAny,)
serializer_class = RootSerializer
def get(self, _):
from core.urls import urlpatterns
data = dict(version='2.0.0.beta.1', routes={})
for pattern in urlpatterns:
name = getattr(pattern, 'name', None) or getattr(pattern, 'app_name', None)
if name in ['admin']:
continue
route = str(pattern.pattern)
if route and name is None:
name = route.split('/')[0] + '_urls'
if name == 'user_urls':
name = 'current_user_urls'
data['routes'][name] = self.get_host_url() + '/' + str(pattern.pattern)
data['routes'].pop('root')
return Response(data)