class CoverageController(BaseController):
"""Converts coverage area descriptions to GeoJSON documents
so they can be visualized.
"""
def geojson_response(self, document):
if isinstance(document, dict):
document = json.dumps(document)
headers = {"Content-Type": "application/geo+json"}
return Response(document, 200, headers=headers)
def lookup(self):
coverage = flask.request.args.get('coverage')
try:
coverage = json.loads(coverage)
except ValueError, e:
pass
places, unknown, ambiguous = AuthenticationDocument.parse_coverage(
self._db, coverage)
document = Place.to_geojson(self._db, *places)
# Extend the GeoJSON with extra information about parts of the
# coverage document we found ambiguous or couldn't associate
# with a Place.
if unknown:
document['unknown'] = unknown
if ambiguous:
document['ambiguous'] = ambiguous
return self.geojson_response(document)
def _geojson_for_service_area(self, service_type):
"""Serve a GeoJSON document describing some subset of the active
library's service areas.
"""
areas = [
x.place for x in flask.request.library.service_areas
if x.type == service_type
]
return self.geojson_response(Place.to_geojson(self._db, *areas))
