104 lines
4.1 KiB
Python
104 lines
4.1 KiB
Python
import json
|
|
import typing
|
|
|
|
from django.core.exceptions import ValidationError
|
|
from django.core.validators import RegexValidator
|
|
from django.db import models
|
|
from django.utils.translation import ugettext_lazy as _
|
|
from shapely import validation
|
|
from shapely.geometry import LineString, MultiPolygon, Point, Polygon, mapping, shape
|
|
from shapely.geometry.base import BaseGeometry
|
|
|
|
from c3nav.mapdata.utils.geometry import clean_geometry
|
|
from c3nav.mapdata.utils.json import format_geojson
|
|
|
|
validate_bssid_lines = RegexValidator(regex=r'^([0-9a-f]{2}(:[0-9a-f]{2}){5}(\r?\n[0-9a-f]{2}(:[0-9a-f]{2}){5})*)?$',
|
|
message=_('please enter a newline seperated lowercase list of BSSIDs'))
|
|
|
|
|
|
def validate_geometry(geometry: BaseGeometry):
|
|
if not isinstance(geometry, BaseGeometry):
|
|
raise ValidationError('GeometryField expected a Shapely BaseGeometry child-class.')
|
|
|
|
if not geometry.is_valid:
|
|
raise ValidationError('Invalid geometry: %s' % validation.explain_validity(geometry))
|
|
|
|
|
|
class GeometryField(models.TextField):
|
|
default_validators = [validate_geometry]
|
|
|
|
def __init__(self, geomtype=None, default=None):
|
|
if geomtype == 'polyline':
|
|
geomtype = 'linestring'
|
|
if geomtype not in (None, 'polygon', 'multipolygon', 'linestring', 'point'):
|
|
raise ValueError('GeometryField.geomtype has to be '
|
|
'None, "polygon", "multipolygon", "linestring" or "point"')
|
|
self.geomtype = geomtype
|
|
super().__init__(default=default)
|
|
|
|
def deconstruct(self):
|
|
name, path, args, kwargs = super().deconstruct()
|
|
if self.geomtype is not None:
|
|
kwargs['geomtype'] = self.geomtype
|
|
return name, path, args, kwargs
|
|
|
|
def from_db_value(self, value, expression, connection, context):
|
|
if value is None:
|
|
return value
|
|
return shape(json.loads(value))
|
|
|
|
def to_python(self, value):
|
|
if value is None or value == '':
|
|
return None
|
|
try:
|
|
geometry = shape(json.loads(value))
|
|
except:
|
|
raise ValidationError(_('Invalid GeoJSON.'))
|
|
self._validate_geomtype(geometry)
|
|
try:
|
|
geometry = clean_geometry(geometry)
|
|
except:
|
|
raise ValidationError(_('Could not clean geometry.'))
|
|
self._validate_geomtype(geometry)
|
|
return geometry
|
|
|
|
def _validate_geomtype(self, value, exception: typing.Type[Exception]=ValidationError):
|
|
if self.geomtype == 'polygon' and not isinstance(value, Polygon):
|
|
raise exception('Expected Polygon instance, got %s instead.' % repr(value))
|
|
if self.geomtype == 'multipolygon' and not isinstance(value, (Polygon, MultiPolygon)):
|
|
raise exception('Expected Polygon or MultiPolygon instance, got %s instead.' % repr(value))
|
|
elif self.geomtype == 'linestring' and not isinstance(value, LineString):
|
|
raise exception('Expected LineString instance, got %s instead.' % repr(value))
|
|
elif self.geomtype == 'point' and not isinstance(value, Point):
|
|
raise exception('Expected Point instance, got %s instead.' % repr(value))
|
|
|
|
def get_prep_value(self, value):
|
|
if value is None:
|
|
return None
|
|
self._validate_geomtype(value, exception=TypeError)
|
|
json_value = format_geojson(mapping(value))
|
|
rounded_value = shape(json_value)
|
|
if not rounded_value.is_valid:
|
|
json_value = format_geojson(mapping(rounded_value.buffer(0)))
|
|
return json.dumps(json_value)
|
|
|
|
def value_to_string(self, obj):
|
|
value = self.value_from_object(obj)
|
|
return self.get_prep_value(value)
|
|
|
|
|
|
class JSONField(models.TextField):
|
|
def from_db_value(self, value, expression, connection, context):
|
|
if value is None:
|
|
return value
|
|
return json.loads(value)
|
|
|
|
def to_python(self, value):
|
|
return json.loads(value)
|
|
|
|
def get_prep_value(self, value):
|
|
return json.dumps(value)
|
|
|
|
def value_to_string(self, obj):
|
|
value = self.value_from_object(obj)
|
|
return self.get_prep_value(value)
|