/
ows.py
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/
ows.py
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import json
from django.http import HttpResponse
from django.shortcuts import get_object_or_404
from ga_ows.views import wms, wfs
from ga_resources import models, dispatch
from ga_resources.drivers import shapefile, render, CacheManager
from ga_resources.models import RenderedLayer
from ga_resources.utils import authorize
from matplotlib.finance import md5
from osgeo import osr, ogr
class WMSAdapter(wms.WMSAdapterBase):
def layerlist(self):
return [l.slug for l in models.RenderedLayer.objects.all()]
def get_2d_dataset(self, layers, srs, bbox, width, height, styles, bgcolor, transparent, time, elevation, v, filter,
**kwargs):
"""use the driver to render a tile"""
return render(kwargs['format'], width, height, bbox, srs, styles, layers, **kwargs)
def get_feature_info(self, wherex, wherey, layers, callback, format, feature_count, srs, filter, fuzziness=0,
**kwargs): # fuzziness of 30 meters by default
"""use the driver to get feature info"""
if srs.lower().startswith('epsg'):
s = osr.SpatialReference()
s.ImportFromEPSG(int(srs[5:]))
srs = s.ExportToProj4()
feature_info = {
layer: models.RenderedLayer.objects.get(slug=layer).data_resource.driver_instance.get_data_for_point(
wherex, wherey, srs, fuzziness=fuzziness, **kwargs
)
for layer in layers}
return feature_info
def nativesrs(self, layer):
"""Use the resource record to get native SRS"""
resource = models.RenderedLayer.objects.get(slug=layer).data_resource
return resource.native_srs
def nativebbox(self, layer=None):
"""Use the resource record to get the native bounding box"""
if layer:
resource = models.RenderedLayer.objects.get(slug=layer).data_resource
return resource.native_bounding_box.extent
else:
return (-180, -90, 180, 90)
def styles(self):
"""Use the resource record to get the available styles"""
return list(models.Style.objects.all())
def get_layer_descriptions(self):
"""
This should return a list of dictionaries. Each dictionary should follow this format::
{ ""name"" : layer_"name",
"title" : human_readable_title,
"srs" : spatial_reference_id,
"queryable" : whether or not GetFeatureInfo is supported for this layer,
"minx" : native_west_boundary,
"miny" : native_south_boundary,
"maxx" : native_east_boundary,
"maxy" : native_north_boundary,
"ll_minx" : west_boundary_epsg4326,
"ll_miny" : south_boundary_epsg4326,
"ll_maxx" : east_boundary_epsg4326,
"ll_maxy" : north_boundary_epsg4326,
"styles" : [list_of_style_descriptions]
Each style description in list_of_style_descriptions should follow this format::
{ ""name"" : style_"name",
"title" : style_title,
"legend_width" : style_legend_width,
"legend_height" : style_legend_height,
"legend_url" : style_legend_url
}
"""
layers = models.RenderedLayer.objects.all()
ret = []
for layer in layers:
desc = {}
ret.append(desc)
desc["name"] = layer.slug
desc['title'] = layer.title
desc['srs'] = layer.data_resource.native_srs
desc['queryable'] = True
desc['minx'], desc['miny'], desc['maxx'], desc[
'maxy'] = layer.data_resource.native_bounding_box.extent # FIXME this is not native
desc['ll_minx'], desc['ll_miny'], desc['ll_maxx'], desc[
'll_maxy'] = layer.data_resource.bounding_box.extent
desc['styles'] = []
desc['styles'].append({
"name": layer.default_style.slug,
'title': layer.default_style.title,
'legend_width': layer.default_style.legend_width,
'legend_height': layer.default_style.legend_height,
'legend_url': layer.default_style.legend.url if layer.default_style.legend else ""
})
for style in layer.styles.all():
desc['styles'].append({
"name": style.slug,
'title': style.title,
'legend_width': style.legend_width,
'legend_height': style.legend_height,
'legend_url': style.legend.url if style.legend else ""
})
return ret
def get_service_boundaries(self):
"""Just go ahead and return the world coordinates"""
return {
"minx": -180.0,
"miny": -90.0,
"maxx": 180.0,
"maxy": 90.0
}
class WMS(wms.WMS):
adapter = WMSAdapter([])
class WFSAdapter(wfs.WFSAdapter):
def get_feature_descriptions(self, request, *types):
namespace = request.build_absolute_uri().split('?')[
0] + "/schema" # todo: include https://bitbucket.org/eegg/django-model-schemas/wiki/Home
for type_name in types:
res = get_object_or_404(models.DataResource, slug=type_name)
yield wfs.FeatureDescription(
ns=namespace,
ns_name='ga_resources',
name=res.slug,
abstract=res.description,
title=res.title,
keywords=res.keywords,
srs=res.native_srs,
bbox=res.bounding_box,
schema=namespace + '/' + res.slug
)
def list_stored_queries(self, request):
"""list all the queries associated with drivers"""
sq = super(WFSAdapter, self).list_stored_queries(request)
return sq
def get_features(self, request, parms):
if parms.cleaned_data['stored_query_id']:
squid = "SQ_" + parms.cleaned_data['stored_query_id']
slug = parms.cleaned_data['type_names'] if isinstance(parms.cleaned_data['type_names'], basestring) else \
parms.cleaned_data['type_names'][0]
try:
return models.DataResource.driver_instance.query_operation(squid)(request, **parms.cleaned_data)
except:
raise wfs.OperationNotSupported.at('GetFeatures', 'stored_query_id={squid}'.format(squid=squid))
else:
return self.AdHocQuery(request, **parms.cleaned_data)
def AdHocQuery(self, req,
type_names=None,
filter=None,
filter_language=None,
bbox=None,
sort_by=None,
count=None,
start_index=None,
srs_name=None,
srs_format=None,
max_features=None,
**kwargs
):
model = get_object_or_404(models.DataResource, slug=type_names[0])
driver = model.driver_instance
extra = {}
if filter:
extra['filter'] = json.loads(filter)
if bbox:
extra['bbox'] = bbox
if srs_name:
srs = osr.SpatialReference()
if srs_name.lower().startswith('epsg'):
srs.ImportFromEPSG(int(srs_name[5:]))
else:
srs.ImportFromProj4(srs_name)
extra['srs'] = srs
else:
srs = model.srs
if start_index:
extra['start'] = start_index
count = count or max_features
if count:
extra['count'] = count
if "boundary" in kwargs:
extra['boundary'] = kwargs['boundary']
extra['boundary_type'] = kwargs['boundary_type']
df = driver.as_dataframe(**extra)
if sort_by:
extra['sort_by'] = sort_by
if filter_language and filter_language != 'json':
raise wfs.OperationNotSupported('filter language must be JSON for now')
filename = md5()
filename.update("{name}.{bbox}.{srs_name}x{filter}".format(
name=type_names[0],
bbox=','.join(str(b) for b in bbox),
srs_name=srs_name,
filter=filter
))
filename = filename.hexdigest()
shapefile.ShapefileDriver.from_dataframe(df, filename, srs)
ds = ogr.Open(filename)
return ds
def supports_feature_versioning(self):
return False
class WFS(wfs.WFS):
adapter = WFSAdapter()
def tms(request, layer, z, x, y, **kwargs):
z = int(z)
x = int(x)
y = int(y)
table = None
if '#' in layer:
layer_slug, table = layer.split('#')
else:
layer_slug = layer
layer_instance = RenderedLayer.objects.get(slug=layer_slug)
# dispatch.api_accessed.send(RenderedLayer, instance=layer_instance, user=user)
style = request.GET.get('style', layer_instance.default_style.slug)
tms = CacheManager.get().get_tile_cache([layer], [style])
return HttpResponse(tms.fetch_tile(z, x, y), mimetype='image/png')
def seed_layer(request, layer):
mnz = int(request.GET['minz'])
mxz = int(request.GET['maxz']) # anything greater would cause a DOS attack. We should do it manually
mnx = int(request.GET['minx'])
mxx = int(request.GET['maxx'])
mny = int(request.GET['miny'])
mxy = int(request.GET['maxy'])
layer = RenderedLayer.objects.get(slug=layer)
style = request.GET.get('style', layer.default_style)
user = authorize(request, page=layer, edit=True)
dispatch.api_accessed.send(RenderedLayer, instance=layer, user=user)
CacheManager.get().get_tile_cache(layers=[layer], styles=[style]).seed_tiles(mnz, mxz, mnx, mny, mxx, mxy)
return HttpResponse()