def legend(request, layername, layertitle=False, style=None): """Get the legend from a layer. :param layername: The layer name in Geonode. :type layername: basestring :param layertitle: Add the layer title in the legend. Default to False. :type layertitle: bool :param style: Layer style to choose :type style: str :return: The HTTPResponse with a PNG. """ layer = get_object_or_404(Layer, name=layername) qgis_layer = get_object_or_404(QGISServerLayer, layer=layer) # get default style name if not style: # generate style cache if not qgis_layer.default_style: try: style_list(layer, internal=False) except BaseException: print 'Failed to fetch styles' # refresh values qgis_layer.refresh_from_db() if qgis_layer.default_style: style = qgis_layer.default_style.name legend_path = QGIS_SERVER_CONFIG['legend_path'] legend_filename = legend_path % (qgis_layer.qgis_layer_name, style) if not os.path.exists(legend_filename): if not os.path.exists(os.path.dirname(legend_filename)): os.makedirs(os.path.dirname(legend_filename)) url = legend_url(layer, layertitle, style=style, internal=True) result = cache_request.delay(url, legend_filename) # Attempt to run task synchronously if not result.get(): # If not succeded, provides error message. return HttpResponseServerError('Failed to fetch legend.') if image_format(legend_filename) != 'png': logger.error('%s is not valid PNG.' % legend_filename) os.remove(legend_filename) if not os.path.exists(legend_filename): return HttpResponse('The legend could not be found.', status=409) with open(legend_filename, 'rb') as f: return HttpResponse(f.read(), content_type='image/png')
def tile(request, layername, z, x, y, style=None): """Get the tile from a layer. :param layername: The layer name in Geonode. :type layername: basestring :param z: TMS coordinate, zoom parameter :type z: int, str :param x: TMS coordinate, longitude parameter :type x: int, str :param y: TMS coordinate, latitude parameter :type y: int, str :param style: Layer style to choose :type style: str :return: The HTTPResponse with a PNG. """ x = int(x) y = int(y) z = int(z) layer = get_object_or_404(Layer, name=layername) qgis_layer = get_object_or_404(QGISServerLayer, layer=layer) # get default style name if not style: # generate style cache if not qgis_layer.default_style: try: style_list(layer, internal=False) except BaseException: print 'Failed to fetch styles' # refresh values qgis_layer.refresh_from_db() if qgis_layer.default_style: style = qgis_layer.default_style.name tile_path = QGIS_SERVER_CONFIG['tile_path'] tile_filename = tile_path % (qgis_layer.qgis_layer_name, style, z, x, y) if not os.path.exists(tile_filename): if not os.path.exists(os.path.dirname(tile_filename)): os.makedirs(os.path.dirname(tile_filename)) # Use internal url url = tile_url(layer, z, x, y, style=style, internal=True) result = cache_request.delay(url, tile_filename) # Attempt to run task synchronously if not result.get(): # If not succeded, provides error message. return HttpResponseServerError('Failed to fetch tile.') if image_format(tile_filename) != 'png': logger.error('%s is not valid PNG.' % tile_filename) os.remove(tile_filename) if not os.path.exists(tile_filename): return HttpResponse('The tile could not be found.', status=409) with open(tile_filename, 'rb') as f: return HttpResponse(f.read(), content_type='image/png')