264 lines
12 KiB
Python
264 lines
12 KiB
Python
#
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# This file is part of Mapnik (c++ mapping toolkit)
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#
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# Copyright (C) 2006 Jean-Francois Doyon
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#
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# Mapnik is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# $Id$
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"""WMS 1.3.0 compliant GetCapabilities, GetMap, GetFeatureInfo, and Exceptions interface."""
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from common import ParameterDefinition, Response, Version, ListFactory, \
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ColorFactory, CRSFactory, CRS, WMSBaseServiceHandler, \
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BaseExceptionHandler, Projection, Box2d
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from exceptions import OGCException, ServerConfigurationError
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from mapnik2 import Coord
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try:
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from lxml import etree as ElementTree
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except ImportError:
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import xml.etree.ElementTree as ElementTree
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except ImportError:
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import elementtree.ElementTree as ElementTree
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class ServiceHandler(WMSBaseServiceHandler):
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SERVICE_PARAMS = {
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'GetCapabilities': {
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'format': ParameterDefinition(False, str, 'text/xml', ('text/xml',), True),
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'updatesequence': ParameterDefinition(False, str)
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},
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'GetMap': {
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'layers': ParameterDefinition(True, ListFactory(str)),
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'styles': ParameterDefinition(True, ListFactory(str)),
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'crs': ParameterDefinition(True, CRSFactory(['EPSG'])),
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'bbox': ParameterDefinition(True, ListFactory(float)),
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'width': ParameterDefinition(True, int),
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'height': ParameterDefinition(True, int),
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'format': ParameterDefinition(True, str, allowedvalues=('image/png', 'image/jpeg')),
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'transparent': ParameterDefinition(False, str, 'FALSE', ('TRUE', 'FALSE')),
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'bgcolor': ParameterDefinition(False, ColorFactory, ColorFactory('0xFFFFFF')),
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'exceptions': ParameterDefinition(False, str, 'XML', ('XML', 'INIMAGE', 'BLANK','HTML')),
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},
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'GetFeatureInfo': {
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'layers': ParameterDefinition(True, ListFactory(str)),
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'styles': ParameterDefinition(False, ListFactory(str)),
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'crs': ParameterDefinition(True, CRSFactory(['EPSG'])),
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'bbox': ParameterDefinition(True, ListFactory(float)),
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'width': ParameterDefinition(True, int),
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'height': ParameterDefinition(True, int),
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'format': ParameterDefinition(False, str, allowedvalues=('image/png', 'image/jpeg')),
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'transparent': ParameterDefinition(False, str, 'FALSE', ('TRUE', 'FALSE')),
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'bgcolor': ParameterDefinition(False, ColorFactory, ColorFactory('0xFFFFFF')),
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'exceptions': ParameterDefinition(False, str, 'XML', ('XML', 'INIMAGE', 'BLANK','HTML')),
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'query_layers': ParameterDefinition(True, ListFactory(str)),
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'info_format': ParameterDefinition(True, str, allowedvalues=('text/plain', 'text/xml')),
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'feature_count': ParameterDefinition(False, int, 1),
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'i': ParameterDefinition(True, float),
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'j': ParameterDefinition(True, float)
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}
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}
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CONF_SERVICE = [
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['title', 'Title', str],
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['abstract', 'Abstract', str],
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['onlineresource', 'OnlineResource', str],
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['fees', 'Fees', str],
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['accessconstraints', 'AccessConstraints', str],
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['layerlimit', 'LayerLimit', int],
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['maxwidth', 'MaxWidth', int],
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['maxheight', 'MaxHeight', int],
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['keywordlist', 'KeywordList', str]
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]
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capabilitiesxmltemplate = """<?xml version="1.0" encoding="UTF-8"?>
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<WMS_Capabilities version="1.3.0" xmlns="http://www.opengis.net/wms"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.opengis.net/wms http://schemas.opengis.net/wms/1.3.0/capabilities_1_3_0.xsd">
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<Service>
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<Name>WMS</Name>
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</Service>
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<Capability>
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<Request>
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<GetCapabilities>
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<Format>text/xml</Format>
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<DCPType>
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<HTTP>
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<Get>
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<OnlineResource xlink:type="simple"/>
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</Get>
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</HTTP>
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</DCPType>
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</GetCapabilities>
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<GetMap>
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<Format>image/png</Format>
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<Format>image/jpeg</Format>
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<DCPType>
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<HTTP>
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<Get>
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<OnlineResource xlink:type="simple"/>
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</Get>
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</HTTP>
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</DCPType>
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</GetMap>
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<GetFeatureInfo>
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<Format>text/plain</Format>
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<DCPType>
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<HTTP>
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<Get>
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<OnlineResource xlink:type="simple"/>
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</Get>
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</HTTP>
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</DCPType>
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</GetFeatureInfo>
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</Request>
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<Exception>
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<Format>XML</Format>
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<Format>INIMAGE</Format>
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<Format>BLANK</Format>
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</Exception>
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<Layer>
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<Title>A Mapnik WMS Server</Title>
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<Abstract>A Mapnik WMS Server</Abstract>
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</Layer>
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</Capability>
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</WMS_Capabilities>
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"""
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def __init__(self, conf, mapfactory, opsonlineresource):
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self.conf = conf
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self.mapfactory = mapfactory
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self.opsonlineresource = opsonlineresource
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if self.conf.has_option('service', 'allowedepsgcodes'):
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self.allowedepsgcodes = map(lambda code: 'epsg:%s' % code, self.conf.get('service', 'allowedepsgcodes').split(','))
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else:
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raise ServerConfigurationError('Allowed EPSG codes not properly configured.')
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self.capabilities = None
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def GetCapabilities(self, params):
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if not self.capabilities:
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capetree = ElementTree.fromstring(self.capabilitiesxmltemplate)
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elements = capetree.findall('{http://www.opengis.net/wms}Capability//{http://www.opengis.net/wms}OnlineResource')
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for element in elements:
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element.set('{http://www.w3.org/1999/xlink}href', self.opsonlineresource)
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self.processServiceCapabilities(capetree)
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rootlayerelem = capetree.find('{http://www.opengis.net/wms}Capability/{http://www.opengis.net/wms}Layer')
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for epsgcode in self.allowedepsgcodes:
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rootlayercrs = ElementTree.Element('CRS')
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rootlayercrs.text = epsgcode.upper()
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rootlayerelem.append(rootlayercrs)
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for layer in self.mapfactory.ordered_layers:
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layerproj = Projection(layer.srs)
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layername = ElementTree.Element('Name')
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layername.text = layer.name
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env = layer.envelope()
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layerexgbb = ElementTree.Element('EX_GeographicBoundingBox')
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ll = layerproj.inverse(Coord(env.minx, env.miny))
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ur = layerproj.inverse(Coord(env.maxx, env.maxy))
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exgbb_wbl = ElementTree.Element('westBoundLongitude')
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exgbb_wbl.text = str(ll.x)
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layerexgbb.append(exgbb_wbl)
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exgbb_ebl = ElementTree.Element('eastBoundLongitude')
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exgbb_ebl.text = str(ur.x)
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layerexgbb.append(exgbb_ebl)
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exgbb_sbl = ElementTree.Element('southBoundLatitude')
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exgbb_sbl.text = str(ll.y)
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layerexgbb.append(exgbb_sbl)
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exgbb_nbl = ElementTree.Element('northBoundLatitude')
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exgbb_nbl.text = str(ur.y)
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layerexgbb.append(exgbb_nbl)
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layerbbox = ElementTree.Element('BoundingBox')
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layerbbox.set('CRS', layerproj.epsgstring())
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layerbbox.set('minx', str(env.minx))
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layerbbox.set('miny', str(env.miny))
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layerbbox.set('maxx', str(env.maxx))
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layerbbox.set('maxy', str(env.maxy))
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layere = ElementTree.Element('Layer')
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layere.append(layername)
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if layer.title:
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layertitle = ElementTree.Element('Title')
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layertitle.text = layer.title
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layere.append(layertitle)
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if layer.abstract:
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layerabstract = ElementTree.Element('Abstract')
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layerabstract.text = layer.abstract
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layere.append(layerabstract)
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if layer.queryable:
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layere.set('queryable', '1')
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layere.append(layerexgbb)
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layere.append(layerbbox)
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if len(layer.wmsextrastyles) > 0:
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for extrastyle in [layer.wmsdefaultstyle] + list(layer.wmsextrastyles):
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style = ElementTree.Element('Style')
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stylename = ElementTree.Element('Name')
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stylename.text = extrastyle
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styletitle = ElementTree.Element('Title')
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styletitle.text = extrastyle
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style.append(stylename)
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style.append(styletitle)
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layere.append(style)
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rootlayerelem.append(layere)
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self.capabilities = '<?xml version="1.0" encoding="UTF-8"?>' + ElementTree.tostring(capetree)
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response = Response('text/xml', self.capabilities)
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return response
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def GetMap(self, params):
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if params['width'] > int(self.conf.get('service', 'maxwidth')) or params['height'] > int(self.conf.get('service', 'maxheight')):
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raise OGCException('Requested map size exceeds limits set by this server.')
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return WMSBaseServiceHandler.GetMap(self, params)
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def _buildMap(self, params):
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""" Override _buildMap method to handle reverse axis ordering in WMS 1.3.0.
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More info: http://mapserver.org/development/rfc/ms-rfc-30.html
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'when using epsg code >=4000 and <5000 will be assumed to have a reversed axes.'
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"""
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# Call superclass method
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m = WMSBaseServiceHandler._buildMap(self, params)
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# for range of epsg codes reverse axis
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if params['crs'].code >= 4000 and params['crs'].code < 5000:
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m.zoom_to_box(Box2d(params['bbox'][1], params['bbox'][0], params['bbox'][3], params['bbox'][2]))
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return m
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class ExceptionHandler(BaseExceptionHandler):
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xmlmimetype = "text/xml"
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xmltemplate = ElementTree.fromstring("""<?xml version='1.0' encoding="UTF-8"?>
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<ServiceExceptionReport version="1.3.0"
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xmlns="http://www.opengis.net/ogc"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.opengis.net/ogc http://schemas.opengis.net/wms/1.3.0/exceptions_1_3_0.xsd">
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<ServiceException/>
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</ServiceExceptionReport>
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""")
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xpath = '{http://www.opengis.net/ogc}ServiceException'
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handlers = {'XML': BaseExceptionHandler.xmlhandler,
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'INIMAGE': BaseExceptionHandler.inimagehandler,
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'BLANK': BaseExceptionHandler.blankhandler,
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'HTML': BaseExceptionHandler.htmlhandler}
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defaulthandler = 'XML'
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