source: TI05-delivery/ows_framework/trunk/ows_server/ows_server/lib/wmc_util.py @ 3661

# Copyright (C) 2007 STFC & NERC (Science and Technology Facilities Council).
# This software may be distributed under the terms of the
# Q Public License, version 1.0 or later.
# http://ndg.nerc.ac.uk/public_docs/QPublic_license.txt
"""
Utils to aid use of wmc docs - including interfacing these with the con terra client
and getting associated legend data

@author: Calum Byrom
"""
from ows_server.lib.base import *
from ows_server.lib.ndgInterface import interface
from ndgUtils.DocumentRetrieve import genericHTTP
from ndgUtils.ETxmlView import loadET,et2text, nsdumb
from ows_server.models.WMC import WMC
from ows_common import exceptions
import urllib2, urllib

def getConTerraDoc(wmcURLs):
    """
    Construct an aggregated XML file and POST this data to the Con Terra mapClient to visualise
    @param wmcURLS: An array of URLs pointing to WMC docs to visualise
    """
    c.wmcDocs = []
    for wmcURL in wmcURLs:
        c.wmcDocs.append(WMC(wmcURL)) 

        # need to send the aggregated data as POST data - so change the request method
    request.method = "POST"

    # now add the required data, using the aggregate template   
    logger.info('Creating XML Config doc for use with Con Terra mapClient')
    request.POST.add('xmlConfig', "<?xml version='1.0' encoding='UTF-8'?><pos:IMCPostConfig SRS='EPSG:4326' xmlns:pos='http://www.conterra.de/mapclient/businesstier/configuration/postinit'><pos:Map ImageFormat='image/png'><pos:WMService url='http://ogc.bgs.ac.uk/cgi-bin/GBR_625k_BGS_Bedrock_and_Superficial_Geology/wms?'></pos:WMService><pos:InitialExtent MinX='-100' MinY='-50' MaxX='100' MaxY='50'></pos:InitialExtent></pos:Map><pos:OverviewMap ImageFormat='image/png'><pos:WMService url='http://www.geographynetwork.com/servlet/com.esri.wms.Esrimap'><pos:AddLayer visible='true'>Continents</pos:AddLayer></pos:WMService></pos:OverviewMap></pos:IMCPostConfig>")#render('conterra_aggregate', format='xml'))
    logger.info('Posting request to mapClient for visualisation')
    h.redirect_to('http://www.gis.bgs.ac.uk:8080/mapClient/postInit.do')#http://www.conterra.de/mapclient/businesstier/configuration/postinit') 
    
#    response.headers['Content-Type'] = 'text/xml'
#    response.headers['Content-Disposition'] = 'attachment;filename=wmcAggregate.xml'
#    return render('conterra_aggregate', format='xml')

    
def GetWebMapContext(self):
    """
    Lookup a WMC doc and return it in the response
    """
    # retrieve context data from the specifiled url
    endpoint = self.inputs['ENDPOINT']
    if not endpoint:
        raise exceptions.MissingParameterValue, "ENDPOINT parameter required"
    logger.info('Getting WebMapContext from endpoint: ' + endpoint)

    try:
        filehandle = urllib2.urlopen(endpoint)
    except IOError:
        raise exceptions.URLUnavailable, "Could not access WMC endpoint: %s" % endpoint
        
    response.headers['Content-Type'] = 'text/xml'
    response.write(filehandle.read())
    

def GetLegend(self):
    """
    Lookup a legend for a WMS map
    NB, all required parameters are already included in the endpoint by this stage
    """
    endpoint = self.inputs['ENDPOINT']
    if not endpoint:
        raise exceptions.MissingParameterValue, "ENDPOINT parameter required"
    logger.info('Getting Legend from endpoint: ' + endpoint)

    try:
        filehandle = urllib2.urlopen(endpoint)
    except IOError:
        raise exceptions.URLUnavailable, "Could not access WMS endpoint: %s" % endpoint
        
    response.headers['Content-Type'] = 'text/xml'
    response.write(filehandle.read())