def _buildMetadata(self, parse_remote_metadata=False):
"""set up capabilities metadata objects: """
self.updateSequence = self._capabilities.attrib.get("updateSequence")
# ServiceIdentification
val = self._capabilities.find(
nspath_eval("ows:ServiceIdentification", namespaces))
if val is not None:
self.identification = ServiceIdentification(
val, self.owscommon.namespace)
# ServiceProvider
val = self._capabilities.find(
nspath_eval("ows:ServiceProvider", namespaces))
if val is not None:
self.provider = ServiceProvider(val, self.owscommon.namespace)
# ServiceOperations metadata
self.operations = []
for elem in self._capabilities.findall(
nspath_eval("ows:OperationsMetadata/ows:Operation",
namespaces)):
self.operations.append(
OperationsMetadata(elem, self.owscommon.namespace))
self.constraints = {}
for elem in self._capabilities.findall(
nspath_eval("ows:OperationsMetadata/ows:Constraint",
namespaces)):
self.constraints[elem.attrib["name"]] = Constraint(
elem, self.owscommon.namespace)
self.parameters = {}
for elem in self._capabilities.findall(
nspath_eval("ows:OperationsMetadata/ows:Parameter",
namespaces)):
self.parameters[elem.attrib["name"]] = Parameter(
elem, self.owscommon.namespace)
# FilterCapabilities
val = self._capabilities.find(
nspath_eval("ogc:Filter_Capabilities", namespaces))
self.filters = FilterCapabilities(val)
# serviceContents metadata: our assumption is that services use a top-level
# layer as a metadata organizer, nothing more.
self.contents = {}
features = self._capabilities.findall(
nspath_eval("wfs:FeatureTypeList/wfs:FeatureType", namespaces))
if features is not None:
for feature in features:
cm = ContentMetadata(feature,
parse_remote_metadata,
headers=self.headers,
auth=self.auth)
self.contents[cm.id] = cm
# exceptions
self.exceptions = [
f.text
for f in self._capabilities.findall("Capability/Exception/Format")
]
def _buildMetadata(self, parse_remote_metadata=False):
'''set up capabilities metadata objects: '''
self.updateSequence = self._capabilities.attrib.get('updateSequence')
#serviceIdentification metadata
serviceidentelem = self._capabilities.find(
nspath('ServiceIdentification'))
self.identification = ServiceIdentification(serviceidentelem)
#need to add to keywords list from featuretypelist information:
featuretypelistelem = self._capabilities.find(
nspath('FeatureTypeList', ns=WFS_NAMESPACE))
featuretypeelems = featuretypelistelem.findall(
nspath('FeatureType', ns=WFS_NAMESPACE))
for f in featuretypeelems:
kwds = f.findall(nspath('Keywords/Keyword', ns=OWS_NAMESPACE))
if kwds is not None:
for kwd in kwds[:]:
if kwd.text not in self.identification.keywords:
self.identification.keywords.append(kwd.text)
#TODO: update serviceProvider metadata, miss it out for now
serviceproviderelem = self._capabilities.find(
nspath('ServiceProvider'))
self.provider = ServiceProvider(serviceproviderelem)
#serviceOperations metadata
self.operations = []
for elem in self._capabilities.find(nspath('OperationsMetadata'))[:]:
if elem.tag != nspath('ExtendedCapabilities'):
self.operations.append(OperationsMetadata(elem))
self.constraints = {}
for elem in self._capabilities.findall(
nspath('OperationsMetadata/Constraint', ns=WFS_NAMESPACE)):
self.constraints[elem.attrib['name']] = Constraint(
elem, self.owscommon.namespace)
self.parameters = {}
for elem in self._capabilities.findall(
nspath('OperationsMetadata/Parameter', ns=WFS_NAMESPACE)):
self.parameters[elem.attrib['name']] = Parameter(
elem, self.owscommon.namespace)
#serviceContents metadata: our assumption is that services use a top-level
#layer as a metadata organizer, nothing more.
self.contents = {}
featuretypelist = self._capabilities.find(
nspath('FeatureTypeList', ns=WFS_NAMESPACE))
features = self._capabilities.findall(
nspath('FeatureTypeList/FeatureType', ns=WFS_NAMESPACE))
for feature in features:
cm = ContentMetadata(feature, featuretypelist,
parse_remote_metadata)
self.contents[cm.id] = cm
#exceptions
self.exceptions = [f.text for f \
in self._capabilities.findall('Capability/Exception/Format')]
def __init__(self, url, xml, cookies, auth=None, timeout=30, headers=None):
super(WebCoverageService_2_0_0, self).__init__(auth=auth,
timeout=timeout,
headers=headers)
self.version = "2.0.0"
self.url = url
self.cookies = cookies
self.timeout = timeout
self.ows_common = OwsCommon(version="2.0.0")
# initialize from saved capability document or access the server
reader = WCSCapabilitiesReader(self.version,
self.cookies,
self.auth,
headers=self.headers)
if xml:
self._capabilities = reader.readString(xml)
else:
self._capabilities = reader.read(self.url, self.timeout)
# check for exceptions
se = self._capabilities.find("ServiceException")
if se is not None:
err_message = str(se.text).strip()
raise ServiceException(err_message, xml)
# serviceIdentification metadata
subelem = self._capabilities.find(ns("ServiceIdentification"))
self.identification = ServiceIdentification(
subelem, namespace=self.ows_common.namespace)
# serviceProvider metadata
serviceproviderelem = self._capabilities.find(ns("ServiceProvider"))
self.provider = ServiceProvider(serviceproviderelem,
namespace=self.ows_common.namespace)
# serviceOperations metadata
self.operations = []
for elem in self._capabilities.find(ns("OperationsMetadata"))[:]:
if elem.tag != ns("ExtendedCapabilities"):
self.operations.append(
OperationsMetadata(elem,
namespace=self.ows_common.namespace))
# serviceContents metadata
self.contents = {}
for elem in self._capabilities.findall(
nsWCS2("Contents/") + nsWCS2("CoverageSummary")):
cm = ContentMetadata(elem, self)
self.contents[cm.id] = cm
# exceptions
self.exceptions = [
f.text
for f in self._capabilities.findall("Capability/Exception/Format")
]
def __init__(self, url, xml, cookies, auth=None):
super(WebCoverageService_2_0_1, self).__init__(auth=auth)
self.version = '2.0.1'
self.url = url
self.cookies = cookies
self.ows_common = OwsCommon(version='2.0.1')
# initialize from saved capability document or access the server
reader = WCSCapabilitiesReader(self.version, self.cookies, self.auth)
if xml:
self._capabilities = reader.readString(xml)
else:
self._capabilities = reader.read(self.url)
# check for exceptions
se = self._capabilities.find('ServiceException')
if se is not None:
err_message = str(se.text).strip()
raise ServiceException(err_message, xml)
#serviceIdentification metadata
subelem = self._capabilities.find(ns('ServiceIdentification'))
self.identification = ServiceIdentification(
subelem, namespace=self.ows_common.namespace)
#serviceProvider metadata
serviceproviderelem = self._capabilities.find(ns('ServiceProvider'))
self.provider = ServiceProvider(serviceproviderelem,
namespace=self.ows_common.namespace)
#serviceOperations metadata
self.operations = []
for elem in self._capabilities.find(ns('OperationsMetadata'))[:]:
if elem.tag != ns('ExtendedCapabilities'):
self.operations.append(
OperationsMetadata(elem,
namespace=self.ows_common.namespace))
#serviceContents metadata
self.contents = {}
for elem in self._capabilities.findall(
nsWCS2('Contents/') + nsWCS2('CoverageSummary')):
cm = ContentMetadata(elem, self)
self.contents[cm.id] = cm
#exceptions
self.exceptions = [f.text for f \
in self._capabilities.findall('Capability/Exception/Format')]
def _build_metadata(self, parse_remote_metadata=False):
'''set up capabilities metadata objects: '''
#serviceIdentification metadata
serviceidentelem=self._capabilities.find(nsp_ows('ows:ServiceIdentification'))
self.identification=ServiceIdentification(serviceidentelem)
#need to add to keywords list from featuretypelist information:
featuretypelistelem=self._capabilities.find(nspath('FeatureTypeList', ns.get_namespace('wfs')))
featuretypeelems=featuretypelistelem.findall(nspath('FeatureType', ns.get_namespace('wfs')))
for f in featuretypeelems:
kwds=f.findall(nspath('Keywords/Keyword',ns=OWS_NAMESPACE))
if kwds is not None:
for kwd in kwds[:]:
if kwd.text not in self.identification.keywords:
self.identification.keywords.append(kwd.text)
#TODO: update serviceProvider metadata, miss it out for now
#print vars(self._capabilities)
#return
serviceproviderelem=self._capabilities.find(nsp_ows('ows:ServiceProvider'))
self.provider=ServiceProvider(serviceproviderelem)
#serviceOperations metadata
op = self._capabilities.find(nspath_eval('ows:OperationsMetadata', _ows_version))
self.operations = OperationsMetadata(op, _ows_version).operations
#serviceContents metadata: our assumption is that services use a top-level
#layer as a metadata organizer, nothing more.
self.contents={}
featuretypelist=self._capabilities.find(nspath('FeatureTypeList',ns.get_namespace('wfs')))
features = self._capabilities.findall(nspath('FeatureTypeList/FeatureType',ns.get_namespace('wfs')))
for feature in features:
cm=ContentMetadata(feature, featuretypelist, parse_remote_metadata)
self.contents[cm.id]=cm
#exceptions
self.exceptions = [f.text for f \
in self._capabilities.findall('Capability/Exception/Format')]
class WebFeatureService_2_0_0(object):
"""Abstraction for OGC Web Feature Service (WFS).
Implements IWebFeatureService.
"""
def __new__(self,url, version, xml, parse_remote_metadata=False):
""" overridden __new__ method
@type url: string
@param url: url of WFS capabilities document
@type xml: string
@param xml: elementtree object
@type parse_remote_metadata: boolean
@param parse_remote_metadata: whether to fully process MetadataURL elements
@return: initialized WebFeatureService_2_0_0 object
"""
obj=object.__new__(self)
obj.__init__(url, version, xml, parse_remote_metadata)
self.log = logging.getLogger()
consoleh = logging.StreamHandler()
self.log.addHandler(consoleh)
return obj
def __getitem__(self,name):
''' check contents dictionary to allow dict like access to service layers'''
if name in self.__getattribute__('contents').keys():
return self.__getattribute__('contents')[name]
else:
raise KeyError, "No content named %s" % name
def __init__(self, url, version, xml=None, parse_remote_metadata=False):
"""Initialize."""
log.debug('building WFS %s'%url)
self.url = url
self.version = version
self._capabilities = None
reader = WFSCapabilitiesReader(self.version)
if xml:
self._capabilities = reader.read_string(xml)
else:
self._capabilities = reader.read(self.url)
self._build_metadata(parse_remote_metadata)
def _build_metadata(self, parse_remote_metadata=False):
'''set up capabilities metadata objects: '''
#serviceIdentification metadata
serviceidentelem=self._capabilities.find(nsp_ows('ows:ServiceIdentification'))
self.identification=ServiceIdentification(serviceidentelem)
#need to add to keywords list from featuretypelist information:
featuretypelistelem=self._capabilities.find(nspath('FeatureTypeList', ns.get_namespace('wfs')))
featuretypeelems=featuretypelistelem.findall(nspath('FeatureType', ns.get_namespace('wfs')))
for f in featuretypeelems:
kwds=f.findall(nspath('Keywords/Keyword',ns=OWS_NAMESPACE))
if kwds is not None:
for kwd in kwds[:]:
if kwd.text not in self.identification.keywords:
self.identification.keywords.append(kwd.text)
#TODO: update serviceProvider metadata, miss it out for now
#print vars(self._capabilities)
#return
serviceproviderelem=self._capabilities.find(nsp_ows('ows:ServiceProvider'))
self.provider=ServiceProvider(serviceproviderelem)
#serviceOperations metadata
op = self._capabilities.find(nspath_eval('ows:OperationsMetadata', _ows_version))
self.operations = OperationsMetadata(op, _ows_version).operations
#serviceContents metadata: our assumption is that services use a top-level
#layer as a metadata organizer, nothing more.
self.contents={}
featuretypelist=self._capabilities.find(nspath('FeatureTypeList',ns.get_namespace('wfs')))
features = self._capabilities.findall(nspath('FeatureTypeList/FeatureType',ns.get_namespace('wfs')))
for feature in features:
cm=ContentMetadata(feature, featuretypelist, parse_remote_metadata)
self.contents[cm.id]=cm
#exceptions
self.exceptions = [f.text for f \
in self._capabilities.findall('Capability/Exception/Format')]
def getcapabilities(self):
"""Request and return capabilities document from the WFS as a
file-like object.
NOTE: this is effectively redundant now"""
reader = WFSCapabilitiesReader(self.version)
return urlopen(reader.capabilities_url(self.url))
def items(self):
'''supports dict-like items() access'''
items=[]
for item in self.contents:
items.append((item,self.contents[item]))
return items
def getfeature(self, typename=None, filter=None, bbox=None, featureid=None,
featureversion=None, propertyname=None, maxfeatures=None,storedQueryID=None, storedQueryParams={},
method='Get'):
"""Request and return feature data as a file-like object.
#TODO: NOTE: have changed property name from ['*'] to None - check the use of this in WFS 2.0
Parameters
----------
typename : list
List of typenames (string)
filter : string
XML-encoded OGC filter expression.
bbox : tuple
(left, bottom, right, top) in the feature type's coordinates == (minx, miny, maxx, maxy)
featureid : list
List of unique feature ids (string)
featureversion : string
Default is most recent feature version.
propertyname : list
List of feature property names. '*' matches all.
maxfeatures : int
Maximum number of features to be returned.
method : string
Qualified name of the HTTP DCP method to use.
There are 3 different modes of use
1) typename and bbox (simple spatial query)
2) typename and filter (==query) (more expressive)
3) featureid (direct access to known features)
"""
#log.debug(self.getOperationByName('GetFeature'))
base_url = self.getOperationByName('GetFeature').methods[method]['url']
if method.upper() == "GET":
base_url = base_url if base_url.endswith("?") else base_url+"?"
request = {'service': 'WFS', 'version': self.version, 'request': 'GetFeature'}
# check featureid
if featureid:
request['featureid'] = ','.join(featureid)
elif bbox:
# request['bbox'] = ','.join([str(x) for x in bbox])
request['query'] ='<Query xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" xmlns:csml="http://ndg.nerc.ac.uk/csml"><ogc:Filter><ogc:BBOX><gml:Envelope srsName="WGS84"><gml:lowerCorner>%s %s</gml:lowerCorner><gml:upperCorner>%s %s</gml:upperCorner></gml:Envelope></ogc:BBOX></ogc:Filter></Query>'%(bbox[1],bbox[0],bbox[3],bbox[2])
elif filter:
request['query'] = str(filter)
if typename:
typename = [typename] if type(typename) == type("") else typename
request['typename'] = ','.join(typename)
if propertyname:
request['propertyname'] = ','.join(propertyname)
if featureversion:
request['featureversion'] = str(featureversion)
if maxfeatures:
request['maxfeatures'] = str(maxfeatures)
if storedQueryID:
request['storedQuery_id']=str(storedQueryID)
for param in storedQueryParams:
request[param]=storedQueryParams[param]
data = urlencode(request)
if method == 'Post':
u = urlopen(base_url, data=data)
else:
u = urlopen(base_url + data)
# check for service exceptions, rewrap, and return
# We're going to assume that anything with a content-length > 32k
# is data. We'll check anything smaller.
try:
length = int(u.info()['Content-Length'])
have_read = False
except KeyError:
data = u.read()
have_read = True
length = len(data)
if length < 32000:
if not have_read:
data = u.read()
tree = etree.fromstring(data)
if tree.tag == "{%s}ServiceExceptionReport" % ns.get_versioned_namespace('ogc'):
se = tree.find(nspath('ServiceException', ns.get_versioned_namespace('ogc')))
raise ServiceException, str(se.text).strip()
return StringIO(data)
else:
if have_read:
return StringIO(data)
return u
def getpropertyvalue(self, query=None, storedquery_id=None, valuereference=None, typename=None, method=nspath('Get'),**kwargs):
''' the WFS GetPropertyValue method'''
base_url = self.get_operation_by_name('GetPropertyValue').methods[method]['url']
request = {'service': 'WFS', 'version': self.version, 'request': 'GetPropertyValue'}
if query:
request['query'] = str(query)
if valuereference:
request['valueReference'] = str(valuereference)
if storedquery_id:
request['storedQuery_id'] = str(storedquery_id)
if typename:
request['typename']=str(typename)
if kwargs:
for kw in kwargs.keys():
request[kw]=str(kwargs[kw])
data=urlencode(request)
u = urlopen(base_url + data)
return u.read()
def _getStoredQueries(self):
''' gets descriptions of the stored queries available on the server '''
sqs=[]
#This method makes two calls to the WFS - one ListStoredQueries, and one DescribeStoredQueries. The information is then
#aggregated in 'StoredQuery' objects
method=nspath('Get')
#first make the ListStoredQueries response and save the results in a dictionary if form {storedqueryid:(title, returnfeaturetype)}
base_url = self.get_operation_by_name('ListStoredQueries').methods[method]['url']
request = {'service': 'WFS', 'version': self.version, 'request': 'ListStoredQueries'}
data = urlencode(request)
u = urlopen(base_url + data)
tree=etree.fromstring(u.read())
base_url = self.get_operation_by_name('ListStoredQueries').methods[method]['url']
tempdict={}
for sqelem in tree[:]:
title=rft=id=None
id=sqelem.get('id')
for elem in sqelem[:]:
if elem.tag==nspath('Title',ns.get_namespace('wfs')):
title=elem.text
elif elem.tag==nspath('ReturnFeatureType',ns.get_namespace('wfs')):
rft=elem.text
tempdict[id]=(title,rft) #store in temporary dictionary
#then make the DescribeStoredQueries request and get the rest of the information about the stored queries
base_url = self.get_operation_by_name('DescribeStoredQueries').methods[method]['url']
request = {'service': 'WFS', 'version': self.version, 'request': 'DescribeStoredQueries'}
data = urlencode(request)
u = urlopen(base_url + data)
tree=etree.fromstring(u.read())
tempdict2={}
for sqelem in tree[:]:
params=[] #list to store parameters for the stored query description
id =sqelem.get('id')
for elem in sqelem[:]:
if elem.tag==nspath('Abstract',ns.get_namespace('wfs')):
abstract=elem.text
elif elem.tag==nspath('Parameter',ns.get_namespace('wfs')):
newparam=Parameter(elem.get('name'), elem.get('type'))
params.append(newparam)
tempdict2[id]=(abstract, params) #store in another temporary dictionary
#now group the results into StoredQuery objects:
for key in tempdict.keys():
abstract='blah'
parameters=[]
sqs.append(StoredQuery(key, tempdict[key][0], tempdict[key][1], tempdict2[key][0], tempdict2[key][1]))
return sqs
storedqueries = property(_getStoredQueries, None)
def get_operation_by_name(self, name):
"""
Return a Operation item by name, case insensitive
"""
for item in self.operations.keys():
if item.lower() == name.lower():
return self.operations[item]
raise KeyError, "No Operation named %s" % name
