/usr/lib/python3/dist-packages/owslib/map/wms130.py is in python3-owslib 0.16.0-1.
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# =============================================================================
# Copyright (c) 2004, 2006 Sean C. Gillies
# Copyright (c) 2005 Nuxeo SARL <http://nuxeo.com>
#
# Authors : Sean Gillies <sgillies@frii.com>
# Julien Anguenot <ja@nuxeo.com>
#
# Contact email: sgillies@frii.com
# =============================================================================
"""
API For Web Map Service version 1.3.0.
"""
from __future__ import (absolute_import, division, print_function)
try: # Python 3
from urllib.parse import urlencode
except ImportError: # Python 2
from urllib import urlencode
import warnings
import six
from owslib.etree import etree
from owslib.util import (openURL, ServiceException, testXMLValue,
extract_xml_list, xmltag_split, OrderedDict, nspath,
bind_url)
from owslib.util import nspath
from owslib.fgdc import Metadata
from owslib.iso import MD_Metadata
from owslib.crs import Crs
from owslib.namespaces import Namespaces
from owslib.map.common import WMSCapabilitiesReader
from owslib.util import log
n = Namespaces()
WMS_NAMESPACE = n.get_namespace("wms")
OGC_NAMESPACE = n.get_namespace('ogc')
class WebMapService_1_3_0(object):
def __getitem__(self, name):
''' check contents dictionary to allow dict
like access to service layers
'''
if name in self.__getattribute__('contents'):
return self.__getattribute__('contents')[name]
else:
raise KeyError("No content named %s" % name)
def __init__(self, url, version='1.3.0', xml=None, username=None,
password=None, parse_remote_metadata=False, timeout=30,
headers=None):
"""initialize"""
self.url = url
self.username = username
self.password = password
self.version = version
self.timeout = timeout
self.headers = headers
self._capabilities = None
# Authentication handled by Reader
reader = WMSCapabilitiesReader(self.version, url=self.url,
un=self.username, pw=self.password,
headers=headers)
if xml: # read from stored xml
self._capabilities = reader.readString(xml)
else: # read from server
self._capabilities = reader.read(self.url, timeout=self.timeout)
self.request = reader.request
# avoid building capabilities metadata if the
# response is a ServiceExceptionReport
se = self._capabilities.find('ServiceException')
if se is not None:
err_message = str(se.text).strip()
raise ServiceException(err_message)
# build metadata objects
self._buildMetadata(parse_remote_metadata)
def _buildMetadata(self, parse_remote_metadata=False):
'''set up capabilities metadata objects:'''
self.updateSequence = self._capabilities.attrib.get('updateSequence')
# serviceIdentification metadata
serviceelem = self._capabilities.find(nspath('Service',
ns=WMS_NAMESPACE))
self.identification = ServiceIdentification(serviceelem, self.version)
# serviceProvider metadata
self.provider = ServiceProvider(serviceelem)
# serviceOperations metadata
self.operations = []
for elem in self._capabilities.find(nspath('Capability/Request',
ns=WMS_NAMESPACE))[:]:
self.operations.append(OperationMetadata(elem))
# serviceContents metadata: our assumption is that services use a top-level
# layer as a metadata organizer, nothing more.
self.contents = OrderedDict()
caps = self._capabilities.find(nspath('Capability', WMS_NAMESPACE))
# recursively gather content metadata for all layer elements.
# To the WebMapService.contents store only metadata of named layers.
def gather_layers(parent_elem, parent_metadata):
layers = []
for index, elem in enumerate(parent_elem.findall(nspath('Layer', WMS_NAMESPACE))):
cm = ContentMetadata(elem, parent=parent_metadata, index=index+1,
parse_remote_metadata=parse_remote_metadata)
if cm.id:
if cm.id in self.contents:
warnings.warn('Content metadata for layer "%s" already exists. Using child layer' % cm.id)
layers.append(cm)
self.contents[cm.id] = cm
cm.children = gather_layers(elem, cm)
return layers
gather_layers(caps, None)
# exceptions
self.exceptions = [f.text for f
in self._capabilities.findall(nspath('Capability/Exception/Format',
WMS_NAMESPACE))]
def items(self):
'''supports dict-like items() access'''
items = []
for item in self.contents:
items.append((item, self.contents[item]))
return items
def getServiceXML(self):
xml = None
if self._capabilities is not None:
xml = etree.tostring(self._capabilities)
return xml
def getOperationByName(self, name):
"""Return a named content item."""
for item in self.operations:
if item.name == name:
return item
raise KeyError("No operation named %s" % name)
def __build_getmap_request(self, layers=None, styles=None, srs=None, bbox=None,
format=None, size=None, time=None, dimensions={},
elevation=None, transparent=False,
bgcolor=None, exceptions=None, **kwargs):
request = {'service': 'WMS', 'version': self.version, 'request': 'GetMap'}
# check layers and styles
assert len(layers) > 0
request['layers'] = ','.join(layers)
if styles:
assert len(styles) == len(layers)
request['styles'] = ','.join(styles)
else:
request['styles'] = ''
# size
request['width'] = str(size[0])
request['height'] = str(size[1])
# remap srs to crs for the actual request
if srs.upper() == 'EPSG:0':
# if it's esri's unknown spatial ref code, bail
raise Exception('Undefined spatial reference (%s).' % srs)
sref = Crs(srs)
if sref.axisorder == 'yx':
# remap the given bbox
bbox = (bbox[1], bbox[0], bbox[3], bbox[2])
# remapping the srs to crs for the request
request['crs'] = str(srs)
request['bbox'] = ','.join([repr(x) for x in bbox])
request['format'] = str(format)
request['transparent'] = str(transparent).upper()
request['bgcolor'] = '0x' + bgcolor[1:7]
request['exceptions'] = str(exceptions)
if time is not None:
request['time'] = str(time)
if elevation is not None:
request['elevation'] = str(elevation)
# any other specified dimension, prefixed with "dim_"
for k, v in six.iteritems(dimensions):
request['dim_' + k] = str(v)
if kwargs:
for kw in kwargs:
request[kw]=kwargs[kw]
return request
def getmap(self, layers=None,
styles=None,
srs=None,
bbox=None,
format=None,
size=None,
time=None,
elevation=None,
dimensions={},
transparent=False,
bgcolor='#FFFFFF',
exceptions='XML',
method='Get',
timeout=None,
**kwargs
):
"""Request and return an image from the WMS as a file-like object.
Parameters
----------
layers : list
List of content layer names.
styles : list
Optional list of named styles, must be the same length as the
layers list.
srs : string
A spatial reference system identifier.
Note: this is an invalid query parameter key for 1.3.0 but is being
retained for standardization with 1.1.1.
Note: throws exception if the spatial ref is ESRI's "no reference"
code (EPSG:0)
bbox : tuple
(left, bottom, right, top) in srs units (note, this order does not
change depending on axis order of the crs).
CRS:84: (long, lat)
EPSG:4326: (lat, long)
format : string
Output image format such as 'image/jpeg'.
size : tuple
(width, height) in pixels.
time : string or list or range
Optional. Time value of the specified layer as ISO-8601 (per value)
elevation : string or list or range
Optional. Elevation value of the specified layer.
dimensions: dict (dimension : string or list or range)
Optional. Any other Dimension option, as specified in the GetCapabilities
transparent : bool
Optional. Transparent background if True.
bgcolor : string
Optional. Image background color.
method : string
Optional. HTTP DCP method name: Get or Post.
**kwargs : extra arguments
anything else e.g. vendor specific parameters
Example
-------
wms = WebMapService('http://webservices.nationalatlas.gov/wms/1million',\
version='1.3.0')
img = wms.getmap(layers=['airports1m'],\
styles=['default'],\
srs='EPSG:4326',\
bbox=(-176.646, 17.7016, -64.8017, 71.2854),\
size=(300, 300),\
format='image/jpeg',\
transparent=True)
out = open('example.jpg.jpg', 'wb')
out.write(img.read())
out.close()
"""
try:
base_url = next((m.get('url') for m in
self.getOperationByName('GetMap').methods if
m.get('type').lower() == method.lower()))
except StopIteration:
base_url = self.url
request = self.__build_getmap_request(
layers=layers,
styles=styles,
srs=srs,
bbox=bbox,
dimensions=dimensions,
elevation=elevation,
format=format,
size=size,
time=time,
transparent=transparent,
bgcolor=bgcolor,
exceptions=exceptions,
**kwargs)
data = urlencode(request)
self.request = bind_url(base_url) + data
u = openURL(base_url,
data,
method,
username=self.username,
password=self.password,
timeout=timeout or self.timeout)
# need to handle casing in the header keys
headers = {}
for k, v in six.iteritems(u.info()):
headers[k.lower()] = v
# handle the potential charset def
if headers['content-type'].split(';')[0] in ['application/vnd.ogc.se_xml', 'text/xml']:
se_xml = u.read()
se_tree = etree.fromstring(se_xml)
err_message = six.text_type(se_tree.find(nspath('ServiceException', OGC_NAMESPACE)).text).strip()
raise ServiceException(err_message)
return u
def getfeatureinfo(self, layers=None,
styles=None,
srs=None,
bbox=None,
format=None,
size=None,
time=None,
elevation=None,
dimensions={},
transparent=False,
bgcolor='#FFFFFF',
exceptions='XML',
query_layers=None,
xy=None,
info_format=None,
feature_count=20,
method='Get',
timeout=None,
**kwargs
):
try:
base_url = next((m.get('url') for m in self.getOperationByName('GetFeatureInfo').methods if m.get('type').lower() == method.lower()))
except StopIteration:
base_url = self.url
# GetMap-Request
request = self.__build_getmap_request(
layers=layers,
styles=styles,
srs=srs,
bbox=bbox,
dimensions=dimensions,
elevation=elevation,
format=format,
size=size,
time=time,
transparent=transparent,
bgcolor=bgcolor,
exceptions=exceptions,
kwargs=kwargs)
# extend to GetFeatureInfo-Request
request['request'] = 'GetFeatureInfo'
if not query_layers:
__str_query_layers = ','.join(layers)
else:
__str_query_layers = ','.join(query_layers)
request['query_layers'] = __str_query_layers
request['i'] = str(xy[0])
request['j'] = str(xy[1])
request['info_format'] = info_format
request['feature_count'] = str(feature_count)
data = urlencode(request)
self.request = bind_url(base_url) + data
u = openURL(base_url, data, method, username=self.username, password=self.password, timeout=timeout or self.timeout)
# check for service exceptions, and return
if u.info()['Content-Type'] == 'XML':
se_xml = u.read()
se_tree = etree.fromstring(se_xml)
err_message = six.text_type(se_tree.find('ServiceException').text).strip()
raise ServiceException(err_message)
return u
class ServiceIdentification(object):
def __init__(self, infoset, version):
self._root = infoset
self.type = testXMLValue(self._root.find(nspath('Name', WMS_NAMESPACE)))
self.version = version
self.title = testXMLValue(self._root.find(nspath('Title', WMS_NAMESPACE)))
self.abstract = testXMLValue(self._root.find(nspath('Abstract', WMS_NAMESPACE)))
self.keywords = extract_xml_list(self._root.findall(nspath('KeywordList/Keyword', WMS_NAMESPACE)))
self.accessconstraints = testXMLValue(self._root.find(nspath('AccessConstraints', WMS_NAMESPACE)))
self.fees = testXMLValue(self._root.find(nspath('Fees', WMS_NAMESPACE)))
class ServiceProvider(object):
def __init__(self, infoset):
self._root = infoset
name = self._root.find(nspath('ContactInformation/ContactPersonPrimary/ContactOrganization', WMS_NAMESPACE))
if name is not None:
self.name = name.text
else:
self.name = None
self.url = self._root.find(nspath('OnlineResource', WMS_NAMESPACE)).attrib.get('{http://www.w3.org/1999/xlink}href', '')
# contact metadata
contact = self._root.find(nspath('ContactInformation', WMS_NAMESPACE))
# sometimes there is a contact block that is empty, so make
# sure there are children to parse
if contact is not None and contact[:] != []:
self.contact = ContactMetadata(contact)
else:
self.contact = None
class ContentMetadata(object):
def __init__(self, elem, parent=None, children=None, index=0, parse_remote_metadata=False, timeout=30):
if xmltag_split(elem.tag) != 'Layer':
raise ValueError('%s should be a Layer' % (elem,))
self.parent = parent
if parent:
self.index = "%s.%d" % (parent.index, index)
else:
self.index = str(index)
self._children = children
self.id = self.name = testXMLValue(elem.find(nspath('Name', WMS_NAMESPACE)))
# layer attributes
self.queryable = int(elem.attrib.get('queryable', 0))
self.cascaded = int(elem.attrib.get('cascaded', 0))
self.opaque = int(elem.attrib.get('opaque', 0))
self.noSubsets = int(elem.attrib.get('noSubsets', 0))
self.fixedWidth = int(elem.attrib.get('fixedWidth', 0))
self.fixedHeight = int(elem.attrib.get('fixedHeight', 0))
# title is mandatory property
self.title = None
title = testXMLValue(elem.find(nspath('Title', WMS_NAMESPACE)))
if title is not None:
self.title = title.strip()
self.abstract = testXMLValue(elem.find(nspath('Abstract', WMS_NAMESPACE)))
# TODO: what is the preferred response to esri's handling of custom projections
# in the spatial ref definitions? see http://resources.arcgis.com/en/help/main/10.1/index.html#//00sq000000m1000000
# and an example (20150812) http://maps.ngdc.noaa.gov/arcgis/services/firedetects/MapServer/WMSServer?request=GetCapabilities&service=WMS
# bboxes
b = elem.find(nspath('EX_GeographicBoundingBox', WMS_NAMESPACE))
self.boundingBoxWGS84 = None
if b is not None:
minx = b.find(nspath('westBoundLongitude', WMS_NAMESPACE))
miny = b.find(nspath('southBoundLatitude', WMS_NAMESPACE))
maxx = b.find(nspath('eastBoundLongitude', WMS_NAMESPACE))
maxy = b.find(nspath('northBoundLatitude', WMS_NAMESPACE))
box = tuple(map(float, [minx.text if minx is not None else None,
miny.text if miny is not None else None,
maxx.text if maxx is not None else None,
maxy.text if maxy is not None else None]))
self.boundingBoxWGS84 = tuple(box)
elif self.parent:
if hasattr(self.parent, 'boundingBoxWGS84'):
self.boundingBoxWGS84 = self.parent.boundingBoxWGS84
# make a bbox list (of tuples)
crs_list = []
for bb in elem.findall(nspath('BoundingBox', WMS_NAMESPACE)):
srs_str = bb.attrib.get('CRS', None)
srs = Crs(srs_str)
box = tuple(map(float, [bb.attrib['minx'],
bb.attrib['miny'],
bb.attrib['maxx'],
bb.attrib['maxy']]
))
minx, miny, maxx, maxy = box[0], box[1], box[2], box[3]
# handle the ordering so that it always
# returns (minx, miny, maxx, maxy)
if srs and srs.axisorder == 'yx':
# reverse things
minx, miny, maxx, maxy = box[1], box[0], box[3], box[2]
crs_list.append((
minx, miny, maxx, maxy,
srs_str,
))
self.crs_list = crs_list
# and maintain the original boundingBox attribute (first in list)
# or the wgs84 bbox (to handle cases of incomplete parentage)
self.boundingBox = crs_list[0] if crs_list else self.boundingBoxWGS84
# ScaleHint
sh = elem.find(nspath('ScaleHint', WMS_NAMESPACE))
self.scaleHint = None
if sh is not None:
if 'min' in sh.attrib and 'max' in sh.attrib:
self.scaleHint = {'min': sh.attrib['min'], 'max': sh.attrib['max']}
attribution = elem.find(nspath('Attribution', WMS_NAMESPACE))
if attribution is not None:
self.attribution = dict()
title = attribution.find(nspath('Title', WMS_NAMESPACE))
url = attribution.find(nspath('OnlineResource', WMS_NAMESPACE))
logo = attribution.find(nspath('LogoURL', WMS_NAMESPACE))
if title is not None:
self.attribution['title'] = title.text
if url is not None:
self.attribution['url'] = url.attrib['{http://www.w3.org/1999/xlink}href']
if logo is not None:
self.attribution['logo_size'] = (int(logo.attrib['width']), int(logo.attrib['height']))
self.attribution['logo_url'] = logo.find(nspath('OnlineResource', WMS_NAMESPACE)).attrib['{http://www.w3.org/1999/xlink}href']
# TODO: get this from the bbox attributes instead (deal with parents)
# SRS options
self.crsOptions = []
# Copy any parent SRS options (they are inheritable properties)
if self.parent:
self.crsOptions = list(self.parent.crsOptions)
# Look for SRS option attached to this layer
if elem.find(nspath('CRS', WMS_NAMESPACE)) is not None:
# some servers found in the wild use a single SRS
# tag containing a whitespace separated list of SRIDs
# instead of several SRS tags. hence the inner loop
for srslist in map(lambda x: x.text, elem.findall(nspath('CRS', WMS_NAMESPACE))):
if srslist:
for srs in srslist.split():
self.crsOptions.append(srs)
# Get rid of duplicate entries
self.crsOptions = list(set(self.crsOptions))
# Set self.crsOptions to None if the layer (and parents) had no SRS options
if len(self.crsOptions) == 0:
# raise ValueError('%s no SRS available!?' % (elem,))
# Comment by D Lowe.
# Do not raise ValueError as it is possible that a layer is purely a parent layer and does not have SRS specified. Instead set crsOptions to None
# Comment by Jachym:
# Do not set it to None, but to [], which will make the code
# work further. Fixed by anthonybaxter
self.crsOptions = []
# Styles
self.styles = {}
# Copy any parent styles (they are inheritable properties)
if self.parent:
self.styles = self.parent.styles.copy()
# Get the styles for this layer (items with the same name are replaced)
for s in elem.findall(nspath('Style', WMS_NAMESPACE)):
name = s.find(nspath('Name', WMS_NAMESPACE))
title = s.find(nspath('Title', WMS_NAMESPACE))
if name is None or title is None:
raise ValueError('%s missing name or title' % (s,))
style = {'title': title.text}
# legend url
legend = s.find(nspath('LegendURL/OnlineResource', WMS_NAMESPACE))
if legend is not None:
style['legend'] = legend.attrib['{http://www.w3.org/1999/xlink}href']
lgd = s.find(nspath('LegendURL', WMS_NAMESPACE))
if lgd is not None:
if 'width' in lgd.attrib.keys():
style['legend_width'] = lgd.attrib.get('width')
if 'height' in lgd.attrib.keys():
style['legend_height'] = lgd.attrib.get('height')
lgd_format = lgd.find(nspath('Format', WMS_NAMESPACE))
if lgd_format is not None:
style['legend_format'] = lgd_format.text.strip()
self.styles[name.text] = style
# keywords
self.keywords = [f.text for f in elem.findall(nspath('KeywordList/Keyword', WMS_NAMESPACE))]
# extents replaced by dimensions of name
# comment by Soren Scott
# <Dimension name="elevation" units="meters" default="500" multipleValues="1"
# nearestValue="0" current="true" unitSymbol="m">500, 490, 480</Dimension>
# it can be repeated with the same name so ? this assumes a single one to match 1.1.1
self.timepositions = None
self.defaulttimeposition = None
time_dimension = None
for dim in elem.findall(nspath('Dimension', WMS_NAMESPACE)):
dim_name = dim.attrib.get('name')
if dim_name is not None and dim_name.lower() == 'time':
time_dimension = dim
if time_dimension is not None:
self.timepositions = time_dimension.text.split(',') if time_dimension.text else None
self.defaulttimeposition = time_dimension.attrib.get('default', None)
# Elevations - available vertical levels
self.elevations = None
elev_dimension = None
for dim in elem.findall(nspath('Dimension', WMS_NAMESPACE)):
if dim.attrib.get('name') == 'elevation':
elev_dimension = dim
if elev_dimension is not None:
self.elevations = [e.strip() for e in elev_dimension.text.split(',')] if elev_dimension.text else None
# and now capture the dimensions as more generic things (and custom things)
self.dimensions = {}
for dim in elem.findall(nspath('Dimension', WMS_NAMESPACE)):
dim_name = dim.attrib.get('name')
dim_data = {}
for k, v in six.iteritems(dim.attrib):
if k != 'name':
dim_data[k] = v
# single values and ranges are not differentiated here
dim_data['values'] = dim.text.strip().split(',') if dim.text.strip() else None
self.dimensions[dim_name] = dim_data
# MetadataURLs
self.metadataUrls = []
for m in elem.findall(nspath('MetadataURL', WMS_NAMESPACE)):
metadataUrl = {
'type': testXMLValue(m.attrib['type'], attrib=True),
'format': testXMLValue(m.find(nspath('Format', WMS_NAMESPACE))),
'url': testXMLValue(m.find(nspath('OnlineResource', WMS_NAMESPACE)).attrib['{http://www.w3.org/1999/xlink}href'], attrib=True)
}
if metadataUrl['url'] is not None and parse_remote_metadata: # download URL
try:
content = openURL(metadataUrl['url'], timeout=timeout)
doc = etree.parse(content)
if metadataUrl['type'] is not None:
if metadataUrl['type'] == 'FGDC':
metadataUrl['metadata'] = Metadata(doc)
if metadataUrl['type'] == 'TC211':
metadataUrl['metadata'] = MD_Metadata(doc)
except Exception:
metadataUrl['metadata'] = None
self.metadataUrls.append(metadataUrl)
# DataURLs
self.dataUrls = []
for m in elem.findall(nspath('DataURL', WMS_NAMESPACE)):
dataUrl = {
'format': m.find(nspath('Format', WMS_NAMESPACE)).text.strip(),
'url': m.find(nspath('OnlineResource', WMS_NAMESPACE)).attrib['{http://www.w3.org/1999/xlink}href']
}
self.dataUrls.append(dataUrl)
# FeatureListURLs
self.featureListUrls = []
for m in elem.findall(nspath('FeatureListURL', WMS_NAMESPACE)):
featureUrl = {
'format': m.find(nspath('Format', WMS_NAMESPACE)).text.strip(),
'url': m.find(nspath('OnlineResource', WMS_NAMESPACE)).attrib['{http://www.w3.org/1999/xlink}href']
}
self.featureListUrls.append(featureUrl)
self.layers = []
for child in elem.findall(nspath('Layer', WMS_NAMESPACE)):
self.layers.append(ContentMetadata(child, self))
@property
def children(self):
return self._children
@children.setter
def children(self, value):
if self._children is None:
self._children = value
else:
self._children.extend(value)
def __str__(self):
return 'Layer Name: %s Title: %s' % (self.name, self.title)
class OperationMetadata(object):
def __init__(self, elem):
"""."""
self.name = xmltag_split(elem.tag)
# formatOptions
self.formatOptions = [f.text for f in elem.findall(nspath('Format', WMS_NAMESPACE))]
self.methods = []
for verb in elem.findall(nspath('DCPType/HTTP/*', WMS_NAMESPACE)):
url = verb.find(nspath('OnlineResource', WMS_NAMESPACE)).attrib['{http://www.w3.org/1999/xlink}href']
self.methods.append({'type': xmltag_split(verb.tag), 'url': url})
class ContactMetadata(object):
def __init__(self, elem):
name = elem.find(nspath('ContactPersonPrimary/ContactPerson', WMS_NAMESPACE))
if name is not None:
self.name = name.text
else:
self.name = None
email = elem.find('ContactElectronicMailAddress')
if email is not None:
self.email = email.text
else:
self.email = None
self.address = self.city = self.region = None
self.postcode = self.country = None
address = elem.find(nspath('ContactAddress', WMS_NAMESPACE))
if address is not None:
street = address.find(nspath('Address', WMS_NAMESPACE))
if street is not None:
self.address = street.text
city = address.find(nspath('City', WMS_NAMESPACE))
if city is not None:
self.city = city.text
region = address.find(nspath('StateOrProvince', WMS_NAMESPACE))
if region is not None:
self.region = region.text
postcode = address.find(nspath('PostCode', WMS_NAMESPACE))
if postcode is not None:
self.postcode = postcode.text
country = address.find(nspath('Country', WMS_NAMESPACE))
if country is not None:
self.country = country.text
organization = elem.find(nspath('ContactPersonPrimary/ContactOrganization', WMS_NAMESPACE))
if organization is not None:
self.organization = organization.text
else:
self.organization = None
position = elem.find(nspath('ContactPosition', WMS_NAMESPACE))
if position is not None:
self.position = position.text
else:
self.position = None
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