/usr/lib/python2.7/dist-packages/owslib/coverage/wcsBase.py is in python-owslib 0.16.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# =============================================================================
# Copyright (c) 2004, 2006 Sean C. Gillies
# Copyright (c) 2007 STFC <http://www.stfc.ac.uk>
#
# Authors :
# Dominic Lowe <d.lowe@rl.ac.uk>
#
# Contact email: d.lowe@rl.ac.uk
# =============================================================================
from __future__ import (absolute_import, division, print_function)
try:
from urllib import urlencode
except ImportError:
from urllib.parse import urlencode
from owslib.etree import etree
import cgi
from six.moves import cStringIO as StringIO
import six
from owslib.util import openURL
class ServiceException(Exception):
"""WCS ServiceException
Attributes:
message -- short error message
xml -- full xml error message from server
"""
def __init__(self, message, xml):
self.message = message
self.xml = xml
def __str__(self):
return repr(self.message)
class WCSBase(object):
"""Base class to be subclassed by version dependent WCS classes. Provides 'high-level' version independent methods"""
def __new__(self,url, xml, cookies):
""" overridden __new__ method
@type url: string
@param url: url of WCS capabilities document
@type xml: string
@param xml: elementtree object
@return: inititalised WCSBase object
"""
obj=object.__new__(self)
obj.__init__(url, xml, cookies)
self.cookies=cookies
self._describeCoverage = {} #cache for DescribeCoverage responses
return obj
def __init__(self):
pass
def getDescribeCoverage(self, identifier):
''' returns a describe coverage document - checks the internal cache to see if it has been fetched before '''
if identifier not in self._describeCoverage.keys():
reader = DescribeCoverageReader(self.version, identifier, self.cookies)
self._describeCoverage[identifier] = reader.read(self.url)
return self._describeCoverage[identifier]
class WCSCapabilitiesReader(object):
"""Read and parses WCS capabilities document into a lxml.etree infoset
"""
def __init__(self, version=None, cookies = None):
"""Initialize
@type version: string
@param version: WCS Version parameter e.g '1.0.0'
"""
self.version = version
self._infoset = None
self.cookies = cookies
def capabilities_url(self, service_url):
"""Return a capabilities url
@type service_url: string
@param service_url: base url of WCS service
@rtype: string
@return: getCapabilities URL
"""
qs = []
if service_url.find('?') != -1:
qs = cgi.parse_qsl(service_url.split('?')[1])
params = [x[0] for x in qs]
if 'service' not in params:
qs.append(('service', 'WCS'))
if 'request' not in params:
qs.append(('request', 'GetCapabilities'))
if ('version' not in params) and (self.version is not None):
qs.append(('version', self.version))
urlqs = urlencode(tuple(qs))
return service_url.split('?')[0] + '?' + urlqs
def read(self, service_url, timeout=30):
"""Get and parse a WCS capabilities document, returning an
elementtree tree
@type service_url: string
@param service_url: The base url, to which is appended the service,
version, and request parameters
@rtype: elementtree tree
@return: An elementtree tree representation of the capabilities document
"""
request = self.capabilities_url(service_url)
u = openURL(request, timeout=timeout, cookies=self.cookies)
return etree.fromstring(u.read())
def readString(self, st):
"""Parse a WCS capabilities document, returning an
instance of WCSCapabilitiesInfoset
string should be an XML capabilities document
"""
return etree.fromstring(st)
class DescribeCoverageReader(object):
"""Read and parses WCS DescribeCoverage document into a lxml.etree infoset
"""
def __init__(self, version, identifier, cookies):
"""Initialize
@type version: string
@param version: WCS Version parameter e.g '1.0.0'
"""
self.version = version
self._infoset = None
self.identifier=identifier
self.cookies = cookies
def descCov_url(self, service_url):
"""Return a describe coverage url
@type service_url: string
@param service_url: base url of WCS service
@rtype: string
@return: getCapabilities URL
"""
qs = []
if service_url.find('?') != -1:
qs = cgi.parse_qsl(service_url.split('?')[1])
params = [x[0] for x in qs]
if 'service' not in params:
qs.append(('service', 'WCS'))
if 'request' not in params:
qs.append(('request', 'DescribeCoverage'))
if 'version' not in params:
qs.append(('version', self.version))
if self.version == '1.0.0':
if 'coverage' not in params:
qs.append(('coverage', self.identifier))
elif self.version == '1.1.0' or self.version == '1.1.1':
#NOTE: WCS 1.1.0 is ambigous about whether it should be identifier
#or identifiers (see tables 9, 10 of specification)
if 'identifiers' not in params:
qs.append(('identifiers', self.identifier))
if 'identifier' not in params:
qs.append(('identifier', self.identifier))
qs.append(('format', 'text/xml'))
urlqs = urlencode(tuple(qs))
return service_url.split('?')[0] + '?' + urlqs
def read(self, service_url, timeout=30):
"""Get and parse a Describe Coverage document, returning an
elementtree tree
@type service_url: string
@param service_url: The base url, to which is appended the service,
version, and request parameters
@rtype: elementtree tree
@return: An elementtree tree representation of the capabilities document
"""
request = self.descCov_url(service_url)
u = openURL(request, cookies=self.cookies, timeout=timeout)
return etree.fromstring(u.read())
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