Hi,
Using OWSLib with authentication fails on the latest build. I noticed that the
code to do Basic HTTP authentication was recently moved to util.py from wms.py.
It looks like when this happened a few old variable names came along for the
ride, specifically the section:
if username and password:
# Provide login information in order to use the WMS server
# Create an OpenerDirector with support for Basic HTTP
# Authentication...
passman = HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, self.url, self.username, self.password)
auth_handler = HTTPBasicAuthHandler(passman)
opener = build_opener(auth_handler)
openit = opener.open
else:
openit = urlopen
should probably be:
if username and password:
# Provide login information in order to use the WMS server
# Create an OpenerDirector with support for Basic HTTP
# Authentication...
passman = HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, url_base, username, password)
auth_handler = HTTPBasicAuthHandler(passman)
opener = urllib2.build_opener(auth_handler)
openit = opener.open
else:
openit = urlopen
Anyway this seems to fix the problem (I have attached the util.py file). Does
this make sense? I could be missing something...
Thanks,
Angus
__________________________________________________________________
Looking for the perfect gift? Give the gift of Flickr!
http://www.flickr.com/gift/#!/usr/bin/python
# -*- coding: ISO-8859-15 -*-
# =============================================================================
# Copyright (c) 2008 Tom Kralidis
#
# Authors : Tom Kralidis <[email protected]>
#
# Contact email: [email protected]
# =============================================================================
from owslib.etree import etree
import urlparse, urllib2
from urllib2 import urlopen, HTTPError, Request
from urllib2 import HTTPPasswordMgrWithDefaultRealm
from urllib2 import HTTPBasicAuthHandler
from StringIO import StringIO
"""
Utility functions and classes
"""
class RereadableURL(StringIO,object):
""" Class that acts like a combination of StringIO and url - has seek method and url headers etc """
def __init__(self, u):
#get url headers etc from url
self.headers = u.headers
#get file like seek, read methods from StringIO
content=u.read()
super(RereadableURL, self).__init__(content)
class ServiceException(Exception):
#TODO: this should go in ows common module when refactored.
pass
def openURL(url_base, data, method='Get', cookies=None, username=None, password=None):
''' function to open urls - wrapper around urllib2.urlopen but with additional checks for OGC service exceptions and url formatting, also handles cookies and simple user password authentication'''
url_base.strip()
lastchar = url_base[-1]
if lastchar not in ['?', '&']:
if url_base.find('?') == -1:
url_base = url_base + '?'
else:
url_base = url_base + '&'
if username and password:
# Provide login information in order to use the WMS server
# Create an OpenerDirector with support for Basic HTTP
# Authentication...
passman = HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, url_base, username, password)
auth_handler = HTTPBasicAuthHandler(passman)
opener = urllib2.build_opener(auth_handler)
openit = opener.open
else:
openit = urlopen
try:
if method == 'Post':
req = Request(url_base, data)
else:
req=Request(url_base + data)
if cookies is not None:
req.add_header('Cookie', cookies)
u = openit(req)
except HTTPError, e: #Some servers may set the http header to 400 if returning an OGC service exception or 401 if unauthorised.
if e.code in [400, 401]:
raise ServiceException, e.read()
else:
raise e
# check for service exceptions without the http header set
if u.info()['Content-Type'] in ['text/xml', 'application/xml']:
#just in case 400 headers were not set, going to have to read the xml to see if it's an exception report.
#wrap the url stram in a extended StringIO object so it's re-readable
u=RereadableURL(u)
se_xml= u.read()
se_tree = etree.fromstring(se_xml)
serviceException=se_tree.find('{http://www.opengis.net/ows}Exception')
if serviceException is None:
serviceException=se_tree.find('ServiceException')
if serviceException is not None:
raise ServiceException, \
str(serviceException.text).strip()
u.seek(0) #return cursor to start of u
return u
#default namespace for nspath is OWS common
OWS_NAMESPACE = 'http://www.opengis.net/ows/1.1'
def nspath(path, ns=OWS_NAMESPACE):
"""
Prefix the given path with the given namespace identifier.
Parameters
----------
- path: ElementTree API Compatible path expression
- ns: the XML namespace URI.
"""
if ns is None or path is None:
return -1
components = []
for component in path.split('/'):
if component != '*':
component = '{%s}%s' % (ns, component)
components.append(component)
return '/'.join(components)
def testXMLValue(val, attrib=False):
"""
Test that the XML value exists, return val.text, else return None
Parameters
----------
- val: the value to be tested
"""
if val is not None:
if attrib == True:
return val
else:
return val.text
else:
return None
def http_post(url=None, request=None, lang='en-US'):
"""
Invoke an HTTP POST request
Parameters
----------
- url: the URL of the server
- request: the request message
- lang: the language
"""
if url is not None:
u = urlparse.urlsplit(url)
r = urllib2.Request(url, request)
r.add_header('User-Agent', 'OWSLib (http://trac.gispython.org/lab/wiki/OwsLib)')
r.add_header('Content-type', 'text/xml')
r.add_header('Content-length', '%d' % len(request))
r.add_header('Accept', 'text/xml')
r.add_header('Accept-Language', lang)
r.add_header('Accept-Encoding', 'gzip,deflate')
r.add_header('Host', u.netloc)
up = urllib2.urlopen(r)
response = up.read()
up.close()
return response
def xml2string(xml):
"""
Return a string of XML object
Parameters
----------
- xml: xml string
"""
return '<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>\n' + xml
def xmlvalid(xml, xsd):
"""
Test whether an XML document is valid
Parameters
----------
- xml: XML content
- xsd: pointer to XML Schema (local file path or URL)
"""
xsd1 = etree.parse(xsd)
xsd2 = etree.XMLSchema(xsd1)
doc = etree.parse(StringIO.StringIO(xml))
return xsd2.validate(doc)
_______________________________________________
Community mailing list
[email protected]
http://lists.gispython.org/mailman/listinfo/community
