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""" __author__ = "P J Kershaw" __date__ = "21/12/10" __copyright__ = "(C) 2011 Science and Technology Facilities Council" __license__ = "BSD - see LICENSE file in top-level directory" __contact__ = "Philip.Kershaw@stfc.ac.uk" __revision__ = '$Id$' import logging import sys # Py 2 <=> 3 compatibility for class type checking if sys.version_info[0] > 2: class_type_ = type from urllib.request import (ProxyHandler, UnknownHandler, HTTPDefaultErrorHandler, FTPHandler, FileHandler, HTTPErrorProcessor, HTTPHandler, OpenerDirector, HTTPRedirectHandler) else: import types class_type_ = types.ClassType from urllib2 import (ProxyHandler, UnknownHandler, HTTPDefaultErrorHandler, FTPHandler, FileHandler, HTTPErrorProcessor, HTTPHandler, OpenerDirector, HTTPRedirectHandler) from ndg.httpsclient.https import HTTPSContextHandler log = logging.getLogger(__name__) # Copied from urllib2 with modifications for ssl def build_opener(*handlers, **kw): """Create an opener object from a list of handlers. The opener will use several default handlers, including support for HTTP and FTP. If any of the handlers passed as arguments are subclasses of the default handlers, the default handlers will not be used. """ def isclass(obj): return isinstance(obj, class_type_) or hasattr(obj, "__bases__") opener = OpenerDirector() default_classes = [ProxyHandler, UnknownHandler, HTTPHandler, HTTPDefaultErrorHandler, HTTPRedirectHandler, FTPHandler, FileHandler, HTTPErrorProcessor] check_classes = list(default_classes) check_classes.append(HTTPSContextHandler) skip = [] for klass in check_classes: for check in handlers: if isclass(check): if issubclass(check, klass): skip.append(klass) elif isinstance(check, klass): skip.append(klass) for klass in default_classes: if klass not in skip: opener.add_handler(klass()) # Pick up SSL context from keyword settings ssl_context = kw.get('ssl_context') # Add the HTTPS handler with ssl_context if HTTPSContextHandler not in skip: opener.add_handler(HTTPSContextHandler(ssl_context)) for h in handlers: if isclass(h): h = h() opener.add_handler(h) return opener