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#!/usr/bin/python2.4
# Copyright 2009, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Download a file from a URL to a file on disk.
This module supports username and password with basic authentication.
"""
import base64
import os
import urllib2
def _CreateDirectory(path):
"""Create a directory tree, ignore if it's already there."""
try:
os.makedirs(path)
return True
except os.error:
return False
def HttpDownload(url, target, username=None, password=None):
"""Download a file from a remote server.
Args:
url: A URL to download from.
target: Filename to write download to.
username: Optional username for download.
password: Optional password for download (ignored if no username).
"""
headers = [('Accept', '*/*')]
if username:
if password:
auth_code = base64.b64encode(username + ':' + password)
else:
auth_code = base64.b64encode(username)
headers.append(('Authorization', 'Basic ' + auth_code))
opener = urllib2.build_opener()
opener.addheaders = headers
urllib2.install_opener(opener)
src = urllib2.urlopen(url)
data = src.read()
src.close()
_CreateDirectory(os.path.split(target)[0])
fh = open(target, 'wb')
fh.write(data)
fh.close()
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