## Amazon S3 manager
## Author: Michal Ludvig <michal@logix.cz>
## http://www.logix.cz/michal
## License: GPL Version 2
import os
import time
import re
import string
import random
import rfc822
try:
from hashlib import md5, sha1
except ImportError:
from md5 import md5
import sha as sha1
import hmac
import base64
import errno
from logging import debug, info, warning, error
import Config
import Exceptions
try:
import xml.etree.ElementTree as ET
except ImportError:
import elementtree.ElementTree as ET
from xml.parsers.expat import ExpatError
__all__ = []
def parseNodes(nodes):
## WARNING: Ignores text nodes from mixed xml/text.
## For instance <tag1>some text<tag2>other text</tag2></tag1>
## will be ignore "some text" node
retval = []
for node in nodes:
retval_item = {}
for child in node.getchildren():
name = child.tag
if child.getchildren():
retval_item[name] = parseNodes([child])
else:
retval_item[name] = node.findtext(".//%s" % child.tag)
retval.append(retval_item)
return retval
__all__.append("parseNodes")
def stripNameSpace(xml):
"""
removeNameSpace(xml) -- remove top-level AWS namespace
"""
r = re.compile('^(<?[^>]+?>\s?)(<\w+) xmlns=[\'"](http://[^\'"]+)[\'"](.*)', re.MULTILINE)
if r.match(xml):
xmlns = r.match(xml).groups()[2]
xml = r.sub("\\1\\2\\4", xml)
else:
xmlns = None
return xml, xmlns
__all__.append("stripNameSpace")
def getTreeFromXml(xml):
xml, xmlns = stripNameSpace(xml)
try:
tree = ET.fromstring(xml)
if xmlns:
tree.attrib['xmlns'] = xmlns
return tree
except ExpatError, e:
error(e)
raise Exceptions.ParameterError("Bucket contains invalid filenames. Please run: s3cmd fixbucket s3://your-bucket/")
__all__.append("getTreeFromXml")
def getListFromXml(xml, node):
tree = getTreeFromXml(xml)
nodes = tree.findall('.//%s' % (node))
return parseNodes(nodes)
__all__.append("getListFromXml")
def getDictFromTree(tree):
ret_dict = {}
for child in tree.getchildren():
if child.getchildren():
## Complex-type child. Recurse
content = getDictFromTree(child)
else:
content = child.text
if ret_dict.has_key(child.tag):
if not type(ret_dict[child.tag]) == list:
ret_dict[child.tag] = [ret_dict[child.tag]]
ret_dict[child.tag].append(content or "")
else:
ret_dict[child.tag] = content or ""
return ret_dict
__all__.append("getDictFromTree")
def getTextFromXml(xml, xpath):
tree = getTreeFromXml(xml)
if tree.tag.endswith(xpath):
return tree.text
else:
return tree.findtext(xpath)
__all__.append("getTextFromXml")
def getRootTagName(xml):
tree = getTreeFromXml(xml)
return tree.tag
__all__.append("getRootTagName")
def xmlTextNode(tag_name, text):
el = ET.Element(tag_name)
el.text = unicode(text)
return el
__all__.append("xmlTextNode")
def appendXmlTextNode(tag_name, text, parent):
"""
Creates a new <tag_name> Node and sets
its content to 'text'. Then appends the
created Node to 'parent' element if given.
Returns the newly created Node.
"""
el = xmlTextNode(tag_name, text)
parent.append(el)
return el
__all__.append("appendXmlTextNode")
def dateS3toPython(date):
date = re.compile("(\.\d*)?Z").sub(".000Z", date)
return time.strptime(date, "%Y-%m-%dT%H:%M:%S.000Z")
__all__.append("dateS3toPython")
def dateS3toUnix(date):
## FIXME: This should be timezone-aware.
## Currently the argument to strptime() is GMT but mktime()
## treats it as "localtime". Anyway...
return time.mktime(dateS3toPython(date))
__all__.append("dateS3toUnix")
def dateRFC822toPython(date):
return rfc822.parsedate(date)
__all__.append("dateRFC822toPython")
def dateRFC822toUnix(date):
return time.mktime(dateRFC822toPython(date))
__all__.append("dateRFC822toUnix")
def formatSize(size, human_readable = False, floating_point = False):
size = floating_point and float(size) or int(size)
if human_readable:
coeffs = ['k', 'M', 'G', 'T']
coeff = ""
while size > 2048:
size /= 1024
coeff = coeffs.pop(0)
return (size, coeff)
else:
return (size, "")
__all__.append("formatSize")
def formatDateTime(s3timestamp):
return time.strftime("%Y-%m-%d %H:%M", dateS3toPython(s3timestamp))
__all__.append("formatDateTime")
def convertTupleListToDict(list):
retval = {}
for tuple in list:
retval[tuple[0]] = tuple[1]
return retval
__all__.append("convertTupleListToDict")
_rnd_chars = string.ascii_letters+string.digits
_rnd_chars_len = len(_rnd_chars)
def rndstr(len):
retval = ""
while len > 0:
retval += _rnd_chars[random.randint(0, _rnd_chars_len-1)]
len -= 1
return retval
__all__.append("rndstr")
def mktmpsomething(prefix, randchars, createfunc):
old_umask = os.umask(0077)
tries = 5
while tries > 0:
dirname = prefix + rndstr(randchars)
try:
createfunc(dirname)
break
except OSError, e:
if e.errno != errno.EEXIST:
os.umask(old_umask)
raise
tries -= 1
os.umask(old_umask)
return dirname
__all__.append("mktmpsomething")
def mktmpdir(prefix = "/tmp/tmpdir-", randchars = 10):
return mktmpsomething(prefix, randchars, os.mkdir)
__all__.append("mktmpdir")
def mktmpfile(prefix = "/tmp/tmpfile-", randchars = 20):
createfunc = lambda filename : os.close(os.open(filename, os.O_CREAT | os.O_EXCL))
return mktmpsomething(prefix, randchars, createfunc)
__all__.append("mktmpfile")
def hash_file_md5(filename):
h = md5()
f = open(filename, "rb")
while True:
# Hash 32kB chunks
data = f.read(32*1024)
if not data:
break
h.update(data)
f.close()
return h.hexdigest()
__all__.append("hash_file_md5")
def mkdir_with_parents(dir_name):
"""
mkdir_with_parents(dst_dir)
Create directory 'dir_name' with all parent directories
Returns True on success, False otherwise.
"""
pathmembers = dir_name.split(os.sep)
tmp_stack = []
while pathmembers and not os.path.isdir(os.sep.join(pathmembers)):
tmp_stack.append(pathmembers.pop())
while tmp_stack:
pathmembers.append(tmp_stack.pop())
cur_dir = os.sep.join(pathmembers)
try:
debug("mkdir(%s)" % cur_dir)
os.mkdir(cur_dir)
except (OSError, IOError), e:
warning("%s: can not make directory: %s" % (cur_dir, e.strerror))
return False
except Exception, e:
warning("%s: %s" % (cur_dir, e))
return False
return True
__all__.append("mkdir_with_parents")
def unicodise(string, encoding = None, errors = "replace"):
"""
Convert 'string' to Unicode or raise an exception.
"""
if not encoding:
encoding = Config.Config().encoding
if type(string) == unicode:
return string
debug("Unicodising %r using %s" % (string, encoding))
try:
return string.decode(encoding, errors)
except UnicodeDecodeError:
raise UnicodeDecodeError("Conversion to unicode failed: %r" % string)
__all__.append("unicodise")
def deunicodise(string, encoding = None, errors = "replace"):
"""
Convert unicode 'string' to <type str>, by default replacing
all invalid characters with '?' or raise an exception.
"""
if not encoding:
encoding = Config.Config().encoding
if type(string) != unicode:
return str(string)
debug("DeUnicodising %r using %s" % (string, encoding))
try:
return string.encode(encoding, errors)
except UnicodeEncodeError:
raise UnicodeEncodeError("Conversion from unicode failed: %r" % string)
__all__.append("deunicodise")
def unicodise_safe(string, encoding = None):
"""
Convert 'string' to Unicode according to current encoding
and replace all invalid characters with '?'
"""
return unicodise(deunicodise(string, encoding), encoding).replace(u'\ufffd', '?')
__all__.append("unicodise_safe")
def replace_nonprintables(string):
"""
replace_nonprintables(string)
Replaces all non-printable characters 'ch' in 'string'
where ord(ch) <= 26 with ^@, ^A, ... ^Z
"""
new_string = ""
modified = 0
for c in string:
o = ord(c)
if (o <= 31):
new_string += "^" + chr(ord('@') + o)
modified += 1
elif (o == 127):
new_string += "^?"
modified += 1
else:
new_string += c
if modified and Config.Config().urlencoding_mode != "fixbucket":
warning("%d non-printable characters replaced in: %s" % (modified, new_string))
return new_string
__all__.append("replace_nonprintables")
def sign_string(string_to_sign):
#debug("string_to_sign: %s" % string_to_sign)
signature = base64.encodestring(hmac.new(Config.Config().secret_key, string_to_sign, sha1).digest()).strip()
#debug("signature: %s" % signature)
return signature
__all__.append("sign_string")
def check_bucket_name(bucket, dns_strict = True):
if dns_strict:
invalid = re.search("([^a-z0-9\.-])", bucket)
if invalid:
raise Exceptions.ParameterError("Bucket name '%s' contains disallowed character '%s'. The only supported ones are: lowercase us-ascii letters (a-z), digits (0-9), dot (.) and hyphen (-)." % (bucket, invalid.groups()[0]))
else:
invalid = re.search("([^A-Za-z0-9\._-])", bucket)
if invalid:
raise Exceptions.ParameterError("Bucket name '%s' contains disallowed character '%s'. The only supported ones are: us-ascii letters (a-z, A-Z), digits (0-9), dot (.), hyphen (-) and underscore (_)." % (bucket, invalid.groups()[0]))
if len(bucket) < 3:
raise Exceptions.ParameterError("Bucket name '%s' is too short (min 3 characters)" % bucket)
if len(bucket) > 255:
raise Exceptions.ParameterError("Bucket name '%s' is too long (max 255 characters)" % bucket)
if dns_strict:
if len(bucket) > 63:
raise Exceptions.ParameterError("Bucket name '%s' is too long (max 63 characters)" % bucket)
if re.search("-\.", bucket):
raise Exceptions.ParameterError("Bucket name '%s' must not contain sequence '-.' for DNS compatibility" % bucket)
if re.search("\.\.", bucket):
raise Exceptions.ParameterError("Bucket name '%s' must not contain sequence '..' for DNS compatibility" % bucket)
if not re.search("^[0-9a-z]", bucket):
raise Exceptions.ParameterError("Bucket name '%s' must start with a letter or a digit" % bucket)
if not re.search("[0-9a-z]$", bucket):
raise Exceptions.ParameterError("Bucket name '%s' must end with a letter or a digit" % bucket)
return True
__all__.append("check_bucket_name")
def check_bucket_name_dns_conformity(bucket):
try:
return check_bucket_name(bucket, dns_strict = True)
except Exceptions.ParameterError:
return False
__all__.append("check_bucket_name_dns_conformity")
def getBucketFromHostname(hostname):
"""
bucket, success = getBucketFromHostname(hostname)
Only works for hostnames derived from bucket names
using Config.host_bucket pattern.
Returns bucket name and a boolean success flag.
"""
# Create RE pattern from Config.host_bucket
pattern = Config.Config().host_bucket % { 'bucket' : '(?P<bucket>.*)' }
m = re.match(pattern, hostname)
if not m:
return (hostname, False)
return m.groups()[0], True
__all__.append("getBucketFromHostname")
def getHostnameFromBucket(bucket):
return Config.Config().host_bucket % { 'bucket' : bucket }
__all__.append("getHostnameFromBucket")
# vim:et:ts=4:sts=4:ai