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## Amazon S3 manager
## Author: Michal Ludvig <michal@logix.cz>
## http://www.logix.cz/michal
## License: GPL Version 2
import os
import re
import sys
from BidirMap import BidirMap
from logging import debug
import S3
from Utils import unicodise, check_bucket_name_dns_conformity
import Config
class S3Uri(object):
type = None
_subclasses = None
def __new__(self, string):
if not self._subclasses:
## Generate a list of all subclasses of S3Uri
self._subclasses = []
dict = sys.modules[__name__].__dict__
for something in dict:
if type(dict[something]) is not type(self):
continue
if issubclass(dict[something], self) and dict[something] != self:
self._subclasses.append(dict[something])
for subclass in self._subclasses:
try:
instance = object.__new__(subclass)
instance.__init__(string)
return instance
except ValueError, e:
continue
raise ValueError("%s: not a recognized URI" % string)
def __str__(self):
return self.uri()
def __unicode__(self):
return self.uri()
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self.__unicode__())
def public_url(self):
raise ValueError("This S3 URI does not have Anonymous URL representation")
def basename(self):
return self.__unicode__().split("/")[-1]
class S3UriS3(S3Uri):
type = "s3"
_re = re.compile("^s3://([^/]+)/?(.*)", re.IGNORECASE)
def __init__(self, string):
match = self._re.match(string)
if not match:
raise ValueError("%s: not a S3 URI" % string)
groups = match.groups()
self._bucket = groups[0]
self._object = unicodise(groups[1])
def bucket(self):
return self._bucket
def object(self):
return self._object
def has_bucket(self):
return bool(self._bucket)
def has_object(self):
return bool(self._object)
def uri(self):
return "/".join(["s3:/", self._bucket, self._object])
def is_dns_compatible(self):
return check_bucket_name_dns_conformity(self._bucket)
def public_url(self):
if self.is_dns_compatible():
return "http://%s.%s/%s" % (self._bucket, Config.Config().host_base, self._object)
else:
return "http://%s/%s/%s" % (self._bucket, Config.Config().host_base, self._object)
def host_name(self):
if self.is_dns_compatible():
return "%s.s3.amazonaws.com" % (self._bucket)
else:
return "s3.amazonaws.com"
@staticmethod
def compose_uri(bucket, object = ""):
return "s3://%s/%s" % (bucket, object)
@staticmethod
def httpurl_to_s3uri(http_url):
m=re.match("(https?://)?([^/]+)/?(.*)", http_url, re.IGNORECASE)
hostname, object = m.groups()[1:]
hostname = hostname.lower()
if hostname == "s3.amazonaws.com":
## old-style url: http://s3.amazonaws.com/bucket/object
if object.count("/") == 0:
## no object given
bucket = object
object = ""
else:
## bucket/object
bucket, object = object.split("/", 1)
elif hostname.endswith(".s3.amazonaws.com"):
## new-style url: http://bucket.s3.amazonaws.com/object
bucket = hostname[:-(len(".s3.amazonaws.com"))]
else:
raise ValueError("Unable to parse URL: %s" % http_url)
return S3Uri("s3://%(bucket)s/%(object)s" % {
'bucket' : bucket,
'object' : object })
class S3UriS3FS(S3Uri):
type = "s3fs"
_re = re.compile("^s3fs://([^/]*)/?(.*)", re.IGNORECASE)
def __init__(self, string):
match = self._re.match(string)
if not match:
raise ValueError("%s: not a S3fs URI" % string)
groups = match.groups()
self._fsname = groups[0]
self._path = unicodise(groups[1]).split("/")
def fsname(self):
return self._fsname
def path(self):
return "/".join(self._path)
def uri(self):
return "/".join(["s3fs:/", self._fsname, self.path()])
class S3UriFile(S3Uri):
type = "file"
_re = re.compile("^(\w+://)?(.*)")
def __init__(self, string):
match = self._re.match(string)
groups = match.groups()
if groups[0] not in (None, "file://"):
raise ValueError("%s: not a file:// URI" % string)
self._path = unicodise(groups[1]).split("/")
def path(self):
return "/".join(self._path)
def uri(self):
return "/".join(["file:/", self.path()])
def isdir(self):
return os.path.isdir(self.path())
def dirname(self):
return os.path.dirname(self.path())
class S3UriCloudFront(S3Uri):
type = "cf"
_re = re.compile("^cf://([^/]*)/*(.*)", re.IGNORECASE)
def __init__(self, string):
match = self._re.match(string)
if not match:
raise ValueError("%s: not a CloudFront URI" % string)
groups = match.groups()
self._dist_id = groups[0]
self._request_id = groups[1] != "/" and groups[1] or None
def dist_id(self):
return self._dist_id
def request_id(self):
return self._request_id
def uri(self):
uri = "cf://" + self.dist_id()
if self.request_id():
uri += "/" + self.request_id()
return uri
if __name__ == "__main__":
uri = S3Uri("s3://bucket/object")
print "type() =", type(uri)
print "uri =", uri
print "uri.type=", uri.type
print "bucket =", uri.bucket()
print "object =", uri.object()
print
uri = S3Uri("s3://bucket")
print "type() =", type(uri)
print "uri =", uri
print "uri.type=", uri.type
print "bucket =", uri.bucket()
print
uri = S3Uri("s3fs://filesystem1/path/to/remote/file.txt")
print "type() =", type(uri)
print "uri =", uri
print "uri.type=", uri.type
print "path =", uri.path()
print
uri = S3Uri("/path/to/local/file.txt")
print "type() =", type(uri)
print "uri =", uri
print "uri.type=", uri.type
print "path =", uri.path()
print
uri = S3Uri("cf://1234567890ABCD/")
print "type() =", type(uri)
print "uri =", uri
print "uri.type=", uri.type
print "dist_id =", uri.dist_id()
print
# vim:et:ts=4:sts=4:ai
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