/usr/share/pyshared/boto/s3/key.py is in python-boto 2.2.2-0ubuntu2.
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# Copyright (c) 2011, Nexenta Systems Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
import mimetypes
import os
import re
import rfc822
import StringIO
import base64
import math
import urllib
import boto.utils
from boto.exception import BotoClientError
from boto.provider import Provider
from boto.s3.user import User
from boto import UserAgent
from boto.utils import compute_md5
try:
from hashlib import md5
except ImportError:
from md5 import md5
class Key(object):
DefaultContentType = 'application/octet-stream'
BufferSize = 8192
def __init__(self, bucket=None, name=None):
self.bucket = bucket
self.name = name
self.metadata = {}
self.cache_control = None
self.content_type = self.DefaultContentType
self.content_encoding = None
self.filename = None
self.etag = None
self.is_latest = False
self.last_modified = None
self.owner = None
self.storage_class = 'STANDARD'
self.md5 = None
self.base64md5 = None
self.path = None
self.resp = None
self.mode = None
self.size = None
self.version_id = None
self.source_version_id = None
self.delete_marker = False
self.encrypted = None
def __repr__(self):
if self.bucket:
return '<Key: %s,%s>' % (self.bucket.name, self.name)
else:
return '<Key: None,%s>' % self.name
def __getattr__(self, name):
if name == 'key':
return self.name
else:
raise AttributeError
def __setattr__(self, name, value):
if name == 'key':
self.__dict__['name'] = value
else:
self.__dict__[name] = value
def __iter__(self):
return self
@property
def provider(self):
provider = None
if self.bucket:
if self.bucket.connection:
provider = self.bucket.connection.provider
return provider
def get_md5_from_hexdigest(self, md5_hexdigest):
"""
A utility function to create the 2-tuple (md5hexdigest, base64md5)
from just having a precalculated md5_hexdigest.
"""
import binascii
digest = binascii.unhexlify(md5_hexdigest)
base64md5 = base64.encodestring(digest)
if base64md5[-1] == '\n':
base64md5 = base64md5[0:-1]
return (md5_hexdigest, base64md5)
def handle_encryption_headers(self, resp):
provider = self.bucket.connection.provider
if provider.server_side_encryption_header:
self.encrypted = resp.getheader(provider.server_side_encryption_header, None)
else:
self.encrypted = None
def handle_version_headers(self, resp, force=False):
provider = self.bucket.connection.provider
# If the Key object already has a version_id attribute value, it
# means that it represents an explicit version and the user is
# doing a get_contents_*(version_id=<foo>) to retrieve another
# version of the Key. In that case, we don't really want to
# overwrite the version_id in this Key object. Comprende?
if self.version_id is None or force:
self.version_id = resp.getheader(provider.version_id, None)
self.source_version_id = resp.getheader(provider.copy_source_version_id,
None)
if resp.getheader(provider.delete_marker, 'false') == 'true':
self.delete_marker = True
else:
self.delete_marker = False
def open_read(self, headers=None, query_args='',
override_num_retries=None, response_headers=None):
"""
Open this key for reading
:type headers: dict
:param headers: Headers to pass in the web request
:type query_args: string
:param query_args: Arguments to pass in the query string (ie, 'torrent')
:type override_num_retries: int
:param override_num_retries: If not None will override configured
num_retries parameter for underlying GET.
:type response_headers: dict
:param response_headers: A dictionary containing HTTP headers/values
that will override any headers associated with
the stored object in the response.
See http://goo.gl/EWOPb for details.
"""
if self.resp == None:
self.mode = 'r'
provider = self.bucket.connection.provider
self.resp = self.bucket.connection.make_request(
'GET', self.bucket.name, self.name, headers,
query_args=query_args,
override_num_retries=override_num_retries)
if self.resp.status < 199 or self.resp.status > 299:
body = self.resp.read()
raise provider.storage_response_error(self.resp.status,
self.resp.reason, body)
response_headers = self.resp.msg
self.metadata = boto.utils.get_aws_metadata(response_headers,
provider)
for name,value in response_headers.items():
# To get correct size for Range GETs, use Content-Range
# header if one was returned. If not, use Content-Length
# header.
if (name.lower() == 'content-length' and
'Content-Range' not in response_headers):
self.size = int(value)
elif name.lower() == 'content-range':
end_range = re.sub('.*/(.*)', '\\1', value)
self.size = int(end_range)
elif name.lower() == 'etag':
self.etag = value
elif name.lower() == 'content-type':
self.content_type = value
elif name.lower() == 'content-encoding':
self.content_encoding = value
elif name.lower() == 'last-modified':
self.last_modified = value
elif name.lower() == 'cache-control':
self.cache_control = value
self.handle_version_headers(self.resp)
self.handle_encryption_headers(self.resp)
def open_write(self, headers=None, override_num_retries=None):
"""
Open this key for writing.
Not yet implemented
:type headers: dict
:param headers: Headers to pass in the write request
:type override_num_retries: int
:param override_num_retries: If not None will override configured
num_retries parameter for underlying PUT.
"""
raise BotoClientError('Not Implemented')
def open(self, mode='r', headers=None, query_args=None,
override_num_retries=None):
if mode == 'r':
self.mode = 'r'
self.open_read(headers=headers, query_args=query_args,
override_num_retries=override_num_retries)
elif mode == 'w':
self.mode = 'w'
self.open_write(headers=headers,
override_num_retries=override_num_retries)
else:
raise BotoClientError('Invalid mode: %s' % mode)
closed = False
def close(self):
if self.resp:
self.resp.read()
self.resp = None
self.mode = None
self.closed = True
def next(self):
"""
By providing a next method, the key object supports use as an iterator.
For example, you can now say:
for bytes in key:
write bytes to a file or whatever
All of the HTTP connection stuff is handled for you.
"""
self.open_read()
data = self.resp.read(self.BufferSize)
if not data:
self.close()
raise StopIteration
return data
def read(self, size=0):
self.open_read()
if size == 0:
data = self.resp.read()
else:
data = self.resp.read(size)
if not data:
self.close()
return data
def change_storage_class(self, new_storage_class, dst_bucket=None):
"""
Change the storage class of an existing key.
Depending on whether a different destination bucket is supplied
or not, this will either move the item within the bucket, preserving
all metadata and ACL info bucket changing the storage class or it
will copy the item to the provided destination bucket, also
preserving metadata and ACL info.
:type new_storage_class: string
:param new_storage_class: The new storage class for the Key.
Possible values are:
* STANDARD
* REDUCED_REDUNDANCY
:type dst_bucket: string
:param dst_bucket: The name of a destination bucket. If not
provided the current bucket of the key
will be used.
"""
if new_storage_class == 'STANDARD':
return self.copy(self.bucket.name, self.name,
reduced_redundancy=False, preserve_acl=True)
elif new_storage_class == 'REDUCED_REDUNDANCY':
return self.copy(self.bucket.name, self.name,
reduced_redundancy=True, preserve_acl=True)
else:
raise BotoClientError('Invalid storage class: %s' %
new_storage_class)
def copy(self, dst_bucket, dst_key, metadata=None,
reduced_redundancy=False, preserve_acl=False,
encrypt_key=False):
"""
Copy this Key to another bucket.
:type dst_bucket: string
:param dst_bucket: The name of the destination bucket
:type dst_key: string
:param dst_key: The name of the destination key
:type metadata: dict
:param metadata: Metadata to be associated with new key.
If metadata is supplied, it will replace the
metadata of the source key being copied.
If no metadata is supplied, the source key's
metadata will be copied to the new key.
:type reduced_redundancy: bool
:param reduced_redundancy: If True, this will force the storage
class of the new Key to be
REDUCED_REDUNDANCY regardless of the
storage class of the key being copied.
The Reduced Redundancy Storage (RRS)
feature of S3, provides lower
redundancy at lower storage cost.
:type preserve_acl: bool
:param preserve_acl: If True, the ACL from the source key
will be copied to the destination
key. If False, the destination key
will have the default ACL.
Note that preserving the ACL in the
new key object will require two
additional API calls to S3, one to
retrieve the current ACL and one to
set that ACL on the new object. If
you don't care about the ACL, a value
of False will be significantly more
efficient.
:type encrypt_key: bool
:param encrypt_key: If True, the new copy of the object will
be encrypted on the server-side by S3 and
will be stored in an encrypted form while
at rest in S3.
:rtype: :class:`boto.s3.key.Key` or subclass
:returns: An instance of the newly created key object
"""
dst_bucket = self.bucket.connection.lookup(dst_bucket)
if reduced_redundancy:
storage_class = 'REDUCED_REDUNDANCY'
else:
storage_class = self.storage_class
return dst_bucket.copy_key(dst_key, self.bucket.name,
self.name, metadata,
storage_class=storage_class,
preserve_acl=preserve_acl,
encrypt_key=encrypt_key)
def startElement(self, name, attrs, connection):
if name == 'Owner':
self.owner = User(self)
return self.owner
else:
return None
def endElement(self, name, value, connection):
if name == 'Key':
self.name = value
elif name == 'ETag':
self.etag = value
elif name == 'IsLatest':
if value == 'true':
self.is_latest = True
else:
self.is_latest = False
elif name == 'LastModified':
self.last_modified = value
elif name == 'Size':
self.size = int(value)
elif name == 'StorageClass':
self.storage_class = value
elif name == 'Owner':
pass
elif name == 'VersionId':
self.version_id = value
else:
setattr(self, name, value)
def exists(self):
"""
Returns True if the key exists
:rtype: bool
:return: Whether the key exists on S3
"""
return bool(self.bucket.lookup(self.name))
def delete(self):
"""
Delete this key from S3
"""
return self.bucket.delete_key(self.name, version_id=self.version_id)
def get_metadata(self, name):
return self.metadata.get(name)
def set_metadata(self, name, value):
self.metadata[name] = value
def update_metadata(self, d):
self.metadata.update(d)
# convenience methods for setting/getting ACL
def set_acl(self, acl_str, headers=None):
if self.bucket != None:
self.bucket.set_acl(acl_str, self.name, headers=headers)
def get_acl(self, headers=None):
if self.bucket != None:
return self.bucket.get_acl(self.name, headers=headers)
def get_xml_acl(self, headers=None):
if self.bucket != None:
return self.bucket.get_xml_acl(self.name, headers=headers)
def set_xml_acl(self, acl_str, headers=None):
if self.bucket != None:
return self.bucket.set_xml_acl(acl_str, self.name, headers=headers)
def set_canned_acl(self, acl_str, headers=None):
return self.bucket.set_canned_acl(acl_str, self.name, headers)
def make_public(self, headers=None):
return self.bucket.set_canned_acl('public-read', self.name, headers)
def generate_url(self, expires_in, method='GET', headers=None,
query_auth=True, force_http=False, response_headers=None,
expires_in_absolute=False):
"""
Generate a URL to access this key.
:type expires_in: int
:param expires_in: How long the url is valid for, in seconds
:type method: string
:param method: The method to use for retrieving the file
(default is GET)
:type headers: dict
:param headers: Any headers to pass along in the request
:type query_auth: bool
:param query_auth:
:rtype: string
:return: The URL to access the key
"""
return self.bucket.connection.generate_url(expires_in, method,
self.bucket.name, self.name,
headers, query_auth,
force_http,
response_headers,
expires_in_absolute)
def send_file(self, fp, headers=None, cb=None, num_cb=10,
query_args=None, chunked_transfer=False, size=None):
"""
Upload a file to a key into a bucket on S3.
:type fp: file
:param fp: The file pointer to upload. The file pointer must point
point at the offset from which you wish to upload.
ie. if uploading the full file, it should point at the
start of the file. Normally when a file is opened for
reading, the fp will point at the first byte. See the
bytes parameter below for more info.
:type headers: dict
:param headers: The headers to pass along with the PUT request
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type num_cb: int
:param num_cb: (optional) If a callback is specified with the cb
parameter this parameter determines the granularity
of the callback by defining the maximum number of
times the callback will be called during the file
transfer. Providing a negative integer will cause
your callback to be called with each buffer read.
:type size: int
:param size: (optional) The Maximum number of bytes to read from
the file pointer (fp). This is useful when uploading
a file in multiple parts where you are splitting the
file up into different ranges to be uploaded. If not
specified, the default behaviour is to read all bytes
from the file pointer. Less bytes may be available.
"""
provider = self.bucket.connection.provider
try:
spos = fp.tell()
except IOError:
spos = None
self.read_from_stream = False
def sender(http_conn, method, path, data, headers):
# This function is called repeatedly for temporary retries
# so we must be sure the file pointer is pointing at the
# start of the data.
if spos is not None and spos != fp.tell():
fp.seek(spos)
elif spos is None and self.read_from_stream:
# if seek is not supported, and we've read from this
# stream already, then we need to abort retries to
# avoid setting bad data.
raise provider.storage_data_error(
'Cannot retry failed request. fp does not support seeking.')
http_conn.putrequest(method, path)
for key in headers:
http_conn.putheader(key, headers[key])
http_conn.endheaders()
if chunked_transfer and not self.base64md5:
# MD5 for the stream has to be calculated on the fly.
m = md5()
else:
m = None
save_debug = self.bucket.connection.debug
self.bucket.connection.debug = 0
# If the debuglevel < 3 we don't want to show connection
# payload, so turn off HTTP connection-level debug output (to
# be restored below).
# Use the getattr approach to allow this to work in AppEngine.
if getattr(http_conn, 'debuglevel', 0) < 3:
http_conn.set_debuglevel(0)
data_len = 0
if cb:
if size:
cb_size = size
elif self.size:
cb_size = self.size
else:
cb_size = 0
if chunked_transfer and cb_size == 0:
# For chunked Transfer, we call the cb for every 1MB
# of data transferred, except when we know size.
cb_count = (1024 * 1024)/self.BufferSize
elif num_cb > 1:
cb_count = int(math.ceil(cb_size/self.BufferSize/(num_cb-1.0)))
elif num_cb < 0:
cb_count = -1
else:
cb_count = 0
i = 0
cb(data_len, cb_size)
bytes_togo = size
if bytes_togo and bytes_togo < self.BufferSize:
chunk = fp.read(bytes_togo)
else:
chunk = fp.read(self.BufferSize)
if spos is None:
# read at least something from a non-seekable fp.
self.read_from_stream = True
while chunk:
chunk_len = len(chunk)
data_len += chunk_len
if chunked_transfer:
http_conn.send('%x;\r\n' % chunk_len)
http_conn.send(chunk)
http_conn.send('\r\n')
else:
http_conn.send(chunk)
if m:
m.update(chunk)
if bytes_togo:
bytes_togo -= chunk_len
if bytes_togo <= 0:
break
if cb:
i += 1
if i == cb_count or cb_count == -1:
cb(data_len, cb_size)
i = 0
if bytes_togo and bytes_togo < self.BufferSize:
chunk = fp.read(bytes_togo)
else:
chunk = fp.read(self.BufferSize)
self.size = data_len
if chunked_transfer:
http_conn.send('0\r\n')
if m:
# Use the chunked trailer for the digest
hd = m.hexdigest()
self.md5, self.base64md5 = self.get_md5_from_hexdigest(hd)
# http_conn.send("Content-MD5: %s\r\n" % self.base64md5)
http_conn.send('\r\n')
if cb and (cb_count <= 1 or i > 0) and data_len > 0:
cb(data_len, cb_size)
response = http_conn.getresponse()
body = response.read()
http_conn.set_debuglevel(save_debug)
self.bucket.connection.debug = save_debug
if ((response.status == 500 or response.status == 503 or
response.getheader('location')) and not chunked_transfer):
# we'll try again.
return response
elif response.status >= 200 and response.status <= 299:
self.etag = response.getheader('etag')
if self.etag != '"%s"' % self.md5:
raise provider.storage_data_error(
'ETag from S3 did not match computed MD5')
return response
else:
raise provider.storage_response_error(
response.status, response.reason, body)
if not headers:
headers = {}
else:
headers = headers.copy()
headers['User-Agent'] = UserAgent
if self.storage_class != 'STANDARD':
headers[provider.storage_class_header] = self.storage_class
if headers.has_key('Content-Encoding'):
self.content_encoding = headers['Content-Encoding']
if headers.has_key('Content-Type'):
# Some use cases need to suppress sending of the Content-Type
# header and depend on the receiving server to set the content
# type. This can be achieved by setting headers['Content-Type']
# to None when calling this method.
if headers['Content-Type']:
self.content_type = headers['Content-Type']
else:
# Delete null Content-Type value to skip sending that header.
del headers['Content-Type']
elif self.path:
self.content_type = mimetypes.guess_type(self.path)[0]
if self.content_type == None:
self.content_type = self.DefaultContentType
headers['Content-Type'] = self.content_type
else:
headers['Content-Type'] = self.content_type
if self.base64md5:
headers['Content-MD5'] = self.base64md5
if chunked_transfer:
headers['Transfer-Encoding'] = 'chunked'
#if not self.base64md5:
# headers['Trailer'] = "Content-MD5"
else:
headers['Content-Length'] = str(self.size)
headers['Expect'] = '100-Continue'
headers = boto.utils.merge_meta(headers, self.metadata, provider)
resp = self.bucket.connection.make_request('PUT', self.bucket.name,
self.name, headers,
sender=sender,
query_args=query_args)
self.handle_version_headers(resp, force=True)
def compute_md5(self, fp, size=None):
"""
:type fp: file
:param fp: File pointer to the file to MD5 hash. The file pointer
will be reset to the same position before the
method returns.
:type size: int
:param size: (optional) The Maximum number of bytes to read from
the file pointer (fp). This is useful when uploading
a file in multiple parts where the file is being
split inplace into different parts. Less bytes may
be available.
:rtype: tuple
:return: A tuple containing the hex digest version of the MD5 hash
as the first element and the base64 encoded version of the
plain digest as the second element.
"""
tup = compute_md5(fp, size=size)
# Returned values are MD5 hash, base64 encoded MD5 hash, and data size.
# The internal implementation of compute_md5() needs to return the
# data size but we don't want to return that value to the external
# caller because it changes the class interface (i.e. it might
# break some code) so we consume the third tuple value here and
# return the remainder of the tuple to the caller, thereby preserving
# the existing interface.
self.size = tup[2]
return tup[0:2]
def set_contents_from_stream(self, fp, headers=None, replace=True,
cb=None, num_cb=10, policy=None,
reduced_redundancy=False, query_args=None,
size=None):
"""
Store an object using the name of the Key object as the key in
cloud and the contents of the data stream pointed to by 'fp' as
the contents.
The stream object is not seekable and total size is not known.
This has the implication that we can't specify the Content-Size and
Content-MD5 in the header. So for huge uploads, the delay in calculating
MD5 is avoided but with a penalty of inability to verify the integrity
of the uploaded data.
:type fp: file
:param fp: the file whose contents are to be uploaded
:type headers: dict
:param headers: additional HTTP headers to be sent with the PUT request.
:type replace: bool
:param replace: If this parameter is False, the method will first check
to see if an object exists in the bucket with the same key. If it
does, it won't overwrite it. The default value is True which will
overwrite the object.
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept two integer
parameters, the first representing the number of bytes that have
been successfully transmitted to GS and the second representing the
total number of bytes that need to be transmitted.
:type num_cb: int
:param num_cb: (optional) If a callback is specified with the cb
parameter, this parameter determines the granularity of the callback
by defining the maximum number of times the callback will be called
during the file transfer.
:type policy: :class:`boto.gs.acl.CannedACLStrings`
:param policy: A canned ACL policy that will be applied to the new key
in GS.
:type reduced_redundancy: bool
:param reduced_redundancy: If True, this will set the storage
class of the new Key to be
REDUCED_REDUNDANCY. The Reduced Redundancy
Storage (RRS) feature of S3, provides lower
redundancy at lower storage cost.
:type size: int
:param size: (optional) The Maximum number of bytes to read from
the file pointer (fp). This is useful when uploading
a file in multiple parts where you are splitting the
file up into different ranges to be uploaded. If not
specified, the default behaviour is to read all bytes
from the file pointer. Less bytes may be available.
"""
provider = self.bucket.connection.provider
if not provider.supports_chunked_transfer():
raise BotoClientError('%s does not support chunked transfer'
% provider.get_provider_name())
# Name of the Object should be specified explicitly for Streams.
if not self.name or self.name == '':
raise BotoClientError('Cannot determine the destination '
'object name for the given stream')
if headers is None:
headers = {}
if policy:
headers[provider.acl_header] = policy
if reduced_redundancy:
self.storage_class = 'REDUCED_REDUNDANCY'
if provider.storage_class_header:
headers[provider.storage_class_header] = self.storage_class
if self.bucket != None:
if not replace:
if self.bucket.lookup(self.name):
return
self.send_file(fp, headers, cb, num_cb, query_args,
chunked_transfer=True, size=size)
def set_contents_from_file(self, fp, headers=None, replace=True,
cb=None, num_cb=10, policy=None, md5=None,
reduced_redundancy=False, query_args=None,
encrypt_key=False, size=None):
"""
Store an object in S3 using the name of the Key object as the
key in S3 and the contents of the file pointed to by 'fp' as the
contents.
:type fp: file
:param fp: the file whose contents to upload
:type headers: dict
:param headers: Additional HTTP headers that will be sent with
the PUT request.
:type replace: bool
:param replace: If this parameter is False, the method
will first check to see if an object exists in the
bucket with the same key. If it does, it won't
overwrite it. The default value is True which will
overwrite the object.
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with the cb
parameter this parameter determines the granularity
of the callback by defining the maximum number of
times the callback will be called during the
file transfer.
:type policy: :class:`boto.s3.acl.CannedACLStrings`
:param policy: A canned ACL policy that will be applied to the
new key in S3.
:type md5: A tuple containing the hexdigest version of the MD5
checksum of the file as the first element and the
Base64-encoded version of the plain checksum as the
second element. This is the same format returned by
the compute_md5 method.
:param md5: If you need to compute the MD5 for any reason prior
to upload, it's silly to have to do it twice so this
param, if present, will be used as the MD5 values of
the file. Otherwise, the checksum will be computed.
:type reduced_redundancy: bool
:param reduced_redundancy: If True, this will set the storage
class of the new Key to be
REDUCED_REDUNDANCY. The Reduced Redundancy
Storage (RRS) feature of S3, provides lower
redundancy at lower storage cost.
:type encrypt_key: bool
:param encrypt_key: If True, the new copy of the object will
be encrypted on the server-side by S3 and
will be stored in an encrypted form while
at rest in S3.
:type size: int
:param size: (optional) The Maximum number of bytes to read from
the file pointer (fp). This is useful when uploading
a file in multiple parts where you are splitting the
file up into different ranges to be uploaded. If not
specified, the default behaviour is to read all bytes
from the file pointer. Less bytes may be available.
"""
provider = self.bucket.connection.provider
headers = headers or {}
if policy:
headers[provider.acl_header] = policy
if encrypt_key:
headers[provider.server_side_encryption_header] = 'AES256'
if reduced_redundancy:
self.storage_class = 'REDUCED_REDUNDANCY'
if provider.storage_class_header:
headers[provider.storage_class_header] = self.storage_class
# TODO - What if provider doesn't support reduced reduncancy?
# What if different providers provide different classes?
if hasattr(fp, 'name'):
self.path = fp.name
if self.bucket != None:
if not md5 and provider.supports_chunked_transfer():
# defer md5 calculation to on the fly and
# we don't know anything about size yet.
chunked_transfer = True
self.size = None
else:
chunked_transfer = False
if not md5:
# compute_md5() and also set self.size to actual
# size of the bytes read computing the md5.
md5 = self.compute_md5(fp, size)
# adjust size if required
size = self.size
elif size:
self.size = size
else:
# If md5 is provided, still need to size so
# calculate based on bytes to end of content
spos = fp.tell()
fp.seek(0, os.SEEK_END)
self.size = fp.tell() - spos
fp.seek(spos)
size = self.size
self.md5 = md5[0]
self.base64md5 = md5[1]
if self.name == None:
self.name = self.md5
if not replace:
if self.bucket.lookup(self.name):
return
self.send_file(fp, headers=headers, cb=cb, num_cb=num_cb,
query_args=query_args, chunked_transfer=chunked_transfer,
size=size)
def set_contents_from_filename(self, filename, headers=None, replace=True,
cb=None, num_cb=10, policy=None, md5=None,
reduced_redundancy=False,
encrypt_key=False):
"""
Store an object in S3 using the name of the Key object as the
key in S3 and the contents of the file named by 'filename'.
See set_contents_from_file method for details about the
parameters.
:type filename: string
:param filename: The name of the file that you want to put onto S3
:type headers: dict
:param headers: Additional headers to pass along with the
request to AWS.
:type replace: bool
:param replace: If True, replaces the contents of the file
if it already exists.
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
:type policy: :class:`boto.s3.acl.CannedACLStrings`
:param policy: A canned ACL policy that will be applied to the
new key in S3.
:type md5: A tuple containing the hexdigest version of the MD5
checksum of the file as the first element and the
Base64-encoded version of the plain checksum as the
second element. This is the same format returned by
the compute_md5 method.
:param md5: If you need to compute the MD5 for any reason prior
to upload, it's silly to have to do it twice so this
param, if present, will be used as the MD5 values
of the file. Otherwise, the checksum will be computed.
:type reduced_redundancy: bool
:param reduced_redundancy: If True, this will set the storage
class of the new Key to be
REDUCED_REDUNDANCY. The Reduced Redundancy
Storage (RRS) feature of S3, provides lower
redundancy at lower storage cost.
:type encrypt_key: bool
:param encrypt_key: If True, the new copy of the object will
be encrypted on the server-side by S3 and
will be stored in an encrypted form while
at rest in S3.
"""
fp = open(filename, 'rb')
self.set_contents_from_file(fp, headers, replace, cb, num_cb,
policy, md5, reduced_redundancy,
encrypt_key=encrypt_key)
fp.close()
def set_contents_from_string(self, s, headers=None, replace=True,
cb=None, num_cb=10, policy=None, md5=None,
reduced_redundancy=False,
encrypt_key=False):
"""
Store an object in S3 using the name of the Key object as the
key in S3 and the string 's' as the contents.
See set_contents_from_file method for details about the
parameters.
:type headers: dict
:param headers: Additional headers to pass along with the
request to AWS.
:type replace: bool
:param replace: If True, replaces the contents of the file if
it already exists.
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
:type policy: :class:`boto.s3.acl.CannedACLStrings`
:param policy: A canned ACL policy that will be applied to the
new key in S3.
:type md5: A tuple containing the hexdigest version of the MD5
checksum of the file as the first element and the
Base64-encoded version of the plain checksum as the
second element. This is the same format returned by
the compute_md5 method.
:param md5: If you need to compute the MD5 for any reason prior
to upload, it's silly to have to do it twice so this
param, if present, will be used as the MD5 values
of the file. Otherwise, the checksum will be computed.
:type reduced_redundancy: bool
:param reduced_redundancy: If True, this will set the storage
class of the new Key to be
REDUCED_REDUNDANCY. The Reduced Redundancy
Storage (RRS) feature of S3, provides lower
redundancy at lower storage cost.
:type encrypt_key: bool
:param encrypt_key: If True, the new copy of the object will
be encrypted on the server-side by S3 and
will be stored in an encrypted form while
at rest in S3.
"""
if isinstance(s, unicode):
s = s.encode("utf-8")
fp = StringIO.StringIO(s)
r = self.set_contents_from_file(fp, headers, replace, cb, num_cb,
policy, md5, reduced_redundancy,
encrypt_key=encrypt_key)
fp.close()
return r
def get_file(self, fp, headers=None, cb=None, num_cb=10,
torrent=False, version_id=None, override_num_retries=None,
response_headers=None):
"""
Retrieves a file from an S3 Key
:type fp: file
:param fp: File pointer to put the data into
:type headers: string
:param: headers to send when retrieving the files
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
:type torrent: bool
:param torrent: Flag for whether to get a torrent for the file
:type override_num_retries: int
:param override_num_retries: If not None will override configured
num_retries parameter for underlying GET.
:type response_headers: dict
:param response_headers: A dictionary containing HTTP headers/values
that will override any headers associated with
the stored object in the response.
See http://goo.gl/EWOPb for details.
"""
save_debug = self.bucket.connection.debug
if self.bucket.connection.debug == 1:
self.bucket.connection.debug = 0
query_args = []
if torrent:
query_args.append('torrent')
m = None
else:
m = md5()
# If a version_id is passed in, use that. If not, check to see
# if the Key object has an explicit version_id and, if so, use that.
# Otherwise, don't pass a version_id query param.
if version_id is None:
version_id = self.version_id
if version_id:
query_args.append('versionId=%s' % version_id)
if response_headers:
for key in response_headers:
query_args.append('%s=%s' % (key, urllib.quote(response_headers[key])))
query_args = '&'.join(query_args)
self.open('r', headers, query_args=query_args,
override_num_retries=override_num_retries)
data_len = 0
if cb:
if self.size is None:
cb_size = 0
else:
cb_size = self.size
if self.size is None and num_cb != -1:
# If size is not available due to chunked transfer for example,
# we'll call the cb for every 1MB of data transferred.
cb_count = (1024 * 1024)/self.BufferSize
elif num_cb > 1:
cb_count = int(math.ceil(cb_size/self.BufferSize/(num_cb-1.0)))
elif num_cb < 0:
cb_count = -1
else:
cb_count = 0
i = 0
cb(data_len, cb_size)
for bytes in self:
fp.write(bytes)
data_len += len(bytes)
if m:
m.update(bytes)
if cb:
if cb_size > 0 and data_len >= cb_size:
break
i += 1
if i == cb_count or cb_count == -1:
cb(data_len, cb_size)
i = 0
if cb and (cb_count <= 1 or i > 0) and data_len > 0:
cb(data_len, cb_size)
if m:
self.md5 = m.hexdigest()
if self.size is None and not torrent and not headers.has_key("Range"):
self.size = data_len
self.close()
self.bucket.connection.debug = save_debug
def get_torrent_file(self, fp, headers=None, cb=None, num_cb=10):
"""
Get a torrent file (see to get_file)
:type fp: file
:param fp: The file pointer of where to put the torrent
:type headers: dict
:param headers: Headers to be passed
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
"""
return self.get_file(fp, headers, cb, num_cb, torrent=True)
def get_contents_to_file(self, fp, headers=None,
cb=None, num_cb=10,
torrent=False,
version_id=None,
res_download_handler=None,
response_headers=None):
"""
Retrieve an object from S3 using the name of the Key object as the
key in S3. Write the contents of the object to the file pointed
to by 'fp'.
:type fp: File -like object
:param fp:
:type headers: dict
:param headers: additional HTTP headers that will be sent with
the GET request.
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
:type torrent: bool
:param torrent: If True, returns the contents of a torrent
file as a string.
:type res_upload_handler: ResumableDownloadHandler
:param res_download_handler: If provided, this handler will
perform the download.
:type response_headers: dict
:param response_headers: A dictionary containing HTTP headers/values
that will override any headers associated with
the stored object in the response.
See http://goo.gl/EWOPb for details.
"""
if self.bucket != None:
if res_download_handler:
res_download_handler.get_file(self, fp, headers, cb, num_cb,
torrent=torrent,
version_id=version_id)
else:
self.get_file(fp, headers, cb, num_cb, torrent=torrent,
version_id=version_id,
response_headers=response_headers)
def get_contents_to_filename(self, filename, headers=None,
cb=None, num_cb=10,
torrent=False,
version_id=None,
res_download_handler=None,
response_headers=None):
"""
Retrieve an object from S3 using the name of the Key object as the
key in S3. Store contents of the object to a file named by 'filename'.
See get_contents_to_file method for details about the
parameters.
:type filename: string
:param filename: The filename of where to put the file contents
:type headers: dict
:param headers: Any additional headers to send in the request
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
:type torrent: bool
:param torrent: If True, returns the contents of a torrent file
as a string.
:type res_upload_handler: ResumableDownloadHandler
:param res_download_handler: If provided, this handler will
perform the download.
:type response_headers: dict
:param response_headers: A dictionary containing HTTP headers/values
that will override any headers associated with
the stored object in the response.
See http://goo.gl/EWOPb for details.
"""
fp = open(filename, 'wb')
self.get_contents_to_file(fp, headers, cb, num_cb, torrent=torrent,
version_id=version_id,
res_download_handler=res_download_handler,
response_headers=response_headers)
fp.close()
# if last_modified date was sent from s3, try to set file's timestamp
if self.last_modified != None:
try:
modified_tuple = rfc822.parsedate_tz(self.last_modified)
modified_stamp = int(rfc822.mktime_tz(modified_tuple))
os.utime(fp.name, (modified_stamp, modified_stamp))
except Exception: pass
def get_contents_as_string(self, headers=None,
cb=None, num_cb=10,
torrent=False,
version_id=None,
response_headers=None):
"""
Retrieve an object from S3 using the name of the Key object as the
key in S3. Return the contents of the object as a string.
See get_contents_to_file method for details about the
parameters.
:type headers: dict
:param headers: Any additional headers to send in the request
:type cb: function
:param cb: a callback function that will be called to report
progress on the upload. The callback should accept
two integer parameters, the first representing the
number of bytes that have been successfully
transmitted to S3 and the second representing the
size of the to be transmitted object.
:type cb: int
:param num_cb: (optional) If a callback is specified with
the cb parameter this parameter determines the
granularity of the callback by defining
the maximum number of times the callback will
be called during the file transfer.
:type torrent: bool
:param torrent: If True, returns the contents of a torrent file
as a string.
:type response_headers: dict
:param response_headers: A dictionary containing HTTP headers/values
that will override any headers associated with
the stored object in the response.
See http://goo.gl/EWOPb for details.
:rtype: string
:returns: The contents of the file as a string
"""
fp = StringIO.StringIO()
self.get_contents_to_file(fp, headers, cb, num_cb, torrent=torrent,
version_id=version_id,
response_headers=response_headers)
return fp.getvalue()
def add_email_grant(self, permission, email_address, headers=None):
"""
Convenience method that provides a quick way to add an email grant
to a key. This method retrieves the current ACL, creates a new
grant based on the parameters passed in, adds that grant to the ACL
and then PUT's the new ACL back to S3.
:type permission: string
:param permission: The permission being granted. Should be one of:
(READ, WRITE, READ_ACP, WRITE_ACP, FULL_CONTROL).
:type email_address: string
:param email_address: The email address associated with the AWS
account your are granting the permission to.
:type recursive: boolean
:param recursive: A boolean value to controls whether the command
will apply the grant to all keys within the bucket
or not. The default value is False. By passing a
True value, the call will iterate through all keys
in the bucket and apply the same grant to each key.
CAUTION: If you have a lot of keys, this could take
a long time!
"""
policy = self.get_acl(headers=headers)
policy.acl.add_email_grant(permission, email_address)
self.set_acl(policy, headers=headers)
def add_user_grant(self, permission, user_id, headers=None,
display_name=None):
"""
Convenience method that provides a quick way to add a canonical
user grant to a key. This method retrieves the current ACL,
creates a new grant based on the parameters passed in, adds that
grant to the ACL and then PUT's the new ACL back to S3.
:type permission: string
:param permission: The permission being granted. Should be one of:
(READ, WRITE, READ_ACP, WRITE_ACP, FULL_CONTROL).
:type user_id: string
:param user_id: The canonical user id associated with the AWS
account your are granting the permission to.
:type display_name: string
:param display_name: An option string containing the user's
Display Name. Only required on Walrus.
"""
policy = self.get_acl()
policy.acl.add_user_grant(permission, user_id,
display_name=display_name)
self.set_acl(policy, headers=headers)
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