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181 lines (148 loc) · 5.49 KB
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# -*- coding: utf-8 -*-
# Minio Python Library for Amazon S3 Compatible Cloud Storage, (C) 2015 Minio, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
minio.post_policy
~~~~~~~~~~~~~~~
This module contains :class:`PostPolicy <PostPolicy>` implementation.
:copyright: (c) 2015 by Minio, Inc.
:license: Apache 2.0, see LICENSE for more details.
"""
from .helpers import (is_non_empty_string, is_valid_bucket_name,
encode_to_base64)
# Policy explanation:
# http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
class PostPolicy(object):
"""
A :class:`PostPolicy <PostPolicy>` object for constructing
Amazon S3 POST policy JSON string.
"""
def __init__(self):
self._expiration = None
self._content_length_range = tuple()
# publicly accessible
self.policies = []
self.form_data = dict()
self.bucket_name = ''
self.key = ''
def set_expires(self, time):
"""
Set expiration time :class:`datetime.datetime`.
:param time: set expiration :class:`datetime.datetime`.
"""
if time.toordinal() < 1:
ValueError()
self._expiration = time
def set_key(self, key):
"""
Set key policy condition.
:param key: set key name.
"""
is_non_empty_string(key)
policy = ('eq', '$key', key)
self.policies.append(policy)
self.form_data['key'] = key
self.key = key
def set_key_startswith(self, key_startswith):
"""
Set key startswith policy condition.
:param key_startswith: set key prefix name.
"""
is_non_empty_string(key_startswith)
policy = ('starts-with', '$key', key_startswith)
self.policies.append(policy)
self.form_data['key'] = key_startswith
def set_bucket_name(self, bucket_name):
"""
Set bucket name policy condition.
:param bucket_name: set bucket name.
"""
is_valid_bucket_name(bucket_name)
policy = ('eq', '$bucket', bucket_name)
self.policies.append(policy)
self.form_data['bucket'] = bucket_name
self.bucket_name = bucket_name
def set_content_type(self, content_type):
"""
Set content-type policy condition.
:param content_type: set content type name.
"""
policy = ('eq', '$Content-Type', content_type)
self.policies.append(policy)
self.form_data['Content-Type'] = content_type
def set_content_length_range(self, min_length, max_length):
"""
Set content length range policy condition.
Raise :exc:`ValueError` for invalid inputs.
:param min_length: Minimum length limit for content size.
:param max_length: Maximum length limit for content size.
"""
if min_length > max_length:
raise ValueError('minimum limit cannot be larger '
'than maximum limit.')
if min_length < 0:
raise ValueError('minimum limit cannot be negative.')
if max_length < 0:
raise ValueError('maximum limit cannot be negative.')
self._content_length_range = (min_length, max_length)
def _marshal_json(self):
"""
Marshal various policies into jsonified byte array.
"""
expiration_str = ('"expiration":"' +
self._expiration.strftime("%Y-%m-%dT%H:%M:%S.000Z") +
'"')
policies = []
for policy in self.policies:
policies.append('["' + policy[0] + '","' +
policy[1] + '","' + policy[2] + '"]')
if len(self._content_length_range) == 2:
policies.append('["content-length-range", ' +
str(self._content_length_range[0]) +
', ' + str(self._content_length_range[1]) + ']')
if len(policies) > 0:
policies_str = '"conditions":[' + ','.join(policies) + ']'
return_str = '{'
if len(expiration_str) > 0:
return_str = return_str + expiration_str + ','
if len(policies_str) > 0:
return_str = return_str + policies_str
return_str = return_str + '}'
return bytearray(return_str.encode('utf-8'))
def base64(self):
"""
Encode json byte array into base64.
"""
return encode_to_base64(self._marshal_json())
def is_expiration_set(self):
"""
If *expiration* set returns True, False otherwise.
"""
if self._expiration is None:
return False
return True
def is_key_set(self):
"""
If *key* set returns True, False otherwise.
"""
if self.form_data['key'] is None:
return False
return True
def is_bucket_set(self):
"""
If *bucket* set returns True, False otherwise.
"""
if self.form_data['bucket'] is None:
return False
return True