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# -*- coding: utf-8 -*-
# Minio Python Library for Amazon S3 Compatible Cloud Storage, (C)
# 2015, 2016 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.
"""
import base64
import json
import datetime
from .helpers import (is_non_empty_string, is_valid_bucket_name)
from .error import InvalidArgumentError
# 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)
self.policies.append(('eq', '$key', key))
self.form_data['key'] = key
self.key = key
def set_key_startswith(self, key_startswith):
"""
Set key startswith policy condition.
:param key_startswith: set key prefix name.
"""
is_non_empty_string(key_startswith)
self.policies.append(('starts-with', '$key', key_startswith))
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)
self.policies.append(('eq', '$bucket', bucket_name))
self.form_data['bucket'] = bucket_name
self.bucket_name = bucket_name
def set_content_type(self, content_type):
"""
Set content-type policy condition.
:param content_type: set content type name.
"""
self.policies.append(('eq', '$Content-Type', content_type))
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.
"""
err_msg = ('Min-length ({}) must be <= Max-length ({}), '
'and they must be non-negative.').format(
min_length, max_length
)
if min_length > max_length or min_length < 0 or max_length < 0:
raise ValueError(err_msg)
self._content_length_range = (min_length, max_length)
def _marshal_json(self):
"""
Marshal various policies into json str/bytes.
"""
policies = self.policies
if self._content_length_range:
policies.append(['content-length-range'] +
list(self._content_length_range))
policy_stmt = {
"expiration": self._expiration.strftime(
"%Y-%m-%dT%H:%M:%S.000Z"),
}
if len(policies) > 0:
policy_stmt["conditions"] = policies
return json.dumps(policy_stmt)
def base64(self):
"""
Encode json into base64.
"""
s = self._marshal_json()
s_bytes = s if isinstance(s, bytes) else s.encode('utf-8')
b64enc = base64.b64encode(s_bytes)
return b64enc.decode('utf-8') if isinstance(b64enc, bytes) else b64enc
def is_valid(self):
"""
Validate for required parameters.
"""
if not isinstance(self._expiration, datetime.datetime):
raise InvalidArgumentError('Expiration datetime must be specified.')
if 'key' not in self.form_data:
raise InvalidArgumentError('object key must be specified.')
if 'bucket' not in self.form_data:
raise InvalidArgumentError('bucket name must be specified.')