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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.parsers
~~~~~~~~~~~~~~~~~~~
This module contains core API parsers.
:copyright: (c) 2015 by MinIO, Inc.
:license: Apache 2.0, see LICENSE for more details.
"""
# standard.
from xml.etree import cElementTree
from xml.etree.cElementTree import ParseError
from datetime import datetime
# dependencies.
import pytz
# minio specific.
from .error import (ETREE_EXCEPTIONS, InvalidXMLError, MultiDeleteError)
from .compat import urldecode
from .definitions import (Object, Bucket, IncompleteUpload,
UploadPart, MultipartUploadResult,
CopyObjectResult)
from .xml_marshal import (NOTIFICATIONS_ARN_FIELDNAME_MAP)
_S3_NS = {'s3' : 'http://s3.amazonaws.com/doc/2006-03-01/'}
class S3Element(object):
"""S3 aware XML parsing class. Wraps a root element name and
cElementTree.Element instance. Provides S3 namespace aware parsing
functions.
"""
def __init__(self, root_name, element):
self.root_name = root_name
self.element = element
@classmethod
def fromstring(cls, root_name, data):
"""Initialize S3Element from name and XML string data.
:param name: Name for XML data. Used in XML errors.
:param data: string data to be parsed.
:return: Returns an S3Element.
"""
try:
return cls(root_name, cElementTree.fromstring(data.strip()))
except ETREE_EXCEPTIONS as error:
raise InvalidXMLError(
'"{}" XML is not parsable. Message: {}'.format(
root_name, error
)
)
def findall(self, name):
"""Similar to ElementTree.Element.findall()
"""
return [
S3Element(self.root_name, elem)
for elem in self.element.findall('s3:{}'.format(name), _S3_NS)
]
def find(self, name):
"""Similar to ElementTree.Element.find()
"""
elt = self.element.find('s3:{}'.format(name), _S3_NS)
return S3Element(self.root_name, elt) if elt is not None else None
def get_child_text(self, name, strict=True):
"""Extract text of a child element. If strict, and child element is
not present, raises InvalidXMLError and otherwise returns
None.
"""
if strict:
try:
return self.element.find('s3:{}'.format(name), _S3_NS).text
except ETREE_EXCEPTIONS as error:
raise InvalidXMLError(
('Invalid XML provided for "{}" - erroring tag <{}>. '
'Message: {}').format(self.root_name, name, error)
)
else:
return self.element.findtext('s3:{}'.format(name), None, _S3_NS)
def get_urldecoded_elem_text(self, name, strict=True):
"""Like self.get_child_text(), but also performs urldecode() on the
result.
"""
text = self.get_child_text(name, strict)
# strictness is already enforced above.
return urldecode(text) if text is not None else None
def get_etag_elem(self, strict=True):
"""Fetches an 'ETag' child element suitably processed.
"""
return self.get_child_text('ETag', strict).replace('"', '')
def get_int_elem(self, name):
"""Fetches an integer type XML child element by name.
"""
return int(self.get_child_text(name))
def get_localized_time_elem(self, name):
"""Parse a time XML child element.
"""
return _iso8601_to_localized_time(self.get_child_text(name))
def text(self):
"""Fetch the current node's text
"""
return self.element.text
def is_dir(self):
"""Returns True if the object is a dir
ie, if an object name has `/` suffixed.
"""
text = self.get_child_text('Key')
return text.endswith("/")
def parse_multipart_upload_result(data):
"""
Parser for complete multipart upload response.
:param data: Response data for complete multipart upload.
:return: :class:`MultipartUploadResult <MultipartUploadResult>`.
"""
root = S3Element.fromstring('CompleteMultipartUploadResult', data)
return MultipartUploadResult(
root.get_child_text('Bucket'),
root.get_child_text('Key'),
root.get_child_text('Location'),
root.get_etag_elem()
)
def parse_copy_object(bucket_name, object_name, data):
"""
Parser for copy object response.
:param data: Response data for copy object.
:return: :class:`CopyObjectResult <CopyObjectResult>`
"""
root = S3Element.fromstring('CopyObjectResult', data)
return CopyObjectResult(
bucket_name, object_name,
root.get_etag_elem(),
root.get_localized_time_elem('LastModified')
)
def parse_list_buckets(data):
"""
Parser for list buckets response.
:param data: Response data for list buckets.
:return: List of :class:`Bucket <Bucket>`.
"""
root = S3Element.fromstring('ListBucketsResult', data)
return [
Bucket(bucket.get_child_text('Name'),
bucket.get_localized_time_elem('CreationDate'))
for buckets in root.findall('Buckets')
for bucket in buckets.findall('Bucket')
]
def _parse_objects_from_xml_elts(bucket_name, contents, common_prefixes):
"""Internal function that extracts objects and common prefixes from
list_objects responses.
"""
objects = [
Object(bucket_name,
content.get_child_text('Key'),
content.get_localized_time_elem('LastModified'),
content.get_etag_elem(strict=False),
content.get_int_elem('Size'),
is_dir=content.is_dir())
for content in contents
]
object_dirs = [
Object(bucket_name, dir_elt.text(), None, '',
0, is_dir=True)
for dirs_elt in common_prefixes
for dir_elt in dirs_elt.findall('Prefix')
]
return objects, object_dirs
def parse_list_objects(data, bucket_name):
"""
Parser for list objects response.
:param data: Response data for list objects.
:param bucket_name: Response for the bucket.
:return: Replies back three distinctive components.
- List of :class:`Object <Object>`
- True if list is truncated, False otherwise.
- Object name marker for the next request.
"""
root = S3Element.fromstring('ListObjectResult', data)
is_truncated = root.get_child_text('IsTruncated').lower() == 'true'
# NextMarker element need not be present.
marker = root.get_urldecoded_elem_text('NextMarker', strict=False)
objects, object_dirs = _parse_objects_from_xml_elts(
bucket_name,
root.findall('Contents'),
root.findall('CommonPrefixes')
)
if is_truncated and marker is None:
marker = objects[-1].object_name
return objects + object_dirs, is_truncated, marker
def parse_list_objects_v2(data, bucket_name):
"""
Parser for list objects version 2 response.
:param data: Response data for list objects.
:param bucket_name: Response for the bucket.
:return: Returns three distinct components:
- List of :class:`Object <Object>`
- True if list is truncated, False otherwise.
- Continuation Token for the next request.
"""
root = S3Element.fromstring('ListObjectV2Result', data)
is_truncated = root.get_child_text('IsTruncated').lower() == 'true'
# NextContinuationToken may not be present.
continuation_token = root.get_child_text('NextContinuationToken',
strict=False)
objects, object_dirs = _parse_objects_from_xml_elts(
bucket_name,
root.findall('Contents'),
root.findall('CommonPrefixes')
)
return objects + object_dirs, is_truncated, continuation_token
def parse_list_multipart_uploads(data, bucket_name):
"""
Parser for list multipart uploads response.
:param data: Response data for list multipart uploads.
:param bucket_name: Response for the bucket.
:return: Replies back four distinctive components.
- List of :class:`IncompleteUpload <IncompleteUpload>`
- True if list is truncated, False otherwise.
- Object name marker for the next request.
- Upload id marker for the next request.
"""
root = S3Element.fromstring('ListMultipartUploadsResult', data)
is_truncated = root.get_child_text('IsTruncated').lower() == 'true'
key_marker = root.get_urldecoded_elem_text('NextKeyMarker', strict=False)
upload_id_marker = root.get_child_text('NextUploadIdMarker', strict=False)
uploads = [
IncompleteUpload(bucket_name,
upload.get_urldecoded_elem_text('Key'),
upload.get_child_text('UploadId'),
upload.get_localized_time_elem('Initiated'))
for upload in root.findall('Upload')
]
return uploads, is_truncated, key_marker, upload_id_marker
def parse_list_parts(data, bucket_name, object_name, upload_id):
"""
Parser for list parts response.
:param data: Response data for list parts.
:param bucket_name: Response for the bucket.
:param object_name: Response for the object.
:param upload_id: Upload id of object name for
the active multipart session.
:return: Replies back three distinctive components.
- List of :class:`UploadPart <UploadPart>`.
- True if list is truncated, False otherwise.
- Next part marker for the next request if the
list was truncated.
"""
root = S3Element.fromstring('ListPartsResult', data)
is_truncated = root.get_child_text('IsTruncated').lower() == 'true'
part_marker = root.get_child_text('NextPartNumberMarker', strict=False)
parts = [
UploadPart(bucket_name, object_name, upload_id,
part.get_int_elem('PartNumber'),
part.get_etag_elem(),
part.get_localized_time_elem('LastModified'),
part.get_int_elem('Size'))
for part in root.findall('Part')
]
return parts, is_truncated, part_marker
def parse_new_multipart_upload(data):
"""
Parser for new multipart upload response.
:param data: Response data for new multipart upload.
:return: Returns a upload id.
"""
root = S3Element.fromstring('InitiateMultipartUploadResult', data)
return root.get_child_text('UploadId')
def parse_location_constraint(data):
"""
Parser for location constraint response.
:param data: Response data for get bucket location.
:return: Returns location of your bucket.
"""
root = S3Element.fromstring('BucketLocationConstraintResult', data)
return root.text()
def _iso8601_to_localized_time(date_string):
"""
Convert iso8601 date string into UTC time.
:param date_string: iso8601 formatted date string.
:return: :class:`datetime.datetime`
"""
# Handle timestamps with and without fractional seconds. Some non-AWS
# vendors (e.g. Dell EMC ECS) are not consistent about always providing
# fractional seconds.
try:
parsed_date = datetime.strptime(date_string, '%Y-%m-%dT%H:%M:%S.%fZ')
except ValueError:
parsed_date = datetime.strptime(date_string, '%Y-%m-%dT%H:%M:%SZ')
localized_time = pytz.utc.localize(parsed_date)
return localized_time
def parse_get_bucket_notification(data):
"""
Parser for a get_bucket_notification response from S3.
:param data: Body of response from get_bucket_notification.
:return: Returns bucket notification configuration
"""
root = S3Element.fromstring('GetBucketNotificationResult', data)
notifications = _parse_add_notifying_service_config(
root, {},
'TopicConfigurations', 'TopicConfiguration'
)
notifications = _parse_add_notifying_service_config(
root, notifications,
'QueueConfigurations', 'QueueConfiguration'
)
notifications = _parse_add_notifying_service_config(
root, notifications,
'CloudFunctionConfigurations', 'CloudFunctionConfiguration'
)
return notifications
def _parse_add_notifying_service_config(data, notifications, service_key,
service_xml_tag):
arn_elt_name = NOTIFICATIONS_ARN_FIELDNAME_MAP[service_xml_tag]
config = []
for service in data.findall(service_xml_tag):
config_item = {}
config_item['Id'] = service.get_child_text('Id')
config_item['Arn'] = service.get_child_text(arn_elt_name)
config_item['Events'] = [
event.text() for event in service.findall('Event')
]
filter_terms = [
{
'Key': {
'FilterRules': [
{
'Name': xml_filter_rule.get_child_text('Name'),
'Value': xml_filter_rule.get_child_text('Value'),
}
for xml_filter_rule in xml_filter_rules.findall(
'./S3Key/FilterRule')
]
}
}
for xml_filter_rules in service.findall('Filter')
]
if len(filter_terms) > 0:
config_item['Filter'] = filter_terms
config.append(config_item)
if len(config) > 0:
notifications[service_key] = config
return notifications
def parse_multi_object_delete_response(data):
"""Parser for Multi-Object Delete API response.
:param data: XML response body content from service.
:return: Returns list of error objects for each delete object that
had an error.
"""
root = S3Element.fromstring('MultiObjectDeleteResult', data)
return [
MultiDeleteError(errtag.get_child_text('
321C
;Key'),
errtag.get_child_text('Code'),
errtag.get_child_text('Message'))
for errtag in root.findall('Error')
]