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AWS-DDNS/Function Source Files/botocore/handlers.py

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# Copyright 2012-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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.
"""Builtin event handlers.
This module contains builtin handlers for events emitted by botocore.
"""
import base64
import copy
import logging
import os
import re
import uuid
import warnings
from io import BytesIO
import botocore
import botocore.auth
from botocore import utils
from botocore.compat import (
ETree,
OrderedDict,
XMLParseError,
ensure_bytes,
get_md5,
json,
quote,
unquote,
unquote_str,
urlsplit,
urlunsplit,
)
from botocore.docs.utils import (
AppendParamDocumentation,
AutoPopulatedParam,
HideParamFromOperations,
)
from botocore.endpoint_provider import VALID_HOST_LABEL_RE
from botocore.exceptions import (
AliasConflictParameterError,
ParamValidationError,
UnsupportedTLSVersionWarning,
)
from botocore.regions import EndpointResolverBuiltins
from botocore.signers import (
add_generate_db_auth_token,
add_generate_presigned_post,
add_generate_presigned_url,
)
from botocore.utils import (
SAFE_CHARS,
ArnParser,
conditionally_calculate_checksum,
conditionally_calculate_md5,
percent_encode,
switch_host_with_param,
)
# Keep these imported. There's pre-existing code that uses them.
from botocore import retryhandler # noqa
from botocore import translate # noqa
from botocore.compat import MD5_AVAILABLE # noqa
from botocore.exceptions import MissingServiceIdError # noqa
from botocore.utils import hyphenize_service_id # noqa
from botocore.utils import is_global_accesspoint # noqa
from botocore.utils import SERVICE_NAME_ALIASES # noqa
logger = logging.getLogger(__name__)
REGISTER_FIRST = object()
REGISTER_LAST = object()
# From the S3 docs:
# The rules for bucket names in the US Standard region allow bucket names
# to be as long as 255 characters, and bucket names can contain any
# combination of uppercase letters, lowercase letters, numbers, periods
# (.), hyphens (-), and underscores (_).
VALID_BUCKET = re.compile(r'^[a-zA-Z0-9.\-_]{1,255}$')
_ACCESSPOINT_ARN = (
r'^arn:(aws).*:(s3|s3-object-lambda):[a-z\-0-9]*:[0-9]{12}:accesspoint[/:]'
r'[a-zA-Z0-9\-.]{1,63}$'
)
_OUTPOST_ARN = (
r'^arn:(aws).*:s3-outposts:[a-z\-0-9]+:[0-9]{12}:outpost[/:]'
r'[a-zA-Z0-9\-]{1,63}[/:]accesspoint[/:][a-zA-Z0-9\-]{1,63}$'
)
VALID_S3_ARN = re.compile('|'.join([_ACCESSPOINT_ARN, _OUTPOST_ARN]))
# signing names used for the services s3 and s3-control, for example in
# botocore/data/s3/2006-03-01/endpoints-rule-set-1.json
S3_SIGNING_NAMES = ('s3', 's3-outposts', 's3-object-lambda', 's3express')
VERSION_ID_SUFFIX = re.compile(r'\?versionId=[^\s]+$')
def handle_service_name_alias(service_name, **kwargs):
return SERVICE_NAME_ALIASES.get(service_name, service_name)
def add_recursion_detection_header(params, **kwargs):
has_lambda_name = 'AWS_LAMBDA_FUNCTION_NAME' in os.environ
trace_id = os.environ.get('_X_AMZN_TRACE_ID')
if has_lambda_name and trace_id:
headers = params['headers']
if 'X-Amzn-Trace-Id' not in headers:
headers['X-Amzn-Trace-Id'] = quote(trace_id, safe='-=;:+&[]{}"\',')
def escape_xml_payload(params, **kwargs):
# Replace \r and \n with the escaped sequence over the whole XML document
# to avoid linebreak normalization modifying customer input when the
# document is parsed. Ideally, we would do this in ElementTree.tostring,
# but it doesn't allow us to override entity escaping for text fields. For
# this operation \r and \n can only appear in the XML document if they were
# passed as part of the customer input.
body = params['body']
if b'\r' in body:
body = body.replace(b'\r', b'
')
if b'\n' in body:
body = body.replace(b'\n', b'
')
params['body'] = body
def check_for_200_error(response, **kwargs):
# From: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectCOPY.html
# There are two opportunities for a copy request to return an error. One
# can occur when Amazon S3 receives the copy request and the other can
# occur while Amazon S3 is copying the files. If the error occurs before
# the copy operation starts, you receive a standard Amazon S3 error. If the
# error occurs during the copy operation, the error response is embedded in
# the 200 OK response. This means that a 200 OK response can contain either
# a success or an error. Make sure to design your application to parse the
# contents of the response and handle it appropriately.
#
# So this handler checks for this case. Even though the server sends a
# 200 response, conceptually this should be handled exactly like a
# 500 response (with respect to raising exceptions, retries, etc.)
# We're connected *before* all the other retry logic handlers, so as long
# as we switch the error code to 500, we'll retry the error as expected.
if response is None:
# A None response can happen if an exception is raised while
# trying to retrieve the response. See Endpoint._get_response().
return
http_response, parsed = response
if _looks_like_special_case_error(http_response):
logger.debug(
"Error found for response with 200 status code, "
"errors: %s, changing status code to "
"500.",
parsed,
)
http_response.status_code = 500
def _looks_like_special_case_error(http_response):
if http_response.status_code == 200:
try:
parser = ETree.XMLParser(
target=ETree.TreeBuilder(), encoding='utf-8'
)
parser.feed(http_response.content)
root = parser.close()
except XMLParseError:
# In cases of network disruptions, we may end up with a partial
# streamed response from S3. We need to treat these cases as
# 500 Service Errors and try again.
return True
if root.tag == 'Error':
return True
return False
def set_operation_specific_signer(context, signing_name, **kwargs):
"""Choose the operation-specific signer.
Individual operations may have a different auth type than the service as a
whole. This will most often manifest as operations that should not be
authenticated at all, but can include other auth modes such as sigv4
without body signing.
"""
auth_type = context.get('auth_type')
# Auth type will be None if the operation doesn't have a configured auth
# type.
if not auth_type:
return
# Auth type will be the string value 'none' if the operation should not
# be signed at all.
if auth_type == 'none':
return botocore.UNSIGNED
if auth_type == 'bearer':
return 'bearer'
if auth_type.startswith('v4'):
if auth_type == 'v4-s3express':
return auth_type
if auth_type == 'v4a':
# If sigv4a is chosen, we must add additional signing config for
# global signature.
signing = {'region': '*', 'signing_name': signing_name}
if 'signing' in context:
context['signing'].update(signing)
else:
context['signing'] = signing
signature_version = 'v4a'
else:
signature_version = 'v4'
# If the operation needs an unsigned body, we set additional context
# allowing the signer to be aware of this.
if auth_type == 'v4-unsigned-body':
context['payload_signing_enabled'] = False
# Signing names used by s3 and s3-control use customized signers "s3v4"
# and "s3v4a".
if signing_name in S3_SIGNING_NAMES:
signature_version = f's3{signature_version}'
return signature_version
def decode_console_output(parsed, **kwargs):
if 'Output' in parsed:
try:
# We're using 'replace' for errors because it is
# possible that console output contains non string
# chars we can't utf-8 decode.
value = base64.b64decode(
bytes(parsed['Output'], 'latin-1')
).decode('utf-8', 'replace')
parsed['Output'] = value
except (ValueError, TypeError, AttributeError):
logger.debug('Error decoding base64', exc_info=True)
def generate_idempotent_uuid(params, model, **kwargs):
for name in model.idempotent_members:
if name not in params:
params[name] = str(uuid.uuid4())
logger.debug(
"injecting idempotency token (%s) into param '%s'."
% (params[name], name)
)
def decode_quoted_jsondoc(value):
try:
value = json.loads(unquote(value))
except (ValueError, TypeError):
logger.debug('Error loading quoted JSON', exc_info=True)
return value
def json_decode_template_body(parsed, **kwargs):
if 'TemplateBody' in parsed:
try:
value = json.loads(
parsed['TemplateBody'], object_pairs_hook=OrderedDict
)
parsed['TemplateBody'] = value
except (ValueError, TypeError):
logger.debug('error loading JSON', exc_info=True)
def validate_bucket_name(params, **kwargs):
if 'Bucket' not in params:
return
bucket = params['Bucket']
if not VALID_BUCKET.search(bucket) and not VALID_S3_ARN.search(bucket):
error_msg = (
f'Invalid bucket name "{bucket}": Bucket name must match '
f'the regex "{VALID_BUCKET.pattern}" or be an ARN matching '
f'the regex "{VALID_S3_ARN.pattern}"'
)
raise ParamValidationError(report=error_msg)
def sse_md5(params, **kwargs):
"""
S3 server-side encryption requires the encryption key to be sent to the
server base64 encoded, as well as a base64-encoded MD5 hash of the
encryption key. This handler does both if the MD5 has not been set by
the caller.
"""
_sse_md5(params, 'SSECustomer')
def copy_source_sse_md5(params, **kwargs):
"""
S3 server-side encryption requires the encryption key to be sent to the
server base64 encoded, as well as a base64-encoded MD5 hash of the
encryption key. This handler does both if the MD5 has not been set by
the caller specifically if the parameter is for the copy-source sse-c key.
"""
_sse_md5(params, 'CopySourceSSECustomer')
def _sse_md5(params, sse_member_prefix='SSECustomer'):
if not _needs_s3_sse_customization(params, sse_member_prefix):
return
sse_key_member = sse_member_prefix + 'Key'
sse_md5_member = sse_member_prefix + 'KeyMD5'
key_as_bytes = params[sse_key_member]
if isinstance(key_as_bytes, str):
key_as_bytes = key_as_bytes.encode('utf-8')
key_md5_str = base64.b64encode(get_md5(key_as_bytes).digest()).decode(
'utf-8'
)
key_b64_encoded = base64.b64encode(key_as_bytes).decode('utf-8')
params[sse_key_member] = key_b64_encoded
params[sse_md5_member] = key_md5_str
def _needs_s3_sse_customization(params, sse_member_prefix):
return (
params.get(sse_member_prefix + 'Key') is not None
and sse_member_prefix + 'KeyMD5' not in params
)
def disable_signing(**kwargs):
"""
This handler disables request signing by setting the signer
name to a special sentinel value.
"""
return botocore.UNSIGNED
def add_expect_header(model, params, **kwargs):
if model.http.get('method', '') not in ['PUT', 'POST']:
return
if 'body' in params:
body = params['body']
if hasattr(body, 'read'):
# Any file like object will use an expect 100-continue
# header regardless of size.
logger.debug("Adding expect 100 continue header to request.")
params['headers']['Expect'] = '100-continue'
class DeprecatedServiceDocumenter:
def __init__(self, replacement_service_name):
self._replacement_service_name = replacement_service_name
def inject_deprecation_notice(self, section, event_name, **kwargs):
section.style.start_important()
section.write('This service client is deprecated. Please use ')
section.style.ref(
self._replacement_service_name,
self._replacement_service_name,
)
section.write(' instead.')
section.style.end_important()
def document_copy_source_form(section, event_name, **kwargs):
if 'request-example' in event_name:
parent = section.get_section('structure-value')
param_line = parent.get_section('CopySource')
value_portion = param_line.get_section('member-value')
value_portion.clear_text()
value_portion.write(
"'string' or {'Bucket': 'string', "
"'Key': 'string', 'VersionId': 'string'}"
)
elif 'request-params' in event_name:
param_section = section.get_section('CopySource')
type_section = param_section.get_section('param-type')
type_section.clear_text()
type_section.write(':type CopySource: str or dict')
doc_section = param_section.get_section('param-documentation')
doc_section.clear_text()
doc_section.write(
"The name of the source bucket, key name of the source object, "
"and optional version ID of the source object. You can either "
"provide this value as a string or a dictionary. The "
"string form is {bucket}/{key} or "
"{bucket}/{key}?versionId={versionId} if you want to copy a "
"specific version. You can also provide this value as a "
"dictionary. The dictionary format is recommended over "
"the string format because it is more explicit. The dictionary "
"format is: {'Bucket': 'bucket', 'Key': 'key', 'VersionId': 'id'}."
" Note that the VersionId key is optional and may be omitted."
" To specify an S3 access point, provide the access point"
" ARN for the ``Bucket`` key in the copy source dictionary. If you"
" want to provide the copy source for an S3 access point as a"
" string instead of a dictionary, the ARN provided must be the"
" full S3 access point object ARN"
" (i.e. {accesspoint_arn}/object/{key})"
)
def handle_copy_source_param(params, **kwargs):
"""Convert CopySource param for CopyObject/UploadPartCopy.
This handler will deal with two cases:
* CopySource provided as a string. We'll make a best effort
to URL encode the key name as required. This will require
parsing the bucket and version id from the CopySource value
and only encoding the key.
* CopySource provided as a dict. In this case we're
explicitly given the Bucket, Key, and VersionId so we're
able to encode the key and ensure this value is serialized
and correctly sent to S3.
"""
source = params.get('CopySource')
if source is None:
# The call will eventually fail but we'll let the
# param validator take care of this. It will
# give a better error message.
return
if isinstance(source, str):
params['CopySource'] = _quote_source_header(source)
elif isinstance(source, dict):
params['CopySource'] = _quote_source_header_from_dict(source)
def _quote_source_header_from_dict(source_dict):
try:
bucket = source_dict['Bucket']
key = source_dict['Key']
version_id = source_dict.get('VersionId')
if VALID_S3_ARN.search(bucket):
final = f'{bucket}/object/{key}'
else:
final = f'{bucket}/{key}'
except KeyError as e:
raise ParamValidationError(
report=f'Missing required parameter: {str(e)}'
)
final = percent_encode(final, safe=SAFE_CHARS + '/')
if version_id is not None:
final += '?versionId=%s' % version_id
return final
def _quote_source_header(value):
result = VERSION_ID_SUFFIX.search(value)
if result is None:
return percent_encode(value, safe=SAFE_CHARS + '/')
else:
first, version_id = value[: result.start()], value[result.start() :]
return percent_encode(first, safe=SAFE_CHARS + '/') + version_id
def _get_cross_region_presigned_url(
request_signer, request_dict, model, source_region, destination_region
):
# The better way to do this is to actually get the
# endpoint_resolver and get the endpoint_url given the
# source region. In this specific case, we know that
# we can safely replace the dest region with the source
# region because of the supported EC2 regions, but in
# general this is not a safe assumption to make.
# I think eventually we should try to plumb through something
# that allows us to resolve endpoints from regions.
request_dict_copy = copy.deepcopy(request_dict)
request_dict_copy['body']['DestinationRegion'] = destination_region
request_dict_copy['url'] = request_dict['url'].replace(
destination_region, source_region
)
request_dict_copy['method'] = 'GET'
request_dict_copy['headers'] = {}
return request_signer.generate_presigned_url(
request_dict_copy, region_name=source_region, operation_name=model.name
)
def _get_presigned_url_source_and_destination_regions(request_signer, params):
# Gets the source and destination regions to be used
destination_region = request_signer._region_name
source_region = params.get('SourceRegion')
return source_region, destination_region
def inject_presigned_url_ec2(params, request_signer, model, **kwargs):
# The customer can still provide this, so we should pass if they do.
if 'PresignedUrl' in params['body']:
return
src, dest = _get_presigned_url_source_and_destination_regions(
request_signer, params['body']
)
url = _get_cross_region_presigned_url(
request_signer, params, model, src, dest
)
params['body']['PresignedUrl'] = url
# EC2 Requires that the destination region be sent over the wire in
# addition to the source region.
params['body']['DestinationRegion'] = dest
def inject_presigned_url_rds(params, request_signer, model, **kwargs):
# SourceRegion is not required for RDS operations, so it's possible that
# it isn't set. In that case it's probably a local copy so we don't need
# to do anything else.
if 'SourceRegion' not in params['body']:
return
src, dest = _get_presigned_url_source_and_destination_regions(
request_signer, params['body']
)
# Since SourceRegion isn't actually modeled for RDS, it needs to be
# removed from the request params before we send the actual request.
del params['body']['SourceRegion']
if 'PreSignedUrl' in params['body']:
return
url = _get_cross_region_presigned_url(
request_signer, params, model, src, dest
)
params['body']['PreSignedUrl'] = url
def json_decode_policies(parsed, model, **kwargs):
# Any time an IAM operation returns a policy document
# it is a string that is json that has been urlencoded,
# i.e urlencode(json.dumps(policy_document)).
# To give users something more useful, we will urldecode
# this value and json.loads() the result so that they have
# the policy document as a dictionary.
output_shape = model.output_shape
if output_shape is not None:
_decode_policy_types(parsed, model.output_shape)
def _decode_policy_types(parsed, shape):
# IAM consistently uses the policyDocumentType shape to indicate
# strings that have policy documents.
shape_name = 'policyDocumentType'
if shape.type_name == 'structure':
for member_name, member_shape in shape.members.items():
if (
member_shape.type_name == 'string'
and member_shape.name == shape_name
and member_name in parsed
):
parsed[member_name] = decode_quoted_jsondoc(
parsed[member_name]
)
elif member_name in parsed:
_decode_policy_types(parsed[member_name], member_shape)
if shape.type_name == 'list':
shape_member = shape.member
for item in parsed:
_decode_policy_types(item, shape_member)
def parse_get_bucket_location(parsed, http_response, **kwargs):
# s3.GetBucketLocation cannot be modeled properly. To
# account for this we just manually parse the XML document.
# The "parsed" passed in only has the ResponseMetadata
# filled out. This handler will fill in the LocationConstraint
# value.
if http_response.raw is None:
return
response_body = http_response.content
parser = ETree.XMLParser(target=ETree.TreeBuilder(), encoding='utf-8')
parser.feed(response_body)
root = parser.close()
region = root.text
parsed['LocationConstraint'] = region
def base64_encode_user_data(params, **kwargs):
if 'UserData' in params:
if isinstance(params['UserData'], str):
# Encode it to bytes if it is text.
params['UserData'] = params['UserData'].encode('utf-8')
params['UserData'] = base64.b64encode(params['UserData']).decode(
'utf-8'
)
def document_base64_encoding(param):
description = (
'**This value will be base64 encoded automatically. Do '
'not base64 encode this value prior to performing the '
'operation.**'
)
append = AppendParamDocumentation(param, description)
return append.append_documentation
def validate_ascii_metadata(params, **kwargs):
"""Verify S3 Metadata only contains ascii characters.
From: http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html
"Amazon S3 stores user-defined metadata in lowercase. Each name, value pair
must conform to US-ASCII when using REST and UTF-8 when using SOAP or
browser-based uploads via POST."
"""
metadata = params.get('Metadata')
if not metadata or not isinstance(metadata, dict):
# We have to at least type check the metadata as a dict type
# because this handler is called before param validation.
# We'll go ahead and return because the param validator will
# give a descriptive error message for us.
# We might need a post-param validation event.
return
for key, value in metadata.items():
try:
key.encode('ascii')
value.encode('ascii')
except UnicodeEncodeError:
error_msg = (
'Non ascii characters found in S3 metadata '
'for key "%s", value: "%s". \nS3 metadata can only '
'contain ASCII characters. ' % (key, value)
)
raise ParamValidationError(report=error_msg)
def fix_route53_ids(params, model, **kwargs):
"""
Check for and split apart Route53 resource IDs, setting
only the last piece. This allows the output of one operation
(e.g. ``'foo/1234'``) to be used as input in another
operation (e.g. it expects just ``'1234'``).
"""
input_shape = model.input_shape
if not input_shape or not hasattr(input_shape, 'members'):
return
members = [
name
for (name, shape) in input_shape.members.items()
if shape.name in ['ResourceId', 'DelegationSetId', 'ChangeId']
]
for name in members:
if name in params:
orig_value = params[name]
params[name] = orig_value.split('/')[-1]
logger.debug('%s %s -> %s', name, orig_value, params[name])
def inject_account_id(params, **kwargs):
if params.get('accountId') is None:
# Glacier requires accountId, but allows you
# to specify '-' for the current owners account.
# We add this default value if the user does not
# provide the accountId as a convenience.
params['accountId'] = '-'
def add_glacier_version(model, params, **kwargs):
request_dict = params
request_dict['headers']['x-amz-glacier-version'] = model.metadata[
'apiVersion'
]
def add_accept_header(model, params, **kwargs):
if params['headers'].get('Accept', None) is None:
request_dict = params
request_dict['headers']['Accept'] = 'application/json'
def add_glacier_checksums(params, **kwargs):
"""Add glacier checksums to the http request.
This will add two headers to the http request:
* x-amz-content-sha256
* x-amz-sha256-tree-hash
These values will only be added if they are not present
in the HTTP request.
"""
request_dict = params
headers = request_dict['headers']
body = request_dict['body']
if isinstance(body, bytes):
# If the user provided a bytes type instead of a file
# like object, we're temporarily create a BytesIO object
# so we can use the util functions to calculate the
# checksums which assume file like objects. Note that
# we're not actually changing the body in the request_dict.
body = BytesIO(body)
starting_position = body.tell()
if 'x-amz-content-sha256' not in headers:
headers['x-amz-content-sha256'] = utils.calculate_sha256(
body, as_hex=True
)
body.seek(starting_position)
if 'x-amz-sha256-tree-hash' not in headers:
headers['x-amz-sha256-tree-hash'] = utils.calculate_tree_hash(body)
body.seek(starting_position)
def document_glacier_tree_hash_checksum():
doc = '''
This is a required field.
Ideally you will want to compute this value with checksums from
previous uploaded parts, using the algorithm described in
`Glacier documentation <http://docs.aws.amazon.com/amazonglacier/latest/dev/checksum-calculations.html>`_.
But if you prefer, you can also use botocore.utils.calculate_tree_hash()
to compute it from raw file by::
checksum = calculate_tree_hash(open('your_file.txt', 'rb'))
'''
return AppendParamDocumentation('checksum', doc).append_documentation
def document_cloudformation_get_template_return_type(
section, event_name, **kwargs
):
if 'response-params' in event_name:
template_body_section = section.get_section('TemplateBody')
type_section = template_body_section.get_section('param-type')
type_section.clear_text()
type_section.write('(*dict*) --')
elif 'response-example' in event_name:
parent = section.get_section('structure-value')
param_line = parent.get_section('TemplateBody')
value_portion = param_line.get_section('member-value')
value_portion.clear_text()
value_portion.write('{}')
def switch_host_machinelearning(request, **kwargs):
switch_host_with_param(request, 'PredictEndpoint')
def check_openssl_supports_tls_version_1_2(**kwargs):
import ssl
try:
openssl_version_tuple = ssl.OPENSSL_VERSION_INFO
if openssl_version_tuple < (1, 0, 1):
warnings.warn(
'Currently installed openssl version: %s does not '
'support TLS 1.2, which is required for use of iot-data. '
'Please use python installed with openssl version 1.0.1 or '
'higher.' % (ssl.OPENSSL_VERSION),
UnsupportedTLSVersionWarning,
)
# We cannot check the openssl version on python2.6, so we should just
# pass on this conveniency check.
except AttributeError:
pass
def change_get_to_post(request, **kwargs):
# This is useful when we need to change a potentially large GET request
# into a POST with x-www-form-urlencoded encoding.
if request.method == 'GET' and '?' in request.url:
request.headers['Content-Type'] = 'application/x-www-form-urlencoded'
request.method = 'POST'
request.url, request.data = request.url.split('?', 1)
def set_list_objects_encoding_type_url(params, context, **kwargs):
if 'EncodingType' not in params:
# We set this context so that we know it wasn't the customer that
# requested the encoding.
context['encoding_type_auto_set'] = True
params['EncodingType'] = 'url'
def decode_list_object(parsed, context, **kwargs):
# This is needed because we are passing url as the encoding type. Since the
# paginator is based on the key, we need to handle it before it can be
# round tripped.
#
# From the documentation: If you specify encoding-type request parameter,
# Amazon S3 includes this element in the response, and returns encoded key
# name values in the following response elements:
# Delimiter, Marker, Prefix, NextMarker, Key.
_decode_list_object(
top_level_keys=['Delimiter', 'Marker', 'NextMarker'],
nested_keys=[('Contents', 'Key'), ('CommonPrefixes', 'Prefix')],
parsed=parsed,
context=context,
)
def decode_list_object_v2(parsed, context, **kwargs):
# From the documentation: If you specify encoding-type request parameter,
# Amazon S3 includes this element in the response, and returns encoded key
# name values in the following response elements:
# Delimiter, Prefix, ContinuationToken, Key, and StartAfter.
_decode_list_object(
top_level_keys=['Delimiter', 'Prefix', 'StartAfter'],
nested_keys=[('Contents', 'Key'), ('CommonPrefixes', 'Prefix')],
parsed=parsed,
context=context,
)
def decode_list_object_versions(parsed, context, **kwargs):
# From the documentation: If you specify encoding-type request parameter,
# Amazon S3 includes this element in the response, and returns encoded key
# name values in the following response elements:
# KeyMarker, NextKeyMarker, Prefix, Key, and Delimiter.
_decode_list_object(
top_level_keys=[
'KeyMarker',
'NextKeyMarker',
'Prefix',
'Delimiter',
],
nested_keys=[
('Versions', 'Key'),
('DeleteMarkers', 'Key'),
('CommonPrefixes', 'Prefix'),
],
parsed=parsed,
context=context,
)
def _decode_list_object(top_level_keys, nested_keys, parsed, context):
if parsed.get('EncodingType') == 'url' and context.get(
'encoding_type_auto_set'
):
# URL decode top-level keys in the response if present.
for key in top_level_keys:
if key in parsed:
parsed[key] = unquote_str(parsed[key])
# URL decode nested keys from the response if present.
for top_key, child_key in nested_keys:
if top_key in parsed:
for member in parsed[top_key]:
member[child_key] = unquote_str(member[child_key])
def convert_body_to_file_like_object(params, **kwargs):
if 'Body' in params:
if isinstance(params['Body'], str):
params['Body'] = BytesIO(ensure_bytes(params['Body']))
elif isinstance(params['Body'], bytes):
params['Body'] = BytesIO(params['Body'])
def _add_parameter_aliases(handler_list):
# Mapping of original parameter to parameter alias.
# The key is <service>.<operation>.parameter
# The first part of the key is used for event registration.
# The last part is the original parameter name and the value is the
# alias to expose in documentation.
aliases = {
'ec2.*.Filter': 'Filters',
'logs.CreateExportTask.from': 'fromTime',
'cloudsearchdomain.Search.return': 'returnFields',
}
for original, new_name in aliases.items():
event_portion, original_name = original.rsplit('.', 1)
parameter_alias = ParameterAlias(original_name, new_name)
# Add the handlers to the list of handlers.
# One handler is to handle when users provide the alias.
# The other handler is to update the documentation to show only
# the alias.
parameter_build_event_handler_tuple = (
'before-parameter-build.' + event_portion,
parameter_alias.alias_parameter_in_call,
REGISTER_FIRST,
)
docs_event_handler_tuple = (
'docs.*.' + event_portion + '.complete-section',
parameter_alias.alias_parameter_in_documentation,
)
handler_list.append(parameter_build_event_handler_tuple)
handler_list.append(docs_event_handler_tuple)
class ParameterAlias:
def __init__(self, original_name, alias_name):
self._original_name = original_name
self._alias_name = alias_name
def alias_parameter_in_call(self, params, model, **kwargs):
if model.input_shape:
# Only consider accepting the alias if it is modeled in the
# input shape.
if self._original_name in model.input_shape.members:
if self._alias_name in params:
if self._original_name in params:
raise AliasConflictParameterError(
original=self._original_name,
alias=self._alias_name,
operation=model.name,
)
# Remove the alias parameter value and use the old name
# instead.
params[self._original_name] = params.pop(self._alias_name)
def alias_parameter_in_documentation(self, event_name, section, **kwargs):
if event_name.startswith('docs.request-params'):
if self._original_name not in section.available_sections:
return
# Replace the name for parameter type
param_section = section.get_section(self._original_name)
param_type_section = param_section.get_section('param-type')
self._replace_content(param_type_section)
# Replace the name for the parameter description
param_name_section = param_section.get_section('param-name')
self._replace_content(param_name_section)
elif event_name.startswith('docs.request-example'):
section = section.get_section('structure-value')
if self._original_name not in section.available_sections:
return
# Replace the name for the example
param_section = section.get_section(self._original_name)
self._replace_content(param_section)
def _replace_content(self, section):
content = section.getvalue().decode('utf-8')
updated_content = content.replace(
self._original_name, self._alias_name
)
section.clear_text()
section.write(updated_content)
class ClientMethodAlias:
def __init__(self, actual_name):
"""Aliases a non-extant method to an existing method.
:param actual_name: The name of the method that actually exists on
the client.
"""
self._actual = actual_name
def __call__(self, client, **kwargs):
return getattr(client, self._actual)
# TODO: Remove this class as it is no longer used
class HeaderToHostHoister:
"""Takes a header and moves it to the front of the hoststring."""
_VALID_HOSTNAME = re.compile(r'(?!-)[a-z\d-]{1,63}(?<!-)$', re.IGNORECASE)
def __init__(self, header_name):
self._header_name = header_name
def hoist(self, params, **kwargs):
"""Hoist a header to the hostname.
Hoist a header to the beginning of the hostname with a suffix "." after
it. The original header should be removed from the header map. This
method is intended to be used as a target for the before-call event.
"""
if self._header_name not in params['headers']:
return
header_value = params['headers'][self._header_name]
self._ensure_header_is_valid_host(header_value)
original_url = params['url']
new_url = self._prepend_to_host(original_url, header_value)
params['url'] = new_url
def _ensure_header_is_valid_host(self, header):
match = self._VALID_HOSTNAME.match(header)
if not match:
raise ParamValidationError(
report=(
'Hostnames must contain only - and alphanumeric characters, '
'and between 1 and 63 characters long.'
)
)
def _prepend_to_host(self, url, prefix):
url_components = urlsplit(url)
parts = url_components.netloc.split('.')
parts = [prefix] + parts
new_netloc = '.'.join(parts)
new_components = (
url_components.scheme,
new_netloc,
url_components.path,
url_components.query,
'',
)
new_url = urlunsplit(new_components)
return new_url
def inject_api_version_header_if_needed(model, params, **kwargs):
if not model.is_endpoint_discovery_operation:
return
params['headers']['x-amz-api-version'] = model.service_model.api_version
def remove_lex_v2_start_conversation(class_attributes, **kwargs):
"""Operation requires h2 which is currently unsupported in Python"""
if 'start_conversation' in class_attributes:
del class_attributes['start_conversation']
def add_retry_headers(request, **kwargs):
retries_context = request.context.get('retries')
if not retries_context:
return
headers = request.headers
headers['amz-sdk-invocation-id'] = retries_context['invocation-id']
sdk_retry_keys = ('ttl', 'attempt', 'max')
sdk_request_headers = [
f'{key}={retries_context[key]}'
for key in sdk_retry_keys
if key in retries_context
]
headers['amz-sdk-request'] = '; '.join(sdk_request_headers)
def remove_bucket_from_url_paths_from_model(params, model, context, **kwargs):
"""Strips leading `{Bucket}/` from any operations that have it.
The original value is retained in a separate "authPath" field. This is
used in the HmacV1Auth signer. See HmacV1Auth.canonical_resource in
botocore/auth.py for details.
This change is applied to the operation model during the first time the
operation is invoked and then stays in effect for the lifetime of the
client object.
When the ruleset based endpoint resolver is in effect, both the endpoint
ruleset AND the service model place the bucket name in the final URL.
The result is an invalid URL. This handler modifies the operation model to
no longer place the bucket name. Previous versions of botocore fixed the
URL after the fact when necessary. Since the introduction of ruleset based
endpoint resolution, the problem exists in ALL URLs that contain a bucket
name and can therefore be addressed before the URL gets assembled.
"""
req_uri = model.http['requestUri']
bucket_path = '/{Bucket}'
if req_uri.startswith(bucket_path):
model.http['requestUri'] = req_uri[len(bucket_path) :]
# Strip query off the requestUri before using as authPath. The
# HmacV1Auth signer will append query params to the authPath during
# signing.
req_uri = req_uri.split('?')[0]
# If the request URI is ONLY a bucket, the auth_path must be
# terminated with a '/' character to generate a signature that the
# server will accept.
needs_slash = req_uri == bucket_path
model.http['authPath'] = f'{req_uri}/' if needs_slash else req_uri
def remove_accid_host_prefix_from_model(params, model, context, **kwargs):
"""Removes the `{AccountId}.` prefix from the operation model.
This change is applied to the operation model during the first time the
operation is invoked and then stays in effect for the lifetime of the
client object.
When the ruleset based endpoint resolver is in effect, both the endpoint
ruleset AND the service model place the {AccountId}. prefix in the URL.
The result is an invalid endpoint. This handler modifies the operation
model to remove the `endpoint.hostPrefix` field while leaving the
`RequiresAccountId` static context parameter in place.
"""
has_ctx_param = any(
ctx_param.name == 'RequiresAccountId' and ctx_param.value is True
for ctx_param in model.static_context_parameters
)
if (
model.endpoint is not None
and model.endpoint.get('hostPrefix') == '{AccountId}.'
and has_ctx_param
):
del model.endpoint['hostPrefix']
def remove_arn_from_signing_path(request, **kwargs):
auth_path = request.auth_path
if isinstance(auth_path, str) and auth_path.startswith('/arn%3A'):
auth_path_parts = auth_path.split('/')
if len(auth_path_parts) > 1 and ArnParser.is_arn(
unquote(auth_path_parts[1])
):
request.auth_path = '/'.join(['', *auth_path_parts[2:]])
def customize_endpoint_resolver_builtins(
builtins, model, params, context, **kwargs
):
"""Modify builtin parameter values for endpoint resolver
Modifies the builtins dict in place. Changes are in effect for one call.
The corresponding event is emitted only if at least one builtin parameter
value is required for endpoint resolution for the operation.
"""
bucket_name = params.get('Bucket')
bucket_is_arn = bucket_name is not None and ArnParser.is_arn(bucket_name)
# In some situations the host will return AuthorizationHeaderMalformed
# when the signing region of a sigv4 request is not the bucket's
# region (which is likely unknown by the user of GetBucketLocation).
# Avoid this by always using path-style addressing.
if model.name == 'GetBucketLocation':
builtins[EndpointResolverBuiltins.AWS_S3_FORCE_PATH_STYLE] = True
# All situations where the bucket name is an ARN are not compatible
# with path style addressing.
elif bucket_is_arn:
builtins[EndpointResolverBuiltins.AWS_S3_FORCE_PATH_STYLE] = False
# Bucket names that are invalid host labels require path-style addressing.
# If path-style addressing was specifically requested, the default builtin
# value is already set.
path_style_required = (
bucket_name is not None and not VALID_HOST_LABEL_RE.match(bucket_name)
)
path_style_requested = builtins[
EndpointResolverBuiltins.AWS_S3_FORCE_PATH_STYLE
]
# Path-style addressing is incompatible with the global endpoint for
# presigned URLs. If the bucket name is an ARN, the ARN's region should be
# used in the endpoint.
if (
context.get('use_global_endpoint')
and not path_style_required
and not path_style_requested
and not bucket_is_arn
and not utils.is_s3express_bucket(bucket_name)
):
builtins[EndpointResolverBuiltins.AWS_REGION] = 'aws-global'
builtins[EndpointResolverBuiltins.AWS_S3_USE_GLOBAL_ENDPOINT] = True
def remove_content_type_header_for_presigning(request, **kwargs):
if (
request.context.get('is_presign_request') is True
and 'Content-Type' in request.headers
):
del request.headers['Content-Type']
# This is a list of (event_name, handler).
# When a Session is created, everything in this list will be
# automatically registered with that Session.
BUILTIN_HANDLERS = [
('choose-service-name', handle_service_name_alias),
(
'getattr.mturk.list_hi_ts_for_qualification_type',
ClientMethodAlias('list_hits_for_qualification_type'),
),
(
'before-parameter-build.s3.UploadPart',
convert_body_to_file_like_object,
REGISTER_LAST,
),
(
'before-parameter-build.s3.PutObject',
convert_body_to_file_like_object,
REGISTER_LAST,
),
('creating-client-class', add_generate_presigned_url),
('creating-client-class.s3', add_generate_presigned_post),
('creating-client-class.iot-data', check_openssl_supports_tls_version_1_2),
('creating-client-class.lex-runtime-v2', remove_lex_v2_start_conversation),
('after-call.iam', json_decode_policies),
('after-call.ec2.GetConsoleOutput', decode_console_output),
('after-call.cloudformation.GetTemplate', json_decode_template_body),
('after-call.s3.GetBucketLocation', parse_get_bucket_location),
('before-parameter-build', generate_idempotent_uuid),
('before-parameter-build.s3', validate_bucket_name),
('before-parameter-build.s3', remove_bucket_from_url_paths_from_model),
(
'before-parameter-build.s3.ListObjects',
set_list_objects_encoding_type_url,
),
(
'before-parameter-build.s3.ListObjectsV2',
set_list_objects_encoding_type_url,
),
(
'before-parameter-build.s3.ListObjectVersions',
set_list_objects_encoding_type_url,
),
('before-parameter-build.s3.CopyObject', handle_copy_source_param),
('before-parameter-build.s3.UploadPartCopy', handle_copy_source_param),
('before-parameter-build.s3.CopyObject', validate_ascii_metadata),
('before-parameter-build.s3.PutObject', validate_ascii_metadata),
(
'before-parameter-build.s3.CreateMultipartUpload',
validate_ascii_metadata,
),
('before-parameter-build.s3-control', remove_accid_host_prefix_from_model),
('docs.*.s3.CopyObject.complete-section', document_copy_source_form),
('docs.*.s3.UploadPartCopy.complete-section', document_copy_source_form),
('before-endpoint-resolution.s3', customize_endpoint_resolver_builtins),
('before-call', add_recursion_detection_header),
('before-call.s3', add_expect_header),
('before-call.glacier', add_glacier_version),
('before-call.apigateway', add_accept_header),
('before-call.s3.PutObject', conditionally_calculate_checksum),
('before-call.s3.UploadPart', conditionally_calculate_md5),
('before-call.s3.DeleteObjects', escape_xml_payload),
('before-call.s3.DeleteObjects', conditionally_calculate_checksum),
('before-call.s3.PutBucketLifecycleConfiguration', escape_xml_payload),
('before-call.glacier.UploadArchive', add_glacier_checksums),
('before-call.glacier.UploadMultipartPart', add_glacier_checksums),
('before-call.ec2.CopySnapshot', inject_presigned_url_ec2),
('request-created', add_retry_headers),
('request-created.machinelearning.Predict', switch_host_machinelearning),
('needs-retry.s3.UploadPartCopy', check_for_200_error, REGISTER_FIRST),
('needs-retry.s3.CopyObject', check_for_200_error, REGISTER_FIRST),
(
'needs-retry.s3.CompleteMultipartUpload',
check_for_200_error,
REGISTER_FIRST,
),
('choose-signer.cognito-identity.GetId', disable_signing),
('choose-signer.cognito-identity.GetOpenIdToken', disable_signing),
('choose-signer.cognito-identity.UnlinkIdentity', disable_signing),
(
'choose-signer.cognito-identity.GetCredentialsForIdentity',
disable_signing,
),
('choose-signer.sts.AssumeRoleWithSAML', disable_signing),
('choose-signer.sts.AssumeRoleWithWebIdentity', disable_signing),
('choose-signer', set_operation_specific_signer),
('before-parameter-build.s3.HeadObject', sse_md5),
('before-parameter-build.s3.GetObject', sse_md5),
('before-parameter-build.s3.PutObject', sse_md5),
('before-parameter-build.s3.CopyObject', sse_md5),
('before-parameter-build.s3.CopyObject', copy_source_sse_md5),
('before-parameter-build.s3.CreateMultipartUpload', sse_md5),
('before-parameter-build.s3.UploadPart', sse_md5),
('before-parameter-build.s3.UploadPartCopy', sse_md5),
('before-parameter-build.s3.UploadPartCopy', copy_source_sse_md5),
('before-parameter-build.s3.CompleteMultipartUpload', sse_md5),
('before-parameter-build.s3.SelectObjectContent', sse_md5),
('before-parameter-build.ec2.RunInstances', base64_encode_user_data),
(
'before-parameter-build.autoscaling.CreateLaunchConfiguration',
base64_encode_user_data,
),
('before-parameter-build.route53', fix_route53_ids),
('before-parameter-build.glacier', inject_account_id),
('before-sign.s3', remove_arn_from_signing_path),
(
'before-sign.polly.SynthesizeSpeech',
remove_content_type_header_for_presigning,
),
('after-call.s3.ListObjects', decode_list_object),
('after-call.s3.ListObjectsV2', decode_list_object_v2),
('after-call.s3.ListObjectVersions', decode_list_object_versions),
# Cloudsearchdomain search operation will be sent by HTTP POST
('request-created.cloudsearchdomain.Search', change_get_to_post),
# Glacier documentation customizations
(
'docs.*.glacier.*.complete-section',
AutoPopulatedParam(
'accountId',
'Note: this parameter is set to "-" by'
'default if no value is not specified.',
).document_auto_populated_param,
),
(
'docs.*.glacier.UploadArchive.complete-section',
AutoPopulatedParam('checksum').document_auto_populated_param,
),
(
'docs.*.glacier.UploadMultipartPart.complete-section',
AutoPopulatedParam('checksum').document_auto_populated_param,
),
(
'docs.request-params.glacier.CompleteMultipartUpload.complete-section',
document_glacier_tree_hash_checksum(),
),
# Cloudformation documentation customizations
(
'docs.*.cloudformation.GetTemplate.complete-section',
document_cloudformation_get_template_return_type,
),
# UserData base64 encoding documentation customizations
(
'docs.*.ec2.RunInstances.complete-section',
document_base64_encoding('UserData'),
),
(
'docs.*.autoscaling.CreateLaunchConfiguration.complete-section',
document_base64_encoding('UserData'),
),
# EC2 CopySnapshot documentation customizations
(
'docs.*.ec2.CopySnapshot.complete-section',
AutoPopulatedParam('PresignedUrl').document_auto_populated_param,
),
(
'docs.*.ec2.CopySnapshot.complete-section',
AutoPopulatedParam('DestinationRegion').document_auto_populated_param,
),
# S3 SSE documentation modifications
(
'docs.*.s3.*.complete-section',
AutoPopulatedParam('SSECustomerKeyMD5').document_auto_populated_param,
),
# S3 SSE Copy Source documentation modifications
(
'docs.*.s3.*.complete-section',
AutoPopulatedParam(
'CopySourceSSECustomerKeyMD5'
).document_auto_populated_param,
),
# Add base64 information to Lambda
(
'docs.*.lambda.UpdateFunctionCode.complete-section',
document_base64_encoding('ZipFile'),
),
# The following S3 operations cannot actually accept a ContentMD5
(
'docs.*.s3.*.complete-section',
HideParamFromOperations(
's3',
'ContentMD5',
[
'DeleteObjects',
'PutBucketAcl',
'PutBucketCors',
'PutBucketLifecycle',
'PutBucketLogging',
'PutBucketNotification',
'PutBucketPolicy',
'PutBucketReplication',
'PutBucketRequestPayment',
'PutBucketTagging',
'PutBucketVersioning',
'PutBucketWebsite',
'PutObjectAcl',
],
).hide_param,
),
#############
# RDS
#############
('creating-client-class.rds', add_generate_db_auth_token),
('before-call.rds.CopyDBClusterSnapshot', inject_presigned_url_rds),
('before-call.rds.CreateDBCluster', inject_presigned_url_rds),
('before-call.rds.CopyDBSnapshot', inject_presigned_url_rds),
('before-call.rds.CreateDBInstanceReadReplica', inject_presigned_url_rds),
(
'before-call.rds.StartDBInstanceAutomatedBackupsReplication',
inject_presigned_url_rds,
),
# RDS PresignedUrl documentation customizations
(
'docs.*.rds.CopyDBClusterSnapshot.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
(
'docs.*.rds.CreateDBCluster.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
(
'docs.*.rds.CopyDBSnapshot.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
(
'docs.*.rds.CreateDBInstanceReadReplica.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
(
'docs.*.rds.StartDBInstanceAutomatedBackupsReplication.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
#############
# Neptune
#############
('before-call.neptune.CopyDBClusterSnapshot', inject_presigned_url_rds),
('before-call.neptune.CreateDBCluster', inject_presigned_url_rds),
# Neptune PresignedUrl documentation customizations
(
'docs.*.neptune.CopyDBClusterSnapshot.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
(
'docs.*.neptune.CreateDBCluster.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
#############
# DocDB
#############
('before-call.docdb.CopyDBClusterSnapshot', inject_presigned_url_rds),
('before-call.docdb.CreateDBCluster', inject_presigned_url_rds),
# DocDB PresignedUrl documentation customizations
(
'docs.*.docdb.CopyDBClusterSnapshot.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
(
'docs.*.docdb.CreateDBCluster.complete-section',
AutoPopulatedParam('PreSignedUrl').document_auto_populated_param,
),
('before-call', inject_api_version_header_if_needed),
]
_add_parameter_aliases(BUILTIN_HANDLERS)

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