--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/boto/s3/connection.py	Sat May 02 07:14:21 2020 -0400
@@ -0,0 +1,672 @@
+# Copyright (c) 2006-2012 Mitch Garnaat http://garnaat.org/
+# Copyright (c) 2012 Amazon.com, Inc. or its affiliates.
+# Copyright (c) 2010, Eucalyptus Systems, Inc.
+# All rights reserved.
+#
+# 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 xml.sax
+import base64
+from boto.compat import six, urllib
+import time
+
+from boto.auth import detect_potential_s3sigv4
+import boto.utils
+from boto.connection import AWSAuthConnection
+from boto import handler
+from boto.s3.bucket import Bucket
+from boto.s3.key import Key
+from boto.resultset import ResultSet
+from boto.exception import BotoClientError, S3ResponseError
+
+
+def check_lowercase_bucketname(n):
+    """
+    Bucket names must not contain uppercase characters. We check for
+    this by appending a lowercase character and testing with islower().
+    Note this also covers cases like numeric bucket names with dashes.
+
+    >>> check_lowercase_bucketname("Aaaa")
+    Traceback (most recent call last):
+    ...
+    BotoClientError: S3Error: Bucket names cannot contain upper-case
+    characters when using either the sub-domain or virtual hosting calling
+    format.
+
+    >>> check_lowercase_bucketname("1234-5678-9123")
+    True
+    >>> check_lowercase_bucketname("abcdefg1234")
+    True
+    """
+    if not (n + 'a').islower():
+        raise BotoClientError("Bucket names cannot contain upper-case " \
+            "characters when using either the sub-domain or virtual " \
+            "hosting calling format.")
+    return True
+
+
+def assert_case_insensitive(f):
+    def wrapper(*args, **kwargs):
+        if len(args) == 3 and check_lowercase_bucketname(args[2]):
+            pass
+        return f(*args, **kwargs)
+    return wrapper
+
+
+class _CallingFormat(object):
+
+    def get_bucket_server(self, server, bucket):
+        return ''
+
+    def build_url_base(self, connection, protocol, server, bucket, key=''):
+        url_base = '%s://' % protocol
+        url_base += self.build_host(server, bucket)
+        url_base += connection.get_path(self.build_path_base(bucket, key))
+        return url_base
+
+    def build_host(self, server, bucket):
+        if bucket == '':
+            return server
+        else:
+            return self.get_bucket_server(server, bucket)
+
+    def build_auth_path(self, bucket, key=''):
+        key = boto.utils.get_utf8_value(key)
+        path = ''
+        if bucket != '':
+            path = '/' + bucket
+        return path + '/%s' % urllib.parse.quote(key)
+
+    def build_path_base(self, bucket, key=''):
+        key = boto.utils.get_utf8_value(key)
+        return '/%s' % urllib.parse.quote(key)
+
+
+class SubdomainCallingFormat(_CallingFormat):
+
+    @assert_case_insensitive
+    def get_bucket_server(self, server, bucket):
+        return '%s.%s' % (bucket, server)
+
+
+class VHostCallingFormat(_CallingFormat):
+
+    @assert_case_insensitive
+    def get_bucket_server(self, server, bucket):
+        return bucket
+
+
+class OrdinaryCallingFormat(_CallingFormat):
+
+    def get_bucket_server(self, server, bucket):
+        return server
+
+    def build_path_base(self, bucket, key=''):
+        key = boto.utils.get_utf8_value(key)
+        path_base = '/'
+        if bucket:
+            path_base += "%s/" % bucket
+        return path_base + urllib.parse.quote(key)
+
+
+class ProtocolIndependentOrdinaryCallingFormat(OrdinaryCallingFormat):
+
+    def build_url_base(self, connection, protocol, server, bucket, key=''):
+        url_base = '//'
+        url_base += self.build_host(server, bucket)
+        url_base += connection.get_path(self.build_path_base(bucket, key))
+        return url_base
+
+
+class Location(object):
+
+    DEFAULT = ''  # US Classic Region
+    EU = 'EU'  # Ireland
+    EUCentral1 = 'eu-central-1'  # Frankfurt
+    USWest = 'us-west-1'
+    USWest2 = 'us-west-2'
+    SAEast = 'sa-east-1'
+    APNortheast = 'ap-northeast-1'
+    APSoutheast = 'ap-southeast-1'
+    APSoutheast2 = 'ap-southeast-2'
+    CNNorth1 = 'cn-north-1'
+
+
+class NoHostProvided(object):
+    # An identifying object to help determine whether the user provided a
+    # ``host`` or not. Never instantiated.
+    pass
+
+
+class HostRequiredError(BotoClientError):
+    pass
+
+
+class S3Connection(AWSAuthConnection):
+
+    DefaultHost = 's3.amazonaws.com'
+    DefaultCallingFormat = boto.config.get('s3', 'calling_format', 'boto.s3.connection.SubdomainCallingFormat')
+    QueryString = 'Signature=%s&Expires=%d&AWSAccessKeyId=%s'
+
+    def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
+                 is_secure=True, port=None, proxy=None, proxy_port=None,
+                 proxy_user=None, proxy_pass=None,
+                 host=NoHostProvided, debug=0, https_connection_factory=None,
+                 calling_format=DefaultCallingFormat, path='/',
+                 provider='aws', bucket_class=Bucket, security_token=None,
+                 suppress_consec_slashes=True, anon=False,
+                 validate_certs=None, profile_name=None):
+        no_host_provided = False
+        # Try falling back to the boto config file's value, if present.
+        if host is NoHostProvided:
+            host = boto.config.get('s3', 'host')
+            if host is None:
+                host = self.DefaultHost
+                no_host_provided = True
+        if isinstance(calling_format, six.string_types):
+            calling_format=boto.utils.find_class(calling_format)()
+        self.calling_format = calling_format
+        self.bucket_class = bucket_class
+        self.anon = anon
+        super(S3Connection, self).__init__(host,
+                aws_access_key_id, aws_secret_access_key,
+                is_secure, port, proxy, proxy_port, proxy_user, proxy_pass,
+                debug=debug, https_connection_factory=https_connection_factory,
+                path=path, provider=provider, security_token=security_token,
+                suppress_consec_slashes=suppress_consec_slashes,
+                validate_certs=validate_certs, profile_name=profile_name)
+        # We need to delay until after the call to ``super`` before checking
+        # to see if SigV4 is in use.
+        if no_host_provided:
+            if 'hmac-v4-s3' in self._required_auth_capability():
+                raise HostRequiredError(
+                    "When using SigV4, you must specify a 'host' parameter."
+                )
+
+    @detect_potential_s3sigv4
+    def _required_auth_capability(self):
+        if self.anon:
+            return ['anon']
+        else:
+            return ['s3']
+
+    def __iter__(self):
+        for bucket in self.get_all_buckets():
+            yield bucket
+
+    def __contains__(self, bucket_name):
+        return not (self.lookup(bucket_name) is None)
+
+    def set_bucket_class(self, bucket_class):
+        """
+        Set the Bucket class associated with this bucket.  By default, this
+        would be the boto.s3.key.Bucket class but if you want to subclass that
+        for some reason this allows you to associate your new class.
+
+        :type bucket_class: class
+        :param bucket_class: A subclass of Bucket that can be more specific
+        """
+        self.bucket_class = bucket_class
+
+    def build_post_policy(self, expiration_time, conditions):
+        """
+        Taken from the AWS book Python examples and modified for use with boto
+        """
+        assert isinstance(expiration_time, time.struct_time), \
+            'Policy document must include a valid expiration Time object'
+
+        # Convert conditions object mappings to condition statements
+
+        return '{"expiration": "%s",\n"conditions": [%s]}' % \
+            (time.strftime(boto.utils.ISO8601, expiration_time), ",".join(conditions))
+
+    def build_post_form_args(self, bucket_name, key, expires_in=6000,
+                             acl=None, success_action_redirect=None,
+                             max_content_length=None,
+                             http_method='http', fields=None,
+                             conditions=None, storage_class='STANDARD',
+                             server_side_encryption=None):
+        """
+        Taken from the AWS book Python examples and modified for use with boto
+        This only returns the arguments required for the post form, not the
+        actual form.  This does not return the file input field which also
+        needs to be added
+
+        :type bucket_name: string
+        :param bucket_name: Bucket to submit to
+
+        :type key: string
+        :param key:  Key name, optionally add ${filename} to the end to
+            attach the submitted filename
+
+        :type expires_in: integer
+        :param expires_in: Time (in seconds) before this expires, defaults
+            to 6000
+
+        :type acl: string
+        :param acl: A canned ACL.  One of:
+            * private
+            * public-read
+            * public-read-write
+            * authenticated-read
+            * bucket-owner-read
+            * bucket-owner-full-control
+
+        :type success_action_redirect: string
+        :param success_action_redirect: URL to redirect to on success
+
+        :type max_content_length: integer
+        :param max_content_length: Maximum size for this file
+
+        :type http_method: string
+        :param http_method:  HTTP Method to use, "http" or "https"
+
+        :type storage_class: string
+        :param storage_class: Storage class to use for storing the object.
+            Valid values: STANDARD | REDUCED_REDUNDANCY
+
+        :type server_side_encryption: string
+        :param server_side_encryption: Specifies server-side encryption
+            algorithm to use when Amazon S3 creates an object.
+            Valid values: None | AES256
+
+        :rtype: dict
+        :return: A dictionary containing field names/values as well as
+            a url to POST to
+
+            .. code-block:: python
+
+
+        """
+        if fields is None:
+            fields = []
+        if conditions is None:
+            conditions = []
+        expiration = time.gmtime(int(time.time() + expires_in))
+
+        # Generate policy document
+        conditions.append('{"bucket": "%s"}' % bucket_name)
+        if key.endswith("${filename}"):
+            conditions.append('["starts-with", "$key", "%s"]' % key[:-len("${filename}")])
+        else:
+            conditions.append('{"key": "%s"}' % key)
+        if acl:
+            conditions.append('{"acl": "%s"}' % acl)
+            fields.append({"name": "acl", "value": acl})
+        if success_action_redirect:
+            conditions.append('{"success_action_redirect": "%s"}' % success_action_redirect)
+            fields.append({"name": "success_action_redirect", "value": success_action_redirect})
+        if max_content_length:
+            conditions.append('["content-length-range", 0, %i]' % max_content_length)
+
+        if self.provider.security_token:
+            fields.append({'name': 'x-amz-security-token',
+                           'value': self.provider.security_token})
+            conditions.append('{"x-amz-security-token": "%s"}' % self.provider.security_token)
+
+        if storage_class:
+            fields.append({'name': 'x-amz-storage-class',
+                           'value': storage_class})
+            conditions.append('{"x-amz-storage-class": "%s"}' % storage_class)
+
+        if server_side_encryption:
+            fields.append({'name': 'x-amz-server-side-encryption',
+                           'value': server_side_encryption})
+            conditions.append('{"x-amz-server-side-encryption": "%s"}' % server_side_encryption)
+
+        policy = self.build_post_policy(expiration, conditions)
+
+        # Add the base64-encoded policy document as the 'policy' field
+        policy_b64 = base64.b64encode(policy)
+        fields.append({"name": "policy", "value": policy_b64})
+
+        # Add the AWS access key as the 'AWSAccessKeyId' field
+        fields.append({"name": "AWSAccessKeyId",
+                       "value": self.aws_access_key_id})
+
+        # Add signature for encoded policy document as the
+        # 'signature' field
+        signature = self._auth_handler.sign_string(policy_b64)
+        fields.append({"name": "signature", "value": signature})
+        fields.append({"name": "key", "value": key})
+
+        # HTTPS protocol will be used if the secure HTTP option is enabled.
+        url = '%s://%s/' % (http_method,
+                            self.calling_format.build_host(self.server_name(),
+                                                           bucket_name))
+
+        return {"action": url, "fields": fields}
+
+    def generate_url_sigv4(self, expires_in, method, bucket='', key='',
+                            headers=None, force_http=False,
+                            response_headers=None, version_id=None,
+                            iso_date=None):
+        path = self.calling_format.build_path_base(bucket, key)
+        auth_path = self.calling_format.build_auth_path(bucket, key)
+        host = self.calling_format.build_host(self.server_name(), bucket)
+
+        # For presigned URLs we should ignore the port if it's HTTPS
+        if host.endswith(':443'):
+            host = host[:-4]
+
+        params = {}
+        if version_id is not None:
+            params['VersionId'] = version_id
+
+        if response_headers is not None:
+            params.update(response_headers)
+
+        http_request = self.build_base_http_request(method, path, auth_path,
+                                                    headers=headers, host=host,
+                                                    params=params)
+
+        return self._auth_handler.presign(http_request, expires_in,
+                                          iso_date=iso_date)
+
+    def generate_url(self, expires_in, method, bucket='', key='', headers=None,
+                     query_auth=True, force_http=False, response_headers=None,
+                     expires_in_absolute=False, version_id=None):
+        if self._auth_handler.capability[0] == 'hmac-v4-s3' and query_auth:
+            # Handle the special sigv4 case
+            return self.generate_url_sigv4(expires_in, method, bucket=bucket,
+                key=key, headers=headers, force_http=force_http,
+                response_headers=response_headers, version_id=version_id)
+
+        headers = headers or {}
+        if expires_in_absolute:
+            expires = int(expires_in)
+        else:
+            expires = int(time.time() + expires_in)
+        auth_path = self.calling_format.build_auth_path(bucket, key)
+        auth_path = self.get_path(auth_path)
+        # optional version_id and response_headers need to be added to
+        # the query param list.
+        extra_qp = []
+        if version_id is not None:
+            extra_qp.append("versionId=%s" % version_id)
+        if response_headers:
+            for k, v in response_headers.items():
+                extra_qp.append("%s=%s" % (k, urllib.parse.quote(v)))
+        if self.provider.security_token:
+            headers['x-amz-security-token'] = self.provider.security_token
+        if extra_qp:
+            delimiter = '?' if '?' not in auth_path else '&'
+            auth_path += delimiter + '&'.join(extra_qp)
+        self.calling_format.build_path_base(bucket, key)
+        if query_auth and not self.anon:
+            c_string = boto.utils.canonical_string(method, auth_path, headers,
+                                                   expires, self.provider)
+            b64_hmac = self._auth_handler.sign_string(c_string)
+            encoded_canonical = urllib.parse.quote(b64_hmac, safe='')
+            query_part = '?' + self.QueryString % (encoded_canonical, expires,
+                                                   self.aws_access_key_id)
+        else:
+            query_part = ''
+        if headers:
+            hdr_prefix = self.provider.header_prefix
+            for k, v in headers.items():
+                if k.startswith(hdr_prefix):
+                    # headers used for sig generation must be
+                    # included in the url also.
+                    extra_qp.append("%s=%s" % (k, urllib.parse.quote(v)))
+        if extra_qp:
+            delimiter = '?' if not query_part else '&'
+            query_part += delimiter + '&'.join(extra_qp)
+        if force_http:
+            protocol = 'http'
+            port = 80
+        else:
+            protocol = self.protocol
+            port = self.port
+        return self.calling_format.build_url_base(self, protocol,
+                                                  self.server_name(port),
+                                                  bucket, key) + query_part
+
+    def get_all_buckets(self, headers=None):
+        response = self.make_request('GET', headers=headers)
+        body = response.read()
+        if response.status > 300:
+            raise self.provider.storage_response_error(
+                response.status, response.reason, body)
+        rs = ResultSet([('Bucket', self.bucket_class)])
+        h = handler.XmlHandler(rs, self)
+        if not isinstance(body, bytes):
+            body = body.encode('utf-8')
+        xml.sax.parseString(body, h)
+        return rs
+
+    def get_canonical_user_id(self, headers=None):
+        """
+        Convenience method that returns the "CanonicalUserID" of the
+        user who's credentials are associated with the connection.
+        The only way to get this value is to do a GET request on the
+        service which returns all buckets associated with the account.
+        As part of that response, the canonical userid is returned.
+        This method simply does all of that and then returns just the
+        user id.
+
+        :rtype: string
+        :return: A string containing the canonical user id.
+        """
+        rs = self.get_all_buckets(headers=headers)
+        return rs.owner.id
+
+    def get_bucket(self, bucket_name, validate=True, headers=None):
+        """
+        Retrieves a bucket by name.
+
+        If the bucket does not exist, an ``S3ResponseError`` will be raised. If
+        you are unsure if the bucket exists or not, you can use the
+        ``S3Connection.lookup`` method, which will either return a valid bucket
+        or ``None``.
+
+        If ``validate=False`` is passed, no request is made to the service (no
+        charge/communication delay). This is only safe to do if you are **sure**
+        the bucket exists.
+
+        If the default ``validate=True`` is passed, a request is made to the
+        service to ensure the bucket exists. Prior to Boto v2.25.0, this fetched
+        a list of keys (but with a max limit set to ``0``, always returning an empty
+        list) in the bucket (& included better error messages), at an
+        increased expense. As of Boto v2.25.0, this now performs a HEAD request
+        (less expensive but worse error messages).
+
+        If you were relying on parsing the error message before, you should call
+        something like::
+
+            bucket = conn.get_bucket('<bucket_name>', validate=False)
+            bucket.get_all_keys(maxkeys=0)
+
+        :type bucket_name: string
+        :param bucket_name: The name of the bucket
+
+        :type headers: dict
+        :param headers: Additional headers to pass along with the request to
+            AWS.
+
+        :type validate: boolean
+        :param validate: If ``True``, it will try to verify the bucket exists
+            on the service-side. (Default: ``True``)
+        """
+        if validate:
+            return self.head_bucket(bucket_name, headers=headers)
+        else:
+            return self.bucket_class(self, bucket_name)
+
+    def head_bucket(self, bucket_name, headers=None):
+        """
+        Determines if a bucket exists by name.
+
+        If the bucket does not exist, an ``S3ResponseError`` will be raised.
+
+        :type bucket_name: string
+        :param bucket_name: The name of the bucket
+
+        :type headers: dict
+        :param headers: Additional headers to pass along with the request to
+            AWS.
+
+        :returns: A <Bucket> object
+        """
+        response = self.make_request('HEAD', bucket_name, headers=headers)
+        body = response.read()
+        if response.status == 200:
+            return self.bucket_class(self, bucket_name)
+        elif response.status == 403:
+            # For backward-compatibility, we'll populate part of the exception
+            # with the most-common default.
+            err = self.provider.storage_response_error(
+                response.status,
+                response.reason,
+                body
+            )
+            err.error_code = 'AccessDenied'
+            err.error_message = 'Access Denied'
+            raise err
+        elif response.status == 404:
+            # For backward-compatibility, we'll populate part of the exception
+            # with the most-common default.
+            err = self.provider.storage_response_error(
+                response.status,
+                response.reason,
+                body
+            )
+            err.error_code = 'NoSuchBucket'
+            err.error_message = 'The specified bucket does not exist'
+            raise err
+        else:
+            raise self.provider.storage_response_error(
+                response.status, response.reason, body)
+
+    def lookup(self, bucket_name, validate=True, headers=None):
+        """
+        Attempts to get a bucket from S3.
+
+        Works identically to ``S3Connection.get_bucket``, save for that it
+        will return ``None`` if the bucket does not exist instead of throwing
+        an exception.
+
+        :type bucket_name: string
+        :param bucket_name: The name of the bucket
+
+        :type headers: dict
+        :param headers: Additional headers to pass along with the request to
+            AWS.
+
+        :type validate: boolean
+        :param validate: If ``True``, it will try to fetch all keys within the
+            given bucket. (Default: ``True``)
+        """
+        try:
+            bucket = self.get_bucket(bucket_name, validate, headers=headers)
+        except:
+            bucket = None
+        return bucket
+
+    def create_bucket(self, bucket_name, headers=None,
+                      location=Location.DEFAULT, policy=None):
+        """
+        Creates a new located bucket. By default it's in the USA. You can pass
+        Location.EU to create a European bucket (S3) or European Union bucket
+        (GCS).
+
+        :type bucket_name: string
+        :param bucket_name: The name of the new bucket
+
+        :type headers: dict
+        :param headers: Additional headers to pass along with the request to AWS.
+
+        :type location: str
+        :param location: The location of the new bucket.  You can use one of the
+            constants in :class:`boto.s3.connection.Location` (e.g. Location.EU,
+            Location.USWest, etc.).
+
+        :type policy: :class:`boto.s3.acl.CannedACLStrings`
+        :param policy: A canned ACL policy that will be applied to the
+            new key in S3.
+
+        """
+        check_lowercase_bucketname(bucket_name)
+
+        if policy:
+            if headers:
+                headers[self.provider.acl_header] = policy
+            else:
+                headers = {self.provider.acl_header: policy}
+        if location == Location.DEFAULT:
+            data = ''
+        else:
+            data = '<CreateBucketConfiguration><LocationConstraint>' + \
+                    location + '</LocationConstraint></CreateBucketConfiguration>'
+        response = self.make_request('PUT', bucket_name, headers=headers,
+                data=data)
+        body = response.read()
+        if response.status == 409:
+            raise self.provider.storage_create_error(
+                response.status, response.reason, body)
+        if response.status == 200:
+            return self.bucket_class(self, bucket_name)
+        else:
+            raise self.provider.storage_response_error(
+                response.status, response.reason, body)
+
+    def delete_bucket(self, bucket, headers=None):
+        """
+        Removes an S3 bucket.
+
+        In order to remove the bucket, it must first be empty. If the bucket is
+        not empty, an ``S3ResponseError`` will be raised.
+
+        :type bucket_name: string
+        :param bucket_name: The name of the bucket
+
+        :type headers: dict
+        :param headers: Additional headers to pass along with the request to
+            AWS.
+        """
+        response = self.make_request('DELETE', bucket, headers=headers)
+        body = response.read()
+        if response.status != 204:
+            raise self.provider.storage_response_error(
+                response.status, response.reason, body)
+
+    def make_request(self, method, bucket='', key='', headers=None, data='',
+                     query_args=None, sender=None, override_num_retries=None,
+                     retry_handler=None):
+        if isinstance(bucket, self.bucket_class):
+            bucket = bucket.name
+        if isinstance(key, Key):
+            key = key.name
+        path = self.calling_format.build_path_base(bucket, key)
+        boto.log.debug('path=%s' % path)
+        auth_path = self.calling_format.build_auth_path(bucket, key)
+        boto.log.debug('auth_path=%s' % auth_path)
+        host = self.calling_format.build_host(self.server_name(), bucket)
+        if query_args:
+            path += '?' + query_args
+            boto.log.debug('path=%s' % path)
+            auth_path += '?' + query_args
+            boto.log.debug('auth_path=%s' % auth_path)
+        return super(S3Connection, self).make_request(
+            method, path, headers,
+            data, host, auth_path, sender,
+            override_num_retries=override_num_retries,
+            retry_handler=retry_handler
+        )