--- a/env/lib/python3.7/site-packages/boto/utils.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1098 +0,0 @@
-# Copyright (c) 2006-2012 Mitch Garnaat http://garnaat.org/
-# Copyright (c) 2010, Eucalyptus Systems, Inc.
-# Copyright (c) 2012 Amazon.com, Inc. or its affiliates.
-# 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.
-
-#
-# Parts of this code were copied or derived from sample code supplied by AWS.
-# The following notice applies to that code.
-#
-#  This software code is made available "AS IS" without warranties of any
-#  kind.  You may copy, display, modify and redistribute the software
-#  code either by itself or as incorporated into your code; provided that
-#  you do not remove any proprietary notices.  Your use of this software
-#  code is at your own risk and you waive any claim against Amazon
-#  Digital Services, Inc. or its affiliates with respect to your use of
-#  this software code. (c) 2006 Amazon Digital Services, Inc. or its
-#  affiliates.
-
-"""
-Some handy utility functions used by several classes.
-"""
-
-import subprocess
-import time
-import logging.handlers
-import boto
-import boto.provider
-import tempfile
-import random
-import smtplib
-import datetime
-import re
-import email.mime.multipart
-import email.mime.base
-import email.mime.text
-import email.utils
-import email.encoders
-import gzip
-import threading
-import locale
-from boto.compat import six, StringIO, urllib, encodebytes
-
-from contextlib import contextmanager
-
-from hashlib import md5, sha512
-_hashfn = sha512
-
-from boto.compat import json
-
-try:
-    from boto.compat.json import JSONDecodeError
-except ImportError:
-    JSONDecodeError = ValueError
-
-# List of Query String Arguments of Interest
-qsa_of_interest = ['acl', 'cors', 'defaultObjectAcl', 'location', 'logging',
-                   'partNumber', 'policy', 'requestPayment', 'torrent',
-                   'versioning', 'versionId', 'versions', 'website',
-                   'uploads', 'uploadId', 'response-content-type',
-                   'response-content-language', 'response-expires',
-                   'response-cache-control', 'response-content-disposition',
-                   'response-content-encoding', 'delete', 'lifecycle',
-                   'tagging', 'restore',
-                   # storageClass is a QSA for buckets in Google Cloud Storage.
-                   # (StorageClass is associated to individual keys in S3, but
-                   # having it listed here should cause no problems because
-                   # GET bucket?storageClass is not part of the S3 API.)
-                   'storageClass',
-                   # websiteConfig is a QSA for buckets in Google Cloud
-                   # Storage.
-                   'websiteConfig',
-                   # compose is a QSA for objects in Google Cloud Storage.
-                   'compose',
-                   # billing is a QSA for buckets in Google Cloud Storage.
-                   'billing',
-                   # userProject is a QSA for requests in Google Cloud Storage.
-                   'userProject',
-                   # encryptionConfig is a QSA for requests in Google Cloud
-                   # Storage.
-                   'encryptionConfig']
-
-
-_first_cap_regex = re.compile('(.)([A-Z][a-z]+)')
-_number_cap_regex = re.compile('([a-z])([0-9]+)')
-_end_cap_regex = re.compile('([a-z0-9])([A-Z])')
-
-
-def unquote_v(nv):
-    if len(nv) == 1:
-        return nv
-    else:
-        return (nv[0], urllib.parse.unquote(nv[1]))
-
-
-def canonical_string(method, path, headers, expires=None,
-                     provider=None):
-    """
-    Generates the aws canonical string for the given parameters
-    """
-    if not provider:
-        provider = boto.provider.get_default()
-    interesting_headers = {}
-    for key in headers:
-        lk = key.lower()
-        if headers[key] is not None and \
-                (lk in ['content-md5', 'content-type', 'date'] or
-                 lk.startswith(provider.header_prefix)):
-            interesting_headers[lk] = str(headers[key]).strip()
-
-    # these keys get empty strings if they don't exist
-    if 'content-type' not in interesting_headers:
-        interesting_headers['content-type'] = ''
-    if 'content-md5' not in interesting_headers:
-        interesting_headers['content-md5'] = ''
-
-    # just in case someone used this.  it's not necessary in this lib.
-    if provider.date_header in interesting_headers:
-        interesting_headers['date'] = ''
-
-    # if you're using expires for query string auth, then it trumps date
-    # (and provider.date_header)
-    if expires:
-        interesting_headers['date'] = str(expires)
-
-    sorted_header_keys = sorted(interesting_headers.keys())
-
-    buf = "%s\n" % method
-    for key in sorted_header_keys:
-        val = interesting_headers[key]
-        if key.startswith(provider.header_prefix):
-            buf += "%s:%s\n" % (key, val)
-        else:
-            buf += "%s\n" % val
-
-    # don't include anything after the first ? in the resource...
-    # unless it is one of the QSA of interest, defined above
-    t = path.split('?')
-    buf += t[0]
-
-    if len(t) > 1:
-        qsa = t[1].split('&')
-        qsa = [a.split('=', 1) for a in qsa]
-        qsa = [unquote_v(a) for a in qsa if a[0] in qsa_of_interest]
-        if len(qsa) > 0:
-            qsa.sort(key=lambda x: x[0])
-            qsa = ['='.join(a) for a in qsa]
-            buf += '?'
-            buf += '&'.join(qsa)
-
-    return buf
-
-
-def merge_meta(headers, metadata, provider=None):
-    if not provider:
-        provider = boto.provider.get_default()
-    metadata_prefix = provider.metadata_prefix
-    final_headers = headers.copy()
-    for k in metadata.keys():
-        if k.lower() in boto.s3.key.Key.base_user_settable_fields:
-            final_headers[k] = metadata[k]
-        else:
-            final_headers[metadata_prefix + k] = metadata[k]
-
-    return final_headers
-
-
-def get_aws_metadata(headers, provider=None):
-    if not provider:
-        provider = boto.provider.get_default()
-    metadata_prefix = provider.metadata_prefix
-    metadata = {}
-    for hkey in headers.keys():
-        if hkey.lower().startswith(metadata_prefix):
-            val = urllib.parse.unquote(headers[hkey])
-            if isinstance(val, bytes):
-                try:
-                    val = val.decode('utf-8')
-                except UnicodeDecodeError:
-                    # Just leave the value as-is
-                    pass
-            metadata[hkey[len(metadata_prefix):]] = val
-            del headers[hkey]
-    return metadata
-
-
-def retry_url(url, retry_on_404=True, num_retries=10, timeout=None):
-    """
-    Retry a url.  This is specifically used for accessing the metadata
-    service on an instance.  Since this address should never be proxied
-    (for security reasons), we create a ProxyHandler with a NULL
-    dictionary to override any proxy settings in the environment.
-    """
-    for i in range(0, num_retries):
-        try:
-            proxy_handler = urllib.request.ProxyHandler({})
-            opener = urllib.request.build_opener(proxy_handler)
-            req = urllib.request.Request(url)
-            r = opener.open(req, timeout=timeout)
-            result = r.read()
-
-            if(not isinstance(result, six.string_types) and
-                    hasattr(result, 'decode')):
-                result = result.decode('utf-8')
-
-            return result
-        except urllib.error.HTTPError as e:
-            code = e.getcode()
-            if code == 404 and not retry_on_404:
-                return ''
-        except Exception as e:
-            boto.log.exception('Caught exception reading instance data')
-        # If not on the last iteration of the loop then sleep.
-        if i + 1 != num_retries:
-            boto.log.debug('Sleeping before retrying')
-            time.sleep(min(2 ** i,
-                           boto.config.get('Boto', 'max_retry_delay', 60)))
-    boto.log.error('Unable to read instance data, giving up')
-    return ''
-
-
-def _get_instance_metadata(url, num_retries, timeout=None):
-    return LazyLoadMetadata(url, num_retries, timeout)
-
-
-class LazyLoadMetadata(dict):
-    def __init__(self, url, num_retries, timeout=None):
-        self._url = url
-        self._num_retries = num_retries
-        self._leaves = {}
-        self._dicts = []
-        self._timeout = timeout
-        data = boto.utils.retry_url(self._url, num_retries=self._num_retries, timeout=self._timeout)
-        if data:
-            fields = data.split('\n')
-            for field in fields:
-                if field.endswith('/'):
-                    key = field[0:-1]
-                    self._dicts.append(key)
-                else:
-                    p = field.find('=')
-                    if p > 0:
-                        key = field[p + 1:]
-                        resource = field[0:p] + '/openssh-key'
-                    else:
-                        key = resource = field
-                    self._leaves[key] = resource
-                self[key] = None
-
-    def _materialize(self):
-        for key in self:
-            self[key]
-
-    def __getitem__(self, key):
-        if key not in self:
-            # allow dict to throw the KeyError
-            return super(LazyLoadMetadata, self).__getitem__(key)
-
-        # already loaded
-        val = super(LazyLoadMetadata, self).__getitem__(key)
-        if val is not None:
-            return val
-
-        if key in self._leaves:
-            resource = self._leaves[key]
-            last_exception = None
-
-            for i in range(0, self._num_retries):
-                try:
-                    val = boto.utils.retry_url(
-                        self._url + urllib.parse.quote(resource,
-                                                       safe="/:"),
-                        num_retries=self._num_retries,
-                        timeout=self._timeout)
-                    if val and val[0] == '{':
-                        val = json.loads(val)
-                        break
-                    else:
-                        p = val.find('\n')
-                        if p > 0:
-                            val = val.split('\n')
-                        break
-
-                except JSONDecodeError as e:
-                    boto.log.debug(
-                        "encountered '%s' exception: %s" % (
-                            e.__class__.__name__, e))
-                    boto.log.debug(
-                        'corrupted JSON data found: %s' % val)
-                    last_exception = e
-
-                except Exception as e:
-                    boto.log.debug("encountered unretryable" +
-                                   " '%s' exception, re-raising" % (
-                                       e.__class__.__name__))
-                    last_exception = e
-                    raise
-
-                boto.log.error("Caught exception reading meta data" +
-                               " for the '%s' try" % (i + 1))
-
-                if i + 1 != self._num_retries:
-                    next_sleep = min(
-                        random.random() * 2 ** i,
-                        boto.config.get('Boto', 'max_retry_delay', 60))
-                    time.sleep(next_sleep)
-            else:
-                boto.log.error('Unable to read meta data, giving up')
-                boto.log.error(
-                    "encountered '%s' exception: %s" % (
-                        last_exception.__class__.__name__, last_exception))
-                raise last_exception
-
-            self[key] = val
-        elif key in self._dicts:
-            self[key] = LazyLoadMetadata(self._url + key + '/',
-                                         self._num_retries)
-
-        return super(LazyLoadMetadata, self).__getitem__(key)
-
-    def get(self, key, default=None):
-        try:
-            return self[key]
-        except KeyError:
-            return default
-
-    def values(self):
-        self._materialize()
-        return super(LazyLoadMetadata, self).values()
-
-    def items(self):
-        self._materialize()
-        return super(LazyLoadMetadata, self).items()
-
-    def __str__(self):
-        self._materialize()
-        return super(LazyLoadMetadata, self).__str__()
-
-    def __repr__(self):
-        self._materialize()
-        return super(LazyLoadMetadata, self).__repr__()
-
-
-def _build_instance_metadata_url(url, version, path):
-    """
-    Builds an EC2 metadata URL for fetching information about an instance.
-
-    Example:
-
-        >>> _build_instance_metadata_url('http://169.254.169.254', 'latest', 'meta-data/')
-        http://169.254.169.254/latest/meta-data/
-
-    :type url: string
-    :param url: URL to metadata service, e.g. 'http://169.254.169.254'
-
-    :type version: string
-    :param version: Version of the metadata to get, e.g. 'latest'
-
-    :type path: string
-    :param path: Path of the metadata to get, e.g. 'meta-data/'. If a trailing
-                 slash is required it must be passed in with the path.
-
-    :return: The full metadata URL
-    """
-    return '%s/%s/%s' % (url, version, path)
-
-
-def get_instance_metadata(version='latest', url='http://169.254.169.254',
-                          data='meta-data/', timeout=None, num_retries=5):
-    """
-    Returns the instance metadata as a nested Python dictionary.
-    Simple values (e.g. local_hostname, hostname, etc.) will be
-    stored as string values.  Values such as ancestor-ami-ids will
-    be stored in the dict as a list of string values.  More complex
-    fields such as public-keys and will be stored as nested dicts.
-
-    If the timeout is specified, the connection to the specified url
-    will time out after the specified number of seconds.
-
-    """
-    try:
-        metadata_url = _build_instance_metadata_url(url, version, data)
-        return _get_instance_metadata(metadata_url, num_retries=num_retries, timeout=timeout)
-    except urllib.error.URLError:
-        boto.log.exception("Exception caught when trying to retrieve "
-                           "instance metadata for: %s", data)
-        return None
-
-
-def get_instance_identity(version='latest', url='http://169.254.169.254',
-                          timeout=None, num_retries=5):
-    """
-    Returns the instance identity as a nested Python dictionary.
-    """
-    iid = {}
-    base_url = _build_instance_metadata_url(url, version,
-                                            'dynamic/instance-identity/')
-    try:
-        data = retry_url(base_url, num_retries=num_retries, timeout=timeout)
-        fields = data.split('\n')
-        for field in fields:
-            val = retry_url(base_url + '/' + field + '/', num_retries=num_retries, timeout=timeout)
-            if val[0] == '{':
-                val = json.loads(val)
-            if field:
-                iid[field] = val
-        return iid
-    except urllib.error.URLError:
-        return None
-
-
-def get_instance_userdata(version='latest', sep=None,
-                          url='http://169.254.169.254', timeout=None, num_retries=5):
-    ud_url = _build_instance_metadata_url(url, version, 'user-data')
-    user_data = retry_url(ud_url, retry_on_404=False, num_retries=num_retries, timeout=timeout)
-    if user_data:
-        if sep:
-            l = user_data.split(sep)
-            user_data = {}
-            for nvpair in l:
-                t = nvpair.split('=')
-                user_data[t[0].strip()] = t[1].strip()
-    return user_data
-
-ISO8601 = '%Y-%m-%dT%H:%M:%SZ'
-ISO8601_MS = '%Y-%m-%dT%H:%M:%S.%fZ'
-RFC1123 = '%a, %d %b %Y %H:%M:%S %Z'
-LOCALE_LOCK = threading.Lock()
-
-
-@contextmanager
-def setlocale(name):
-    """
-    A context manager to set the locale in a threadsafe manner.
-    """
-    with LOCALE_LOCK:
-        saved = locale.setlocale(locale.LC_ALL)
-
-        try:
-            yield locale.setlocale(locale.LC_ALL, name)
-        finally:
-            locale.setlocale(locale.LC_ALL, saved)
-
-
-def get_ts(ts=None):
-    if not ts:
-        ts = time.gmtime()
-    return time.strftime(ISO8601, ts)
-
-
-def parse_ts(ts):
-    with setlocale('C'):
-        ts = ts.strip()
-        try:
-            dt = datetime.datetime.strptime(ts, ISO8601)
-            return dt
-        except ValueError:
-            try:
-                dt = datetime.datetime.strptime(ts, ISO8601_MS)
-                return dt
-            except ValueError:
-                dt = datetime.datetime.strptime(ts, RFC1123)
-                return dt
-
-
-def find_class(module_name, class_name=None):
-    if class_name:
-        module_name = "%s.%s" % (module_name, class_name)
-    modules = module_name.split('.')
-    c = None
-
-    try:
-        for m in modules[1:]:
-            if c:
-                c = getattr(c, m)
-            else:
-                c = getattr(__import__(".".join(modules[0:-1])), m)
-        return c
-    except:
-        return None
-
-
-def update_dme(username, password, dme_id, ip_address):
-    """
-    Update your Dynamic DNS record with DNSMadeEasy.com
-    """
-    dme_url = 'https://www.dnsmadeeasy.com/servlet/updateip'
-    dme_url += '?username=%s&password=%s&id=%s&ip=%s'
-    s = urllib.request.urlopen(dme_url % (username, password, dme_id, ip_address))
-    return s.read()
-
-
-def fetch_file(uri, file=None, username=None, password=None):
-    """
-    Fetch a file based on the URI provided.
-    If you do not pass in a file pointer a tempfile.NamedTemporaryFile,
-    or None if the file could not be retrieved is returned.
-    The URI can be either an HTTP url, or "s3://bucket_name/key_name"
-    """
-    boto.log.info('Fetching %s' % uri)
-    if file is None:
-        file = tempfile.NamedTemporaryFile()
-    try:
-        if uri.startswith('s3://'):
-            bucket_name, key_name = uri[len('s3://'):].split('/', 1)
-            c = boto.connect_s3(aws_access_key_id=username,
-                                aws_secret_access_key=password)
-            bucket = c.get_bucket(bucket_name)
-            key = bucket.get_key(key_name)
-            key.get_contents_to_file(file)
-        else:
-            if username and password:
-                passman = urllib.request.HTTPPasswordMgrWithDefaultRealm()
-                passman.add_password(None, uri, username, password)
-                authhandler = urllib.request.HTTPBasicAuthHandler(passman)
-                opener = urllib.request.build_opener(authhandler)
-                urllib.request.install_opener(opener)
-            s = urllib.request.urlopen(uri)
-            file.write(s.read())
-        file.seek(0)
-    except:
-        raise
-        boto.log.exception('Problem Retrieving file: %s' % uri)
-        file = None
-    return file
-
-
-class ShellCommand(object):
-
-    def __init__(self, command, wait=True, fail_fast=False, cwd=None):
-        self.exit_code = 0
-        self.command = command
-        self.log_fp = StringIO()
-        self.wait = wait
-        self.fail_fast = fail_fast
-        self.run(cwd=cwd)
-
-    def run(self, cwd=None):
-        boto.log.info('running:%s' % self.command)
-        self.process = subprocess.Popen(self.command, shell=True,
-                                        stdin=subprocess.PIPE,
-                                        stdout=subprocess.PIPE,
-                                        stderr=subprocess.PIPE,
-                                        cwd=cwd)
-        if(self.wait):
-            while self.process.poll() is None:
-                time.sleep(1)
-                t = self.process.communicate()
-                self.log_fp.write(t[0])
-                self.log_fp.write(t[1])
-            boto.log.info(self.log_fp.getvalue())
-            self.exit_code = self.process.returncode
-
-            if self.fail_fast and self.exit_code != 0:
-                raise Exception("Command " + self.command +
-                                " failed with status " + self.exit_code)
-
-            return self.exit_code
-
-    def setReadOnly(self, value):
-        raise AttributeError
-
-    def getStatus(self):
-        return self.exit_code
-
-    status = property(getStatus, setReadOnly, None,
-                      'The exit code for the command')
-
-    def getOutput(self):
-        return self.log_fp.getvalue()
-
-    output = property(getOutput, setReadOnly, None,
-                      'The STDIN and STDERR output of the command')
-
-
-class AuthSMTPHandler(logging.handlers.SMTPHandler):
-    """
-    This class extends the SMTPHandler in the standard Python logging module
-    to accept a username and password on the constructor and to then use those
-    credentials to authenticate with the SMTP server.  To use this, you could
-    add something like this in your boto config file:
-
-    [handler_hand07]
-    class=boto.utils.AuthSMTPHandler
-    level=WARN
-    formatter=form07
-    args=('localhost', 'username', 'password', 'from@abc', ['user1@abc', 'user2@xyz'], 'Logger Subject')
-    """
-
-    def __init__(self, mailhost, username, password,
-                 fromaddr, toaddrs, subject):
-        """
-        Initialize the handler.
-
-        We have extended the constructor to accept a username/password
-        for SMTP authentication.
-        """
-        super(AuthSMTPHandler, self).__init__(mailhost, fromaddr,
-                                              toaddrs, subject)
-        self.username = username
-        self.password = password
-
-    def emit(self, record):
-        """
-        Emit a record.
-
-        Format the record and send it to the specified addressees.
-        It would be really nice if I could add authorization to this class
-        without having to resort to cut and paste inheritance but, no.
-        """
-        try:
-            port = self.mailport
-            if not port:
-                port = smtplib.SMTP_PORT
-            smtp = smtplib.SMTP(self.mailhost, port)
-            smtp.login(self.username, self.password)
-            msg = self.format(record)
-            msg = "From: %s\r\nTo: %s\r\nSubject: %s\r\nDate: %s\r\n\r\n%s" % (
-                self.fromaddr,
-                ','.join(self.toaddrs),
-                self.getSubject(record),
-                email.utils.formatdate(), msg)
-            smtp.sendmail(self.fromaddr, self.toaddrs, msg)
-            smtp.quit()
-        except (KeyboardInterrupt, SystemExit):
-            raise
-        except:
-            self.handleError(record)
-
-
-class LRUCache(dict):
-    """A dictionary-like object that stores only a certain number of items, and
-    discards its least recently used item when full.
-
-    >>> cache = LRUCache(3)
-    >>> cache['A'] = 0
-    >>> cache['B'] = 1
-    >>> cache['C'] = 2
-    >>> len(cache)
-    3
-
-    >>> cache['A']
-    0
-
-    Adding new items to the cache does not increase its size. Instead, the least
-    recently used item is dropped:
-
-    >>> cache['D'] = 3
-    >>> len(cache)
-    3
-    >>> 'B' in cache
-    False
-
-    Iterating over the cache returns the keys, starting with the most recently
-    used:
-
-    >>> for key in cache:
-    ...     print key
-    D
-    A
-    C
-
-    This code is based on the LRUCache class from Genshi which is based on
-    `Myghty <http://www.myghty.org>`_'s LRUCache from ``myghtyutils.util``,
-    written by Mike Bayer and released under the MIT license (Genshi uses the
-    BSD License).
-    """
-
-    class _Item(object):
-        def __init__(self, key, value):
-            self.previous = self.next = None
-            self.key = key
-            self.value = value
-
-        def __repr__(self):
-            return repr(self.value)
-
-    def __init__(self, capacity):
-        self._dict = dict()
-        self.capacity = capacity
-        self.head = None
-        self.tail = None
-
-    def __contains__(self, key):
-        return key in self._dict
-
-    def __iter__(self):
-        cur = self.head
-        while cur:
-            yield cur.key
-            cur = cur.next
-
-    def __len__(self):
-        return len(self._dict)
-
-    def __getitem__(self, key):
-        item = self._dict[key]
-        self._update_item(item)
-        return item.value
-
-    def __setitem__(self, key, value):
-        item = self._dict.get(key)
-        if item is None:
-            item = self._Item(key, value)
-            self._dict[key] = item
-            self._insert_item(item)
-        else:
-            item.value = value
-            self._update_item(item)
-            self._manage_size()
-
-    def __repr__(self):
-        return repr(self._dict)
-
-    def _insert_item(self, item):
-        item.previous = None
-        item.next = self.head
-        if self.head is not None:
-            self.head.previous = item
-        else:
-            self.tail = item
-        self.head = item
-        self._manage_size()
-
-    def _manage_size(self):
-        while len(self._dict) > self.capacity:
-            del self._dict[self.tail.key]
-            if self.tail != self.head:
-                self.tail = self.tail.previous
-                self.tail.next = None
-            else:
-                self.head = self.tail = None
-
-    def _update_item(self, item):
-        if self.head == item:
-            return
-
-        previous = item.previous
-        previous.next = item.next
-        if item.next is not None:
-            item.next.previous = previous
-        else:
-            self.tail = previous
-
-        item.previous = None
-        item.next = self.head
-        self.head.previous = self.head = item
-
-
-class Password(object):
-    """
-    Password object that stores itself as hashed.
-    Hash defaults to SHA512 if available, MD5 otherwise.
-    """
-    hashfunc = _hashfn
-
-    def __init__(self, str=None, hashfunc=None):
-        """
-        Load the string from an initial value, this should be the
-        raw hashed password.
-        """
-        self.str = str
-        if hashfunc:
-            self.hashfunc = hashfunc
-
-    def set(self, value):
-        if not isinstance(value, bytes):
-            value = value.encode('utf-8')
-        self.str = self.hashfunc(value).hexdigest()
-
-    def __str__(self):
-        return str(self.str)
-
-    def __eq__(self, other):
-        if other is None:
-            return False
-        if not isinstance(other, bytes):
-            other = other.encode('utf-8')
-        return str(self.hashfunc(other).hexdigest()) == str(self.str)
-
-    def __len__(self):
-        if self.str:
-            return len(self.str)
-        else:
-            return 0
-
-
-def notify(subject, body=None, html_body=None, to_string=None,
-           attachments=None, append_instance_id=True):
-    attachments = attachments or []
-    if append_instance_id:
-        subject = "[%s] %s" % (
-            boto.config.get_value("Instance", "instance-id"), subject)
-    if not to_string:
-        to_string = boto.config.get_value('Notification', 'smtp_to', None)
-    if to_string:
-        try:
-            from_string = boto.config.get_value('Notification',
-                                                'smtp_from', 'boto')
-            msg = email.mime.multipart.MIMEMultipart()
-            msg['From'] = from_string
-            msg['Reply-To'] = from_string
-            msg['To'] = to_string
-            msg['Date'] = email.utils.formatdate(localtime=True)
-            msg['Subject'] = subject
-
-            if body:
-                msg.attach(email.mime.text.MIMEText(body))
-
-            if html_body:
-                part = email.mime.base.MIMEBase('text', 'html')
-                part.set_payload(html_body)
-                email.encoders.encode_base64(part)
-                msg.attach(part)
-
-            for part in attachments:
-                msg.attach(part)
-
-            smtp_host = boto.config.get_value('Notification',
-                                              'smtp_host', 'localhost')
-
-            # Alternate port support
-            if boto.config.get_value("Notification", "smtp_port"):
-                server = smtplib.SMTP(smtp_host, int(
-                    boto.config.get_value("Notification", "smtp_port")))
-            else:
-                server = smtplib.SMTP(smtp_host)
-
-            # TLS support
-            if boto.config.getbool("Notification", "smtp_tls"):
-                server.ehlo()
-                server.starttls()
-                server.ehlo()
-            smtp_user = boto.config.get_value('Notification', 'smtp_user', '')
-            smtp_pass = boto.config.get_value('Notification', 'smtp_pass', '')
-            if smtp_user:
-                server.login(smtp_user, smtp_pass)
-            server.sendmail(from_string, to_string, msg.as_string())
-            server.quit()
-        except:
-            boto.log.exception('notify failed')
-
-
-def get_utf8_value(value):
-    if not six.PY2 and isinstance(value, bytes):
-        return value
-
-    if not isinstance(value, six.string_types):
-        value = six.text_type(value)
-
-    if isinstance(value, six.text_type):
-        value = value.encode('utf-8')
-
-    return value
-
-
-def mklist(value):
-    if not isinstance(value, list):
-        if isinstance(value, tuple):
-            value = list(value)
-        else:
-            value = [value]
-    return value
-
-
-def pythonize_name(name):
-    """Convert camel case to a "pythonic" name.
-
-    Examples::
-
-        pythonize_name('CamelCase') -> 'camel_case'
-        pythonize_name('already_pythonized') -> 'already_pythonized'
-        pythonize_name('HTTPRequest') -> 'http_request'
-        pythonize_name('HTTPStatus200Ok') -> 'http_status_200_ok'
-        pythonize_name('UPPER') -> 'upper'
-        pythonize_name('') -> ''
-
-    """
-    s1 = _first_cap_regex.sub(r'\1_\2', name)
-    s2 = _number_cap_regex.sub(r'\1_\2', s1)
-    return _end_cap_regex.sub(r'\1_\2', s2).lower()
-
-
-def write_mime_multipart(content, compress=False, deftype='text/plain', delimiter=':'):
-    """Description:
-    :param content: A list of tuples of name-content pairs. This is used
-    instead of a dict to ensure that scripts run in order
-    :type list of tuples:
-
-    :param compress: Use gzip to compress the scripts, defaults to no compression
-    :type bool:
-
-    :param deftype: The type that should be assumed if nothing else can be figured out
-    :type str:
-
-    :param delimiter: mime delimiter
-    :type str:
-
-    :return: Final mime multipart
-    :rtype: str:
-    """
-    wrapper = email.mime.multipart.MIMEMultipart()
-    for name, con in content:
-        definite_type = guess_mime_type(con, deftype)
-        maintype, subtype = definite_type.split('/', 1)
-        if maintype == 'text':
-            mime_con = email.mime.text.MIMEText(con, _subtype=subtype)
-        else:
-            mime_con = email.mime.base.MIMEBase(maintype, subtype)
-            mime_con.set_payload(con)
-            # Encode the payload using Base64
-            email.encoders.encode_base64(mime_con)
-        mime_con.add_header('Content-Disposition', 'attachment', filename=name)
-        wrapper.attach(mime_con)
-    rcontent = wrapper.as_string()
-
-    if compress:
-        buf = StringIO()
-        gz = gzip.GzipFile(mode='wb', fileobj=buf)
-        try:
-            gz.write(rcontent)
-        finally:
-            gz.close()
-        rcontent = buf.getvalue()
-
-    return rcontent
-
-
-def guess_mime_type(content, deftype):
-    """Description: Guess the mime type of a block of text
-    :param content: content we're finding the type of
-    :type str:
-
-    :param deftype: Default mime type
-    :type str:
-
-    :rtype: <type>:
-    :return: <description>
-    """
-    # Mappings recognized by cloudinit
-    starts_with_mappings = {
-        '#include': 'text/x-include-url',
-        '#!': 'text/x-shellscript',
-        '#cloud-config': 'text/cloud-config',
-        '#upstart-job': 'text/upstart-job',
-        '#part-handler': 'text/part-handler',
-        '#cloud-boothook': 'text/cloud-boothook'
-    }
-    rtype = deftype
-    for possible_type, mimetype in starts_with_mappings.items():
-        if content.startswith(possible_type):
-            rtype = mimetype
-            break
-    return(rtype)
-
-
-def compute_md5(fp, buf_size=8192, size=None):
-    """
-    Compute MD5 hash on passed file and return results in a tuple of values.
-
-    :type fp: file
-    :param fp: File pointer to the file to MD5 hash.  The file pointer
-               will be reset to its current location before the
-               method returns.
-
-    :type buf_size: integer
-    :param buf_size: Number of bytes per read request.
-
-    :type size: int
-    :param size: (optional) The Maximum number of bytes to read from
-                 the file pointer (fp). This is useful when uploading
-                 a file in multiple parts where the file is being
-                 split inplace into different parts. Less bytes may
-                 be available.
-
-    :rtype: tuple
-    :return: A tuple containing the hex digest version of the MD5 hash
-             as the first element, the base64 encoded version of the
-             plain digest as the second element and the data size as
-             the third element.
-    """
-    return compute_hash(fp, buf_size, size, hash_algorithm=md5)
-
-
-def compute_hash(fp, buf_size=8192, size=None, hash_algorithm=md5):
-    hash_obj = hash_algorithm()
-    spos = fp.tell()
-    if size and size < buf_size:
-        s = fp.read(size)
-    else:
-        s = fp.read(buf_size)
-    while s:
-        if not isinstance(s, bytes):
-            s = s.encode('utf-8')
-        hash_obj.update(s)
-        if size:
-            size -= len(s)
-            if size <= 0:
-                break
-        if size and size < buf_size:
-            s = fp.read(size)
-        else:
-            s = fp.read(buf_size)
-    hex_digest = hash_obj.hexdigest()
-    base64_digest = encodebytes(hash_obj.digest()).decode('utf-8')
-    if base64_digest[-1] == '\n':
-        base64_digest = base64_digest[0:-1]
-    # data_size based on bytes read.
-    data_size = fp.tell() - spos
-    fp.seek(spos)
-    return (hex_digest, base64_digest, data_size)
-
-
-def find_matching_headers(name, headers):
-    """
-    Takes a specific header name and a dict of headers {"name": "value"}.
-    Returns a list of matching header names, case-insensitive.
-
-    """
-    return [h for h in headers if h.lower() == name.lower()]
-
-
-def merge_headers_by_name(name, headers):
-    """
-    Takes a specific header name and a dict of headers {"name": "value"}.
-    Returns a string of all header values, comma-separated, that match the
-    input header name, case-insensitive.
-
-    """
-    matching_headers = find_matching_headers(name, headers)
-    return ','.join(str(headers[h]) for h in matching_headers
-                    if headers[h] is not None)
-
-
-class RequestHook(object):
-    """
-    This can be extended and supplied to the connection object
-    to gain access to request and response object after the request completes.
-    One use for this would be to implement some specific request logging.
-    """
-    def handle_request_data(self, request, response, error=False):
-        pass
-
-
-def host_is_ipv6(hostname):
-    """
-    Detect (naively) if the hostname is an IPV6 host.
-    Return a boolean.
-    """
-    # empty strings or anything that is not a string is automatically not an
-    # IPV6 address
-    if not hostname or not isinstance(hostname, str):
-        return False
-
-    if hostname.startswith('['):
-        return True
-
-    if len(hostname.split(':')) > 2:
-        return True
-
-    # Anything else that doesn't start with brackets or doesn't have more than
-    # one ':' should not be an IPV6 address. This is very naive but the rest of
-    # the connection chain should error accordingly for typos or ill formed
-    # addresses
-    return False
-
-
-def parse_host(hostname):
-    """
-    Given a hostname that may have a port name, ensure that the port is trimmed
-    returning only the host, including hostnames that are IPV6 and may include
-    brackets.
-    """
-    # ensure that hostname does not have any whitespaces
-    hostname = hostname.strip()
-
-    if host_is_ipv6(hostname):
-        return hostname.split(']:', 1)[0].strip('[]')
-    else:
-        return hostname.split(':', 1)[0]