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# coding=utf-8
# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
from typing import Mapping
def parse_connection_string(conn_str: str, case_sensitive_keys: bool = False) -> Mapping[str, str]:
"""Parses the connection string into a dict of its component parts, with the option of preserving case
of keys, and validates that each key in the connection string has a provided value. If case of keys
is not preserved (ie. `case_sensitive_keys=False`), then a dict with LOWERCASE KEYS will be returned.
:param str conn_str: String with connection details provided by Azure services.
:param bool case_sensitive_keys: Indicates whether the casing of the keys will be preserved. When `False`(the
default), all keys will be lower-cased. If set to `True`, the original casing of the keys will be preserved.
:rtype: Mapping
:returns: Dict of connection string key/value pairs.
:raises:
ValueError: if each key in conn_str does not have a corresponding value and
for other bad formatting of connection strings - including duplicate
args, bad syntax, etc.
"""
cs_args = [s.split("=", 1) for s in conn_str.strip().rstrip(";").split(";")]
if any(len(tup) != 2 or not all(tup) for tup in cs_args):
raise ValueError("Connection string is either blank or malformed.")
args_dict = dict(cs_args)
if len(cs_args) != len(args_dict):
raise ValueError("Connection string is either blank or malformed.")
if not case_sensitive_keys:
# if duplicate case insensitive keys are passed in, raise error
new_args_dict = {}
for key in args_dict.keys(): # pylint: disable=consider-using-dict-items
new_key = key.lower()
if new_key in new_args_dict:
raise ValueError("Duplicate key in connection string: {}".format(new_key))
new_args_dict[new_key] = args_dict[key]
return new_args_dict
return args_dict