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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.
# --------------------------------------------------------------------------
import base64
from json import JSONEncoder
from typing import Union, cast, Any
from datetime import datetime, date, time, timedelta
from datetime import timezone
__all__ = ["NULL", "AzureJSONEncoder"]
TZ_UTC = timezone.utc
class _Null:
"""To create a Falsy object"""
def __bool__(self) -> bool:
return False
NULL = _Null()
"""
A falsy sentinel object which is supposed to be used to specify attributes
with no data. This gets serialized to `null` on the wire.
"""
def _timedelta_as_isostr(td: timedelta) -> str:
"""Converts a datetime.timedelta object into an ISO 8601 formatted string, e.g. 'P4DT12H30M05S'
Function adapted from the Tin Can Python project: https://github.com/RusticiSoftware/TinCanPython
:param td: The timedelta object to convert
:type td: datetime.timedelta
:return: An ISO 8601 formatted string representing the timedelta object
:rtype: str
"""
# Split seconds to larger units
seconds = td.total_seconds()
minutes, seconds = divmod(seconds, 60)
hours, minutes = divmod(minutes, 60)
days, hours = divmod(hours, 24)
days, hours, minutes = list(map(int, (days, hours, minutes)))
seconds = round(seconds, 6)
# Build date
date_str = ""
if days:
date_str = "%sD" % days
# Build time
time_str = "T"
# Hours
bigger_exists = date_str or hours
if bigger_exists:
time_str += "{:02}H".format(hours)
# Minutes
bigger_exists = bigger_exists or minutes
if bigger_exists:
time_str += "{:02}M".format(minutes)
# Seconds
try:
if seconds.is_integer():
seconds_string = "{:02}".format(int(seconds))
else:
# 9 chars long w/ leading 0, 6 digits after decimal
seconds_string = "%09.6f" % seconds
# Remove trailing zeros
seconds_string = seconds_string.rstrip("0")
except AttributeError: # int.is_integer() raises
seconds_string = "{:02}".format(seconds)
time_str += "{}S".format(seconds_string)
return "P" + date_str + time_str
def _datetime_as_isostr(dt: Union[datetime, date, time, timedelta]) -> str:
"""Converts a datetime.(datetime|date|time|timedelta) object into an ISO 8601 formatted string.
:param dt: The datetime object to convert
:type dt: datetime.datetime or datetime.date or datetime.time or datetime.timedelta
:return: An ISO 8601 formatted string representing the datetime object
:rtype: str
"""
# First try datetime.datetime
if hasattr(dt, "year") and hasattr(dt, "hour"):
dt = cast(datetime, dt)
# astimezone() fails for naive times in Python 2.7, so make make sure dt is aware (tzinfo is set)
if not dt.tzinfo:
iso_formatted = dt.replace(tzinfo=TZ_UTC).isoformat()
else:
iso_formatted = dt.astimezone(TZ_UTC).isoformat()
# Replace the trailing "+00:00" UTC offset with "Z" (RFC 3339: https://www.ietf.org/rfc/rfc3339.txt)
return iso_formatted.replace("+00:00", "Z")
# Next try datetime.date or datetime.time
try:
dt = cast(Union[date, time], dt)
return dt.isoformat()
# Last, try datetime.timedelta
except AttributeError:
dt = cast(timedelta, dt)
return _timedelta_as_isostr(dt)
class AzureJSONEncoder(JSONEncoder):
"""A JSON encoder that's capable of serializing datetime objects and bytes."""
def default(self, o: Any) -> Any: # pylint: disable=too-many-return-statements
if isinstance(o, (bytes, bytearray)):
return base64.b64encode(o).decode()
try:
return _datetime_as_isostr(o)
except AttributeError:
pass
return super(AzureJSONEncoder, self).default(o)