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annotate libervia/backend/tools/xmpp_datetime.py @ 4272:89a0999884ac default tip @

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author Goffi <goffi@goffi.org>
date Thu, 20 Jun 2024 14:46:55 +0200
parents 0d7bb4df2343
children
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1 #!/usr/bin/env python3
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2
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3 # Libervia: XMPP Date and Time profiles as per XEP-0082
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4 # Copyright (C) 2022-2022 Tim Henkes (me@syndace.dev)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 from datetime import date, datetime, time, timezone
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20 import re
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21 from typing import Optional, Tuple
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22
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23 from libervia.backend.core import exceptions
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24
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25
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26 __all__ = [ # pylint: disable=unused-variable
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27 "format_date",
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28 "parse_date",
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29 "format_datetime",
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30 "parse_datetime",
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31 "format_time",
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32 "parse_time",
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33 ]
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34
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35
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36 def __parse_fraction_of_a_second(value: str) -> Tuple[str, Optional[int]]:
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37 """
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38 datetime's strptime only supports up to six digits of the fraction of a seconds, while
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39 the XEP-0082 specification allows for any number of digits. This function parses and
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40 removes the optional fraction of a second from the input string.
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41
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42 @param value: The input string, containing a section of the format [.sss].
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43 @return: The input string with the fraction of a second removed, and the fraction of a
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44 second parsed with microsecond resolution. Returns the unaltered input string and
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45 ``None`` if no fraction of a second was found in the input string.
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46 """
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47
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48 # The following regex matches the optional fraction of a seconds for manual
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49 # processing.
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50 match = re.search(r"\.(\d*)", value)
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51 microsecond: Optional[int] = None
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52 if match is not None:
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53 # Remove the fraction of a second from the input string
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54 value = value[: match.start()] + value[match.end() :]
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55
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56 # datetime supports microsecond resolution for the fraction of a second, thus
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57 # limit/pad the parsed fraction of a second to six digits
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58 microsecond = int(match.group(1)[:6].ljust(6, "0"))
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59
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60 return value, microsecond
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61
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62
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63 def format_date(value: Optional[date] = None) -> str:
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64 """
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65 @param value: The date for format. Defaults to the current date in the UTC timezone.
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66 @return: The date formatted according to the Date profile specified in XEP-0082.
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67
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68 @warning: Formatting of the current date in the local timezone may leak geographical
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69 information of the sender. Thus, it is advised to only format the current date in
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70 UTC.
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71 """
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72 # CCYY-MM-DD
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73
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74 # The Date profile of XEP-0082 is equal to the ISO 8601 format.
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75 return (datetime.now(timezone.utc).date() if value is None else value).isoformat()
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78 def parse_date(value: str) -> date:
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79 """
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80 @param value: A string containing date information formatted according to the Date
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81 profile specified in XEP-0082.
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82 @return: The date parsed from the input string.
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83 @raise exceptions.ParsingError: if the input string is not correctly formatted.
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84 """
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85 # CCYY-MM-DD
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86
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87 # The Date profile of XEP-0082 is equal to the ISO 8601 format.
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88 try:
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89 return date.fromisoformat(value)
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90 except ValueError as e:
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91 raise exceptions.ParsingError() from e
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92
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93
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94 def format_datetime(
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95 value: Optional[datetime] = None, include_microsecond: bool = False
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96 ) -> str:
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97 """
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98 @param value: The datetime to format. Defaults to the current datetime.
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99 must be an aware datetime object (timezone must be specified)
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100 @param include_microsecond: Include the microsecond of the datetime in the output.
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101 @return: The datetime formatted according to the DateTime profile specified in
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102 XEP-0082. The datetime is always converted to UTC before formatting to avoid
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103 leaking geographical information of the sender.
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104 """
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105 # CCYY-MM-DDThh:mm:ss[.sss]TZD
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106
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107 # We format the time in UTC, since the %z formatter of strftime doesn't include colons
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108 # to separate hours and minutes which is required by XEP-0082. UTC allows us to put a
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109 # simple letter 'Z' as the time zone definition.
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110 if value is not None:
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111 if value.tzinfo is None:
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112 raise exceptions.InternalError(
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113 "an aware datetime object must be used, but a naive one has been provided"
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114 )
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115 value = value.astimezone(timezone.utc) # pylint: disable=no-member
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116 else:
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117 value = datetime.now(timezone.utc)
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118
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119 if include_microsecond:
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120 return value.strftime("%Y-%m-%dT%H:%M:%S.%fZ")
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121
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122 return value.strftime("%Y-%m-%dT%H:%M:%SZ")
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123
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124
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125 def parse_datetime(value: str) -> datetime:
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126 """
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127 @param value: A string containing datetime information formatted according to the
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128 DateTime profile specified in XEP-0082.
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129 @return: The datetime parsed from the input string.
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130 @raise exceptions.ParsingError: if the input string is not correctly formatted.
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131 """
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132 # CCYY-MM-DDThh:mm:ss[.sss]TZD
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133
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134 value, microsecond = __parse_fraction_of_a_second(value)
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135
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136 try:
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137 result = datetime.strptime(value, "%Y-%m-%dT%H:%M:%S%z")
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138 except ValueError as e:
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139 raise exceptions.ParsingError() from e
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140
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141 if microsecond is not None:
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142 result = result.replace(microsecond=microsecond)
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143
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144 return result
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145
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146
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147 def format_time(value: Optional[time] = None, include_microsecond: bool = False) -> str:
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148 """
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149 @param value: The time to format. Defaults to the current time in the UTC timezone.
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150 @param include_microsecond: Include the microsecond of the time in the output.
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151 @return: The time formatted according to the Time profile specified in XEP-0082.
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152
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153 @warning: Since accurate timezone conversion requires the date to be known, this
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154 function cannot convert input times to UTC before formatting. This means that
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155 geographical information of the sender may be leaked if a time in local timezone
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156 is formatted. Thus, when passing a time to format, it is advised to pass the time
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157 in UTC if possible.
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158 """
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159 # hh:mm:ss[.sss][TZD]
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160
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161 if value is None:
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162 # There is no time.now() method as one might expect, but the current time can be
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163 # extracted from a datetime object including time zone information.
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164 value = datetime.now(timezone.utc).timetz()
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165
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166 # The format created by time.isoformat complies with the XEP-0082 Time profile.
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167 return value.isoformat("auto" if include_microsecond else "seconds")
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168
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169
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170 def parse_time(value: str) -> time:
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171 """
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172 @param value: A string containing time information formatted according to the Time
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173 profile specified in XEP-0082.
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174 @return: The time parsed from the input string.
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175 @raise exceptions.ParsingError: if the input string is not correctly formatted.
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176 """
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177 # hh:mm:ss[.sss][TZD]
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178
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179 value, microsecond = __parse_fraction_of_a_second(value)
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180
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181 # The format parsed by time.fromisoformat mostly complies with the XEP-0082 Time
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182 # profile, except that it doesn't handle the letter Z as time zone information for
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183 # UTC. This can be fixed with a simple string replacement of 'Z' with "+00:00", which
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184 # is another way to represent UTC.
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185 try:
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186 result = time.fromisoformat(value.replace("Z", "+00:00"))
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187 except ValueError as e:
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188 raise exceptions.ParsingError() from e
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189
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190 if microsecond is not None:
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191 result = result.replace(microsecond=microsecond)
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192
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193 return result