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annotate libervia/backend/tools/xmpp_datetime.py @ 4118:07370d2a9bde

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plugin XEP-0167: keep media order when starting a call: media content order is relevant when building Jingle contents/SDP notably for bundling. This patch fixes the previous behaviour of always using the same order by keeping the order of the data (i.e. order of original SDP offer). Previous behaviour could lead to call failure. rel 424
author Goffi <goffi@goffi.org>
date Tue, 03 Oct 2023 15:15:24 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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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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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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93
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94 def format_datetime(
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95 value: Optional[datetime] = None,
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96 include_microsecond: bool = False
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97 ) -> str:
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98 """
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99 @param value: The datetime to format. Defaults to the current datetime.
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100 must be an aware datetime object (timezone must be specified)
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101 @param include_microsecond: Include the microsecond of the datetime in the output.
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102 @return: The datetime formatted according to the DateTime profile specified in
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103 XEP-0082. The datetime is always converted to UTC before formatting to avoid
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104 leaking geographical information of the sender.
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105 """
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106 # CCYY-MM-DDThh:mm:ss[.sss]TZD
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107
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108 # We format the time in UTC, since the %z formatter of strftime doesn't include colons
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109 # to separate hours and minutes which is required by XEP-0082. UTC allows us to put a
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110 # simple letter 'Z' as the time zone definition.
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111 if value is not None:
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112 if value.tzinfo is None:
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113 raise exceptions.InternalError(
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114 "an aware datetime object must be used, but a naive one has been provided"
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115 )
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116 value = value.astimezone(timezone.utc) # pylint: disable=no-member
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117 else:
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118 value = datetime.now(timezone.utc)
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119
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120 if include_microsecond:
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121 return value.strftime("%Y-%m-%dT%H:%M:%S.%fZ")
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122
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123 return value.strftime("%Y-%m-%dT%H:%M:%SZ")
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124
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125
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126 def parse_datetime(value: str) -> datetime:
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127 """
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128 @param value: A string containing datetime information formatted according to the
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129 DateTime profile specified in XEP-0082.
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130 @return: The datetime parsed from the input string.
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131 @raise exceptions.ParsingError: if the input string is not correctly formatted.
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132 """
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133 # CCYY-MM-DDThh:mm:ss[.sss]TZD
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134
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135 value, microsecond = __parse_fraction_of_a_second(value)
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136
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Syndace <me@syndace.dev>
parents: 3911
diff changeset
137 try:
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
138 result = datetime.strptime(value, "%Y-%m-%dT%H:%M:%S%z")
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
139 except ValueError as e:
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
140 raise exceptions.ParsingError() from e
3877
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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141
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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142 if microsecond is not None:
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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143 result = result.replace(microsecond=microsecond)
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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144
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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145 return result
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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146
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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147
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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148 def format_time(value: Optional[time] = None, include_microsecond: bool = False) -> str:
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
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parents:
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149 """
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
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parents:
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150 @param value: The time to format. Defaults to the current time in the UTC timezone.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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151 @param include_microsecond: Include the microsecond of the time in the output.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
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parents:
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152 @return: The time formatted according to the Time profile specified in XEP-0082.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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153
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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154 @warning: Since accurate timezone conversion requires the date to be known, this
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
155 function cannot convert input times to UTC before formatting. This means that
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
156 geographical information of the sender may be leaked if a time in local timezone
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
157 is formatted. Thus, when passing a time to format, it is advised to pass the time
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
158 in UTC if possible.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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159 """
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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160 # hh:mm:ss[.sss][TZD]
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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161
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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162 if value is None:
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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163 # There is no time.now() method as one might expect, but the current time can be
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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164 # extracted from a datetime object including time zone information.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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165 value = datetime.now(timezone.utc).timetz()
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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166
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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167 # The format created by time.isoformat complies with the XEP-0082 Time profile.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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168 return value.isoformat("auto" if include_microsecond else "seconds")
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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169
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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170
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
171 def parse_time(value: str) -> time:
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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172 """
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
173 @param value: A string containing time information formatted according to the Time
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
174 profile specified in XEP-0082.
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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175 @return: The time parsed from the input string.
3933
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
176 @raise exceptions.ParsingError: if the input string is not correctly formatted.
3877
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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177 """
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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178 # hh:mm:ss[.sss][TZD]
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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179
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
180 value, microsecond = __parse_fraction_of_a_second(value)
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
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181
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
182 # The format parsed by time.fromisoformat mostly complies with the XEP-0082 Time
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
183 # profile, except that it doesn't handle the letter Z as time zone information for
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
184 # UTC. This can be fixed with a simple string replacement of 'Z' with "+00:00", which
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
185 # is another way to represent UTC.
3933
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
186 try:
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
187 result = time.fromisoformat(value.replace('Z', "+00:00"))
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
188 except ValueError as e:
cecf45416403 plugin XEP-0373 and XEP-0374: Implementation of OX and OXIM:
Syndace <me@syndace.dev>
parents: 3911
diff changeset
189 raise exceptions.ParsingError() from e
3877
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
190
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
191 if microsecond is not None:
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
192 result = result.replace(microsecond=microsecond)
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
193
00212260f659 plugin XEP-0420: Implementation of Stanza Content Encryption:
Syndace <me@syndace.dev>
parents:
diff changeset
194 return result