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annotate src/tmp/wokkel/delay.py @ 1375:3a20312d4012

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author Goffi <goffi@goffi.org>
date Thu, 19 Mar 2015 19:47:01 +0100
parents 9141bde7ff31
children be1fccf4854d
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1 # -*- test-case-name: wokkel.test.test_delay -*-
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2 #
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3 # Copyright (c) Ralph Meijer.
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4 # See LICENSE for details.
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5
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6 """
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7 Delayed Delivery.
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8
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9 Support for comunicating Delayed Delivery information as specified by
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10 U{XEP-0203<http://xmpp.org/extensions/xep-0203.html>} and its predecessor
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11 U{XEP-0091<http://xmpp.org/extensions/xep-0091.html>}.
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12 """
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13
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14 from dateutil.parser import parse
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15 from dateutil.tz import tzutc
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16
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17 from twisted.words.protocols.jabber.jid import InvalidFormat, JID
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18 from twisted.words.xish import domish
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19
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20 NS_DELAY = 'urn:xmpp:delay'
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21 NS_JABBER_DELAY = 'jabber:x:delay'
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22
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23 class Delay(object):
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24 """
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25 Delayed Delivery information.
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26
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27 Instances of this class represent delayed delivery information that can be
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28 parsed from and rendered into both XEP-0203 and legacy XEP-0091 formats.
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29
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30 @ivar stamp: The timestamp the stanza was originally sent.
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31 @type stamp: L{datetime.datetime}
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32 @ivar sender: The optional entity that originally sent the stanza or
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33 delayed its delivery.
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34 @type sender: L{JID}
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35 """
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36
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37 def __init__(self, stamp, sender=None):
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38 self.stamp = stamp
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39 self.sender = sender
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40
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41
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42 def toElement(self, legacy=False):
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43 """
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44 Render this instance into a domish Element.
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45
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46 @param legacy: If C{True}, use the legacy XEP-0091 format.
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47 @type legacy: C{bool}
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48 """
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49 if not self.stamp:
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50 raise ValueError("stamp is required")
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51 if self.stamp.tzinfo is None:
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52 raise ValueError("stamp is not offset-aware")
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53
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54 if legacy:
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55 element = domish.Element((NS_JABBER_DELAY, 'x'))
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56 stampFormat = '%Y%m%dT%H:%M:%S'
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57 else:
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58 element = domish.Element((NS_DELAY, 'delay'))
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59 stampFormat = '%Y-%m-%dT%H:%M:%SZ'
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60
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61 stamp = self.stamp.astimezone(tzutc())
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62 element['stamp'] = stamp.strftime(stampFormat)
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63
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64 if self.sender:
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65 element['from'] = self.sender.full()
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66
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67 return element
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68
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69
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70 @staticmethod
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71 def fromElement(element):
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72 """
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73 Create an instance from a domish Element.
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74 """
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75 try:
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76 stamp = parse(element[u'stamp'])
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77
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78 # Assume UTC if no timezone was given
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79 if stamp.tzinfo is None:
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80 stamp = stamp.replace(tzinfo=tzutc())
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81 except (KeyError, ValueError, TypeError):
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82 stamp = None
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83
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84 try:
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85 sender = JID(element[u'from'])
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86 except (KeyError, InvalidFormat):
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87 sender = None
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88
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89 delay = Delay(stamp, sender)
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90 return delay
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91
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92
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93
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94 class DelayMixin(object):
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95 """
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96 Mixin for parsing delayed delivery information from stanzas.
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97
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98 This can be used as a mixin for subclasses of L{wokkel.generic.Stanza}
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99 for parsing delayed delivery information. If both XEP-0203 and XEP-0091
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100 formats are present, the former takes precedence.
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101 """
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102
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103 delay = None
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104
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105 childParsers = {
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106 (NS_DELAY, 'delay'): '_childParser_delay',
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107 (NS_JABBER_DELAY, 'x'): '_childParser_legacyDelay',
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108 }
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109
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110
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111 def _childParser_delay(self, element):
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112 self.delay = Delay.fromElement(element)
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113
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114
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115 def _childParser_legacyDelay(self, element):
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116 if not self.delay:
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117 self.delay = Delay.fromElement(element)