Varia's website
https://varia.zone
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
700 lines
26 KiB
700 lines
26 KiB
2 weeks ago
|
# -*- coding: utf-8 -*-
|
||
|
|
"""Calendar is a dictionary like Python object that can render itself as VCAL
|
||
|
|
files according to rfc2445.
|
||
|
|
|
||
|
|
These are the defined components.
|
||
|
|
"""
|
||
|
|
from datetime import datetime, timedelta
|
||
|
|
from icalendar.caselessdict import CaselessDict
|
||
|
|
from icalendar.parser import Contentline
|
||
|
|
from icalendar.parser import Contentlines
|
||
|
|
from icalendar.parser import Parameters
|
||
|
|
from icalendar.parser import q_join
|
||
|
|
from icalendar.parser import q_split
|
||
|
|
from icalendar.parser_tools import DEFAULT_ENCODING
|
||
|
|
from icalendar.prop import TypesFactory
|
||
|
|
from icalendar.prop import vText, vDDDLists
|
||
|
|
from icalendar.timezone_cache import _timezone_cache
|
||
|
|
|
||
|
|
import pytz
|
||
|
|
import dateutil.rrule, dateutil.tz
|
||
|
|
from pytz.tzinfo import DstTzInfo
|
||
|
|
|
||
|
|
from icalendar.compat import unicode_type
|
||
|
|
|
||
|
|
|
||
|
|
######################################
|
||
|
|
# The component factory
|
||
|
|
|
||
|
|
class ComponentFactory(CaselessDict):
|
||
|
|
"""All components defined in rfc 2445 are registered in this factory class.
|
||
|
|
To get a component you can use it like this.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
"""Set keys to upper for initial dict.
|
||
|
|
"""
|
||
|
|
super(ComponentFactory, self).__init__(*args, **kwargs)
|
||
|
|
self['VEVENT'] = Event
|
||
|
|
self['VTODO'] = Todo
|
||
|
|
self['VJOURNAL'] = Journal
|
||
|
|
self['VFREEBUSY'] = FreeBusy
|
||
|
|
self['VTIMEZONE'] = Timezone
|
||
|
|
self['STANDARD'] = TimezoneStandard
|
||
|
|
self['DAYLIGHT'] = TimezoneDaylight
|
||
|
|
self['VALARM'] = Alarm
|
||
|
|
self['VCALENDAR'] = Calendar
|
||
|
|
|
||
|
|
|
||
|
|
# These Properties have multiple property values inlined in one propertyline
|
||
|
|
# seperated by comma. Use CaselessDict as simple caseless set.
|
||
|
|
INLINE = CaselessDict({
|
||
|
|
'CATEGORIES': 1,
|
||
|
|
'RESOURCES': 1,
|
||
|
|
'FREEBUSY': 1,
|
||
|
|
})
|
||
|
|
|
||
|
|
_marker = []
|
||
|
|
|
||
|
|
|
||
|
|
class Component(CaselessDict):
|
||
|
|
"""Component is the base object for calendar, Event and the other
|
||
|
|
components defined in RFC 2445. normally you will not use this class
|
||
|
|
directy, but rather one of the subclasses.
|
||
|
|
"""
|
||
|
|
|
||
|
|
name = None # should be defined in each component
|
||
|
|
required = () # These properties are required
|
||
|
|
singletons = () # These properties must only appear once
|
||
|
|
multiple = () # may occur more than once
|
||
|
|
exclusive = () # These properties are mutually exclusive
|
||
|
|
inclusive = () # if any occurs the other(s) MUST occur
|
||
|
|
# ('duration', 'repeat')
|
||
|
|
ignore_exceptions = False # if True, and we cannot parse this
|
||
|
|
# component, we will silently ignore
|
||
|
|
# it, rather than let the exception
|
||
|
|
# propagate upwards
|
||
|
|
# not_compliant = [''] # List of non-compliant properties.
|
||
|
|
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
"""Set keys to upper for initial dict.
|
||
|
|
"""
|
||
|
|
super(Component, self).__init__(*args, **kwargs)
|
||
|
|
# set parameters here for properties that use non-default values
|
||
|
|
self.subcomponents = [] # Components can be nested.
|
||
|
|
self.errors = [] # If we ignored exception(s) while
|
||
|
|
# parsing a property, contains error strings
|
||
|
|
|
||
|
|
# def is_compliant(self, name):
|
||
|
|
# """Returns True is the given property name is compliant with the
|
||
|
|
# icalendar implementation.
|
||
|
|
#
|
||
|
|
# If the parser is too strict it might prevent parsing erroneous but
|
||
|
|
# otherwise compliant properties. So the parser is pretty lax, but it is
|
||
|
|
# possible to test for non-complience by calling this method.
|
||
|
|
# """
|
||
|
|
# return name in not_compliant
|
||
|
|
|
||
|
|
def __bool__(self):
|
||
|
|
"""Returns True, CaselessDict would return False if it had no items.
|
||
|
|
"""
|
||
|
|
return True
|
||
|
|
|
||
|
|
# python 2 compatibility
|
||
|
|
__nonzero__ = __bool__
|
||
|
|
|
||
|
|
def is_empty(self):
|
||
|
|
"""Returns True if Component has no items or subcomponents, else False.
|
||
|
|
"""
|
||
|
|
return True if not (list(self.values()) + self.subcomponents) else False # noqa
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_broken(self):
|
||
|
|
return bool(self.errors)
|
||
|
|
|
||
|
|
#############################
|
||
|
|
# handling of property values
|
||
|
|
|
||
|
|
def _encode(self, name, value, parameters=None, encode=1):
|
||
|
|
"""Encode values to icalendar property values.
|
||
|
|
|
||
|
|
:param name: Name of the property.
|
||
|
|
:type name: string
|
||
|
|
|
||
|
|
:param value: Value of the property. Either of a basic Python type of
|
||
|
|
any of the icalendar's own property types.
|
||
|
|
:type value: Python native type or icalendar property type.
|
||
|
|
|
||
|
|
:param parameters: Property parameter dictionary for the value. Only
|
||
|
|
available, if encode is set to True.
|
||
|
|
:type parameters: Dictionary
|
||
|
|
|
||
|
|
:param encode: True, if the value should be encoded to one of
|
||
|
|
icalendar's own property types (Fallback is "vText")
|
||
|
|
or False, if not.
|
||
|
|
:type encode: Boolean
|
||
|
|
|
||
|
|
:returns: icalendar property value
|
||
|
|
"""
|
||
|
|
if not encode:
|
||
|
|
return value
|
||
|
|
if isinstance(value, types_factory.all_types):
|
||
|
|
# Don't encode already encoded values.
|
||
|
|
return value
|
||
|
|
klass = types_factory.for_property(name)
|
||
|
|
obj = klass(value)
|
||
|
|
if parameters:
|
||
|
|
if isinstance(parameters, dict):
|
||
|
|
params = Parameters()
|
||
|
|
for key, item in parameters.items():
|
||
|
|
params[key] = item
|
||
|
|
parameters = params
|
||
|
|
assert isinstance(parameters, Parameters)
|
||
|
|
obj.params = parameters
|
||
|
|
return obj
|
||
|
|
|
||
|
|
def add(self, name, value, parameters=None, encode=1):
|
||
|
|
"""Add a property.
|
||
|
|
|
||
|
|
:param name: Name of the property.
|
||
|
|
:type name: string
|
||
|
|
|
||
|
|
:param value: Value of the property. Either of a basic Python type of
|
||
|
|
any of the icalendar's own property types.
|
||
|
|
:type value: Python native type or icalendar property type.
|
||
|
|
|
||
|
|
:param parameters: Property parameter dictionary for the value. Only
|
||
|
|
available, if encode is set to True.
|
||
|
|
:type parameters: Dictionary
|
||
|
|
|
||
|
|
:param encode: True, if the value should be encoded to one of
|
||
|
|
icalendar's own property types (Fallback is "vText")
|
||
|
|
or False, if not.
|
||
|
|
:type encode: Boolean
|
||
|
|
|
||
|
|
:returns: None
|
||
|
|
"""
|
||
|
|
if isinstance(value, datetime) and\
|
||
|
|
name.lower() in ('dtstamp', 'created', 'last-modified'):
|
||
|
|
# RFC expects UTC for those... force value conversion.
|
||
|
|
if getattr(value, 'tzinfo', False) and value.tzinfo is not None:
|
||
|
|
value = value.astimezone(pytz.utc)
|
||
|
|
else:
|
||
|
|
# assume UTC for naive datetime instances
|
||
|
|
value = pytz.utc.localize(value)
|
||
|
|
|
||
|
|
# encode value
|
||
|
|
if encode and isinstance(value, list) \
|
||
|
|
and name.lower() not in ['rdate', 'exdate', 'categories']:
|
||
|
|
# Individually convert each value to an ical type except rdate and
|
||
|
|
# exdate, where lists of dates might be passed to vDDDLists.
|
||
|
|
value = [self._encode(name, v, parameters, encode) for v in value]
|
||
|
|
else:
|
||
|
|
value = self._encode(name, value, parameters, encode)
|
||
|
|
|
||
|
|
# set value
|
||
|
|
if name in self:
|
||
|
|
# If property already exists, append it.
|
||
|
|
oldval = self[name]
|
||
|
|
if isinstance(oldval, list):
|
||
|
|
if isinstance(value, list):
|
||
|
|
value = oldval + value
|
||
|
|
else:
|
||
|
|
oldval.append(value)
|
||
|
|
value = oldval
|
||
|
|
else:
|
||
|
|
value = [oldval, value]
|
||
|
|
self[name] = value
|
||
|
|
|
||
|
|
def _decode(self, name, value):
|
||
|
|
"""Internal for decoding property values.
|
||
|
|
"""
|
||
|
|
|
||
|
|
# TODO: Currently the decoded method calls the icalendar.prop instances
|
||
|
|
# from_ical. We probably want to decode properties into Python native
|
||
|
|
# types here. But when parsing from an ical string with from_ical, we
|
||
|
|
# want to encode the string into a real icalendar.prop property.
|
||
|
|
if isinstance(value, vDDDLists):
|
||
|
|
# TODO: Workaround unfinished decoding
|
||
|
|
return value
|
||
|
|
decoded = types_factory.from_ical(name, value)
|
||
|
|
# TODO: remove when proper decoded is implemented in every prop.* class
|
||
|
|
# Workaround to decode vText properly
|
||
|
|
if isinstance(decoded, vText):
|
||
|
|
decoded = decoded.encode(DEFAULT_ENCODING)
|
||
|
|
return decoded
|
||
|
|
|
||
|
|
def decoded(self, name, default=_marker):
|
||
|
|
"""Returns decoded value of property.
|
||
|
|
"""
|
||
|
|
# XXX: fail. what's this function supposed to do in the end?
|
||
|
|
# -rnix
|
||
|
|
|
||
|
|
if name in self:
|
||
|
|
value = self[name]
|
||
|
|
if isinstance(value, list):
|
||
|
|
return [self._decode(name, v) for v in value]
|
||
|
|
return self._decode(name, value)
|
||
|
|
else:
|
||
|
|
if default is _marker:
|
||
|
|
raise KeyError(name)
|
||
|
|
else:
|
||
|
|
return default
|
||
|
|
|
||
|
|
########################################################################
|
||
|
|
# Inline values. A few properties have multiple values inlined in in one
|
||
|
|
# property line. These methods are used for splitting and joining these.
|
||
|
|
|
||
|
|
def get_inline(self, name, decode=1):
|
||
|
|
"""Returns a list of values (split on comma).
|
||
|
|
"""
|
||
|
|
vals = [v.strip('" ') for v in q_split(self[name])]
|
||
|
|
if decode:
|
||
|
|
return [self._decode(name, val) for val in vals]
|
||
|
|
return vals
|
||
|
|
|
||
|
|
def set_inline(self, name, values, encode=1):
|
||
|
|
"""Converts a list of values into comma seperated string and sets value
|
||
|
|
to that.
|
||
|
|
"""
|
||
|
|
if encode:
|
||
|
|
values = [self._encode(name, value, encode=1) for value in values]
|
||
|
|
self[name] = types_factory['inline'](q_join(values))
|
||
|
|
|
||
|
|
#########################
|
||
|
|
# Handling of components
|
||
|
|
|
||
|
|
def add_component(self, component):
|
||
|
|
"""Add a subcomponent to this component.
|
||
|
|
"""
|
||
|
|
self.subcomponents.append(component)
|
||
|
|
|
||
|
|
def _walk(self, name):
|
||
|
|
"""Walk to given component.
|
||
|
|
"""
|
||
|
|
result = []
|
||
|
|
if name is None or self.name == name:
|
||
|
|
result.append(self)
|
||
|
|
for subcomponent in self.subcomponents:
|
||
|
|
result += subcomponent._walk(name)
|
||
|
|
return result
|
||
|
|
|
||
|
|
def walk(self, name=None):
|
||
|
|
"""Recursively traverses component and subcomponents. Returns sequence
|
||
|
|
of same. If name is passed, only components with name will be returned.
|
||
|
|
"""
|
||
|
|
if name is not None:
|
||
|
|
name = name.upper()
|
||
|
|
return self._walk(name)
|
||
|
|
|
||
|
|
#####################
|
||
|
|
# Generation
|
||
|
|
|
||
|
|
def property_items(self, recursive=True, sorted=True):
|
||
|
|
"""Returns properties in this component and subcomponents as:
|
||
|
|
[(name, value), ...]
|
||
|
|
"""
|
||
|
|
vText = types_factory['text']
|
||
|
|
properties = [('BEGIN', vText(self.name).to_ical())]
|
||
|
|
if sorted:
|
||
|
|
property_names = self.sorted_keys()
|
||
|
|
else:
|
||
|
|
property_names = self.keys()
|
||
|
|
|
||
|
|
for name in property_names:
|
||
|
|
values = self[name]
|
||
|
|
if isinstance(values, list):
|
||
|
|
# normally one property is one line
|
||
|
|
for value in values:
|
||
|
|
properties.append((name, value))
|
||
|
|
else:
|
||
|
|
properties.append((name, values))
|
||
|
|
if recursive:
|
||
|
|
# recursion is fun!
|
||
|
|
for subcomponent in self.subcomponents:
|
||
|
|
properties += subcomponent.property_items(sorted=sorted)
|
||
|
|
properties.append(('END', vText(self.name).to_ical()))
|
||
|
|
return properties
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def from_ical(cls, st, multiple=False):
|
||
|
|
"""Populates the component recursively from a string.
|
||
|
|
"""
|
||
|
|
stack = [] # a stack of components
|
||
|
|
comps = []
|
||
|
|
for line in Contentlines.from_ical(st): # raw parsing
|
||
|
|
if not line:
|
||
|
|
continue
|
||
|
|
|
||
|
|
try:
|
||
|
|
name, params, vals = line.parts()
|
||
|
|
except ValueError as e:
|
||
|
|
# if unable to parse a line within a component
|
||
|
|
# that ignores exceptions, mark the component
|
||
|
|
# as broken and skip the line. otherwise raise.
|
||
|
|
component = stack[-1] if stack else None
|
||
|
|
if not component or not component.ignore_exceptions:
|
||
|
|
raise
|
||
|
|
component.errors.append((None, unicode_type(e)))
|
||
|
|
continue
|
||
|
|
|
||
|
|
uname = name.upper()
|
||
|
|
# check for start of component
|
||
|
|
if uname == 'BEGIN':
|
||
|
|
# try and create one of the components defined in the spec,
|
||
|
|
# otherwise get a general Components for robustness.
|
||
|
|
c_name = vals.upper()
|
||
|
|
c_class = component_factory.get(c_name, Component)
|
||
|
|
# If component factory cannot resolve ``c_name``, the generic
|
||
|
|
# ``Component`` class is used which does not have the name set.
|
||
|
|
# That's opposed to the usage of ``cls``, which represents a
|
||
|
|
# more concrete subclass with a name set (e.g. VCALENDAR).
|
||
|
|
component = c_class()
|
||
|
|
if not getattr(component, 'name', ''): # undefined components
|
||
|
|
component.name = c_name
|
||
|
|
stack.append(component)
|
||
|
|
# check for end of event
|
||
|
|
elif uname == 'END':
|
||
|
|
# we are done adding properties to this component
|
||
|
|
# so pop it from the stack and add it to the new top.
|
||
|
|
component = stack.pop()
|
||
|
|
if not stack: # we are at the end
|
||
|
|
comps.append(component)
|
||
|
|
else:
|
||
|
|
stack[-1].add_component(component)
|
||
|
|
if vals == 'VTIMEZONE' and \
|
||
|
|
'TZID' in component and \
|
||
|
|
component['TZID'] not in pytz.all_timezones and \
|
||
|
|
component['TZID'] not in _timezone_cache:
|
||
|
|
_timezone_cache[component['TZID']] = component.to_tz()
|
||
|
|
# we are adding properties to the current top of the stack
|
||
|
|
else:
|
||
|
|
factory = types_factory.for_property(name)
|
||
|
|
component = stack[-1] if stack else None
|
||
|
|
if not component:
|
||
|
|
raise ValueError('Property "{prop}" does not have '
|
||
|
|
'a parent component.'.format(prop=name))
|
||
|
|
datetime_names = ('DTSTART', 'DTEND', 'RECURRENCE-ID', 'DUE',
|
||
|
|
'FREEBUSY', 'RDATE', 'EXDATE')
|
||
|
|
try:
|
||
|
|
if name in datetime_names and 'TZID' in params:
|
||
|
|
vals = factory(factory.from_ical(vals, params['TZID']))
|
||
|
|
else:
|
||
|
|
vals = factory(factory.from_ical(vals))
|
||
|
|
except ValueError as e:
|
||
|
|
if not component.ignore_exceptions:
|
||
|
|
raise
|
||
|
|
component.errors.append((uname, unicode_type(e)))
|
||
|
|
component.add(name, None, encode=0)
|
||
|
|
else:
|
||
|
|
vals.params = params
|
||
|
|
component.add(name, vals, encode=0)
|
||
|
|
|
||
|
|
if multiple:
|
||
|
|
return comps
|
||
|
|
if len(comps) > 1:
|
||
|
|
raise ValueError('Found multiple components where '
|
||
|
|
'only one is allowed: {st!r}'.format(**locals()))
|
||
|
|
if len(comps) < 1:
|
||
|
|
raise ValueError('Found no components where '
|
||
|
|
'exactly one is required: '
|
||
|
|
'{st!r}'.format(**locals()))
|
||
|
|
return comps[0]
|
||
|
|
|
||
|
|
def content_line(self, name, value, sorted=True):
|
||
|
|
"""Returns property as content line.
|
||
|
|
"""
|
||
|
|
params = getattr(value, 'params', Parameters())
|
||
|
|
return Contentline.from_parts(name, params, value, sorted=sorted)
|
||
|
|
|
||
|
|
def content_lines(self, sorted=True):
|
||
|
|
"""Converts the Component and subcomponents into content lines.
|
||
|
|
"""
|
||
|
|
contentlines = Contentlines()
|
||
|
|
for name, value in self.property_items(sorted=sorted):
|
||
|
|
cl = self.content_line(name, value, sorted=sorted)
|
||
|
|
contentlines.append(cl)
|
||
|
|
contentlines.append('') # remember the empty string in the end
|
||
|
|
return contentlines
|
||
|
|
|
||
|
|
def to_ical(self, sorted=True):
|
||
|
|
'''
|
||
|
|
:param sorted: Whether parameters and properties should be
|
||
|
|
lexicographically sorted.
|
||
|
|
'''
|
||
|
|
|
||
|
|
content_lines = self.content_lines(sorted=sorted)
|
||
|
|
return content_lines.to_ical()
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
"""String representation of class with all of it's subcomponents.
|
||
|
|
"""
|
||
|
|
subs = ', '.join([str(it) for it in self.subcomponents])
|
||
|
|
return '%s(%s%s)' % (
|
||
|
|
self.name or type(self).__name__,
|
||
|
|
dict(self),
|
||
|
|
', %s' % subs if subs else ''
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
#######################################
|
||
|
|
# components defined in RFC 5545
|
||
|
|
|
||
|
|
class Event(Component):
|
||
|
|
|
||
|
|
name = 'VEVENT'
|
||
|
|
|
||
|
|
canonical_order = (
|
||
|
|
'SUMMARY', 'DTSTART', 'DTEND', 'DURATION', 'DTSTAMP',
|
||
|
|
'UID', 'RECURRENCE-ID', 'SEQUENCE', 'RRULE', 'RDATE',
|
||
|
|
'EXDATE',
|
||
|
|
)
|
||
|
|
|
||
|
|
required = ('UID', 'DTSTAMP',)
|
||
|
|
singletons = (
|
||
|
|
'CLASS', 'CREATED', 'DESCRIPTION', 'DTSTART', 'GEO', 'LAST-MODIFIED',
|
||
|
|
'LOCATION', 'ORGANIZER', 'PRIORITY', 'DTSTAMP', 'SEQUENCE', 'STATUS',
|
||
|
|
'SUMMARY', 'TRANSP', 'URL', 'RECURRENCE-ID', 'DTEND', 'DURATION',
|
||
|
|
'UID', 'CATEGORIES',
|
||
|
|
)
|
||
|
|
exclusive = ('DTEND', 'DURATION',)
|
||
|
|
multiple = (
|
||
|
|
'ATTACH', 'ATTENDEE', 'COMMENT', 'CONTACT', 'EXDATE',
|
||
|
|
'RSTATUS', 'RELATED', 'RESOURCES', 'RDATE', 'RRULE'
|
||
|
|
)
|
||
|
|
ignore_exceptions = True
|
||
|
|
|
||
|
|
|
||
|
|
class Todo(Component):
|
||
|
|
|
||
|
|
name = 'VTODO'
|
||
|
|
|
||
|
|
required = ('UID', 'DTSTAMP',)
|
||
|
|
singletons = (
|
||
|
|
'CLASS', 'COMPLETED', 'CREATED', 'DESCRIPTION', 'DTSTAMP', 'DTSTART',
|
||
|
|
'GEO', 'LAST-MODIFIED', 'LOCATION', 'ORGANIZER', 'PERCENT-COMPLETE',
|
||
|
|
'PRIORITY', 'RECURRENCE-ID', 'SEQUENCE', 'STATUS', 'SUMMARY', 'UID',
|
||
|
|
'URL', 'DUE', 'DURATION',
|
||
|
|
)
|
||
|
|
exclusive = ('DUE', 'DURATION',)
|
||
|
|
multiple = (
|
||
|
|
'ATTACH', 'ATTENDEE', 'CATEGORIES', 'COMMENT', 'CONTACT', 'EXDATE',
|
||
|
|
'RSTATUS', 'RELATED', 'RESOURCES', 'RDATE', 'RRULE'
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class Journal(Component):
|
||
|
|
|
||
|
|
name = 'VJOURNAL'
|
||
|
|
|
||
|
|
required = ('UID', 'DTSTAMP',)
|
||
|
|
singletons = (
|
||
|
|
'CLASS', 'CREATED', 'DTSTART', 'DTSTAMP', 'LAST-MODIFIED', 'ORGANIZER',
|
||
|
|
'RECURRENCE-ID', 'SEQUENCE', 'STATUS', 'SUMMARY', 'UID', 'URL',
|
||
|
|
)
|
||
|
|
multiple = (
|
||
|
|
'ATTACH', 'ATTENDEE', 'CATEGORIES', 'COMMENT', 'CONTACT', 'EXDATE',
|
||
|
|
'RELATED', 'RDATE', 'RRULE', 'RSTATUS', 'DESCRIPTION',
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class FreeBusy(Component):
|
||
|
|
|
||
|
|
name = 'VFREEBUSY'
|
||
|
|
|
||
|
|
required = ('UID', 'DTSTAMP',)
|
||
|
|
singletons = (
|
||
|
|
'CONTACT', 'DTSTART', 'DTEND', 'DTSTAMP', 'ORGANIZER',
|
||
|
|
'UID', 'URL',
|
||
|
|
)
|
||
|
|
multiple = ('ATTENDEE', 'COMMENT', 'FREEBUSY', 'RSTATUS',)
|
||
|
|
|
||
|
|
|
||
|
|
class Timezone(Component):
|
||
|
|
name = 'VTIMEZONE'
|
||
|
|
canonical_order = ('TZID',)
|
||
|
|
required = ('TZID',) # it also requires one of components DAYLIGHT and STANDARD
|
||
|
|
singletons = ('TZID', 'LAST-MODIFIED', 'TZURL',)
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _extract_offsets(component, tzname):
|
||
|
|
"""extract offsets and transition times from a VTIMEZONE component
|
||
|
|
:param component: a STANDARD or DAYLIGHT component
|
||
|
|
:param tzname: the name of the zone
|
||
|
|
"""
|
||
|
|
offsetfrom = component['TZOFFSETFROM'].td
|
||
|
|
offsetto = component['TZOFFSETTO'].td
|
||
|
|
dtstart = component['DTSTART'].dt
|
||
|
|
|
||
|
|
# offsets need to be rounded to the next minute, we might loose up
|
||
|
|
# to 30 seconds accuracy, but it can't be helped (datetime
|
||
|
|
# supposedly cannot handle smaller offsets)
|
||
|
|
offsetto_s = int((offsetto.seconds + 30) / 60) * 60
|
||
|
|
offsetto = timedelta(days=offsetto.days, seconds=offsetto_s)
|
||
|
|
offsetfrom_s = int((offsetfrom.seconds + 30) / 60) * 60
|
||
|
|
offsetfrom = timedelta(days=offsetfrom.days, seconds=offsetfrom_s)
|
||
|
|
|
||
|
|
# expand recurrences
|
||
|
|
if 'RRULE' in component:
|
||
|
|
# to be paranoid about correct weekdays
|
||
|
|
# evaluate the rrule with the current offset
|
||
|
|
tzi = dateutil.tz.tzoffset ("(offsetfrom)", offsetfrom)
|
||
|
|
rrstart = dtstart.replace (tzinfo=tzi)
|
||
|
|
|
||
|
|
rrulestr = component['RRULE'].to_ical().decode('utf-8')
|
||
|
|
rrule = dateutil.rrule.rrulestr(rrulestr, dtstart=rrstart)
|
||
|
|
if not {'UNTIL', 'COUNT'}.intersection(component['RRULE'].keys()):
|
||
|
|
# pytz.timezones don't know any transition dates after 2038
|
||
|
|
# either
|
||
|
|
rrule._until = datetime(2038, 12, 31, tzinfo=pytz.UTC)
|
||
|
|
|
||
|
|
# constructing the pytz-timezone requires UTC transition times.
|
||
|
|
# here we construct local times without tzinfo, the offset to UTC
|
||
|
|
# gets subtracted in to_tz().
|
||
|
|
transtimes = [dt.replace (tzinfo=None) for dt in rrule]
|
||
|
|
|
||
|
|
# or rdates
|
||
|
|
elif 'RDATE' in component:
|
||
|
|
if not isinstance(component['RDATE'], list):
|
||
|
|
rdates = [component['RDATE']]
|
||
|
|
else:
|
||
|
|
rdates = component['RDATE']
|
||
|
|
transtimes = [dtstart] + [leaf.dt for tree in rdates for
|
||
|
|
leaf in tree.dts]
|
||
|
|
else:
|
||
|
|
transtimes = [dtstart]
|
||
|
|
|
||
|
|
transitions = [(transtime, offsetfrom, offsetto, tzname) for
|
||
|
|
transtime in set(transtimes)]
|
||
|
|
|
||
|
|
if component.name == 'STANDARD':
|
||
|
|
is_dst = 0
|
||
|
|
elif component.name == 'DAYLIGHT':
|
||
|
|
is_dst = 1
|
||
|
|
return is_dst, transitions
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _make_unique_tzname(tzname, tznames):
|
||
|
|
"""
|
||
|
|
:param tzname: Candidate tzname
|
||
|
|
:param tznames: Other tznames
|
||
|
|
"""
|
||
|
|
# TODO better way of making sure tznames are unique
|
||
|
|
while tzname in tznames:
|
||
|
|
tzname += '_1'
|
||
|
|
tznames.add(tzname)
|
||
|
|
return tzname
|
||
|
|
|
||
|
|
def to_tz(self):
|
||
|
|
"""convert this VTIMEZONE component to a pytz.timezone object
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
zone = str(self['TZID'])
|
||
|
|
except UnicodeEncodeError:
|
||
|
|
zone = self['TZID'].encode('ascii', 'replace')
|
||
|
|
transitions = []
|
||
|
|
dst = {}
|
||
|
|
tznames = set()
|
||
|
|
for component in self.walk():
|
||
|
|
if type(component) == Timezone:
|
||
|
|
continue
|
||
|
|
assert isinstance(component['DTSTART'].dt, datetime), (
|
||
|
|
"VTIMEZONEs sub-components' DTSTART must be of type datetime, not date"
|
||
|
|
)
|
||
|
|
try:
|
||
|
|
tzname = str(component['TZNAME'])
|
||
|
|
except UnicodeEncodeError:
|
||
|
|
tzname = component['TZNAME'].encode('ascii', 'replace')
|
||
|
|
tzname = self._make_unique_tzname(tzname, tznames)
|
||
|
|
except KeyError:
|
||
|
|
tzname = '{0}_{1}_{2}_{3}'.format(
|
||
|
|
zone,
|
||
|
|
component['DTSTART'].to_ical().decode('utf-8'),
|
||
|
|
component['TZOFFSETFROM'].to_ical(), # for whatever reason this is str/unicode
|
||
|
|
component['TZOFFSETTO'].to_ical(), # for whatever reason this is str/unicode
|
||
|
|
)
|
||
|
|
tzname = self._make_unique_tzname(tzname, tznames)
|
||
|
|
|
||
|
|
dst[tzname], component_transitions = self._extract_offsets(
|
||
|
|
component, tzname
|
||
|
|
)
|
||
|
|
transitions.extend(component_transitions)
|
||
|
|
|
||
|
|
transitions.sort()
|
||
|
|
transition_times = [
|
||
|
|
transtime - osfrom for transtime, osfrom, _, _ in transitions
|
||
|
|
]
|
||
|
|
|
||
|
|
# transition_info is a list with tuples in the format
|
||
|
|
# (utcoffset, dstoffset, name)
|
||
|
|
# dstoffset = 0, if current transition is to standard time
|
||
|
|
# = this_utcoffset - prev_standard_utcoffset, otherwise
|
||
|
|
transition_info = []
|
||
|
|
for num, (transtime, osfrom, osto, name) in enumerate(transitions):
|
||
|
|
dst_offset = False
|
||
|
|
if not dst[name]:
|
||
|
|
dst_offset = timedelta(seconds=0)
|
||
|
|
else:
|
||
|
|
# go back in time until we find a transition to dst
|
||
|
|
for index in range(num - 1, -1, -1):
|
||
|
|
if not dst[transitions[index][3]]: # [3] is the name
|
||
|
|
dst_offset = osto - transitions[index][2] # [2] is osto # noqa
|
||
|
|
break
|
||
|
|
# when the first transition is to dst, we didn't find anything
|
||
|
|
# in the past, so we have to look into the future
|
||
|
|
if not dst_offset:
|
||
|
|
for index in range(num, len(transitions)):
|
||
|
|
if not dst[transitions[index][3]]: # [3] is the name
|
||
|
|
dst_offset = osto - transitions[index][2] # [2] is osto # noqa
|
||
|
|
break
|
||
|
|
assert dst_offset is not False
|
||
|
|
transition_info.append((osto, dst_offset, name))
|
||
|
|
|
||
|
|
cls = type(zone, (DstTzInfo,), {
|
||
|
|
'zone': zone,
|
||
|
|
'_utc_transition_times': transition_times,
|
||
|
|
'_transition_info': transition_info
|
||
|
|
})
|
||
|
|
|
||
|
|
return cls()
|
||
|
|
|
||
|
|
|
||
|
|
class TimezoneStandard(Component):
|
||
|
|
name = 'STANDARD'
|
||
|
|
required = ('DTSTART', 'TZOFFSETTO', 'TZOFFSETFROM')
|
||
|
|
singletons = ('DTSTART', 'TZOFFSETTO', 'TZOFFSETFROM',)
|
||
|
|
multiple = ('COMMENT', 'RDATE', 'TZNAME', 'RRULE', 'EXDATE')
|
||
|
|
|
||
|
|
|
||
|
|
class TimezoneDaylight(Component):
|
||
|
|
name = 'DAYLIGHT'
|
||
|
|
required = TimezoneStandard.required
|
||
|
|
singletons = TimezoneStandard.singletons
|
||
|
|
multiple = TimezoneStandard.multiple
|
||
|
|
|
||
|
|
|
||
|
|
class Alarm(Component):
|
||
|
|
|
||
|
|
name = 'VALARM'
|
||
|
|
# some properties MAY/MUST/MUST NOT appear depending on ACTION value
|
||
|
|
required = ('ACTION', 'TRIGGER',)
|
||
|
|
singletons = (
|
||
|
|
'ATTACH', 'ACTION', 'DESCRIPTION', 'SUMMARY', 'TRIGGER',
|
||
|
|
'DURATION', 'REPEAT',
|
||
|
|
)
|
||
|
|
inclusive = (('DURATION', 'REPEAT',), ('SUMMARY', 'ATTENDEE',))
|
||
|
|
multiple = ('ATTENDEE', 'ATTACH')
|
||
|
|
|
||
|
|
|
||
|
|
class Calendar(Component):
|
||
|
|
"""This is the base object for an iCalendar file.
|
||
|
|
"""
|
||
|
|
name = 'VCALENDAR'
|
||
|
|
canonical_order = ('VERSION', 'PRODID', 'CALSCALE', 'METHOD',)
|
||
|
|
required = ('PRODID', 'VERSION', )
|
||
|
|
singletons = ('PRODID', 'VERSION', 'CALSCALE', 'METHOD')
|
||
|
|
|
||
|
|
# These are read only singleton, so one instance is enough for the module
|
||
|
|
types_factory = TypesFactory()
|
||
|
|
component_factory = ComponentFactory()
|