thirdparty/google_appengine/lib/webob/webob/cachecontrol.py
author Madhusudan.C.S <madhusudancs@gmail.com>
Sat, 03 Oct 2009 22:17:58 +0530
changeset 3002 2c5e9cd4ba4d
parent 109 620f9b141567
permissions -rwxr-xr-x
Fix the deadline counter to start counting only after Task claim is accepted. Deadline counter used to start when the task was claimed to be requested. This commit fixes that.
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"""
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Represents the Cache-Control header
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"""
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import re
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from webob.updatedict import UpdateDict
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token_re = re.compile(
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    r'([a-zA-Z][a-zA-Z_-]*)\s*(?:=(?:"([^"]*)"|([^ \t",;]*)))?')
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need_quote_re = re.compile(r'[^a-zA-Z0-9._-]')
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class exists_property(object):
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    """
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    Represents a property that either is listed in the Cache-Control
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    header, or is not listed (has no value)
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    """
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    def __init__(self, prop, type=None):
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        self.prop = prop
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        self.type = type
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    def __get__(self, obj, type=None):
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        if obj is None:
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            return self
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        return self.prop in obj.properties
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    def __set__(self, obj, value):
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        if (self.type is not None
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            and self.type != obj.type):
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            raise AttributeError(
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                "The property %s only applies to %s Cache-Control" % (self.prop, self.type))
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        if value:
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            obj.properties[self.prop] = None
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        else:
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            if self.prop in obj.properties:
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                del obj.properties[self.prop]
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    def __del__(self, obj):
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        self.__set__(obj, False)
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class value_property(object):
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    """
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    Represents a property that has a value in the Cache-Control header.
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    When no value is actually given, the value of self.none is returned.
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    """
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    def __init__(self, prop, default=None, none=None, type=None):
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        self.prop = prop
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        self.default = default
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        self.none = none
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        self.type = type
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    def __get__(self, obj, type=None):
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        if obj is None:
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            return self
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        if self.prop in obj.properties:
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            value = obj.properties[self.prop]
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            if value is None:
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                return self.none
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            else:
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                return value
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        else:
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            return self.default
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    def __set__(self, obj, value):
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        if (self.type is not None
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            and self.type != obj.type):
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            raise AttributeError(
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                "The property %s only applies to %s Cache-Control" % (self.prop, self.type))
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        if value == self.default:
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            if self.prop in obj.properties:
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                del obj.properties[self.prop]
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        elif value is True:
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            obj.properties[self.prop] = None # Empty value, but present
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        else:
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            obj.properties[self.prop] = value
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    def __del__(self, obj):
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        if self.prop in obj.properties:
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            del obj.properties[self.prop]
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class CacheControl(object):
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    """
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    Represents the Cache-Control header.
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    By giving a type of ``'request'`` or ``'response'`` you can
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    control what attributes are allowed (some Cache-Control values
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    only apply to requests or responses).
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    """
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    def __init__(self, properties, type):
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        self.properties = properties
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        self.type = type
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    #@classmethod
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    def parse(cls, header, updates_to=None, type=None):
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        """
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        Parse the header, returning a CacheControl object.
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        The object is bound to the request or response object
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        ``updates_to``, if that is given.
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        """
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        if updates_to:
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            props = UpdateDict()
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            props.updated = updates_to
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        else:
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            props = {}
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        for match in token_re.finditer(header):
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            name = match.group(1)
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            value = match.group(2) or match.group(3) or None
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            if value:
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                try:
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                    value = int(value)
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                except ValueError:
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                    pass
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            props[name] = value
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        obj = cls(props, type=type)
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        if updates_to:
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            props.updated_args = (obj,)
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        return obj
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    parse = classmethod(parse)
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    def __repr__(self):
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        return '<CacheControl %r>' % str(self)
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    # Request values:
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    # no-cache shared (below)
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    # no-store shared (below)
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    # max-age shared  (below)
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    max_stale = value_property('max-stale', none='*', type='request')
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    min_fresh = value_property('min-fresh', type='request')
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    # no-transform shared (below)
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    only_if_cached = exists_property('only-if-cached', type='request')
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    # Response values:
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    public = exists_property('public', type='response')
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    private = value_property('private', none='*', type='response')
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    no_cache = value_property('no-cache', none='*')
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    no_store = exists_property('no-store')
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    no_transform = exists_property('no-transform')
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    must_revalidate = exists_property('must-revalidate', type='response')
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    proxy_revalidate = exists_property('proxy-revalidate', type='response')
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    max_age = value_property('max-age', none=-1)
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    s_maxage = value_property('s-maxage', type='response')
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    s_max_age = s_maxage
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    def __str__(self):
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        return serialize_cache_control(self.properties)
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    def copy(self):
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        """
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        Returns a copy of this object.
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        """
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        return self.__class__(self.properties.copy(), type=self.type)
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def serialize_cache_control(properties):
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    if isinstance(properties, CacheControl):
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        properties = properties.properties
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    parts = []
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    for name, value in sorted(properties.items()):
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        if value is None:
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            parts.append(name)
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            continue
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        value = str(value)
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        if need_quote_re.search(value):
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            value = '"%s"' % value
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        parts.append('%s=%s' % (name, value))
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    return ', '.join(parts)
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