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import re
from pyramid.exceptions import ConfigurationError
from pyramid.traversal import (
find_interface,
traversal_path,
)
from pyramid.urldispatch import _compile_route
from pyramid.util import object_description
from pyramid.session import check_csrf_token
from .util import as_sorted_tuple
class XHRPredicate(object):
def __init__(self, val, config):
self.val = bool(val)
def text(self):
return 'xhr = %s' % self.val
phash = text
def __call__(self, context, request):
return bool(request.is_xhr) is self.val
class RequestMethodPredicate(object):
def __init__(self, val, config):
request_method = as_sorted_tuple(val)
if 'GET' in request_method and 'HEAD' not in request_method:
# GET implies HEAD too
request_method = as_sorted_tuple(request_method + ('HEAD',))
self.val = request_method
def text(self):
return 'request_method = %s' % (','.join(self.val))
phash = text
def __call__(self, context, request):
return request.method in self.val
class PathInfoPredicate(object):
def __init__(self, val, config):
self.orig = val
try:
val = re.compile(val)
except re.error as why:
raise ConfigurationError(why.args[0])
self.val = val
def text(self):
return 'path_info = %s' % (self.orig,)
phash = text
def __call__(self, context, request):
return self.val.match(request.upath_info) is not None
class RequestParamPredicate(object):
def __init__(self, val, config):
val = as_sorted_tuple(val)
reqs = []
for p in val:
k = p
v = None
if '=' in p:
k, v = p.split('=', 1)
k, v = k.strip(), v.strip()
reqs.append((k, v))
self.val = val
self.reqs = reqs
def text(self):
return 'request_param %s' % ','.join(
['%s=%s' % (x,y) if y else x for x, y in self.reqs]
)
phash = text
def __call__(self, context, request):
for k, v in self.reqs:
actual = request.params.get(k)
if actual is None:
return False
if v is not None and actual != v:
return False
return True
class HeaderPredicate(object):
def __init__(self, val, config):
name = val
v = None
if ':' in name:
name, val_str = name.split(':', 1)
try:
v = re.compile(val_str)
except re.error as why:
raise ConfigurationError(why.args[0])
if v is None:
self._text = 'header %s' % (name,)
else:
self._text = 'header %s=%s' % (name, val_str)
self.name = name
self.val = v
def text(self):
return self._text
phash = text
def __call__(self, context, request):
if self.val is None:
return self.name in request.headers
val = request.headers.get(self.name)
if val is None:
return False
return self.val.match(val) is not None
class AcceptPredicate(object):
def __init__(self, val, config):
self.val = val
def text(self):
return 'accept = %s' % (self.val,)
phash = text
def __call__(self, context, request):
return self.val in request.accept
class ContainmentPredicate(object):
def __init__(self, val, config):
self.val = config.maybe_dotted(val)
def text(self):
return 'containment = %s' % (self.val,)
phash = text
def __call__(self, context, request):
ctx = getattr(request, 'context', context)
return find_interface(ctx, self.val) is not None
class RequestTypePredicate(object):
def __init__(self, val, config):
self.val = val
def text(self):
return 'request_type = %s' % (self.val,)
phash = text
def __call__(self, context, request):
return self.val.providedBy(request)
class MatchParamPredicate(object):
def __init__(self, val, config):
val = as_sorted_tuple(val)
self.val = val
reqs = [ p.split('=', 1) for p in val ]
self.reqs = [ (x.strip(), y.strip()) for x, y in reqs ]
def text(self):
return 'match_param %s' % ','.join(
['%s=%s' % (x,y) for x, y in self.reqs]
)
phash = text
def __call__(self, context, request):
for k, v in self.reqs:
if request.matchdict.get(k) != v:
return False
return True
class CustomPredicate(object):
def __init__(self, func, config):
self.func = func
def text(self):
return getattr(
self.func,
'__text__',
'custom predicate: %s' % object_description(self.func)
)
def phash(self):
# using hash() here rather than id() is intentional: we
# want to allow custom predicates that are part of
# frameworks to be able to define custom __hash__
# functions for custom predicates, so that the hash output
# of predicate instances which are "logically the same"
# may compare equal.
return 'custom:%r' % hash(self.func)
def __call__(self, context, request):
return self.func(context, request)
class TraversePredicate(object):
# Can only be used as a *route* "predicate"; it adds 'traverse' to the
# matchdict if it's specified in the routing args. This causes the
# ResourceTreeTraverser to use the resolved traverse pattern as the
# traversal path.
def __init__(self, val, config):
_, self.tgenerate = _compile_route(val)
self.val = val
def text(self):
return 'traverse matchdict pseudo-predicate'
def phash(self):
# This isn't actually a predicate, it's just a infodict modifier that
# injects ``traverse`` into the matchdict. As a result, we don't
# need to update the hash.
return ''
def __call__(self, context, request):
if 'traverse' in context:
return True
m = context['match']
tvalue = self.tgenerate(m) # tvalue will be urlquoted string
m['traverse'] = traversal_path(tvalue)
# This isn't actually a predicate, it's just a infodict modifier that
# injects ``traverse`` into the matchdict. As a result, we just
# return True.
return True
class CheckCSRFTokenPredicate(object):
check_csrf_token = staticmethod(check_csrf_token) # testing
def __init__(self, val, config):
self.val = val
def text(self):
return 'check_csrf = %s' % (self.val,)
phash = text
def __call__(self, context, request):
val = self.val
if val:
if val is True:
val = 'csrf_token'
return self.check_csrf_token(request, val, raises=False)
return True
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