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