<s> from lux . forms import ValidationError <EOL> POLICY = dict ( effect = ( str , frozenset ( ( '<STR_LIT>' , '<STR_LIT>' ) ) ) , <EOL> action = ( ( str , list ) , None ) , <EOL> resource = ( ( str , list ) , None ) , <EOL> condition = ( dict , None ) ) <EOL> EFFECTS = { '<STR_LIT>' : True , <EOL> '<STR_LIT>' : False } <EOL> def has_permission ( request , permissions , resource , action ) : <EOL> '''<STR_LIT>''' <EOL> while resource : <EOL> permission = _check_policies ( permissions , resource , action ) <EOL> if permission is not None : <EOL> return permission <EOL> else : <EOL> default = request . config [ '<STR_LIT>' ] . get ( resource ) <EOL> if default is not None : <EOL> return _has_policy_actions ( action , default ) <EOL> resource = resource . rpartition ( '<STR_LIT::>' ) [ <NUM_LIT:0> ] <EOL> default = request . config [ '<STR_LIT>' ] <EOL> return _has_policy_actions ( action , default ) <EOL> def validate_policy ( policy ) : <EOL> if isinstance ( policy , dict ) : <EOL> return validate_single_policy ( policy ) <EOL> elif isinstance ( policy , list ) : <EOL> if not policy : <EOL> raise ValidationError ( '<STR_LIT>' ) <EOL> policies = [ ] <EOL> for single in policy : <EOL> policies . append ( validate_single_policy ( single ) ) <EOL> return policies <EOL> else : <EOL> raise ValidationError ( '<STR_LIT>' ) <EOL> def validate_single_policy ( policy ) : <EOL> if not isinstance ( policy , dict ) : <EOL> raise ValidationError ( '<STR_LIT>' ) <EOL> p = { } <EOL> for key , value in policy . items ( ) : <EOL> key = str ( key ) . lower ( ) <EOL> if key not in POLICY : <EOL> statements = '<STR_LIT:U+002CU+0020>' . join ( POLICY ) <EOL> raise ValidationError ( '<STR_LIT>' <EOL> '<STR_LIT>' % ( key , statements ) ) <EOL> types , check = POLICY [ key ] <EOL> if not isinstance ( value , types ) : <EOL> raise ValidationError ( '<STR_LIT>' % key ) <EOL> if check : <EOL> if isinstance ( value , str ) : <EOL> value = value . lower ( ) <EOL> if value not in check : <EOL> raise ValidationError ( '<STR_LIT>' % key ) <EOL> p [ key ] = value <EOL> if '<STR_LIT>' not in p : <EOL> raise ValidationError ( '<STR_LIT>' ) <EOL> if '<STR_LIT:action>' not in p : <EOL> raise ValidationError ( '<STR_LIT>' ) <EOL> return p <EOL> def _check_policies ( policies , resource , action ) : <EOL> """<STR_LIT>""" <EOL> if isinstance ( policies , dict ) : <EOL> for policy in policies . values ( ) : <EOL> permission = _has_permission ( policy , resource , action ) <EOL> if permission is not None : <EOL> return permission <EOL> return None <EOL> def _has_policy_actions ( action , actions ) : <EOL> if actions == '<STR_LIT:*>' : <EOL> return True <EOL> elif isinstance ( actions , ( list , tuple ) ) : <EOL> for act in actions : <EOL> if _has_policy_actions ( action , act ) : <EOL> return True <EOL> elif isinstance ( action , str ) and isinstance ( actions , str ) : <EOL> return action . lower ( ) == actions . lower ( ) <EOL> def _has_permission ( policy , resource , action ) : <EOL> resources = policy . get ( '<STR_LIT>' ) <EOL> if resources : <EOL> if not isinstance ( resources , list ) : <EOL> resources = ( resources , ) <EOL> for available_resource in resources : <EOL> if available_resource == resource : <EOL> if _has_policy_actions ( action , policy . get ( '<STR_LIT:action>' ) ) : <EOL> return EFFECTS . get ( policy . get ( '<STR_LIT>' , '<STR_LIT>' ) ) <EOL> return None </s>
