pattern guide

stix2/patterns.py

@@ -18,6 +18,11 @@ class _Constant(object):
 
 
 class StringConstant(_Constant):
+    """Pattern string constant
+    
+    Args:
+        value (str): string value
+    """
     def __init__(self, value):
         self.value = value
 
@@ -26,6 +31,11 @@ class StringConstant(_Constant):
 
 
 class TimestampConstant(_Constant):
+    """Pattern timestamp constant
+
+    Args:
+        value (datetime.datetime OR str): if string, must be a timestamp string
+    """
     def __init__(self, value):
         try:
             self.value = parse_into_datetime(value)
@@ -37,6 +47,12 @@ class TimestampConstant(_Constant):
 
 
 class IntegerConstant(_Constant):
+    """Pattern interger constant
+
+    Args:
+        value (int): integer value
+
+    """
     def __init__(self, value):
         try:
             self.value = int(value)
@@ -59,6 +75,13 @@ class FloatConstant(_Constant):
 
 
 class BooleanConstant(_Constant):
+    """Pattern boolean constant
+
+    Args:
+       value (str OR int): 
+           (str) 'true', 't' for True; 'false', 'f' for False
+           (int) 1 for True; 0 for False
+    """ 
     def __init__(self, value):
         if isinstance(value, bool):
             self.value = value
@@ -106,6 +129,15 @@ _HASH_REGEX = {
 
 
 class HashConstant(StringConstant):
+    """Pattern hash constant
+
+    Args:
+        value (str): hash value
+        type (str): hash algorithm name
+            supported hash algorithms: "MD5", "MD6", RIPEMD160", "SHA1",
+            "SHA224", "SHA256", "SHA384", "SHA512", "SHA3224", "SHA3256",
+            "SHA3384", "SHA3512", "SSDEEP", "WHIRLPOOL"
+    """
     def __init__(self, value, type):
         key = type.upper().replace('-', '')
         if key in _HASH_REGEX:
@@ -116,7 +148,11 @@ class HashConstant(StringConstant):
 
 
 class BinaryConstant(_Constant):
+    """Pattern binary constant
 
+    Args:
+        value (str): base64 encoded string value
+    """
     def __init__(self, value):
         try:
             base64.b64decode(value)
@@ -129,6 +165,11 @@ class BinaryConstant(_Constant):
 
 
 class HexConstant(_Constant):
+    """Pattern hexadecimal constant
+
+    Args:
+        value (str): hexadecimal value
+    """ 
     def __init__(self, value):
         if not re.match('^([a-fA-F0-9]{2})+$', value):
             raise ValueError("must contain an even number of hexadecimal characters")
@@ -139,6 +180,11 @@ class HexConstant(_Constant):
 
 
 class ListConstant(_Constant):
+    """Pattern list constant
+
+    Args:
+        value (list): list of values
+    """
     def __init__(self, values):
         self.value = values
 
@@ -147,6 +193,12 @@ class ListConstant(_Constant):
 
 
 def make_constant(value):
+    """Convert value to Pattern constant, best effort attempt
+    at determining root value type and corresponding conversion
+
+    Args:
+        value (): value to convert to Pattern constant
+    """
     if isinstance(value, _Constant):
         return value
 
@@ -182,6 +234,16 @@ class _ObjectPathComponent(object):
 
 
 class BasicObjectPathComponent(_ObjectPathComponent):
+    """Basic object path component (for a observation or expression)
+
+    By "Basic", implies that the object path component is not a 
+    list, object reference or futher referenced property, i.e. terminal
+    component
+
+    Args:
+        property_name (str): object property name
+        is_key (): is dictionary key, default: False
+    """
     def __init__(self, property_name, is_key=False):
         self.property_name = property_name
         # TODO: set is_key to True if this component is a dictionary key
@@ -192,6 +254,13 @@ class BasicObjectPathComponent(_ObjectPathComponent):
 
 
 class ListObjectPathComponent(_ObjectPathComponent):
+    """List object path component (for an observation or expression)
+    
+
+    Args:
+        property_name (): list object property name
+        index (): index of the list property's value that is specified 
+    """
     def __init__(self, property_name, index):
         self.property_name = property_name
         self.index = index
@@ -201,6 +270,11 @@ class ListObjectPathComponent(_ObjectPathComponent):
 
 
 class ReferenceObjectPathComponent(_ObjectPathComponent):
+    """Reference object path component (for an observation or expression)
+
+    Args:
+        reference_property_name (str): reference object property name
+    """
     def __init__(self, reference_property_name):
         self.property_name = reference_property_name
 
@@ -209,6 +283,12 @@ class ReferenceObjectPathComponent(_ObjectPathComponent):
 
 
 class ObjectPath(object):
+    """Pattern operand object (property) path
+
+    Args:
+        object_type_name (str): name of object type for corresponding object path component
+        property_path (_ObjectPathComponent OR str): Object path 
+    """ 
     def __init__(self, object_type_name, property_path):
         self.object_type_name = object_type_name
         self.property_path = [x if isinstance(x, _ObjectPathComponent) else
@@ -219,11 +299,17 @@ class ObjectPath(object):
         return "%s:%s" % (self.object_type_name, ".".join(["%s" % x for x in self.property_path]))
 
     def merge(self, other):
+        """Extend the object property with that of the supplied object property path"""
         self.property_path.extend(other.property_path)
         return self
 
     @staticmethod
     def make_object_path(lhs):
+        """Create ObjectPath from string encoded object path
+
+        Args:
+            lhs (str): object path of left-hand-side component of expression
+        """
         path_as_parts = lhs.split(":")
         return ObjectPath(path_as_parts[0], path_as_parts[1].split("."))
 
@@ -233,6 +319,14 @@ class _PatternExpression(object):
 
 
 class _ComparisonExpression(_PatternExpression):
+    """Pattern Comparison Expression
+
+    Args:
+        operator (str): operator of comparison expression
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression 
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False
+    """
     def __init__(self, operator, lhs, rhs, negated=False):
         if operator == "=" and isinstance(rhs, (ListConstant, list)):
             self.operator = "IN"
@@ -257,56 +351,137 @@ class _ComparisonExpression(_PatternExpression):
 
 
 class EqualityComparisonExpression(_ComparisonExpression):
+    """Pattern Equality Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False
+    """
     def __init__(self, lhs, rhs, negated=False):
         super(EqualityComparisonExpression, self).__init__("=", lhs, rhs, negated)
 
 
 class GreaterThanComparisonExpression(_ComparisonExpression):
+    """Pattern Greater-than Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False
+    """
     def __init__(self, lhs, rhs, negated=False):
         super(GreaterThanComparisonExpression, self).__init__(">", lhs, rhs, negated)
 
 
 class LessThanComparisonExpression(_ComparisonExpression):
+    """Pattern Less-than Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False
+    """
     def __init__(self, lhs, rhs, negated=False):
         super(LessThanComparisonExpression, self).__init__("<", lhs, rhs, negated)
 
 
 class GreaterThanEqualComparisonExpression(_ComparisonExpression):
+    """Pattern Greater-Than-or-Equal-to Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False 
+    """
     def __init__(self, lhs, rhs, negated=False):
         super(GreaterThanEqualComparisonExpression, self).__init__(">=", lhs, rhs, negated)
 
 
 class LessThanEqualComparisonExpression(_ComparisonExpression):
+    """Pattern Less-Than-or-Equal-to Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False
+    """
+
     def __init__(self, lhs, rhs, negated=False):
         super(LessThanEqualComparisonExpression, self).__init__("<=", lhs, rhs, negated)
 
 
 class InComparisonExpression(_ComparisonExpression):
+    """'in' Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False  
+    """
     def __init__(self, lhs, rhs, negated=False):
         super(InComparisonExpression, self).__init__("IN", lhs, rhs, negated)
 
 
 class LikeComparisonExpression(_ComparisonExpression):
+    """'in' Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False  
+    """
+ 
     def __init__(self, lhs, rhs, negated=False):
         super(LikeComparisonExpression, self).__init__("LIKE", lhs, rhs, negated)
 
 
 class MatchesComparisonExpression(_ComparisonExpression):
+    """Matches Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False  
+    """
+ 
     def __init__(self, lhs, rhs, negated=False):
         super(MatchesComparisonExpression, self).__init__("MATCHES", lhs, rhs, negated)
 
 
 class IsSubsetComparisonExpression(_ComparisonExpression):
+    """ 'is subset' Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False  
+    """
+ 
     def __init__(self, lhs, rhs, negated=False):
         super(IsSubsetComparisonExpression, self).__init__("ISSUBSET", lhs, rhs, negated)
 
 
 class IsSupersetComparisonExpression(_ComparisonExpression):
+    """ 'is super set' Comparison Expression
+
+    Args:
+        lhs (ObjectPath OR str): object path of left-hand-side component of expression
+        rhs (ObjectPath OR str): object path of right-hand-side component of expression
+        negated (bool): comparison expression negated. Default: False  
+    """
+ 
     def __init__(self, lhs, rhs, negated=False):
         super(IsSupersetComparisonExpression, self).__init__("ISSUPERSET", lhs, rhs, negated)
 
 
 class _BooleanExpression(_PatternExpression):
+    """Pattern Boolean Expression
+
+    Args:
+        operator (str): boolean operator 
+        operands (list): boolean operands 
+    """
     def __init__(self, operator, operands):
         self.operator = operator 
         self.operands = []
@@ -327,16 +502,31 @@ class _BooleanExpression(_PatternExpression):
 
 
 class AndBooleanExpression(_BooleanExpression):
+    """Pattern 'AND' Boolean Expression
+
+    Args:
+        operands (list): AND operands
+    """
     def __init__(self, operands):
         super(AndBooleanExpression, self).__init__("AND", operands)
 
 
 class OrBooleanExpression(_BooleanExpression):
+    """Pattern 'OR' Boolean Expression
+
+    Args:
+        operands (list): OR operands
+    """
     def __init__(self, operands):
         super(OrBooleanExpression, self).__init__("OR", operands)
 
 
 class ObservationExpression(_PatternExpression):
+    """Observation Expression
+
+    Args:
+        operand (str): observation expression operand
+    """
     def __init__(self, operand):
         self.operand = operand
 
@@ -345,6 +535,12 @@ class ObservationExpression(_PatternExpression):
 
 
 class _CompoundObservationExpression(_PatternExpression):
+    """Compound Observation Expression
+
+    Args:
+        operator (str): compound observation operator
+        operands (str): compound observation operands
+    """
     def __init__(self, operator, operands):
         self.operator = operator
         self.operands = operands
@@ -357,21 +553,42 @@ class _CompoundObservationExpression(_PatternExpression):
 
 
 class AndObservationExpression(_CompoundObservationExpression):
+    """Pattern 'AND' Compound Observation Expression
+
+    Args:
+        operands (str): compound observation operands
+    """
+ 
     def __init__(self, operands):
         super(AndObservationExpression, self).__init__("AND", operands)
 
 
 class OrObservationExpression(_CompoundObservationExpression):
+    """Pattern 'OR' Compound Observation Expression
+
+    Args:
+        operands (str): compound observation operands
+    """ 
     def __init__(self, operands):
         super(OrObservationExpression, self).__init__("OR", operands)
 
 
 class FollowedByObservationExpression(_CompoundObservationExpression):
+    """Pattern 'Followed by' Compound Observation Expression
+
+    Args:
+        operands (str): compound observation operands
+    """ 
     def __init__(self, operands):
         super(FollowedByObservationExpression, self).__init__("FOLLOWEDBY", operands)
 
 
 class ParentheticalExpression(_PatternExpression):
+    """Pattern Parenthetical Observation Expression
+
+    Args:
+       exp (str): observation expression
+    """
     def __init__(self, exp):
         self.expression = exp
         if hasattr(exp, "root_type"):
@@ -386,6 +603,11 @@ class _ExpressionQualifier(_PatternExpression):
 
 
 class RepeatQualifier(_ExpressionQualifier):
+    """Pattern Repeat Qualifier
+
+    Args:
+        times_to_repeat (int): times the qualifiers is repeated
+    """ 
     def __init__(self, times_to_repeat):
         if isinstance(times_to_repeat, IntegerConstant):
             self.times_to_repeat = times_to_repeat
@@ -399,6 +621,11 @@ class RepeatQualifier(_ExpressionQualifier):
 
 
 class WithinQualifier(_ExpressionQualifier):
+    """Pattern 'Within' Qualifier
+
+    Args:
+        number_of_seconds (int): seconds value for 'within' qualifier
+    """
     def __init__(self, number_of_seconds):
         if isinstance(number_of_seconds, IntegerConstant):
             self.number_of_seconds = number_of_seconds
@@ -412,6 +639,12 @@ class WithinQualifier(_ExpressionQualifier):
 
 
 class StartStopQualifier(_ExpressionQualifier):
+    """Pattern Start/Stop Qualifier
+
+    Args:
+        start_time (TimestampConstant OR datetime.date): start timestamp for qualifier
+        stop_time (TimestampConstant OR datetime.date): stop timestamp for qualifier
+    """ 
     def __init__(self, start_time, stop_time):
         if isinstance(start_time, TimestampConstant):
             self.start_time = start_time
@@ -431,6 +664,12 @@ class StartStopQualifier(_ExpressionQualifier):
 
 
 class QualifiedObservationExpression(_PatternExpression):
+    """Pattern Qualified Observation Expression
+
+    Args:
+        observation_expression (PatternExpression OR _CompoundObservationExpression OR ): pattern expression
+        qualifier (_ExpressionQualifier): pattern expression qualifier 
+    """
     def __init__(self, observation_expression, qualifier):
         self.observation_expression = observation_expression
         self.qualifier = qualifier