482 lines
16 KiB
Python
482 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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"""Functions to perform conversions between the different Confidence scales.
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As specified in STIX™ Version 2.1. Part 1: STIX Core Concepts - Appendix B"""
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def none_low_med_high_to_value(scale_value):
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"""
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This method will transform a string value from the None / Low / Med /
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High scale to its confidence integer representation.
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The scale for this confidence representation is the following:
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==================== =====================
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None/ Low/ Med/ High STIX Confidence Value
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==================== =====================
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Not Specified Not Specified
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None 0
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Low 15
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Med 50
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High 85
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==================== =====================
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Args:
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scale_value: A string value from the scale. Accepted strings are
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"None", "Low", "Med" and "High". Argument is case sensitive.
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Returns:
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int: The numerical representation corresponding to values in the None /
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Low / Med / High scale.
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Raises:
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ValueError: If `scale_value` is not within the accepted strings.
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"""
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if scale_value == "None":
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return 0
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elif scale_value == "Low":
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return 15
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elif scale_value == "Med":
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return 50
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elif scale_value == "High":
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return 85
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else:
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raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value)
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def value_to_none_low_medium_high(confidence_value):
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"""
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This method will transform an integer value into the None / Low / Med /
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High scale string representation.
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The scale for this confidence representation is the following:
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=============== ====================
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Range of Values None/ Low/ Med/ High
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=============== ====================
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0 None
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1-29 Low
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30-69 Med
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70-100 High
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=============== ====================
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Args:
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confidence_value: An integer value between 0 and 100.
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Returns:
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str: A string corresponding to the None / Low / Med / High scale.
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Raises:
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ValueError: If `confidence_value` is out of bounds.
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"""
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if confidence_value == 0:
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return "None"
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elif 29 >= confidence_value >= 1:
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return "Low"
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elif 69 >= confidence_value >= 30:
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return "Med"
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elif 100 >= confidence_value >= 70:
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return "High"
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else:
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raise ValueError("Range of values out of bounds: %s" % confidence_value)
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def zero_ten_to_value(scale_value):
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"""
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This method will transform a string value from the 0-10 scale to its
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confidence integer representation.
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The scale for this confidence representation is the following:
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==================== =====================
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0-10 Scale STIX Confidence Value
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==================== =====================
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0 0
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1 10
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2 20
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3 30
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4 40
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5 50
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6 60
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7 70
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8 80
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9 90
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10 100
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==================== =====================
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Args:
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scale_value: A string value from the scale. Accepted strings are "0"
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through "10" inclusive.
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Returns:
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int: The numerical representation corresponding to values in the 0-10
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scale.
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Raises:
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ValueError: If `scale_value` is not within the accepted strings.
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"""
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if scale_value == "0":
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return 0
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elif scale_value == "1":
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return 10
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elif scale_value == "2":
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return 20
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elif scale_value == "3":
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return 30
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elif scale_value == "4":
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return 40
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elif scale_value == "5":
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return 50
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elif scale_value == "6":
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return 60
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elif scale_value == "7":
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return 70
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elif scale_value == "8":
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return 80
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elif scale_value == "9":
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return 90
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elif scale_value == "10":
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return 100
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else:
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raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value)
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def value_to_zero_ten(confidence_value):
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"""
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This method will transform an integer value into the 0-10 scale string
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representation.
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The scale for this confidence representation is the following:
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=============== ==========
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Range of Values 0-10 Scale
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=============== ==========
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0-4 0
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5-14 1
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15-24 2
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25-34 3
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35-44 4
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45-54 5
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55-64 6
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65-74 7
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75-84 8
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85-94 9
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95-100 10
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=============== ==========
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Args:
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confidence_value: An integer value between 0 and 100.
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Returns:
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str: A string corresponding to the 0-10 scale.
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Raises:
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ValueError: If `confidence_value` is out of bounds.
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"""
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if 4 >= confidence_value >= 0:
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return "0"
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elif 14 >= confidence_value >= 5:
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return "1"
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elif 24 >= confidence_value >= 15:
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return "2"
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elif 34 >= confidence_value >= 25:
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return "3"
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elif 44 >= confidence_value >= 35:
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return "4"
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elif 54 >= confidence_value >= 45:
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return "5"
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elif 64 >= confidence_value >= 55:
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return "6"
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elif 74 >= confidence_value >= 65:
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return "7"
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elif 84 >= confidence_value >= 75:
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return "8"
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elif 94 >= confidence_value >= 85:
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return "9"
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elif 100 >= confidence_value >= 95:
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return "10"
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else:
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raise ValueError("Range of values out of bounds: %s" % confidence_value)
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def admiralty_credibility_to_value(scale_value):
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"""
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This method will transform a string value from the Admiralty Credibility
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scale to its confidence integer representation.
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The scale for this confidence representation is the following:
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============================== =====================
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Admiralty Credibility STIX Confidence Value
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============================== =====================
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6 - Truth cannot be judged (Not present)
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5 - Improbable 10
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4 - Doubtful 30
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3 - Possibly True 50
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2 - Probably True 70
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1 - Confirmed by other sources 90
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============================== =====================
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Args:
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scale_value: A string value from the scale. Accepted strings are
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"6 - Truth cannot be judged", "5 - Improbable", "4 - Doubtful",
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"3 - Possibly True", "2 - Probably True" and
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"1 - Confirmed by other sources". Argument is case sensitive.
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Returns:
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int: The numerical representation corresponding to values in the
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Admiralty Credibility scale.
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Raises:
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ValueError: If `scale_value` is not within the accepted strings.
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"""
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if scale_value == "6 - Truth cannot be judged":
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raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value) # TODO: What happens here?
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elif scale_value == "5 - Improbable":
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return 10
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elif scale_value == "4 - Doubtful":
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return 30
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elif scale_value == "3 - Possibly True":
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return 50
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elif scale_value == "2 - Probably True":
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return 70
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elif scale_value == "1 - Confirmed by other sources":
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return 90
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else:
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raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value)
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def value_to_admiralty_credibility(confidence_value):
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"""
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This method will transform an integer value into the Admiralty Credibility
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scale string representation.
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The scale for this confidence representation is the following:
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=============== ==============================
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Range of Values Admiralty Credibility
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=============== ==============================
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N/A 6 - Truth cannot be judged
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0-19 5 - Improbable
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20-39 4 - Doubtful
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40-59 3 - Possibly True
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60-79 2 - Probably True
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80-100 1 - Confirmed by other sources
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=============== ==============================
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Args:
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confidence_value: An integer value between 0 and 100.
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Returns:
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str: A string corresponding to the Admiralty Credibility scale.
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Raises:
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ValueError: If `confidence_value` is out of bounds.
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"""
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# TODO: Case "6 - Truth cannot be judged"
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if 19 >= confidence_value >= 0:
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return "5 - Improbable"
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elif 39 >= confidence_value >= 20:
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return "4 - Doubtful"
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elif 59 >= confidence_value >= 40:
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return "3 - Possibly True"
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elif 79 >= confidence_value >= 60:
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return "2 - Probably True"
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elif 100 >= confidence_value >= 80:
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return "1 - Confirmed by other sources"
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else:
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raise ValueError("Range of values out of bounds: %s" % confidence_value)
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def wep_to_value(scale_value):
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"""
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This method will transform a string value from the WEP scale to its
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confidence integer representation.
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The scale for this confidence representation is the following:
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==================================== =====================
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WEP STIX Confidence Value
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==================================== =====================
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Impossible 0
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Highly Unlikely/Almost Certainly Not 10
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Unlikely/Probably Not 20
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Even Chance 50
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Likely/Probable 70
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Highly likely/Almost Certain 90
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Certain 100
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==================================== =====================
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Args:
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scale_value: A string value from the scale. Accepted strings are
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"Impossible", "Highly Unlikely/Almost Certainly Not",
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"Unlikely/Probably Not", "Even Chance", "Likely/Probable",
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"Highly likely/Almost Certain" and "Certain". Argument is case
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sensitive.
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Returns:
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int: The numerical representation corresponding to values in the WEP
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scale.
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Raises:
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ValueError: If `scale_value` is not within the accepted strings.
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"""
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if scale_value == "Impossible":
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return 0
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elif scale_value == "Highly Unlikely/Almost Certainly Not":
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return 10
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elif scale_value == "Unlikely/Probably Not":
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return 30
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elif scale_value == "Even Chance":
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return 50
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elif scale_value == "Likely/Probable":
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return 70
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elif scale_value == "Highly likely/Almost Certain":
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return 90
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elif scale_value == "Certain":
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return 100
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else:
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raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value)
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def value_to_wep(confidence_value):
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"""
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This method will transform an integer value into the WEP scale string
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representation.
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The scale for this confidence representation is the following:
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=============== ====================================
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Range of Values WEP
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=============== ====================================
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0 Impossible
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1-19 Highly Unlikely/Almost Certainly Not
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20-39 Unlikely/Probably Not
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40-59 Even Chance
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60-79 Likely/Probable
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80-99 Highly likely/Almost Certain
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100 Certain
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=============== ====================================
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Args:
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confidence_value: An integer value between 0 and 100.
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Returns:
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str: A string corresponding to the WEP scale.
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Raises:
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ValueError: If `confidence_value` is out of bounds.
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"""
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if confidence_value == 0:
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return "Impossible"
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elif 19 >= confidence_value >= 1:
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return "Highly Unlikely/Almost Certainly Not"
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elif 39 >= confidence_value >= 20:
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return "Unlikely/Probably Not"
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elif 59 >= confidence_value >= 40:
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return "Even Chance"
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elif 79 >= confidence_value >= 60:
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return "Likely/Probable"
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elif 99 >= confidence_value >= 80:
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return "Highly likely/Almost Certain"
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elif confidence_value == 100:
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return "Certain"
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else:
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raise ValueError("Range of values out of bounds: %s" % confidence_value)
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def dni_to_value(scale_value):
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"""
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This method will transform a string value from the DNI scale to its
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confidence integer representation.
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The scale for this confidence representation is the following:
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======================================= =====================
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DNI Scale STIX Confidence Value
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======================================= =====================
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Almost No Chance / Remote 5
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Very Unlikely / Highly Improbable 15
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Unlikely / Improbable 30
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Roughly Even Change / Roughly Even Odds 50
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Likely / Probable 70
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Very Likely / Highly Probable 85
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Almost Certain / Nearly Certain 95
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======================================= =====================
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Args:
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scale_value: A string value from the scale. Accepted strings are
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"Almost No Chance / Remote", "Very Unlikely / Highly Improbable",
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"Unlikely / Improbable", "Roughly Even Change / Roughly Even Odds",
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"Likely / Probable", "Very Likely / Highly Probable" and
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"Almost Certain / Nearly Certain". Argument is case sensitive.
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Returns:
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int: The numerical representation corresponding to values in the DNI
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scale.
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Raises:
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ValueError: If `scale_value` is not within the accepted strings.
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"""
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if scale_value == "Almost No Chance / Remote":
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return 5
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elif scale_value == "Very Unlikely / Highly Improbable":
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return 15
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elif scale_value == "Unlikely / Improbable":
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return 30
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elif scale_value == "Roughly Even Change / Roughly Even Odds":
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return 50
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elif scale_value == "Likely / Probable":
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return 70
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elif scale_value == "Very Likely / Highly Probable":
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return 85
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elif scale_value == "Almost Certain / Nearly Certain":
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return 95
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else:
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raise ValueError("STIX Confidence value cannot be determined for %s" % scale_value)
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def value_to_dni(confidence_value):
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"""
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This method will transform an integer value into the DNI scale string
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representation.
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The scale for this confidence representation is the following:
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=============== =======================================
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Range of Values DNI Scale
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=============== =======================================
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0-9 Almost No Chance / Remote
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10-19 Very Unlikely / Highly Improbable
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20-39 Unlikely / Improbable
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40-59 Roughly Even Change / Roughly Even Odds
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60-79 Likely / Probable
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80-89 Very Likely / Highly Probable
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90-100 Almost Certain / Nearly Certain
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=============== =======================================
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Args:
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confidence_value: An integer value between 0 and 100.
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Returns:
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str: A string corresponding to the DNI scale.
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Raises:
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ValueError: If `confidence_value` is out of bounds.
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"""
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if 9 >= confidence_value >= 0:
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return "Almost No Chance / Remote"
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elif 19 >= confidence_value >= 10:
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return "Very Unlikely / Highly Improbable"
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elif 39 >= confidence_value >= 20:
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return "Unlikely / Improbable"
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elif 59 >= confidence_value >= 40:
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return "Roughly Even Change / Roughly Even Odds"
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elif 79 >= confidence_value >= 60:
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return "Likely / Probable"
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elif 89 >= confidence_value >= 80:
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return "Very Likely / Highly Probable"
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elif 100 >= confidence_value >= 90:
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return "Almost Certain / Nearly Certain"
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else:
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raise ValueError("Range of values out of bounds: %s" % confidence_value)
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