mirror of https://github.com/dirtbags/moth.git
420 lines
13 KiB
Python
420 lines
13 KiB
Python
#!/usr/bin/python3
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import argparse
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import contextlib
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import glob
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import hashlib
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import html
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import io
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import importlib.machinery
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import mistune
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import os
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import random
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import string
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import tempfile
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import shlex
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import yaml
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messageChars = b'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
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def djb2hash(str):
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h = 5381
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for c in str.encode("utf-8"):
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h = ((h * 33) + c) & 0xffffffff
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return h
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@contextlib.contextmanager
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def pushd(newdir):
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curdir = os.getcwd()
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os.chdir(newdir)
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try:
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yield
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finally:
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os.chdir(curdir)
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def loadmod(name, path):
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abspath = os.path.abspath(path)
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loader = importlib.machinery.SourceFileLoader(name, abspath)
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return loader.load_module()
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# Get a big list of clean words for our answer file.
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ANSWER_WORDS = [w.strip() for w in open(os.path.join(os.path.dirname(__file__),
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'answer_words.txt'))]
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class PuzzleFile:
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"""A file associated with a puzzle.
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path: The path to the original input file. May be None (when this is created from a file handle
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and there is no original input.
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handle: A File-like object set to read the file from. You should be able to read straight
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from it without having to seek to the beginning of the file.
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name: The name of the output file.
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visible: A boolean indicating whether this file should visible to the user. If False,
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the file is still expected to be accessible, but it's path must be known
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(or figured out) to retrieve it."""
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def __init__(self, stream, name, visible=True):
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self.stream = stream
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self.name = name
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self.visible = visible
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class PuzzleSuccess(dict):
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"""Puzzle success objectives
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:param acceptable: Learning outcome from acceptable knowledge of the subject matter
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:param mastery: Learning outcome from mastery of the subject matter
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"""
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valid_fields = ["acceptable", "mastery"]
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def __init__(self, **kwargs):
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super(PuzzleSuccess, self).__init__()
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for key in self.valid_fields:
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self[key] = None
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for key, value in kwargs.items():
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if key in self.valid_fields:
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self[key] = value
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def __getattr__(self, attr):
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if attr in self.valid_fields:
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return self[attr]
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raise AttributeError("'%s' object has no attribute '%s'" % (type(self).__name__, attr))
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def __setattr__(self, attr, value):
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if attr in self.valid_fields:
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self[attr] = value
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else:
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raise AttributeError("'%s' object has no attribute '%s'" % (type(self).__name__, attr))
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class Puzzle:
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def __init__(self, category_seed, points):
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"""A MOTH Puzzle.
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:param category_seed: A byte string to use as a seed for random numbers for this puzzle.
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It is combined with the puzzle points.
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:param points: The point value of the puzzle.
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"""
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super().__init__()
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self.points = points
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self.summary = None
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self.authors = []
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self.answers = []
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self.scripts = []
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self.pattern = None
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self.hint = None
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self.files = {}
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self.body = io.StringIO()
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# NIST NICE objective content
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self.objective = None # Text describing the expected learning outcome from solving this puzzle, *why* are you solving this puzzle
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self.success = PuzzleSuccess() # Text describing criteria for different levels of success, e.g. {"Acceptable": "Did OK", "Mastery": "Did even better"}
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self.solution = None # Text describing how to solve the puzzle
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self.ksas = [] # A list of references to related NICE KSAs (e.g. K0058, . . .)
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self.logs = []
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self.randseed = category_seed * self.points
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self.rand = random.Random(self.randseed)
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def log(self, *vals):
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"""Add a new log message to this puzzle."""
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msg = ' '.join(str(v) for v in vals)
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self.logs.append(msg)
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def read_stream(self, stream):
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header = True
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line = ""
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if stream.read(3) == "---":
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header = "yaml"
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else:
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header = "moth"
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stream.seek(0)
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if header == "yaml":
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self.read_yaml_header(stream)
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elif header == "moth":
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self.read_moth_header(stream)
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for line in stream:
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self.body.write(line)
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def read_yaml_header(self, stream):
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contents = ""
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header = False
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for line in stream:
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if line.strip() == "---" and header: # Handle last line
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break
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elif line.strip() == "---": # Handle first line
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header = True
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continue
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else:
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contents += line
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config = yaml.safe_load(contents)
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for key, value in config.items():
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key = key.lower()
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self.handle_header_key(key, value)
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def read_moth_header(self, stream):
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for line in stream:
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line = line.strip()
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if not line:
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break
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key, val = line.split(':', 1)
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key = key.lower()
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val = val.strip()
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self.handle_header_key(key, val)
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def handle_header_key(self, key, val):
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if key == 'author':
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self.authors.append(val)
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elif key == 'summary':
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self.summary = val
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elif key == 'answer':
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if not isinstance(val, str):
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raise ValueError("Answers must be strings, got %s, instead" % (type(val),))
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self.answers.append(val)
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elif key == "answers":
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for answer in val:
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if not isinstance(answer, str):
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raise ValueError("Answers must be strings, got %s, instead" % (type(answer),))
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self.answers.append(answer)
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elif key == 'pattern':
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self.pattern = val
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elif key == 'hint':
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self.hint = val
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elif key == 'name':
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pass
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elif key == 'file':
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parts = shlex.split(val)
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name = parts[0]
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hidden = False
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stream = open(name, 'rb')
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try:
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name = parts[1]
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hidden = (parts[2].lower() == "hidden")
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except IndexError:
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pass
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self.files[name] = PuzzleFile(stream, name, not hidden)
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elif key == 'script':
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stream = open(val, 'rb')
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# Make sure this shows up in the header block of the HTML output.
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self.files[val] = PuzzleFile(stream, val, visible=False)
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self.scripts.append(val)
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elif key == "objective":
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self.objective = val
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elif key == "success":
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# Force success dictionary keys to be lower-case
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self.success = dict((x.lower(), y) for x,y in val.items())
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elif key == "success.acceptable":
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self.success.acceptable = val
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elif key == "success.mastery":
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self.success.mastery = val
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elif key == "solution":
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self.solution = val
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elif key == "ksa":
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self.ksas.append(val)
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else:
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raise ValueError("Unrecognized header field: {}".format(key))
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def read_directory(self, path):
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try:
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puzzle_mod = loadmod("puzzle", os.path.join(path, "puzzle.py"))
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except FileNotFoundError:
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puzzle_mod = None
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with pushd(path):
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if puzzle_mod:
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puzzle_mod.make(self)
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else:
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with open('puzzle.moth') as f:
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self.read_stream(f)
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def random_hash(self):
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"""Create a file basename (no extension) with our number generator."""
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return ''.join(self.rand.choice(string.ascii_lowercase) for i in range(8))
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def make_temp_file(self, name=None, visible=True):
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"""Get a file object for adding dynamically generated data to the puzzle. When you're
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done with this file, flush it, but don't close it.
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:param name: The name of the file for links within the puzzle. If this is None, a name
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will be generated for you.
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:param visible: Whether or not the file will be visible to the user.
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:return: A file object for writing
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"""
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stream = tempfile.TemporaryFile()
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self.add_stream(stream, name, visible)
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return stream
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def add_stream(self, stream, name=None, visible=True):
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if name is None:
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name = self.random_hash()
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self.files[name] = PuzzleFile(stream, name, visible)
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def add_file(self, filename, visible=True):
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fd = open(filename, 'rb')
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name = os.path.basename(filename)
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self.add_stream(fd, name=name, visible=visible)
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def randword(self):
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"""Return a randomly-chosen word"""
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return self.rand.choice(ANSWER_WORDS)
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def make_answer(self, word_count=4, sep=' '):
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"""Generate and return a new answer. It's automatically added to the puzzle answer list.
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:param int word_count: The number of words to include in the answer.
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:param str|bytes sep: The word separator.
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:returns: The answer string
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"""
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words = [self.randword() for i in range(word_count)]
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answer = sep.join(words)
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self.answers.append(answer)
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return answer
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hexdump_stdch = stdch = (
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'················'
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'················'
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' !"#$%&\'()*+,-./'
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'0123456789:;<=>?'
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'@ABCDEFGHIJKLMNO'
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'PQRSTUVWXYZ[\]^_'
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'`abcdefghijklmno'
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'pqrstuvwxyz{|}~·'
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'················'
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'················'
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'················'
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'················'
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'················'
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'················'
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'················'
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'················'
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)
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def hexdump(self, buf, charset=hexdump_stdch, gap=('<EFBFBD>', '⌷')):
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hexes, chars = [], []
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out = []
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for b in buf:
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if len(chars) == 16:
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out.append((hexes, chars))
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hexes, chars = [], []
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if b is None:
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h, c = gap
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else:
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h = '{:02x}'.format(b)
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c = charset[b]
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chars.append(c)
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hexes.append(h)
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out.append((hexes, chars))
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offset = 0
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elided = False
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lastchars = None
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self.body.write('<pre>')
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for hexes, chars in out:
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if chars == lastchars:
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offset += len(chars)
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if not elided:
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self.body.write('*\n')
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elided = True
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continue
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lastchars = chars[:]
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elided = False
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pad = 16 - len(chars)
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hexes += [' '] * pad
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self.body.write('{:08x} '.format(offset))
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self.body.write(' '.join(hexes[:8]))
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self.body.write(' ')
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self.body.write(' '.join(hexes[8:]))
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self.body.write(' |')
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self.body.write(html.escape(''.join(chars)))
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self.body.write('|\n')
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offset += len(chars)
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self.body.write('{:08x}\n'.format(offset))
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self.body.write('</pre>')
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def get_authors(self):
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return self.authors or [self.author]
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def get_body(self):
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return self.body.getvalue()
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def html_body(self):
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"""Format and return the markdown for the puzzle body."""
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return mistune.markdown(self.get_body(), escape=False)
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def package(self, answers=False):
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"""Return a dict packaging of the puzzle."""
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files = [fn for fn,f in self.files.items() if f.visible]
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return {
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'authors': self.authors,
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'hashes': self.hashes(),
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'files': files,
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'scripts': self.scripts,
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'pattern': self.pattern,
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'body': self.html_body(),
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'objective': self.objective,
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'success': self.success,
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'solution': self.solution,
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'ksas': self.ksas,
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}
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def hashes(self):
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"Return a list of answer hashes"
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return [djb2hash(a) for a in self.answers]
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class Category:
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def __init__(self, path, seed):
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self.path = path
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self.seed = seed
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self.catmod = None
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try:
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self.catmod = loadmod('category', os.path.join(path, 'category.py'))
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except FileNotFoundError:
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self.catmod = None
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def pointvals(self):
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if self.catmod:
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with pushd(self.path):
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pointvals = self.catmod.pointvals()
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else:
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pointvals = []
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for fpath in glob.glob(os.path.join(self.path, "[0-9]*")):
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pn = os.path.basename(fpath)
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points = int(pn)
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pointvals.append(points)
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return sorted(pointvals)
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def puzzle(self, points):
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puzzle = Puzzle(self.seed, points)
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path = os.path.join(self.path, str(points))
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if self.catmod:
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with pushd(self.path):
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self.catmod.make(points, puzzle)
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else:
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puzzle.read_directory(path)
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return puzzle
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def __iter__(self):
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for points in self.pointvals():
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yield self.puzzle(points)
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