mirror of https://github.com/dirtbags/moth.git
323 lines
12 KiB
Python
323 lines
12 KiB
Python
#!/usr/bin/python3
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import argparse
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from collections import defaultdict, namedtuple
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import glob
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import hashlib
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from importlib.machinery import SourceFileLoader
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import mistune
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import os
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import random
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import tempfile
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messageChars = b'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
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def djb2hash(buf):
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h = 5381
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for c in buf:
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h = ((h * 33) + c) & 0xffffffff
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return h
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# We use a named tuple rather than a full class, because any random name generation has
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# to be done with Puzzle's random number generator, and it's cleaner to not pass that around.
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PuzzleFile = namedtuple('PuzzleFile', ['path', 'handle', 'name', 'visible'])
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PuzzleFile.__doc__ = """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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class Puzzle:
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KNOWN_KEYS = [
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'answer',
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'author',
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'file',
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'hidden',
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'name'
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'resource',
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'summary'
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]
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REQUIRED_KEYS = [
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'author',
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'answer',
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]
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SINGULAR_KEYS = [
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'name'
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]
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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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def __init__(self, category_seed, path=None, points=None):
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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 path: An optional path to a puzzle directory. The point value for the puzzle is taken
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from the puzzle directories name (it must be an integer greater than zero).
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Within this directory, we expect:
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(optional) A puzzle.moth file in RFC2822 format. The puzzle will get its attributes
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from the headers, and the body will be the puzzle description in
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Markdown format.
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(optional) A puzzle.py file. This is expected to have a callable called make
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that takes a single positional argument (this puzzle object).
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This callable can then do whatever it needs to with this object.
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:param points: The point value of the puzzle. Mutually exclusive with path.
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If neither of the above are given, the point value for the puzzle will have to
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be set at instantiation.
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For puzzle attributes, this class acts like a dictionary that in most cases assigns
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always returns a list. Certain keys, however behave differently:
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- Keys in Puzzle.SINGULAR_KEYS can only have one value, and writing to these overwrites
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that value.
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- The keys 'hidden', 'file', and 'resource' all create a new PuzzleFile object that
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gets added under the 'files' key.
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- The 'answer' also adds a new hash under the the 'hash' key.
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"""
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super().__init__()
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if (points is None and path is None) or (points is not None and path is not None):
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raise ValueError("Either points or path must be set, but not both.")
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self._dict = defaultdict(lambda: [])
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if os.path.isdir(path):
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self._puzzle_dir = path
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else:
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self._puzzle_dir = None
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self.message = bytes(random.choice(messageChars) for i in range(20))
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self.body = ''
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# This defaults to a dict, not a list like most things
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self._dict['files'] = {}
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# A list of temporary files we've created that will need to be deleted.
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self._temp_files = []
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if path is not None:
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if not os.path.isdir(path):
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raise ValueError("No such directory: {}".format(path))
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pathname = os.path.split(path)[-1]
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try:
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self.points = int(pathname)
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except ValueError:
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raise ValueError("Directory name must be a point value: {}".format(path))
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elif points is not None:
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self.points = points
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self._seed = category_seed * self.points
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self.rand = random.Random(self._seed)
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if path is not None:
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files = os.listdir(path)
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if 'puzzle.moth' in files:
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self._read_config(open(os.path.join(path, 'puzzle.moth')))
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if 'puzzle.py' in files:
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# Good Lord this is dangerous as fuck.
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loader = SourceFileLoader('puzzle_mod', os.path.join(path, 'puzzle.py'))
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puzzle_mod = loader.load_module()
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if hasattr(puzzle_mod, 'make'):
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self.body = '# `puzzle.body` was not set by the `make` function'
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puzzle_mod.make(self)
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else:
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self.body = '# `puzzle.py` does not define a `make` function'
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def cleanup(self):
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"""Cleanup any outstanding temporary files."""
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for path in self._temp_files:
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if os.path.exists(path):
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try:
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os.unlink(path)
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except OSError:
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pass
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def _read_config(self, stream):
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"""Read a configuration file (ISO 2822)"""
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body = []
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header = True
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for line in stream:
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if header:
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line = line.strip()
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if not line.strip():
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header = False
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continue
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key, val = line.split(':', 1)
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val = val.strip()
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self[key] = val
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else:
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body.append(line)
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self.body = ''.join(body)
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def random_hash(self):
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"""Create a random hash from our number generator suitable for use as a filename."""
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return hashlib.sha1(str(self.rand.random()).encode('ascii')).digest()
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def _puzzle_file(self, path, name, visible=True):
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"""Make a puzzle file instance for the given file. To add files as you would in the config
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file (to 'file', 'hidden', or 'resource', simply assign to that keyword in the object:
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puzzle['file'] = 'some_file.txt'
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puzzle['hidden'] = 'some_hidden_file.txt'
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puzzle['resource'] = 'some_file_in_the_category_resource_directory_omg_long_name.txt'
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:param path: The path to the file
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:param name: The name of the file. If set to None, the published file will have
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a random hash as a name and have visible set to False.
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:return:
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"""
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# Make sure it actually exists.
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if not os.path.exists(path):
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raise ValueError("Included file {} does not exist.".format(path))
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file = open(path, 'rb')
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return PuzzleFile(path=path, handle=file, name=name, visible=visible)
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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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if name is None:
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name = self.random_hash()
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file = tempfile.NamedTemporaryFile(mode='w+b', delete=False)
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file_read = open(file.name, 'rb')
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self._dict['files'][name] = PuzzleFile(path=file.name, handle=file_read,
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name=name, visible=visible)
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return file
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def make_handle_file(self, handle, name, visible=True):
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"""Add a file to the puzzle from a file handle.
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:param handle: A file object or equivalent.
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:param name: The name of the file in the final puzzle.
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:param visible: Whether or not it's visible.
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:return: None
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"""
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def __setitem__(self, key, value):
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"""Set a value for this puzzle, as if it were set in the config file. Most values default
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being added to a list. Files (regardless of type) go in a dict under ['files']. Keys
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in Puzzle.SINGULAR_KEYS are single values that get overwritten with subsequent assignments.
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Only keys in Puzzle.KNOWN_KEYS are accepted.
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:param key:
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:param value:
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:return:
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"""
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key = key.lower()
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if key in ('file', 'resource', 'hidden') and self._puzzle_dir is None:
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raise KeyError("Cannot set a puzzle file for single file puzzles.")
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if key == 'answer':
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# Handle adding answers to the puzzle
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self._dict['hash'].append(djb2hash(value.encode('utf8')))
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self._dict['answer'].append(value)
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elif key == 'file':
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# Handle adding files to the puzzle
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path = os.path.join(self._puzzle_dir, 'files', value)
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self._dict['files'][value] = self._puzzle_file(path, value)
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elif key == 'resource':
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# Handle adding category files to the puzzle
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path = os.path.join(self._puzzle_dir, '../res', value)
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self._dict['files'].append(self._puzzle_file(path, value))
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elif key == 'hidden':
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# Handle adding secret, 'hidden' files to the puzzle.
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path = os.path.join(self._puzzle_dir, 'files', value)
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name = self.random_hash()
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self._dict['files'].append(self._puzzle_file(path, name, visible=False))
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elif key in self.SINGULAR_KEYS:
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# These keys can only have one value
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self._dict[key] = value
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elif key in self.KNOWN_KEYS:
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self._dict[key].append(value)
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else:
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raise KeyError("Invalid Attribute: {}".format(key))
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def __getitem__(self, item):
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return self._dict[item.lower()]
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def make_answer(self, word_count, 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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answer = sep.join(self.rand.sample(self.ANSWER_WORDS, word_count))
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self['answer'] = answer
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return answer
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def htmlify(self):
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"""Format and return the markdown for the puzzle body."""
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return mistune.markdown(self.body)
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def publish(self):
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obj = {
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'author': self['author'],
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'hashes': self['hashes'],
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'body': self.htmlify(),
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}
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return obj
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def secrets(self):
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obj = {
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'answers': self['answers'],
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'summary': self['summary'],
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}
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return obj
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description='Build a puzzle category')
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parser.add_argument('puzzledir', nargs='+', help='Directory of puzzle source')
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args = parser.parse_args()
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for puzzledir in args.puzzledir:
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puzzles = {}
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secrets = {}
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for puzzlePath in glob.glob(os.path.join(puzzledir, "*.moth")):
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filename = os.path.basename(puzzlePath)
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points, ext = os.path.splitext(filename)
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points = int(points)
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puzzle = Puzzle(puzzlePath, "test")
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puzzles[points] = puzzle
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for points in sorted(puzzles):
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puzzle = puzzles[points]
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print(puzzle.secrets())
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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.pointvals = []
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for fpath in glob.glob(os.path.join(path, "[0-9]*")):
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pn = os.path.basename(fpath)
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points = int(pn)
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self.pointvals.append(points)
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self.pointvals.sort()
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def puzzle(self, points):
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path = os.path.join(self.path, str(points))
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return Puzzle(self.seed, path=path)
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def puzzles(self):
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for points in self.pointvals:
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yield self.puzzle(points)
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