moth/puzzles.py

272 lines
9.4 KiB
Python

#!/usr/bin/python3
import argparse
from collections import defaultdict, namedtuple
import glob
import hashlib
from importlib.machinery import SourceFileLoader
import mistune
import os
import random
import tempfile
messageChars = b'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
def djb2hash(buf):
h = 5381
for c in buf:
h = ((h * 33) + c) & 0xffffffff
return h
# We use a named tuple rather than a full class, because any random name generation has
# to be done with Puzzle's random number generator, and it's cleaner to not pass that around.
PuzzleFile = namedtuple('PuzzleFile', ['path', 'handle', 'name', 'visible'])
class Puzzle:
KNOWN_KEYS = [
'answer',
'author',
'file',
'hidden',
'name'
'resource',
'summary'
]
REQUIRED_KEYS = [
'author',
'answer',
'points'
]
SINGULAR_KEYS = [
'name'
]
# Get a big list of clean words for our answer file.
ANSWER_WORDS = [w.strip() for w in open(os.path.join(os.path.dirname(__file__),
'answer_words.txt'))]
def __init__(self, path, category_seed):
"""Puzzle objects need a path to a puzzle description (
:param path:
:param category_seed:
"""
super().__init__()
self._dict = defaultdict(lambda: [])
if os.path.isdir(path):
self._puzzle_dir = path
else:
self._puzzle_dir = None
self.message = bytes(random.choice(messageChars) for i in range(20))
self.body = ''
if not os.path.exists(path):
raise ValueError("No puzzle at path: {]".format(path))
elif os.path.isdir(path):
# Expected format is path/<points_int>.moth
pathname = os.path.split(path)[-1]
try:
self.points = int(pathname)
except ValueError:
pass
files = os.listdir(path)
if 'puzzle.moth' in files:
self._read_config(open(os.path.join(path, 'puzzle.moth')))
if 'puzzle.py' in files:
# Good Lord this is dangerous as fuck.
loader = SourceFileLoader('puzzle_mod', os.path.join(path, 'puzzle.py'))
puzzle_mod = loader.load_module()
if hasattr(puzzle_mod, 'make'):
puzzle_mod.make(self)
else:
raise ValueError("Unacceptable file type for puzzle at {}".format(path))
self._seed = hashlib.sha1(category_seed + bytes(self['points'])).digest()
self.rand = random.Random(self._seed)
# Set our 'files' as a dict, since we want register them uniquely by name.
self['files'] = dict()
# A list of temporary files we've created that will need to be deleted.
self._temp_files = []
def cleanup(self):
"""Cleanup any outstanding temporary files."""
for path in self._temp_files:
if os.path.exists(path):
try:
os.unlink(path)
except OSError:
pass
def _read_config(self, stream):
"""Read a configuration file (ISO 2822)"""
body = []
header = True
for line in stream:
if header:
line = line.strip()
if not line.strip():
header = False
continue
key, val = line.split(':', 1)
val = val.strip()
self[key] = val
else:
body.append(line)
self.body = ''.join(body)
def random_hash(self):
"""Create a random hash from our number generator suitable for use as a filename."""
return hashlib.sha1(str(self.rand.random()).encode('ascii')).digest()
def _puzzle_file(self, path, name, visible=True):
"""Make a puzzle file instance for the given file. To add files as you would in the config
file (to 'file', 'hidden', or 'resource', simply assign to that keyword in the object:
puzzle['file'] = 'some_file.txt'
puzzle['hidden'] = 'some_hidden_file.txt'
puzzle['resource'] = 'some_file_in_the_category_resource_directory_omg_long_name.txt'
:param path: The path to the file
:param name: The name of the file. If set to None, the published file will have
a random hash as a name and have visible set to False.
:return:
"""
# Make sure it actually exists.
if not os.path.exists(path):
raise ValueError("Included file {} does not exist.")
file = open(path, 'rb')
return PuzzleFile(path=path, handle=file, name=name, visible=visible)
def make_temp_file(self, name=None, mode='rw+b', visible=True):
"""Get a file object for adding dynamically generated data to the puzzle. When you're
done with this file, flush it, but don't close it.
:param name: The name of the file for links within the puzzle. If this is None, a name
will be generated for you.
:param mode: The mode under which
:param visible: Whether or not the file will be visible to the user.
:return: A file object for writing
"""
if name is None:
name = self.random_hash()
file = tempfile.NamedTemporaryFile(mode=mode, delete=False)
file_read = open(file.name, 'rb')
self._dict['files'][name] = PuzzleFile(path=file.name, handle=file_read,
name=name, visible=visible)
return file
def make_handle_file(self, handle, name, visible=True):
"""Add a file to the puzzle from a file handle.
:param handle: A file object or equivalent.
:param name: The name of the file in the final puzzle.
:param visible: Whether or not it's visible.
:return: None
"""
def __setitem__(self, key, value):
"""Set a value for this puzzle, as if it were set in the config file. Most values default
being added to a list. Files (regardless of type) go in a dict under ['files']. Keys
in Puzzle.SINGULAR_KEYS are single values that get overwritten with subsequent assignments.
Only keys in Puzzle.KNOWN_KEYS are accepted.
:param key:
:param value:
:return:
"""
key = key.lower()
if key in ('file', 'resource', 'hidden') and self._puzzle_dir is None:
raise KeyError("Cannot set a puzzle file for single file puzzles.")
if key == 'answer':
# Handle adding answers to the puzzle
self._dict['hashes'].append(djb2hash(value.encode('utf8')))
self._dict['answers'].append(value)
elif key == 'file':
# Handle adding files to the puzzle
path = os.path.join(self._puzzle_dir, 'files', value)
self._dict['files'][value] = self._puzzle_file(path, value)
elif key == 'resource':
# Handle adding category files to the puzzle
path = os.path.join(self._puzzle_dir, '../res', value)
self._dict['files'].append(self._puzzle_file(path, value))
elif key == 'hidden':
# Handle adding secret, 'hidden' files to the puzzle.
path = os.path.join(self._puzzle_dir, 'files', value)
name = self.random_hash()
self._dict['files'].append(self._puzzle_file(path, name, visible=False))
elif key in self.SINGULAR_KEYS:
# These keys can only have one value
self._dict[key] = value
elif key in self.KNOWN_KEYS:
self._dict[key].append(value)
else:
raise KeyError("Invalid Attribute: {}".format(key))
def __getitem__(self, item):
return self._dict[item.lower()]
def make_answer(self, word_count, sep=b' '):
"""Generate and return a new answer. It's automatically added to the puzzle answer list.
:param int word_count: The number of words to include in the answer.
:param str|bytes sep: The word separator.
:returns: The answer bytes
"""
if type(sep) == str:
sep = sep.encode('ascii')
answer = sep.join(self.rand.sample(self.ANSWER_WORDS, word_count))
self['answer'] = answer
return answer
def htmlify(self):
"""Format and return the markdown for the puzzle body."""
return mistune.markdown(self.body)
def publish(self):
obj = {
'author': self['author'],
'hashes': self['hashes'],
'body': self.htmlify(),
}
return obj
def secrets(self):
obj = {
'answers': self['answers'],
'summary': self['summary'],
}
return obj
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Build a puzzle category')
parser.add_argument('puzzledir', nargs='+', help='Directory of puzzle source')
args = parser.parse_args()
for puzzledir in args.puzzledir:
puzzles = {}
secrets = {}
for puzzlePath in glob.glob(os.path.join(puzzledir, "*.moth")):
filename = os.path.basename(puzzlePath)
points, ext = os.path.splitext(filename)
points = int(points)
puzzle = Puzzle(puzzlePath, "test")
puzzles[points] = puzzle
for points in sorted(puzzles):
puzzle = puzzles[points]
print(puzzle.secrets())