mirror of https://github.com/dirtbags/moth.git
287 lines
9.0 KiB
Python
287 lines
9.0 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 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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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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@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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# 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 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.files = {}
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self.body = io.StringIO()
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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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for line in stream:
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if header:
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line = line.strip()
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if not line:
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header = False
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continue
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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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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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self.answers.append(val)
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elif key == 'file':
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parts = val.split()
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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]
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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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else:
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raise ValueError("Unrecognized header field: {}".format(key))
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else:
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self.body.write(line)
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def read_directory(self, path):
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try:
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fn = os.path.join(path, "puzzle.py")
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loader = importlib.machinery.SourceFileLoader('puzzle_mod', fn)
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puzzle_mod = loader.load_module()
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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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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(''.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 hashes(self):
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"Return a list of answer hashes"
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return [djb2hash(a.encode('utf-8')) 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.pointvals = []
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self.catmod = None
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if os.path.exists(os.path.join(path, 'category.py')):
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with pushd(path):
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loader = importlib.machinery.SourceFileLoader('catmod', 'category.py')
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self.catmod = loader.load_module()
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self.pointvals.extend(self.catmod.points)
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else:
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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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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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