#!/usr/bin/python3 import argparse import contextlib import glob import hashlib import io import importlib.machinery import mistune import os import random import string import tempfile messageChars = b'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' def djb2hash(buf): h = 5381 for c in buf: h = ((h * 33) + c) & 0xffffffff return h @contextlib.contextmanager def pushd(newdir): curdir = os.getcwd() os.chdir(newdir) try: yield finally: os.chdir(curdir) # 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'))] class PuzzleFile: """A file associated with a puzzle. path: The path to the original input file. May be None (when this is created from a file handle and there is no original input. handle: A File-like object set to read the file from. You should be able to read straight from it without having to seek to the beginning of the file. name: The name of the output file. visible: A boolean indicating whether this file should visible to the user. If False, the file is still expected to be accessible, but it's path must be known (or figured out) to retrieve it.""" def __init__(self, stream, name, visible=True): self.stream = stream self.name = name self.visible = visible class Puzzle: def __init__(self, category_seed, points): """A MOTH Puzzle. :param category_seed: A byte string to use as a seed for random numbers for this puzzle. It is combined with the puzzle points. :param points: The point value of the puzzle. """ super().__init__() self.points = points self.summary = None self.authors = [] self.answers = [] self.files = {} self.body = io.StringIO() self.logs = [] self.randseed = category_seed * self.points self.rand = random.Random(self.randseed) def log(self, *vals): """Add a new log message to this puzzle.""" msg = ' '.join(str(v) for v in vals) self.logs.append(msg) def read_stream(self, stream): header = True for line in stream: if header: line = line.strip() if not line: header = False continue key, val = line.split(':', 1) key = key.lower() val = val.strip() if key == 'author': self.authors.append(val) elif key == 'summary': self.summary = val elif key == 'answer': self.answers.append(val) elif key == 'file': parts = val.split() name = parts[0] hidden = False stream = open(name, 'rb') try: name = parts[1] hidden = parts[2] except IndexError: pass self.files[name] = PuzzleFile(stream, name, not hidden) else: raise ValueError("Unrecognized header field: {}".format(key)) else: self.body.write(line) def read_directory(self, path): try: fn = os.path.join(path, "puzzle.py") loader = importlib.machinery.SourceFileLoader('puzzle_mod', fn) puzzle_mod = loader.load_module() except FileNotFoundError: puzzle_mod = None with pushd(path): if puzzle_mod: puzzle_mod.make(self) else: with open('puzzle.moth') as f: self.read_stream(f) def random_hash(self): """Create a file basename (no extension) with our number generator.""" return ''.join(self.rand.choice(string.ascii_lowercase) for i in range(8)) def make_temp_file(self, name=None, 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 visible: Whether or not the file will be visible to the user. :return: A file object for writing """ stream = tempfile.TemporaryFile() self.add_stream(stream, name, visible) return stream def add_stream(self, stream, name=None, visible=True): if name is None: name = self.random_hash() self.files[name] = PuzzleFile(stream, name, visible) def add_file(self, filename, visible=True): fd = open(filename, 'rb') name = os.path.basename(filename) self.add_stream(fd, name=name, visible=visible) def randword(self): """Return a randomly-chosen word""" return self.rand.choice(ANSWER_WORDS) def make_answer(self, word_count=4, sep=' '): """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 string """ words = [self.randword() for i in range(word_count)] answer = sep.join(words) self.answers.append(answer) return answer hexdump_stdch = stdch = ( '················' '················' ' !"#$%&\'()*+,-./' '0123456789:;<=>?' '@ABCDEFGHIJKLMNO' 'PQRSTUVWXYZ[\]^_' '`abcdefghijklmno' 'pqrstuvwxyz{|}~·' '················' '················' '················' '················' '················' '················' '················' '················' ) def hexdump(self, buf, charset=hexdump_stdch, gap=('�', '⌷')): hexes, chars = [], [] out = [] for b in buf: if len(chars) == 16: out.append((hexes, chars)) hexes, chars = [], [] if b is None: h, c = gap else: h = '{:02x}'.format(b) c = charset[b] chars.append(c) hexes.append(h) out.append((hexes, chars)) offset = 0 elided = False lastchars = None self.body.write('
')
        for hexes, chars in out:
            if chars == lastchars:
                if not elided:
                    self.body.write('*\n')
                    elided = True
                continue
            lastchars = chars[:]
            elided = False

            pad = 16 - len(chars)
            hexes += ['  '] * pad

            self.body.write('{:08x}  '.format(offset))
            self.body.write(' '.join(hexes[:8]))
            self.body.write('  ')
            self.body.write(' '.join(hexes[8:]))
            self.body.write('  |')
            self.body.write(''.join(chars))
            self.body.write('|\n')
            offset += len(chars)
        self.body.write('{:08x}\n'.format(offset))
        self.body.write('
') def get_authors(self): return self.authors or [self.author] def get_body(self): return self.body.getvalue() def html_body(self): """Format and return the markdown for the puzzle body.""" return mistune.markdown(self.get_body(), escape=False) def hashes(self): "Return a list of answer hashes" return [djb2hash(a.encode('utf-8')) for a in self.answers] class Category: def __init__(self, path, seed): self.path = path self.seed = seed self.pointvals = [] self.catmod = None if os.path.exists(os.path.join(path, 'category.py')): with pushd(path): loader = importlib.machinery.SourceFileLoader('catmod', 'category.py') self.catmod = loader.load_module() self.pointvals.extend(self.catmod.points) else: for fpath in glob.glob(os.path.join(path, "[0-9]*")): pn = os.path.basename(fpath) points = int(pn) self.pointvals.append(points) self.pointvals.sort() def puzzle(self, points): puzzle = Puzzle(self.seed, points) path = os.path.join(self.path, str(points)) if self.catmod: with pushd(self.path): self.catmod.make(points, puzzle) else: puzzle.read_directory(path) return puzzle def __iter__(self): for points in self.pointvals: yield self.puzzle(points)