171 lines
5.7 KiB
Python
171 lines
5.7 KiB
Python
import os
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import io
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import sys
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import yaml
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import string
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import hashlib
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from collections import defaultdict
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from Cryptodome.Cipher import AES
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from Cryptodome.Util import Padding
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from aiohttp import web
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class AttrDict(dict):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.__dict__ = self
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def update(self, *d, **kwargs):
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for key, val in (d[0] if d else kwargs).items():
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setattr(self, key, val)
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def __getattr__(self, item):
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return self.setdefault(item, AttrDict())
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def cast_to_ad(d):
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if not isinstance(d, AttrDict):
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d = AttrDict(d)
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for k, v in dict(d.items()).items():
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if " " in k:
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del d[k]
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d[k.replace(" ", "_")] = v
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if isinstance(v, dict):
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d[k] = cast_to_ad(v)
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return d
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def sizeof_fmt(num, suffix='B'):
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for unit in ['', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi']:
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if abs(num) < 1024.0:
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return f"{num:3.1f}{unit}{suffix}"
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num /= 1024.0
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return f"{num:.1f}Yi{suffix}"
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async def prepare(_, handler):
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async def prepare_handler(req):
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if 'acc' not in req.match_info:
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return web.Response(text='internal server error', status=500)
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return await handler(req, req.match_info["acc"], file_db[req.match_info["acc"]])
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return prepare_handler
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async def handle_upload(req, acc, acc_db):
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if conf.auth and req.headers.get('auth') not in conf.auth_tokens:
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return web.Response(text='access denied', status=403)
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reader = await req.multipart()
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file = await reader.next()
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filename = os.path.basename(file.filename)
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if not os.path.isdir(f'{conf.data_path}/{acc}'):
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os.mkdir(f'{conf.data_path}/{acc}')
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for _ in range(100):
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hb = os.urandom(conf.url_hash_len//2)
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h = hb.hex()
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if h not in acc_db:
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break
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else:
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return web.Response(text='server full', status=500)
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acc_db[h] = filename
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local_fname = f'{conf.data_path}/{acc}/{h}_{filename}'
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ext = os.path.splitext(filename)[1] if conf.show_ext else ''
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os.fdopen(os.open(local_fname, os.O_WRONLY | os.O_CREAT, 0o600)).close()
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try:
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valid_file = await recv_file(file, local_fname)
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except IOError:
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return web.Response(text='internal io error', status=500)
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if valid_file:
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c = AES.new(conf.del_crypt_key, AES.MODE_CBC)
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hb = Padding.pad(hb, AES.block_size)
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del_h = (c.encrypt(hb) + c.iv).hex()
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return web.Response(text=f'{conf.protocol}://{acc}{conf.prefix}/{h[:conf.url_hash_len]}{ext}\n'
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f'{conf.protocol}://{acc}{conf.prefix}/del/{del_h}')
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os.unlink(local_fname)
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del acc_db[h]
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return web.Response(text=f'file is bigger than {sizeof_fmt(conf.max_filesize)}', status=413)
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async def recv_file(file, local_fname):
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size = 0
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with io.BufferedWriter(open(local_fname, 'wb')) as f:
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while True:
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chunk = await file.read_chunk()
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if not chunk:
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return True
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size += len(chunk)
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if size > conf.max_filesize:
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return False
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f.write(chunk)
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async def handle_delete(req, acc, acc_db):
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chashiv = req.match_info.get('hash', 'x')
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if not set(chashiv).issubset(valid_hash_chars) or len(chashiv) != 64:
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return web.Response(text='invalid delete link', status=400)
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chashiv = bytes.fromhex(chashiv)
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c = AES.new(conf.del_crypt_key, AES.MODE_CBC, iv=chashiv[AES.block_size:])
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fhash = c.decrypt(chashiv[:AES.block_size])
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try:
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fhash = Padding.unpad(fhash, AES.block_size).hex()
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except ValueError:
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pass
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if fhash not in acc_db or len(fhash) == 32:
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return web.Response(text='this file doesn\'t exist on the server', status=404)
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os.unlink(f"{conf.data_path}/{acc}/{fhash}_{acc_db[fhash]}")
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del acc_db[fhash]
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return web.Response(text='file deleted')
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async def handle_download(req, acc, acc_db):
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fhash = req.match_info.get('hash', '').split('.', 1)[0]
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if fhash not in acc_db:
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return web.Response(text='file not found', status=404)
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return web.FileResponse(f"{conf.data_path}/{acc}/{fhash}_{acc_db[fhash]}", headers={
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'CONTENT-DISPOSITION': f'inline;filename="{acc_db[fhash]}"'
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})
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def main():
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if not os.path.isdir(conf.data_path):
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os.mkdir(conf.data_path)
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for acc in os.listdir(conf.data_path):
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if not os.path.isdir(f'{conf.data_path}/{acc}'):
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continue
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for file in os.listdir(f"{conf.data_path}/{acc}"):
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if "_" in file:
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fhash, fname = file.split('_', 1)
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file_db[acc][fhash] = fname
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app = web.Application(middlewares=[prepare])
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app.router.add_post(conf.prefix + '/post/{acc}', handle_upload)
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app.router.add_get(conf.prefix + '/del/{hash}/{acc}', handle_delete)
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app.router.add_get(conf.prefix + '/{hash}/{acc}', handle_download)
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web.run_app(app, port=80)
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if __name__ == '__main__':
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valid_hash_chars = set(string.hexdigits)
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file_db = defaultdict(dict)
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confname = sys.argv[1] if sys.argv[1:] and os.path.isfile(sys.argv[1]) else 'config.yaml'
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with open(confname) as cf:
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conf = cast_to_ad(yaml.load(cf))
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if conf.url_hash_len > 31:
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raise ValueError('url_hash_len can\'t be bigger than 31')
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if not set(conf.max_filesize.replace(' ', ''))\
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.issubset(valid_hash_chars | {'*'}):
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raise ValueError('max_filsize only can contain numbers and *')
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conf.max_filesize = eval(conf.max_filesize)
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conf.auth_tokens = set(conf.tokens)
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conf.prefix = conf.prefix.strip("/")
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if conf.prefix:
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conf.prefix = f'/{conf.prefix}'
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conf.del_crypt_key = hashlib.md5(conf.del_crypt_key.encode()).digest()[:16]
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main()
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