diff options
Diffstat (limited to 'server.py')
-rw-r--r-- | server.py | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/server.py b/server.py new file mode 100644 index 0000000..9df3546 --- /dev/null +++ b/server.py @@ -0,0 +1,46 @@ +#!/usr/bin/env python3 + +import re +import os + +from flask import Flask, abort, request, Response + +import filecrypt + +app = Flask(__name__) +BASE64_RE = re.compile('^[A-Za-z0-9+-_]+=*$') + +@app.route('/<file_id>/<token>/<filename>') +def download(file_id, token, filename): + if not BASE64_RE.match(file_id) or len(file_id) != filecrypt.FILE_ID_LENGTH: + abort(400, 'Invalid file ID format') + if not BASE64_RE.match(token) or len(token) != filecrypt.TOKEN_LENGTH: + abort(400, 'Invalid token format') + + path = f'{file_id}.enc' + size = filecrypt.payload_size(path) + + range_header = re.match('^bytes=([0-9]+)-([0-9]*)$', request.headers.get('Range', '')) + if not range_header: + response = Response( + filecrypt.decrypt_generator(path, token), + mimetype='application/octet-stream') + response.headers['Content-Length'] = size + else: + range_start, range_end = range_header.groups() + range_start = int(range_start) + range_end = int(range_end) if range_end else size-1 + if range_start < 0 or range_end >= size or range_start >= range_end: + abort(416) + + response = Response( + filecrypt.decrypt_generator(path, token, seek=range_start, end=range_end), + status = 206, + mimetype='application/octet-stream') + response.headers['Content-Range'] = f'bytes {range_start}-{range_end}/{size}' + response.headers['Content-Length'] = range_end - range_start + 1 + + response.headers['Accept-Ranges'] = 'bytes' + response.headers['Content-Disposition'] = f'attachment {filename}' + return response + |