121 lines
4.4 KiB
Python
121 lines
4.4 KiB
Python
from __future__ import print_function
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import os, sys, json, binascii, six
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from ..errors import handle_server_error
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APPID = u"lothar.com/wormhole/text-or-file-xfer"
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@handle_server_error
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def receive(args):
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# we're receiving text, or a file
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from ..blocking.transcribe import Wormhole, WrongPasswordError
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from ..blocking.transit import TransitReceiver, TransitError
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from .progress import start_progress, update_progress, finish_progress
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assert isinstance(args.relay_url, type(u""))
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with Wormhole(APPID, args.relay_url) as w:
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if args.zeromode:
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assert not args.code
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args.code = u"0-"
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code = args.code
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if not code:
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code = w.input_code("Enter receive wormhole code: ", args.code_length)
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w.set_code(code)
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if args.verify:
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verifier = binascii.hexlify(w.get_verifier()).decode("ascii")
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print("Verifier %s." % verifier)
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try:
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them_bytes = w.get_data()
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except WrongPasswordError as e:
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print("ERROR: " + e.explain(), file=sys.stderr)
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return 1
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them_d = json.loads(them_bytes.decode("utf-8"))
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if "error" in them_d:
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print("ERROR: " + them_d["error"], file=sys.stderr)
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return 1
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if "message" in them_d:
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# we're receiving a text message
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print(them_d["message"])
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data = json.dumps({"message_ack": "ok"}).encode("utf-8")
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w.send_data(data)
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return 0
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if not "file" in them_d:
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print("I don't know what they're offering\n")
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print(them_d)
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return 1
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if "error" in them_d:
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print("ERROR: " + data["error"], file=sys.stderr)
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return 1
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file_data = them_d["file"]
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# the basename() is intended to protect us against
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# "~/.ssh/authorized_keys" and other attacks
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filename = os.path.basename(file_data["filename"]) # unicode
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filesize = file_data["filesize"]
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# get confirmation from the user before writing to the local directory
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if os.path.exists(filename):
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print("Error: refusing to overwrite existing file %s" % (filename,))
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data = json.dumps({"error": "file already exists"}).encode("utf-8")
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w.send_data(data)
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return 1
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print("Receiving file (%d bytes) into: %s" % (filesize, filename))
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while True and not args.accept_file:
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ok = six.moves.input("ok? (y/n): ")
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if ok.lower().startswith("y"):
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break
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print("transfer rejected", file=sys.stderr)
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data = json.dumps({"error": "transfer rejected"}).encode("utf-8")
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w.send_data(data)
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return 1
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transit_receiver = TransitReceiver(args.transit_helper)
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data = json.dumps({
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"file_ack": "ok",
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"transit": {
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"direct_connection_hints": transit_receiver.get_direct_hints(),
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"relay_connection_hints": transit_receiver.get_relay_hints(),
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},
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}).encode("utf-8")
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w.send_data(data)
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# now receive the rest of the owl
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tdata = them_d["transit"]
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transit_key = w.derive_key(APPID+u"/transit-key")
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transit_receiver.set_transit_key(transit_key)
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transit_receiver.add_their_direct_hints(tdata["direct_connection_hints"])
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transit_receiver.add_their_relay_hints(tdata["relay_connection_hints"])
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record_pipe = transit_receiver.connect()
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print("Receiving %d bytes for '%s' (%s).." % (filesize, filename,
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transit_receiver.describe()))
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tmp = filename + ".tmp"
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with open(tmp, "wb") as f:
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received = 0
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next_update = start_progress(filesize)
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while received < filesize:
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try:
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plaintext = record_pipe.receive_record()
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except TransitError:
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print()
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print("Connection dropped before full file received")
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print("got %d bytes, wanted %d" % (received, filesize))
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return 1
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f.write(plaintext)
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received += len(plaintext)
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next_update = update_progress(next_update, received, filesize)
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finish_progress(filesize)
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assert received == filesize
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os.rename(tmp, filename)
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print("Received file written to %s" % filename)
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record_pipe.send_record(b"ok\n")
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record_pipe.close()
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return 0
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