70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
from __future__ import print_function
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import sys, os, json
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from nacl.secret import SecretBox
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from wormhole.blocking.transcribe import Receiver
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from wormhole.blocking.transit import TransitReceiver
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APPID = "lothar.com/wormhole/file-xfer"
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# we're receiving
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transit_receiver = TransitReceiver()
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mydata = json.dumps({
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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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r = Receiver(APPID, mydata)
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r.set_code(r.input_code("Enter receive-file wormhole code: "))
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data = json.loads(r.get_data().decode("utf-8"))
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#print("their data: %r" % (data,))
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file_data = data["file"]
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xfer_key = r.derive_key(APPID+"/xfer-key", SecretBox.KEY_SIZE)
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filename = os.path.basename(file_data["filename"]) # unicode
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filesize = file_data["filesize"]
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encrypted_filesize = filesize + SecretBox.NONCE_SIZE+16
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# now receive the rest of the owl
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tdata = data["transit"]
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transit_key = r.derive_key(APPID+"/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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skt = transit_receiver.establish_connection()
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print("Receiving %d bytes.." % filesize)
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encrypted = b""
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while len(encrypted) < encrypted_filesize:
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more = skt.recv(encrypted_filesize - len(encrypted))
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if not more:
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print("Connection dropped before full file received")
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print("got %d bytes, wanted %d" % (len(encrypted), encrypted_filesize))
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sys.exit(1)
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encrypted += more
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assert len(encrypted) == encrypted_filesize
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decrypted = SecretBox(xfer_key).decrypt(encrypted)
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# only write to the current directory, and never overwrite anything
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here = os.path.abspath(os.getcwd())
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target = os.path.abspath(os.path.join(here, filename))
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if os.path.dirname(target) != here:
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print("Error: suggested filename (%s) would be outside current directory"
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% (filename,))
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skt.send("bad filename\n")
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skt.close()
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sys.exit(1)
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if os.path.exists(target):
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print("Error: refusing to overwrite existing file %s" % (filename,))
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skt.send("file already exists\n")
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skt.close()
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sys.exit(1)
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with open(target, "wb") as f:
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f.write(decrypted)
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print("Received file written to %s" % filename)
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skt.send("ok\n")
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skt.close()
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sys.exit(0)
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