53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
from __future__ import print_function
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import sys, os, json
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from binascii import unhexlify
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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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direct_hints = transit_receiver.get_direct_hints()
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mydata = json.dumps({
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"transit": {
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"direct_connection_hints": direct_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 = unhexlify(file_data["key"].encode("ascii"))
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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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print("calling tr.set_transit_key()")
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transit_receiver.set_transit_key(tdata["key"])
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transit_receiver.add_sender_direct_hints(tdata["direct_connection_hints"])
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transit_receiver.add_sender_relay_hints(tdata["relay_connection_hints"])
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skt = transit_receiver.establish_connection()
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encrypted = skt.recv(encrypted_filesize)
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if len(encrypted) != encrypted_filesize:
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print("Connection dropped before file received")
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sys.exit(1)
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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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assert os.path.dirname(target) == here
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assert not os.path.exists(target)
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with open(target, "wb") as f:
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f.write(decrypted)
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print("%s written" % filename)
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