Removed demo code from this repo
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Teknique
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#!/usr/bin/env python
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"""A simple chat server using Veilid's DHT."""
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import argparse
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import asyncio
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import sys
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import config
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import veilid
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QUIT = "QUIT"
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NONCE_LENGTH = 24
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async def noop_callback(*args, **kwargs):
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"""In the real world, we'd use this to process interesting incoming events."""
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return
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async def chatter(
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router: veilid.api.RoutingContext,
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crypto_system: veilid.CryptoSystem,
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key: veilid.TypedKey,
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secret: veilid.SharedSecret,
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send_subkey: veilid.ValueSubkey,
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recv_subkey: veilid.ValueSubkey,
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):
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"""Read input, write it to the DHT, and print the response from the DHT."""
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last_seq = -1
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async def encrypt(cleartext: str) -> bytes:
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"""Encrypt the message with the shared secret and a random nonce."""
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nonce = await crypto_system.random_nonce()
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encrypted = await crypto_system.crypt_no_auth(cleartext.encode(), nonce, secret)
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return nonce.to_bytes() + encrypted
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async def decrypt(payload: bytes) -> str:
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"""Decrypt the payload with the shared secret and the payload's nonce."""
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nonce = veilid.Nonce.from_bytes(payload[:NONCE_LENGTH])
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encrypted = payload[NONCE_LENGTH:]
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cleartext = await crypto_system.crypt_no_auth(encrypted, nonce, secret)
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return cleartext.decode()
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# Prime the pumps. Especially when starting the conversation, this
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# causes the DHT key to propagate to the network.
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await router.set_dht_value(key, send_subkey, await encrypt("Hello from the world!"))
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while True:
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try:
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msg = input("SEND> ")
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except EOFError:
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# Cat got your tongue? Hang up.
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print("Closing the chat.")
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await router.set_dht_value(key, send_subkey, await encrypt(QUIT))
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return
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# Write the input message to the DHT key.
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await router.set_dht_value(key, send_subkey, await encrypt(msg))
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# In the real world, don't do this. People may tease you for it.
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# This is meant to be easy to understand for demonstration
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# purposes, not a great pattern. Instead, you'd want to use the
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# callback function to handle events asynchronously.
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while True:
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# Try to get an updated version of the receiving subkey.
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resp = await router.get_dht_value(key, recv_subkey, True)
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if resp is None:
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continue
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# If the other party hasn't sent a newer message, try again.
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if resp.seq == last_seq:
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continue
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msg = await decrypt(resp.data)
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if msg == QUIT:
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print("Other end closed the chat.")
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return
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print(f"RECV< {msg}")
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last_seq = resp.seq
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break
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async def start(host: str, port: int, name: str):
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"""Begin a conversation with a friend."""
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conn = await veilid.json_api_connect(host, port, noop_callback)
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keys = config.read_keys()
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my_keypair = keys["self"]
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their_key = keys["peers"][name]
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members = [
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veilid.DHTSchemaSMPLMember(my_keypair.key(), 1),
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veilid.DHTSchemaSMPLMember(their_key, 1),
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]
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router = await (await conn.new_routing_context()).with_privacy()
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crypto_system = await conn.get_crypto_system(veilid.CryptoKind.CRYPTO_KIND_VLD0)
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async with crypto_system, router:
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secret = await crypto_system.cached_dh(their_key, my_keypair.secret())
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record = await router.create_dht_record(veilid.DHTSchema.smpl(0, members))
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print(f"New chat key: {record.key}")
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print("Give that to your friend!")
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# Close this key first. We'll reopen it for writing with our saved key.
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await router.close_dht_record(record.key)
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await router.open_dht_record(record.key, my_keypair)
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try:
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# Write to the 1st subkey and read from the 2nd.
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await chatter(router, crypto_system, record.key, secret, 0, 1)
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finally:
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await router.close_dht_record(record.key)
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await router.delete_dht_record(record.key)
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async def respond(host: str, port: int, name: str, key: str):
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"""Reply to a friend's chat."""
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conn = await veilid.json_api_connect(host, port, noop_callback)
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keys = config.read_keys()
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my_keypair = keys["self"]
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their_key = keys["peers"][name]
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router = await (await conn.new_routing_context()).with_privacy()
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crypto_system = await conn.get_crypto_system(veilid.CryptoKind.CRYPTO_KIND_VLD0)
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async with crypto_system, router:
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secret = await crypto_system.cached_dh(their_key, my_keypair.secret())
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await router.open_dht_record(key, my_keypair)
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# As the responder, we're writing to the 2nd subkey and reading from the 1st.
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await chatter(router, crypto_system, key, secret, 1, 0)
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async def keygen(host: str, port: int):
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"""Generate a keypair."""
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conn = await veilid.json_api_connect(host, port, noop_callback)
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crypto_system = await conn.get_crypto_system(veilid.CryptoKind.CRYPTO_KIND_VLD0)
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async with crypto_system:
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my_keypair = await crypto_system.generate_key_pair()
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keys = config.read_keys()
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if keys["self"]:
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print("You already have a keypair.")
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sys.exit(1)
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keys["self"] = my_keypair
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config.write_keys(keys)
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print(f"Your new public key is {my_keypair.key()}. Share it with your friends!")
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async def add_friend(host: str, port: int, name: str, pubkey: str):
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"""Add a friend's public key."""
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keys = config.read_keys()
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keys["peers"][name] = pubkey
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config.write_keys(keys)
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async def clean(host: str, port: int, key: str):
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"""Delete a DHT key."""
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conn = await veilid.json_api_connect(host, port, noop_callback)
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router = await (await conn.new_routing_context()).with_privacy()
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async with router:
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await router.close_dht_record(key)
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await router.delete_dht_record(key)
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def handle_command_line(arglist: list[str]):
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"""Process the command line.
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This isn't the interesting part."""
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parser = argparse.ArgumentParser(description="Veilid chat demonstration")
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parser.add_argument("--host", default="localhost", help="Address of the Veilid server host.")
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parser.add_argument("--port", type=int, default=5959, help="Port of the Veilid server.")
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subparsers = parser.add_subparsers(required=True)
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cmd_start = subparsers.add_parser("start", help=start.__doc__)
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cmd_start.add_argument("name", help="Your friend's name")
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cmd_start.set_defaults(func=start)
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cmd_respond = subparsers.add_parser("respond", help=respond.__doc__)
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cmd_respond.add_argument("name", help="Your friend's name")
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cmd_respond.add_argument("key", help="The chat's DHT key")
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cmd_respond.set_defaults(func=respond)
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cmd_keygen = subparsers.add_parser("keygen", help=keygen.__doc__)
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cmd_keygen.set_defaults(func=keygen)
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cmd_add_friend = subparsers.add_parser("add-friend", help=add_friend.__doc__)
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cmd_add_friend.add_argument("name", help="Your friend's name")
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cmd_add_friend.add_argument("pubkey", help="Your friend's public key")
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cmd_add_friend.set_defaults(func=add_friend)
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cmd_clean = subparsers.add_parser("clean", help=clean.__doc__)
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cmd_clean.add_argument("key", help="DHT key to delete")
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cmd_clean.set_defaults(func=clean)
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args = parser.parse_args(arglist)
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kwargs = args.__dict__
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func = kwargs.pop("func")
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asyncio.run(func(**kwargs))
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if __name__ == "__main__":
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handle_command_line(sys.argv[1:])
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@ -1,33 +0,0 @@
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"""Load and save configuration."""
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import json
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from pathlib import Path
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import veilid
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KEYFILE = Path(".demokeys")
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def read_keys() -> dict:
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"""Load the stored keys from disk."""
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try:
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raw = KEYFILE.read_text()
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except FileNotFoundError:
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return {
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"self": None,
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"peers": {},
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}
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keys = json.loads(raw)
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if keys["self"] is not None:
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keys["self"] = veilid.KeyPair(keys["self"])
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for name, pubkey in keys["peers"].items():
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keys["peers"][name] = veilid.PublicKey(pubkey)
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return keys
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def write_keys(keydata: dict):
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"""Save the keys to disk."""
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KEYFILE.write_text(json.dumps(keydata, indent=2))
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