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Removed demo code from this repo

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Teknique 2023-08-05 10:07:42 -07:00
parent 196bc38e81
commit 941d0a2d84
2 changed files with 0 additions and 258 deletions
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225
veilid-python/demo/chat.py
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#!/usr/bin/env python
"""A simple chat server using Veilid's DHT."""
import argparse
import asyncio
import sys
import config
import veilid
QUIT = "QUIT"
NONCE_LENGTH = 24
async def noop_callback(*args, **kwargs):
"""In the real world, we'd use this to process interesting incoming events."""
return
async def chatter(
router: veilid.api.RoutingContext,
crypto_system: veilid.CryptoSystem,
key: veilid.TypedKey,
secret: veilid.SharedSecret,
send_subkey: veilid.ValueSubkey,
recv_subkey: veilid.ValueSubkey,
):
"""Read input, write it to the DHT, and print the response from the DHT."""
last_seq = -1
async def encrypt(cleartext: str) -> bytes:
"""Encrypt the message with the shared secret and a random nonce."""
nonce = await crypto_system.random_nonce()
encrypted = await crypto_system.crypt_no_auth(cleartext.encode(), nonce, secret)
return nonce.to_bytes() + encrypted
async def decrypt(payload: bytes) -> str:
"""Decrypt the payload with the shared secret and the payload's nonce."""
nonce = veilid.Nonce.from_bytes(payload[:NONCE_LENGTH])
encrypted = payload[NONCE_LENGTH:]
cleartext = await crypto_system.crypt_no_auth(encrypted, nonce, secret)
return cleartext.decode()
# Prime the pumps. Especially when starting the conversation, this
# causes the DHT key to propagate to the network.
await router.set_dht_value(key, send_subkey, await encrypt("Hello from the world!"))
while True:
try:
msg = input("SEND> ")
except EOFError:
# Cat got your tongue? Hang up.
print("Closing the chat.")
await router.set_dht_value(key, send_subkey, await encrypt(QUIT))
return
# Write the input message to the DHT key.
await router.set_dht_value(key, send_subkey, await encrypt(msg))
# In the real world, don't do this. People may tease you for it.
# This is meant to be easy to understand for demonstration
# purposes, not a great pattern. Instead, you'd want to use the
# callback function to handle events asynchronously.
while True:
# Try to get an updated version of the receiving subkey.
resp = await router.get_dht_value(key, recv_subkey, True)
if resp is None:
continue
# If the other party hasn't sent a newer message, try again.
if resp.seq == last_seq:
continue
msg = await decrypt(resp.data)
if msg == QUIT:
print("Other end closed the chat.")
return
print(f"RECV< {msg}")
last_seq = resp.seq
break
async def start(host: str, port: int, name: str):
"""Begin a conversation with a friend."""
conn = await veilid.json_api_connect(host, port, noop_callback)
keys = config.read_keys()
my_keypair = keys["self"]
their_key = keys["peers"][name]
members = [
veilid.DHTSchemaSMPLMember(my_keypair.key(), 1),
veilid.DHTSchemaSMPLMember(their_key, 1),
]
router = await (await conn.new_routing_context()).with_privacy()
crypto_system = await conn.get_crypto_system(veilid.CryptoKind.CRYPTO_KIND_VLD0)
async with crypto_system, router:
secret = await crypto_system.cached_dh(their_key, my_keypair.secret())
record = await router.create_dht_record(veilid.DHTSchema.smpl(0, members))
print(f"New chat key: {record.key}")
print("Give that to your friend!")
# Close this key first. We'll reopen it for writing with our saved key.
await router.close_dht_record(record.key)
await router.open_dht_record(record.key, my_keypair)
try:
# Write to the 1st subkey and read from the 2nd.
await chatter(router, crypto_system, record.key, secret, 0, 1)
finally:
await router.close_dht_record(record.key)
await router.delete_dht_record(record.key)
async def respond(host: str, port: int, name: str, key: str):
"""Reply to a friend's chat."""
conn = await veilid.json_api_connect(host, port, noop_callback)
keys = config.read_keys()
my_keypair = keys["self"]
their_key = keys["peers"][name]
router = await (await conn.new_routing_context()).with_privacy()
crypto_system = await conn.get_crypto_system(veilid.CryptoKind.CRYPTO_KIND_VLD0)
async with crypto_system, router:
secret = await crypto_system.cached_dh(their_key, my_keypair.secret())
await router.open_dht_record(key, my_keypair)
# As the responder, we're writing to the 2nd subkey and reading from the 1st.
await chatter(router, crypto_system, key, secret, 1, 0)
async def keygen(host: str, port: int):
"""Generate a keypair."""
conn = await veilid.json_api_connect(host, port, noop_callback)
crypto_system = await conn.get_crypto_system(veilid.CryptoKind.CRYPTO_KIND_VLD0)
async with crypto_system:
my_keypair = await crypto_system.generate_key_pair()
keys = config.read_keys()
if keys["self"]:
print("You already have a keypair.")
sys.exit(1)
keys["self"] = my_keypair
config.write_keys(keys)
print(f"Your new public key is {my_keypair.key()}. Share it with your friends!")
async def add_friend(host: str, port: int, name: str, pubkey: str):
"""Add a friend's public key."""
keys = config.read_keys()
keys["peers"][name] = pubkey
config.write_keys(keys)
async def clean(host: str, port: int, key: str):
"""Delete a DHT key."""
conn = await veilid.json_api_connect(host, port, noop_callback)
router = await (await conn.new_routing_context()).with_privacy()
async with router:
await router.close_dht_record(key)
await router.delete_dht_record(key)
def handle_command_line(arglist: list[str]):
"""Process the command line.
This isn't the interesting part."""
parser = argparse.ArgumentParser(description="Veilid chat demonstration")
parser.add_argument("--host", default="localhost", help="Address of the Veilid server host.")
parser.add_argument("--port", type=int, default=5959, help="Port of the Veilid server.")
subparsers = parser.add_subparsers(required=True)
cmd_start = subparsers.add_parser("start", help=start.__doc__)
cmd_start.add_argument("name", help="Your friend's name")
cmd_start.set_defaults(func=start)
cmd_respond = subparsers.add_parser("respond", help=respond.__doc__)
cmd_respond.add_argument("name", help="Your friend's name")
cmd_respond.add_argument("key", help="The chat's DHT key")
cmd_respond.set_defaults(func=respond)
cmd_keygen = subparsers.add_parser("keygen", help=keygen.__doc__)
cmd_keygen.set_defaults(func=keygen)
cmd_add_friend = subparsers.add_parser("add-friend", help=add_friend.__doc__)
cmd_add_friend.add_argument("name", help="Your friend's name")
cmd_add_friend.add_argument("pubkey", help="Your friend's public key")
cmd_add_friend.set_defaults(func=add_friend)
cmd_clean = subparsers.add_parser("clean", help=clean.__doc__)
cmd_clean.add_argument("key", help="DHT key to delete")
cmd_clean.set_defaults(func=clean)
args = parser.parse_args(arglist)
kwargs = args.__dict__
func = kwargs.pop("func")
asyncio.run(func(**kwargs))
if __name__ == "__main__":
handle_command_line(sys.argv[1:])

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veilid-python/demo/config.py
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"""Load and save configuration."""
import json
from pathlib import Path
import veilid
KEYFILE = Path(".demokeys")
def read_keys() -> dict:
"""Load the stored keys from disk."""
try:
raw = KEYFILE.read_text()
except FileNotFoundError:
return {
"self": None,
"peers": {},
}
keys = json.loads(raw)
if keys["self"] is not None:
keys["self"] = veilid.KeyPair(keys["self"])
for name, pubkey in keys["peers"].items():
keys["peers"][name] = veilid.PublicKey(pubkey)
return keys
def write_keys(keydata: dict):
"""Save the keys to disk."""
KEYFILE.write_text(json.dumps(keydata, indent=2))