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from fastapi.responses import JSONResponse
from starlette.middleware.base import BaseHTTPMiddleware
from nacl.signing import VerifyKey
from nacl.exceptions import BadSignatureError
import hashlib
import secrets
import base58
import requests
import json
import httpx
import jwt
from jwt.exceptions import (
ExpiredSignatureError,
InvalidAudienceError,
InvalidSignatureError,
DecodeError
)
import datetime
import time
import base64
#from geopy.geocoders import Nominatim
#from geopy.exc import GeocoderServiceError
#geolocator = Nominatim(user_agent="velocity")
def SignatureVerification(mpc,X_401_Addr,X_401_Nonce,X_401_Sign,challange):
if X_401_Addr and X_401_Nonce and X_401_Sign:
try:
signature_bytes=None
if mpc=='true':
signature_bytes = base64.b64decode(X_401_Sign)
elif mpc=='false':
signature_bytes=base58.b58decode(X_401_Sign)
verify_key = VerifyKey(base58.b58decode(X_401_Addr))
payload_bytes = challange.encode("utf-8")
verify_key.verify(payload_bytes, signature_bytes)
return True
except BadSignatureError:
return False
def SecretNonceGenerator():
random_bytes = secrets.token_bytes(32)
return hashlib.sha256(random_bytes).hexdigest()
def verifyJWT(token_string,aud):
try:
payload = jwt.decode(
token_string,
"jwttoken",
algorithms=["HS256"],
audience=aud,
issuer="velocity401"
)
wallet_address = payload.get("sub")
print(f"✅ Token valid for wallet: {wallet_address}")
return wallet_address
except ExpiredSignatureError:
print("🚨 Token rejected: Signature has expired.")
return None
except InvalidAudienceError:
print(f"🚨 Token rejected: Invalid audience. Expected '{EXPECTED_AUDIENCE}'.")
return None
except InvalidSignatureError:
print("🚨 Token rejected: Invalid signature (key mismatch).")
return None
except DecodeError as e:
print(f"🚨 Token rejected: Malformed JWT structure. Error: {e}")
return None
except Exception as e:
print(f"⚠️ An unexpected error occurred during verification: {e}")
return None
def generateJWT(wallet,aud):
EXPIRY_DURATION = datetime.timedelta(days=3)
try:
payload = {
"sub": wallet,
"aud":aud,
"issuer":"velocity401",
"exp": datetime.datetime.utcnow() + EXPIRY_DURATION,
"iat": datetime.datetime.utcnow()
}
token = jwt.encode(payload, "jwttoken", algorithm="HS256")
return token
except Exception as e:
return None
def TokenCheck(walletPublicKey,required_mint,mint_amount):
url = f"https://mainnet.helius-rpc.com/?api-key=4e833ada-d32c-48c5-b020-c11b2253f25b"
payload = {
"jsonrpc": "2.0",
"id": "1",
"method": "getTokenAccountsByOwner",
"params": [
walletPublicKey,
{"mint":required_mint},
{"encoding": "jsonParsed"}
]
}
headers = {"Content-Type": "application/json"}
try:
response = requests.post(url, json=payload, headers=headers)
response.raise_for_status()
data = response.json()
except requests.exceptions.RequestException as e:
return {"status": False, "message": f"API Request Failed: {e}"}
token_accounts = data.get("result", {}).get("value")
if not token_accounts:
return False
try:
account_info = token_accounts[0]["account"]["data"]["parsed"]["info"]
token_amount = account_info["tokenAmount"]
ui_amount = float(token_amount.get("uiAmount"))
except (TypeError, KeyError, IndexError):
return {"status": False, "message": "Could not parse token account data"}
if float(ui_amount) >= float(mint_amount):
print(ui_amount)
print(True)
return True
else:
print(ui_amount)
return False
class x401Kit(BaseHTTPMiddleware):
def __init__(self, app,protected_paths:list):
super().__init__(app)
self.protected_paths = protected_paths
async def dispatch(self, request: Request, call_next):
if request.method == "OPTIONS":
return await call_next(request)
if not any(request.url.path.startswith(p) for p in self.protected_paths):
return await call_next(request)
NONCE=SecretNonceGenerator()
aud=request.headers.get("origin")
X_401_Nonce=request.headers.get("X-401-Nonce")
X_401_Sign=request.headers.get("X-401-Signature")
X_401_Addr=request.headers.get("X-401-Addr")
client_jwt=request.headers.get("x-jwt")
REQUIRED_SERVICE=None
if client_jwt:
decoded=verifyJWT(client_jwt,aud)
return JSONResponse(
content={"status":"identified","token":decoded,"message":"identified already"},
status_code=200,
headers={
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Credentials": "true"
})
if not X_401_Addr and not X_401_Nonce and not X_401_Sign :
payload401={
"X-401-Status":"Authrequired",
"x-401-Mechanism":"SOLANA",
"X-401-Nonce":NONCE,
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Credentials": "true",
"Access-Control-Expose-Headers": "x-401-Nonce, x-401-Mechanism, x-401-Status"
}
return JSONResponse(content={
"message":"401 Auth Required",
"information":"Non persistant stateless auth",
"issuer":"velocityinfra"
},headers=payload401,status_code=401)
required_mint = request.headers.get("required_mint")
mint_amount=float(request.headers.get("mint_amount"))
print(mint_amount)
helius_api_key = request.headers.get("helius_api_key")
mpc=request.headers.get("mpc")
challange=f"CHALLENGE::{X_401_Nonce}::{request.url.path}::VELOCITY401"
signverify=SignatureVerification(mpc,X_401_Addr,X_401_Nonce,X_401_Sign,challange)
tokenverify=None
if required_mint=="no":
tokenverify=True
else:
tokenverify=TokenCheck(X_401_Addr,required_mint,mint_amount)
print(tokenverify)
if signverify == True and tokenverify ==True:
response = await call_next(request)
if response.headers.get("content-type") == "application/json":
body_bytes = b""
async for chunk in response.body_iterator:
body_bytes += chunk
try:
data = json.loads(body_bytes.decode())
except json.JSONDecodeError:
return response
JWTTOKEN=generateJWT(X_401_Addr,aud)
data["token"] = JWTTOKEN
response_headers = dict(response.headers)
response_headers.pop("content-length", None)
print(data)
return JSONResponse(
content=data,
status_code=response.status_code,
headers=response_headers
)
return response
elif tokenverify==False:
return JSONResponse(
content={"status": "tokenerror", "message": "Missing required token"},
status_code=500,
headers={
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Credentials": "true"
})
elif signverify==False:
print("failed")
return JSONResponse(
content={"status": "signerror", "message": "bad signature"},
status_code=500,
headers={
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Credentials": "true"
})
else:
return JSONResponse(
content={"status": "autherror", "message": "Authentication failed"},
status_code=500,
headers={
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Credentials": "true"
}) |