mirror of
https://github.com/Routstr/routstr-core.git
synced 2026-08-09 19:04:47 +00:00
609 lines
21 KiB
Python
609 lines
21 KiB
Python
import hashlib
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import math
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from typing import Optional
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from fastapi import HTTPException
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from sqlmodel import col, update
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from .core import get_logger
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from .core.db import ApiKey, AsyncSession
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from .payment.cost_caculation import (
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CostData,
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CostDataError,
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MaxCostData,
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calculate_cost,
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)
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from .wallet import (
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PRIMARY_MINT_URL,
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TRUSTED_MINTS,
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credit_balance,
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deserialize_token_from_string,
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)
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logger = get_logger(__name__)
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# TODO: implement prepaid api key (not like it was before)
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# PREPAID_API_KEY = os.environ.get("PREPAID_API_KEY", None)
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# PREPAID_BALANCE = int(os.environ.get("PREPAID_BALANCE", "0")) * 1000 # Convert to msats
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async def validate_bearer_key(
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bearer_key: str,
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session: AsyncSession,
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refund_address: Optional[str] = None,
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key_expiry_time: Optional[int] = None,
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) -> ApiKey:
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"""
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Validates the provided API key using SQLModel.
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If it's a cashu key, it redeems it and stores its hash and balance.
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Otherwise checks if the hash of the key exists.
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"""
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logger.debug(
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"Starting bearer key validation",
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extra={
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"key_preview": bearer_key[:20] + "..."
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if len(bearer_key) > 20
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else bearer_key,
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"has_refund_address": bool(refund_address),
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"has_expiry_time": bool(key_expiry_time),
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},
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)
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if not bearer_key:
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logger.error("Empty bearer key provided")
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raise HTTPException(
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status_code=401,
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detail={
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"error": {
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"message": "API key or Cashu token required",
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"type": "invalid_request_error",
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"code": "missing_api_key",
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}
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},
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)
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if bearer_key.startswith("sk-"):
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logger.debug(
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"Processing sk- prefixed API key",
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extra={"key_preview": bearer_key[:10] + "..."},
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)
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if existing_key := await session.get(ApiKey, bearer_key[3:]):
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logger.info(
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"Existing sk- API key found",
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extra={
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"key_hash": existing_key.hashed_key[:8] + "...",
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"balance": existing_key.balance,
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"total_requests": existing_key.total_requests,
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},
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)
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if key_expiry_time is not None:
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existing_key.key_expiry_time = key_expiry_time
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logger.debug(
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"Updated key expiry time",
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extra={
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"key_hash": existing_key.hashed_key[:8] + "...",
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"expiry_time": key_expiry_time,
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},
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)
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if refund_address is not None:
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existing_key.refund_address = refund_address
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logger.debug(
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"Updated refund address",
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extra={
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"key_hash": existing_key.hashed_key[:8] + "...",
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"refund_address_preview": refund_address[:20] + "..."
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if len(refund_address) > 20
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else refund_address,
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},
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)
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return existing_key
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else:
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logger.warning(
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"sk- API key not found in database",
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extra={"key_preview": bearer_key[:10] + "..."},
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)
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if bearer_key.startswith("cashu"):
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logger.debug(
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"Processing Cashu token",
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extra={
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"token_preview": bearer_key[:20] + "...",
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"token_type": bearer_key[:6] if len(bearer_key) >= 6 else bearer_key,
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},
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)
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try:
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hashed_key = hashlib.sha256(bearer_key.encode()).hexdigest()
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token_obj = deserialize_token_from_string(bearer_key)
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logger.debug(
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"Generated token hash", extra={"hash_preview": hashed_key[:16] + "..."}
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)
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if existing_key := await session.get(ApiKey, hashed_key):
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logger.info(
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"Existing Cashu token found",
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extra={
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"key_hash": existing_key.hashed_key[:8] + "...",
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"balance": existing_key.balance,
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"total_requests": existing_key.total_requests,
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},
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)
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if key_expiry_time is not None:
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existing_key.key_expiry_time = key_expiry_time
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logger.debug(
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"Updated key expiry time for existing Cashu key",
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extra={
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"key_hash": existing_key.hashed_key[:8] + "...",
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"expiry_time": key_expiry_time,
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},
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)
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if refund_address is not None:
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existing_key.refund_address = refund_address
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logger.debug(
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"Updated refund address for existing Cashu key",
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extra={
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"key_hash": existing_key.hashed_key[:8] + "...",
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"refund_address_preview": refund_address[:20] + "..."
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if len(refund_address) > 20
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else refund_address,
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},
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)
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return existing_key
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logger.info(
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"Creating new Cashu token entry",
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extra={
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"hash_preview": hashed_key[:16] + "...",
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"has_refund_address": bool(refund_address),
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"has_expiry_time": bool(key_expiry_time),
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},
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)
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if token_obj.mint in TRUSTED_MINTS:
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refund_currency = token_obj.unit
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refund_mint_url = token_obj.mint
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else:
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refund_currency = "sat"
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refund_mint_url = PRIMARY_MINT_URL
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new_key = ApiKey(
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hashed_key=hashed_key,
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balance=0,
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refund_address=refund_address,
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key_expiry_time=key_expiry_time,
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refund_currency=refund_currency,
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refund_mint_url=refund_mint_url,
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)
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session.add(new_key)
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await session.flush()
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logger.debug(
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"New key created, starting token redemption",
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extra={"key_hash": hashed_key[:8] + "..."},
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)
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logger.info(
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"AUTH: About to call credit_balance",
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extra={"token_preview": bearer_key[:50]},
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)
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try:
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msats = await credit_balance(bearer_key, new_key, session)
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logger.info(
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"AUTH: credit_balance returned successfully", extra={"msats": msats}
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)
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except Exception as credit_error:
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logger.error(
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"AUTH: credit_balance failed",
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extra={
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"error": str(credit_error),
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"error_type": type(credit_error).__name__,
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},
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)
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raise credit_error
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if msats <= 0:
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logger.error(
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"Token redemption returned zero or negative amount",
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extra={"msats": msats, "key_hash": hashed_key[:8] + "..."},
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)
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raise Exception("Token redemption failed")
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await session.refresh(new_key)
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await session.commit()
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logger.info(
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"New Cashu token successfully redeemed and stored",
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extra={
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"key_hash": hashed_key[:8] + "...",
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"redeemed_msats": msats,
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"final_balance": new_key.balance,
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},
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)
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return new_key
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except Exception as e:
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logger.error(
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"Cashu token redemption failed",
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extra={
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"error": str(e),
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"error_type": type(e).__name__,
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"token_preview": bearer_key[:20] + "..."
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if len(bearer_key) > 20
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else bearer_key,
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},
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)
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raise HTTPException(
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status_code=401,
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detail={
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"error": {
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"message": f"Invalid or expired Cashu key: {str(e)}",
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"type": "invalid_request_error",
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"code": "invalid_api_key",
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}
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},
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)
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logger.error(
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"Invalid API key format",
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extra={
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"key_preview": bearer_key[:10] + "..."
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if len(bearer_key) > 10
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else bearer_key,
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"key_length": len(bearer_key),
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},
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)
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raise HTTPException(
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status_code=401,
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detail={
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"error": {
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"message": "Invalid API key",
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"type": "invalid_request_error",
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"code": "invalid_api_key",
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}
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},
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)
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async def pay_for_request(
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key: ApiKey, cost_per_request: int, session: AsyncSession
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) -> int:
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"""Process payment for a request."""
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logger.info(
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"Processing payment for request",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"current_balance": key.balance,
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"required_cost": cost_per_request,
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"sufficient_balance": key.balance >= cost_per_request,
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},
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)
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if key.total_balance < cost_per_request:
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logger.warning(
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"Insufficient balance for request",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"balance": key.balance,
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"reserved_balance": key.reserved_balance,
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"required": cost_per_request,
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"shortfall": cost_per_request - key.total_balance,
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},
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)
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raise HTTPException(
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status_code=402,
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detail={
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"error": {
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"message": f"Insufficient balance: {cost_per_request} mSats required. {key.total_balance} available. (reserved: {key.reserved_balance})",
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"type": "insufficient_quota",
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"code": "insufficient_balance",
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}
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},
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)
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logger.debug(
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"Charging base cost for request",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"cost": cost_per_request,
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"balance_before": key.balance,
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},
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)
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# Charge the base cost for the request atomically to avoid race conditions
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stmt = (
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update(ApiKey)
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.where(col(ApiKey.hashed_key) == key.hashed_key)
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.where(col(ApiKey.balance) >= cost_per_request)
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.values(
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reserved_balance=col(ApiKey.reserved_balance) + cost_per_request,
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total_requests=col(ApiKey.total_requests) + 1,
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)
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)
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result = await session.exec(stmt) # type: ignore[call-overload]
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await session.commit()
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if result.rowcount == 0:
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logger.error(
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"Concurrent request depleted balance",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"required_cost": cost_per_request,
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"current_balance": key.balance,
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},
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)
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# Another concurrent request spent the balance first
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raise HTTPException(
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status_code=402,
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detail={
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"error": {
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"message": f"Insufficient balance: {cost_per_request} mSats required. {key.balance} available.",
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"type": "insufficient_quota",
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"code": "insufficient_balance",
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}
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},
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)
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await session.refresh(key)
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logger.info(
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"Payment processed successfully",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"charged_amount": cost_per_request,
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"new_balance": key.balance,
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"total_spent": key.total_spent,
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"total_requests": key.total_requests,
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},
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)
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return cost_per_request
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async def revert_pay_for_request(
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key: ApiKey, session: AsyncSession, cost_per_request: int
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) -> None:
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stmt = (
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update(ApiKey)
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.where(col(ApiKey.hashed_key) == key.hashed_key)
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.values(
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reserved_balance=col(ApiKey.reserved_balance) - cost_per_request,
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total_requests=col(ApiKey.total_requests) - 1,
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)
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)
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result = await session.exec(stmt) # type: ignore[call-overload]
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await session.commit()
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if result.rowcount == 0:
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logger.error(
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"Failed to revert payment - insufficient reserved balance",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"cost_to_revert": cost_per_request,
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"current_reserved_balance": key.reserved_balance,
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},
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)
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raise HTTPException(
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status_code=402,
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detail={
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"error": {
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"message": f"failed to revert request payment: {cost_per_request} mSats required. {key.balance} available.",
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"type": "payment_error",
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"code": "payment_error",
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}
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},
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)
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await session.refresh(key)
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async def adjust_payment_for_tokens(
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key: ApiKey, response_data: dict, session: AsyncSession, deducted_max_cost: int
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) -> dict:
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"""
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Adjusts the payment based on token usage in the response.
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This is called after the initial payment and the upstream request is complete.
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Returns cost data to be included in the response.
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"""
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model = response_data.get("model", "unknown")
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logger.debug(
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"Starting payment adjustment for tokens",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"model": model,
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"deducted_max_cost": deducted_max_cost,
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"current_balance": key.balance,
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"has_usage": "usage" in response_data,
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},
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)
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match calculate_cost(response_data, deducted_max_cost):
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case MaxCostData() as cost:
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logger.debug(
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"Using max cost data (no token adjustment)",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"model": model,
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"max_cost": cost.total_msats,
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},
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)
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return cost.dict()
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case CostData() as cost:
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# If token-based pricing is enabled and base cost is 0, use token-based cost
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# Otherwise, token cost is additional to the base cost
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cost_difference = cost.total_msats - deducted_max_cost
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total_cost_msats: int = math.ceil(cost.total_msats)
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logger.info(
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"Calculated token-based cost",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"model": model,
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"token_cost": cost.total_msats,
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"deducted_max_cost": deducted_max_cost,
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"cost_difference": cost_difference,
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"input_msats": cost.input_msats,
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"output_msats": cost.output_msats,
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},
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)
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if cost_difference == 0:
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logger.debug(
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"No cost adjustment needed",
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extra={"key_hash": key.hashed_key[:8] + "...", "model": model},
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)
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await session.commit()
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return cost.dict()
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# this should never happen why do we handle this???
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if cost_difference > 0:
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# Need to charge more
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logger.info(
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"Additional charge required for token usage",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"additional_charge": cost_difference,
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"current_balance": key.balance,
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"sufficient_balance": key.balance >= cost_difference,
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"model": model,
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},
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)
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# this should never happen why do we handle this???
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if key.balance < cost_difference:
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logger.warning(
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"Insufficient balance for token-based pricing adjustment",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"required": cost_difference,
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"available": key.balance,
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"shortfall": cost_difference - key.balance,
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"model": model,
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},
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)
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await session.commit()
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else:
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# this should never happen why do we handle this???
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charge_stmt = (
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update(ApiKey)
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.where(col(ApiKey.hashed_key) == key.hashed_key)
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.where(col(ApiKey.balance) >= cost_difference)
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.values(
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balance=col(ApiKey.balance) - cost_difference,
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total_spent=col(ApiKey.total_spent) + cost_difference,
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)
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)
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result = await session.exec(charge_stmt) # type: ignore[call-overload]
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await session.commit()
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if result.rowcount:
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cost.total_msats = deducted_max_cost + cost_difference
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await session.refresh(key)
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logger.info(
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"Additional charge applied successfully",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"charged_amount": cost_difference,
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"new_balance": key.balance,
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"total_cost": cost.total_msats,
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"model": model,
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},
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)
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else:
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logger.warning(
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"Failed to apply additional charge (concurrent operation)",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"attempted_charge": cost_difference,
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"model": model,
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},
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)
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else:
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# Refund some of the base cost
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refund = abs(cost_difference)
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logger.info(
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"Refunding excess payment",
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extra={
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"key_hash": key.hashed_key[:8] + "...",
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"refund_amount": refund,
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"current_balance": key.balance,
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"model": model,
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},
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)
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refund_stmt = (
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update(ApiKey)
|
|
.where(col(ApiKey.hashed_key) == key.hashed_key)
|
|
.values(
|
|
reserved_balance=col(ApiKey.reserved_balance)
|
|
- deducted_max_cost,
|
|
balance=col(ApiKey.balance) - total_cost_msats,
|
|
total_spent=col(ApiKey.total_spent) + total_cost_msats,
|
|
)
|
|
)
|
|
result = await session.exec(refund_stmt) # type: ignore[call-overload]
|
|
await session.commit()
|
|
|
|
if result.rowcount == 0:
|
|
logger.error(
|
|
"Failed to finalize payment - insufficient reserved balance",
|
|
extra={
|
|
"key_hash": key.hashed_key[:8] + "...",
|
|
"deducted_max_cost": deducted_max_cost,
|
|
"current_reserved_balance": key.reserved_balance,
|
|
"total_cost": total_cost_msats,
|
|
"model": model,
|
|
},
|
|
)
|
|
# Still return the cost data even if we couldn't properly finalize
|
|
# The reservation was already made, so the user has paid
|
|
|
|
cost.total_msats = total_cost_msats
|
|
await session.refresh(key)
|
|
|
|
logger.info(
|
|
"Refund processed successfully",
|
|
extra={
|
|
"key_hash": key.hashed_key[:8] + "...",
|
|
"refunded_amount": refund,
|
|
"new_balance": key.balance,
|
|
"final_cost": cost.total_msats,
|
|
"model": model,
|
|
},
|
|
)
|
|
|
|
return cost.dict()
|
|
|
|
case CostDataError() as error:
|
|
logger.error(
|
|
"Cost calculation error during payment adjustment",
|
|
extra={
|
|
"key_hash": key.hashed_key[:8] + "...",
|
|
"model": model,
|
|
"error_message": error.message,
|
|
"error_code": error.code,
|
|
},
|
|
)
|
|
|
|
raise HTTPException(
|
|
status_code=400,
|
|
detail={
|
|
"error": {
|
|
"message": error.message,
|
|
"type": "invalid_request_error",
|
|
"code": error.code,
|
|
}
|
|
},
|
|
)
|