mirror of
https://github.com/aljazceru/nutshell.git
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253 lines
9.4 KiB
Python
253 lines
9.4 KiB
Python
import base64
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import json
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import random
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import secrets as scrts
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import uuid
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from typing import List
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import requests
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import core.b_dhke as b_dhke
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from core.base import (
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BlindedMessage,
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BlindedSignature,
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CheckPayload,
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MeltPayload,
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MintPayloads,
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Proof,
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SplitPayload,
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)
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from core.db import Database
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from core.secp import PublicKey
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from core.settings import DEBUG
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from core.split import amount_split
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from wallet.crud import get_proofs, invalidate_proof, store_proof, update_proof_reserved
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class LedgerAPI:
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def __init__(self, url):
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self.url = url
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self.keys = self._get_keys(url)
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@staticmethod
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def _get_keys(url):
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resp = requests.get(url + "/keys").json()
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return {
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int(amt): PublicKey(bytes.fromhex(val), raw=True)
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for amt, val in resp.items()
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}
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@staticmethod
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def _get_output_split(amount):
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"""Given an amount returns a list of amounts returned e.g. 13 is [1, 4, 8]."""
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bits_amt = bin(amount)[::-1][:-2]
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rv = []
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for (pos, bit) in enumerate(bits_amt):
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if bit == "1":
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rv.append(2**pos)
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return rv
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def _construct_proofs(self, promises: List[BlindedSignature], secrets: List[str]):
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"""Returns proofs of promise from promises."""
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proofs = []
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for promise, (r, secret) in zip(promises, secrets):
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C_ = PublicKey(bytes.fromhex(promise.C_), raw=True)
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C = b_dhke.step3_alice(C_, r, self.keys[promise.amount])
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proof = Proof(amount=promise.amount, C=C.serialize().hex(), secret=secret)
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proofs.append(proof)
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return proofs
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def _generate_secret(self, randombits=128):
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"""Returns base64 encoded random string."""
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return scrts.token_urlsafe(randombits // 8)
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def request_mint(self, amount):
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"""Requests a mint from the server and returns Lightning invoice."""
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r = requests.get(self.url + "/mint", params={"amount": amount})
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return r.json()
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def mint(self, amounts, payment_hash=None):
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"""Mints new coins and returns a proof of promise."""
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payloads: MintPayloads = MintPayloads()
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secrets = []
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rs = []
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for amount in amounts:
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secret = self._generate_secret()
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secrets.append(secret)
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B_, r = b_dhke.step1_alice(secret)
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rs.append(r)
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payload: BlindedMessage = BlindedMessage(
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amount=amount, B_=B_.serialize().hex()
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)
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payloads.blinded_messages.append(payload)
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promises_list = requests.post(
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self.url + "/mint",
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json=payloads.dict(),
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params={"payment_hash": payment_hash},
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).json()
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if "error" in promises_list:
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raise Exception("Error: {}".format(promises_list["error"]))
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promises = [BlindedSignature.from_dict(p) for p in promises_list]
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return self._construct_proofs(promises, [(r, s) for r, s in zip(rs, secrets)])
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def split(self, proofs, amount):
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"""Consume proofs and create new promises based on amount split."""
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total = sum([p["amount"] for p in proofs])
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fst_amt, snd_amt = total - amount, amount
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fst_outputs = amount_split(fst_amt)
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snd_outputs = amount_split(snd_amt)
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# TODO: Refactor together with the same procedure in self.mint()
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secrets = []
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payloads: MintPayloads = MintPayloads()
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for output_amt in fst_outputs + snd_outputs:
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secret = self._generate_secret()
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B_, r = b_dhke.step1_alice(secret)
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secrets.append((r, secret))
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payload: BlindedMessage = BlindedMessage(
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amount=output_amt, B_=B_.serialize().hex()
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)
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payloads.blinded_messages.append(payload)
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split_payload = SplitPayload(proofs=proofs, amount=amount, output_data=payloads)
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promises_dict = requests.post(
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self.url + "/split",
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json=split_payload.dict(),
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).json()
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if "error" in promises_dict:
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raise Exception("Error: {}".format(promises_dict["error"]))
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promises_fst = [BlindedSignature.from_dict(p) for p in promises_dict["fst"]]
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promises_snd = [BlindedSignature.from_dict(p) for p in promises_dict["snd"]]
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# Obtain proofs from promises
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fst_proofs = self._construct_proofs(promises_fst, secrets[: len(promises_fst)])
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snd_proofs = self._construct_proofs(promises_snd, secrets[len(promises_fst) :])
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return fst_proofs, snd_proofs
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async def check_spendable(self, proofs: List[Proof]):
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payload = CheckPayload(proofs=proofs)
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return_dict = requests.post(
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self.url + "/check",
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json=payload.dict(),
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).json()
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return return_dict
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async def pay_lightning(self, proofs: List[Proof], amount: int, invoice: str):
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payload = MeltPayload(proofs=proofs, amount=amount, invoice=invoice)
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return_dict = requests.post(
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self.url + "/melt",
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json=payload.dict(),
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).json()
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return return_dict
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class Wallet(LedgerAPI):
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"""Minimal wallet wrapper."""
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def __init__(self, url: str, db: str, name: str = "no_name"):
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super().__init__(url)
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self.db = Database("wallet", db)
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self.proofs: List[Proof] = []
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self.name = name
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async def load_proofs(self):
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self.proofs = await get_proofs(db=self.db)
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async def _store_proofs(self, proofs):
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for proof in proofs:
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await store_proof(proof, db=self.db)
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async def request_mint(self, amount):
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return super().request_mint(amount)
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async def mint(self, amount: int, payment_hash: str = None):
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split = amount_split(amount)
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proofs = super().mint(split, payment_hash)
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if proofs == []:
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raise Exception("received no proofs.")
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await self._store_proofs(proofs)
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self.proofs += proofs
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return proofs
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async def redeem(self, proofs: List[Proof]):
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return await self.split(proofs, sum(p["amount"] for p in proofs))
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async def split(self, proofs: List[Proof], amount: int):
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assert len(proofs) > 0, ValueError("no proofs provided.")
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fst_proofs, snd_proofs = super().split(proofs, amount)
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if len(fst_proofs) == 0 and len(snd_proofs) == 0:
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raise Exception("received no splits.")
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used_secrets = [p["secret"] for p in proofs]
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self.proofs = list(
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filter(lambda p: p["secret"] not in used_secrets, self.proofs)
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)
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self.proofs += fst_proofs + snd_proofs
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await self._store_proofs(fst_proofs + snd_proofs)
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for proof in proofs:
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await invalidate_proof(proof, db=self.db)
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return fst_proofs, snd_proofs
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async def pay_lightning(self, proofs: List[Proof], amount: int, invoice: str):
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"""Pays a lightning invoice"""
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status = await super().pay_lightning(proofs, amount, invoice)
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if status["paid"] == True:
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await self.invalidate(proofs)
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else:
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raise Exception("could not pay invoice.")
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return status["paid"]
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@staticmethod
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async def serialize_proofs(proofs: List[Proof]):
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proofs_serialized = [p.to_dict() for p in proofs]
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token = base64.urlsafe_b64encode(
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json.dumps(proofs_serialized).encode()
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).decode()
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return token
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async def split_to_send(self, proofs: List[Proof], amount):
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"""Like self.split but only considers non-reserved tokens."""
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if len([p for p in proofs if not p.reserved]) <= 0:
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raise Exception("balance too low.")
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return await self.split([p for p in proofs if not p.reserved], amount)
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async def set_reserved(self, proofs: List[Proof], reserved: bool):
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"""Mark a proof as reserved to avoid reuse or delete marking."""
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uuid_str = str(uuid.uuid1())
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for proof in proofs:
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proof.reserved = True
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await update_proof_reserved(
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proof, reserved=reserved, send_id=uuid_str, db=self.db
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)
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async def check_spendable(self, proofs):
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return await super().check_spendable(proofs)
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async def invalidate(self, proofs):
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"""Invalidates all spendable tokens supplied in proofs."""
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spendables = await self.check_spendable(proofs)
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invalidated_proofs = []
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for idx, spendable in spendables.items():
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if not spendable:
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invalidated_proofs.append(proofs[int(idx)])
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await invalidate_proof(proofs[int(idx)], db=self.db)
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invalidate_secrets = [p["secret"] for p in invalidated_proofs]
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self.proofs = list(
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filter(lambda p: p["secret"] not in invalidate_secrets, self.proofs)
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)
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@property
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def balance(self):
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return sum(p["amount"] for p in self.proofs)
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@property
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def available_balance(self):
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return sum(p["amount"] for p in self.proofs if not p.reserved)
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def status(self):
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print(
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f"Balance: {self.balance} sat (Available: {self.available_balance} sat in {len([p for p in self.proofs if not p.reserved])} tokens)"
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)
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def proof_amounts(self):
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return [p["amount"] for p in sorted(self.proofs, key=lambda p: p["amount"])]
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