pay lightning works

.env.example

@@ -13,5 +13,7 @@ MINT_SERVER_HOST=127.0.0.1
 MINT_SERVER_PORT=3338
 
 LIGHTNING=TRUE
+LIGHTNING_FEE=1.01
+
 LNBITS_ENDPOINT=https://legend.lnbits.com
 LNBITS_KEY=yourkeyasdasdasd

cashu.py

@@ -1 +0,0 @@
-# for mysterious reasons, this file needs to exist for `poetry run cashu` to work

core/settings.py

@@ -4,7 +4,9 @@ env = Env()
 env.read_env()
 
 DEBUG = env.bool("DEBUG", default=False)
-LIGHTNING = env.bool("LIGHTNING", default=False)
+LIGHTNING = env.bool("LIGHTNING", default=True)
+LIGHTNING_FEE = env.float("LIGHTNING_FEE", default=1.01)
+assert LIGHTNING_FEE >= 1.0, "LIGHTNING_FEE must be at least 1.0"
 
 MINT_PRIVATE_KEY = env.str("MINT_PRIVATE_KEY")
 
@@ -14,9 +16,6 @@ MINT_SERVER_PORT = env.int("MINT_SERVER_PORT", default=3338)
 MINT_HOST = env.str("MINT_HOST", default="127.0.0.1")
 MINT_PORT = env.int("MINT_PORT", default=3338)
 
-if MINT_HOST == "127.0.0.1":
-    MINT_URL = f"http://{MINT_HOST}:{MINT_PORT}"
-else:
 MINT_URL = f"http://{MINT_HOST}:{MINT_PORT}"
 
 LNBITS_ENDPOINT = env.str("LNBITS_ENDPOINT", default=None)

lightning/lnbits.py

@@ -8,8 +8,13 @@ import requests
 
 from core.settings import LNBITS_ENDPOINT, LNBITS_KEY
 
-from .base import (InvoiceResponse, PaymentResponse, PaymentStatus,
-                   StatusResponse, Wallet)
+from .base import (
+    InvoiceResponse,
+    PaymentResponse,
+    PaymentStatus,
+    StatusResponse,
+    Wallet,
+)
 
 
 class LNbitsWallet(Wallet):
@@ -82,6 +87,8 @@ class LNbitsWallet(Wallet):
         except:
             error_message = r.json()["detail"]
             return PaymentResponse(None, None, None, None, error_message)
+        if "detail" in r.json():
+            return PaymentResponse(None, None, None, None, r.json()["detail"])
         ok, checking_id, fee_msat, preimage, error_message = (
             True,
             None,

mint/app.py

@@ -142,6 +142,8 @@ async def melt(payload: MeltPayload):
     """
     Requests tokens to be destroyed and sent out via Lightning.
     """
+    ok, preimage = await ledger.melt(payload.proofs, payload.amount, payload.invoice)
+    return {"paid": ok, "preimage": preimage}
 
 
 @app.post("/check")

mint/ledger.py

@@ -3,7 +3,7 @@ Implementation of https://gist.github.com/phyro/935badc682057f418842c72961cf096c
 """
 
 import hashlib
-
+import math
 from ecc.curve import Point, secp256k1
 from ecc.key import gen_keypair
 
@@ -13,7 +13,7 @@ from core.base import Proof, BlindedMessage, BlindedSignature, BasePoint
 import core.b_dhke as b_dhke
 from core.base import Invoice
 from core.db import Database
-from core.settings import MAX_ORDER, LIGHTNING
+from core.settings import MAX_ORDER, LIGHTNING, LIGHTNING_FEE
 from core.split import amount_split
 from lightning import WALLET
 from mint.crud import (
@@ -155,6 +155,16 @@ class Ledger:
             await update_lightning_invoice(payment_hash, issued=True, db=self.db)
         return status.paid
 
+    async def _pay_lightning_invoice(self, invoice):
+        """Returns an invoice from the Lightning backend."""
+        error, balance = await WALLET.status()
+        if error:
+            raise Exception(f"Lightning wallet not responding: {error}")
+        ok, checking_id, fee_msat, preimage, error_message = await WALLET.pay_invoice(
+            invoice, fee_limit_msat=10
+        )
+        return ok, preimage
+
     async def _invalidate_proofs(self, proofs: List[Proof]):
         """Adds secrets of proofs to the list of knwon secrets and stores them in the db."""
         # Mark proofs as used and prepare new promises
@@ -200,9 +210,17 @@ class Ledger:
 
     async def melt(self, proofs: List[Proof], amount: int, invoice: str):
         """Invalidates proofs and pays a Lightning invoice."""
-        if not LIGHTNING:
-            raise Exception("Lightning is not active.")
-        return 0
+        # if not LIGHTNING:
+        total = sum([p["amount"] for p in proofs])
+        # check that lightning fees are included
+        assert math.ceil(total * LIGHTNING_FEE) >= amount, Exception(
+            "provided proofs not enough for Lightning payment."
+        )
+
+        status, preimage = await self._pay_lightning_invoice(invoice)
+        if status == True:
+            await self._invalidate_proofs(proofs)
+        return status, preimage
 
     async def check_spendable(self, proofs: List[Proof]):
         """Checks if all provided proofs are valid and still spendable (i.e. have not been spent)."""

poetry.lock

@@ -11,8 +11,8 @@ idna = ">=2.8"
 sniffio = ">=1.1"
 
 [package.extras]
-doc = ["packaging", "sphinx-rtd-theme", "sphinx-autodoc-typehints (>=1.2.0)"]
-test = ["coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "contextlib2", "uvloop (<0.15)", "mock (>=4)", "uvloop (>=0.15)"]
+doc = ["packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphinx-rtd-theme"]
+test = ["contextlib2", "coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "mock (>=4)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (<0.15)", "uvloop (>=0.15)"]
 trio = ["trio (>=0.16)"]
 
 [[package]]
@@ -24,7 +24,7 @@ optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-tests = ["pytest", "pytest-asyncio", "mypy (>=0.800)"]
+tests = ["mypy (>=0.800)", "pytest", "pytest-asyncio"]
 
 [[package]]
 name = "attrs"
@@ -35,10 +35,10 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
+dev = ["cloudpickle", "coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy (>=0.900,!=0.940)", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "sphinx", "sphinx-notfound-page", "zope.interface"]
+docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
+tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "zope.interface"]
+tests_no_zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
 
 [[package]]
 name = "bech32"
@@ -48,6 +48,14 @@ category = "main"
 optional = false
 python-versions = ">=3.5"
 
+[[package]]
+name = "bitstring"
+version = "3.1.9"
+description = "Simple construction, analysis and modification of binary data."
+category = "main"
+optional = false
+python-versions = "*"
+
 [[package]]
 name = "black"
 version = "22.8.0"
@@ -78,6 +86,17 @@ category = "main"
 optional = false
 python-versions = ">=3.6"
 
+[[package]]
+name = "cffi"
+version = "1.15.1"
+description = "Foreign Function Interface for Python calling C code."
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+pycparser = "*"
+
 [[package]]
 name = "charset-normalizer"
 version = "2.0.12"
@@ -142,6 +161,21 @@ url = "https://github.com/lc6chang/ecc-pycrypto.git"
 reference = "v1.0.1"
 resolved_reference = "eb8b8c19a81a52d9cf705d90a597a78cdaf2b6f6"
 
+[[package]]
+name = "ecdsa"
+version = "0.18.0"
+description = "ECDSA cryptographic signature library (pure python)"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[package.dependencies]
+six = ">=1.9.0"
+
+[package.extras]
+gmpy = ["gmpy"]
+gmpy2 = ["gmpy2"]
+
 [[package]]
 name = "environs"
 version = "9.5.0"
@@ -155,10 +189,10 @@ marshmallow = ">=3.0.0"
 python-dotenv = "*"
 
 [package.extras]
-dev = ["pytest", "dj-database-url", "dj-email-url", "django-cache-url", "flake8 (==4.0.1)", "flake8-bugbear (==21.9.2)", "mypy (==0.910)", "pre-commit (>=2.4,<3.0)", "tox"]
+dev = ["dj-database-url", "dj-email-url", "django-cache-url", "flake8 (==4.0.1)", "flake8-bugbear (==21.9.2)", "mypy (==0.910)", "pre-commit (>=2.4,<3.0)", "pytest", "tox"]
 django = ["dj-database-url", "dj-email-url", "django-cache-url"]
 lint = ["flake8 (==4.0.1)", "flake8-bugbear (==21.9.2)", "mypy (==0.910)", "pre-commit (>=2.4,<3.0)"]
-tests = ["pytest", "dj-database-url", "dj-email-url", "django-cache-url"]
+tests = ["dj-database-url", "dj-email-url", "django-cache-url", "pytest"]
 
 [[package]]
 name = "fastapi"
@@ -173,10 +207,10 @@ pydantic = ">=1.6.2,<1.7 || >1.7,<1.7.1 || >1.7.1,<1.7.2 || >1.7.2,<1.7.3 || >1.
 starlette = "0.19.1"
 
 [package.extras]
-all = ["requests (>=2.24.0,<3.0.0)", "jinja2 (>=2.11.2,<4.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "itsdangerous (>=1.1.0,<3.0.0)", "pyyaml (>=5.3.1,<7.0.0)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0)", "orjson (>=3.2.1,<4.0.0)", "email_validator (>=1.1.1,<2.0.0)", "uvicorn[standard] (>=0.12.0,<0.18.0)"]
-dev = ["python-jose[cryptography] (>=3.3.0,<4.0.0)", "passlib[bcrypt] (>=1.7.2,<2.0.0)", "autoflake (>=1.4.0,<2.0.0)", "flake8 (>=3.8.3,<6.0.0)", "uvicorn[standard] (>=0.12.0,<0.18.0)", "pre-commit (>=2.17.0,<3.0.0)"]
-doc = ["mkdocs (>=1.1.2,<2.0.0)", "mkdocs-material (>=8.1.4,<9.0.0)", "mdx-include (>=1.4.1,<2.0.0)", "mkdocs-markdownextradata-plugin (>=0.1.7,<0.3.0)", "typer (>=0.4.1,<0.5.0)", "pyyaml (>=5.3.1,<7.0.0)"]
-test = ["pytest (>=6.2.4,<7.0.0)", "pytest-cov (>=2.12.0,<4.0.0)", "mypy (==0.910)", "flake8 (>=3.8.3,<6.0.0)", "black (==22.3.0)", "isort (>=5.0.6,<6.0.0)", "requests (>=2.24.0,<3.0.0)", "httpx (>=0.14.0,<0.19.0)", "email_validator (>=1.1.1,<2.0.0)", "sqlalchemy (>=1.3.18,<1.5.0)", "peewee (>=3.13.3,<4.0.0)", "databases[sqlite] (>=0.3.2,<0.6.0)", "orjson (>=3.2.1,<4.0.0)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "flask (>=1.1.2,<3.0.0)", "anyio[trio] (>=3.2.1,<4.0.0)", "types-ujson (==4.2.1)", "types-orjson (==3.6.2)", "types-dataclasses (==0.6.5)"]
+all = ["email_validator (>=1.1.1,<2.0.0)", "itsdangerous (>=1.1.0,<3.0.0)", "jinja2 (>=2.11.2,<4.0.0)", "orjson (>=3.2.1,<4.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "pyyaml (>=5.3.1,<7.0.0)", "requests (>=2.24.0,<3.0.0)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0)", "uvicorn[standard] (>=0.12.0,<0.18.0)"]
+dev = ["autoflake (>=1.4.0,<2.0.0)", "flake8 (>=3.8.3,<6.0.0)", "passlib[bcrypt] (>=1.7.2,<2.0.0)", "pre-commit (>=2.17.0,<3.0.0)", "python-jose[cryptography] (>=3.3.0,<4.0.0)", "uvicorn[standard] (>=0.12.0,<0.18.0)"]
+doc = ["mdx-include (>=1.4.1,<2.0.0)", "mkdocs (>=1.1.2,<2.0.0)", "mkdocs-markdownextradata-plugin (>=0.1.7,<0.3.0)", "mkdocs-material (>=8.1.4,<9.0.0)", "pyyaml (>=5.3.1,<7.0.0)", "typer (>=0.4.1,<0.5.0)"]
+test = ["anyio[trio] (>=3.2.1,<4.0.0)", "black (==22.3.0)", "databases[sqlite] (>=0.3.2,<0.6.0)", "email_validator (>=1.1.1,<2.0.0)", "flake8 (>=3.8.3,<6.0.0)", "flask (>=1.1.2,<3.0.0)", "httpx (>=0.14.0,<0.19.0)", "isort (>=5.0.6,<6.0.0)", "mypy (==0.910)", "orjson (>=3.2.1,<4.0.0)", "peewee (>=3.13.3,<4.0.0)", "pytest (>=6.2.4,<7.0.0)", "pytest-cov (>=2.12.0,<4.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "requests (>=2.24.0,<3.0.0)", "sqlalchemy (>=1.3.18,<1.5.0)", "types-dataclasses (==0.6.5)", "types-orjson (==3.6.2)", "types-ujson (==4.2.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0)"]
 
 [[package]]
 name = "flask"
@@ -225,9 +259,9 @@ python-versions = ">=3.7"
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+docs = ["jaraco.packaging (>=9)", "rst.linker (>=1.9)", "sphinx"]
 perf = ["ipython"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.3)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "importlib-resources (>=1.3)"]
+testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
 
 [[package]]
 name = "iniconfig"
@@ -246,10 +280,10 @@ optional = false
 python-versions = ">=3.6.1,<4.0"
 
 [package.extras]
-pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
-requirements_deprecated_finder = ["pipreqs", "pip-api"]
 colors = ["colorama (>=0.4.3,<0.5.0)"]
+pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 plugins = ["setuptools"]
+requirements_deprecated_finder = ["pip-api", "pipreqs"]
 
 [[package]]
 name = "itsdangerous"
@@ -286,7 +320,7 @@ colorama = {version = ">=0.3.4", markers = "sys_platform == \"win32\""}
 win32-setctime = {version = ">=1.0.0", markers = "sys_platform == \"win32\""}
 
 [package.extras]
-dev = ["sphinx-rtd-theme (>=0.4.3)", "sphinx-autobuild (>=0.7.1)", "Sphinx (>=4.1.1)", "isort (>=5.1.1)", "black (>=19.10b0)", "pytest-cov (>=2.7.1)", "pytest (>=4.6.2)", "tox (>=3.9.0)", "flake8 (>=3.7.7)", "docutils (==0.16)", "colorama (>=0.3.4)"]
+dev = ["Sphinx (>=4.1.1)", "black (>=19.10b0)", "colorama (>=0.3.4)", "docutils (==0.16)", "flake8 (>=3.7.7)", "isort (>=5.1.1)", "pytest (>=4.6.2)", "pytest-cov (>=2.7.1)", "sphinx-autobuild (>=0.7.1)", "sphinx-rtd-theme (>=0.4.3)", "tox (>=3.9.0)"]
 
 [[package]]
 name = "markupsafe"
@@ -308,9 +342,9 @@ python-versions = ">=3.7"
 packaging = ">=17.0"
 
 [package.extras]
-dev = ["pytest", "pytz", "simplejson", "mypy (==0.971)", "flake8 (==5.0.4)", "flake8-bugbear (==22.8.22)", "pre-commit (>=2.4,<3.0)", "tox"]
-docs = ["sphinx (==5.1.1)", "sphinx-issues (==3.0.1)", "alabaster (==0.7.12)", "sphinx-version-warning (==1.1.2)", "autodocsumm (==0.2.9)"]
-lint = ["mypy (==0.971)", "flake8 (==5.0.4)", "flake8-bugbear (==22.8.22)", "pre-commit (>=2.4,<3.0)"]
+dev = ["flake8 (==5.0.4)", "flake8-bugbear (==22.8.22)", "mypy (==0.971)", "pre-commit (>=2.4,<3.0)", "pytest", "pytz", "simplejson", "tox"]
+docs = ["alabaster (==0.7.12)", "autodocsumm (==0.2.9)", "sphinx (==5.1.1)", "sphinx-issues (==3.0.1)", "sphinx-version-warning (==1.1.2)"]
+lint = ["flake8 (==5.0.4)", "flake8-bugbear (==22.8.22)", "mypy (==0.971)", "pre-commit (>=2.4,<3.0)"]
 tests = ["pytest", "pytz", "simplejson"]
 
 [[package]]
@@ -360,8 +394,8 @@ optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)", "sphinx (>=4)"]
-test = ["appdirs (==1.4.4)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)", "pytest (>=6)"]
+docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx (>=4)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
 
 [[package]]
 name = "pluggy"
@@ -372,8 +406,8 @@ optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-testing = ["pytest-benchmark", "pytest"]
-dev = ["tox", "pre-commit"]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "psycopg2-binary"
@@ -391,6 +425,14 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
+[[package]]
+name = "pycparser"
+version = "2.21"
+description = "C parser in Python"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
 [[package]]
 name = "pycrypto"
 version = "2.6.1"
@@ -423,7 +465,7 @@ optional = false
 python-versions = ">=3.6.8"
 
 [package.extras]
-diagrams = ["railroad-diagrams", "jinja2"]
+diagrams = ["jinja2", "railroad-diagrams"]
 
 [[package]]
 name = "pytest"
@@ -457,7 +499,7 @@ python-versions = ">=3.7"
 pytest = ">=6.1.0"
 
 [package.extras]
-testing = ["coverage (>=6.2)", "hypothesis (>=5.7.1)", "flaky (>=3.5.0)", "mypy (>=0.931)", "pytest-trio (>=0.7.0)"]
+testing = ["coverage (>=6.2)", "flaky (>=3.5.0)", "hypothesis (>=5.7.1)", "mypy (>=0.931)", "pytest-trio (>=0.7.0)"]
 
 [[package]]
 name = "python-dotenv"
@@ -482,7 +524,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 six = ">=1.8.0"
 
 [package.extras]
-test = ["ipython", "pytest (>=3.0.5)", "mock"]
+test = ["ipython", "mock", "pytest (>=3.0.5)"]
 
 [[package]]
 name = "requests"
@@ -502,6 +544,17 @@ urllib3 = ">=1.21.1,<1.27"
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
 
+[[package]]
+name = "secp256k1"
+version = "0.14.0"
+description = "FFI bindings to libsecp256k1"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+cffi = ">=1.3.0"
+
 [[package]]
 name = "six"
 version = "1.16.0"
@@ -531,12 +584,12 @@ mssql = ["pyodbc"]
 mssql_pymssql = ["pymssql"]
 mssql_pyodbc = ["pyodbc"]
 mysql = ["mysqlclient"]
-oracle = ["cx-oracle"]
+oracle = ["cx_oracle"]
 postgresql = ["psycopg2"]
 postgresql_pg8000 = ["pg8000 (<1.16.6)"]
 postgresql_psycopg2binary = ["psycopg2-binary"]
 postgresql_psycopg2cffi = ["psycopg2cffi"]
-pymysql = ["pymysql (<1)", "pymysql"]
+pymysql = ["pymysql", "pymysql (<1)"]
 
 [[package]]
 name = "sqlalchemy-aio"
@@ -596,7 +649,7 @@ optional = false
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-secure = ["pyOpenSSL (>=0.14,<18.0.0)", "pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
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 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
@@ -648,13 +701,13 @@ optional = false
 python-versions = ">=3.7"
 
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 python-versions = "^3.8"
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+secp256k1 = [
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+    {file = "secp256k1-0.14.0-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:fcabb3c3497a902fb61eec72d1b69bf72747d7bcc2a732d56d9319a1e8322262"},
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+    {file = "secp256k1-0.14.0-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:f4b9306bff6dde020444dfee9ca9b9f5b20ca53a2c0b04898361a3f43d5daf2e"},
+    {file = "secp256k1-0.14.0-cp36-cp36m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:72735da6cb28273e924431cd40aa607e7f80ef09608c8c9300be2e0e1d2417b4"},
+    {file = "secp256k1-0.14.0-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:87f4ad42a370f768910585989a301d1d65de17dcd86f6e8def9b021364b34d5c"},
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+    {file = "secp256k1-0.14.0-cp37-cp37m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:c91dd3154f6c46ac798d9a41166120e1751222587f54516cc3f378f56ce4ac82"},
+    {file = "secp256k1-0.14.0-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:fec790cb6d0d37129ca0ce5b3f8e85692d5fb618d1c440f189453d18694035df"},
+    {file = "secp256k1-0.14.0-cp37-cp37m-musllinux_1_1_i686.whl", hash = "sha256:63eb148196b8f646922d4be6739b17fbbf50ebb3a020078c823e2445d88b7a81"},
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+    {file = "secp256k1-0.14.0-cp38-cp38-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:ce0314788d3248b275426501228969fd32f6501c9d1837902ee0e7bd8264a36f"},
+    {file = "secp256k1-0.14.0-cp38-cp38-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:bc761894b3634021686714278fc62b73395fa3eded33453eadfd8a00a6c44ef3"},
+    {file = "secp256k1-0.14.0-cp38-cp38-musllinux_1_1_i686.whl", hash = "sha256:373dc8bca735f3c2d73259aa2711a9ecea2f3c7edbb663555fe3422e3dd76102"},
+    {file = "secp256k1-0.14.0-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:fe3f503c9dfdf663b500d3e0688ad842e116c2907ad3f1e1d685812df3f56290"},
+    {file = "secp256k1-0.14.0-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:4b1bf09953cde181132cf5e9033065615e5c2694e803165e2db763efa47695e5"},
+    {file = "secp256k1-0.14.0-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:6af07be5f8612628c3638dc7b208f6cc78d0abae3e25797eadb13890c7d5da81"},
+    {file = "secp256k1-0.14.0-cp39-cp39-musllinux_1_1_i686.whl", hash = "sha256:a8dbd75a9fb6f42de307f3c5e24573fe59c3374637cbf39136edc66c200a4029"},
+    {file = "secp256k1-0.14.0-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:97a30c8dae633cb18135c76b6517ae99dc59106818e8985be70dbc05dcc06c0d"},
+    {file = "secp256k1-0.14.0-pp37-pypy37_pp73-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:f4062d8c101aa63b9ecb3709f1f075ad9c01b6672869bbaa1bd77271816936a7"},
+    {file = "secp256k1-0.14.0-pp37-pypy37_pp73-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:c9e7c024ff17e9b9d7c392bb2a917da231d6cb40ab119389ff1f51dca10339a4"},
+    {file = "secp256k1-0.14.0.tar.gz", hash = "sha256:82c06712d69ef945220c8b53c1a0d424c2ff6a1f64aee609030df79ad8383397"},
+]
 six = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
     {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},

pyproject.toml

@@ -31,6 +31,9 @@ fastapi = "^0.83.0"
 environs = "^9.5.0"
 uvicorn = "^0.18.3"
 loguru = "^0.6.0"
+ecdsa = "^0.18.0"
+bitstring = "^3.1.9"
+secp256k1 = "^0.14.0"
 
 [tool.poetry.dev-dependencies]
 black = {version = "^22.8.0", allow-prereleases = true}

wallet/cashu.py

@@ -3,14 +3,17 @@
 import asyncio
 import base64
 import json
+import math
 from functools import wraps
 
 import click
 from bech32 import bech32_decode, bech32_encode, convertbits
 
-from core.settings import MINT_URL, LIGHTNING
+from core.settings import MINT_URL, LIGHTNING, LIGHTNING_FEE
 from core.migrations import migrate_databases
 from core.base import Proof
+import core.bolt11 as bolt11
+from core.bolt11 import Invoice
 from wallet.wallet import Wallet as Wallet
 from wallet import migrations
 
@@ -61,23 +64,18 @@ def coro(f):
 async def mint(ctx, amount: int, hash: str):
     wallet: Wallet = ctx.obj["WALLET"]
     await init_wallet(wallet)
-
+    wallet.status()
     if not LIGHTNING:
-        wallet.status()
         r = await wallet.mint(amount)
-        wallet.status()
-        return
-
-    if amount and not hash:
-        print(f"Balance: {wallet.balance}")
+    elif amount and not hash:
         r = await wallet.request_mint(amount)
-        print(r)
-        return
-
-    if amount and hash:
-        print(f"Balance: {wallet.balance}")
+        if "pr" in r:
+            print(f"Pay this invoice to mint {amount} sat:")
+            print(f"Invoice: {r['pr']}")
+            print(f"Hash: {r['hash']}")
+    elif amount and hash:
         await wallet.mint(amount, hash)
-        print(f"Balance: {wallet.balance}")
+    wallet.status()
     return
 
 
@@ -129,3 +127,28 @@ async def burn(ctx, token: str):
     proofs = [Proof.from_dict(p) for p in json.loads(base64.urlsafe_b64decode(token))]
     await wallet.invalidate(proofs)
     wallet.status()
+
+
+@cli.command("pay", help="Pay lightning invoice.")
+@click.argument("invoice", type=str)
+@click.pass_context
+@coro
+async def pay(ctx, invoice: str):
+    wallet: Wallet = ctx.obj["WALLET"]
+    await init_wallet(wallet)
+    wallet.status()
+    decoded_invoice: Invoice = bolt11.decode(invoice)
+    amount = math.ceil(
+        decoded_invoice.amount_msat / 1000 * LIGHTNING_FEE
+    )  # 1% fee for Lightning
+    print(
+        f"Paying Lightning invoice of {decoded_invoice.amount_msat // 1000} sat ({amount} sat with fees)"
+    )
+    assert amount > 0, "amount is not positive"
+    if wallet.available_balance < amount:
+        print("Error: Balance too low.")
+        return
+    _, send_proofs = await wallet.split_to_send(wallet.proofs, amount)
+    await wallet.pay_lightning(send_proofs, amount, invoice)
+    print("Invoice paid.")
+    wallet.status()

wallet/wallet.py

@@ -13,6 +13,7 @@ from core.base import (
     SplitPayload,
     BlindedSignature,
     CheckPayload,
+    MeltPayload,
 )
 from core.db import Database
 from core.split import amount_split
@@ -123,6 +124,14 @@ class LedgerAPI:
             return True
         return False
 
+    async def pay_lightning(self, proofs: List[Proof], amount: int, invoice: str):
+        payload = MeltPayload(proofs=proofs, amount=amount, invoice=invoice)
+        return_dict = requests.post(
+            self.url + "/melt",
+            json=payload.dict(),
+        ).json()
+        return return_dict
+
 
 class Wallet(LedgerAPI):
     """Minimal wallet wrapper."""
@@ -147,7 +156,7 @@ class Wallet(LedgerAPI):
         split = amount_split(amount)
         proofs = super().mint(split, payment_hash)
         if proofs == []:
-            raise Exception("received no proofs")
+            raise Exception("received no proofs.")
         await self._store_proofs(proofs)
         self.proofs += proofs
         return proofs
@@ -159,7 +168,7 @@ class Wallet(LedgerAPI):
         assert len(proofs) > 0, ValueError("no proofs provided.")
         fst_proofs, snd_proofs = super().split(proofs, amount)
         if len(fst_proofs) == 0 and len(snd_proofs) == 0:
-            raise Exception("received no splits")
+            raise Exception("received no splits.")
         used_secrets = [p["secret"] for p in proofs]
         self.proofs = list(
             filter(lambda p: p["secret"] not in used_secrets, self.proofs)
@@ -170,10 +179,19 @@ class Wallet(LedgerAPI):
             await invalidate_proof(proof, db=self.db)
         return fst_proofs, snd_proofs
 
+    async def pay_lightning(self, proofs: List[Proof], amount: int, invoice: str):
+        """Pays a lightning invoice"""
+        status = await super().pay_lightning(proofs, amount, invoice)
+        if status["paid"] == True:
+            await self.invalidate(proofs)
+        else:
+            raise Exception("could not pay invoice.")
+        return status["paid"]
+
     async def split_to_send(self, proofs: List[Proof], amount):
         """Like self.split but only considers non-reserved tokens."""
         if len([p for p in proofs if not p.reserved]) <= 0:
-            raise Exception("balance too low")
+            raise Exception("balance too low.")
         return await self.split([p for p in proofs if not p.reserved], amount)
 
     async def set_reserved(self, proofs: List[Proof], reserved: bool):