LNURL implementation for Python

A collection of helpers for building LNURL support into wallets and services.

Configuration

Developers can force strict RFC3986 validation for the URLs that the library encodes/decodes, using this env var:

LNURL_STRICT_RFC3986 = "0" by default (False)

Basic usage

>>> import lnurl
>>> lnurl.encode('https://service.io/?q=3fc3645b439ce8e7')
Lnurl('LNURL1DP68GURN8GHJ7UM9WFMXJCM99E5K7TELWY7NXENRXVMRGDTZXSENJCM98PJNWXQ96S9', bech32=Bech32('LNURL1DP68GURN8GHJ7UM9WFMXJCM99E5K7TELWY7NXENRXVMRGDTZXSENJCM98PJNWXQ96S9', hrp='lnurl', data=[13, 1, 26, 7, 8, 28, 3, 19, 7, 8, 23, 18, 30, 28, 27, 5, 14, 9, 27, 6, 18, 24, 27, 5, 5, 25, 20, 22, 30, 11, 25, 31, 14, 4, 30, 19, 6, 25, 19, 3, 6, 12, 27, 3, 8, 13, 11, 2, 6, 16, 25, 19, 18, 24, 27, 5, 7, 1, 18, 19, 14]), url=WebUrl('https://service.io/?q=3fc3645b439ce8e7', scheme='https', host='service.io', tld='io', host_type='domain', path='/', query='q=3fc3645b439ce8e7'))
>>> lnurl.decode('LNURL1DP68GURN8GHJ7UM9WFMXJCM99E5K7TELWY7NXENRXVMRGDTZXSENJCM98PJNWXQ96S9')
WebUrl('https://service.io/?q=3fc3645b439ce8e7', scheme='https', host='service.io', tld='io', host_type='domain', path='/', query='q=3fc3645b439ce8e7')

The Lnurl object wraps a bech32 LNURL to provide some extra utilities.

from lnurl import Lnurl

lnurl = Lnurl("LNURL1DP68GURN8GHJ7UM9WFMXJCM99E5K7TELWY7NXENRXVMRGDTZXSENJCM98PJNWXQ96S9")
lnurl.bech32  # "LNURL1DP68GURN8GHJ7UM9WFMXJCM99E5K7TELWY7NXENRXVMRGDTZXSENJCM98PJNWXQ96S9"
lnurl.bech32.hrp  # "lnurl"
lnurl.url  # "https://service.io/?q=3fc3645b439ce8e7"
lnurl.url.host  # "service.io"
lnurl.url.base  # "https://service.io/"
lnurl.url.query  # "q=3fc3645b439ce8e7"
lnurl.url.query_params  # {"q": "3fc3645b439ce8e7"}

Parsing LNURL responses

You can use a LnurlResponse to wrap responses you get from a LNURL. The different types of responses defined in the LNURL spec have a different model with different properties (see models.py):

import requests

from lnurl import Lnurl, LnurlResponse

lnurl = Lnurl('LNURL1DP68GURN8GHJ7MRWW4EXCTNZD9NHXATW9EU8J730D3H82UNV94MKJARGV3EXZAELWDJHXUMFDAHR6WFHXQERSVPCA649RV')
r = requests.get(lnurl.url)

res = LnurlResponse.from_dict(r.json())  # LnurlPayResponse
res.ok  # bool
res.max_sendable  # int
res.max_sats  # int
res.callback.base  # str
res.callback.query_params # dict
res.metadata  # str
res.metadata.list()  # list
res.metadata.text  # str
res.metadata.images  # list

If you have already requests installed, you can also use the .handle() function directly. It will return the appropriate response for a LNURL.

>>> import lnurl
>>> lnurl.handle('lightning:LNURL1DP68GURN8GHJ7MRWW4EXCTNZD9NHXATW9EU8J730D3H82UNV94CXZ7FLWDJHXUMFDAHR6V33XCUNSVE38QV6UF')
LnurlPayResponse(tag='payRequest', callback=WebUrl('https://lnurl.bigsun.xyz/lnurl-pay/callback/2169831', scheme='https', host='lnurl.bigsun.xyz', tld='xyz', host_type='domain', path='/lnurl-pay/callback/2169831'), min_sendable=10000, max_sendable=10000, metadata=LnurlPayMetadata('[["text/plain","NgHaEyaZNDnW iI DsFYdkI"],["image/png;base64","iVBOR...uQmCC"]]'))

Building your own LNURL responses

For LNURL services, the lnurl package can be used to build valid responses.

from lnurl import LnurlWithdrawResponse

res = LnurlWithdrawResponse(
    callback="https://lnurl.bigsun.xyz/lnurl-withdraw/callback/9702808",
    k1="38d304051c1b76dcd8c5ee17ee15ff0ebc02090c0afbc6c98100adfa3f920874",
    min_withdrawable=551000,
    max_withdrawable=551000,
    default_description="sample withdraw",
)
res.json()  # str
res.dict()  # dict

All responses are pydantic models, so the information you provide will be validated and you have access to .json() and .dict() methods to export the data.

Data is exported using 🐫 camelCase keys by default, as per spec. You can also use camelCases when you parse the data, and it will be converted to snake_case to make your Python code nicer.

If you want to export the data using 🐍 snake_case (in your Python code, for example), you can change the by_alias parameter: res.dict(by_alias=False) (it is True by default).

CLI

$ poetry run lnurl
Usage: lnurl [OPTIONS] COMMAND [ARGS]...

  Python CLI for LNURL decode and encode lnurls

Options:
  --help  Show this message and exit.

Commands:
  decode           decode a LNURL
  encode           encode a URL
  handle           handle a LNURL
  payment-request  make a payment_request