Update README.md

Add Lightning Address support

README.md

@@ -1,26 +1,31 @@
 # LnMe - your friendly ⚡ payment page
 
-LnMe is a personal Bitcoin Lightning payment website and payment widget.
+LnMe is a personal Bitcoin Lightning payment page/widget and self-hosted [Lightning Address](https://lightningaddress.com/) server.
+
 
 ![demo](./lnme-demo.gif)
 
-It is a small service written in Go that connects to a [lnd node](https://github.com/lightningnetwork/lnd/blob/master/docs/INSTALL.md) and exposes a simple HTTP JSON API to create and monitor invoices. 
-It comes with a configurable personal payment website and offers a JavaScript widget to integrate in existing websites.
+**See it in action: [ln.michaelbumann.com](https://ln.michaelbumann.com/) - my lightning address: bumi@ln.michaelbumann.com**
 
-If [webln](https://github.com/wbobeirne/webln) is available the widget automatically use webln to request the payment; 
-otherwise an overlay will be shown with the payment request and a QR code.
+LnMe focusses on simplicity and ease of deployment. It connects to an existing lightning node (currently LND is supported).
 
-## Motivation
+LnMe is one [simple executable](https://github.com/bumi/lnme/releases) file that can be deployed anywhere with no dependencies. (on your own node or for example with [one click on Heroku](#heroku))
 
-I wanted a simple way for people to send Lightning payments using my own lightning node.
-
-BTCPay Server is too big and hard to run for that and I do not need most of its features.
+## Features
 
+- [x] Embeded payment page - customizable (see demo)
+- [x] [Lightning Address](https://lightningaddress.com/) support
+- [x] WebLN integration - if [WebLN](https://webln.dev/) is not available a QRcode and the invoice will be shown
+- [x] [JavaScript widget](#javascript-widget-integration) for existing websites
+- [x] [Invoice API](https://github.com/bumi/lnme/wiki/API) - simple REST API to create LN invoices from existing JS code
+- [ ] [LNURL-pay](https://github.com/fiatjaf/lnurl-rfc/blob/luds/06.md) support
 
 ## Installation
 
-LnMe connects to your [LND node](https://github.com/lightningnetwork/lnd/blob/master/docs/INSTALL.md), so a running LND node is required. 
-LnMe can easily run next to LND on the same system.
+LnMe connects to your [LND node](https://github.com/lightningnetwork/lnd/blob/master/docs/INSTALL.md), so a running LND node is required.
+LnMe can easily run next to LND on the same system or any other hosting provider.
+
+There are no other dependencies. Simply download the binary and run it! 
 
 1. Download the latest [release](https://github.com/bumi/lnme/releases)
 2. Run `lnme`
@@ -55,6 +60,7 @@ Instead of the path to the macaroon and cert files you can also provide the hex
 * `static-path`: Path to a folder that you want to serve with LnMe (e.g. /home/bitcoin/lnme/website). Use this if you want to customize your ⚡website. default: disabled
 * `disable-website`: Disable the default LnMe website. Disable the website if you only want to embed the LnMe widget on your existing website.
 * `disable-cors`: Disable CORS headers. (default: false)
+* `disable-ln-address`: Disable [Lightning Address](https://lightningaddress.com/) handling.
 * `port`: Port to listen on. (default: 1323)
 * `request-limit`: Limit the allowed requests per second. (default: 5)
 
@@ -84,17 +90,31 @@ All environment variables must be prefixed by `LNME_` use `_` instead of `-`
 
     $ LNME_LND_ADDRESS=127.0.0.1:10005 lnme
 
+### LND Permissions
 
-### Deployment
+LnMe needs the following LND permissions:
 
-It is the easiest to run LnMe on the same node as LND. But you can run it anywhere as long as your LND node is accessible.
+* Read/Write permission for invoices
+* Write permission for onchain address (if you want to use the onchain option)
 
-#### Heroku 
+Use the LND [macaroon bakery](http://macaroon-bakery.freedomnode.com/) to create a new macaroon for LnMe.
+
+To get the HEX versions of the files use `xxd -plain` e.g. `xxd -plain invoice.macaroon | tr -d '\n'`
+
+## Deployment
+
+It is the easiest to run LnMe on the same node as LND. But you can run it anywhere as long as your LND node is accessible. Simply run the binary and make sure the PORT is accessible.
+
+### Heroku
 One click deployment with Heroku:
 
+You will need your LND address, the LND tls certificate (HEX) and the macaroon (HEX).
+
 [![Deploy on Heroku](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/bumi/lnme)
 
-#### Notes
+Here is a [Video Demo of the Heroku deployment](https://www.youtube.com/watch?v=hSFXhnLp_Rc)
+
+### Deployment Notes
 
 To run LnMe as systemd service have a look at the [systemd service example config](https://github.com/bumi/lnme/blob/master/examples/lnme.service)
 
@@ -109,6 +129,18 @@ lnme.michaelbumann.com {
 `$ caddy  --config /etc/caddy/Caddyfile`
 
 
+## Feature Usage
+
+### Lightning Address
+
+The Lightning Address is an Internet Identifier that allows anyone to send you Bitcoin over the Lightning Network.
+Lightning Address builds on [LNURL-pay](https://github.com/fiatjaf/lnurl-rfc/blob/luds/06.md) LnMe handles the necessary requests for you.
+
+For more information check out the website: [lightningaddress.com](https://lightningaddress.com/)
+
+Your Lightning Address: `{anything}@{your domain}`
+
+
 ### Customize your ⚡ website
 
 LnMe comes with a default website but you can easily configure and build your own using the the LnMe JavaScript widget or JSON API.
@@ -168,6 +200,11 @@ lnme.watchPayment().then(invoice => {
 
 ```
 
+## Motivation
+
+I wanted a simple way for people to send Lightning payments using my own lightning node.
+BTCPay Server is too big and hard to run for that and I do not need most of its features.
+
 ## Development
 
 Use `go run` to ron the service locally:

lnme.go

@@ -1,14 +1,19 @@
 package main
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"flag"
+	"fmt"
 	"log"
 	"net/http"
 	"os"
+	"strconv"
 	"strings"
 
 	rice "github.com/GeertJohan/go.rice"
 	"github.com/bumi/lnme/ln"
+	"github.com/bumi/lnme/lnurl"
 	"github.com/didip/tollbooth/v6"
 	"github.com/didip/tollbooth/v6/limiter"
 	"github.com/knadh/koanf"
@@ -137,6 +142,45 @@ func main() {
 		return c.JSON(http.StatusOK, invoice)
 	})
 
+	if !cfg.Bool("disable-ln-address") {
+		e.GET("/.well-known/lnurlp/:name", func(c echo.Context) error {
+			name := c.Param("name")
+			lightningAddress := name + "@" + c.Request().Host
+			lnurlMetadata := "[[\"text/identifier\", \"" + lightningAddress + "\"], [\"text/plain\", \"Sats for " + lightningAddress + "\"]]"
+
+			if amount := c.QueryParam("amount"); amount == "" {
+				lnurlPayResponse1 := lnurl.LNURLPayResponse1{
+					LNURLResponse:   lnurl.LNURLResponse{Status: "OK"},
+					Callback:        fmt.Sprintf("%s://%s%s", c.Scheme(), c.Request().Host, c.Request().URL.Path),
+					MinSendable:     1000,
+					MaxSendable:     100000000,
+					EncodedMetadata: lnurlMetadata,
+					CommentAllowed:  0,
+					Tag:             "payRequest",
+				}
+				return c.JSON(http.StatusOK, lnurlPayResponse1)
+			} else {
+				stdOutLogger.Printf("New LightningAddress request amount: %s", amount)
+				msats, err := strconv.ParseInt(amount, 10, 64)
+				if err != nil || msats < 1000 {
+					return c.JSON(http.StatusOK, lnurl.LNURLErrorResponse{Status: "ERROR", Reason: "Invalid Amount"})
+				}
+				sats := msats / 1000 // we need sats
+				metadataHash := sha256.Sum256([]byte(lnurlMetadata))
+				memo := hex.EncodeToString(metadataHash[:])
+				invoice, err := lnClient.AddInvoice(sats, memo)
+				lnurlPayResponse2 := lnurl.LNURLPayResponse2{
+					LNURLResponse: lnurl.LNURLResponse{Status: "OK"},
+					PR:            invoice.PaymentRequest,
+					Routes:        make([][]lnurl.RouteInfo, 0),
+					Disposable:    false,
+					SuccessAction: &lnurl.SuccessAction{Tag: "message", Message: "Thanks, payment received!"},
+				}
+				return c.JSON(http.StatusOK, lnurlPayResponse2)
+			}
+		})
+	}
+
 	// Debug test endpoint
 	e.GET("/ping", func(c echo.Context) error {
 		return c.JSON(http.StatusOK, "pong")
@@ -157,6 +201,7 @@ func LoadConfig() *koanf.Koanf {
 	f.String("lnd-macaroon-path", "~/.lnd/data/chain/bitcoin/mainnet/invoice.macaroon", "Path to the LND macaroon file.")
 	f.String("lnd-cert-path", "~/.lnd/tls.cert", "Path to the LND tls.cert file.")
 	f.Bool("disable-website", false, "Disable default embedded website.")
+	f.Bool("disable-ln-address", false, "Disable Lightning Address handling")
 	f.Bool("disable-cors", false, "Disable CORS headers.")
 	f.Float64("request-limit", 5, "Request limit per second.")
 	f.String("static-path", "", "Path to a static assets directory.")

lnurl/types.go

@@ -0,0 +1,52 @@
+// THANKS: https://github.com/fiatjaf/go-lnurl/blob/d50a8e916232580895822178fe36e0f5cf400554/base.go
+// only using the LNURL types here
+package lnurl
+
+import "net/url"
+
+type LNURLResponse struct {
+	Status string `json:"status,omitempty"`
+	Reason string `json:"reason,omitempty"`
+}
+
+type LNURLPayResponse1 struct {
+	LNURLResponse
+	Callback        string   `json:"callback"`
+	CallbackURL     *url.URL `json:"-"`
+	Tag             string   `json:"tag"`
+	MaxSendable     int64    `json:"maxSendable"`
+	MinSendable     int64    `json:"minSendable"`
+	EncodedMetadata string   `json:"metadata"`
+	Metadata        Metadata `json:"-"`
+	CommentAllowed  int64    `json:"commentAllowed"`
+}
+
+type LNURLPayResponse2 struct {
+	LNURLResponse
+	SuccessAction *SuccessAction `json:"successAction"`
+	Routes        [][]RouteInfo  `json:"routes"`
+	PR            string         `json:"pr"`
+	Disposable    bool           `json:"disposable,omitempty"`
+}
+
+type RouteInfo struct {
+	NodeId        string `json:"nodeId"`
+	ChannelUpdate string `json:"channelUpdate"`
+}
+
+type SuccessAction struct {
+	Tag         string `json:"tag"`
+	Description string `json:"description,omitempty"`
+	URL         string `json:"url,omitempty"`
+	Message     string `json:"message,omitempty"`
+	Ciphertext  string `json:"ciphertext,omitempty"`
+	IV          string `json:"iv,omitempty"`
+}
+
+type LNURLErrorResponse struct {
+	Status string   `json:"status,omitempty"`
+	Reason string   `json:"reason,omitempty"`
+	URL    *url.URL `json:"-"`
+}
+
+type Metadata [][]string