CLN support, first draft

.env.mint.example

@@ -20,13 +20,17 @@ MINTING_MAX_AMOUNT=50000
 # max melt amount (in sats)
 MELTING_MAX_AMOUNT=50000
 
-# Lightning Backend - Lnd, FakeBackend (FOR TESTING ONLY)
+# Lightning Backend - Lnd, CLN, FakeBackend (FOR TESTING ONLY)
 LIGHTNING_BACKEND="Lnd"
 
 # LND
 LND_GRPC_HOST="127.0.0.1:10001"
 LND_CERT_PATH="/path/to/tls/cert"
 LND_MACAROON_PATH="/path/to/macaroon"
 
+# CLN
+CLN_REST_URL="http://127.0.0.1:3030"
+CLN_REST_RUNE="cln_rune_here" #change to path to rune later
+
 # enable MPP/NUT-15 (disabled by default)
 # ENABLE_MPP=TRUE

cmd/mint/mint.go

@@ -125,7 +125,7 @@ func configFromEnv() (*mint.Config, error) {
 	var lightningClient lightning.Client
 	switch os.Getenv("LIGHTNING_BACKEND") {
 	case "Lnd":
-		// read values for setting up LND
+		// Existing LND setup code remains unchanged
 		host := os.Getenv("LND_GRPC_HOST")
 		if host == "" {
 			return nil, errors.New("LND_GRPC_HOST cannot be empty")
@@ -167,8 +167,31 @@ func configFromEnv() (*mint.Config, error) {
 		if err != nil {
 			return nil, fmt.Errorf("error setting LND client: %v", err)
 		}
+
+	case "CLN":
+		// CLN setup
+		restURL := os.Getenv("CLN_REST_URL")
+		if restURL == "" {
+			return nil, errors.New("CLN_REST_URL cannot be empty")
+		}
+		runeToken := os.Getenv("CLN_REST_RUNE")
+		if runeToken == "" {
+			return nil, errors.New("CLN_REST_RUNE cannot be empty")
+		}
+
+		clnConfig := lightning.CLNConfig{
+			RestURL: restURL,
+			Rune:    runeToken,
+		}
+
+		lightningClient, err = lightning.SetupCLNClient(clnConfig)
+		if err != nil {
+			return nil, fmt.Errorf("error setting up CLN client: %v", err)
+		}
+
 	case "FakeBackend":
 		lightningClient = &lightning.FakeBackend{}
+
 	default:
 		return nil, errors.New("invalid lightning backend")
 	}