pay lightning script

Author: piotr-iohk

scripts/pay-lightning-address.sh

@@ -0,0 +1,130 @@
+#!/bin/bash
+#
+# Pay a Lightning invoice via Blocktank staging regtest API
+#
+# Accepts:
+#   BOLT11 invoice:     lnbcrt1p5m4tld...
+#   Lightning address:  satoshi@domain.com
+#   BIP21 URI:          bitcoin:bcrt1q...?lightning=lnbcrt1p5m4tld...
+#
+# Usage:
+#   ./scripts/pay-lightning-address.sh <target> [amount_sats]
+#
+# Examples:
+#   ./scripts/pay-lightning-address.sh lnbcrt1p5m4tld...
+#   ./scripts/pay-lightning-address.sh 'bitcoin:bcrt1q...?lightning=lnbcrt1p5m4tld...'
+#   ./scripts/pay-lightning-address.sh satoshi@localhost:3003 500
+#
+# Environment:
+#   BLOCKTANK_URL   → override API base (default: staging)
+#   LNURL_SCHEME    → http or https for LN address resolution (default: auto)
+
+set -e
+
+INPUT="$1"
+AMOUNT_SATS="${2:-100}"
+BLOCKTANK_URL="${BLOCKTANK_URL:-https://api.stag0.blocktank.to/blocktank/api/v2}"
+
+if [ -z "$INPUT" ]; then
+  echo "Usage: $0 <target> [amount_sats]"
+  echo ""
+  echo "  BOLT11:    $0 lnbcrt1p5m4tld..."
+  echo "  BIP21:     $0 'bitcoin:bcrt1q...?lightning=lnbcrt1p5m4tld...'"
+  echo "  LN addr:   $0 satoshi@localhost:3003 500"
+  exit 1
+fi
+
+INVOICE=""
+
+# --- Detect input type ---
+
+# BIP21 URI with lightning= parameter
+if echo "$INPUT" | grep -qi "^bitcoin:.*lightning="; then
+  INVOICE=$(echo "$INPUT" | sed -n 's/.*[?&]lightning=\([^&]*\).*/\1/p' | tr -d '[:space:]')
+  if [ -z "$INVOICE" ]; then
+    echo "✗ Could not extract lightning invoice from BIP21 URI"
+    exit 1
+  fi
+  echo "→ Extracted invoice from BIP21 URI (${#INVOICE} chars)"
+
+# Raw BOLT11 invoice
+elif echo "$INPUT" | grep -qiE "^ln(bc|tb|tbs|bcrt)"; then
+  INVOICE=$(echo "$INPUT" | tr -d '[:space:]')
+  echo "→ Using BOLT11 invoice (${#INVOICE} chars)"
+
+# Lightning address (user@domain)
+elif echo "$INPUT" | grep -q "@"; then
+  if ! command -v jq &> /dev/null; then
+    echo "✗ jq required for LN address. Install: brew install jq"
+    exit 1
+  fi
+
+  USERNAME="${INPUT%%@*}"
+  DOMAIN="${INPUT#*@}"
+
+  if [ -n "$LNURL_SCHEME" ]; then
+    SCHEME="$LNURL_SCHEME"
+  elif echo "$DOMAIN" | grep -qE "^(localhost|127\.0\.0\.1)"; then
+    SCHEME="http"
+  else
+    SCHEME="https"
+  fi
+
+  AMOUNT_MSATS=$((AMOUNT_SATS * 1000))
+  echo "→ Resolving ${USERNAME}@${DOMAIN}..."
+
+  LNURL_RESPONSE=$(curl -sf "${SCHEME}://${DOMAIN}/.well-known/lnurlp/${USERNAME}")
+  if [ $? -ne 0 ]; then
+    echo "✗ Failed to resolve lightning address"
+    exit 1
+  fi
+
+  CALLBACK=$(echo "$LNURL_RESPONSE" | jq -r '.callback')
+  MIN_SENDABLE=$(echo "$LNURL_RESPONSE" | jq -r '.minSendable')
+  MAX_SENDABLE=$(echo "$LNURL_RESPONSE" | jq -r '.maxSendable')
+
+  if [ "$AMOUNT_MSATS" -lt "$MIN_SENDABLE" ] || [ "$AMOUNT_MSATS" -gt "$MAX_SENDABLE" ]; then
+    echo "✗ ${AMOUNT_SATS} sats out of range [$((MIN_SENDABLE/1000))-$((MAX_SENDABLE/1000))] sats"
+    exit 1
+  fi
+
+  echo "→ Requesting invoice for ${AMOUNT_SATS} sats..."
+  SEP="?"; echo "$CALLBACK" | grep -q "?" && SEP="&"
+  INVOICE_RESPONSE=$(curl -sf "${CALLBACK}${SEP}amount=${AMOUNT_MSATS}")
+  INVOICE=$(echo "$INVOICE_RESPONSE" | jq -r '.pr' | tr -d '[:space:]')
+
+  if [ -z "$INVOICE" ] || [ "$INVOICE" = "null" ]; then
+    echo "✗ No invoice in callback response"
+    echo "$INVOICE_RESPONSE" | jq .
+    exit 1
+  fi
+  echo "→ Got invoice (${#INVOICE} chars)"
+else
+  echo "✗ Unrecognized format. Use: BOLT11, BIP21 URI, or lightning address"
+  exit 1
+fi
+
+# --- Pay via Blocktank ---
+
+BODY="{\"invoice\": \"${INVOICE}\""
+if [ -n "$AMOUNT_SATS" ] && [ "$AMOUNT_SATS" -gt 0 ] 2>/dev/null; then
+  BODY="${BODY}, \"amountSat\": ${AMOUNT_SATS}"
+fi
+BODY="${BODY}}"
+
+echo "→ Paying ${AMOUNT_SATS} sats via Blocktank..."
+PAY_RESPONSE=$(curl -s -w "\n%{http_code}" -X POST "${BLOCKTANK_URL}/regtest/channel/pay" \
+  -H "Content-Type: application/json" \
+  -d "$BODY")
+
+HTTP_CODE=$(echo "$PAY_RESPONSE" | tail -n1)
+BODY=$(echo "$PAY_RESPONSE" | sed '$d')
+
+if [ "$HTTP_CODE" -ge 200 ] && [ "$HTTP_CODE" -lt 300 ]; then
+  echo "✓ Payment sent"
+  [ -n "$BODY" ] && echo "  $BODY"
+else
+  echo "✗ Payment failed: HTTP $HTTP_CODE"
+  echo "  $BODY"
+  exit 1
+fi