bitcoin-cli

#!/usr/bin/env bash

set -euo pipefail

CLI_NAME="$(basename $0)"
CLI_DIR="$(dirname "$(readlink -f "$0")")"
CONTAINER="bitcoind"
RPC_USER=polaruser
RPC_PASS=polarpass
RPC_PORT=43782

BASE_COMMAND=(docker compose exec $CONTAINER bitcoin-cli -rpcport=$RPC_PORT -rpcuser=$RPC_USER -rpcpassword=$RPC_PASS)

DEFAULT_AMOUNT=0.001

show_help() {
  cat <<EOF
Shortcuts for bitcoin-cli.
Usage: ${CLI_NAME} <command> [options]
Flags:
    -h, --help                         Show this help message
Commands:
    fund <amount>                      Fund the wallet
    mine <amount> [--auto]             Generate a number of blocks
    send <address> <amount>            Send to address or BIP21 URI
    getInvoice <amount>                Get a new BIP21 URI with a bech32 address
EOF
}

if [ -z ${1+x} ]; then
  command=""
else
  command="$1"
fi

# Fund the wallet
if [[ "$command" = "fund" ]]; then
  "${BASE_COMMAND[@]}" -generate 101
  exit
fi

# Mine some blocks
if [[ "$command" = "mine" ]]; then
  shift

  if [ -z ${1+x} ]; then
    echo "Specify the number of blocks to generate."
    echo "Usage: \`$CLI_NAME $command <amount>\`"
    exit 1
  fi

  POSITIONAL_ARGS=()

  auto=false

  while [[ $# -gt 0 ]]; do
    case $1 in
    -l | --auto)
      auto=true
      shift
      ;;
    -* | --*)
      echo "Unknown option $1"
      exit 1
      ;;
    *)
      POSITIONAL_ARGS+=("$1")
      shift
      ;;
    esac
  done

  set -- "${POSITIONAL_ARGS[@]}"

  # default to 5 seconds
  interval=${2:-5}

  if $auto; then
    printf "Generating a block every $interval seconds. Press [CTRL+C] to stop...\n\n"

    while true; do
      "${BASE_COMMAND[@]}" -generate 1
      sleep $interval
    done
  else
    "${BASE_COMMAND[@]}" -generate "$@"
  fi

  exit
fi

# Send to a transaction
if [[ "$command" = "send" ]]; then
  shift

  if [ -z ${1+x} ]; then
    read -p "Enter a BIP21 URI or address: " uri
    echo
  else
    uri="$1"
  fi

  if [ -z ${2+x} ]; then
    amount=$DEFAULT_AMOUNT
  else
    amount="$2"
  fi

  protocol=$(echo "${uri%%:*}")

  if [[ "$protocol" == "bitcoin" ]]; then
    # BIP21 URI
    # Remove the protocol
    url_no_protocol=$(echo "${uri/$protocol/}" | cut -d":" -f2-)

    address=$(echo $url_no_protocol | grep "?" | cut -d"/" -f1 | rev | cut -d"?" -f2- | rev || echo $url_no_protocol)
    uri_amount=$(echo $url_no_protocol | cut -d'?' -f 2 | cut -d'=' -f 2 | cut -d'&' -f 1)

    if echo "$uri_amount" | grep -qE '^[0-9]*\.?[0-9]+$'; then
      amount=$uri_amount
    fi
  else
    address=$uri
  fi

  tx_id=$("${BASE_COMMAND[@]}" -named sendtoaddress address="$address" amount="$amount" fee_rate="25")

  echo "Sent $amount BTC to $address"
  echo "Transaction ID: $tx_id"

  exit
fi

# Get a new BIP21 URI
if [[ "$command" = "getInvoice" ]]; then
  shift

  if [ -z ${1+x} ]; then
    amount=$DEFAULT_AMOUNT
  else
    amount="$1"
  fi

  address=$("${BASE_COMMAND[@]}" getnewaddress -addresstype bech32 | tr -d '\r')
  uri="bitcoin:$address?amount=$amount"

  # print URI
  echo $uri

  # copy to clipboard (MacOS)
  echo $uri | pbcopy
  echo "Copied to clipboard."

  exit
fi

# Show usage information for this CLI
if [[ "$command" = "--help" ]] || [[ "$command" = "-h" ]]; then
  show_help
  exit
fi

# If no command specified pass all args straight to bitcoin-cli
"${BASE_COMMAND[@]}" "$@"
exit