#!/bin/sh

###############################################################################
#
#                             install-full-node.sh
#
# This is the install script for Bitcoin full node based on Bitcoin Core.
#
# *** SCRIPT AVAILABILITY *****************************************************
#
# This script is available from:
# https://bitnodes.io/install-full-node.sh
#
# Checksum file:
# https://bitnodes.io/install-full-node.sh.sha256sum
#
# Signed checksum file:
# https://bitnodes.io/install-full-node.sh.sha256sum.asc
#
# *** SCRIPT VERIFICATION *****************************************************
#
# To verify the integrity of install-full-node.sh:
#
#   Skip step 1 to 3 if you have already imported Bitnodes GPG public key.
#
#   1) Download Bitnodes GPG public key from https://bitnodes.io/bitnodes.gpg
#
#      $ wget https://bitnodes.io/bitnodes.gpg
#
#   2) Check that the key ID matches E6F70B39916272508FBDEAB7A92FB2B8A33B9C42
#
#      $ gpg --show-keys bitnodes.gpg
#
#      pub   rsa4096 2023-05-21 [SC]
#            E6F70B39916272508FBDEAB7A92FB2B8A33B9C42
#      uid                      Bitnodes <info@bitnodes.io>
#      sub   rsa4096 2023-05-21 [E]
#
#   3) If the key ID matches, continue to import the key. If it doesn't match,
#      please contact info@bitnodes.io.
#
#      $ gpg --import bitnodes.gpg
#
#      gpg: key A92FB2B8A33B9C42: public key "Bitnodes <info@bitnodes.io>" imported
#      gpg: Total number processed: 1
#      gpg:               imported: 1
#
#   4) Download the checksum files for install-full-node.sh
#
#      $ wget https://bitnodes.io/install-full-node.sh.sha256sum.asc https://bitnodes.io/install-full-node.sh.sha256sum
#
#   5) Verify the checksum of install-full-node.sh
#
#      $ gpg --verify install-full-node.sh.sha256sum.asc && sha256sum -c install-full-node.sh.sha256sum
#
#      gpg: assuming signed data in 'install-full-node.sh.sha256sum'
#      gpg: Signature made Sun 21 May 2023 03:44:13 AM UTC
#      gpg:                using RSA key E6F70B39916272508FBDEAB7A92FB2B8A33B9C42
#      gpg:                issuer "info@bitnodes.io"
#      gpg: Good signature from "Bitnodes <info@bitnodes.io>" [unknown]
#      gpg: WARNING: This key is not certified with a trusted signature!
#      gpg:          There is no indication that the signature belongs to the owner.
#      Primary key fingerprint: E6F7 0B39 9162 7250 8FBD  EAB7 A92F B2B8 A33B 9C42
#      install-full-node.sh: OK
#
# *** SCRIPT USAGE ************************************************************
#
# This script attempts to make your node automatically reachable by other nodes
# in the network. This is done by using uPnP to open port 8333 on your router
# to accept incoming connections to port 8333 and route the connections to your
# node running inside your local network.
#
# For security reason, wallet functionality is not enabled by default.
#
# Supported OS: Linux, Mac OS X, BSD, Windows (Windows Subsystem for Linux)
# Supported platforms: x86, x86_64, ARM
#
# Usage:
#
#   Open your terminal and type:
#   $ curl https://bitnodes.io/install-full-node.sh | sh
#
# Bitcoin Core will be installed using binaries provided by bitcoincore.org.
#
# If the binaries for your system are not available, the installer will attempt
# to build and install Bitcoin Core from source.
#
# All files will be installed into $HOME/bitcoin-core directory. Layout of this
# directory after the installation is shown below:
#
# Source files:
#   $HOME/bitcoin-core/bitcoin/
#
# Binaries:
#   $HOME/bitcoin-core/bin/
#
# Configuration file:
#   $HOME/bitcoin-core/.bitcoin/bitcoin.conf
#
# Blockchain data files:
#   $HOME/bitcoin-core/.bitcoin/blocks
#   $HOME/bitcoin-core/.bitcoin/chainstate
#
# Need help? Contact info@bitnodes.io
#
###############################################################################

REPO_URL="https://github.com/bitcoin/bitcoin.git"

# See https://github.com/bitcoin/bitcoin/tags for latest version.
VERSION=26.0

TARGET_DIR=$HOME/bitcoin-core
PORT=8333

BUILD=0
UNINSTALL=0

BLUE='\033[94m'
GREEN='\033[32;1m'
YELLOW='\033[33;1m'
RED='\033[91;1m'
RESET='\033[0m'

ARCH=$(uname -m)
SYSTEM=$(uname -s)
MAKE="make"
if [ "$SYSTEM" = "FreeBSD" ]; then
    MAKE="gmake"
fi
SUDO=""

usage() {
    cat <<EOF

This is the install script for Bitcoin full node based on Bitcoin Core.

Usage: $0 [-h] [-v <version>] [-t <target_directory>] [-p <port>] [-b] [-u]

-h
    Print usage.

-v <version>
    Version of Bitcoin Core to install.
    Default: $VERSION

-t <target_directory>
    Target directory for source files and binaries.
    Default: $HOME/bitcoin-core

-p <port>
    Bitcoin Core listening port.
    Default: $PORT

-b
    Build and install Bitcoin Core from source.
    Default: $BUILD

-u
    Uninstall Bitcoin Core.

EOF
}

print_info() {
    printf "$BLUE$1$RESET\n"
}

print_success() {
    printf "$GREEN$1$RESET\n"
    sleep 1
}

print_warning() {
    printf "$YELLOW$1$RESET\n"
}

print_error() {
    printf "$RED$1$RESET\n"
    sleep 1
}

print_start() {
    print_info "Start date: $(date)"
}

print_end() {
    print_info "\nEnd date: $(date)"
}

print_readme() {
    cat <<EOF

# README

To stop Bitcoin Core:

    cd $TARGET_DIR/bin && ./stop.sh

To start Bitcoin Core again:

    cd $TARGET_DIR/bin && ./start.sh

To use bitcoin-cli program:

    cd $TARGET_DIR/bin && ./bitcoin-cli -conf=$TARGET_DIR/.bitcoin/bitcoin.conf getnetworkinfo

To view Bitcoin Core log file:

    tail -f $TARGET_DIR/.bitcoin/debug.log

To uninstall Bitcoin Core:

    ./install-full-node.sh -u

To uninstall Bitcoin Core without a local copy of the install script:

    sh <( curl -Ls https://bitnodes.io/install-full-node.sh ) -u

EOF
}

program_exists() {
    type "$1" > /dev/null 2>&1
    return $?
}

create_target_dir() {
    if [ ! -d "$TARGET_DIR" ]; then
        print_info "\nCreating target directory: $TARGET_DIR"
        mkdir -p $TARGET_DIR
    fi
}

init_system_install() {
    if [ $(id -u) -ne 0 ]; then
        if program_exists "sudo"; then
            SUDO="sudo"
            print_info "\nInstalling required system packages.."
        else
            print_error "\nsudo program is required to install system packages. Please install sudo as root and rerun this script as normal user."
            exit 1
        fi
    fi
}

install_miniupnpc() {
    print_info "Installing miniupnpc from source.."
    $SUDO rm -rf miniupnpc-2.2.4 miniupnpc-2.2.4.tar.gz &&
        wget -q http://miniupnp.free.fr/files/miniupnpc-2.2.4.tar.gz -O miniupnpc-2.2.4.tar.gz && \
        tar xzf miniupnpc-2.2.4.tar.gz && \
        cd miniupnpc-2.2.4 && \
        $SUDO $MAKE install > build.out 2>&1 && \
        cd .. && \
        $SUDO rm -rf miniupnpc-2.2.4 miniupnpc-2.2.4.tar.gz
}

install_debian_build_dependencies() {
    $SUDO apt-get update
    $SUDO apt-get install -y \
        automake \
        autotools-dev \
        build-essential \
        curl \
        git \
        libboost-all-dev \
        libevent-dev \
        libminiupnpc-dev \
        libssl-dev \
        libtool \
        pkg-config
}

# This applies also for Fedora distribution.
install_centos_build_dependencies() {
    $SUDO yum install -y \
        automake \
        boost-devel \
        curl \
        gcc-c++ \
        git \
        libevent-devel \
        libtool \
        make \
        openssl-devel \
        wget
    install_miniupnpc
    echo '/usr/lib' | $SUDO tee /etc/ld.so.conf.d/miniupnpc-x86.conf > /dev/null && $SUDO ldconfig
}

install_archlinux_build_dependencies() {
    $SUDO pacman -S --noconfirm \
        automake \
        boost \
        curl \
        git \
        libevent \
        libtool \
        miniupnpc \
        openssl
}

install_alpine_build_dependencies() {
    $SUDO apk update
    $SUDO apk add \
        autoconf \
        automake \
        boost-dev \
        build-base \
        curl \
        git \
        libevent-dev \
        libtool \
        openssl-dev
    install_miniupnpc
}

install_mac_build_dependencies() {
    if ! program_exists "gcc"; then
        print_info "When the popup appears, click 'Install' to install the XCode Command Line Tools."
        xcode-select --install
    fi

    if ! program_exists "brew"; then
        /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
    fi

    brew install \
        --c++11 \
        automake \
        boost \
        libevent \
        libtool \
        miniupnpc \
        openssl \
        pkg-config
}

install_freebsd_build_dependencies() {
    $SUDO pkg install -y \
        autoconf \
        automake \
        boost-libs \
        curl \
        git \
        gmake \
        libevent \
        libtool \
        miniupnpc \
        openssl \
        pkgconf \
        wget
}

install_build_dependencies() {
    init_system_install
    case "$SYSTEM" in
        Linux)
            if program_exists "apt-get"; then
                install_debian_build_dependencies
            elif program_exists "yum"; then
                install_centos_build_dependencies
            elif program_exists "pacman"; then
                install_archlinux_build_dependencies
            elif program_exists "apk"; then
                install_alpine_build_dependencies
            else
                print_error "\nSorry, your system is not supported by this installer."
                exit 1
            fi
            ;;
        Darwin)
            install_mac_build_dependencies
            ;;
        FreeBSD)
            install_freebsd_build_dependencies
            ;;
        *)
            print_error "\nSorry, your system is not supported by this installer."
            exit 1
            ;;
    esac
}

build_bitcoin_core() {
    cd $TARGET_DIR

    if [ ! -d "$TARGET_DIR/bitcoin" ]; then
        print_info "\nDownloading Bitcoin Core source files.."
        git clone --quiet $REPO_URL
    fi

    cxxflags=""
    ldflags=""
    if [ "$SYSTEM" = "Linux" ]; then
        ram_kb=$(grep MemTotal /proc/meminfo | awk '{print $2}')
        if [ $ram_kb -lt 1500000 ]; then
            # Tune gcc to use less memory on single board computers.
            cxxflags="--param ggc-min-expand=1 --param ggc-min-heapsize=32768"
        fi
    fi
    if [ "$SYSTEM" = "FreeBSD" ]; then
        cxxflags="-I/usr/local/include"
        ldflags="-L/usr/local/lib"
    fi

    print_info "\nBuilding Bitcoin Core v$VERSION"
    print_info "Build output: $TARGET_DIR/bitcoin/build.out"
    print_info "This can take up to an hour or more.."
    rm -f build.out
    cd bitcoin &&
        git fetch > build.out 2>&1 &&
        git checkout "v$VERSION" 1>> build.out 2>&1 &&
        git clean -f -d -x 1>> build.out 2>&1 &&
        ./autogen.sh 1>> build.out 2>&1 &&
        ./configure \
            CXXFLAGS="$cxxflags" \
            LDFLAGS="$ldflags" \
            --disable-maintainer-mode \
            --without-gui \
            --with-miniupnpc \
            --disable-wallet \
            --disable-tests \
            --enable-upnp-default \
            1>> build.out 2>&1 &&
        $MAKE 1>> build.out 2>&1

    if [ ! -f "$TARGET_DIR/bitcoin/src/bitcoind" ]; then
        print_error "Build failed. See $TARGET_DIR/bitcoin/build.out"
        exit 1
    fi
}

get_bin_url() {
    url="https://bitcoincore.org/bin/bitcoin-core-$VERSION"
    case "$SYSTEM" in
        Linux)
            if program_exists "apk"; then
                echo ""
            elif [ "$ARCH" = "armv7l" ]; then
                url="$url/bitcoin-$VERSION-arm-linux-gnueabihf.tar.gz"
                echo "$url"
            else
                url="$url/bitcoin-$VERSION-$ARCH-linux-gnu.tar.gz"
                echo "$url"
            fi
            ;;
        Darwin)
            url="$url/bitcoin-$VERSION-$ARCH-apple-darwin.tar.gz"
            echo "$url"
            ;;
        FreeBSD)
            echo ""
            ;;
        *)
            echo ""
            ;;
    esac
}

download_bin() {
    checksum_url="https://bitcoincore.org/bin/bitcoin-core-$VERSION/SHA256SUMS"

    cd $TARGET_DIR

    rm -f bitcoin-$VERSION.tar.gz checksum.asc

    print_info "\nDownloading Bitcoin Core binaries.."
    if program_exists "wget"; then
        wget -q "$1" -O bitcoin-$VERSION.tar.gz &&
            wget -q "$checksum_url" -O checksum.asc &&
            mkdir -p bitcoin-$VERSION &&
            tar xzf bitcoin-$VERSION.tar.gz -C bitcoin-$VERSION --strip-components=1
    elif program_exists "curl"; then
        curl -s "$1" -o bitcoin-$VERSION.tar.gz &&
            curl -s "$checksum_url" -o checksum.asc &&
            mkdir -p bitcoin-$VERSION &&
            tar xzf bitcoin-$VERSION.tar.gz -C bitcoin-$VERSION --strip-components=1
    else
        print_error "\nwget or curl program is required to continue. Please install wget or curl as root and rerun this script as normal user."
        exit 1
    fi

    if program_exists "shasum"; then
        checksum=$(shasum -a 256 bitcoin-$VERSION.tar.gz | awk '{ print $1 }')
        if grep -q "$checksum" checksum.asc; then
            print_success "Checksum passed: bitcoin-$VERSION.tar.gz ($checksum)"
        else
            print_error "Checksum failed: bitcoin-$VERSION.tar.gz ($checksum). Please rerun this script to download and validate the binaries again."
            exit 1
        fi
    fi

    rm -f bitcoin-$VERSION.tar.gz checksum.asc
}

install_bitcoin_core() {
    cd $TARGET_DIR

    print_info "\nInstalling Bitcoin Core v$VERSION"

    if [ ! -d "$TARGET_DIR/bin" ]; then
        mkdir -p $TARGET_DIR/bin
    fi

    if [ ! -d "$TARGET_DIR/.bitcoin" ]; then
        mkdir -p $TARGET_DIR/.bitcoin
    fi

    if [ "$SYSTEM" = "Darwin" ]; then
        if [ ! -e "$HOME/Library/Application Support/Bitcoin" ]; then
            ln -s $TARGET_DIR/.bitcoin "$HOME/Library/Application Support/Bitcoin"
        fi
    else
        if [ ! -e "$HOME/.bitcoin" ]; then
            ln -s $TARGET_DIR/.bitcoin $HOME/.bitcoin
        fi
    fi

    if [ -f "$TARGET_DIR/bitcoin/src/bitcoind" ]; then
        # Install compiled binaries.
        cp "$TARGET_DIR/bitcoin/src/bitcoind" "$TARGET_DIR/bin/" &&
            cp "$TARGET_DIR/bitcoin/src/bitcoin-cli" "$TARGET_DIR/bin/" &&
            print_success "Bitcoin Core v$VERSION (compiled) installed successfully!"
    elif [ -f "$TARGET_DIR/bitcoin-$VERSION/bin/bitcoind" ]; then
        # Install downloaded binaries.
        cp "$TARGET_DIR/bitcoin-$VERSION/bin/bitcoind" "$TARGET_DIR/bin/" &&
            cp "$TARGET_DIR/bitcoin-$VERSION/bin/bitcoin-cli" "$TARGET_DIR/bin/" &&
                rm -rf "$TARGET_DIR/bitcoin-$VERSION"
            print_success "Bitcoin Core v$VERSION (binaries) installed successfully!"
    else
        print_error "Cannot find files to install."
        exit 1
    fi

    cat > $TARGET_DIR/.bitcoin/bitcoin.conf <<EOF
### IPv4/IPv6 mode ###
# This mode requires uPnP feature on your router to allow Bitcoin Core to accept incoming connections.
bind=0.0.0.0
upnp=1

### Tor mode ###
# This mode requires tor (https://www.torproject.org/download/) to be running at the proxy address below.
# No configuration is needed on your router to allow Bitcoin Core to accept incoming connections.
#proxy=127.0.0.1:9050
#bind=127.0.0.1
#onlynet=onion

listen=1
port=$PORT
maxconnections=64

dbcache=64
par=2
checkblocks=24
checklevel=0

disablewallet=1

rpccookiefile=$TARGET_DIR/.bitcoin/.cookie
rpcbind=127.0.0.1
rpcport=8332
rpcallowip=127.0.0.1
EOF
    chmod go-rw $TARGET_DIR/.bitcoin/bitcoin.conf

    cat > $TARGET_DIR/bin/start.sh <<EOF
#!/bin/sh
if [ -f $TARGET_DIR/bin/bitcoind ]; then
    $TARGET_DIR/bin/bitcoind -conf=$TARGET_DIR/.bitcoin/bitcoin.conf -datadir=$TARGET_DIR/.bitcoin -daemon
fi
EOF
    chmod ugo+x $TARGET_DIR/bin/start.sh

    cat > $TARGET_DIR/bin/stop.sh <<EOF
#!/bin/sh
if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
    kill \$(cat $TARGET_DIR/.bitcoin/bitcoind.pid)
fi
EOF
    chmod ugo+x $TARGET_DIR/bin/stop.sh
}

start_bitcoin_core() {
    if [ ! -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
        print_info "\nStarting Bitcoin Core.."
        cd $TARGET_DIR/bin && ./start.sh

        timer=0
        until [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ] || [ $timer -eq 5 ]; do
            timer=$((timer + 1))
            sleep $timer
        done

        if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
            print_success "Bitcoin Core is running!"
        else
            print_error "Failed to start Bitcoin Core."
            exit 1
        fi
    fi
}

stop_bitcoin_core() {
    if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
        print_info "\nStopping Bitcoin Core.."
        cd $TARGET_DIR/bin && ./stop.sh

        timer=0
        until [ ! -f $TARGET_DIR/.bitcoin/bitcoind.pid ] || [ $timer -eq 120 ]; do
            timer=$((timer + 1))
            sleep $timer
        done

        if [ ! -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
            print_success "Bitcoin Core stopped."
        else
            print_error "Failed to stop Bitcoin Core."
            exit 1
        fi
    fi
}

check_bitcoin_core() {
    if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
        if [ -f $TARGET_DIR/bin/bitcoin-cli ]; then
            print_info "\nChecking Bitcoin Core.."
            sleep 5
            $TARGET_DIR/bin/bitcoin-cli -conf=$TARGET_DIR/.bitcoin/bitcoin.conf -datadir=$TARGET_DIR/.bitcoin getnetworkinfo
        fi

        reachable=$(curl -I https://bitnodes.io/api/v1/nodes/me-$PORT/ 2> /dev/null | head -n 1 | cut -d ' ' -f2)
        if [ $reachable -eq 200 ]; then
            print_success "Bitcoin Core is accepting incoming connections at port $PORT!"
        else
            print_warning "Bitcoin Core is not accepting incoming connections at port $PORT. You may need to configure port forwarding (https://bitcoin.org/en/full-node#port-forwarding) on your router."
        fi
    fi
}

uninstall_bitcoin_core() {
    stop_bitcoin_core

    if [ -d "$TARGET_DIR" ]; then
        print_info "\nUninstalling Bitcoin Core.."
        rm -rf $TARGET_DIR

        # Remove stale symlink.
        if [ "$SYSTEM" = "Darwin" ]; then
            if [ -L "$HOME/Library/Application Support/Bitcoin" ] && [ ! -d "$HOME/Library/Application Support/Bitcoin" ]; then
                rm "$HOME/Library/Application Support/Bitcoin"
            fi
        else
            if [ -L $HOME/.bitcoin ] && [ ! -d $HOME/.bitcoin ]; then
                rm $HOME/.bitcoin
            fi
        fi

        if [ ! -d "$TARGET_DIR" ]; then
            print_success "Bitcoin Core uninstalled successfully!"
        else
            print_error "Uninstallation failed. Is Bitcoin Core still running?"
            exit 1
        fi
    else
        print_error "Bitcoin Core not installed."
    fi
}

while getopts ":v:t:p:bu" opt
do
    case "$opt" in
        v)
            VERSION=${OPTARG}
            ;;
        t)
            TARGET_DIR=${OPTARG}
            ;;
        p)
            PORT=${OPTARG}
            ;;
        b)
            BUILD=1
            ;;
        u)
            UNINSTALL=1
            ;;
        h)
            usage
            exit 0
            ;;
        ?)
            usage >& 2
            exit 1
            ;;
    esac
done

WELCOME_TEXT=$(cat <<EOF

Welcome!

You are about to install a Bitcoin full node based on Bitcoin Core v$VERSION.

All files will be installed under $TARGET_DIR directory.

Your node will be configured to accept incoming connections from other nodes in
the Bitcoin network by using uPnP feature on your router.

For security reason, wallet functionality is not enabled by default.

After the installation, it may take several hours for your node to download a
full copy of the blockchain.

If you wish to uninstall Bitcoin Core later, you can download this script and
run "sh install-full-node.sh -u" or run this shortcut command
"sh <( curl -Ls https://bitnodes.io/install-full-node.sh ) -u"

EOF
)

print_start

if [ $UNINSTALL -eq 1 ]; then
    echo
    read -p "WARNING: This will stop Bitcoin Core and uninstall it from your system. Uninstall? (y/n) " answer
    if [ "$answer" = "y" ]; then
        uninstall_bitcoin_core
    fi
else
    echo "$WELCOME_TEXT"
    if [ -t 0 ]; then
        # Prompt for confirmation when invoked in tty.
        echo
        read -p "Install? (y/n) " answer
    else
        # Continue installation when invoked via pipe, e.g. curl .. | sh
        answer="y"
        echo
        echo "Starting installation in 15 seconds.."
        sleep 15
    fi
    if [ "$answer" = "y" ]; then
        if [ "$BUILD" -eq 0 ]; then
            bin_url=$(get_bin_url)
        else
            bin_url=""
        fi
        stop_bitcoin_core
        create_target_dir
        if [ "$bin_url" != "" ]; then
            download_bin "$bin_url"
        else
            install_build_dependencies && build_bitcoin_core
        fi
        install_bitcoin_core && start_bitcoin_core && check_bitcoin_core
        print_readme > $TARGET_DIR/README.md
        cat $TARGET_DIR/README.md
        print_success "If this is your first install, Bitcoin Core may take several hours/days to download a full copy of the blockchain."
        print_success "\nInstallation completed!"
    fi
fi

print_end