#!/usr/bin/env bash
#  
# KeePassXC Release Preparation Helper
# Copyright (C) 2017 KeePassXC team <https://keepassxc.org/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 or (at your option)
# version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

printf "\e[1m\e[32mKeePassXC\e[0m Release Preparation Helper\n"
printf "Copyright (C) 2017 KeePassXC Team <https://keepassxc.org/>\n\n"


# -----------------------------------------------------------------------
#                        global default values
# -----------------------------------------------------------------------
RELEASE_NAME=""
APP_NAME="KeePassXC"
SRC_DIR="."
GPG_KEY="CFB4C2166397D0D2"
GPG_GIT_KEY=""
OUTPUT_DIR="release"
SOURCE_BRANCH=""
TARGET_BRANCH="master"
TAG_NAME=""
DOCKER_IMAGE=""
DOCKER_CONTAINER_NAME="keepassxc-build-container"
CMAKE_OPTIONS=""
COMPILER="g++"
MAKE_OPTIONS="-j8"
BUILD_PLUGINS="autotype http yubikey"
INSTALL_PREFIX="/usr/local"
BUILD_SOURCE_TARBALL=true
ORIG_BRANCH=""
ORIG_CWD="$(pwd)"

# -----------------------------------------------------------------------
#                          helper functions
# -----------------------------------------------------------------------
printUsage() {
    local cmd
    if [ "" == "$1" ] || [ "help" == "$1" ]; then
        cmd="COMMAND"
    elif [ "check" == "$1" ] || [ "merge" == "$1" ] || [ "build" == "$1" ] || [ "gpgsign" == "$1" ] || [ "appsign" == "$1" ]; then
        cmd="$1"
    else
        logError "Unknown command: '$1'\n"
        cmd="COMMAND"
    fi

    printf "\e[1mUsage:\e[0m $(basename $0) $cmd [options]\n"
    
    if [ "COMMAND" == "$cmd" ]; then
        cat << EOF

Commands:
  check      Perform a dry-run check, nothing is changed
  merge      Merge release branch into main branch and create release tags
  build      Build and package binary release from sources
  gpgsign    Sign previously compiled release packages with GPG
  appsign    Sign binaries with code signing certificates on Windows and macOS
  help       Show help for the given command
EOF
    elif [ "merge" == "$cmd" ]; then
        cat << EOF

Merge release branch into main branch and create release tags

Options:
  -v, --version        Release version number or name (required)
  -a, --app-name       Application name (default: '${APP_NAME}')
  -s, --source-dir     Source directory (default: '${SRC_DIR}')
  -g, --gpg-key        GPG key used to sign the merge commit and release tag,
                       leave empty to let Git choose your default key
                       (default: '${GPG_GIT_KEY}')
  -r, --release-branch Source release branch to merge from (default: 'release/VERSION')
      --target-branch  Target branch to merge to (default: '${TARGET_BRANCH}')
  -t, --tag-name       Override release tag name (defaults to version number)
  -h, --help           Show this help
EOF
    elif [ "build" == "$cmd" ]; then
        cat << EOF

Build and package binary release from sources

Options:
  -v, --version           Release version number or name (required)
  -a, --app-name          Application name (default: '${APP_NAME}')
  -s, --source-dir        Source directory (default: '${SRC_DIR}')
  -o, --output-dir        Output directory where to build the release
                          (default: '${OUTPUT_DIR}')
  -t, --tag-name          Release tag to check out (defaults to version number)
  -b, --build             Build sources after exporting release
  -d, --docker-image      Use the specified Docker image to compile the application.
                          The image must have all required build dependencies installed.
                          This option has no effect if --build is not set.
      --container-name    Docker container name (default: '${DOCKER_CONTAINER_NAME}')
                          The container must not exist already
  -c, --cmake-options     Additional CMake options for compiling the sources
      --compiler          Compiler to use (default: '${COMPILER}')
  -m, --make-options      Make options for compiling sources (default: '${MAKE_OPTIONS}')
  -i, --install-prefix    Install prefix (default: '${INSTALL_PREFIX}')
  -p, --plugins           Space-separated list of plugins to build
                          (default: ${BUILD_PLUGINS})
  -n, --no-source-tarball Don't build source tarball
  -h, --help              Show this help
EOF
    elif [ "gpgsign" == "$cmd" ]; then
        cat << EOF

Sign previously compiled release packages with GPG

Options:
  -f, --files        Files to sign (required)
  -g, --gpg-key      GPG key used to sign the files (default: '${GPG_KEY}')
  -h, --help         Show this help
EOF
    elif [ "appsign" == "$cmd" ]; then
        cat << EOF

Sign binaries with code signing certificates on Windows and macOS

Options:
  -f, --files        Files to sign (required)
  -k, --signtool-key Key to be used with signtool (required for Windows EXE)
  -i, --identity     Apple Developer ID to be used with codesign (required for macOS APP and DMG)
  -h, --help         Show this help
EOF
    fi
}

logInfo() {
    printf "\e[1m[ \e[34mINFO\e[39m ]\e[0m $1\n"
}

logError() {
    printf "\e[1m[ \e[31mERROR\e[39m ]\e[0m $1\n" >&2
}

init() {
    if [ "" == "$RELEASE_NAME" ]; then
        logError "Missing arguments, --version is required!\n"
        printUsage "check"
        exit 1
    fi

    if [ "" == "$TAG_NAME" ]; then
        TAG_NAME="$RELEASE_NAME"
    fi
    
    if [ "" == "$SOURCE_BRANCH" ]; then
        SOURCE_BRANCH="release/${RELEASE_NAME}"
    fi

    ORIG_CWD="$(pwd)"
    SRC_DIR="$(realpath "$SRC_DIR")"
    cd "$SRC_DIR" > /dev/null 2>&1
    ORIG_BRANCH="$(git rev-parse --abbrev-ref HEAD 2> /dev/null)"
    cd "$ORIG_CWD"
}

cleanup() {
    logInfo "Checking out original branch..."
    if [ "" != "$ORIG_BRANCH" ]; then
        git checkout "$ORIG_BRANCH" > /dev/null 2>&1
    fi
    logInfo "Leaving source directory..."
    cd "$ORIG_CWD"
}

exitError() {
    logError "$1"
    cleanup
    exit 1
}

exitTrap() {
    exitError "Existing upon user request..."
}

checkSourceDirExists() {
    if [ ! -d "$SRC_DIR" ]; then
        exitError "Source directory '${SRC_DIR}' does not exist!"
    fi
}

checkOutputDirDoesNotExist() {
    if [ -e "$OUTPUT_DIR" ]; then
        exitError "Output directory '$OUTPUT_DIR' already exists. Please choose a different location!"
    fi
}

checkGitRepository() {
    if [ ! -d .git ] || [ ! -f CHANGELOG ]; then
        exitError "Source directory is not a valid Git repository!"
    fi
}

checkTagExists() {
    git tag | grep -q "$TAG_NAME"
    if [ $? -ne 0 ]; then
        exitError "Tag '${TAG_NAME}' does not exist!"
    fi
}

checkReleaseDoesNotExist() {
    git tag | grep -q "$TAG_NAME"
    if [ $? -eq 0 ]; then
        exitError "Release '$RELEASE_NAME' (tag: '$TAG_NAME') already exists!"
    fi
}

checkWorkingTreeClean() {
    git diff-index --quiet HEAD --
    if [ $? -ne 0 ]; then
        exitError "Current working tree is not clean! Please commit or unstage any changes."
    fi
}

checkSourceBranchExists() {
    git rev-parse "$SOURCE_BRANCH" > /dev/null 2>&1
    if [ $? -ne 0 ]; then
        exitError "Source branch '$SOURCE_BRANCH' does not exist!"
    fi
}

checkTargetBranchExists() {
    git rev-parse "$TARGET_BRANCH" > /dev/null 2>&1
    if [ $? -ne 0 ]; then
        exitError "Target branch '$TARGET_BRANCH' does not exist!"
    fi
}

checkVersionInCMake() {
    local app_name_upper="$(echo "$APP_NAME" | tr '[:lower:]' '[:upper:]')"
    local major_num="$(echo ${RELEASE_NAME} | cut -f1 -d.)"
    local minor_num="$(echo ${RELEASE_NAME} | cut -f2 -d.)"
    local patch_num="$(echo ${RELEASE_NAME} | cut -f3 -d.)"

    grep -q "${app_name_upper}_VERSION_MAJOR \"${major_num}\"" CMakeLists.txt
    if [ $? -ne 0 ]; then
        exitError "${app_name_upper}_VERSION_MAJOR not updated to '${major_num}' in CMakeLists.txt!"
    fi

    grep -q "${app_name_upper}_VERSION_MINOR \"${minor_num}\"" CMakeLists.txt
    if [ $? -ne 0 ]; then
        exitError "${app_name_upper}_VERSION_MINOR not updated to '${minor_num}' in CMakeLists.txt!"
    fi

    grep -q "${app_name_upper}_VERSION_PATCH \"${patch_num}\"" CMakeLists.txt
    if [ $? -ne 0 ]; then
        exitError "${app_name_upper}_VERSION_PATCH not updated to '${patch_num}' in CMakeLists.txt!"
    fi
}

checkChangeLog() {
    if [ ! -f CHANGELOG ]; then
        exitError "No CHANGELOG file found!"
    fi
    
    grep -qPzo "${RELEASE_NAME} \(\d{4}-\d{2}-\d{2}\)\n=+\n" CHANGELOG
    if [ $? -ne 0 ]; then
        exitError "'CHANGELOG' has not been updated to the '${RELEASE_NAME}' release!"
    fi
}

checkAppStreamInfo() {
    if [ ! -f share/linux/org.keepassxc.KeePassXC.appdata.xml ]; then
        exitError "No AppStream info file found!"
    fi

    grep -qPzo "<release version=\"${RELEASE_NAME}\" date=\"\d{4}-\d{2}-\d{2}\">" share/linux/org.keepassxc.KeePassXC.appdata.xml
    if [ $? -ne 0 ]; then
        exitError "'share/linux/org.keepassxc.KeePassXC.appdata.xml' has not been updated to the '${RELEASE_NAME}' release!"
    fi
}

checkSnapcraft() {
    if [ ! -f snapcraft.yaml ]; then
        echo "No snapcraft file found!"
        return
    fi

    grep -qPzo "version: ${RELEASE_NAME}" snapcraft.yaml
    if [ $? -ne 0 ]; then
        exitError "'snapcraft.yaml' has not been updated to the '${RELEASE_NAME}' release!"
    fi
}

checkTransifexCommandExists() {
    command -v tx > /dev/null
    if [ 0 -ne $? ]; then
        exitError "Transifex tool 'tx' not installed! Please install it using 'pip install transifex-client'."
    fi
}

checkOsslsigncodeCommandExists() {
    command -v osslsigncode > /dev/null
    if [ 0 -ne $? ]; then
        exitError "osslsigncode command not found on the PATH! Please install it using 'pacman -S mingw-w64-osslsigncode'."
    fi
}

checkCodesignCommandExists() {
    command -v codesign > /dev/null
    if [ 0 -ne $? ]; then
        exitError "codesign command not found on the PATH! Please check that you have correctly installed Xcode."
    fi
}

checkCreateDMGCommandExists() {
    command -v create-dmg > /dev/null
    if [ 0 -ne $? ]; then
        exitError "create-dmg command not found on the PATH! Please install it using 'npm install --global create-dmg'."
    fi
}

checkQt5LUpdateExists() {
    command -v lupdate > /dev/null
    if [ 0 -eq $? ] && ! $(lupdate -version | grep -q "lupdate version 5\."); then
        command -v lupdate-qt5 > /dev/null
        if [ 0 -ne $? ]; then
            exitError "Qt Linguist tool (lupdate-qt5) is not installed! Please install using 'apt install qttools5-dev-tools'"
        fi
    fi
}

performChecks() {
    logInfo "Performing basic checks..."
    
    checkSourceDirExists

    logInfo "Changing to source directory..."
    cd "${SRC_DIR}"
    
    logInfo "Validating toolset and repository..."

    checkTransifexCommandExists
    checkQt5LUpdateExists
    checkGitRepository
    checkReleaseDoesNotExist
    checkWorkingTreeClean
    checkSourceBranchExists
    checkTargetBranchExists
    
    logInfo "Checking out '${SOURCE_BRANCH}'..."
    git checkout "$SOURCE_BRANCH"
    
    logInfo "Attempting to find '${RELEASE_NAME}' in various files..."

    checkVersionInCMake
    checkChangeLog
    checkAppStreamInfo
    checkSnapcraft
    
    logInfo "\e[1m\e[32mAll checks passed!\e[0m"
}

# re-implement realpath for OS X (thanks mschrag)
# https://superuser.com/questions/205127/
if ! $(command -v realpath > /dev/null); then
    realpath() {
        pushd . > /dev/null
        if [ -d "$1" ]; then
            cd "$1"
            dirs -l +0
        else
            cd "$(dirname "$1")"
            cur_dir=$(dirs -l +0)
            
            if [ "$cur_dir" == "/" ]; then
                echo "$cur_dir$(basename "$1")"
            else
                echo "$cur_dir/$(basename "$1")"
            fi
        fi
        popd > /dev/null
    }
fi


trap exitTrap SIGINT SIGTERM

# -----------------------------------------------------------------------
#                             check command
# -----------------------------------------------------------------------
check() {
    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;
        esac
        shift
    done

    init

    performChecks

    cleanup

    logInfo "Congrats! You can successfully merge, build, and sign KeepassXC."
}

# -----------------------------------------------------------------------
#                             merge command
# -----------------------------------------------------------------------
merge() {    
    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;
                
            -a|--app-name)
                APP_NAME="$2"
                shift ;;
            
            -s|--source-dir)
                SRC_DIR="$2"
                shift ;;
            
            -g|--gpg-key)
                GPG_GIT_KEY="$2"
                shift ;;
            
            -r|--release-branch)
                SOURCE_BRANCH="$2"
                shift ;;
            
            --target-branch)
                TARGET_BRANCH="$2"
                shift ;;
            
            -t|--tag-name)
                TAG_NAME="$2"
                shift ;;
            
            -h|--help)
                printUsage "merge"
                exit ;;
            
            *)
                logError "Unknown option '$arg'\n"
                printUsage "merge"
                exit 1 ;;
        esac
        shift
    done

    init

    performChecks
    
    logInfo "Updating language files..."
    ./share/translations/update.sh
    if [ 0 -ne $? ]; then
        exitError "Updating translations failed!"
    fi
    git diff-index --quiet HEAD --
    if [ $? -ne 0 ]; then
        git add ./share/translations/*
        logInfo "Committing changes..."
        if [ "" == "$GPG_GIT_KEY" ]; then
            git commit -m "Update translations"
        else
            git commit -m "Update translations" -S"$GPG_GIT_KEY"
        fi
    fi

    CHANGELOG=$(grep -Pzo "(?<=${RELEASE_NAME} \(\d{4}-\d{2}-\d{2}\)\n)=+\n\n?(?:.|\n)+?\n(?=\n)" \
        CHANGELOG | grep -Pzo '(?<=\n\n)(.|\n)+' | tr -d \\0)
    COMMIT_MSG="Release ${RELEASE_NAME}"
    
    logInfo "Checking out target branch '${TARGET_BRANCH}'..."
    git checkout "$TARGET_BRANCH"
    
    logInfo "Merging '${SOURCE_BRANCH}' into '${TARGET_BRANCH}'..."

    git merge "$SOURCE_BRANCH" --no-ff -m "$COMMIT_MSG" -m "${CHANGELOG}" "$SOURCE_BRANCH" -S"$GPG_GIT_KEY"

    logInfo "Creating tag '${TAG_NAME}'..."
    if [ "" == "$GPG_GIT_KEY" ]; then
        git tag -a "$TAG_NAME" -m "$COMMIT_MSG" -m "${CHANGELOG}" -s
    else
        git tag -a "$TAG_NAME" -m "$COMMIT_MSG" -m "${CHANGELOG}" -s -u "$GPG_GIT_KEY"
    fi
    
    cleanup
    
    logInfo "All done!"
    logInfo "Please merge the release branch back into the develop branch now and then push your changes."
    logInfo "Don't forget to also push the tags using \e[1mgit push --tags\e[0m."
}

# -----------------------------------------------------------------------
#                             build command
# -----------------------------------------------------------------------
build() {    
    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;
                
            -a|--app-name)
                APP_NAME="$2"
                shift ;;
            
            -s|--source-dir)
                SRC_DIR="$2"
                shift ;;
            
            -o|--output-dir)
                OUTPUT_DIR="$2"
                shift ;;
            
            -t|--tag-name)
                TAG_NAME="$2"
                shift ;;
            
            -d|--docker-image)
                DOCKER_IMAGE="$2"
                shift ;;
            
            --container-name)
                DOCKER_CONTAINER_NAME="$2"
                shift ;;
            
            -c|--cmake-options)
                CMAKE_OPTIONS="$2"
                shift ;;
            
            --compiler)
                COMPILER="$2"
                shift ;;
            
            -m|--make-options)
                MAKE_OPTIONS="$2"
                shift ;;
            
            -i|--install-prefix)
                INSTALL_PREFIX="$2"
                shift ;;
            
            -p|--plugins)
                BUILD_PLUGINS="$2"
                shift ;;
            
            -n|--no-source-tarball)
                BUILD_SOURCE_TARBALL=false ;;
            
            -h|--help)
                printUsage "build"
                exit ;;
            
            *)
                logError "Unknown option '$arg'\n"
                printUsage "build"
                exit 1 ;;
        esac
        shift
    done

    init
    checkWorkingTreeClean

    OUTPUT_DIR="$(realpath "$OUTPUT_DIR")"

    logInfo "Checking out release tag '${TAG_NAME}'..."
    git checkout "$TAG_NAME"

    logInfo "Creating output directory..."
    mkdir -p "$OUTPUT_DIR"

    if [ $? -ne 0 ]; then
        exitError "Failed to create output directory!"
    fi

    if $BUILD_SOURCE_TARBALL; then
        logInfo "Creating source tarball..."
        local app_name_lower="$(echo "$APP_NAME" | tr '[:upper:]' '[:lower:]')"
        TARBALL_NAME="${app_name_lower}-${RELEASE_NAME}-src.tar.xz"
        git archive --format=tar "$TAG_NAME" --prefix="${app_name_lower}-${RELEASE_NAME}/" \
            | xz -6 >  "${OUTPUT_DIR}/${TARBALL_NAME}"
    fi
    
    logInfo "Creating build directory..."
    mkdir -p "${OUTPUT_DIR}/build-release"
    cd "${OUTPUT_DIR}/build-release"
    
    logInfo "Configuring sources..."
    for p in $BUILD_PLUGINS; do
        CMAKE_OPTIONS="${CMAKE_OPTIONS} -DWITH_XC_$(echo $p | tr '[:lower:]' '[:upper:]')=On"
    done
    
    if [ "$COMPILER" == "g++" ]; then
        export CC=gcc
    elif [ "$COMPILER" == "clang++" ]; then
        export CC=clang
    fi
    export CXX="$COMPILER"
    
    if [ "" == "$DOCKER_IMAGE" ]; then
        if [ "$(uname -s)" == "Darwin" ]; then
            # Building on OS X
            local qt_vers="$(ls /usr/local/Cellar/qt5 2> /dev/null | sort -r | head -n1)"
            if [ "" == "$qt_vers" ]; then
                exitError "Couldn't find Qt5! Please make sure it is available in '/usr/local/Cellar/qt5'."
            fi
            export MACOSX_DEPLOYMENT_TARGET=10.7
            
            logInfo "Configuring build..."
            cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" \
                -DCMAKE_OSX_ARCHITECTURES=x86_64 -DWITH_CXX11=OFF \
                -DCMAKE_PREFIX_PATH="/usr/local/Cellar/qt5/${qt_vers}/lib/cmake" \
                -DQT_BINARY_DIR="/usr/local/Cellar/qt5/${qt_vers}/bin" $CMAKE_OPTIONS "$SRC_DIR"
            
            logInfo "Compiling and packaging sources..."
            make $MAKE_OPTIONS package
            
            mv "./${APP_NAME}-${RELEASE_NAME}.dmg" ../
        elif [ "$(uname -o)" == "Msys" ]; then
            # Building on Windows with Msys
            logInfo "Configuring build..."
            cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=Off -G"MSYS Makefiles" \
                -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" $CMAKE_OPTIONS "$SRC_DIR"
            
            logInfo "Compiling and packaging sources..."
            make $MAKE_OPTIONS package
            
            mv "./${APP_NAME}-${RELEASE_NAME}-"*.{exe,zip} ../
        else
            mkdir -p "${OUTPUT_DIR}/bin-release"
            
            # Building on Linux without Docker container
            logInfo "Configuring build..."
            cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=Off $CMAKE_OPTIONS \
                -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" \
                -DKEEPASSXC_DIST_TYPE=AppImage "$SRC_DIR"
                
            logInfo "Compiling sources..."
            make $MAKE_OPTIONS
            
            logInfo "Installing to bin dir..."
            make DESTDIR="${OUTPUT_DIR}/bin-release" install/strip
            
            logInfo "Creating AppImage..."
            ${SRC_DIR}/AppImage-Recipe.sh "$APP_NAME" "$RELEASE_NAME"
        fi
    else
        mkdir -p "${OUTPUT_DIR}/bin-release"
        
        logInfo "Launching Docker container to compile sources..."
        
        docker run --name "$DOCKER_CONTAINER_NAME" --rm \
            --cap-add SYS_ADMIN --security-opt apparmor:unconfined --device /dev/fuse \
            -e "CC=${CC}" -e "CXX=${CXX}" \
            -v "$(realpath "$SRC_DIR"):/keepassxc/src:ro" \
            -v "$(realpath "$OUTPUT_DIR"):/keepassxc/out:rw" \
            "$DOCKER_IMAGE" \
            bash -c "cd /keepassxc/out/build-release && \
                cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=Off $CMAKE_OPTIONS \
                    -DCMAKE_INSTALL_PREFIX=\"${INSTALL_PREFIX}\" /keepassxc/src && \
                make $MAKE_OPTIONS && make DESTDIR=/keepassxc/out/bin-release install/strip && \
                /keepassxc/src/AppImage-Recipe.sh "$APP_NAME" "$RELEASE_NAME""
        
        if [ 0 -ne $? ]; then
            exitError "Docker build failed!"
        fi
        
        logInfo "Build finished, Docker container terminated."
    fi
    
    cleanup
    
    logInfo "All done!"
}


# -----------------------------------------------------------------------
#                           gpgsign command
# -----------------------------------------------------------------------
gpgsign() {
    local sign_files=()

    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -f|--files)
                while [ "${2:0:1}" != "-" ] && [ $# -ge 2 ]; do
                    sign_files+=("$2")
                    shift
                done ;;

            -g|--gpg-key)
                GPG_KEY="$2"
                shift ;;

            -h|--help)
                printUsage "gpgsign"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "gpgsign"
                exit 1 ;;
        esac
        shift
    done
    
    if [ -z "${sign_files}" ]; then
        logError "Missing arguments, --files is required!\n"
        printUsage "gpgsign"
        exit 1
    fi

    for f in "${sign_files[@]}"; do
        if [ ! -f "$f" ]; then
            exitError "File '${f}' does not exist or is not a file!"
        fi

        logInfo "Signing file '${f}' using release key..."
        gpg --output "${f}.sig" --armor --local-user "$GPG_KEY" --detach-sig "$f"
        
        if [ 0 -ne $? ]; then
            exitError "Signing failed!"
        fi

        logInfo "Creating digest for file '${f}'..."
        local rp="$(realpath "$f")"
        local bname="$(basename "$f")"
        (cd "$(dirname "$rp")"; sha256sum "$bname"  > "${bname}.DIGEST")
    done
    
    logInfo "All done!"
}



# -----------------------------------------------------------------------
#                           appsign command
# -----------------------------------------------------------------------
appsign() {
    local sign_files=()
    local signtool_key
    local codesign_identity

    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -f|--files)
                while [ "${2:0:1}" != "-" ] && [ $# -ge 2 ]; do
                    sign_files+=("$2")
                    shift
                done ;;

            -k|--signtool-key)
                signtool_key="$2"
                shift ;;

            -i|--identity)
                codesign_identity="$2"
                shift ;;

            -h|--help)
                printUsage "appsign"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "appsign"
                exit 1 ;;
        esac
        shift
    done

    if [ -z "${sign_files}" ]; then
        logError "Missing arguments, --files is required!\n"
        printUsage "appsign"
        exit 1
    fi

    for f in "${sign_files[@]}"; do
        if [ ! -f "${f}" ]; then
            exitError "File '${f}' does not exist or is not a file!"
        fi
    done

    if [ "$(uname -s)" == "Darwin" ]; then
        if [ -z "${codesign_identity}" ]; then
            logError "Missing arguments, --identity is required on macOS!\n"
            printUsage "appsign"
            exit 1
        fi

        checkCodesignCommandExists
        checkCreateDMGCommandExists

        local orig_dir="$(pwd)"
        for f in "${sign_files[@]}"; do
            if [[ ${f: -4} == '.dmg' ]]; then
                logInfo "Unpacking disk image '${f}'..."
                local tmp_dir="/tmp/KeePassXC_${RANDOM}"
                mkdir -p ${tmp_dir}/{mnt,app}
                hdiutil attach -quiet -noautoopen -mountpoint ${tmp_dir}/mnt "${f}"
                cd ${tmp_dir}
                cp -a ./mnt/KeePassXC.app ./app
                hdiutil detach -quiet ${tmp_dir}/mnt

                if [ ! -d ./app/KeePassXC.app ]; then
                    cd "${orig_dir}"
                    exitError "Unpacking failed!"
                fi

                logInfo "Signing app using codesign..."
                codesign --sign "${codesign_identity}" --verbose --deep ./app/KeePassXC.app

                if [ 0 -ne $? ]; then
                    cd "${orig_dir}"
                    exitError "Signing failed!"
                fi

                logInfo "Repacking and signing disk image..."
                create-dmg ./app/KeePassXC.app
                cd "${orig_dir}"
                cp -f ${tmp_dir}/KeePassXC-*.dmg "${f}"
                rm -Rf ${tmp_dir}
            else
                logInfo "Skipping non-DMG file '${f}'..."
            fi
        done

    elif [ "$(uname -o)" == "Msys" ]; then
        if [ -z "${signtool_key}" ]; then
            logError "Missing arguments, --signtool-key is required on Windows!\n"
            printUsage "appsign"
            exit 1
        fi

        checkOsslsigncodeCommandExists

        if [[ ! -f "${signtool_key}" ]]; then
            exitError "Key file was not found!"
        fi

        read -s -p "Key password: " password
        echo

        for f in "${sign_files[@]}"; do
            if [[ ${f: -4} == '.exe' ]]; then
                logInfo "Signing file '${f}' using osslsigncode..."
                # output a signed exe; we have to use a different name due to osslsigntool limitations
                osslsigncode sign -pkcs12 "${signtool_key}" -pass "${password}" \
                    -t "http://timestamp.comodoca.com/authenticode" -in "${f}" -out "${f}.signed"

                if [ 0 -ne $? ]; then
                    rm -f "${f}.signed"
                    exitError "Signing failed!"
                fi

                # overwrite the original exe with the signed exe
                mv -f "${f}.signed" "${f}"
            else
                logInfo "Skipping non-EXE file '${f}'..."
            fi
        done

    else
        exitError "Unsupported platform for code signing!\n"
    fi

    logInfo "All done!"
}


# -----------------------------------------------------------------------
#                       parse global command line
# -----------------------------------------------------------------------
MODE="$1"
shift
if [ "" == "$MODE" ]; then
    logError "Missing arguments!\n"
    printUsage
    exit 1
elif [ "help" == "$MODE" ]; then
    printUsage "$1"
    exit
elif [ "check" == "$MODE" ] || [ "merge" == "$MODE" ] || [ "build" == "$MODE" ] || [ "gpgsign" == "$MODE" ] || [ "appsign" == "$MODE" ]; then
    ${MODE} "$@"
else
    printUsage "$MODE"
fi