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#!/usr/bin/env bash
# Copyright (C) 2012-2017 VLC authors and VideoLAN
# Copyright (C) 2012-2014 Felix Paul Kühne <fkuehne at videolan dot org>
# Copyright (C) 2018-2021 Damiano Galassi <damiog@gmail.com>
# Copyright (C) 2018-2021 Bradley Sepos <bradley@bradleysepos.com>
#
# Based on VLC's codesign.sh
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.

NAME="hbsign"

set -e
set -u

SELF="${0}"
SELF_NAME=$(basename "${SELF}")
HELP="\
usage: ${SELF_NAME} [-hrs]
       ${SELF_NAME} identity application [application2 ...]
where:
   -h  display this help text
   -r  enable runtime hardening
   -s  enable sandbox
"

# Logs error message and exits
function exit_with_error {
    set +e
    ERROR="${2}"
    echo "${SELF_NAME}: ${ERROR}" >&2
    PRINT_HELP="${3:-false}"
    if [[ "${PRINT_HELP}" == true ]]; then
        echo -e "${HELP}"
    fi
    exit "${1}"
}

LOG="${NAME}.log"
touch "${LOG}" || exit_with_error 1 "${SELF_NAME}: unable to create log file ${LOG}"

OPTIND=1
RUNTIME=false
SANDBOX=false
while getopts ":hrs" OPT; do
    case "${OPT}" in
        h)
            # Print help and exit
            echo -e "${HELP}"
            exit 0
            ;;
        r)
            RUNTIME=true
            ;;
        s)
            SANDBOX=true
            ;;
        :)
            # Option without required argument
            exit_with_error 1 "${SELF_NAME}: option -${OPTARG} requires a value" true
            ;;
        \?)
            # Invalid option specified
            exit_with_error 1 "${SELF_NAME}: invalid option: -${OPTARG}" true
            ;;
    esac
done
shift $((${OPTIND} - 1))
IDENTITY="${1:-}"
if [[ "${IDENTITY}" == '' ]]; then
    exit_with_error 1 "${SELF_NAME}: identity not specified" true
fi
shift 1

if [[ ${#@} -eq 0 ]]; then
    exit_with_error 1 "${SELF_NAME}: application not specified" true
fi

SCRIPTDIR=$(dirname "${SELF}")
RUNTIME_FLAGS=""
if [[ "${RUNTIME}" == true ]]; then
    RUNTIME_FLAGS="--options=runtime"
fi
ENTITLEMENTS_MAIN_FLAGS=""
ENTITLEMENTS_XPC_FLAGS=""
ENTITLEMENTS_CLI_FLAGS=""
if [[ "${SANDBOX}" == true ]]; then
    ENTITLEMENTS_MAIN_FLAGS="--entitlements $SCRIPTDIR/HandBrake.entitlements"
    ENTITLEMENTS_XPC_FLAGS="--entitlements $SCRIPTDIR/HandBrakeXPCService/HandBrakeXPCService.entitlements"
    ENTITLEMENTS_CLI_FLAGS="--entitlements $SCRIPTDIR/HandBrakeXPCService/HandBrakeXPCService-RuntimeOnly.entitlements"
elif [[ "${RUNTIME}" == true ]]; then
    ENTITLEMENTS_MAIN_FLAGS="--entitlements $SCRIPTDIR/HandBrake-RuntimeOnly.entitlements"
    ENTITLEMENTS_XPC_FLAGS="--entitlements $SCRIPTDIR/HandBrakeXPCService/HandBrakeXPCService-RuntimeOnly.entitlements"
    ENTITLEMENTS_CLI_FLAGS="${ENTITLEMENTS_XPC_FLAGS}"
fi
ENTITLEMENTS_CLI_FLAGS="${ENTITLEMENTS_CLI_FLAGS:+$ENTITLEMENTS_CLI_FLAGS }--prefix fr.handbrake."

function sign {  # sign target flags
    local TARGET FLAGS ERR
    TARGET="${1:-}"
    if [[ "${TARGET}" == "" ]]; then
        ERR="${SELF_NAME}: target not specified to sign function"
        echo -e "${ERR}" >> "${LOG}"
        exit_with_error 1 "${ERR}"
    fi
    if [[ "${2:-}" == "main" ]]; then
        FLAGS="${ENTITLEMENTS_MAIN_FLAGS}"
    elif [[ "${2:-}" == "xpc" ]]; then
        FLAGS="${ENTITLEMENTS_XPC_FLAGS}"
    elif [[ "${2:-}" == "cli" ]]; then
        FLAGS="${ENTITLEMENTS_CLI_FLAGS}"
    else
        FLAGS=""
    fi
    codesign --force --verbose $RUNTIME_FLAGS $FLAGS -s "${IDENTITY}" "${TARGET}" >>"${LOG}" 2>&1 || exit_with_error 1 "Signing failed. More info may be available in ${LOG}"
}

function verify {  # verify target deep
    local TARGET FLAGS ERR
    TARGET="${1:-}"
    if [[ "${TARGET}" == "" ]]; then
        ERR="${SELF_NAME}: target not specified to verify function"
        echo -e "${ERR}" >> "${LOG}"
        exit_with_error 1 "${ERR}"
    fi
    if [[ "${2:-}" == "deep" ]]; then
        FLAGS="--deep --strict --verbose=4"
    else
        FLAGS="-vv"
    fi
    codesign --verify $FLAGS "${TARGET}" >>"${LOG}" 2>&1 || exit_with_error 1 "Validation failed. More info may be available in ${LOG}"
}

echo "Script dir: ${SCRIPTDIR}"
echo "Identity: ${IDENTITY}"
echo "Hardened runtime: ${RUNTIME}"
echo "Sandbox: ${SANDBOX}"

for TARGET in "${@}"; do

    TARGET="${TARGET#./}"

    if [[ "${TARGET##*/}" == 'HandBrake.app' ]]; then
        echo "${TARGET}:"

        find "${TARGET}"/Contents/Frameworks -type f -name ".DS_Store" -exec rm '{}' \; >/dev/null 2>&1
        find "${TARGET}"/Contents/Frameworks -type f -name "*.textile" -exec rm '{}' \; >/dev/null 2>&1
        find "${TARGET}"/Contents/Frameworks -type f -name "*.txt" -exec rm '{}' \; >/dev/null 2>&1
        rm -rf "${TARGET}"/Contents/Frameworks/Sparkle.framework/Resources/Updater.app
        rm -rf "${TARGET}"/Contents/Frameworks/Sparkle.framework/Resources/Autoupdate

        echo "  Signing Frameworks"
        sign "${TARGET}"/Contents/Frameworks/Sparkle.framework/Versions/A
        sign "${TARGET}"/Contents/Frameworks/HandBrakeKit.framework/Versions/A

        echo "  Signing Updater App"
        sign "${TARGET}"/Contents/XPCServices/org.sparkle-project.InstallerLauncher.xpc/Contents/MacOS/Updater.app
        sign "${TARGET}"/Contents/XPCServices/org.sparkle-project.InstallerLauncher.xpc/Contents/MacOS/Autoupdate

        echo "  Signing XPC Services"

        OIFS="${IFS}"
        IFS=$'\n'
        XPC=($(find -s "${TARGET}"/Contents/XPCServices -type d -regex ".*/HandBrakeXPCService[0-9]*\.xpc" 2>/dev/null))
        XPC_EXT=($(find -s "${TARGET}"/Contents/XPCServices -type d -regex ".*/org\.sparkle-project.*\.xpc" 2>/dev/null))
        IFS="${OIFS}"
        for FILE in "${XPC[@]}"; do
            sign "${FILE}" xpc
        done
        for FILE in "${XPC_EXT[@]}"; do
            sign "${FILE}"
        done

        echo "  Signing App Bundle"
        sign "${TARGET}" main

        echo "  Validating Frameworks"
        verify "${TARGET}"/Contents/Frameworks/Sparkle.framework
        verify "${TARGET}"/Contents/Frameworks/HandBrakeKit.framework

        echo "  Validating Updater App"
        verify "${TARGET}"/Contents/XPCServices/org.sparkle-project.InstallerLauncher.xpc/Contents/MacOS/Updater.app

        echo "  Validating XPC Services"
        for FILE in "${XPC[@]}" "${XPC_EXT[@]}"; do
            verify "${FILE}"
        done

        echo "  Validating App Bundle"
        verify "${TARGET}" deep

		if [ "${IDENTITY}" != "-" ]; then
        	echo "  Validating Execution Privileges"
	        spctl -a -t exec -vv "${TARGET}" >>"${LOG}" 2>&1 || exit_with_error 1 "Validation failed. More info may be available in ${LOG}"
	    fi
    elif [[ "${TARGET##*/}" == 'HandBrakeCLI' ]]; then
        echo "${TARGET}:"

        echo "  Signing Executable"
        sign "${TARGET}" cli

        echo "  Validating Executable"
        verify "${TARGET}" deep
    else
        exit_with_error 1 "This script does not know how to sign the specified target."
    fi

done

echo "Complete."
exit 0