#!/bin/bash

# SRTool - shell script to start "Security Response Tool"

# Copyright (C) 2013-2015 Intel Corp.
# Copyright (C) 2018 Wind River Systems

# 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 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 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/.

HELP="
Usage: source srt start|stop [webport=<address:port>]
    Optional arguments:
        [webport] Set the SRTool server port (default: localhost:8000)
        [noautoupdate] Disable the auto update server
"

databaseCheck()
{
    retval=0
    # you can always add a superuser later via
    # ../srt/manage.py createsuperuser --username=<ME>
    $MANAGE migrate --noinput || retval=1

    if [ $retval -eq 1 ] ; then
        echo "Failed migrations, aborting system start" 1>&2
        return $retval
    fi
    $MANAGE checksettings --traceback || retval=1

    if [ $retval -eq 1 ]; then
        printf "\nError while checking settings; aborting\n"
        return $retval
    fi

    return $retval
}

get_srt_env_settings() {
    mainapp="yp"
    # Apply all shell settings except default app 'yp'
    # Only look in directories with proper 'datasource.json' files
    for envscript in $(find ./bin -name "datasource.json") ; do
        envscript=${envscript/datasource.json/srtool_env.sh}
        if [ -f "$envscript" -a "$envscript" = "${envscript/bin\/yp/}" ] ; then
            . $envscript
        fi
    done
    # if no main app, default to 'yp'
    if [ -z "$SRT_MAIN_APP" ] ; then
        . ./bin/yp/srtool_env.sh
    fi
    echo "SRT_MAIN_APP=$SRT_MAIN_APP"
}

webserverKillAll()
{
    local pidfile
    for pidfile in ${SRT_BASE_DIR}/.srtmain.pid ; do
        if [ -f ${pidfile} ] ; then
            pid=`cat ${pidfile}`
            while kill -0 $pid 2>/dev/null; do
                echo "KILL:$pid"
                kill -SIGTERM -9 $pid 2>/dev/null
                sleep 1
            done
            rm  ${pidfile}
        fi
    done

    # Stop the Update app
    if [ 0 -eq $no_auto_update ] ; then
        ./bin/common/srtool_update.py --cron-stop
    fi
}

webserverStartAll()
{
    # do not start if srtmain points to a valid process
    if ! cat "${SRT_BASE_DIR}/.srtmain.pid" 2>/dev/null | xargs -I{} kill -0 {} ; then
        retval=1
        rm "${SRT_BASE_DIR}/.srtmain.pid"
    fi

    retval=0

    # check the database
    databaseCheck || return 1

    echo "Starting SRTool webserver..."

    $MANAGE runserver --noreload "$ADDR_PORT" \
           </dev/null >>${SRT_BASE_DIR}/srt_web.log 2>&1 \
           & echo $! >${SRT_BASE_DIR}/.srtmain.pid

    sleep 1

    if ! cat "${SRT_BASE_DIR}/.srtmain.pid" | xargs -I{} kill -0 {} ; then
        retval=1
        rm "${SRT_BASE_DIR}/.srtmain.pid"
        echo "SRTool webserver NOT STARTED"
    else
        echo "SRTool webserver started at http://$ADDR_PORT"
    fi

    # Start the Update app
    if [ 0 -eq $no_auto_update ] ; then
        ./bin/common/srtool_update.py --cron-start > /dev/null 2>&1 &
        echo "SRTool update service started at PID $!"
    fi
    return $retval
}

INSTOPSYSTEM=0

# define the stop command
stop_system()
{
    # prevent reentry
    if [ $INSTOPSYSTEM -eq 1 ] ; then return; fi
    INSTOPSYSTEM=1
    webserverKillAll
    # unset exported variables
    unset SRT_BASE_DIR
    trap - SIGHUP
    #trap - SIGCHLD
    INSTOPSYSTEM=0
}

verify_prereq() {
    # Quick check for Python3
    if [ -z "$(which python3)" ] ; then
        echo "ERROR: missing 'python3' host package"
        return 2
    fi
    if [ -z "$(which sqlite3)" ] ; then
        echo "ERROR: missing 'sqlite3' host package"
        return 2
    fi

    # Verify Django version
    reqfile=$(python3 -c "import os; print(os.path.realpath('$SRT_BASE_DIR/bin/srtool-requirements.txt'))")
    exp='s/Django\([><=]\+\)\([^,]\+\),\([><=]\+\)\(.\+\)/'
    # expand version parts to 2 digits to support 1.10.x > 1.8
    # (note:helper functions hard to insert in-line)
    exp=$exp'import sys,django;'
    # Allow for development versions like '2.2.dev20181217100344'
    exp=$exp'version=["%02d" % int(n) for n in django.get_version().replace("dev","").split(".")];'
    exp=$exp'vmin=["%02d" % int(n) for n in "\2".split(".")];'
    exp=$exp'vmax=["%02d" % int(n) for n in "\4".split(".")];'
    exp=$exp'sys.exit(not (version \1 vmin and version \3 vmax))'
    exp=$exp'/p'
    if ! sed -n "$exp" $reqfile | python3 - ; then
        req=`grep ^Django $reqfile`
        echo "This program needs $req"
        echo "Please install with pip3 install -r $reqfile"
        return 2
    fi

    return 0
}

create_restart() {
	cat > $SRT_BASE_DIR/bin/srt_start.sh << endmsg
#!/bin/bash
# Restart the SRTool using the last start options
if [ -f $SRT_BASE_DIR/.srtmain.pid ] ; then
    $SRT_BASE_DIR/bin/srt_stop.sh
fi
$SRT_BASE_DIR/bin/srt $*
endmsg
	chmod +x $SRT_BASE_DIR/bin/srt_start.sh
	cat > $SRT_BASE_DIR/bin/srt_stop.sh << endmsg
#!/bin/bash
# Stop the SRTool based on the the last start options
if [ 1 -eq $no_auto_update ] ; then
    $SRT_BASE_DIR/bin/srt stop noautoupdate
else
    $SRT_BASE_DIR/bin/srt stop
fi
endmsg
	chmod +x $SRT_BASE_DIR/bin/srt_stop.sh
}

# read command line parameters
if [ -n "$BASH_SOURCE" ] ; then
    SRT=${BASH_SOURCE}
elif [ -n "$ZSH_NAME" ] ; then
    SRT=${(%):-%x}
else
    SRT=$0
fi

# read command line parameters
if [ -n "$BASH_SOURCE" ] ; then
    SRT=${BASH_SOURCE}
elif [ -n "$ZSH_NAME" ] ; then
    SRT=${(%):-%x}
else
    SRT=$0
fi

# set up base paths and definitions
export SRT_BASE_DIR=$(dirname $SRT)
SRT_BASE_DIR=$(readlink -f $SRT_BASE_DIR)
SRT_BASE_DIR=$(dirname $SRT_BASE_DIR)
MANAGE="python3 $SRT_BASE_DIR/lib/manage.py"

# Fetch the datasource environent settings
get_srt_env_settings

# insure basic directories are present
mkdir -p $SRT_BASE_DIR/data
mkdir -p $SRT_BASE_DIR/data/cache
mkdir -p $SRT_BASE_DIR/update_logs
touch $SRT_BASE_DIR/update_logs/master_log.txt

ADDR_PORT="localhost:8000"
unset CMD
manage_cmd=""
if [ "1" = "$SRT_SKIP_AUTOUPDATE" ] ; then
    no_auto_update=1
else
    no_auto_update=0
fi
for param in $*; do
    case $param in
    start )
            CMD=$param
    ;;
    stop )
            CMD=$param
    ;;
    manage )
            CMD=$param
    ;;
    webport=*)
            ADDR_PORT="${param#*=}"
            # Split the addr:port string
            ADDR=`echo $ADDR_PORT | cut -f 1 -d ':'`
            PORT=`echo $ADDR_PORT | cut -f 2 -d ':'`
            # If only a port has been specified then set address to localhost.
            if [ $ADDR = $PORT ] ; then
                ADDR_PORT="localhost:$PORT"
            fi
    ;;
    noautoupdate )
            no_auto_update=1
    ;;
    --help)
            echo "$HELP"
            exit 0
    ;;
    *)
            if [ "manage" == "$CMD" ] ; then
                cd $SRT_BASE_DIR/lib
                manage_cmd="$manage_cmd $param"
            else
                echo "$HELP"
                exit 1
            fi
    ;;

    esac
done

verify_prereq || exit 1

# this defines the dir SRTool will use for
# 1) the sqlite db if that is being used.
# 2) pid's we need to clean up on exit/shutdown

# Determine the action. If specified by arguments, fine, if not, toggle it
if [ "$CMD" = "start" ] ; then
    if [ -n "$BBSERVER" ]; then
        echo " SRT is already running. Exiting..."
        exit 1
    fi
elif [ "$CMD" = "" ]; then
    echo "No command specified"
    echo "$HELP"
    exit 1
fi

echo "The system will $CMD."

# Execute the commands
case $CMD in
    start )
        # check if addr:port is not in use
        if [ "$CMD" == 'start' ] ; then
            $MANAGE checksocket "$ADDR_PORT" || exit 1
        fi

        if ! webserverStartAll; then
            echo "Failed ${CMD}."
            exit 4
        fi
        # create working directories for srtool
        mkdir -p $SRT_BASE_DIR/update_logs
        mkdir -p $SRT_BASE_DIR/backups
        mkdir -p $SRT_BASE_DIR/reports
        # set fail safe stop system on terminal exit
        trap stop_system SIGHUP
        echo "Successful ${CMD}."
        create_restart $*
        exit 0
    ;;
    stop )
        stop_system
        echo "Successful ${CMD}."
    ;;
    manage )
        $MANAGE $manage_cmd
    ;;


esac