#!/bin/bash
# postinst script for jitsi-meet-prosody
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

function generateRandomPassword() {
    cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 16
}

case "$1" in
    configure)

        # loading debconf
        . /usr/share/debconf/confmodule

        # try to get host from jitsi-videobridge
        db_get jitsi-videobridge/jvb-hostname
        if [ -z "$RET" ] ; then
            # server hostname
            db_set jitsi-videobridge/jvb-hostname "localhost"
            db_input critical jitsi-videobridge/jvb-hostname || true
            db_go
        fi
        JVB_HOSTNAME="$RET"

        db_get jitsi-videobridge/jvbsecret
        if [ -z "$RET" ] ; then
            db_input critical jitsi-videobridge/jvbsecret || true
            db_go
        fi
        JVB_SECRET="$RET"

        db_get jicofo/jicofo-authuser
        if [ -z "$RET" ] ; then
            db_input critical jicofo/jicofo-authuser || true
            db_go
        fi
        JICOFO_AUTH_USER="$RET"

        db_get jicofo/jicofo-authpassword
        if [ -z "$RET" ] ; then
            # if password is missing generate it, and store it
            JICOFO_AUTH_PASSWORD=`generateRandomPassword`
            db_set jicofo/jicofo-authpassword "$JICOFO_AUTH_PASSWORD"
        else
            JICOFO_AUTH_PASSWORD="$RET"
        fi

        db_get jicofo/jicofosecret
        if [ -z "$RET" ] ; then
            # if secret is missing generate it, and store it
            JICOFO_SECRET=`generateRandomPassword`
            db_set jicofo/jicofosecret "$JICOFO_SECRET"
        else
            JICOFO_SECRET="$RET"
        fi

        JICOFO_AUTH_DOMAIN="auth.$JVB_HOSTNAME"

        # detect dpkg-reconfigure, just delete old links
        db_get jitsi-meet-prosody/jvb-hostname
        JVB_HOSTNAME_OLD=$RET
        if [ -n "$RET" ] && [ ! "$JVB_HOSTNAME_OLD" = "$JVB_HOSTNAME" ] ; then
            rm -f /etc/prosody/conf.d/$JVB_HOSTNAME_OLD.cfg.lua
            rm -f /etc/prosody/certs/$JVB_HOSTNAME_OLD.key
            rm -f /etc/prosody/certs/$JVB_HOSTNAME_OLD.crt
        fi

        # stores the hostname so we will reuse it later, like in purge
        db_set jitsi-meet-prosody/jvb-hostname "$JVB_HOSTNAME"

        db_get jitsi-meet-prosody/turn-secret
        if [ -z "$RET" ] ; then
            # 8-chars random secret used for the turnserver
            TURN_SECRET=`generateRandomPassword`
            db_set jitsi-meet-prosody/turn-secret "$TURN_SECRET"
        else
            TURN_SECRET="$RET"
        fi

        # and we're done with debconf
        db_stop

        PROSODY_CONFIG_PRESENT="true"
        PROSODY_CREATE_JICOFO_USER="false"
        PROSODY_HOST_CONFIG="/etc/prosody/conf.avail/$JVB_HOSTNAME.cfg.lua"
        PROSODY_CONFIG_OLD="/etc/prosody/prosody.cfg.lua"
        # if there is no prosody config extract our template
        # check for config in conf.avail or check whether it wasn't already configured in main config
        if [ ! -f $PROSODY_HOST_CONFIG ] && ! grep -q "VirtualHost \"$JVB_HOSTNAME\"" $PROSODY_CONFIG_OLD; then
            PROSODY_CONFIG_PRESENT="false"
            mkdir -p /etc/prosody/conf.avail/
            mkdir -p /etc/prosody/conf.d/
            cp /usr/share/jitsi-meet-prosody/prosody.cfg.lua-jvb.example $PROSODY_HOST_CONFIG
            sed -i "s/jitmeet.example.com/$JVB_HOSTNAME/g" $PROSODY_HOST_CONFIG
            sed -i "s/focusSecret/$JICOFO_SECRET/g" $PROSODY_HOST_CONFIG
            sed -i "s/focusUser/$JICOFO_AUTH_USER/g" $PROSODY_HOST_CONFIG
            sed -i "s/__turnSecret__/$TURN_SECRET/g" $PROSODY_HOST_CONFIG
            if [ ! -f /etc/prosody/conf.d/$JVB_HOSTNAME.cfg.lua ]; then
                ln -s $PROSODY_HOST_CONFIG /etc/prosody/conf.d/$JVB_HOSTNAME.cfg.lua
            fi
            PROSODY_CREATE_JICOFO_USER="true"
            # on some distributions main prosody config doesn't include configs
            # from conf.d folder enable it as this where we put our config by default
            if ! grep -q "Include \"conf\.d\/\*\.cfg.lua\"" $PROSODY_CONFIG_OLD; then
                echo -e "\nInclude \"conf.d/*.cfg.lua\"" >> $PROSODY_CONFIG_OLD
            fi
        fi

        if [ "$PROSODY_CREATE_JICOFO_USER" = "true" ]; then
            # create 'focus@auth.domain' prosody user
            prosodyctl register $JICOFO_AUTH_USER $JICOFO_AUTH_DOMAIN $JICOFO_AUTH_PASSWORD
            # trigger a restart
            PROSODY_CONFIG_PRESENT="false"
        fi

        USER_EXISTS_CHECK=`prosodyctl adduser jvb@$JICOFO_AUTH_DOMAIN < /dev/null || true`
        if [ ! "$USER_EXISTS_CHECK" = "That user already exists" ]; then
            prosodyctl register jvb $JICOFO_AUTH_DOMAIN $JVB_SECRET || true
        fi

        # Check whether prosody config has the internal muc, if not add it,
        # as we are migrating configs
        if [ -f $PROSODY_HOST_CONFIG ] && ! grep -q "internal.auth.$JVB_HOSTNAME" $PROSODY_HOST_CONFIG; then
            echo -e "\nComponent \"internal.auth.$JVB_HOSTNAME\" \"muc\"" >> $PROSODY_HOST_CONFIG
            echo -e "    storage = \"memory\"" >> $PROSODY_HOST_CONFIG
            echo -e "    modules_enabled = { \"ping\"; }" >> $PROSODY_HOST_CONFIG
            echo -e "    admins = { \"$JICOFO_AUTH_USER@auth.$JVB_HOSTNAME\", \"jvb@auth.$JVB_HOSTNAME\" }" >> $PROSODY_HOST_CONFIG
        fi

        # Convert the old focus component config to the new one.
        # Old:
        # Component "focus.jitmeet.example.com"
        #     component_secret = "focusSecret"
        # New:
        # Component "focus.jitmeet.example.com" "client_proxy"
        #    target_address = "focus@auth.jitmeet.example.com"
        if grep -q "Component \"focus.$JVB_HOSTNAME\"" $PROSODY_HOST_CONFIG && ! grep "Component \"focus.$JVB_HOSTNAME\" \"client_proxy\"" $PROSODY_HOST_CONFIG ;then
            sed -i "s/Component \"focus.$JVB_HOSTNAME\"/Component \"focus.$JVB_HOSTNAME\" \"client_proxy\"\n    target_address = \"$JICOFO_AUTH_USER@auth.$JVB_HOSTNAME\"/g" $PROSODY_HOST_CONFIG
            PROSODY_CONFIG_PRESENT="false"
        fi

        # Old versions of jitsi-meet-prosody come with the extra plugin path commented out (https://github.com/jitsi/jitsi-meet/commit/e11d4d3101e5228bf956a69a9e8da73d0aee7949)
        # Make sure it is uncommented, as it contains required modules.
        if grep -q -- '--plugin_paths = { "/usr/share/jitsi-meet/prosody-plugins/" }' $PROSODY_HOST_CONFIG ;then
            sed -i 's#--plugin_paths = { "/usr/share/jitsi-meet/prosody-plugins/" }#plugin_paths = { "/usr/share/jitsi-meet/prosody-plugins/" }#g' $PROSODY_HOST_CONFIG
            PROSODY_CONFIG_PRESENT="false"
        fi

        # Make sure the focus@auth user's roster includes the proxy component (this is idempotent)
        prosodyctl mod_roster_command subscribe focus.$JVB_HOSTNAME $JICOFO_AUTH_USER@auth.$JVB_HOSTNAME

        if [ ! -f /var/lib/prosody/$JVB_HOSTNAME.crt ]; then
            # prosodyctl takes care for the permissions
            # echo for using all default values
            echo | prosodyctl cert generate $JVB_HOSTNAME

            ln -sf /var/lib/prosody/$JVB_HOSTNAME.key /etc/prosody/certs/$JVB_HOSTNAME.key
            ln -sf /var/lib/prosody/$JVB_HOSTNAME.crt /etc/prosody/certs/$JVB_HOSTNAME.crt
        fi

        PRTRUNK_INSTALL_CHECK="$(dpkg-query -f '${Status}' -W 'prosody-trunk' 2>/dev/null | awk '{print $3}' || true)"
        PR10_INSTALL_CHECK="$(dpkg-query -f '${Status}' -W 'prosody-0.10' 2>/dev/null | awk '{print $3}' || true)"
        PR_VER_INSTALLED=$(dpkg-query -f='${Version}\n' --show prosody  2>/dev/null || true)
        if [ "$PRTRUNK_INSTALL_CHECK" = "installed" ] \
            || [ "$PRTRUNK_INSTALL_CHECK" = "unpacked" ] ; then
            if [ -f $PROSODY_HOST_CONFIG ]; then
                sed -i 's/storage = \"memory\"/storage = \"null\"/g' $PROSODY_HOST_CONFIG

                # trigger a restart
                PROSODY_CONFIG_PRESENT="false"
            fi
        fi
        if [ "$PR10_INSTALL_CHECK" = "installed" ] \
            || [ "$PR10_INSTALL_CHECK" = "unpacked" ] \
            || dpkg --compare-versions "$PR_VER_INSTALLED" gt "0.10" ; then

            # if the version is 0.10.X (>0.10 and <0.11)
            if [ -f $PROSODY_HOST_CONFIG ] \
                && dpkg --compare-versions "$PR_VER_INSTALLED" lt "0.11" ; then
                sed -i 's/storage = \"memory\"/storage = \"none\"/g' $PROSODY_HOST_CONFIG

                # trigger a restart
                PROSODY_CONFIG_PRESENT="false"
            fi
        fi

        if [ ! -f /var/lib/prosody/$JICOFO_AUTH_DOMAIN.crt ]; then
            # prosodyctl takes care for the permissions
            # echo for using all default values
            echo | prosodyctl cert generate $JICOFO_AUTH_DOMAIN

            AUTH_KEY_FILE="/etc/prosody/certs/$JICOFO_AUTH_DOMAIN.key"
            AUTH_CRT_FILE="/etc/prosody/certs/$JICOFO_AUTH_DOMAIN.crt"

            ln -sf /var/lib/prosody/$JICOFO_AUTH_DOMAIN.key $AUTH_KEY_FILE
            ln -sf /var/lib/prosody/$JICOFO_AUTH_DOMAIN.crt $AUTH_CRT_FILE
            ln -sf /var/lib/prosody/$JICOFO_AUTH_DOMAIN.crt /usr/local/share/ca-certificates/$JICOFO_AUTH_DOMAIN.crt

            # we need to force updating certificates, in some cases java trust
            # store not get re-generated with latest changes
            update-ca-certificates -f

            # don't fail on systems with custom config ($PROSODY_HOST_CONFIG is missing)
            if [ -f $PROSODY_HOST_CONFIG ]; then
                # now let's add the ssl cert for the auth. domain (we use # as a sed delimiter cause filepaths are confused with default / delimiter)
                sed -i "s#VirtualHost \"$JICOFO_AUTH_DOMAIN\"#VirtualHost \"$JICOFO_AUTH_DOMAIN\"\n    ssl = {\n        key = \"$AUTH_KEY_FILE\";\n        certificate = \"$AUTH_CRT_FILE\";\n    \}#g" $PROSODY_HOST_CONFIG
            fi

            # trigger a restart
            PROSODY_CONFIG_PRESENT="false"
        fi

        if [ "$PROSODY_CONFIG_PRESENT" = "false" ]; then
            invoke-rc.d prosody restart || true
        fi
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0