#!/bin/sh
#
# koha-create -- Create a new Koha instance.
# Copyright 2010  Catalyst IT, Ltd
# 
# 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 3 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/>.


set -e

usage="Usage: $0 [--create-db|--request-db|--populate-db|--use-db] \
    [--marcflavor marc21|normarc|unimarc] \
    [--zebralang en|nb|fr|es] \
    [--defaultsql /path/to/some.sql] \
    [--configfile /path/to/config] [--passwdfile /path/to/passwd] \
    [--database database] [--adminuser n] instancename"

die() {
    echo "$@" 1>&2
    exit 1
}

# UPPER CASE VARIABLES - from configfile or default value
# lower case variables - generated within this script
generate_config_file() {
    touch "$2"
    chown "root:$username" "$2"
    chmod 0640 "$2"
    sed -e "s/__KOHASITE__/$name/g" \
        -e "s/__OPACPORT__/$OPACPORT/g" \
        -e "s/__INTRAPORT__/$INTRAPORT/g" \
        -e "s/__OPACSERVER__/$opacdomain/g" \
        -e "s/__INTRASERVER__/$intradomain/g" \
        -e "s/__ZEBRA_PASS__/$zebrapwd/g" \
        -e "s/__ZEBRA_MARC_FORMAT__/$ZEBRA_MARC_FORMAT/g" \
        -e "s/__ZEBRA_LANGUAGE__/$ZEBRA_LANGUAGE/g" \
        -e "s/__DB_NAME__/$mysqldb/g" \
        -e "s/__DB_HOST__/$mysqlhost/g" \
        -e "s/__DB_USER__/$mysqluser/g" \
        -e "s/__DB_PASS__/$mysqlpwd/g" \
        -e "s/__UNIXUSER__/$username/g" \
        -e "s/__UNIXGROUP__/$username/g" \
        -e "s/__PLUGINS_DIR__/\/var\/lib\/koha\/$name\/plugins/g" \
        "/etc/koha/$1" > "$2"
}

getmysqlhost() {
    awk '
        /^\[/ { inclient = 0 }
        /^\[client\]/ { inclient = 1 }
        inclient && /^ *host *=/ { print $3 }' \
        /etc/mysql/koha-common.cnf
}

getinstancemysqlpassword() {
    xmlstarlet sel -t -v 'yazgfs/config/pass' "/etc/koha/sites/$1/koha-conf.xml"
}

getinstancemysqluser() {
    xmlstarlet sel -t -v 'yazgfs/config/user' "/etc/koha/sites/$1/koha-conf.xml"
}

getinstancemysqldatabase() {
    xmlstarlet sel -t -v 'yazgfs/config/database' "/etc/koha/sites/$1/koha-conf.xml"
}

# Set defaults and read config file, if it exists.
DOMAIN=""
OPACPORT="80"
OPACPREFIX=""
OPACSUFFIX=""
INTRAPORT="8080"
INTRAPREFIX=""
INTRASUFFIX=""
DEFAULTSQL=""
ZEBRA_MARC_FORMAT="marc21"
ZEBRA_LANGUAGE="en"
ADMINUSER="1"
PASSWDFILE="/etc/koha/passwd"
if [ -e /etc/koha/koha-sites.conf ]
then
    . /etc/koha/koha-sites.conf
fi

[ $# -ge 2 ] && [ $# -le 16 ] || die $usage

TEMP=`getopt -o crpm:l:d:f:b:a: -l create-db,request-db,populate-db,use-db,marcflavor:,zebralang:,defaultsql:,configfile:,passwdfile:,database:,adminuser: \
     -n "$0" -- "$@"`

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

# Temporary variables for the command line options
CLO_ZEBRA_MARC_FORMAT=""
CLO_ZEBRA_LANGUAGE=""
CLO_DEFAULTSQL=""
CLO_ADMINUSER=""

while true ; do
	case "$1" in
		-c|--create-db) op=create ; shift ;;
		-r|--request-db) op=request ; shift ;;
		-p|--populate-db) op=populate ; shift ;;
        -u|--use-db) op=use ; shift ;;
		-m|--marcflavor) CLO_ZEBRA_MARC_FORMAT="$2" ; shift 2 ;;
		-l|--zebralang) CLO_ZEBRA_LANGUAGE="$2" ; shift 2 ;;
		-d|--defaultsql) CLO_DEFAULTSQL="$2" ; shift 2 ;;
		-f|--configfile) configfile="$2" ; shift 2 ;;
        -s|--passwdfile) CLO_PASSWDFILE="$2" ; shift 2 ;;
        -b|--database) CLO_DATABASE="$2" ; shift 2 ;;
		-a|--adminuser) CLO_ADMINUSER="$2" ; shift 2 ;;
		--) shift ; break ;;
		*) die "Internal error processing command line arguments" ;;
	esac
done

# Load the configfile given on the command line
if [ "$configfile" != "" ]
then
    if [ -e "$configfile" ]
    then
        . "$configfile"
    else
        die "$configfile does not exist.";
    fi
fi

# Make sure options from the command line get the highest precedence
if [ "$CLO_ZEBRA_MARC_FORMAT" != "" ]
then
    ZEBRA_MARC_FORMAT="$CLO_ZEBRA_MARC_FORMAT"
fi
if [ "$CLO_ZEBRA_LANGUAGE" != "" ]
then
    ZEBRA_LANGUAGE="$CLO_ZEBRA_LANGUAGE"
fi
if [ "$CLO_DEFAULTSQL" != "" ]
then
    DEFAULTSQL="$CLO_DEFAULTSQL"
fi
if [ "$CLO_ADMINUSER" != "" ]
then
    ADMINUSER="$CLO_ADMINUSER"
fi
if [ "$CLO_PASSWDFILE" != "" ]
then
    PASSWDFILE="$CLO_PASSWDFILE"
fi

name="$1"

opacdomain="$OPACPREFIX$name$OPACSUFFIX$DOMAIN"
intradomain="$INTRAPREFIX$name$INTRASUFFIX$DOMAIN"


if [ -f $PASSWDFILE ] && [ `cat $PASSWDFILE | grep "^$name:"` ]
then
    passwdline=`cat $PASSWDFILE | grep "^$name:"`
    mysqluser=`echo $passwdline | cut -d ":" -f 2`
    mysqlpwd=`echo $passwdline | cut -d ":" -f 3`
    mysqldb=`echo $passwdline | cut -d ":" -f 4`
fi

# The order of precedence for MySQL database name is:
# default < passwd file < command line
if [ "$mysqldb" = "" ]
then
    mysqldb="koha_$name"
fi
if [ "$CLO_DATABASE" != "" ]
then
    mysqldb="$CLO_DATABASE"
fi

if [ "$mysqluser" = "" ]
then
    mysqluser="koha_$name"
fi
mysqlhost="$(getmysqlhost)"

if [ "$op" = create ] || [ "$op" = request ] || [ "$op" = use ]
then
    if [ "$mysqlpwd" = "" ]
    then
        mysqlpwd="$(pwgen -s 16 1)"
    fi
else
    mysqlpwd="$(getinstancemysqlpassword $name)"
fi


if [ "$op" = create ] || [ "$op" = request ] || [ "$op" = use ]
then
    # Create new user and group.
    username="$name-koha"
    if getent passwd "$username" > /dev/null
    then
        die "User $username already exists."
    fi
    if getent group "$username" > /dev/null
    then
        die "Group $username already exists."
    fi
    adduser --no-create-home --disabled-login \
        --gecos "Koha instance $username" \
        --home "/var/lib/koha/$name" \
        --quiet "$username"

    # Create the site-specific directories.
    koha-create-dirs "$name"

    # Generate Zebra database password.
    zebrapwd="$(pwgen -s 16 1)"
    # Future enhancement: make this configurable for when your db is on
    # another server.
    mysql_hostname="localhost"
    # Set up MySQL database for this instance.
    if [ "$op" = create ]
    then
        mysql --defaults-extra-file=/etc/mysql/koha-common.cnf <<eof
CREATE DATABASE \`$mysqldb\`;
CREATE USER \`$mysqluser\`@'$mysql_hostname' IDENTIFIED BY '$mysqlpwd';
CREATE USER \`$mysqluser\`@'%' IDENTIFIED BY '$mysqlpwd';
GRANT ALL PRIVILEGES ON \`$mysqldb\`.* TO \`$mysqluser\`;
FLUSH PRIVILEGES;
eof
    fi #`

    if [ "$op" = use ]
    then
        mysql --defaults-extra-file=/etc/mysql/koha-common.cnf --force <<eof
CREATE USER \`$mysqluser\`@'$mysql_hostname' IDENTIFIED BY '$mysqlpwd';
CREATE USER \`$mysqluser\`@'%' IDENTIFIED BY '$mysqlpwd';
GRANT ALL PRIVILEGES ON \`$mysqldb\`.* TO \`$mysqluser\`;
FLUSH PRIVILEGES;
eof
    fi #`

    # Generate and install Apache site-available file and log dir.
    generate_config_file apache-site.conf.in \
        "/etc/apache2/sites-available/$name"
    mkdir "/var/log/koha/$name"
    chown "$username:$username" "/var/log/koha/$name"


    # Generate and install main Koha config file.
    generate_config_file koha-conf-site.xml.in \
        "/etc/koha/sites/$name/koha-conf.xml"

    # Generate and install Zebra config files.
    generate_config_file zebra-biblios-site.cfg.in \
        "/etc/koha/sites/$name/zebra-biblios.cfg"
    generate_config_file zebra-authorities-site.cfg.in \
        "/etc/koha/sites/$name/zebra-authorities.cfg"
    generate_config_file zebra-authorities-dom-site.cfg.in \
        "/etc/koha/sites/$name/zebra-authorities-dom.cfg"
    generate_config_file zebra.passwd.in \
        "/etc/koha/sites/$name/zebra.passwd"


    # Create a GPG-encrypted file for requesting a DB to be set up.
    if [ "$op" = request ]
    then
        touch "$name-db-request.txt"
        chmod 0600 "$name-db-request.txt"
        cat > "$name-db-request.txt" << eof
Please create a MySQL database and user on $mysqlhost as follows:

database name: $mysqldb
database user: $mysqluser
     password: $mysqlpwd

Thank you.
eof

        echo "See $name-db-request.txt for database creation request."
        echo "Please forward it to the right person, and then run"
        echo "$0 --populate-db $name"
        echo "Thanks."
    fi
fi


if [ "$op" = create ] || [ "$op" = populate ]
then
    # Re-fetch the passwords from the config we've generated, allows it
    # to be different from what we set, in case the user had to change
    # something.
    mysqluser=$(getinstancemysqluser $name)
    mysqldb=$(getinstancemysqldatabase $name)
    # Use the default database content if that exists.
    if [ -e "$DEFAULTSQL" ]
    then
        # Populate the database with default content.
        zcat "$DEFAULTSQL" |
        sed "s/__KOHASITE__/$name/g" |
        mysql --host="$mysqlhost" --user="$mysqluser" --password="$mysqlpwd" "$mysqldb"


        # Change the default user's password.
        staffpass="$(pwgen 12 1)"
        staffdigest=$(echo -n "$staffpass" |
                      perl -e '
                            use Digest::MD5 qw(md5_base64); 
                            while (<>) { print md5_base64($_), "\n"; }')
        mysql --host="$mysqlhost" --user="$mysqluser" \
--password="$mysqlpwd" <<eof
USE \`$mysqldb\`;
UPDATE borrowers 
SET password = '$staffdigest' 
WHERE borrowernumber = $ADMINUSER;
eof
        #`
        echo "staff user password is '$staffpass' but keep that secret"

        # Upgrade the database schema, just in case the dump was from an 
        # old version.
        koha-upgrade-schema "$name"
    else
        echo "Koha instance is empty, no staff user created."
    fi
fi


if [ "$op" = create ] || [ "$op" = populate ] || [ "$op" = use ]
then
    # Reconfigure Apache.
    a2ensite "$name"
    service apache2 restart

    # Start Zebra.
    koha-start-zebra "$name"
fi


if [ "$op" = request ]
then
    koha-disable "$name"
fi

echo <<eoh

Email for this instance is disabled. When you're ready to enable it, use:
koha-email-enable $name
eoh