#!/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


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


generate_config_file() {
    touch "$2"
    chown "root:$username" "$2"
    chmod 0640 "$2"
    sed -e "s/__KOHASITE__/$name/g" \
        -e "s/__OPACPORT__/80/g" \
        -e "s/__INTRAPORT__/$INTRAPORT/g" \
        -e "s/__OPACSERVER__/$domain/g" \
        -e "s/__INTRASERVER__/$intradomain/g" \
        -e "s/__ZEBRA_PASS__/$zebrapwd/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" \
        "/etc/koha/$1" > "$2"
}

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

getinstancemysqlpassword() {
    sed -n '/<pass>/s:.*>\(.*\)</pass>.*:\1:p' \
        "/etc/koha/sites/$1/koha-conf.xml"
}


# Set defaults and read config file, if it exists.
DOMAIN=""
INTRAPORT="8080"
INTRAPREFIX=""
INTRASUFFIX=""
DEFAULTSQL=""
if [ -e /etc/koha/koha-sites.conf ]
then
    . /etc/koha/koha-sites.conf
fi


# Parse command line.
[ "$#" = 2 ] || 
    die "Usage: $0 [--create-db|--request-db|--populate-db] instancename"
case "$1" in
  --create-db) op=create ;;
  --request-db) op=request ;;
  --populate-db) op=populate ;;
  *) die "Usage: $0 [--create-db|--request-db|--populate-db] instancename" ;;
esac

name="$2"
domain="$name$DOMAIN"
if [ "$INTRAPORT" = 80 ] || [ "$INTRAPORT" = "" ]
then
    intradomain="$INTRAPREFIX$name$INTRASUFFIX$DOMAIN"
else
    intradomain="$INTRAPREFIX$name$INTRASUFFIX$DOMAIN:$INTRAPORT"
fi


mysqldb="koha_$name"
mysqlhost="$(getmysqlhost)"
mysqluser="koha_$name"

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


if [ "$op" = create ] || [ "$op" = request ]
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="$(pwgen -1)"
    # Set up MySQL database for this instance.
    if [ "$op" = create ]
    then
        mysql --defaults-extra-file=/etc/mysql/koha-common.cnf <<eof
CREATE DATABASE \`$mysqldb\`;
CREATE USER \`$mysqluser\`@'%' 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
    # 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"


        # Change the default user's password.
        staffpass="$(pwgen -1)"
        staffdigest=$(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 = 3;
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 ]
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