#!/bin/bash
#
# 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/>.

# Read configuration variable file if it is present
[ -r /etc/default/koha-common ] && . /etc/default/koha-common

set -e

# include helper functions
if [ -f "/usr/share/koha/bin/koha-functions.sh" ]; then
    . "/usr/share/koha/bin/koha-functions.sh"
else
    echo "Error: /usr/share/koha/bin/koha-functions.sh not present." 1>&2
    exit 1
fi

usage()
{
    local scriptname=$0
    cat <<EOF

Creates new Koha instances.

Usage:

  $scriptname [DB usage mode] [options] instancename

DB usage mode:
  --create-db               Create a new database on localhost. (default).
  --request-db              Creates a instancename-db-request.txt file where
                            you adjust your DB settings and re-run with --populate-db.
  --populate-db             Finish the installation you started with --request-db after
                            you adjusted the instancename-db-request.txt file.
  --use-db                  Use this option if you already created and populated your DB.

Options:
  --marcflavor flavor       Set the MARC flavor. Valid values are marc21 (default),
                            normarc and unimarc.
  --zebralang lang          Choose the primary language for Zebra indexing. Valid
                            values are en (default), es, fr, nb, ru and uk.
  --auth-idx idx_mode       Set the indexing mode for authority records. Valid
                            values are dom (default) and grs1.
  --biblio-idx idx_mode     Set the indexing mode for bibliographic records.
                            Valid values are dom (default) and grs1.
  --use-memcached           Set the instance to make use of memcache.
  --memcached-servers str   Set a comma-separated list of host:port memcached servers.
  --memcached-prefix str    Set the desired prefix for the instance memcached namespace.
  --defaultsql some.sql     Specify a default SQL file to be loaded on the DB.
  --configfile cfg_file     Specify an alternate config file for reading default values.
  --passwdfile passwd       Specify an alternate passwd file.
  --database dbname         Enforce the use of the specified DB name (64 char limit)
  --adminuser n             Explicit the admin user ID in the DB. Relevant in
                            conjunction with --defaultsql and --populate-db.
  --help,-h                 Show this help.

Note: the instance name cannot be longer that 11 chars.

EOF
}

# 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__/$ZEBRA_LANGUAGE/g" \
        -e "s/__BIBLIOS_INDEXING_MODE__/$BIBLIOS_INDEXING_MODE/g" \
        -e "s/__AUTHORITIES_INDEXING_MODE__/$AUTHORITIES_INDEXING_MODE/g" \
        -e "s/__ZEBRA_BIBLIOS_CFG__/$ZEBRA_BIBLIOS_CFG/g" \
        -e "s/__ZEBRA_AUTHORITIES_CFG__/$ZEBRA_AUTHORITIES_CFG/g" \
        -e "s/__START_BIBLIOS_RETRIEVAL_INFO__/`echo $START_BIBLIOS_RETRIEVAL_INFO`/g" \
        -e "s/__END_BIBLIOS_RETRIEVAL_INFO__/`echo $END_BIBLIOS_RETRIEVAL_INFO`/g" \
        -e "s/__START_AUTHORITIES_RETRIEVAL_INFO__/`echo $START_AUTHORITIES_RETRIEVAL_INFO`/g" \
        -e "s/__END_AUTHORITIES_RETRIEVAL_INFO__/`echo $END_AUTHORITIES_RETRIEVAL_INFO`/g" \
        -e "s/__DB_NAME__/$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" \
        -e "s/__MEMCACHED_NAMESPACE__/$MEMCACHED_NAMESPACE/g" \
        -e "s/__MEMCACHED_SERVERS__/$MEMCACHED_SERVERS/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"
}

check_apache_config()
{

    # Check that mpm_itk is installed and enabled
    if ! /usr/sbin/apachectl -M 2> /dev/null | grep -q 'mpm_itk'; then
        # Check Apache version
        APACHE_DISABLE_MPM_MSG=""
        if /usr/sbin/apache2ctl -v | grep -q "Server version: Apache/2.4"; then
            # mpm_event or mpm_worker need to be disabled first. mpm_itk depends
            # on mpm_prefork, which is enabled if needed. See
            # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734865
            if /usr/sbin/apachectl -M 2> /dev/null | grep -q 'mpm_event'; then
                APACHE_DISABLE_MPM_MSG=" sudo a2dismod mpm_event ;"
            elif /usr/sbin/apachectl -M 2> /dev/null | grep -q 'mpm_worker'; then
                APACHE_DISABLE_MPM_MSG=" sudo a2dismod mpm_worker ;"
            # else mpm_prefork: a2enmod mpm_itk works
            fi
        # else Apache 2.2: a2enmod mpm_itk works
        fi

        cat 1>&2  <<EOM

Koha requires mpm_itk to be enabled within Apache in order to run.
Typically this can be enabled with:

   $APACHE_DISABLE_MPM_MSG sudo a2enmod mpm_itk
EOM

        die
    fi

    # Check that mod_rewrite is installed and enabled.
    if ! /usr/sbin/apachectl -M 2> /dev/null | grep -q 'rewrite_module'; then
        cat 1>&2  <<EOM

Koha requires mod_rewrite to be enabled within Apache in order to run.
Typically this can be enabled with:

    sudo a2enmod rewrite
EOM
        die
    fi

    # Check that the CGI module is installed and enabled
    # (Apache 2.4 may not have it by default.)
    if ! /usr/sbin/apachectl -M 2> /dev/null | grep -q 'cgi_module'; then
        cat 1>&2 << EOM
Koha requires mod_cgi to be enabled within Apache in order to run.
Typically this can be enabled with:

    sudo a2enmod cgi
EOM
        die
    fi

}

set_biblios_indexing_mode()
{
    local indexing_mode=$1
    local marc_format=$2

    case $indexing_mode in
        "dom")
            START_BIBLIOS_RETRIEVAL_INFO=`cat <<EOF
    <xi:include href="\/etc\/koha\/$marc_format-retrieval-info-bib-dom.xml"\n
                xmlns:xi="http:\/\/www.w3.org\/2001\/XInclude">\n
     <xi:fallback>\n
      <retrievalinfo>
EOF`

            END_BIBLIOS_RETRIEVAL_INFO=`cat <<EOF
      <\/retrievalinfo>\n
     <\/xi:fallback>\n
    <\/xi:include>
EOF`
            BIBLIOS_INDEXING_MODE="dom"
            ZEBRA_BIBLIOS_CFG="zebra-biblios-dom.cfg"
            ;;
        "grs1")
            START_BIBLIOS_RETRIEVAL_INFO="    <retrievalinfo>"
            END_BIBLIOS_RETRIEVAL_INFO="    <\/retrievalinfo>"
            BIBLIOS_INDEXING_MODE="grs1"
            ZEBRA_BIBLIOS_CFG="zebra-biblios.cfg"
            ;;
        *)
            die "Error: '$indexing_mode' is not a valid indexing mode for bibliographic records."
            ;;
    esac
}


set_authorities_indexing_mode()
{
    local indexing_mode=$1
    local marc_format=$2

    case $indexing_mode in
        "dom")
            START_AUTHORITIES_RETRIEVAL_INFO=`cat <<EOF
    <xi:include href="\/etc\/koha\/$marc_format-retrieval-info-auth-dom.xml"\n
                xmlns:xi="http:\/\/www.w3.org\/2001\/XInclude">\n
     <xi:fallback>\n
      <retrievalinfo>
EOF`

            END_AUTHORITIES_RETRIEVAL_INFO=`cat <<EOF
      <\/retrievalinfo>\n
     <\/xi:fallback>\n
    <\/xi:include>\n
EOF`
            AUTHORITIES_INDEXING_MODE="dom"
            ZEBRA_AUTHORITIES_CFG="zebra-authorities-dom.cfg"
            ;;
        "grs1")
            START_AUTHORITIES_RETRIEVAL_INFO="    <retrievalinfo>"
            END_AUTHORITIES_RETRIEVAL_INFO="    <\/retrievalinfo>"
            AUTHORITIES_INDEXING_MODE="grs1"
            ZEBRA_AUTHORITIES_CFG="zebra-authorities.cfg"
            ;;
        *)
            die "Error: '$indexing_mode' is not a valid indexing mode for authority records."
            ;;
    esac
}


set_memcached()
{
    local instance="$1"

    if [ "$CLO_MEMCACHED_SERVERS" != "" ]; then
        MEMCACHED_SERVERS=$CLO_MEMCACHED_SERVERS
    else
        if [ "$MEMCACHED_SERVERS" = "" ]; then
            MEMCACHED_SERVERS=$DEFAULT_MEMCACHED_SERVERS
        # else: was set by the koha-sites.conf file
        fi
    fi

    if [ "$CLO_MEMCACHED_PREFIX" != "" ]; then
        MEMCACHED_NAMESPACE="$CLO_MEMCACHED_PREFIX$instance"
    else
        if [ "$MEMCACHED_PREFIX" != "" ]; then
            MEMCACHED_NAMESPACE="$MEMCACHED_PREFIX$instance"
        else
            MEMCACHED_NAMESPACE="$DEFAULT_MEMCACHED_PREFIX$instance"
        fi
    fi

}

# 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"

# memcached variables
USE_MEMCACHED="no"
MEMCACHED_SERVERS=""
MEMCACHED_PREFIX=""
# hardcoded memcached defaults
DEFAULT_MEMCACHED_SERVERS="127.0.0.1:11211"
DEFAULT_MEMCACHED_PREFIX="koha_"

# Indexing mode variables (default is DOM)
BIBLIOS_INDEXING_MODE="dom"
AUTHORITIES_INDEXING_MODE="dom"

START_BIBLIOS_RETRIEVAL_INFO=""
END_BIBLIOS_RETRIEVAL_INFO=""
START_AUTHORITIES_RETRIEVAL_INFO=""
END_AUTHORITIES_RETRIEVAL_INFO=""

if [ -e /etc/koha/koha-sites.conf ]
then
    . /etc/koha/koha-sites.conf
fi

[ $# -ge 1 ] && [ $# -le 16 ] || ( usage ; die "Error: wrong parameters" )

TEMP=`getopt -o chrpm:l:d:f:b:a: -l create-db,request-db,populate-db,use-db,use-memcached,help,marcflavor:,auth-idx:,biblio-idx:,zebralang:,defaultsql:,configfile:,passwdfile:,database:,adminuser:,memcached-servers:,memcached-prefix:, \
     -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=""
CLO_BIBLIOS_INDEXING_MODE=""
CLO_AUTHORITIES_INDEXING_MODE=""
CLO_MEMCACHED_SERVERS=""
CLO_MEMCACHED_PREFIX=""


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 ;;
        --use-memcached)
            USE_MEMCACHED="yes" ; shift ;;
        --memcached-servers)
            CLO_MEMCACHED_SERVERS="$2" ; shift 2 ;;
        --memcached-prefix)
            CLO_MEMCACHED_PREFIX="$2" ; shift 2;;
        -m|--marcflavor)
            CLO_ZEBRA_MARC_FORMAT="$2" ; shift 2 ;;
        -l|--zebralang)
            CLO_ZEBRA_LANGUAGE="$2" ; shift 2 ;;
        --auth-idx)
            CLO_AUTHORITIES_INDEXING_MODE="$2" ; shift 2 ;;
        --biblio-idx)
            CLO_BIBLIOS_INDEXING_MODE="$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 ;;
        -h|--help)
            usage ; exit 0 ;;
        --)
            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

if [ "$CLO_BIBLIOS_INDEXING_MODE" !=  "" ]; then
    BIBLIOS_INDEXING_MODE=$CLO_BIBLIOS_INDEXING_MODE
fi

set_biblios_indexing_mode $BIBLIOS_INDEXING_MODE $ZEBRA_MARC_FORMAT


if [ "$CLO_AUTHORITIES_INDEXING_MODE" !=  "" ]; then
    AUTHORITIES_INDEXING_MODE=$CLO_AUTHORITIES_INDEXING_MODE
fi

set_authorities_indexing_mode $AUTHORITIES_INDEXING_MODE $ZEBRA_MARC_FORMAT

name="$1"

if [ "$USE_MEMCACHED" = "yes" ]; then
    set_memcached $name
elif [ "$CLO_MEMCACHED_SERVERS" != "" ] || \
     [ "$CLO_MEMCACHED_PREFIX" != "" ]; then

    MSG=`cat <<EOF

Error: you provided memcached configuration switches but memcached is not enabled.
Please set USE_MEMCACHED="yes" on /etc/koha/koha-sites.conf or use the
--use-memcached option switch to enable it.

EOF`

    usage ; die $MSG
else
    # Unset memcached-related variables
    MEMCACHED_SERVERS=""
    MEMCACHED_PREFIX=""
fi

# Are we root? If not, the mod_rewrite check will fail and be confusing, so
# we look into this first.
if [[ $UID -ne 0 ]]
then
    die "This script must be run with root privileges."
fi

# Check everything is ok with Apache, die otherwise
check_apache_config

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/$name.conf"
    mkdir "/var/log/koha/$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/$name/zebra-biblios.cfg"
    generate_config_file zebra-biblios-dom-site.cfg.in \
        "/etc/koha/sites/$name/zebra-biblios-dom.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 ] || [ "$op" = use ]
then
    # Reconfigure Apache.
    if ! {
        a2ensite "$name" > /dev/null 2>&1 ||
            a2ensite "${name}.conf" > /dev/null 2>&1
    }; then
        echo "Warning: problem enabling $name in Apache" >&2
    fi
    service apache2 restart

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

    if [ "$USE_INDEXER_DAEMON" = "yes" ]; then
        # Start Indexer daemon
        koha-indexer --start "$name"
    fi
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