#!/bin/bash -e

# Postinst script for PHPWiki.
# Written by Matt Brown <debian@mattb.net.nz>. 
# Based on the original PHPWiki postinst (in Perl) by Matthew Palmer
# Released under the GPL version 2.

# Use Debconf
. /usr/share/debconf/confmodule
# Use dbconfig-common
. /usr/share/dbconfig-common/dpkg/postinst

# The following functions are copied from the webapps-common package
# written by Sean Finney and hosted on Alioth. The package is not yet
# in unstable, so we have to copy the required functions into here for
# now. Upstream source can be found at 
# http://alioth.debian.org/projects/webapps-common/
# --- BEGIN webapps-common --
wc_httpd_apaches="apache apache-ssl apache-perl apache2"
wc_httpd_supported="$wc_httpd_apaches"
wc_httpd_installed(){
	local httpds
	if [ "$*" ]; then
		httpds=$*
	else
		httpds=$wc_httpd_supported
	fi
	for f in $httpds; do
		if test -x /usr/sbin/$f; then
			echo $f
		fi
	done
}
wc_httpd_running(){
	local httpds
	if [ "$*" ]; then
		httpds=$*
	else
		httpds=$wc_httpd_supported
	fi
	for f in $httpds; do
		if pgrep -x $f >/dev/null; then
			echo $f
		fi
	done
}
wc_httpd_invoke(){
	local httpds cmd err
	if [ ! "$1" ]; then
		echo "i need at least a command!" 2>&1
		return 1
	fi
	cmd="$1"
	shift
	if [ "$*" ]; then
		httpds=$*
	else
		httpds=`wc_httpd_running`
	fi
	for f in $httpds; do
		if [ -x /etc/init.d/$f ]; then
			invoke-rc.d $f $cmd || return $?
		fi
	done
}
wc_httpd_apache_include(){
	local h incfile httpds confdir
	if [ ! "$1" ]; then
		echo "i need at least a file!" 2>&1
		return 1
	fi
	incfile="$1"
	shift
	if [ ! "$1" ]; then
		echo "i also need a name!" 2>&1
		return 1
	fi
	name="$1"
	shift
	if [ ! -e "$incfile" ]; then
		echo "include file $incfile does not exist!" 2>&1
		return 1
	fi
	if [ "$*" ]; then
		httpds=$*
	else
		httpds=`wc_httpd_installed $wc_httpd_supported`
	fi
	for h in $httpds; do
		confdir="/etc/$h/conf.d"
		conflink="$confdir/${name}.conf"
		if [ -d "$confdir" -a ! -e "$conflink" ]; then
			ln -s "$incfile" "$conflink"
		fi
	done
}
# --- END webapps-common --
    
function upgrade_config_ini()
{
    confout=`tempfile`
    
    # Can only upgrade if there is an existing configuration
    if [ ! -f '/etc/phpwiki/index.php' ]; then
        handle_config_ini
        return;
    fi
    
    # Run the migration script
    /usr/share/phpwiki/migrate-phpwiki-config /usr/share/phpwiki/config/config-template.ini < /etc/phpwiki/index.php > $confout
    
    # Put the configuration file in place
    /usr/bin/ucf --debconf-ok $confout /etc/phpwiki/config.ini
    rm -f $confout

    # Ensure perms are all good
    chmod 0640 /etc/phpwiki/config.ini
    chgrp www-data /etc/phpwiki/config.ini
}

function handle_config_ini () 
{
    
    # The DB config fragment we need to dynamically generate
    dbconf=''
    dbtype='SQL'
    
    if [ -f '/etc/phpwiki/config.ini' ]; then
        n=`egrep "^[[:space:]]*DATABASE_TYPE[[:space:]]*=[[:space:]]*dba" /etc/phpwiki/config.ini | wc -l | sed 's/ //g'`
        if [ "$n" -ne "0" ]; then
            # We're still using dba
            dbtype='dba'
        fi
    fi
    
    if [ "$dbtype" == "dba" ]; then
        dbconf="DATABASE_TYPE = dba\n"
        dbconf="${dbconf}DATABASE_DBA_HANDLER = db4\n"
        dbconf="${dbconf}DATABASE_DIRECTORY = /var/lib/phpwiki\n"
    else
        # dbconfig-common managed installation
        . /etc/phpwiki/dbconf.tmp
        # Set some defaults incase the user declined dbconfig common's help
        # These defaults won't actually work, but will give the user an idea 
        # of what goes where.
        if [ -z "$dbtype" ]; then
            dbtype="sqlite"
            basepath="/var/lib/phpwiki"
            dbname="phpwiki_pagedb.sqlite"
        fi
        dbconf="DATABASE_TYPE = SQL\n"
        dbconf="${dbconf}DATABASE_DSN = \"$dbtype://"
        if [ "$dbtype" == "sqlite" ]; then
            dbconf="${dbconf}/$basepath/$dbname\"\n"
        else
            dbconf="${dbconf}${dbuser}"
            if [ "$dbpass" != "" ]; then
                dbconf="${dbconf}:${dbpass}"
            fi
            dbconf="${dbconf}@${dbserver}"
            if [ "$dbport" != "" ]; then
                dbconf="${dbconf}:${dbport}"
            fi
            dbconf="${dbconf}/${dbname}\"\n"
        fi
        dbconf="${dbconf}DATABASE_TIMEOUT = 10\n"
        dbconf="${dbconf}DATABASE_SESSION_TABLE = session\n"
    fi	
    
    confout=`tempfile`
    sed "s~##DBPARAMS##~$dbconf~g" < /usr/share/phpwiki/config/config-dist.ini > $confout
    
    /usr/bin/ucf --debconf-ok $confout /etc/phpwiki/config.ini
    rm -f $confout
    rm -f /etc/phpwiki/dbconf.tmp
    ucf --purge /etc/phpwiki/dbconf.tmp

    # Ensure perms are all good
    chmod 0640 /etc/phpwiki/config.ini
    chgrp www-data /etc/phpwiki/config.ini
    
}

function write_apache_conf ()
{
    
    apacheconf=`tempfile`;
    
    # Get configured docroot. Make sure it doesn't end in /
    db_get phpwiki/system/documentroot
    docroot="${RET/%\//}"
    
    # Access Control
    db_get phpwiki/system/accessible
    if [ "$RET" == "global" ]; then
        allowstr="allow from all"
    elif [ "$RET" == "localhost only" ]; then
        allowstr="allow from 127.0.0.1"
    else
        db_get phpwiki/system/localnet
        allowstr="allow from $RET"
    fi
    
    # Write the config
    cat > $apacheconf << __EOF__
Alias /phpwikidata              /usr/share/phpwiki/
Alias ${docroot}/               /usr/share/phpwiki/index.php/

<Directory /usr/share/phpwiki/>
    DirectoryIndex index.php
    Options +FollowSymLinks
    AllowOverride None
    Order allow,deny
    $allowstr
</Directory>
__EOF__

    /usr/bin/ucf --debconf-ok $apacheconf /etc/phpwiki/apache.conf
    rm -f $apacheconf
    chmod 0644 /etc/phpwiki/apache.conf
    
}

# Clear out any lingering Include directives which were used before 1.3.7-2
function clean_apache_config () 
{
    
    for srv in "apache apache-ssl apache-perl"; do
        dir="/etc/$srv"
        if [ ! -d $dir ]; then
            continue
        fi
        
        n=`grep "/etc/phpwiki/apache.conf" $dir/httpd.conf | wc -l | sed 's/ //g'`
        if [ "$n" -ne "0" ]; then
            tmpfile=`tempfile`
            grep -v '^Include /etc/phpwiki/apache.conf\$' $dir/httpd.conf > $tmpfile
            mv $tmpfile $dir/httpd.conf
        fi
    done
    
}

# Let dbconfig-common do its work
dbc_first_version="1.3.12p3-2"
dbc_generate_include="sh:/etc/phpwiki/dbconf.tmp"
dbc_dbfile_owner="root:www-data"
dbc_dbfile_perms="0664"
dbc_go phpwiki $@

# Process Command Line Arguments
if [ "$1" == "configure" ]; then
    
    if [ "$2" == "" -o "$2" == "<>" ]; then
        
        # Fresh Install
        handle_config_ini
        
    else
        # Upgrade

        # Remove old apache stuff
        if /usr/bin/dpkg --compare-versions "$2" lt "1.3.7-2"; then
            clean_apache_config
        fi
        
        # This is the biggest upgrade!
        # Upgrade config file and database
        if /usr/bin/dpkg --compare-versions "$2" lt "1.3.10-1"; then
            upgrade_config_ini
            db_title "PHPWiki Configuration Upgraded"
            db_input high phpwiki/notes/configupgrade || true
            db_go
        else 
            # Regenerate the config file incase new options are present
            # UCF will handle merging and user changes
            handle_config_ini
        fi
        
    fi
    
    # Always configure apache
    write_apache_conf
    wc_httpd_apache_include /etc/phpwiki/apache.conf phpwiki 
    wc_httpd_invoke reload
    
    # Make sure PHPwiki can write to the plugin cache directory
    chgrp www-data /var/cache/phpwiki
    chmod 0775 /var/cache/phpwiki

fi

#DEBHELPER#