#!/bin/bash
#
# priority: 600
#
# Configure Apache web server
#
# Mark Huang <mlhuang@cs.princeton.edu>
# Copyright (C) 2006 The Trustees of Princeton University
#

# Source function library and configuration
. /etc/plc.d/functions
. /etc/planetlab/plc_config

# Be verbose
set -x

# Default locations
DocumentRoot=/var/www/html
php_ini=/etc/php.ini
httpd_conf=/etc/httpd/conf/httpd.conf
ssl_conf=/etc/httpd/conf.d/ssl.conf
plc_conf=/etc/httpd/conf.d/plc.conf
php_fpm_conf=/etc/php-fpm.d/plc.conf
php_fpm_dir=$(dirname $php_fpm_conf)

function disable_file () {
    file=$1; shift
    [ -f $file ] && mv -f $file $file.disabled
}
function enable_file () {
    file=$1; shift
    [ ! -f $file ] && mv -f $file.disabled $file
}

case "$1" in
    start)
	if [ "$PLC_API_ENABLED" != "1" -a \
	     "$PLC_BOOT_ENABLED" != "1" -a \
	     "$PLC_WWW_ENABLED" != "1" ] ; then
	    exit 0
	fi

	MESSAGE=$"Starting web server"
	dialog "$MESSAGE"

	# set document root - not really useful on fedora but just in case
	sed -i -e "s@^DocumentRoot.*@DocumentRoot \"$DocumentRoot\"@" $httpd_conf
	# whether WWW is enabled or not :
	if [ "$PLC_WWW_ENABLED" != "1" ] ; then
	    # avoid hitting drupal, that would try to connect to the db and create noise
	    disable_file $DocumentRoot/index.php
	else
	    enable_file $DocumentRoot/index.php
	fi

	# Set the default include path
	include_path=".:$DocumentRoot/planetlab/includes:$DocumentRoot/plekit/php:$DocumentRoot/generated:/etc/planetlab/php:/usr/share/plc_api/php"
	sed -i -e "s@[;]*include_path = \"\.:.*\"@include_path = \"$include_path\"@" $php_ini

	# Set open_basedir so as to avoid leaks
	open_basedir="$DocumentRoot:/etc/planetlab/php:/usr/share/plc_api/php:/var/log/myslice:/var/tmp/bootmedium:/var/log/bm:/tmp"
	sed -i -e "s@[;]*open_basedir =.*@open_basedir = \"$open_basedir\"@" $php_ini

	# for php-5.3 under fedora12, otherwise issues tons of warning messages
	# Set timezone in php.ini if not already there
	if grep '^;date.timezone' $php_ini >& /dev/null; then
	    dialog 'Setting PHP timezone to GMT'
	    sed -i -e 's,^;date.timezone.*,date.timezone = GMT,' $php_ini
	fi

	if grep '^short_open_tag = Off' $php_ini >& /dev/null; then
	    sed -i -e 's,^short_open_tag = Off,short_open_tag = On,' $php_ini
	fi

	## patch php.ini
	# memory limit
	sed -i -e 's,^memory_limit = 32M *;,memory_limit = 80M ; patch myplc -- ,' $php_ini
	# log_errors : is On by default
	# error_log
	if ! grep '^error_log *=' $php_ini > /dev/null ; then
	  echo 'error_log = /var/log/php.log' >> $php_ini
	  touch /var/log/php.log
	  chmod 666 /var/log/php.log
	fi

        # configure php-fpm as well if present (starting with f27)
        if [ -d $php_fpm_dir ] ; then
            cat > $php_fpm_conf << EOF
[www]
php_value[include_path] = $include_path
php_value[open_basedir] = $open_basedir
php_value[date.timezone] = GMT
php_value[short_open_tag] = On
php_value[memory_limit] = 80M
EOF
            # this is needed because otherwise, the first time
            # we do this configuration, the service is already up
            # and the config is usable only the second time
            systemctl restart php-fpm
        fi

	# Disable default Listen directive
	sed -i -e '/^Listen/d' $httpd_conf

	plc_api_path_noslash=$(echo $PLC_API_PATH | sed -e s,/,,g)
	# Set the port numbers
	for server in WWW API BOOT ; do
	    enabled=PLC_${server}_ENABLED
	    if [ "${!enabled}" != "1" ] ; then
		continue
	    fi
	    hostname=PLC_${server}_HOST
	    http_port=PLC_${server}_PORT
	    https_port=PLC_${server}_SSL_PORT

	    # API should always be accessed via SSL
	    if [ "$server" = "API" ] ; then
		https_port=${!http_port}
		http_port=
	    fi

	    # Check if we are already listening on these ports
	    skip_http=0
	    skip_https=0
	    for previous_server in WWW API BOOT ; do
		if [ "$server" = "$previous_server" ] ; then
		    break
		fi
		previous_enabled=PLC_${previous_server}_ENABLED
		if [ "${!previous_enabled}" != "1" ] ; then
		    continue
		fi
		previous_http_port=PLC_${previous_server}_PORT
		previous_https_port=PLC_${previous_server}_SSL_PORT

		if [ -z "${http_port}" ]; then
                    skip_http=1;
                elif [ -z "${!http_port}" ]; then
                    skip_http=1;
                elif [ "${!http_port}" = "${!previous_http_port}" ] ; then
		    skip_http=1
		fi
		if [ -z "${https_port}" ]; then
                    skip_https=1
		elif [ -z "${!https_port}" ]; then
                    skip_https=1
                elif [ "${!https_port}" = "${!previous_https_port}" ] ; then
		    skip_https=1
		fi
	    done

	    # HTTP configuration
	    if [ $skip_http -eq 0 ] ; then
		cat <<EOF
Listen ${!http_port}
<VirtualHost *:${!http_port}>
    # Make sure that the admin web pages are always accessed via SSL
    Redirect /db https://$PLC_WWW_HOST:$PLC_WWW_SSL_PORT/db
    Redirect /planetlab https://$PLC_WWW_HOST:$PLC_WWW_SSL_PORT/planetlab
# as a matter of fact most xmlrpc clients won't follow the redirection
# so this is mostly rethorical, but just in case...
   Redirect /$plc_api_path_noslash https://$PLC_WWW_HOST:$PLC_WWW_SSL_PORT/$plc_api_path_noslash
</VirtualHost>

EOF
	    fi

	    # HTTPS configuration
	    if [ $skip_https -eq 0 ] ; then
		# XXX Cannot support NameVirtualHost over SSL. If
		# the API, boot, and web servers are all running
		# on the same machine, the web server certificate
		# takes precedence.
		sed -i \
		    -e "s/^Listen .*/Listen ${!https_port}/" \
		    -e "s/<VirtualHost _default_:.*>/<VirtualHost _default_:${!https_port}>/" \
		    $ssl_conf
		# this is used to locate the right certificates
		server_lower=$(echo $server | tr 'A-Z' 'a-z')

		# which one is used is currently configured in myplc.spec,
		# with mod_python preferred
		if rpm -q mod_python >& /dev/null ; then
		    configure_for_mod_python=true
		elif rpm -q mod_wsgi >& /dev/null || rpm -q python2-mod_wsgi >& /dev/null ; then
		    configure_for_mod_wsgi=true
		else
		    echo "Requires mod_python or mod_wsgi.... exiting"
		    exit 1
		fi

		# It would be tempting to use <IfModule> here
		# but early tests showed this could be tricky/fragile
		# So let's hard-wire it for one module
		# A lot of trial-and -error was involved in getting this that way...

		if [ -n "$configure_for_mod_python" ] ; then
#################### for mod_python
		    cat <<EOF
# mod_python location
<Location /PLCAPI/>
    SetHandler mod_python
    PythonPath "sys.path + ['/usr/share/plc_api']"
    PythonHandler apache.ModPython
</Location>
EOF

		elif [ -n "$configure_for_mod_wsgi" ] ; then
#################### for mod_wsgi
		    cat <<EOF
# create wsgi socket where we have the permission
WSGISocketPrefix run/wsgi

<VirtualHost *:${!https_port}>

   # SSL
   SSLEngine On
   SSLCertificateFile /etc/planetlab/${server_lower}_ssl.crt
   SSLCertificateKeyFile /etc/planetlab/${server_lower}_ssl.key
   SSLCertificateChainFile /etc/planetlab/${server_lower}_ca_ssl.crt

   WSGIScriptAlias /$plc_api_path_noslash /usr/share/plc_api/apache/plc.wsgi
# xxx would be cool to be able to tweak this through config
   WSGIDaemonProcess plcapi-wsgi-ssl user=apache group=apache processes=1 threads=25
   WSGIProcessGroup plcapi-wsgi-ssl

   <Directory "/usr/share/plc_api/apache">
      Options +ExecCGI
      $(apache_allow)
   </Directory>

</VirtualHost>
EOF
		fi
	    fi
	done >$plc_conf

	# Set custom Apache directives
	(
	    # could be restricted to boot boxes but harmless..
	    cat <<EOF
AddType application/octet-stream .iso
AddType application/octet-stream .usb
EOF
	    # make sure /PLCAPI can't get accessed if API not enabled here
	    if [ "$PLC_API_ENABLED" != "1" ] ; then
		cat <<EOF
# mod_wsgi location
<Location $PLC_API_PATH>
    $(apache_forbid)
</Location>
EOF
	    fi

	    # redirect www requests if not on the right server
	    if [ "$PLC_WWW_ENABLED" != "1" ] ; then
		cat <<EOF
Redirect /index.html http://$PLC_WWW_HOST:$PLC_WWW_PORT/
EOF
	    fi
	) >>$plc_conf

	# Make alpina-logs directory writable for bootmanager log upload
	chown apache:apache $DocumentRoot/alpina-logs/nodes

	# Make the Drupal files upload directory owned by Apache
	mkdir -p $DocumentRoot/files
	chown apache:apache $DocumentRoot/files

	# Symlink any (real) files or directories in
	# /data/var/www/html/* to /var/www/html/. We could descend
	# into subdirectories, but the code to do so properly would be
	# madness.
	for file in /data/$DocumentRoot/* ; do
	    if [ -e "$file" -a ! -h "$file" ] ; then
		base=$(basename "$file")
		if [ ! -e "$DocumentRoot/$base" ] ; then
		    ln -nsf "$file" "$DocumentRoot/$base"
		fi
	    fi
	done

	# Cleanup broken symlinks
	for file in $DocumentRoot/* ; do
	    if [ -h "$file" -a ! -e "$file" ] ; then
		rm -f "$file"
	    fi
	done

	# Old style PHP constants
	mkdir -p /etc/planetlab/php
	cat >/etc/planetlab/php/site_constants.php <<"EOF"
<?php
include('plc_config.php');

define('PL_API_SERVER', PLC_API_HOST);
define('PL_API_PATH', PLC_API_PATH);
define('PL_API_PORT', PLC_API_PORT);
define('PL_API_CAPABILITY_AUTH_METHOD', 'capability');
define('PL_API_CAPABILITY_PASS', PLC_API_MAINTENANCE_PASSWORD);
define('PL_API_CAPABILITY_USERNAME', PLC_API_MAINTENANCE_USER);
define('WWW_BASE', PLC_WWW_HOST);
define('BOOT_BASE', PLC_BOOT_HOST);
define('DEBUG', PLC_WWW_DEBUG);
define('API_CALL_DEBUG', PLC_API_DEBUG);
define('SENDMAIL', PLC_MAIL_ENABLED);
define('PLANETLAB_SUPPORT_EMAIL', PLC_NAME . ' Support <' . PLC_MAIL_SUPPORT_ADDRESS . '>');
define('PLANETLAB_SUPPORT_EMAIL_ONLY', PLC_MAIL_SUPPORT_ADDRESS);
?>
EOF

	## make room for logs
	touch /var/log/plcapi.log
	chmod 666 /var/log/plcapi.log

	plc_daemon httpd
	check

	result "$MESSAGE"
	;;

    stop)
	MESSAGE=$"Stopping web server"
	dialog "$MESSAGE"

	killproc plc_httpd
	check

	result "$MESSAGE"
	;;
esac

exit $ERRORS