#!/bin/sh

#  Licensed to the Apache Software Foundation (ASF) under one
#  or more contributor license agreements.  See the NOTICE file
#  distributed with this work for additional information
#  regarding copyright ownership.  The ASF licenses this file
#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
#  with the License.  You may obtain a copy of the License at
#  
#    http://www.apache.org/licenses/LICENSE-2.0
#    
#  Unless required by applicable law or agreed to in writing,
#  software distributed under the License is distributed on an
#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
#  KIND, either express or implied.  See the License for the
#  specific language governing permissions and limitations
#  under the License.

# Generate a minimal HTTPD configuration
here=`readlink -f $0`; here=`dirname $here`
root=`readlink -f $1`
host=$2
port=`echo $3 | awk -F "/" '{ print $1 }'`
pport=`echo $3 | awk -F "/" '{ print $2 }'`
if [ "$pport" = "" ]; then
    pport=$port
fi
htdocs=`readlink -f $4`
user=`id -un`
group=`id -gn`
modules_prefix=`cat $here/httpd-modules.prefix`
vhost=$5

mkdir -p $root
mkdir -p $root/logs
mkdir -p $root/conf
cat >$root/conf/httpd.conf <<EOF
# Apache HTTPD server configuration

# Set server name
ServerName http://$host:$pport
PidFile $root/logs/httpd.pid

# Minimal set of modules
LoadModule alias_module ${modules_prefix}/modules/mod_alias.so
LoadModule authn_file_module ${modules_prefix}/modules/mod_authn_file.so
LoadModule authn_default_module ${modules_prefix}/modules/mod_authn_default.so
LoadModule authz_host_module ${modules_prefix}/modules/mod_authz_host.so
LoadModule authz_groupfile_module ${modules_prefix}/modules/mod_authz_groupfile.so
LoadModule authz_user_module ${modules_prefix}/modules/mod_authz_user.so
LoadModule authz_default_module ${modules_prefix}/modules/mod_authz_default.so
LoadModule auth_basic_module ${modules_prefix}/modules/mod_auth_basic.so
LoadModule filter_module ${modules_prefix}/modules/mod_filter.so
LoadModule proxy_module ${modules_prefix}/modules/mod_proxy.so
LoadModule proxy_connect_module ${modules_prefix}/modules/mod_proxy_connect.so
LoadModule proxy_http_module ${modules_prefix}/modules/mod_proxy_http.so
LoadModule proxy_balancer_module ${modules_prefix}/modules/mod_proxy_balancer.so
LoadModule ssl_module ${modules_prefix}/modules/mod_ssl.so
LoadModule mime_module ${modules_prefix}/modules/mod_mime.so
LoadModule status_module ${modules_prefix}/modules/mod_status.so
LoadModule asis_module ${modules_prefix}/modules/mod_asis.so
LoadModule negotiation_module ${modules_prefix}/modules/mod_negotiation.so
LoadModule dir_module ${modules_prefix}/modules/mod_dir.so
LoadModule rewrite_module ${modules_prefix}/modules/mod_rewrite.so
LoadModule setenvif_module ${modules_prefix}/modules/mod_setenvif.so
<IfModule !log_config_module>
LoadModule log_config_module ${modules_prefix}/modules/mod_log_config.so
</IfModule>
LoadModule vhost_alias_module ${modules_prefix}/modules/mod_vhost_alias.so

# Basic security precautions
User $user
Group $group
ServerSignature Off
ServerTokens Prod
Timeout 45
LimitRequestBody 1048576
HostNameLookups Off

# Logging
ErrorLog $root/logs/error_log
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"" combined
CustomLog $root/logs/access_log combined
LogLevel warn

# Configure Mime types
DefaultType text/plain
TypesConfig $here/conf/mime.types

# Set document root
DocumentRoot $htdocs
DirectoryIndex index.html

# Protect server files
<Directory />
Options None
AllowOverride None
Order deny,allow  
Deny from all
</Directory>
<FilesMatch "^\.ht">
Order deny,allow
Deny from all
Satisfy Any
</FilesMatch>

# Allow access to document root
<Directory "$htdocs">
Options FollowSymLinks
Allow from all
</Directory>

# Allow access to service components
<Location />
Options FollowSymLinks
Allow from all
</Location>

# Setup HTTP virtual hosts
Listen $port

<VirtualHost *:$port>
ServerName http://$host:$pport
UseCanonicalName Off
</VirtualHost>

EOF

# Generate mass dynamic virtual hosting configuration
if [ "$vhost" = "vhost" ]; then

cat >>$root/conf/httpd.conf <<EOF
# Setup mass dynamic virtual hosting
NameVirtualHost *:$port

<VirtualHost *:$port>
ServerName http://vhost.$host:$pport
ServerAlias *.$host
UseCanonicalName Off
VirtualDocumentRoot $htdocs/domains/%1/
</VirtualHost>

# Isolate virtual host based requests
MaxRequestsPerChild 1

EOF

fi