#!/bin/bash
#################################################################
#    One-click CDN Installation Script v0.1.0                   #
#    Written by shc (https://qing.su)                           #
#    Github link: https://github.com/Har-Kuun/OneClickCDN       #
#    Contact me: https://t.me/hsun94   E-mail: hi@qing.su       #
#                                                               #
#    This script is distributed in the hope that it will be     #
#    useful, but ABSOLUTELY WITHOUT ANY WARRANTY.               #
#                                                               #
#    Thank you for using this script.                           #
#################################################################


#You can change the Traffic Server source file download link here.
#Check https://www.apache.org/dyn/closer.cgi/trafficserver for the latest stable version.

TS_DOWNLOAD_LINK="https://downloads.apache.org/trafficserver/trafficserver-8.1.5.tar.bz2"
TS_VERSION="8.1.5"



#You can enable an experimental feature: reverse proxy for any website.
#Please note that this feature is kind of buggy; you might have to manually modify some mapping rules if necessary.
#If you wish to turn on this feature, set the value for the variable below to ON, and use the special key in the main function to add reverse proxy instances.

REVERSE_PROXY_MODE_ENABLED=OFF



#By default, this script only works on Ubuntu 20, Debian 10/11, and CentOS 7/8.
#You can disable the OS check switch below and tweak the code yourself to try to install it in other OS versions.
#Please do note that if you choose to use this script on OS other than Ubuntu 20, Debian 10, or CentOS 7/8, you might mess up your OS.  Please keep a backup of your server before installation.

OS_CHECK_ENABLED=ON







#########################################################################
#    Functions start here.                                              #
#    Do not change anything below unless you know what you are doing.   #
#########################################################################

function check_OS
{
	if [ -f /etc/lsb-release ]
	then
		cat /etc/lsb-release | grep "DISTRIB_RELEASE=18." >/dev/null
		if [ $? = 0 ]
		then
			OS=UBUNTU18
			echo "Support of Ubuntu 18 is experimental.  You may get error in TLS handshakes."
			echo "Please consider upgrading to Ubuntu 20 (simply run \"do-release-upgrade -d\")."
			echo "Please tweak the OS_CHECK_ENABLED setting if you still wish to install on Ubuntu 18."
			echo 
			exit 1
		else
			cat /etc/lsb-release | grep "DISTRIB_RELEASE=20." >/dev/null
			if [ $? = 0 ]
			then
				OS=UBUNTU20
			else
				say "Sorry, this script only supports Ubuntu 20 and Debian 10/11." red
				echo 
				exit 1
			fi
		fi
	elif [ -f /etc/debian_version ] ; then
		cat /etc/debian_version | grep "^10." >/dev/null
		if [ $? = 0 ] ; then
			OS=DEBIAN10
			echo "Support of Debian 10 is experimental.  Please report bugs."
			echo 
		else
			cat /etc/debian_version | grep "^9." >/dev/null
			if [ $? = 0 ] ; then
				OS=DEBIAN9
				echo "Support of Debian 9 is experimental.  You may get error in TLS handshakes."
				echo "Please tweak the OS_CHECK_ENABLED setting if you still wish to install on Debian 9."
				echo 
				exit 1
			else
				cat /etc/debian_version | grep "^11." >/dev/null
				if [ $? = 0 ] ; then
					OS=DEBIAN11
					echo "Support of Debian 11 is experimental.  Please report bugs."
					echo 
				else
					say "Sorry, this script only supports Ubuntu 20 and Debian 10/11." red
					echo 
					exit 1
				fi
			fi
		fi
	elif [ -f /etc/redhat-release ] ; then
		cat /etc/redhat-release | grep " 8." >/dev/null
		if [ $? = 0 ] ; then
			OS=CENTOS8
			echo "Support of CentOS 8 is experimental.  Please report bugs."
			echo "Please try disabling selinux or firewalld if you cannot visit your website."
			echo 
		else
			cat /etc/redhat-release | grep " 7." >/dev/null
			if [ $? = 0 ] ; then
				OS=CENTOS7
				echo "Support of CentOS 7 is experimental.  Please report bugs."
				echo "Please try disabling selinux or firewalld if you cannot visit your website."
				echo 
			else
				echo "Sorry, this script only supports Ubuntu 20, Debian 10/11, and CentOS 7/8."
				echo
				exit 1
			fi
		fi
	else
		echo "Sorry, this script only supports Ubuntu 20, Debian 10/11, and CentOS 7/8."
		echo 
		exit 1
	fi
}

function check_TS
{
	if [ -f /usr/local/bin/trafficserver ] ; then
		TS_INSTALLED=1
	else
		TS_INSTALLED=0
	fi
}


function install_TS
{
	say @B"Starting Traffic Server installation..." green
	echo "..."
	echo "..."
	echo "Removing Nginx and Apache..."
	apt-get remove nginx apache -y
	echo "Installing depedencies..."
	apt-get update && apt-get upgrade -y
	apt-get install wget curl tar certbot automake libtool pkg-config libmodule-install-perl gcc g++ libssl-dev tcl-dev libpcre3-dev libcap-dev libhwloc-dev libncurses5-dev libcurl4-openssl-dev flex autotools-dev bison debhelper dh-apparmor gettext intltool-debian libbison-dev libexpat1-dev libfl-dev libsigsegv2 libsqlite3-dev m4 po-debconf tcl8.6-dev zlib1g-dev -y
	wget $TS_DOWNLOAD_LINK
	tar xjf trafficserver-${TS_VERSION}.tar.bz2
	rm -f trafficserver-${TS_VERSION}.tar.bz2
	cd ${current_dir}/trafficserver-${TS_VERSION}
	echo "Start building Traffic Server from source..."
	./configure --enable-experimental-plugins
	if [ -f ${current_dir}/trafficserver-${TS_VERSION}/config.status ] ; then
		say @B"Dependencies met!" green
		say @B"Compiling now..." green
		echo
	else
		echo 
		say "Missing dependencies." red
		echo "Please check log, install required dependencies, and run this script again."
		echo "Please also consider to report your log here https://github.com/Har-Kuun/OneClickCDN/issues so that I can fix this issue."
		echo "Thank you!"
		echo 
		exit 1
	fi
	make
	make install
	if [ -f /usr/local/bin/traffic_manager ] ; then
		echo 
		say @B"Traffic Server successfully installed!" green
		echo
	else
		echo
		say "Traffic Server installation failed." red
		echo "Please check the above log for reasons."
		echo "Please also consider to report your log here https://github.com/Har-Kuun/OneClickCDN/issues so that I can fix this issue."
		echo "Thank you!"
		echo
		exit 1
	fi
	ln -s /usr/local/etc/trafficserver /etc/trafficserver
	mkdir /etc/trafficserver/ssl
	chown nobody /etc/trafficserver/ssl
	chmod 0760 /etc/trafficserver/ssl
	cd ${current_dir}
	ldconfig
	trafficserver start
	echo 
	say @B"Traffic Server successfully started!" green
	echo "Domain		Type(CDN/RevProxy)		OriginIP" > /etc/trafficserver/hostsavailable.sun
#	echo "trafficserver start" >> /etc/rc.local
	run_on_startup
	echo 
}

function install_TS_CentOS
{
	say @B"Starting Traffic Server installation..." green
	echo "..."
	echo "..."
	echo "Removing Nginx and Apache..."
	yum remove httpd nginx -y
	echo "Installing depedencies..."
	yum update -y
	if [ "x$OS" = "xCENTOS7" ] ; then
		yum install centos-release-scl -y
		yum install devtoolset-8 -y
		scl enable devtoolset-8
		yum install wget curl tar openssl-devel pcre-devel tcl-devel gcc-c++ expat-devel libcap-devel hwloc ncurses-devel libcurl-devel pcre-devel tcl-devel expat-devel openssl-devel perl-ExtUtils-MakeMaker bzip2 -y
		yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm -y
		yum install certbot -y
		source /opt/rh/devtoolset-8/enable
	else
		dnf -y group install "Development Tools"
		dnf -y install wget curl tar openssl-devel pcre-devel tcl-devel expat-devel libcap-devel hwloc ncurses-devel bzip2 libcurl-devel pcre-devel tcl-devel expat-devel openssl-devel perl-ExtUtils-MakeMaker
		yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
		dnf -y install certbot
		dnf config-manager --set-enabled PowerTools		
	fi
	wget $TS_DOWNLOAD_LINK
	tar xjf trafficserver-${TS_VERSION}.tar.bz2
	rm -f trafficserver-${TS_VERSION}.tar.bz2
	cd ${current_dir}/trafficserver-${TS_VERSION}
	echo "Start building Traffic Server from source..."
	./configure --enable-experimental-plugins
	if [ -f ${current_dir}/trafficserver-${TS_VERSION}/config.status ] ; then
		say @B"Dependencies met!" green
		say @B"Compiling now..." green
		echo
	else
		echo 
		say "Missing dependencies." red
		echo "Please check log, install required dependencies, and run this script again."
		echo "Please also consider to report your log here https://github.com/Har-Kuun/OneClickCDN/issues so that I can fix this issue."
		echo "Thank you!"
		echo 
		exit 1
	fi
	make
	make install
	if [ -f /usr/local/bin/traffic_manager ] ; then
		echo 
		say @B"Traffic Server successfully installed!" green
		echo
	else
		echo
		say "Traffic Server installation failed." red
		echo "Please check the above log for reasons."
		echo "Please also consider to report your log here https://github.com/Har-Kuun/OneClickCDN/issues so that I can fix this issue."
		echo "Thank you!"
		echo
		exit 1
	fi
	ln -s /usr/local/etc/trafficserver /etc/trafficserver
	mkdir /etc/trafficserver/ssl
	chown nobody /etc/trafficserver/ssl
	chmod 0760 /etc/trafficserver/ssl
	cd ${current_dir}
	ldconfig
	/usr/local/bin/trafficserver start
	echo 
	say @B"Traffic Server successfully started!" green
	echo "Domain		Type(CDN/RevProxy)		OriginIP" > /etc/trafficserver/hostsavailable.sun
	run_on_startup
	echo 
}

function config_main_records
{
	cat > /etc/trafficserver/records.config <<END
CONFIG proxy.config.exec_thread.autoconfig INT 1
CONFIG proxy.config.exec_thread.autoconfig.scale FLOAT 1.5
CONFIG proxy.config.exec_thread.limit INT 2
CONFIG proxy.config.accept_threads INT 1
CONFIG proxy.config.task_threads INT 2
CONFIG proxy.config.cache.threads_per_disk INT 8
CONFIG proxy.config.exec_thread.affinity INT 1
CONFIG proxy.config.http.server_ports STRING 80 443:proto=http2;http:ssl
CONFIG proxy.config.http.insert_request_via_str INT 1
CONFIG proxy.config.http.insert_response_via_str INT 2
CONFIG proxy.config.http.response_via_str STRING ATS
CONFIG proxy.config.http.parent_proxy_routing_enable INT 0
CONFIG proxy.config.http.parent_proxy.retry_time INT 300
CONFIG proxy.config.http.parent_proxy.connect_attempts_timeout INT 30
CONFIG proxy.config.http.forward.proxy_auth_to_parent INT 0
CONFIG proxy.config.http.uncacheable_requests_bypass_parent INT 1
CONFIG proxy.config.http.keep_alive_no_activity_timeout_in INT 120
CONFIG proxy.config.http.keep_alive_no_activity_timeout_out INT 120
CONFIG proxy.config.http.transaction_no_activity_timeout_in INT 30
CONFIG proxy.config.http.transaction_no_activity_timeout_out INT 30
CONFIG proxy.config.http.transaction_active_timeout_in INT 900
CONFIG proxy.config.http.transaction_active_timeout_out INT 0
CONFIG proxy.config.http.accept_no_activity_timeout INT 120
CONFIG proxy.config.net.default_inactivity_timeout INT 86400
CONFIG proxy.config.http.connect_attempts_max_retries INT 3
CONFIG proxy.config.http.connect_attempts_max_retries_dead_server INT 1
CONFIG proxy.config.http.connect_attempts_rr_retries INT 3
CONFIG proxy.config.http.connect_attempts_timeout INT 30
CONFIG proxy.config.http.post_connect_attempts_timeout INT 1800
CONFIG proxy.config.http.down_server.cache_time INT 60
CONFIG proxy.config.http.down_server.abort_threshold INT 10
CONFIG proxy.config.http.negative_caching_enabled INT 0
CONFIG proxy.config.http.negative_caching_lifetime INT 1800
CONFIG proxy.config.http.insert_client_ip INT 1
CONFIG proxy.config.http.insert_squid_x_forwarded_for INT 1
CONFIG proxy.config.http.push_method_enabled INT 1
CONFIG proxy.config.http.cache.http INT 1
CONFIG proxy.config.http.cache.ignore_client_cc_max_age INT 1
CONFIG proxy.config.http.normalize_ae INT 1
CONFIG proxy.config.http.cache.cache_responses_to_cookies INT 1
CONFIG proxy.config.http.cache.when_to_revalidate INT 0
CONFIG proxy.config.http.cache.required_headers INT 2
CONFIG proxy.config.http.cache.ignore_client_no_cache INT 1
CONFIG proxy.config.http.cache.heuristic_min_lifetime INT 3600
CONFIG proxy.config.http.cache.heuristic_max_lifetime INT 86400
CONFIG proxy.config.http.cache.heuristic_lm_factor FLOAT 0.10
CONFIG proxy.config.net.connections_throttle INT 30000
CONFIG proxy.config.net.max_connections_in INT 30000
CONFIG proxy.config.net.max_connections_active_in INT 10000
CONFIG proxy.config.cache.ram_cache_cutoff INT 4194304
CONFIG proxy.config.cache.limits.http.max_alts INT 5
CONFIG proxy.config.cache.max_doc_size INT 0
CONFIG proxy.config.cache.min_average_object_size INT 8000
CONFIG proxy.config.log.logging_enabled INT 3
CONFIG proxy.config.log.max_space_mb_for_logs INT 25000
CONFIG proxy.config.log.max_space_mb_headroom INT 1000
CONFIG proxy.config.log.rolling_enabled INT 1
CONFIG proxy.config.log.rolling_interval_sec INT 86400
CONFIG proxy.config.log.rolling_size_mb INT 10
CONFIG proxy.config.log.auto_delete_rolled_files INT 1
CONFIG proxy.config.log.periodic_tasks_interval INT 5
CONFIG proxy.config.url_remap.remap_required INT 1
CONFIG proxy.config.url_remap.pristine_host_hdr INT 1
CONFIG proxy.config.reverse_proxy.enabled INT 1
CONFIG proxy.config.ssl.client.verify.server INT 0
CONFIG proxy.config.ssl.client.CA.cert.filename STRING NULL
CONFIG proxy.config.ssl.server.cipher_suite STRING ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-DSS-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
CONFIG proxy.config.diags.debug.enabled INT 0
CONFIG proxy.config.diags.debug.tags STRING http|dns
CONFIG proxy.config.dump_mem_info_frequency INT 0
CONFIG proxy.config.http.slow.log.threshold INT 0
CONFIG proxy.config.ssl.server.cert.path STRING /etc/trafficserver/ssl/
CONFIG proxy.config.ssl.server.private_key.path STRING /etc/trafficserver/ssl/
CONFIG proxy.config.cache.enable_read_while_writer INT 1
CONFIG proxy.config.http.background_fill_active_timeout INT 0
CONFIG proxy.config.http.background_fill_completed_threshold FLOAT 0.000000
CONFIG proxy.config.cache.max_doc_size INT 0
CONFIG proxy.config.cache.read_while_writer.max_retries INT 10
CONFIG proxy.config.cache.read_while_writer_retry.delay INT 50
CONFIG proxy.config.http.congestion_control.enabled INT 1
CONFIG proxy.config.http.cache.max_open_read_retries INT 5
CONFIG proxy.config.http.cache.open_read_retry_time INT 10
CONFIG proxy.config.cache.ram_cache.compress INT 1
CONFIG proxy.config.ssl.ocsp.enabled INT 1

END
}

function config_cache_rules
{
	cat > /etc/trafficserver/cache.config <<END
url_regex=.* suffix=xml  ttl-in-cache=5d
url_regex=.* suffix=ts  ttl-in-cache=5d
url_regex=.* suffix=jpeg  ttl-in-cache=5d
url_regex=.* suffix=mp4  ttl-in-cache=5d
url_regex=.* suffix=zip  ttl-in-cache=5d
url_regex=.* suffix=gif  ttl-in-cache=5d
url_regex=.* suffix=ppt  ttl-in-cache=5d
url_regex=.* suffix=jpg  ttl-in-cache=5d
url_regex=.* suffix=swf  ttl-in-cache=5d
url_regex=.* scheme=https ttl-in-cache=1h
url_regex=.* scheme=http  ttl-in-cache=1h
url_regex=.* suffix=m3u8  ttl-in-cache=5d
url_regex=.* suffix=js  ttl-in-cache=5d
url_regex=.* suffix=css  ttl-in-cache=5d
url_regex=.* suffix=html  ttl-in-cache=5d

END
}

function config_cache_storage
{
	valid_integer=0
	while [ ${valid_integer} != 1 ]
	do
		ram_cache_size=
		echo 
		echo "Please specify RAM cache size."
		echo "The unit is MB.  Please type an integer only."
		echo "The recommended value is 200 per GB of RAM on your server."
		echo 
		read ram_cache_size
		re='^[0-9]+$'
		if ! [[ ${ram_cache_size} =~ $re ]] ; then
			say @B"Please type an integer only." yellow
		else
			valid_integer=1
		fi
	done
	if [ $ram_cache_size -lt 50 ] ; then
                ram_cache_size=50
        fi
	echo 
	say @B"RAM cache size set to ${ram_cache_size}M." green
	echo 
	echo "CONFIG proxy.config.cache.ram_cache.size INT ${ram_cache_size}M" >> /etc/trafficserver/records.config

	valid_integer=0
	while [ ${valid_integer} != 1 ]
	do
		disk_cache_size=
		echo 
		echo "Please specify disk cache size."
		echo "The unit is MB.  Please type an integer only."
		echo "The recommended value is at least 2048."
		echo 
		read disk_cache_size
		if ! [[ ${disk_cache_size} =~ $re ]] ; then
			say @B"please type an integer only." yellow
		else
			valid_integer=1
		fi
	done
	if [ $disk_cache_size -gt 256 ] ; then
		echo 
		say @B"Disk cache size set to ${disk_cache_size}M." green
		echo 
		echo "var/trafficserver ${disk_cache_size}M" > /etc/trafficserver/storage.config
	else
		echo 
		say @B"Disk cache size set to 256M." green
		echo 
	fi
}

function config_cache_partitioning
{
	echo 
	echo "Performing disk cache partitioning..."
	for i in 1 2 3 4
	do
		echo "volume=${i} scheme=http size=25%" >> /etc/trafficserver/volume.config
	done
	echo "hostname=* volume=1,2,3,4" > /etc/trafficserver/hosting.config
	say @B"Disk cache partitioned." green
	echo 
}

function config_cache_dynamic_content
{
	echo
	echo "CONFIG proxy.config.http.cache.cache_urls_that_look_dynamic INT 1" >> /etc/trafficserver/records.config
	say @B"Cache rules updated!" green
	say @B"Traffic Server will cache dynamic content." green
	echo 
}

function config_mapping_reverse_proxy
{
	proxy_hostname=$1
	origin_hostname=$2
	origin_scheme=$3
	echo 
	echo "Adding mapping rules for ${proxy_hostname} as a reverse proxy of ${origin_hostname}..."
	echo "redirect http://${proxy_hostname}/ https://${proxy_hostname}/" >> /etc/trafficserver/remap.config
	echo "map https://${proxy_hostname}/ ${origin_scheme}://${origin_hostname}/" >> /etc/trafficserver/remap.config
	echo "reverse_map ${origin_scheme}://${origin_hostname}/ https://${proxy_hostname}/" >> /etc/trafficserver/remap.config
	say @B"3 rules added." green
	echo 
}

function config_mapping_cdn
{
	cdn_hostname=$1
	origin_ip=$2
	origin_scheme=$3
	origin_port=$4
	echo 
	echo "Adding mapping rules for ${cdn_hostname}..."
	if [ "$origin_scheme" = "https" ] ; then
		echo "redirect http://${cdn_hostname}/ https://${cdn_hostname}/" >> /etc/trafficserver/remap.config
		echo "map https://${cdn_hostname}/ ${origin_scheme}://${origin_ip}:${origin_port}/" >> /etc/trafficserver/remap.config
	else
		echo "map http://${cdn_hostname}/ ${origin_scheme}://${origin_ip}:${origin_port}/" >> /etc/trafficserver/remap.config
	fi
	say @B"2 rules added." green
	echo 
}

function add_reverse_proxy
{
	echo 
	echo "Please specify your proxy domain name (e.g., proxy.example.com):"
	read proxy_hostname_add
	echo "Please specify the origin website domain name (e.g., origin.example.com):"
	read origin_hostname_add
	echo "Please specify the origin website IP address (e.g., 88.88.88.88).  If it has multiple IPs, any would work:"
	read origin_ip_add
	echo "Is the origin website using HTTPS or HTTP?  Type 1 for HTTPS, or 2 for HTTP.  If both works, then either is fine:"
	read isHTTPS
	if [ $isHTTPS = 1 ] ; then
		config_mapping_reverse_proxy $proxy_hostname_add $origin_hostname_add https
	else
		config_mapping_reverse_proxy $proxy_hostname_add $origin_hostname_add http
	fi
	echo "${proxy_hostname_add}		RevProxy		${origin_hostname_add}" >> /etc/trafficserver/hostsavailable.sun
	echo "Would you like to configure SSL certificates for domain name ${proxy_hostname_add} now?"
	echo "We can set up SSL with your own certificates, or can issue a free Let's Encrypt SSL certificate for you, if you have already pointed your domain to this server."
	echo "How would you like to proceed?"
	echo "1: I know the absolute path to my certificate files (private key, certificate, CA chain (optional))."
	echo "2: I have pointed my domain name to this server, and I want a free Let's Encrypt certificate."
	echo "3: I forgot the path to my certificate files, so I need to go back to SSH and find them; or I do not need SSL certificate for this domain."
	echo "Please select 1, 2, or 3:"
	read choice_ssl
	case $choice_ssl in 
		1 ) 	config_ssl_non_le $proxy_hostname_add $origin_ip_add
				;;
		2 ) 	config_ssl_le $proxy_hostname_add $origin_ip_add
				;;
		3 ) 	config_ssl_later
				;;
		* )		echo "Error!" 
				exit 1
				;;
	esac
}

function add_cdn
{
	echo 
	echo "Please specify your website domain name (e.g., example.com):"
	read cdn_hostname_add
	echo "Please specify the origin website IP address (e.g., 88.88.88.88).  If it has multiple IPs, any would work:"
	read origin_ip_add
	echo "Is the origin website using HTTPS or HTTP?  Type 1 for HTTPS, or 2 for HTTP.  If both works, then either is fine:"
	read isHTTPS
	if [ $isHTTPS = 1 ] ; then
		cdn_port=443
		config_mapping_cdn $cdn_hostname_add $origin_ip_add https 443
	else
		cdn_port=80
		config_mapping_cdn $cdn_hostname_add $origin_ip_add http 80
	fi
	echo 
	echo "${cdn_hostname_add}		CDN		${origin_ip_add}:${cdn_port}" >> /etc/trafficserver/hostsavailable.sun
	echo "Would you like to configure SSL certificates for domain name ${cdn_hostname_add} now?"
	echo 
	echo "We can set up SSL with your own certificates, or can issue a free Let's Encrypt SSL certificate for you, if you have already pointed your domain to this server."
	echo "How would you like to proceed?"
	echo 
	echo "1: I know the absolute path to my certificate files (private key, certificate, CA chain (optional))."
	echo "2: I have pointed my domain name to this server, and I want a free Let's Encrypt certificate."
	echo "3: I forgot the path to my certificate files, so I need to go back to SSH and find them; or I do not need SSL certificate for this domain."
	echo "Please select 1, 2, or 3:"
	read choice_ssl
	case $choice_ssl in 
		1 ) 	config_ssl_non_le $cdn_hostname_add $origin_ip_add
				;;
		2 ) 	config_ssl_le $cdn_hostname_add $origin_ip_add
				;;
		3 ) 	config_ssl_later
				;;
		* )		say "Error!" red
				exit 1
				;;
	esac
}

function config_ssl_selection
{
	# this function is only called from menu option 4.
	echo "We can set up SSL with your own certificates, or can issue a free Let's Encrypt SSL certificate for you, if you have already pointed your domain to this server."
	echo "How would you like to proceed?"
	echo 
	echo "1: I know the absolute path to my certificate files (private key, certificate, CA chain (optional))."
	echo "2: I have pointed my domain name to this server, and I want a free Let's Encrypt certificate."
	echo "3: I forgot the path to my certificate files, so I need to go back to SSH and find them; or I do not need SSL certificate for this domain."
	echo "Please select 1, 2, or 3:"
	read choice_ssl
	if [ $choice_ssl = 3 ] ; then
		config_ssl_later
	else
		echo 
		echo "Please specify your domain name (e.g., qing.su): "
		read ssl_hostname_add
		echo "Please specify the origin server IP address (e.g., 88.88.88.88): "
		read ssl_ip_add
		case $choice_ssl in 
			1 ) 	config_ssl_non_le $ssl_hostname_add $ssl_ip_add
					;;
			2 ) 	config_ssl_le $ssl_hostname_add $ssl_ip_add
					;;
			3 ) 	config_ssl_later
					;;
			* )		say "Error!" red 
					exit 1
					;;
		esac
	fi
}

function config_ssl_later
{
	echo 
	echo "No problem!  Please take your time and find your certificates."
	echo "You can always run this script again and set up SSL certificates for your instances later."
	echo "Simply choose Option 4 in the main menu."
	/usr/local/bin/trafficserver restart
	echo "Thank you for using this script!  Have a nice day!"
	exit 0
}
	
function display_license
{
	echo 
	echo '*******************************************************************'
	echo '*       One-click CDN installation script                         *'
	echo '*       Version 0.1.0                                             *'
	echo '*       Author: shc (Har-Kuun) https://qing.su                    *'
	echo '*       https://github.com/Har-Kuun/OneClickCDN                   *'
	echo '*       Thank you for using this script.  E-mail: hi@qing.su      *'
	echo '*******************************************************************'
}

function config_ssl_non_le
{
	echo 
	echo "Please specify your private key file location (e.g., /etc/certs/qing.su.key): "
	read priv_key_file
	echo "Please specify your certificate file location (e.g., /etc/certs/qing.su.crt): "
	read cert_file
	echo "Is your certificate chained? (i.e., are CA-certficates already included in your certificate file?) [Y/N]:"
	read is_chained
	if [ "x${is_chained}" != "xY" ] && [ "x${is_chained}" != "xy" ]
	then
		echo "Please specify your CA-certificates file location (e.g., /etc/certs/qing.su.ca-bundle): "
		read ca_cert_file
	fi
	# $1 is hostname and $2 is IP
	echo "Configuring SSL certificates for $2..."
	cp $priv_key_file /etc/trafficserver/ssl/$1.key
	cp $cert_file /etc/trafficserver/ssl/$1.crt
	if [ -f /etc/trafficserver/ssl/$1.crt ] && [ -f /etc/trafficserver/ssl/$1.key ] ; then
		if [ "x${is_chained}" = "xY" ] || [ "x${is_chained}" = "xy" ] ; then
			echo "dest_ip=$2 ssl_cert_name=$1.crt ssl_key_name=$1.key" >> /etc/trafficserver/ssl_multicert.config
		else
			cp $ca_cert_file /etc/trafficserver/ssl/$1.ca.crt
			echo "dest_ip=$2 ssl_cert_name=$1.crt ssl_key_name=$1.key ssl_ca_name=$1.ca.crt" >> /etc/trafficserver/ssl_multicert.config
		fi
		say @B"SSL certificates successfully configured." green
		echo "Origin IP: $2"
		echo "Private key file: /etc/trafficserver/ssl/$1.key"
		echo "Certificate file: /etc/trafficserver/ssl/$1.crt"
		if [ "x${is_chained}" != "xY" ] ; then
			echo "Intermediate certificate: /etc/trafficserver/ssl/$1.ca.crt"
		fi
		echo 
	else
		say "SSL configuration failed!" red
		echo "Please check the above log."
		echo 
		exit 1
	fi
	chown -R nobody /etc/trafficserver/ssl/
	chmod -R 0760 /etc/trafficserver/ssl/
	echo 
}

function config_ssl_le
{
	origin_ip=$2
	hostname_le=$1
	echo 
	echo "Starting to issue free certificate from Let's Encrypt..."
	echo "Please keep in mind that this feature is experimental..."
	echo 
	echo "Stopping trafficserver..."
	echo "Please input your e-mail address: "
	read email_le
	/usr/local/bin/trafficserver stop
	systemctl stop trafficserver
	certbot certonly --standalone --agree-tos --email $email_le -d $hostname_le
	cp /etc/letsencrypt/live/${hostname_le}/fullchain.pem /etc/trafficserver/ssl/${hostname_le}.crt
	cp /etc/letsencrypt/live/${hostname_le}/privkey.pem /etc/trafficserver/ssl/${hostname_le}.key
	if [ -f /etc/trafficserver/ssl/${hostname_le}.key ] ; then
		echo "dest_ip=${origin_ip} ssl_cert_name=${hostname_le}.crt ssl_key_name=${hostname_le}.key" >> /etc/trafficserver/ssl_multicert.config
		say @B"SSL certificates successfully configured." green
		echo "Origin IP: ${origin_ip}"
		echo "Private key file: /etc/trafficserver/ssl/${hostname_le}.key"
		echo "Certificate file: /etc/trafficserver/ssl/${hostname_le}.crt"
		echo 
	else
		say "Let's Encrypt SSL configuration failed!" red
		echo "Please check the above log."
		echo
		exit 1
	fi
	chown -R nobody /etc/trafficserver/ssl/
	chmod -R 0760 /etc/trafficserver/ssl/
	systemctl start trafficserver
	/usr/local/bin/trafficserver start
	echo 
}

function display_config_locations
{
	echo 
	echo "General configurations: /etc/trafficserver/records.config"
	echo "SSL: /etc/trafficserver/ssl_multicert.config"
	echo "Mapping rules: /etc/trafficserver/remap.config"
	echo "Cache rules: /etc/trafficserver/cache.config"
	echo "Disk cache size: /etc/trafficserver/storage.config"
	echo 
	echo "Log files location: /usr/local/var/log/trafficserver"
	echo 
	echo "For other configurations, check the official wiki:"
	echo "https://docs.trafficserver.apache.org/en/latest/admin-guide/files/records.config.en.html#configuration-variables"
	echo 
	echo "Do not forget to restart Traffic Server after modifying config files."
	echo "Simply run: \"trafficserver restart\""
	echo "Thank you.  Press return key to continue."
	read catch_all_variable
	echo 
}

function view_stats
{
	cat /etc/trafficserver/hostsavailable.sun
	echo 
	echo "Please specify the website that you would like to check stats."
	echo "Note: type in the Origin IP:Port of the origin website."
	echo "For example, 88.88.88.88:443."
	echo "Please specify:"
	read view_stats_host
	traffic_logstats -o $view_stats_host
	echo 
}

function display_useful_commands
{
	echo 
	echo "View Traffic Server stats: traffic_top"
	echo "Start/stop/restart Traffic Server: trafficserver start/stop/restart"
	echo "Check whether Traffic Server is running: trafficserver status"
	echo "Decode via header: traffic_via '[xXxXxX]'"
	echo "Reload Traffic Server config files: traffic_ctl config reload"
	echo 
	echo "You can always run this script again to add a CDN website, configure SSL certificates, check stats, etc."
	echo 
	echo "Press return key to continue."
	read catch_all_variable
}

function enable_header_rewriter
{
	echo
	echo "Setting up header rewriter..."
	echo "header_rewrite.so /etc/trafficserver/header_rewrite.config" > /etc/trafficserver/plugin.config
	touch /etc/trafficserver/header_rewrite.config
	say @B"Header rewriter plugin enabled!" green
	echo 
}

function enable_CORS
{
	echo
	echo "Setting up cross-origin resource sharing headers..."
	echo "rm-header Access-Control-Allow-Origin *" >> /etc/trafficserver/header_rewrite.config
	echo "add-header Access-Control-Allow-Origin *" >> /etc/trafficserver/header_rewrite.config
	say @B"CORS header added!" green
	echo 
}

function customize_server_header
{
	echo 
	echo "How would you like your server to be called?"
	read cdn_server_header
	echo "OK.  Setting server header now..."
	echo "cond %\{SEND_RESPONSE_HDR_HOOK\} [AND]" >> /etc/trafficserver/header_rewrite.config
	echo "cond %{HEADER:server} =ATS/${TS_VERSION}" >> /etc/trafficserver/header_rewrite.config
	echo "set-header server \"${cdn_server_header}\"" >> /etc/trafficserver/header_rewrite.config
	say @B"Server header set!" green
	echo 
}

function clear_all_cache
{
	echo 
	echo "Stopping Traffic Server..."
	/usr/local/bin/trafficserver stop
	echo "Purging all cache..."
	traffic_server -Cclear
	say @B"Cache purged successfully." green
	echo "Starting Traffic Server..."
	/usr/local/bin/trafficserver start
	echo 
}

function purge_single_object
{
	echo 
	echo "Please input the URL to the object that you'd like to purge from cache."
	say @B"Please INCLUDE \"http://\" or \"https://\"." yellow
	echo 
	read purge_object_url
	read purge_object_domain_name <<< $(echo "$purge_object_url" | awk -F/ '{print $3}')
	read purge_object_domain_name_protocol <<< $(echo "$purge_object_url" | awk -F: '{print $1}')
	echo 
	cat /etc/trafficserver/hostsavailable.sun | grep $purge_object_domain_name >/dev/null
	if [ $? = 0 ] ; then
		if [ "x$purge_object_domain_name_protocol" = "xhttp" ] ; then
			purge_object_result=$(curl -vX PURGE --resolve ${purge_object_domain_name}:80:127.0.0.1 ${purge_object_url} 2>&1 | grep " 200")
		else
			purge_object_result=$(curl -vX PURGE --resolve ${purge_object_domain_name}:443:127.0.0.1 ${purge_object_url} 2>&1 | grep " 200")
		fi
		if [ -n "$purge_object_result" ] ; then
			say @B"Object ${purge_object_url} successfully purged from cache!" green
		else
			say "Purging ${purge_object_url} failed." red
			say "Object not exist or already purged from cache." red
		fi
	else
		say "Error!" red
		say "Domain name $purge_object_domain_name does not exist on this server." red
	fi
	echo "Press enter to return to the main menu."
	read catch_all_variable
	echo 
}

function purge_list_of_objects
{
	echo 
	echo "You are about to purge a list of objects from cache."
	say @B"Please specify the absolute path to the file containing the URL of objects." yellow
	echo "One URL per line. Please include \"http://\" or \"https://\"."
	read purge_object_list_file
	echo 
	if [ -f $purge_object_list_file ] ; then
		purge_object_list_result_file="${purge_object_list_file}_result"
		printf "%-10s   %-12s   %s\n" "Type" "Status" "URL" > $purge_object_list_result_file
		while read line; do 
			if [ "x$line" = "x" ] ; then
				continue
			fi		
			read purge_object_domain_name <<< $(echo "$line" | awk -F/ '{print $3}')
			read purge_object_domain_name_protocol <<< $(echo "$line" | awk -F: '{print $1}')
			cat /etc/trafficserver/hostsavailable.sun | grep $purge_object_domain_name >/dev/null
			if [ $? = 0 ] ; then
				if [ "x$purge_object_domain_name_protocol" = "xhttp" ] ; then
					purge_object_result=$(curl -vX PURGE --resolve ${purge_object_domain_name}:80:127.0.0.1 ${line} 2>&1 | grep " 200")
				else
					purge_object_result=$(curl -vX PURGE --resolve ${purge_object_domain_name}:443:127.0.0.1 ${line} 2>&1 | grep " 200")
				fi
				if [ -n "$purge_object_result" ] ; then
					say @B"PURGE        SUCCESS        ${line}" green
					say @B"PURGE        SUCCESS        ${line}" green >> $purge_object_list_result_file
				else
					say "PURGE        FAILURE        ${line}" red
					say "PURGE        FAILURE        ${line}" red >> $purge_object_list_result_file
				fi
			else
				say "PURGE        WRONG DOMAIN   ${line}" red
				say "PURGE        WRONG DOMAIN   ${line}" red >> $purge_object_list_result_file
			fi
		done < $purge_object_list_file
		say @B"Completed!" green
		say @B"Purging results have been saved to ${purge_object_list_result_file}." green
		say @B"You can use \"cat ${purge_object_list_result_file}\" to display the result file." green
	else
		say "The file you specified does not exist." red
		say "Please check." red
	fi
	echo "Press enter to return to the main menu."
	read catch_all_variable
	echo 
}
	
function push_single_object
{
	echo 
	echo "Please input the URL to the object that you'd like to push into cache."
	say @B"Please INCLUDE \"http://\" or \"https://\"." yellow
	echo 
	read push_object_url
	read push_object_domain_name <<< $(echo "$push_object_url" | awk -F/ '{print $3}')
	echo 
	cat /etc/trafficserver/hostsavailable.sun | grep $push_object_domain_name >/dev/null
	if [ $? = 0 ] ; then
		curl -s -i -o temp "$push_object_url"
		cat temp | grep " 200" >/dev/null
		if [ $? = 0 ] ; then
			curl -s -o /dev/null -X PUSH --data-binary temp "$push_object_url"
			say @B"Object $push_object_url successfully pushed into cache!" green
			rm -f temp
		else
			say "Pushing $push_object_url failed." red
			say @B"The requested URL cannot be fetched from the Origin server." red
			rm -f temp
		fi
	else
		say "Error!" red
		say "Domain name $push_object_domain_name does not exist on this server." red
	fi
	echo "Press enter to return to the main menu."
	read catch_all_variable
	echo 
}

function push_list_of_objects
{
	echo 
	echo "You are about to push a list of objects into cache."
	say @B"Please specify the absolute path to the file containing the URL of objects." yellow
	echo "One URL per line. Please include \"http://\" or \"https://\"."
	read push_object_list_file
	echo 
	if [ -f $push_object_list_file ] ; then
		push_object_list_result_file="${push_object_list_file}_result"
		printf "%-10s  %-12s   %s\n" "Type" "Status" "URL" > $push_object_list_result_file
		while read line; do 
			if [ "x$line" = "x" ] ; then
				continue
			fi
			read push_object_domain_name <<< $(echo "$line" | awk -F/ '{print $3}')
			cat /etc/trafficserver/hostsavailable.sun | grep $push_object_domain_name >/dev/null
			if [ $? = 0 ] ; then
				curl -s -i -o temp "$line"
				cat temp | grep " 200" >/dev/null
				if [ $? = 0 ] ; then
					curl -s -o /dev/null -X PUSH --data-binary temp "$line"
					say @B"PUSH        SUCCESS        ${line}" green
					say @B"PUSH        SUCCESS        ${line}" green >> $push_object_list_result_file
					rm -f temp
				else
					say "PUSH        FAILURE        ${line}" red
					say "PUSH        FAILURE        ${line}" red >> $push_object_list_result_file
					rm -f temp
				fi
			else
				say "PUSH        WRONG DOMAIN   ${line}" red
				say "PUSH        WRONG DOMAIN   ${line}" red >> $push_object_list_result_file
			fi
		done < $push_object_list_file
		say @B"Completed!" green
		say @B"Pushing results have been saved to ${push_object_list_result_file}." green
		say @B"You can use \"cat ${push_object_list_result_file}\" to display the result file." green
	else
		say "The file you specified does not exist." red
		say "Please check." red
	fi
	echo "Press enter to return to the main menu."
	read catch_all_variable
	echo 
}

function advanced_cache_control
{
	echo 
	echo "This submenu allows you to add/remove objects to/from cache."
	while [ $key != 0 ] ; do
		echo 
		say @B"Advanced cache control." cyan
		echo "1 - Purge all cache."
		echo "2 - Remove a single object from cache."
		echo "3 - Remove a list of objects from cache."
#		echo "4 - Push a single object into cache. (experimental)"
#		echo "5 - Push a list of objects into cache. (experimental)"
		echo "0 - Return to main menu."
		echo "Please select 1/2/3/4/5/0: "
		read cache_menu_key
		case $cache_menu_key in 
			1 ) 		clear_all_cache
						;;
			2 ) 		purge_single_object
						;;
			3 )			purge_list_of_objects
						;;
			4 ) 		push_single_object
						;;
			5 ) 		push_list_of_objects
						;;
			0 ) 		break
						;;
		esac
	done
	echo 
}

function change_cdn_ip
{
	echo
	echo "Please tell me your old Origin server IP.  No domain name required."
	read old_ip
	echo "OK.  Then tell me your new Origin server IP.  No domain name required."
	read new_ip
	sed -i "s/$old_ip/$new_ip/g" /etc/trafficserver/hostsavailable.sun
	sed -i "s/$old_ip/$new_ip/g" /etc/trafficserver/ssl_multicert.config
	sed -i "s/$old_ip/$new_ip/g" /etc/trafficserver/remap.config
	say @B"IP changed from ${old_ip} to ${new_ip}" green
	echo 
}

function reconfigure_traffic_server
{
	echo 
	echo "Are you sure to reconfigure Traffic Server?"
	echo "All previous configurations will be cleared."
	echo "Mapping rules and SSL certificate settings will be kept."
	say "Would you like to continue? [Y/N]" yellow blue
	read do_reconfigure_ts
	if [ "x$do_reconfigure_ts" = "xY" ] ; then
		echo 
		echo "Configuring Traffic Server..."
		config_main_records
		echo 
		echo "Would you like to configure cache rules automatically? [Y/N]"
		read do_config_cache_rules
		if [ "x$do_config_cache_rules" = "xY" ] || [ "x$do_config_cache_rules" = "xy" ] ; then
			echo "Configuring cache rules..."
			config_cache_rules
			say @B"Cache rules configured successfully." green
		else
			echo "You can configure cache rules manually at /etc/trafficserver/cache.config.  Make sure to run \"trafficserver restart\" after changing the cache rules."
		fi
		echo 
		echo "Configuring cache size..."
		config_cache_storage
		rm -f /etc/trafficserver/volume.config
		config_cache_partitioning
		rm -f /etc/trafficserver/header_rewrite.config
		enable_header_rewriter
		echo "Would you like Traffic Server to cache dynamic content? [Y/N]"
		read do_cache_dynamic_content
		if [ "x$do_cache_dynamic_content" = "xY" ] || [ "x$do_cache_dynamic_content" = "xy" ] ; then
			echo "Updating cache rules..."
			config_cache_dynamic_content
		else
			say @B"Traffic Server will not cache dynamic content!" yellow
			echo 
		fi
		echo "Would you like to enable \"Access-Control-Allow-Origin\" header (CORS)?"
		echo "Please choose Y if you have no idea what it is. [Y/N]"
		read do_enable_CORS
		if [ "x$do_enable_CORS" = "xY" ] || [ "x$do_enable_CORS" = "xy" ] ; then
			enable_CORS
		else
			say @B"CORS not configured." yellow
			echo 
		fi
		echo "The \"server\" header can be a short phrase, like \"shc-cdn-server 1.0.0\", or \"Traffic Server 8.0.8\"."
		echo "If you do not change it, the default value is \"ATS/${TS_VERSION}\""
		echo "Would you like to change it? [Y/N]"
		read do_change_server_header
		if [ "x$do_change_server_header" = "xY" ] || [ "x$do_change_server_header" = "xy" ] ; then
			customize_server_header
		else
			say @B"Server header tag value not changed." yellow
			echo 
		fi
		say @B"Configuration successfully finished!" green
		echo 
	else
		echo 
		say @B"Traffic Server not reconfigured." yellow
		echo 
	fi
}

function renew_le_certificate
{
	echo 
	echo "What is the domain name that you wish to renew Let's Encrypt certificate?"
	read renew_le_domain
	echo "OK.  Stopping Traffic Server..."
	/usr/local/bin/trafficserver stop
	systemctl stop trafficserver
	echo 
	echo "Renewing SSL certificate for ${renew_le_domain}..."
	echo 
	certbot certonly --standalone --agree-tos -d $renew_le_domain
	cp -f /etc/letsencrypt/live/${renew_le_domain}/fullchain.pem /etc/trafficserver/ssl/${renew_le_domain}.crt
	cp -f /etc/letsencrypt/live/${renew_le_domain}/privkey.pem /etc/trafficserver/ssl/${renew_le_domain}.key
	chown -R nobody /etc/trafficserver/ssl/
	chmod -R 0760 /etc/trafficserver/ssl/
	say @B"SSL certificate for ${renew_le_domain} successfully renewed." green
	echo 
	echo "Starting Traffic Server..."
	systemctl start trafficserver
	/usr/local/bin/trafficserver start
	echo 
}

function remove_cdn_website
{
	echo
	cat /etc/trafficserver/hostsavailable.sun
	echo
	echo "Please specify the domain name of the website that you would like to remove."
	echo "Do NOT include \"http\" or \"https\"."
	echo 
	read website_to_be_deleted
	echo 
	echo "You are about to delete website ${website_to_be_deleted} from this CDN server."
	echo "Please note that all configurations, as well as SSL certificate files associated with this domain name will be removed."
	say "Are you sure to continue? [Y/N]" yellow blue
	read ready_to_be_deleted
	if [ "x$ready_to_be_deleted" = "xY" ] || [ "x$ready_to_be_deleted" = "xy" ] ; then
		echo 
		echo "Removing website from server..."
		delete_line_in_file $website_to_be_deleted /etc/trafficserver/hostsavailable.sun
		delete_line_in_file $website_to_be_deleted /etc/trafficserver/remap.config
		delete_line_in_file $website_to_be_deleted /etc/trafficserver/ssl_multicert.config
		rm -f /etc/trafficserver/ssl/${website_to_be_deleted}.key
		rm -f /etc/trafficserver/ssl/${website_to_be_deleted}.crt
		if [ -f /etc/trafficserver/ssl/${website_to_be_deleted}.ca.crt ] ; then
			rm -f /etc/trafficserver/ssl/${website_to_be_deleted}.ca.crt
		fi
		echo 
		say @B"Website removed!" green
		echo "Restarting Traffic Server..."
		echo 
		/usr/local/bin/trafficserver restart
		echo 
	else
		echo 
		say @B"Website not removed!" yellow
		echo 
	fi
}

function say_goodbye
{
	echo 
	if [ $restart_switch = 1 ] ; then
		echo "Restarting Traffic Server now..."
		/usr/local/bin/trafficserver restart
	fi
	echo 
	echo "Thank you for using this script written by https://qing.su"
	echo "You can always run this script again to add a CDN website, configure SSL certificates, list current websites, check stats, etc."
	echo 
	echo "Bye!  Have a nice day."
	echo 
	key=0
}

function say
{
#This function is a colored version of the built-in "echo."
#https://github.com/Har-Kuun/useful-shell-functions/blob/master/colored-echo.sh
	echo_content=$1
	case $2 in
		black | k ) colorf=0 ;;
		red | r ) colorf=1 ;;
		green | g ) colorf=2 ;;
		yellow | y ) colorf=3 ;;
		blue | b ) colorf=4 ;;
		magenta | m ) colorf=5 ;;
		cyan | c ) colorf=6 ;;
		white | w ) colorf=7 ;;
		* ) colorf=N ;;
	esac
	case $3 in
		black | k ) colorb=0 ;;
		red | r ) colorb=1 ;;
		green | g ) colorb=2 ;;
		yellow | y ) colorb=3 ;;
		blue | b ) colorb=4 ;;
		magenta | m ) colorb=5 ;;
		cyan | c ) colorb=6 ;;
		white | w ) colorb=7 ;;
		* ) colorb=N ;;
	esac
	if [ "x${colorf}" != "xN" ] ; then
		tput setaf $colorf
	fi
	if [ "x${colorb}" != "xN" ] ; then
		tput setab $colorb
	fi
	printf "${echo_content}" | sed -e "s/@B/$(tput bold)/g"
	tput sgr 0
	printf "\n"
}

function delete_line_in_file
{
	delete_pattern=$1
	delete_file=$2
	grep -v $delete_pattern $delete_file > temp
	mv temp $delete_file
}

function run_on_startup
{
	cat > /etc/systemd/system/trafficserver.service <<END

[Unit]
Description=Apache Traffic Server
After=network.service systemd-networkd.service network-online.target dnsmasq.service

[Service]
Type=simple
ExecStart=/usr/local/bin/traffic_manager
ExecReload=/usr/local/bin/traffic_ctl config reload
Restart=always
RestartSec=1

[Install]
WantedBy=multi-user.target

END
	
	chmod 644 /etc/systemd/system/trafficserver.service
	systemctl daemon-reload
	systemctl enable trafficserver.service
}

function backupConfiguration
{
	echo 
	say @B"Backing up Trafficserver configurations..." yellow
	BackupFileName=OneClickCDN$(date +"%Y%m%d").tar.gz
	tar zcf $CurrentDir/$BackupFileName /usr/local/etc/trafficserver
	sleep 1
	cd /tmp && tar zxf $CurrentDir/$BackupFileName
	if [ -f /tmp/usr/local/etc/trafficserver/records.config ] ; then
		say @B"Configuration successfully backed up at $CurrentDir/$BackupFileName" green
		echo 
	else
		say "Backup failed.  Please try again." red
		echo 
	fi
}

function restoreBackup_localFile
{
	echo 
	say @B"Please input path to your Trafficserver configuration backup file, ending in .tar.gz" yellow
	read backupFilePath
	if [ -f $backupFilePath ] ; then
		echo 
		say @B"Restoring backup..." green
		tar zcf $CurrentDir/OneClickCDN$(date +"%Y%m%d").tar.gz /usr/local/etc/trafficserver
		cd /tmp && tar zxf $backupFilePath
		cd /usr/local/etc/trafficserver && rm -fr *
		cp -rf /tmp/usr/local/etc/trafficserver/* .
		sleep 2
		if [ -f /usr/local/etc/trafficserver/records.config ] ; then
			say @B"Configuration successfully restored from backup file." green
			chown -R nobody /etc/trafficserver/ssl/
			chmod -R 0760 /etc/trafficserver/ssl/
			/usr/local/bin/trafficserver restart
			echo 
		else
			say "Failed to restore configuration file from backup.  Please try again." red
			echo 
		fi
	else
		say "Cannot find Trafficserver configuration backup file.  Please try again." red
		echo 
	fi
}

function restoreBackup_onlineFile
{
	echo 
	say @B"Please input URL (including https:// or http://) of your Trafficserver configuration backup file, ending in .tar.gz" yellow
	read backupFileURL
	echo 
	cd /tmp && d_status=$(curl -sw '%{http_code}' $backupFileURL -o OneClickCDNRestore_tmp.tar.gz)
	if [ "$d_status" = "200" ] ; then
		echo 
		say @B"Restoring backup..." green
		tar zcf $CurrentDir/OneClickCDN$(date +"%Y%m%d").tar.gz /usr/local/etc/trafficserver
		cd /tmp && tar zxf OneClickCDNRestore_tmp.tar.gz
		cd /usr/local/etc/trafficserver && rm -fr *
		cp -rf /tmp/usr/local/etc/trafficserver/* .
		sleep 2
		if [ -f /usr/local/etc/trafficserver/records.config ] ; then
			say @B"Configuration successfully restored from backup file." green
			chown -R nobody /etc/trafficserver/ssl/
			chmod -R 0760 /etc/trafficserver/ssl/
			/usr/local/bin/trafficserver restart
			echo 
		else
			say "Failed to restore configuration file from backup.  Please check your backup file." red
			echo 
		fi
	else
		say "Download error $d_status.  Please check and try again." red
		echo 
	fi
}

function main
{
	current_dir=$(pwd)
	display_license
	OS=UNSUPPORTED
	if [ "x$OS_CHECK_ENABLED" != "xOFF" ] ; then
		check_OS
	fi
	echo 
	say @B"Your OS is $OS" green
	echo 
	echo "Checking Traffic Server installation..."
	check_TS
	if [ $TS_INSTALLED = 0 ] ; then
		echo 
		say @B"Traffic Server not installed.  Would you like to install it now?" yellow
		echo 
		echo "Depending on your server specs, you may or may not need to add some SWAP before you proceed."
		echo "This script needs 1500 MB of RAM for the first time to build from source.  It runs perfectly on a 512 MB VPS once it finishes the installation."
		echo "If you think you don't have enough RAM now, please quit, add more SWAP, and run this script again."
		echo 
		say "Please indicate if you would like to install now: (Y/N)" yellow blue
		read install_or_not
		if [ "x$install_or_not" != "xY" ] && [ "x$install_or_not" != "xy" ] ; then
			echo 
			say "Aborted!" red
			echo 
			exit 0
		fi
		if [ "x$OS" = "xCENTOS7" ] || [ "x$OS" = "xCENTOS8" ] ; then
			install_TS_CentOS
		else
			install_TS
		fi
		echo 
		echo "Configuring Traffic Server..."
		config_main_records
		echo 
		echo "Would you like to configure cache rules automatically? [Y/N]"
		read do_config_cache_rules
		if [ "x$do_config_cache_rules" = "xY" ] || [ "x$do_config_cache_rules" = "xy" ] ; then
			echo "Configuring cache rules..."
			config_cache_rules
			say @B"Cache rules configured successfully." green
		else
			echo "You can configure cache rules manually at /etc/trafficserver/cache.config.  Make sure to run \"trafficserver restart\" after changing the cache rules."
		fi
		echo 
		echo "Configuring cache size..."
		config_cache_storage
		config_cache_partitioning
		enable_header_rewriter
		echo "Would you like Traffic Server to cache dynamic content? [Y/N]"
		read do_cache_dynamic_content
		if [ "x$do_cache_dynamic_content" = "xY" ] || [ "x$do_cache_dynamic_content" = "xy" ] ; then
			echo "Updating cache rules..."
			config_cache_dynamic_content
		else
			say @B"Traffic Server will not cache dynamic content!" yellow
			echo 
		fi
		echo "Would you like to enable \"Access-Control-Allow-Origin\" header (CORS)?"
		echo "Please choose Y if you have no idea what it is. [Y/N]"
		read do_enable_CORS
		if [ "x$do_enable_CORS" = "xY" ] || [ "x$do_enable_CORS" = "xy" ] ; then
			enable_CORS
		else
			say @B"CORS not configured." yellow
			echo 
		fi
		echo "The \"server\" header can be a short phrase, like \"shc-cdn-server 1.0.0\", or \"Traffic Server 8.0.8\"."
		echo "If you do not change it, the default value is \"ATS/${TS_VERSION}\""
		echo "Would you like to change it? [Y/N]"
		read do_change_server_header
		if [ "x$do_change_server_header" = "xY" ] || [ "x$do_change_server_header" = "xy" ] ; then
			customize_server_header
		else
			say @B"Server header tag value not changed." yellow
			echo 
		fi
		say @B"Configuration successfully finished!" green
		echo "Please proceed to the next step and add your first CDN website."
		restart_switch=1
		echo 
	else
		echo 
		say @B"Traffic Server installed and running!" green
		restart_switch=0
		echo 
	fi
	key=1
	while [ $key != 0 ] ; do
		echo 
		say @B"How can I help you today?" cyan
		echo 
		echo "1 - List all current CDN websites."
		echo "2 - Advanced cache control."
		echo "3 - Add a CDN website."
		echo "4 - Configure SSL for a website."
		echo "5 - Locate configuration and log files."
		echo "6 - View stats of a website."
		echo "7 - List useful commands."
		echo "8 - Display author information."
		echo "11 - Change IP address of a website."
		echo "12 - Remove a CDN website."
		echo "13 - Reconfigure Traffic Server."
		echo "14 - Renew Let's Encrypt certificates."
		echo "21 - Backup Trafficserver configurations and certificates to file."
		echo "22 - Restore Trafficserver configurations and certificates from a local backup file."
		echo "23 - Restore Trafficserver configurations and certificates from a URL."
		echo "0 - Save all changes and quit this script."
		echo "Please select 1/2/3/4/5/6/7/8/11/12/13/14/21/22/23/0: "
		read key
		case $key in 
			1 ) 		echo 
					cat /etc/trafficserver/hostsavailable.sun
						;;
			2 ) 		advanced_cache_control
						;;
			3 )		add_cdn
					restart_switch=1
						;;
			4 ) 		config_ssl_selection
					restart_switch=1
						;;
			5 ) 		display_config_locations
						;;
			6 ) 		view_stats
						;;
			7 ) 		display_useful_commands
						;;
			8 ) 		display_license
						;;
			73 )		if [ "x$REVERSE_PROXY_MODE_ENABLED" = "xON" ] ; then
						add_reverse_proxy
					fi
					restart_switch=1
						;;
			11 )		change_cdn_ip
					restart_switch=1
						;;
			12 )		remove_cdn_website
						restart_switch=1
						;;
			13 )		reconfigure_traffic_server
					restart_switch=1
						;;
			14 )		renew_le_certificate
						;;
			21 )		backupConfiguration
						;;
			22 )		restoreBackup_localFile
						;;
			23 )		restoreBackup_onlineFile
						;;
			0 ) 		say_goodbye
						;;
		esac
	done
	exit 0
}

###############################################################
#                                                             #
#               The main function starts here.                #
#                                                             #
###############################################################

CurrentDir=$(pwd)
main