#!/usr/bin/env bash

## constants

BASEDIR=$(dirname "$0")
BASECMD=$(basename "$0")
DB_NAME=sympa
DB_USER="$DB_NAME"
DB_PASS="$DB_NAME"

SYMPA_DOMAIN=''

## functions

function usage {
	echo "$BASECMD <file.sympa>"
}

function assert_file {
	[[ $# != 1 ]] && usage && exit 1
	file="$1"
	[[ ! -f $file ]] && echo "file not found: $file" && exit 2
	true
}

function create_temp {
	echo -n "create_temp..."
	export_name=$(basename $file)
	export_tmp="/tmp/$export_name"
	mkdir "$export_tmp"
	echo OK
}

function uncompress_export_file {
	echo -n "uncompress export file..."
	tar -xf $file -C "$export_tmp"
	echo OK
}

function import_database {
	echo -n "import database $DB_NAME..."
	sudo -u postgres dropdb "$DB_NAME" 2> /dev/null
	sudo -u postgres createdb -O "$DB_USER" "$DB_NAME" 2> /dev/null
	gunzip -c "$export_tmp"/database.psql.gz | PGPASSWORD="$DB_PASS" psql -h localhost -U "$DB_USER" "$DB_NAME"
	echo OK
}

function replace_conf_entry_from_export {
	local export_conf=etc/sympa/sympa/sympa.conf
	local final_conf="/$export_conf"
	local key="$1"
	local pattern="^$key.*"
	local replacement=$(grep $pattern $export_conf)
	local ksh93=${replacement//\//\\/}
	sed -i "s/$pattern/$ksh93/" "$final_conf"
}

function import_files_etc_sympa {
	mv etc/sympa/auth.conf /etc/sympa/
	mv etc/sympa/data_structure.version /etc/sympa/

	replace_conf_entry_from_export domain
	replace_conf_entry_from_export wwsympa_url
	replace_conf_entry_from_export listmaster
	replace_conf_entry_from_export lang

	/opt/miaou-bash/tools/append_or_replace '^aliases_program.*$' 'aliases_program postalias' /etc/sympa/sympa/sympa.conf
}

function import_files_etc_mail_sympa_aliases {
	mv etc/mail/sympa/aliases{,.db} /etc/mail/sympa/
	chown sympa:sympa /etc/mail/sympa/aliases{,.db}
}

function import_files_etc_dkimkeys {
	mkdir -p /etc/dkimkeys
	mv etc/dkimkeys/* /etc/dkimkeys/
	chown sympa:sympa -R /etc/dkimkeys
}

function import_files_lib {
	rm -rf /var/lib/sympa
	mv var/lib/sympa /var/lib
}

function import_files_spool {
	rm -rf /var/spool/sympa
	mv var/spool/sympa /var/spool
}

function import_files {
	echo -n "import files..."
	files_temp="$export_tmp/files"
	mkdir "$files_temp"
	cd "$files_temp"

	tar -xf "$export_tmp/files.tar.gz"

	import_files_etc_sympa
	import_files_etc_mail_sympa_aliases
	[[ -d etc/dkimkeys ]] && import_files_etc_dkimkeys

	import_files_lib
	import_files_spool

	echo OK
}

function import_certbot {

	SYMPA_DOMAIN=$(grep '^domain' /etc/sympa/sympa/sympa.conf | cut -f2)

	if [[ -f "$export_tmp/certbot.tar" ]]; then
		echo "certbot save previous cli.ini"
		cp /etc/letsencrypt/cli.ini "$export_tmp/"

		echo "import certbot..."
		rm -rf /etc/letsencrypt
		tar -xf "$export_tmp/certbot.tar" -C /
		echo OK

		echo "certbot restore previous cli.ini"
		mv "$export_tmp/cli.ini" /etc/letsencrypt/

		echo "convert certbot apache2 authenticator to certbotx nginx authenticator"
		/opt/miaou-bash/tools/append_or_replace '^authenticator =.*$' "authenticator = nginx" /etc/letsencrypt/renewal/$SYMPA_DOMAIN.conf
		/opt/miaou-bash/tools/append_or_replace '^installer =.*$' "installer = nginx" /etc/letsencrypt/renewal/$SYMPA_DOMAIN.conf
	fi

	# add options-ssl-nginx.conf
	if [[ ! -f /etc/letsencrypt/options-ssl-nginx.conf ]]; then
		tee /etc/letsencrypt/options-ssl-nginx.conf << EOF
# This file contains important security parameters. If you modify this file
# manually, Certbot will be unable to automatically provide future security
# updates. Instead, Certbot will print and log an error message with a path to
# the up-to-date file that you will need to refer to when manually updating
# this file. Contents are based on https://ssl-config.mozilla.org

ssl_session_cache shared:le_nginx_SSL:10m;
ssl_session_timeout 1440m;
ssl_session_tickets off;

ssl_protocols TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers off;

ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
EOF
		echo 'options-ssl-nginx.conf created!'
	else
		echo 'options-ssl-nginx.conf already there!'
	fi

	# add ssl-dhparams.pem
	if [[ ! -f /etc/letsencrypt/ssl-dhparams.pem ]]; then
		tee /etc/letsencrypt/ssl-dhparams.pem << EOF
-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
-----END DH PARAMETERS-----
EOF
		echo 'ssl-dhparams.pem created!'
	else
		echo 'ssl-dhparams.pem already there!'
	fi

	# change nginx
	if ! grep -Pq '^\s+listen 443' /etc/nginx/sites-enabled/sympa.conf; then
		tee /etc/nginx/sites-available/sympa.conf << EOF
server {
    listen 80;
    server_name _;
    return 301 https://\$host\$request_uri;
}

server {
    listen 443 ssl;
    server_name $SYMPA_DOMAIN;

    ssl_certificate     /etc/letsencrypt/live/$SYMPA_DOMAIN/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/$SYMPA_DOMAIN/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

    rewrite ^/$ /wws permanent;

    location /wws {
        include fastcgi_params;
        fastcgi_param SERVER_NAME \$host;
        fastcgi_pass  unix:/run/sympa/wwsympa.socket;
    }

    location /static-sympa {
        alias /usr/share/sympa/static_content;
    }

    location /css-sympa {
        alias /var/lib/sympa/css;
    }

    location /pictures-sympa { 
        alias /var/lib/sympa/pictures;
    }
}
EOF
		nginx -t
		systemctl reload nginx
		echo host for nginx installed successfully!
	else
		echo host SSL nginx already activated!
	fi
}

function migrate_sympa {
	echo -n "migrate sympa..."
	/usr/lib/sympa/bin/sympa.pl upgrade 2>&1
	echo OK
}

function stop_services {
	echo -n "stop services..."
	systemctl stop sympa.service
	systemctl stop wwsympa.socket
	systemctl stop postfix.service
	echo OK
}

function start_services {
	echo -n "start services..."
	systemctl start sympa.service
	systemctl start wwsympa.socket
	systemctl start postfix.service
	echo OK
}

function remove_temp {
	echo -n "remove temp..."
	rm -rf "$export_tmp"
	echo OK
}

function configure_postfix {
	echo "$SYMPA_DOMAIN" > /etc/mailname

	/opt/miaou-bash/tools/append_or_replace '^myhostname =.*$' "myhostname = $SYMPA_DOMAIN" /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^alias_maps =.*$' 'alias_maps = hash:/etc/aliases, hash:/etc/mail/sympa/aliases' /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^alias_database =.*$' 'alias_database = hash:/etc/aliases, hash:/etc/mail/sympa/aliases' /etc/postfix/main.cf

	/opt/miaou-bash/tools/append_or_replace '^smtpd_tls_cert_file =.*$' "smtpd_tls_cert_file = /etc/letsencrypt/live/$SYMPA_DOMAIN/fullchain.pem" /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtpd_tls_key_file =.*$' "smtpd_tls_key_file = /etc/letsencrypt/live/$SYMPA_DOMAIN/privkey.pem" /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtpd_tls_security_level =.*$' 'smtpd_tls_security_level = may' /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtpd_tls_received_header =.*$' 'smtpd_tls_received_header = yes' /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtpd_tls_loglevel =.*$' 'smtpd_tls_loglevel = 1' /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtp_tls_cert_file =.*$' "smtp_tls_cert_file = /etc/letsencrypt/live/$SYMPA_DOMAIN/fullchain.pem" /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtp_tls_key_file =.*$' "smtp_tls_key_file = /etc/letsencrypt/live/$SYMPA_DOMAIN/privkey.pem" /etc/postfix/main.cf
	/opt/miaou-bash/tools/append_or_replace '^smtp_tls_security_level =.*$' 'smtp_tls_security_level = may' /etc/postfix/main.cf

	true
}

function import {
	create_temp

	uncompress_export_file
	stop_services
	import_database
	import_files
	import_certbot # SYMPA_DOMAIN got populated!
	configure_postfix

	start_services
	migrate_sympa

	remove_temp
	echo 'IMPORT SUCCESSFUL!'
}

## main

set -Eeu
assert_file $*
import