#!/bin/bash
#
# module.sh - mysql
#
# Copyright 2019 Luigi Santivetti <luigi.santivetti@gmail.com>

# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

declare -r module="mysql"
source $common_sh

module_enable $module

declare -r etc_d="$mod_rootfs_d/etc"
declare -r initdb_d="$mod_docker_d"
declare -r var_d="$mod_rootfs_d/var"

declare -r mycnf_d="$etc_d/mysql"
declare -r mysql_d="$var_d/lib/mysql"
declare -r log_d="$var_d/log/mysql"

declare -ir mysql_uid="999"

declare -ir mysql_has_dummy_certs=1
if [ $mysql_has_dummy_certs -eq 1 ]; then
	declare -r certificates_d="$mod_staging_d/${module}_dummy_cert"
	declare -r ca_key_f="$certificates_d/${module}_dummy-ca-key.pem"
	declare -r ca_f="$certificates_d/${module}_dummy-ca.pem"

	declare -r server_key_f="$certificates_d/${module}_dummy-server-key.pem"
	declare -r server_req_f="$certificates_d/${module}_dummy-server-req.pem"
	declare -r server_cert_f="$certificates_d/${module}_dummy-server-cert.pem"

	declare -r client_key_f="$certificates_d/${module}_dummy-client-key.pem"
	declare -r client_req_f="$certificates_d/${module}_dummy-client-req.pem"
	declare -r client_cert_f="$certificates_d/${module}_dummy-client-cert.pem"

	# Dup ca to avoid bind mounting the same file twice
	declare -r ca_dup_f="$certificates_d/${module}_dummy-ca-dup.pem"
else
	lets -l -e "official CA certificates not supported"
	exit 1
fi
declare -r certificates_l="$etc_d/mysql_ssl"

# Output files
declare -r dockerfile="Dockerfile"
declare -r dockerfile_f="$mod_docker_d/$dockerfile"
declare -r initdb_f="$initdb_d/initdb.sql"
declare -r mycnf_f="$mycnf_d/my.cnf"
declare -r log_error_f="$log_d/error.txt"
declare -r log_general_f="$log_d/general.txt"
declare -r log_query_f="$log_d/query.txt"
declare -r mysql_cli_bang_f="$mod_docker_d/mysql-cli.sh"

declare -ar mod_more_dirs=( \
	$etc_d $initdb_d $var_d $mycnf_d $log_d $mysql_d \
)

declare -ar mod_more_files=( $mycnf_f $initdb_f $dockerfile_f $mysql_cli_bang_f )
declare -ar mod_more_trefs=( mycnf_t initdb_t dockerfile_t mysql_cli_bang_t )

function tod_watch
{
	__watch_module_common || return $s_err
}

function tod_doins
{
	__doins_module_common || return $s_err
	__mysql_do_log_files  || return $s_err

	# Use certificates provided by Apache
	__mysql_do_dummy_cert || return $s_err
	__mysql_do_links      || return $s_err
}

function tod_clins
{
	__clins_module_common  || return $s_err
	__mysql_undo_log_files || return $s_err
}

function tod_upins
{
	__upins_module_common || return $s_err

	# Use ceritificates provided by Apache
	__mysql_do_dummy_cert || return $s_err
}

function tod_doall
{
	tod_doins
}

function tod_upall
{
	tod_upins
}

function __mysql_do_dummy_cert_helper
{
	# Credits:
	# https://techsparx.com/software-development/docker/damp/mysql-ssl-connection.html

	local -r OPENSSL_SUBJ="/C=US/ST=Utopia/L=Neverland"
	local -r OPENSSL_CA="${OPENSSL_SUBJ}/CN=dummy-CA"
	local -r OPENSSL_SERVER="${OPENSSL_SUBJ}/CN=dummy-server"
	local -r OPENSSL_CLIENT="${OPENSSL_SUBJ}/CN=dummy-client"

	# Generate new CA certificate ca.pem file.
	openssl genrsa 2048 > $ca_key_f

	# TODO This has interaction that must be automated
	openssl req -new -x509 -nodes -days 3600 \
			-subj "${OPENSSL_CA}" \
			-key $ca_key_f -out $ca_f

	# Create the server-side certificates
	# This has more interaction that must be automated

	openssl req -newkey rsa:2048 -days 3600 -nodes \
			-subj "${OPENSSL_SERVER}" \
			-keyout $server_key_f -out $server_req_f
	openssl rsa -in $server_key_f -out $server_key_f

	openssl x509 -req -in $server_req_f -days 3600 \
			-CA $ca_f -CAkey $ca_key_f -set_serial 01 -out $server_cert_f

	# Create the client-side certificates
	openssl req -newkey rsa:2048 -days 3600 -nodes \
			-subj "${OPENSSL_CLIENT}" \
			-keyout $client_key_f -out $client_req_f
	openssl rsa -in $client_key_f -out $client_key_f

	openssl x509 -req -in $client_req_f -days 3600 \
			-CA $ca_f -CAkey $ca_key_f -set_serial 01 -out $client_cert_f

	# Verify the certificates are correct
	openssl verify -CAfile \
			$ca_f $server_cert_f $client_cert_f || return $s_err

	# Duplicate ca as it needs to be mounted client side
	cp -ar $ca_f $ca_dup_f

	set_mode "0644" $mysql_uid $ca_f \
		 $server_key_f $server_req_f $server_cert_f || return $s_err

	# WARNING! The only client expected is apache. This can break other clients
	set_mode "0644" "www-data" \
		 $ca_dup_f $client_key_f $client_cert_f || return $s_err

	set_mode "0600" $mysql_uid $ca_key_f || return $s_err
	set_mode "0755" root $certificates_d || return $s_err
}

function __mysql_do_dummy_cert
{
	if [ $mysql_has_dummy_certs -eq 1 ]; then
		if [ ! -d $certificates_d ]; then
			mkdir -p $certificates_d && \
				pushd $certificates_d >/dev/null || return $s_err
			__mysql_do_dummy_cert_helper 2>&1 | lets -l -x "openssl"
			case "${PIPESTATUS[0]}" in
				$s_err ) lets -l -e "failed to make dummy certificates"
						 popd >/dev/null; return $s_err ;;
			esac
			popd >/dev/null
		fi
	fi;

	lets -l -i "$module SSL cert from: ${certificates_d#$script_dir/}"
	return $s_ok
}

function __mysql_do_links
{
	# NOTE: container path must match localhost path
	#
	# i.e.
	#    localhost:/etc container:/etc                 OK
	#    localhost:/home/luigi container:/home/???     NOT OK
	#
	ln -sf "${certificates_d}" "${certificates_l}"
}

function __mysql_do_log_files
{
	sudo touch $log_error_f $log_general_f $log_query_f || {
		lets -l -e "failed to touch log files"; return $s_err
	}

	set_mode "0755" $mysql_uid $log_d || {
		lets -l -e "failed to set mode $log_d"; return $s_err
	}

	set_mode "0644" $mysql_uid $log_error_f $log_general_f $log_query_f || {
		lets -l -e "failed to set mode log files"; return $s_err
	}
}

function __mysql_undo_log_files
{
	sudo rm -f $log_error_f $log_general_f $log_query_f || {
		lets -l -e "failed remove log files"; return $s_err
	}

	__mysql_do_log_files
}