#!/bin/bash

set -e

. /usr/share/yunohost/helpers

do_pre_regen() {
    pending_dir=$1

    cd /usr/share/yunohost/conf/postfix

    postfix_dir="${pending_dir}/etc/postfix"
    mkdir -p "$postfix_dir"

    default_dir="${pending_dir}/etc/default/"
    mkdir -p "$default_dir"

    # install plain conf files
    cp plain/* "$postfix_dir"

    # prepare main.cf conf file
    main_domain=$(cat /etc/yunohost/current_host)

    # Support different strategy for security configurations
    export compatibility="$(yunohost settings get 'security.postfix.compatibility')"

    # Add possibility to specify a relay
    # Could be useful with some isp with no 25 port open or more complex setup
    export relay_port=""
    export relay_user=""
    export relay_host="$(yunohost settings get 'smtp.relay.host')"
    if [ -n "${relay_host}" ]; then
        relay_port="$(yunohost settings get 'smtp.relay.port')"
        relay_user="$(yunohost settings get 'smtp.relay.user')"
        relay_password="$(yunohost settings get 'smtp.relay.password')"

        # Avoid to display "Relay account paswword" to other users
        touch ${postfix_dir}/sasl_passwd
        chmod 750 ${postfix_dir}/sasl_passwd
        # Avoid "postmap: warning: removing zero-length database file"
        chown postfix ${pending_dir}/etc/postfix
        chown postfix ${pending_dir}/etc/postfix/sasl_passwd

        cat <<<"[${relay_host}]:${relay_port} ${relay_user}:${relay_password}" >${postfix_dir}/sasl_passwd
    fi
    export main_domain
    export domain_list="$YNH_DOMAINS"
    ynh_render_template "main.cf" "${postfix_dir}/main.cf"
    ynh_render_template "sni" "${postfix_dir}/sni"

    cat postsrsd \
        | sed "s/{{ main_domain }}/${main_domain}/g" \
        | sed "s/{{ domain_list }}/${YNH_DOMAINS}/g" \
            >"${default_dir}/postsrsd"

    # adapt it for IPv4-only hosts
    ipv6="$(yunohost settings get 'smtp.allow_ipv6')"
    if [ "$ipv6" == "False" ] || [ ! -f /proc/net/if_inet6 ]; then
        sed -i \
            's/ \[::ffff:127.0.0.0\]\/104 \[::1\]\/128//g' \
            "${postfix_dir}/main.cf"
        sed -i \
            's/inet_interfaces = all/&\ninet_protocols = ipv4/' \
            "${postfix_dir}/main.cf"
    fi
}

do_post_regen() {
    regen_conf_files=$1

    if [ -e /etc/postfix/sasl_passwd ]; then
        chmod 750 /etc/postfix/sasl_passwd*
        chown postfix:root /etc/postfix/sasl_passwd*
        postmap /etc/postfix/sasl_passwd
    fi

    postmap -F hash:/etc/postfix/sni

    [[ -z "$regen_conf_files" ]] \
        || { systemctl restart postfix && systemctl restart postsrsd; }

}

do_$1_regen ${@:2}