configure

#!/bin/bash

#### Loading / Writing configuration

function load_prev_config() {

    # load the defaults from the file if it exists
    if [ -f ".config/save" ]; then
        source ".config/save";
    
    # else load some defaults
    else
        echo "No saved settings found, loading defaults for local development setup. "
        SET_MWS_DOMAIN_NAME="localhost"
    fi;
}

function save_current_config() {
    {
        echo "echo \"Loaded previous settings from $(date)\"";
        echo_save_line "SET_MWS_DOMAIN_NAME" "$MWS_DOMAIN_NAME";
        echo_save_line "SET_MWS_SSL_EMAIL" "$MWS_SSL_EMAIL";
    } > .config/save

    echo "Wrote .config/save"
}

function echo_save_line() {
    echo "$1='$2'"
}

#### Reading configuration settings

function read_mws_domain_name() {
    cat << EOF
When running in a production setup, MWS needs to know the domain
name it is running under. Please either enter a domain name now, or
leave it blank to use "$SET_MWS_DOMAIN_NAME". 

EOF

    printf "MWS_DOMAIN_NAME="
    read MWS_DOMAIN_NAME
    if [ -z "$MWS_DOMAIN_NAME" ]
    then
        MWS_DOMAIN_NAME="$SET_MWS_DOMAIN_NAME"
    fi;
    echo "export MWS_DOMAIN_NAME=$MWS_DOMAIN_NAME"
}

function read_mws_ssl_email() {
    cat << EOF
If SSL Certificates should be automatically retrieved, MWS needs to
know an email address to register a new Let’s Encrypt account under.
Please note by entering an email address here, you implicitly agree to
the Let’s Encrypt subscriber agreement currently found under
https://letsencrypt.org/documents/2017.11.15-LE-SA-v1.2.pdf. 
Defaults to "$SET_MWS_SSL_EMAIL".


EOF

    printf "MWS_SSL_EMAIL="
    read MWS_SSL_EMAIL
    if [ -z "$MWS_SSL_EMAIL" ]
    then
        MWS_SSL_EMAIL="$SET_MWS_SSL_EMAIL"
    fi;
    echo "export MWS_SSL_EMAIL=$MWS_SSL_EMAIL"
}

### Writing configuration


function write_nginx_config() {
    echo "DEFAULT_HOST=$MWS_DOMAIN_NAME" > .config/nginx

    echo "Wrote .config/nginx"
}

function write_frontend_config() {
    echo "VIRTUAL_HOST=$MWS_DOMAIN_NAME" > .config/frontend

    if [ ! -z "$MWS_SSL_EMAIL" ]; then
        echo "LETSENCRYPT_HOST=$MWS_DOMAIN_NAME" >> .config/frontend
        echo "LETSENCRYPT_EMAIL=$MWS_SSL_EMAIL"  >> .config/frontend
    fi;

    echo "Wrote .config/frontend"
}

function main() {
    echo "MWS DOCKER CONFIGURATION"

    load_prev_config

    echo ""
    read_mws_domain_name

    echo ""
    read_mws_ssl_email


    echo ""
    echo "WRITING CONFIGURATION"
    
    mkdir -p .config

    save_current_config
    write_nginx_config
    write_frontend_config

    echo "Done. "
}

main