process_settings.php

<?php
/*
    All Emoncms code is released under the GNU Affero General Public License.
    See COPYRIGHT.txt and LICENSE.txt.

    ---------------------------------------------------------------------
    Emoncms - open source energy visualisation
    Part of the OpenEnergyMonitor project:
    http://openenergymonitor.org
*/

// no direct access
defined('EMONCMS_EXEC') or die('Restricted access');

require_once('Lib/enum.php');

// Load settings.php
$settings_error = false;

if (file_exists(dirname(__FILE__)."/settings.php")) {
    require_once('default-settings.php');
    require_once('settings.php');
    if (!isset($settings)) {
        require_once('Lib/process_old_settings.php');
        //$settings_error = true;
        //$settings_error_title = "settings.php file error";
        //$settings_error_message = "It looks like you are using an old version of settings.php try re-creating your settings.php file from default-settings.php";
    } else {
        $settings = array_replace_recursive($_settings, $settings);
    }
} elseif (file_exists(dirname(__FILE__)."/settings.ini")) {
    $CONFIG_INI = parse_ini_file("default-settings.ini", true, INI_SCANNER_TYPED);
    $CUSTOM_INI = parse_ini_file("settings.ini", true, INI_SCANNER_TYPED);
#    $CONFIG_INI = parse_ini_file("default-settings.ini", true);
#    $CUSTOM_INI = parse_ini_file("settings.ini", true);
    $settings = ini_merge($CONFIG_INI, $CUSTOM_INI);
    // $settings = ini_check_envvars($settings);
} else {
    $settings_error = true;
    $settings_error_title = "missing settings file";
    $settings_error_message = "Create a settings.ini file from a example.settings.ini template";
}

if ($settings_error) {
    if (PHP_SAPI === 'cli') {
        echo "$settings_error_title\n";
        echo "$settings_error_message\n";
    } else {
        echo "<div style='width:600px; background-color:#eee; padding:20px; font-family:arial,serif;'>";
        echo "<h3>$settings_error_title</h3>";
        echo "<p>$settings_error_message</p>";
        echo "</div>";
    }
    die;
}

// ---------------------------------------------------------------------------------------
if (is_dir($settings["emoncms_dir"]."/modules")) {
    $linked_modules_dir = $settings["emoncms_dir"]."/modules";
} else {
    $linked_modules_dir = $settings["emoncms_dir"];
}

// Set display errors
if (isset($settings["display_errors"]) && ($settings["display_errors"])) {
    error_reporting(E_ALL);
    ini_set('display_errors', 'on');
}

// ---------------------------------------------------------------------------------------
// FUNCTIONS
// ---------------------------------------------------------------------------------------

// This function takes two arrays of settings and merges them, using
// the value from $overrides where it differs from the one in $defaults.
function ini_merge($defaults, $overrides)
{
    foreach ($overrides as $k => $v) {
        if (is_array($v)) {
            $defaults[$k] = ini_merge($defaults[$k], $overrides[$k]);
        } else {
            $defaults[$k] = resolve_env_vars($v, $defaults[$k]);
#            $defaults[$k] = $v;
        }
    }

    return $defaults;
};

// This function iterates over all the config file entries, replacing values
// of the format {{VAR_NAME}} with the environment variable 'VAR_NAME'.
//
// This can be useful in containerised setups, or testing environments.

function resolve_env_vars($value)
{
    // To do any processing we need a string, and at least one pair of {{ }}
    // Otherwise just return what we got.
    if (!is_string($value) ||
            strpos($value, '{{') === false ||
            strpos($value, '}}') === false) {
        return $value;
    }

    preg_match_all('/{{([^}]+)}}/', $value, $matches);
    foreach ($matches[1] as $match) {
        $env_name = $match;
        $env_value = getenv($env_name);
        if ($env_value === false) {
            echo "<p>Error: environment var '${env_name}' not defined</p>";
            return $value;
        }

        $value = str_replace('{{'.$env_name.'}}', $env_value, $value);
    }

    // Convert booleans from strings
    if (strcasecmp($value, "true") == 0) {
        $value = true;
    } elseif (strcasecmp($value, 'false') == 0) {
        $value = false;

    // Convert numbers from strings
    } elseif (is_numeric($value)) {
        $value = $value + 0;
    }

    // Set the new value
    return $value;
}