Rss-Bridge/lib/Configuration.php

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<?php
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/**
* This file is part of RSS-Bridge, a PHP project capable of generating RSS and
* Atom feeds for websites that don't have one.
*
* For the full license information, please view the UNLICENSE file distributed
* with this source code.
*
* @package Core
* @license http://unlicense.org/ UNLICENSE
* @link https://github.com/rss-bridge/rss-bridge
*/
/**
* Configuration module for RSS-Bridge.
*
* This class implements a configuration module for RSS-Bridge.
*/
final class Configuration {
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/**
* Holds the current release version of RSS-Bridge.
*
* Do not access this property directly!
* Use {@see Configuration::getVersion()} instead.
*
* @var string
*
* @todo Replace this property by a constant.
*/
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public static $VERSION = 'dev.2020-11-10';
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/**
* Holds the configuration data.
*
* Do not access this property directly!
* Use {@see Configuration::getConfig()} instead.
*
* @var array|null
*/
private static $config = null;
/**
* Throw an exception when trying to create a new instance of this class.
*
* @throws \LogicException if called.
*/
public function __construct(){
throw new \LogicException('Can\'t create object of this class!');
}
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/**
* Verifies the current installation of RSS-Bridge and PHP.
*
* Returns an error message and aborts execution if the installation does
* not satisfy the requirements of RSS-Bridge.
*
* **Requirements**
* - PHP 5.6.0 or higher
* - `openssl` extension
* - `libxml` extension
* - `mbstring` extension
* - `simplexml` extension
* - `curl` extension
* - `json` extension
* - The cache folder specified by {@see PATH_CACHE} requires write permission
* - The whitelist file specified by {@see WHITELIST} requires write permission
*
* @link http://php.net/supported-versions.php PHP Supported Versions
* @link http://php.net/manual/en/book.openssl.php OpenSSL
* @link http://php.net/manual/en/book.libxml.php libxml
* @link http://php.net/manual/en/book.mbstring.php Multibyte String (mbstring)
* @link http://php.net/manual/en/book.simplexml.php SimpleXML
* @link http://php.net/manual/en/book.curl.php Client URL Library (curl)
* @link http://php.net/manual/en/book.json.php JavaScript Object Notation (json)
*
* @return void
*/
public static function verifyInstallation() {
// Check PHP version
if(version_compare(PHP_VERSION, '5.6.0') === -1)
self::reportError('RSS-Bridge requires at least PHP version 5.6.0!');
// extensions check
if(!extension_loaded('openssl'))
self::reportError('"openssl" extension not loaded. Please check "php.ini"');
if(!extension_loaded('libxml'))
self::reportError('"libxml" extension not loaded. Please check "php.ini"');
if(!extension_loaded('mbstring'))
self::reportError('"mbstring" extension not loaded. Please check "php.ini"');
if(!extension_loaded('simplexml'))
self::reportError('"simplexml" extension not loaded. Please check "php.ini"');
// Allow RSS-Bridge to run without curl module in CLI mode without root certificates
if(!extension_loaded('curl') && !(php_sapi_name() === 'cli' && empty(ini_get('curl.cainfo'))))
self::reportError('"curl" extension not loaded. Please check "php.ini"');
if(!extension_loaded('json'))
self::reportError('"json" extension not loaded. Please check "php.ini"');
// Check cache folder permissions (write permissions required)
if(!is_writable(PATH_CACHE))
self::reportError('RSS-Bridge does not have write permissions for ' . PATH_CACHE . '!');
}
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/**
* Loads the configuration from disk and checks if the parameters are valid.
*
* Returns an error message and aborts execution if the configuration is invalid.
*
* The RSS-Bridge configuration is split into two files:
* - {@see FILE_CONFIG_DEFAULT} The default configuration file that ships
* with every release of RSS-Bridge (do not modify this file!).
* - {@see FILE_CONFIG} The local configuration file that can be modified
* by server administrators.
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*
* RSS-Bridge will first load {@see FILE_CONFIG_DEFAULT} into memory and then
* replace parameters with the contents of {@see FILE_CONFIG}. That way new
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* parameters are automatically initialized with default values and custom
* configurations can be reduced to the minimum set of parametes necessary
* (only the ones that changed).
*
* The configuration files must be placed in the root folder of RSS-Bridge
* (next to `index.php`).
*
* _Notice_: The configuration is stored in {@see Configuration::$config}.
*
* @return void
*/
public static function loadConfiguration() {
if(!file_exists(FILE_CONFIG_DEFAULT))
self::reportError('The default configuration file is missing at ' . FILE_CONFIG_DEFAULT);
Configuration::$config = parse_ini_file(FILE_CONFIG_DEFAULT, true, INI_SCANNER_TYPED);
if(!Configuration::$config)
self::reportError('Error parsing ' . FILE_CONFIG_DEFAULT);
if(file_exists(FILE_CONFIG)) {
// Replace default configuration with custom settings
foreach(parse_ini_file(FILE_CONFIG, true, INI_SCANNER_TYPED) as $header => $section) {
foreach($section as $key => $value) {
// Skip unknown sections and keys
if(array_key_exists($header, Configuration::$config) && array_key_exists($key, Configuration::$config[$header])) {
Configuration::$config[$header][$key] = $value;
}
}
}
}
if(!is_string(self::getConfig('system', 'timezone'))
|| !in_array(self::getConfig('system', 'timezone'), timezone_identifiers_list(DateTimeZone::ALL_WITH_BC)))
self::reportConfigurationError('system', 'timezone');
date_default_timezone_set(self::getConfig('system', 'timezone'));
if(!is_string(self::getConfig('proxy', 'url')))
self::reportConfigurationError('proxy', 'url', 'Is not a valid string');
if(!empty(self::getConfig('proxy', 'url'))) {
/** URL of the proxy server */
define('PROXY_URL', self::getConfig('proxy', 'url'));
}
if(!is_bool(self::getConfig('proxy', 'by_bridge')))
self::reportConfigurationError('proxy', 'by_bridge', 'Is not a valid Boolean');
/** True if proxy usage can be enabled selectively for each bridge */
define('PROXY_BYBRIDGE', self::getConfig('proxy', 'by_bridge'));
if(!is_string(self::getConfig('proxy', 'name')))
self::reportConfigurationError('proxy', 'name', 'Is not a valid string');
/** Name of the proxy server */
define('PROXY_NAME', self::getConfig('proxy', 'name'));
if(!is_string(self::getConfig('cache', 'type')))
self::reportConfigurationError('cache', 'type', 'Is not a valid string');
if(!is_bool(self::getConfig('cache', 'custom_timeout')))
self::reportConfigurationError('cache', 'custom_timeout', 'Is not a valid Boolean');
/** True if the cache timeout can be specified by the user */
define('CUSTOM_CACHE_TIMEOUT', self::getConfig('cache', 'custom_timeout'));
if(!is_bool(self::getConfig('authentication', 'enable')))
self::reportConfigurationError('authentication', 'enable', 'Is not a valid Boolean');
if(!is_string(self::getConfig('authentication', 'username')))
self::reportConfigurationError('authentication', 'username', 'Is not a valid string');
if(!is_string(self::getConfig('authentication', 'password')))
self::reportConfigurationError('authentication', 'password', 'Is not a valid string');
if(!empty(self::getConfig('admin', 'email'))
&& !filter_var(self::getConfig('admin', 'email'), FILTER_VALIDATE_EMAIL))
self::reportConfigurationError('admin', 'email', 'Is not a valid email address');
if(!is_string(self::getConfig('error', 'output')))
self::reportConfigurationError('error', 'output', 'Is not a valid String');
if(!is_numeric(self::getConfig('error', 'report_limit'))
|| self::getConfig('error', 'report_limit') < 1)
self::reportConfigurationError('admin', 'report_limit', 'Value is invalid');
}
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/**
* Returns the value of a parameter identified by section and key.
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*
* @param string $section The section name.
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* @param string $key The property name (key).
* @return mixed|null The parameter value.
*/
public static function getConfig($section, $key) {
if(array_key_exists($section, self::$config) && array_key_exists($key, self::$config[$section])) {
return self::$config[$section][$key];
}
return null;
}
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/**
* Returns the current version string of RSS-Bridge.
*
* This function returns the contents of {@see Configuration::$VERSION} for
* regular installations and the git branch name and commit id for instances
* running in a git environment.
*
* @return string The version string.
*/
public static function getVersion() {
$headFile = PATH_ROOT . '.git/HEAD';
// '@' is used to mute open_basedir warning
if(@is_readable($headFile)) {
$revisionHashFile = '.git/' . substr(file_get_contents($headFile), 5, -1);
$parts = explode('/', $revisionHashFile);
if(isset($parts[3])) {
$branchName = $parts[3];
if(file_exists($revisionHashFile)) {
return 'git.' . $branchName . '.' . substr(file_get_contents($revisionHashFile), 0, 7);
}
}
}
return Configuration::$VERSION;
}
/**
* Reports an configuration error for the specified section and key to the
* user and ends execution
*
* @param string $section The section name
* @param string $key The configuration key
* @param string $message An optional message to the user
*
* @return void
*/
private static function reportConfigurationError($section, $key, $message = '') {
$report = "Parameter [{$section}] => \"{$key}\" is invalid!" . PHP_EOL;
if(file_exists(FILE_CONFIG)) {
$report .= 'Please check your configuration file at ' . FILE_CONFIG . PHP_EOL;
} elseif(!file_exists(FILE_CONFIG_DEFAULT)) {
$report .= 'The default configuration file is missing at ' . FILE_CONFIG_DEFAULT . PHP_EOL;
} else {
$report .= 'The default configuration file is broken.' . PHP_EOL
. 'Restore the original file from ' . REPOSITORY . PHP_EOL;
}
$report .= $message;
self::reportError($report);
}
/**
* Reports an error message to the user and ends execution
*
* @param string $message The error message
*
* @return void
*/
private static function reportError($message) {
header('Content-Type: text/plain', true, 500);
die('Configuration error' . PHP_EOL . $message);
}
}