[core] Add configuration for bridges, allowing private bridges (#1343)

actions/DisplayAction.php

@@ -131,6 +131,7 @@ class DisplayAction extends ActionAbstract {
 
 			try {
 				$bridge->setDatas($bridge_params);
+				$bridge->loadConfiguration();
 				$bridge->collectData();
 
 				$items = $bridge->getItems();

lib/BridgeAbstract.php

@@ -61,6 +61,13 @@ abstract class BridgeAbstract implements BridgeInterface {
 	 */
 	const CACHE_TIMEOUT = 3600;
 
+	/**
+	 * Configuration for the bridge
+	 *
+	 * Use {@see BridgeAbstract::getConfiguration()} to read this parameter
+	 */
+	const CONFIGURATION = array();
+
 	/**
 	 * Parameters for the bridge
 	 *
@@ -238,6 +245,36 @@ abstract class BridgeAbstract implements BridgeInterface {
 
 	}
 
+	/**
+	 * Loads configuration for the bridge
+	 *
+	 * Returns errors and aborts execution if the provided configuration is
+	 * invalid.
+	 *
+	 * @return void
+	 */
+	public function loadConfiguration() {
+		foreach(static::CONFIGURATION as $optionName => $optionValue) {
+
+			$configurationOption = Configuration::getConfig(get_class($this), $optionName);
+
+			if($configurationOption !== null) {
+				$this->configuration[$optionName] = $configurationOption;
+				continue;
+			}
+
+			if(isset($optionValue['required']) && $optionValue['required'] === true) {
+				returnServerError(
+					'Missing configuration option: '
+					. $optionName
+				);
+			} elseif(isset($optionValue['defaultValue'])) {
+				$this->configuration[$optionName] = $optionValue['defaultValue'];
+			}
+
+		}
+	}
+
 	/**
 	 * Returns the value for the provided input
 	 *
@@ -251,6 +288,19 @@ abstract class BridgeAbstract implements BridgeInterface {
 		return $this->inputs[$this->queriedContext][$input]['value'];
 	}
 
+	/**
+	 * Returns the value for the selected configuration
+	 *
+	 * @param string $input The option name
+	 * @return mixed|null The option value or null if the input is not defined
+	 */
+	public function getOption($name){
+		if(!isset($this->configuration[$name])) {
+			return null;
+		}
+		return $this->configuration[$name];
+	}
+
 	/** {@inheritdoc} */
 	public function getDescription(){
 		return static::DESCRIPTION;
@@ -271,6 +321,11 @@ abstract class BridgeAbstract implements BridgeInterface {
 		return static::URI . '/favicon.ico';
 	}
 
+	/** {@inheritdoc} */
+	public function getConfiguration(){
+		return static::CONFIGURATION;
+	}
+
 	/** {@inheritdoc} */
 	public function getParameters(){
 		return static::PARAMETERS;

lib/BridgeInterface.php

@@ -58,6 +58,19 @@ interface BridgeInterface {
 	 */
 	public function collectData();
 
+	/**
+	* Get the user's supplied configuration for the bridge
+	*/
+	public function getConfiguration();
+
+	/**
+	 * Returns the value for the selected configuration
+	 *
+	 * @param string $input The option name
+	 * @return mixed|null The option value or null if the input is not defined
+	 */
+	public function getOption($name);
+
 	/**
 	 * Returns the description
 	 *

lib/Configuration.php

@@ -145,13 +145,10 @@ final class Configuration {
 			// 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)))
@@ -218,13 +215,11 @@ final class Configuration {
 	 * @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;
-
 	}
 
 	/**