Issue #2172941 by vijaycs85, damiankloip: Endless looping on...

Issue #2172941 by vijaycs85, damiankloip: Endless looping on Config::castValue() for undefined config data type.

core/lib/Drupal/Core/Config/Config.php

@@ -592,6 +592,9 @@ protected function getSchemaWrapper() {
    *
    * @return mixed
    *   The value cast to the type indicated in the schema.
+   *
+   * @throws \Drupal\Core\Config\UnsupportedDataTypeConfigException
+   *   Exception on unsupported/undefined data type deducted.
    */
   protected function castValue($key, $value) {
     if ($value === NULL) {
@@ -627,9 +630,12 @@ protected function castValue($key, $value) {
       }
     }
     else {
-      // Any non-scalar value must be an array.
+      // Throw exception on any non-scalar or non-array value.
       if (!is_array($value)) {
-        $value = (array) $value;
+        throw new UnsupportedDataTypeConfigException(String::format('Invalid data type for config element @name:@key', array(
+          '@name' => $this->getName(),
+          '@key' => $key,
+        )));
       }
       // Recurse into any nested keys.
       foreach ($value as $nested_value_key => $nested_value) {

core/lib/Drupal/Core/Config/FileStorage.php

@@ -7,7 +7,9 @@
 
 namespace Drupal\Core\Config;
 
+use Drupal\Component\Utility\String;
 use Symfony\Component\Yaml\Dumper;
+use Symfony\Component\Yaml\Exception\DumpException;
 use Symfony\Component\Yaml\Parser;
 
 /**
@@ -105,11 +107,17 @@ public function readMultiple(array $names) {
   /**
    * Implements Drupal\Core\Config\StorageInterface::write().
    *
-   * @throws Symfony\Component\Yaml\Exception\DumpException
+   * @throws \Drupal\Core\Config\UnsupportedDataTypeConfigException
    * @throws \Drupal\Core\Config\StorageException
    */
   public function write($name, array $data) {
-    $data = $this->encode($data);
+    try {
+      $data = $this->encode($data);
+    }
+    catch(DumpException $e) {
+      throw new UnsupportedDataTypeConfigException(String::format('Invalid data type for used in config: @name', array('@name' => $name)));
+    }
+
     $target = $this->getFilePath($name);
     $status = @file_put_contents($target, $data);
     if ($status === FALSE) {

core/lib/Drupal/Core/Config/UnsupportedDataTypeConfigException.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Config\UnsupportedDataTypeConfigException.
+ */
+
+namespace Drupal\Core\Config;
+
+/**
+ * Exception thrown when a config data type is invalid.
+ */
+class UnsupportedDataTypeConfigException extends ConfigException {
+}

core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php

@@ -7,9 +7,11 @@
 
 namespace Drupal\config\Tests;
 
+use Drupal\Component\Utility\String;
 use Drupal\Core\Config\ConfigNameException;
 use Drupal\simpletest\DrupalUnitTestBase;
 use Drupal\Core\Config\FileStorage;
+use Drupal\Core\Config\UnsupportedDataTypeConfigException;
 
 /**
  * Tests CRUD operations on configuration objects.
@@ -225,12 +227,31 @@ public function testDataTypes() {
     $this->assertIdentical($config->get(), $data);
     $this->assertIdentical($storage->read($name), $data);
 
+    // Test that setting an unsupported type for a config object with a schema
+    // fails.
     try {
       $config->set('stream', fopen(__FILE__, 'r'))->save();
       $this->fail('No Exception thrown upon saving invalid data type.');
     }
-    catch (\Exception $e) {
-      $this->pass(format_string('%class thrown upon saving invalid data type.', array(
+    catch (UnsupportedDataTypeConfigException $e) {
+      $this->pass(String::format('%class thrown upon saving invalid data type.', array(
+        '%class' => get_class($e),
+      )));
+    }
+
+    // Test that setting an unsupported type for a config object with no schema
+    // also fails.
+    $typed_config_manager = $this->container->get('config.typed');
+    $config_name = 'config_test.no_schema';
+    $config = $this->container->get('config.factory')->get($config_name);
+    $this->assertFalse($typed_config_manager->hasConfigSchema($config_name));
+
+    try {
+      $config->set('stream', fopen(__FILE__, 'r'))->save();
+      $this->fail('No Exception thrown upon saving invalid data type.');
+    }
+    catch (UnsupportedDataTypeConfigException $e) {
+      $this->pass(String::format('%class thrown upon saving invalid data type.', array(
         '%class' => get_class($e),
       )));
     }

core/modules/config/tests/config_test/config/schema/config_test.schema.yml

@@ -131,3 +131,38 @@ config_test.schema_data_types:
       type: sequence
       sequence:
         - type: boolean
+
+config_test.types:
+  type: mapping
+  label: 'Configuration type'
+  mapping:
+    array:
+      type: sequence
+      label: 'Array'
+      sequence:
+        - type: string
+          label: 'Item'
+    boolean:
+      type: boolean
+      label: 'Boolean'
+    float:
+      type: float
+      label: 'Float'
+    exp:
+      type: float
+      label: 'Exponential'
+    hex:
+      type: integer
+      label: 'Hexadecimal'
+    int:
+      type: integer
+      label: 'Integer'
+    octal:
+      type: integer
+      label: 'Octal'
+    string:
+      type: string
+      label: 'String'
+    string_int:
+      type: string
+      label: 'String integer'