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diff --git a/web/modules/contrib/filefield_sources/src/FilefieldSourceInterface.php b/web/modules/contrib/filefield_sources/src/FilefieldSourceInterface.php
new file mode 100644
index 000000000..8ea45ca7c
--- /dev/null
+++ b/web/modules/contrib/filefield_sources/src/FilefieldSourceInterface.php
@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\filefield_sources\FilefieldSourceInterface.
+ */
+
+namespace Drupal\filefield_sources;
+
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides an interface for file field source plugins.
+ *
+ * @see \Drupal\filefield_sources\FilefieldSourceManager
+ * @see \Drupal\filefield_sources\Annotation\FilefieldSource
+ * @see plugin_api
+ *
+ * @ingroup filefield_sources
+ */
+interface FilefieldSourceInterface {
+
+  /**
+   * Value callback for file field source plugin.
+   *
+   * @param array $element
+   *   An associative array containing the properties of the element.
+   * @param mixed $input
+   *   The incoming input to populate the form element. If this is FALSE,
+   *   the element's default value should be returned.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return mixed
+   *   The value to assign to the element.
+   */
+  public static function value(array &$element, &$input, FormStateInterface $form_state);
+
+  /**
+   * Process callback for file field source plugin.
+   *
+   * @param array $element
+   *   An associative array containing the properties and children of the
+   *   generic input element.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   * @param array $complete_form
+   *   The complete form structure.
+   *
+   * @return array
+   *   The processed element.
+   */
+  public static function process(array &$element, FormStateInterface $form_state, array &$complete_form);
+
+}