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diff --git a/web/modules/contrib/permissions_by_term/src/AccessStorageInterface.php b/web/modules/contrib/permissions_by_term/src/AccessStorageInterface.php
new file mode 100644
index 000000000..edea45e80
--- /dev/null
+++ b/web/modules/contrib/permissions_by_term/src/AccessStorageInterface.php
@@ -0,0 +1,183 @@
+<?php
+
+namespace Drupal\permissions_by_term;
+
+use \Drupal\Core\Form\FormState;
+
+/**
+ * Defines an interface for access storage classes.
+ */
+interface AccessStorageInterface {
+
+  /**
+   * Checks if the submitted users are existing.
+   *
+   * If an user isn't existing, set an error message.
+   *
+   * @param \Drupal\Core\Form\FormState $form_state
+   */
+  public function checkIfUsersExists(FormState $form_state);
+
+  /**
+   * Gets user term permissions by tid.
+   *
+   * @param int $term_id
+   *
+   * @return mixed
+   *   Existing term permissions.
+   */
+  public function getExistingUserTermPermissionsByTid($term_id);
+
+  /**
+   * Gets role term permissions by tid.
+   *
+   * @param int $term_id
+   *
+   * @return mixed
+   *   Existing role term permissions.
+   */
+  public function getExistingRoleTermPermissionsByTid($term_id);
+
+  /**
+   * Gets single user id by user name.
+   *
+   * @param string $sUsername
+   *   An user name.
+   *
+   * @return int
+   *   User id.
+   */
+  public function getUserIdByName($sUsername);
+
+  /**
+   * Gets multiple user ids by user names.
+   *
+   * @param array $aUserNames
+   *   An array with user names.
+   *
+   * @return array
+   *   User ids.
+   */
+  public function getUserIdsByNames($aUserNames);
+
+  /**
+   * Gets the user names from users.
+   *
+   * Users which have granted access for a taxonomy term.
+   *
+   * @param int $term_id
+   *
+   * @return mixed
+   *   Gets user ids, which are allowed to access.
+   */
+  public function getAllowedUserIds($term_id);
+
+  /**
+   * Deletes term permissions by user id.
+   *
+   * @param array $aUserIdsAccessRemove
+   *   An array with user ids, which access will be removed.
+   * @param int $term_id
+   *   The term id to remove.
+   */
+  public function deleteTermPermissionsByUserIds($aUserIdsAccessRemove, $term_id);
+
+  /**
+   * Deletes term permissions by role ids.
+   *
+   * @param array $aRoleIdsAccessRemove
+   *   An array with role ids, that will be removed.
+   * @param int $term_id
+   *   The term id.
+   */
+  public function deleteTermPermissionsByRoleIds($aRoleIdsAccessRemove, $term_id);
+
+  /**
+   * Adds term permissions by user ids.
+   *
+   * @param array $aUserIdsGrantedAccess
+   *   The user ids which will get granted access.
+   * @param int $term_id
+   *
+   * @throws \Exception
+   */
+  public function addTermPermissionsByUserIds($aUserIdsGrantedAccess, $term_id);
+
+  /**
+   * Adds term permissions by role ids.
+   *
+   * @param array $aRoleIdsGrantedAccess
+   *   The role ids which will gain access.
+   * @param int $term_id
+   *
+   * @throws \Exception
+   */
+  public function addTermPermissionsByRoleIds($aRoleIdsGrantedAccess, $term_id);
+
+  /**
+   * Gets the term id by term name.
+   *
+   * @param string $sTermName
+   *   The term name.
+   *
+   * @return int
+   *   The term id.
+   */
+  public function getTermIdByName($sTermName);
+
+  /**
+   * Gets the taxonomy name by id.
+   *
+   * @param int $term_id
+   *   The taxonomy term id.
+   *
+   * @return string
+   *   Gets a term name by an id.
+   */
+  public function getTermNameById($term_id);
+
+  /**
+   * Saves term permissions by users.
+   *
+   * Opposite to save term permission by roles.
+   *
+   * @param \Drupal\Core\Form\FormState $form_state
+   * @param int $term_id
+   *
+   * @return array
+   *   Data for database queries.
+   */
+  public function saveTermPermissions(FormState $form_state, $term_id);
+
+  /**
+   * Prepares the data which has to be applied to the database.
+   *
+   * @param array $aExistingUserPermissions
+   *   The permissions for existing user.
+   * @param array $aSubmittedUserIdsGrantedAccess
+   *   The user ids which get access.
+   * @param array $aExistingRoleIdsGrantedAccess
+   *   The existing role ids.
+   * @param array $aSubmittedRolesGrantedAccess
+   *   The user roles which get access.
+   *
+   * @return array
+   *   User ID and role data.
+   */
+  public function getPreparedDataForDatabaseQueries($aExistingUserPermissions,
+                                                    $aSubmittedUserIdsGrantedAccess,
+                                                    $aExistingRoleIdsGrantedAccess,
+                                                    $aSubmittedRolesGrantedAccess);
+
+  /**
+   * The form value for allowed users as string to be shown to the user.
+   *
+   * @param \Drupal\user\Entity\User[] $aAllowedUsers
+   *   An array with the allowed users.
+   *
+   * @return null|string
+   *   Either null or the user name.
+   */
+  public function getUserFormValue($aAllowedUsers);
+
+}