--- /dev/null
+<?php
+
+namespace Drupal\Core\Session;
+
+/**
+ * Defines an account interface which represents the current user.
+ *
+ * Defines an object that has a user id, roles and can have session data. The
+ * interface is implemented both by the global session and the user entity.
+ *
+ * @ingroup user_api
+ */
+interface AccountInterface {
+
+ /**
+ * Role ID for anonymous users.
+ */
+ const ANONYMOUS_ROLE = 'anonymous';
+
+ /**
+ * Role ID for authenticated users.
+ */
+ const AUTHENTICATED_ROLE = 'authenticated';
+
+ /**
+ * Returns the user ID or 0 for anonymous.
+ *
+ * @return int
+ * The user ID.
+ */
+ public function id();
+
+ /**
+ * Returns a list of roles.
+ *
+ * @param bool $exclude_locked_roles
+ * (optional) If TRUE, locked roles (anonymous/authenticated) are not returned.
+ *
+ * @return array
+ * List of role IDs.
+ */
+ public function getRoles($exclude_locked_roles = FALSE);
+
+ /**
+ * Checks whether a user has a certain permission.
+ *
+ * @param string $permission
+ * The permission string to check.
+ *
+ * @return bool
+ * TRUE if the user has the permission, FALSE otherwise.
+ */
+ public function hasPermission($permission);
+
+ /**
+ * Returns TRUE if the account is authenticated.
+ *
+ * @return bool
+ * TRUE if the account is authenticated.
+ */
+ public function isAuthenticated();
+
+ /**
+ * Returns TRUE if the account is anonymous.
+ *
+ * @return bool
+ * TRUE if the account is anonymous.
+ */
+ public function isAnonymous();
+
+ /**
+ * Returns the preferred language code of the account.
+ *
+ * @param bool $fallback_to_default
+ * (optional) Whether the return value will fall back to the site default
+ * language if the user has no language preference.
+ *
+ * @return string
+ * The language code that is preferred by the account. If the preferred
+ * language is not set or is a language not configured anymore on the site,
+ * the site default is returned or an empty string is returned (if
+ * $fallback_to_default is FALSE).
+ */
+ public function getPreferredLangcode($fallback_to_default = TRUE);
+
+ /**
+ * Returns the preferred administrative language code of the account.
+ *
+ * Defines which language is used on administrative pages.
+ *
+ * @param bool $fallback_to_default
+ * (optional) Whether the return value will fall back to the site default
+ * language if the user has no administration language preference.
+ *
+ * @return string
+ * The language code that is preferred by the account for administration
+ * pages. If the preferred language is not set or is a language not
+ * configured anymore on the site, the site default is returned or an empty
+ * string is returned (if $fallback_to_default is FALSE).
+ */
+ public function getPreferredAdminLangcode($fallback_to_default = TRUE);
+
+ /**
+ * Returns the unaltered login name of this account.
+ *
+ * @return string
+ * An unsanitized plain-text string with the name of this account that is
+ * used to log in. Only display this name to admins and to the user who owns
+ * this account, and only in the context of the name used to log in. For
+ * any other display purposes, use
+ * \Drupal\Core\Session\AccountInterface::getDisplayName() instead.
+ *
+ * @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
+ * Use \Drupal\Core\Session\AccountInterface::getAccountName() or
+ * \Drupal\user\UserInterface::getDisplayName() instead.
+ */
+ public function getUsername();
+
+ /**
+ * Returns the unaltered login name of this account.
+ *
+ * @return string
+ * An unsanitized plain-text string with the name of this account that is
+ * used to log in. Only display this name to admins and to the user who owns
+ * this account, and only in the context of the name used to login. For
+ * any other display purposes, use
+ * \Drupal\Core\Session\AccountInterface::getDisplayName() instead.
+ */
+ public function getAccountName();
+
+ /**
+ * Returns the display name of this account.
+ *
+ * By default, the passed-in object's 'name' property is used if it exists, or
+ * else, the site-defined value for the 'anonymous' variable. However, a
+ * module may override this by implementing
+ * hook_user_format_name_alter(&$name, $account).
+ *
+ * @see hook_user_format_name_alter()
+ *
+ * @return string|\Drupal\Component\Render\MarkupInterface
+ * Either a string that will be auto-escaped on output or a
+ * MarkupInterface object that is already HTML escaped. Either is safe
+ * to be printed within HTML fragments.
+ */
+ public function getDisplayName();
+
+ /**
+ * Returns the email address of this account.
+ *
+ * @return string
+ * The email address.
+ */
+ public function getEmail();
+
+ /**
+ * Returns the timezone of this account.
+ *
+ * @return string
+ * Name of the timezone.
+ */
+ public function getTimeZone();
+
+ /**
+ * The timestamp when the account last accessed the site.
+ *
+ * A value of 0 means the user has never accessed the site.
+ *
+ * @return int
+ * Timestamp of the last access.
+ */
+ public function getLastAccessedTime();
+
+}