Can check if an email address exists or not

src/helpers/account_helper.rs

@@ -77,6 +77,14 @@ pub fn get_user_by_login_token(token: &str, client: &APIClient) -> ResultBoxErro
     )
 }
 
+/// Check out whether an email address exists or not
+pub fn exists_mail(mail: &str) -> ResultBoxError<bool> {
+    database::QueryInfo::new(USERS_TABLE)
+        .cond("mail", mail)
+        .exec_count()
+        .map(|r| r > 0)
+}
+
 /// Destroy a given user login tokens
 pub fn destroy_login_tokens(id: &UserID, client: &APIClient) -> ResultBoxError<()> {
     database::delete(DeleteQuery::new(USER_ACCESS_TOKENS_TABLE)