fix: user login and creation with LDAP (#2107)

* Corrected if statement to check if a results was returned by the LDAP search. And decoded the user_attributes from binary data to string

* removed trailing spaces

* Revert asserts in LDAP unit test back

Since an empty tuple is still a result, an user is created and the result should not be false.

* Simplified code

* Extended the LDAP implementation

* fix ldap authentication and user creation

* modified docs to include new LDAP environment variables

* update tests and linting

* add libldap-2.4-2 as runtime dependency for the api

---------

Co-authored-by: Erik Landkroon <eriklandkroon@gmail.com>

docs/docs/documentation/getting-started/installation/backend-config.md

@@ -68,6 +68,11 @@ Changing the webworker settings may cause unforeseen memory leak issues with Mea
 | LDAP_SERVER_URL     |  None   | LDAP server URL (e.g. ldap://ldap.example.com)                                                                     |
 | LDAP_TLS_INSECURE   |  False  | Do not verify server certificate when using secure LDAP                                                            |
 | LDAP_TLS_CACERTFILE |  None   | File path to Certificate Authority used to verify server certificate (e.g. `/path/to/ca.crt`)                      |
-| LDAP_BIND_TEMPLATE  |  None   | Templated DN for users, `{}` will be replaced with the username (e.g. `cn={},dc=example,dc=com`, `{}@example.com`) |
 | LDAP_BASE_DN        |  None   | Starting point when searching for users authentication (e.g. `CN=Users,DC=xx,DC=yy,DC=de`)                         |
+| LDAP_QUERY_BIND     |  None   | A bind user for LDAP search queries (e.g. `cn=admin,cn=users,dc=example,dc=com`)                                   |
+| LDAP_QUERY_PASSWORD |  None   | The password for the bind user used in LDAP_QUERY_BIND                                                             |
+| LDAP_USER_FILTER    |  None   | The LDAP search filter to find users (e.g. `(&(                                                                    | ({id_attribute}={input})({mail_attribute}={input}))(objectClass=person))`).<br/> **Note** `id_attribute` and `mail_attribute` will be replaced with `LDAP_ID_ATTRIBUTE` and `LDAP_MAIL_ATTRIBUTE`, respectively. `input` will be replaced with either the username or email the user logs in with. |
 | LDAP_ADMIN_FILTER   |  None   | Optional LDAP filter, which tells Mealie the LDAP user is an admin (e.g. `(memberOf=cn=admins,dc=example,dc=com)`) |
+| LDAP_ID_ATTRIBUTE   |   uid   | The LDAP attribute that maps to the user's id                                                                      |
+| LDAP_NAME_ATTRIBUTE |  name   | The LDAP attribute that maps to the user's name                                                                    |
+| LDAP_MAIL_ATTRIBUTE |  mail   | The LDAP attribute that maps to the user's email                                                                   |