From 6a14b98dc67d80f61c814921b59078346eb67eab Mon Sep 17 00:00:00 2001
From: Stratop0w <github@p0w.org>
Date: Tue, 16 Jul 2024 14:07:00 +0200
Subject: [PATCH 1/3] feat(add option for case sensitive login)

---
 lib/Config.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/Config.php b/lib/Config.php
index cbd0191..ed7b24c 100644
--- a/lib/Config.php
+++ b/lib/Config.php
@@ -35,6 +35,7 @@ class Config
     const CONFIG_KEY_DB_PASSWORD = 'db_password';
     const CONFIG_KEY_DB_PASSWORD_FILE = 'db_password_file';
     const CONFIG_KEY_HASH_ALGORITHM_FOR_NEW_PASSWORDS = 'hash_algorithm_for_new_passwords';
+    const CONFIG_KEY_FORCE_LOWERCASE_LOGIN = 'force_lowercase_login';
 
     const CONFIG_KEY_QUERIES = 'queries';
     const CONFIG_KEY_GET_PASSWORD_HASH_FOR_USER = 'get_password_hash_for_user';
@@ -339,4 +340,10 @@ private function normalize($string)
         return strtolower(preg_replace("/[-_]/", "", $string));
     }
 
+    // Nextcloud usualy don't use case sensitive login, so here is the option to keep
+    // standard behavior
+    public function forceLowercaseLogin() : bool {
+        return $this->getConfigValueOrFalse(self::CONFIG_KEY_FORCE_LOWERCASE_LOGIN) !== false;
+    }
+
 }

From dabad97a7c4dc2ac421728e52825936f6b36a10c Mon Sep 17 00:00:00 2001
From: Stratop0w <github@p0w.org>
Date: Tue, 16 Jul 2024 14:40:58 +0200
Subject: [PATCH 2/3] feat(case sensitivity login)

---
 lib/UserBackend.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/UserBackend.php b/lib/UserBackend.php
index 8bd833a..bca7cca 100644
--- a/lib/UserBackend.php
+++ b/lib/UserBackend.php
@@ -87,6 +87,10 @@ public function checkPassword($providedUsername, $providedPassword)
         }
 
         if (password_verify($providedPassword, $retrievedPasswordHash)) {
+            if ($this->config->forceLowercaseLogin()) {
+                $providedUsername = strtolower($providedUsername);
+            }
+
             return $providedUsername;
         } else {
             return false;

From 847046163fee37fc12df0e4e7b0986ff179cdc3c Mon Sep 17 00:00:00 2001
From: Stratop0w <github@p0w.org>
Date: Tue, 16 Jul 2024 14:44:47 +0200
Subject: [PATCH 3/3] update(add lowercase login readme)

---
 README.md | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index fc1b539..8b7f902 100644
--- a/README.md
+++ b/README.md
@@ -62,10 +62,11 @@ This app has no user interface. All configuration is done via Nextcloud's system
        //'create_user' => 'INSERT INTO users (local, domain, password_hash) VALUES (split_part(:username, \'@\', 1), split_part(:username, \'@\', 2), :password_hash)',
   ),
  //'hash_algorithm_for_new_passwords' => 'bcrypt',
+ //'force_lowercase_login' => true,
  ),
  ```
 
-There are three types of configuration parameters:
+There are four types of configuration parameters:
 
 ### 1. Database
 
@@ -167,6 +168,17 @@ The config values are `md5`, `sha256`, `sha512`, `argon2i`, `argon2id` respectiv
     user's password is changed, it will be updated to the configured hash algorithm. This eases
      migration to more modern algorithms.
 
+### 4. Optional features
+
+
+##### `force_lowercase_login`
+
+Default behavior of Nextcloud instance with internal user database is to apply submitted login information to lower case, so usernames are case insensitive.
+
+By design, this extention by default will transmit submitted usernames to Nextcloud once authenticated without lowercasing.
+
+If you want to keep default Nextcloud behavior, enable option `force_lowercase_login` and set it's value to `true`.
+
 ## Security
 
 * Password length is limited to 100 characters to prevent denial of service attacks against the