htaccess RewriteCond require user

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There is a problem I am having, and I'm pulling my hair out on how to solve it:

in root folder I have a htaccess file with the following rules:

RewriteCond %{REQUEST_FILENAME} !-s
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME}/index.php !-s
RewriteCond %{REQUEST_FILENAME}/index.html !-s
RewriteCond %{REQUEST_FILENAME}/index.htm !-s
RewriteRule ^(.*)$ redirect.php [QSA]

So my goal is to rewrite to redirect.php if the file/directory/index file is not found.

This works perfectly well for my entire site, so no problems... until I have a folder that is protected by password with the following htaccess file:

AuthUserFile /path/to/htpasswd
AuthName EnterPassword
AuthType Basic

require user adminUserName

It seems that apache regards going to this folder as invalid and performs the rewrite to redirect.php.

BUT, if I am already authenticated (by disabling the rewrite above, logging in, then re-enabling the rewrite again), it works...

I have tried adding the following to my root htaccess file before the rule I have above:

RewriteRule ^secureFolder(.*)$ - [L]

And it doesn't work; the following works, but it defeats the purpose of my redirect.php:

RewriteRule ^(.*)$ - [L]

Any ideas welcome!

UPDATE: 2013-10-31 14:00 ET

Well, I have given on dealing with it using HTTP auth. So I implemented a simple password system just for that folder using PHP...

It goes like this:

In .htaccess:

<IfModule mod_php5.c>
    php_value auto_prepend_file /path/to/a/file/in/secureFolder
</IfModule>

in .user.ini (for PHP-FPM, if you use it):

auto_prepend_file = /path/to/a/file/in/secureFolder

In /path/to/a/file/in/secureFolder:

session_start();
/**
 * Check if logged in
 */
if (!isset($_SESSION['adminLogin'])) {
    include('/path/to/loginTemplate');
    exit;
}

In /path/to/loginTemplate:

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = isset($_POST['username']) ? $_POST['username'] : null;
    $password = isset($_POST['password']) ? $_POST['password'] : null;
    if (
        $username == 'username'
        && sha1($password) == 'somehashedvalueofyourpassword'
    ) {
        $_SESSION['adminLogin'] = true;
        header('refresh: 0');
    } else {
        $message = 'Incorrect login';
    }
}
?>
<!DOCTYPE html>
<html>
<head>
    <title>Login</title>
</head>
<body>
<?php if (isset($message)) echo $message ?>
<form action="" method="post">
    <p>
        <label>Username:</label>
        <input type="text" name="username" />
    </p>
    <p>
        <label>Password:</label>
        <input type="password" name="password" />
    </p>
    <p>
        <input type="submit" value="Login" />
    </p>
</form>
</body>
</html>

And a logout.php:

<?php
session_start();

unset($_SESSION['adminLogin']);

$location = empty($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '/admin.contests/';
header('Location: ' . $location);
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On

You can try:

DOCUEMENT/.htaccess:

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-s
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME}/index.php !-s
RewriteCond %{REQUEST_FILENAME}/index.html !-s
RewriteCond %{REQUEST_FILENAME}/index.htm !-s
RewriteRule ^(.*)$ redirect.php [L]

DOCUEMENT/folder/.htaccess: With an extra RewriteEngine On line:

RewriteEngine On

AuthUserFile /path/to/htpasswd AuthName EnterPassword AuthType Basic require user adminUserName