print a warning if a user wants to reset his password and encryption is enabled

core/lostpassword/controller.php

@@ -8,8 +8,11 @@
 
 class OC_Core_LostPassword_Controller {
 	protected static function displayLostPasswordPage($error, $requested) {
+		$encrypted = OC_App::isEnabled('files_encryption');
 		OC_Template::printGuestPage('core/lostpassword', 'lostpassword',
-			array('error' => $error, 'requested' => $requested));
+			array('error' => $error,
+				'requested' => $requested,
+				'encrypted' => $encrypted));
 	}
 	
 	protected static function displayResetPasswordPage($success, $args) {
@@ -29,7 +32,14 @@ class OC_Core_LostPassword_Controller {
 	}
 
 	public static function sendEmail($args) {
-		if (OC_User::userExists($_POST['user'])) {
+
+		if(isset($_POST['noEncryption']) || isset($_POST['continue'])) {
+			$continue = true;
+		} else {
+			$continue = false;
+		}
+
+		if (OC_User::userExists($_POST['user']) && $continue) {
 			$token = hash('sha256', OC_Util::generate_random_bytes(30).OC_Config::getValue('passwordsalt', ''));
 			OC_Preferences::setValue($_POST['user'], 'owncloud', 'lostpassword',
 				hash('sha256', $token)); // Hash the token again to prevent timing attacks

core/lostpassword/templates/lostpassword.php

@@ -17,6 +17,14 @@
 				<input type="text" name="user" id="user" placeholder="" value="" autocomplete="off" required autofocus />
 				<label for="user" class="infield"><?php print_unescaped($l->t( 'Username' )); ?></label>
 				<img class="svg" src="<?php print_unescaped(image_path('', 'actions/user.svg')); ?>" alt=""/>
+				<?php if ($_['encrypted']): ?>
+				<br /><br />
+				<?php print_unescaped($l->t('Your files seems to be encrypted. If you didn\'t have enabled the recovery key there will be no way to get your data back once the password was resetted. If you are not sure what to do, please contact your administrator first before continue. Do you really want to continue?')); ?><br />
+				<input type="checkbox" name="continue" value="Yes" />
+					<?php print_unescaped($l->t('Yes, I really want to reset my password now')); ?><br/><br/>
+				<?php else: ?>
+				<input type="checkbox" name="noEncryption" value="Yes" checked />
+				<?php endif; ?>
 			</p>
 			<input type="submit" id="submit" value="<?php print_unescaped($l->t('Request reset')); ?>" />
 		</fieldset>