check if some encrypted files are left after the app was disabled and warn the user

apps/files/index.php

@@ -143,5 +143,6 @@ if ($needUpgrade) {
 	$tmpl->assign('usedSpacePercent', (int)$storageInfo['relative']);
 	$tmpl->assign('isPublic', false);
 	$tmpl->assign('publicUploadEnabled', $publicUploadEnabled);
+	$tmpl->assign("encryptedFiles", \OCP\Util::encryptedFiles());
 	$tmpl->printPage();
 }

apps/files/js/files.js

@@ -81,9 +81,23 @@ Files={
 		if (usedSpacePercent > 90) {
 			OC.Notification.show(t('files', 'Your storage is almost full ({usedSpacePercent}%)', {usedSpacePercent: usedSpacePercent}));
 		}
+	},
+
+	displayEncryptionWarning: function() {
+
+		if (!OC.Notification.isHidden()) {
+			return;
+		}
+
+		var encryptedFiles = $('#encryptedFiles').val();
+		if (encryptedFiles === '1') {
+			OC.Notification.show(t('files_encryption', 'Encryption was disabled but your files are still encrypted. Please go to your personal settings to decrypt your files.', "www.schiessle.org"));
+			return;
+		}
 	}
 };
 $(document).ready(function() {
+	Files.displayEncryptionWarning();
 	Files.bindKeyboardShortcuts(document, jQuery);
 	$('#fileList tr').each(function(){
 		//little hack to set unescape filenames in attribute

apps/files/templates/index.php

@@ -121,3 +121,4 @@
 <!-- config hints for javascript -->
 <input type="hidden" name="allowZipDownload" id="allowZipDownload" value="<?php p($_['allowZipDownload']); ?>" />
 <input type="hidden" name="usedSpacePercent" id="usedSpacePercent" value="<?php p($_['usedSpacePercent']); ?>" />
+<input type="hidden" name="encryptedFiles" id="encryptedFiles" value="<?php $_['encryptedFiles'] ? p('1') : p('0'); ?>" />

lib/public/util.php

@@ -122,6 +122,14 @@ class Util {
 		return(\OC_Util::formatDate( $timestamp, $dateOnly ));
 	}
 
+	/**
+	 * @brief check if some encrypted files are stored
+	 * @return bool
+	 */
+	public static function encryptedFiles() {
+		return \OC_Util::encryptedFiles();
+	}
+	
 	/**
 	 * @brief Creates an absolute url
 	 * @param string $app app

lib/util.php

@@ -312,6 +312,23 @@ class OC_Util {
 		return $errors;
 	}
 
+	/**
+	 * @brief check if there are still some encrypted files stored
+	 * @return boolean
+	 */
+	public static function encryptedFiles() {
+		//check if encryption was enabled in the past
+		$encryptedFiles = false;
+		if (OC_App::isEnabled('files_encryption') === false) {
+			$view = new OC\Files\View('/' . OCP\User::getUser());
+			if ($view->file_exists('/files_encryption/keyfiles')) {
+				$encryptedFiles = true;
+			}
+		}
+		
+		return $encryptedFiles;
+	}
+	
 	/**
 	* Check for correct file permissions of data directory
 	* @return array arrays with error messages and hints

settings/personal.php

@@ -25,13 +25,7 @@ $userLang=OC_Preferences::getValue( OC_User::getUser(), 'core', 'lang', OC_L10N:
 $languageCodes=OC_L10N::findAvailableLanguages();
 
 //check if encryption was enabled in the past
-$enableDecryptAll = false;
-if (OC_App::isEnabled('files_encryption') === false) {
-	$view = new OC\Files\View('/'.OCP\User::getUser());
-	if($view->file_exists('/files_encryption/keyfiles')) {
-		$enableDecryptAll = true;
-	}
-}
+$enableDecryptAll = OC_Util::encryptedFiles();
 
 // array of common languages
 $commonlangcodes = array(