create keypair for ownCloud with empty passphrase, will be used for public link shares

apps/files_encryption/lib/crypt.php

@@ -763,7 +763,7 @@ class Crypt {
 			$util = new Util( $view, $user );
 				
 			// Check that the user is encryption capable
-			if ( $util->ready() ) {
+			if ( $util->ready() && $user == 'ownCloud' ) {
 				// Construct array of just UIDs for Keymanager{}
 				$userIds[] = $user;
 					
@@ -827,16 +827,13 @@ class Crypt {
 			foreach ( $content as $c) {
 				$path = substr($c['path'], 5);
 				if ( $filesView->is_dir($path) ) {
-					error_log("dive into $path");
 					$result &= self::updateKeyfile($path);
 				} else {
-					error_log("encKeyFileToMultipleUsers $path");
 					$shares = \OCP\Share::getUsersSharingFile( $path, true );
 					$result &= self::encKeyfileToMultipleUsers($shares, $path);
 				}
 			}
 		} else {
-			error_log("encKeyFileToMultipleUsers single file: " . $path);
 			$shares = \OCP\Share::getUsersSharingFile( $path, true );
 			$result = self::encKeyfileToMultipleUsers($shares, $path);
 		}

apps/files_encryption/lib/session.php

@@ -27,6 +27,34 @@ namespace OCA\Encryption;
  */
 
 class Session {
+	
+	/**
+	 * @brief if session is started, check if ownCloud key pair is set up, if not create it
+	 * 
+	 * The ownCloud key pair is used to allow public link sharing even if encryption is enabled
+	 */
+	public function __construct() {
+		$view = new \OC\Files\View('/');
+		if (!$view->is_dir('owncloud_private_key')) {
+			$view->mkdir('owncloud_private_key');
+		}
+		
+		if (!$view->file_exists("/public-keys/owncloud.public.key") || !$view->file_exists("/owncloud_private_key/owncloud.private.key") ) {
+			
+			$keypair = Crypt::createKeypair();
+			
+			\OC_FileProxy::$enabled = false;
+			// Save public key
+			$view->file_put_contents( '/public-keys/owncloud.public.key', $keypair['publicKey'] );
+			// Encrypt private key empthy passphrase
+			$encryptedPrivateKey = Crypt::symmetricEncryptFileContent( $keypair['privateKey'], '' );
+			// Save private key
+			error_log("encrypted private key: " . $encryptedPrivateKey );
+			$view->file_put_contents( '/owncloud_private_key/owncloud.private.key', $encryptedPrivateKey );
+			
+			\OC_FileProxy::$enabled = true;
+		}
+	}
 
 	/**
 	 * @brief Sets user private key to session

lib/public/share.php

@@ -219,7 +219,7 @@ class Share {
 			}
 			
 			if ($result->fetchRow()) {
-				$shares[] = self::SHARE_TYPE_LINK;
+				$shares[] = "ownCloud";
 			}
 		}