fix: Fix unmodified placeholder replacing the actual value when updating

When updating global storages and user storages a property is not
updated by "StoragesService::updateStorage()" if the value matches the
unmodified placeholder. However, userglobal storages are not updated
through the "StoragesService"; as only the authentication mechanism is
updated it is directly done with "saveBackendOptions()" in
"IUserProvided" or "UserGlobalAuth". Due to this the unmodified
placeholder value needs to be explicitly checked in those cases and
replaced by the actual value (note that in this case it is not possible
to just skip updating a specific property).

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

apps/files_external/lib/Lib/Auth/Password/UserGlobalAuth.php

@@ -9,6 +9,7 @@
 namespace OCA\Files_External\Lib\Auth\Password;
 
 use OCA\Files_External\Lib\Auth\AuthMechanism;
+use OCA\Files_External\Lib\DefinitionParameter;
 use OCA\Files_External\Lib\InsufficientDataForMeaningfulAnswerException;
 use OCA\Files_External\Lib\StorageConfig;
 use OCA\Files_External\Service\BackendService;
@@ -41,6 +42,12 @@ public function saveBackendOptions(IUser $user, $id, $backendOptions) {
 		if (!isset($backendOptions['user']) && !isset($backendOptions['password'])) {
 			return;
 		}
+
+		if ($backendOptions['password'] === DefinitionParameter::UNMODIFIED_PLACEHOLDER) {
+			$oldCredentials = $this->credentialsManager->retrieve($user->getUID(), self::CREDENTIALS_IDENTIFIER);
+			$backendOptions['password'] = $oldCredentials['password'];
+		}
+
 		// make sure we're not setting any unexpected keys
 		$credentials = [
 			'user' => $backendOptions['user'],

apps/files_external/lib/Lib/Auth/Password/UserProvided.php

@@ -47,6 +47,11 @@ private function getCredentialsIdentifier($storageId) {
 	}
 
 	public function saveBackendOptions(IUser $user, $mountId, array $options) {
+		if ($options['password'] === DefinitionParameter::UNMODIFIED_PLACEHOLDER) {
+			$oldCredentials = $this->credentialsManager->retrieve($user->getUID(), $this->getCredentialsIdentifier($mountId));
+			$options['password'] = $oldCredentials['password'];
+		}
+
 		$this->credentialsManager->store($user->getUID(), $this->getCredentialsIdentifier($mountId), [
 			'user' => $options['user'], // explicitly copy the fields we want instead of just passing the entire $options array
 			'password' => $options['password'] // this way we prevent users from being able to modify any other field

build/integration/files_features/external-storage.feature

@@ -80,6 +80,22 @@ Feature: external-storage
     Then fields of last external storage match with
       | status | 0 |
 
+  Scenario: Save an external storage again with an unmodified password provided by user
+    Given Logging in using web as "admin"
+    And logged in user creates external global storage
+      | mountPoint     | "ExternalStorageTest" |
+      | backend        | "owncloud" |
+      | authMechanism  | "password::userprovided" |
+      | backendOptions | {"host":"http://localhost:8080","secure":false} |
+    And fields of last external storage match with
+      | status | 2 |
+    And logged in user updates last external userglobal storage
+      | backendOptions | {"user":"admin","password":"admin"} |
+    When logged in user updates last external userglobal storage
+      | backendOptions | {"user":"admin","password":"__unmodified__"} |
+    Then fields of last external storage match with
+      | status | 0 |
+
   Scenario: Save an external storage with global credentials provided by user
     Given Logging in using web as "admin"
     And logged in user creates external global storage
@@ -93,3 +109,19 @@ Feature: external-storage
       | backendOptions | {"user":"admin","password":"admin"} |
     Then fields of last external storage match with
       | status | 0 |
+
+  Scenario: Save an external storage again with unmodified global credentials provided by user
+    Given Logging in using web as "admin"
+    And logged in user creates external global storage
+      | mountPoint     | "ExternalStorageTest" |
+      | backend        | "owncloud" |
+      | authMechanism  | "password::global::user" |
+      | backendOptions | {"host":"http://localhost:8080","secure":false} |
+    And fields of last external storage match with
+      | status | 2 |
+    And logged in user updates last external userglobal storage
+      | backendOptions | {"user":"admin","password":"admin"} |
+    When logged in user updates last external userglobal storage
+      | backendOptions | {"user":"admin","password":"__unmodified__"} |
+    Then fields of last external storage match with
+      | status | 0 |