Validate edit locally token before sending to server

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

src/gui/folderman.cpp

@@ -1498,7 +1498,18 @@ void FolderMan::editFileLocally(const QString &userId, const QString &relPath, c
         showError(accountFound, tr("Could not find a folder to sync."), relPath);
         return;
     }
-
+
+    // Token is an alphanumeric string 128 chars long.
+    // Ensure that is what we received and what we are sending to the server.
+    const QRegularExpression tokenRegex("^[a-zA-Z0-9]{128}$");
+    const auto regexMatch = tokenRegex.match(token);
+
+    // Means invalid token type received, be cautious with bad token
+    if(!regexMatch.hasMatch()) {
+        showError(accountFound, tr("Invalid token received."), tr("Please try again."));
+        return;
+    }
+
     const auto relPathSplit = relPath.split(QLatin1Char('/'));
     if (relPathSplit.size() > 0) {
         Systray::instance()->createEditFileLocallyLoadingDialog(relPathSplit.last());
@@ -1507,7 +1518,9 @@ void FolderMan::editFileLocally(const QString &userId, const QString &relPath, c
         return;
     }
 
-    const auto checkTokenForEditLocally = new SimpleApiJob(accountFound->account(), QStringLiteral("/ocs/v2.php/apps/files/api/v1/openlocaleditor/%1").arg(token));
+    // Sanitise the token
+    const auto encodedToken = QString(QUrl::toPercentEncoding(token));
+    const auto checkTokenForEditLocally = new SimpleApiJob(accountFound->account(), QStringLiteral("/ocs/v2.php/apps/files/api/v1/openlocaleditor/%1").arg(encodedToken));
     checkTokenForEditLocally->setVerb(SimpleApiJob::Verb::Post);
     checkTokenForEditLocally->setBody(QByteArray{"path=/"}.append(relPath.toUtf8()));
     connect(checkTokenForEditLocally, &SimpleApiJob::resultReceived, checkTokenForEditLocally, [this, folderForFile, localFilePath, showError, accountFound, relPath] (int statusCode) {