htmlviewer-directediting: HTML rendering in Nextcloud iOS app

- htmlviewer: IEditor + Bridge + srcdoc iframe template + content controller
- text app: open() bridges text/html to htmlviewer template
- idempotent install.sh for re-deployment after app updates
- iPhone-tested 2026-09-11

HtmlDirectEditorBridge.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 HtmlViewer / patch by Hermes Agent
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * Bridge called from OCA\Text\DirectEditing\TextDirectEditor::open()
+ * for text/html files. Reuses the htmlviewer DirectEditing template
+ * so the mobile apps (hard-coded editor registry) render HTML in a
+ * sandboxed iframe instead of showing source via QuickLook.
+ */
+
+namespace OCA\HtmlViewer\DirectEditing;
+
+use OCA\HtmlViewer\AppInfo\Application;
+use OCP\AppFramework\Http\NotFoundResponse;
+use OCP\AppFramework\Http\Response;
+use OCP\AppFramework\Http\TemplateResponse;
+use OCP\DirectEditing\IToken;
+use OCP\Server;
+
+class HtmlDirectEditorBridge {
+
+	public static function openHtml(IToken $token): Response {
+		try {
+			$file = $token->getFile();
+
+			return new TemplateResponse(
+				Application::APP_ID,
+				'directEditing',
+				[
+					'fileId' => $file->getId(),
+					'fileName' => $file->getName(),
+					'fileContent' => $file->getContent(),
+				],
+				'base'
+			);
+		} catch (\Throwable) {
+			return new NotFoundResponse();
+		}
+	}
+}