// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module js_injection.mojom;

import "components/js_injection/common/origin_matcher.mojom";
import "mojo/public/mojom/base/string16.mojom";
import "third_party/blink/public/mojom/messaging/message_port_descriptor.mojom";

// JsObject struct represents a JavaScript object we will inject in the main
// JavaScript world of a frame. |js_object_name| will be used as the name
// of the JavaScript object. We will inject the object if the frame's origin
// matches |origin_matcher|. |js_to_browser_messaging| will be used for that
// JavaScript object to send message back to browser side.
struct JsObject {
  mojo_base.mojom.String16 js_object_name;
  pending_associated_remote<JsToBrowserMessaging> js_to_browser_messaging;
  js_injection.mojom.OriginMatcher origin_matcher;
};

// DocumentStartJavaScript struct contains the JavaScript snippet |script| and
// the corresponding |origin_matcher|. We will run the script if the frame's
// origin matches any rules in the |origin_matcher|.
struct DocumentStartJavaScript {
  int32 script_id;
  mojo_base.mojom.String16 script;
  js_injection.mojom.OriginMatcher origin_matcher;
};

// For JavaScript postMessage() API, implemented by browser.
interface JsToBrowserMessaging {
  // Called from renderer, browser receives |message| and possible |ports|,
  // The |message| is an opaque type and the contents are defined by the client
  // of this API.
  PostMessage(mojo_base.mojom.String16 message,
              array<blink.mojom.MessagePortDescriptor> ports);

  // When there is a new BrowserToJsMessaging created in renderer, we need to
  // send/ it to browser, so browser could send message back to Js.
  SetBrowserToJsMessaging(
    pending_associated_remote<BrowserToJsMessaging> browser_to_js_messaging);
};

// For the browser to reply back to injected JavaScript object. Implemented by
// the renderer.
interface BrowserToJsMessaging {
  // Called from browser, to send message to page.
  OnPostMessage(mojo_base.mojom.String16 message);
};

// For browser to configure renderer, implemented by renderer.
interface JsCommunication {
  // Called from browser, to tell renderer that if we need to inject
  // JavaScript objects to the frame based on the |js_objects| array.
  SetJsObjects(array<js_injection.mojom.JsObject> js_objects);

  // Called from browser, to add a script for a frame to run at document start
  // stage. The script will run only if the frame's origin matches any of the
  // allowed_origin_rules.
  AddDocumentStartScript(js_injection.mojom.DocumentStartJavaScript script);

  // Called from browser, to remove the script by the given script_id.
  RemoveDocumentStartScript(int32 script_id);
};