JS -- Add a sandbox based on quickjs

* quickjs-eval.js has been generated using https://github.com/mozilla/pdf.js.quickjs/
 * lazy load of sandbox code
 * Rewrite tests to use the sandbox
 * Add a task `watch-sandbox` which update bundle pdf.sandbox.js on change in the sandbox code

web/app_options.js

@@ -223,6 +223,14 @@ const defaultOptions = {
     value: false,
     kind: OptionKind.API,
   },
+  scriptingSrc: {
+    /** @type {string} */
+    value:
+      typeof PDFJSDev === "undefined" || !PDFJSDev.test("PRODUCTION")
+        ? "../build/generic/build/pdf.sandbox.js"
+        : "../build/pdf.sandbox.js",
+    kind: OptionKind.VIEWER,
+  },
   verbosity: {
     /** @type {number} */
     value: 1,

web/devcom.js

@@ -0,0 +1,43 @@
+/* Copyright 2017 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { DefaultExternalServices, PDFViewerApplication } from "./app.js";
+import { loadScript, shadow } from "pdfjs-lib";
+
+const DevCom = {};
+
+class DevExternalServices extends DefaultExternalServices {
+  static get scripting() {
+    const promise = loadScript("../build/pdf.sandbox.js").then(() => {
+      return window.pdfjsSandbox.QuickJSSandbox();
+    });
+    const sandbox = {
+      createSandbox(data) {
+        promise.then(sbx => sbx.create(data));
+      },
+      dispatchEventInSandbox(event) {
+        promise.then(sbx => sbx.dispatchEvent(event));
+      },
+      destroySandbox() {
+        promise.then(sbx => sbx.nukeSandbox());
+      },
+    };
+
+    return shadow(this, "scripting", sandbox);
+  }
+}
+PDFViewerApplication.externalServices = DevExternalServices;
+
+export { DevCom };

web/firefoxcom.js

@@ -259,7 +259,7 @@ class FirefoxScripting {
     FirefoxCom.requestSync("createSandbox", data);
   }
 
-  static dispatchEventInSandbox(event, sandboxID) {
+  static dispatchEventInSandbox(event) {
     FirefoxCom.requestSync("dispatchEventInSandbox", event);
   }
 

web/genericcom.js

@@ -14,6 +14,8 @@
  */
 
 import { DefaultExternalServices, PDFViewerApplication } from "./app.js";
+import { loadScript, shadow } from "pdfjs-lib";
+import { AppOptions } from "./app_options.js";
 import { BasePreferences } from "./preferences.js";
 import { DownloadManager } from "./download_manager.js";
 import { GenericL10n } from "./genericl10n.js";
@@ -49,6 +51,25 @@ class GenericExternalServices extends DefaultExternalServices {
   static createL10n({ locale = "en-US" }) {
     return new GenericL10n(locale);
   }
+
+  static get scripting() {
+    const promise = loadScript(AppOptions.get("scriptingSrc")).then(() => {
+      return window.pdfjsSandbox.QuickJSSandbox();
+    });
+    const sandbox = {
+      createSandbox(data) {
+        promise.then(sbx => sbx.create(data));
+      },
+      dispatchEventInSandbox(event) {
+        promise.then(sbx => sbx.dispatchEvent(event));
+      },
+      destroySandbox() {
+        promise.then(sbx => sbx.nukeSandbox());
+      },
+    };
+
+    return shadow(this, "scripting", sandbox);
+  }
 }
 PDFViewerApplication.externalServices = GenericExternalServices;
 

web/viewer.js

@@ -56,6 +56,9 @@ if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("GENERIC")) {
 if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("CHROME")) {
   require("./chromecom.js");
 }
+if (typeof PDFJSDev === "undefined") {
+  import("./devcom.js");
+}
 if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("CHROME || GENERIC")) {
   require("./pdf_print_service.js");
 }