Bug 1719413 - Init NntpModuleLoader.jsm and NntpService.jsm to start implementing NNTP in JS. r=mkmelin

Differential Revision: https://phabricator.services.mozilla.com/D119594

--HG--
extra : amend_source : a8db3944cf93faca4235f8a5222916ed91ef06a9

mailnews/mailnews.js

@@ -330,6 +330,10 @@ pref("mailnews.reply_quoting_selection.multi_word", true);
 pref("mailnews.smtp.jsmodule", false);
 pref("mailnews.smtp.loglevel", "Warn");
 
+// If true, NntpService.jsm is used. Otherwise, nsNntpService.cpp is used.
+pref("mailnews.nntp.jsmodule", false);
+pref("mailnews.nntp.loglevel", "Warn");
+
 pref("mail.operate_on_msgs_in_collapsed_threads", false);
 pref("mail.warn_on_collapsed_thread_operation", true);
 pref("mail.warn_on_shift_delete", true);

mailnews/news/src/NntpModuleLoader.jsm

@@ -0,0 +1,81 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const EXPORTED_SYMBOLS = ["NntpModuleLoader"];
+
+var { ComponentUtils } = ChromeUtils.import(
+  "resource://gre/modules/ComponentUtils.jsm"
+);
+var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+/**
+ * Determine whether to use nsNntpService.cpp or NntpService.jsm. When
+ * `mailnews.nntp.jsmodule` is `true`, use NntpService.jsm.
+ */
+function NntpModuleLoader() {
+  try {
+    this.loadModule();
+  } catch (e) {
+    Cu.reportError(e);
+  }
+}
+
+var nntpJSModules = [
+  // moduleName, interfaceId, contractId
+  [
+    "NntpService",
+    "{b13db263-a219-4168-aeaf-8266f001087e}",
+    "@mozilla.org/messenger/nntpservice;1",
+  ],
+];
+
+NntpModuleLoader.prototype = {
+  QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
+
+  observe() {
+    // Nothing to do here, just need the entry so this is instantiated.
+  },
+
+  loadModule() {
+    if (Services.prefs.getBoolPref("mailnews.nntp.jsmodule", false)) {
+      let registrar = Components.manager.QueryInterface(
+        Ci.nsIComponentRegistrar
+      );
+
+      for (let [moduleName, interfaceId, contractId] of nntpJSModules) {
+        // Load a module.
+        let scope = ChromeUtils.import(`resource:///modules/${moduleName}.jsm`);
+        scope.NSGetFactory = ComponentUtils.generateNSGetFactory([
+          scope[moduleName],
+        ]);
+
+        // Register a module.
+        let classId = Components.ID(interfaceId);
+        registrar.registerFactory(
+          classId,
+          "",
+          contractId,
+          lazyFactoryFor(scope, classId)
+        );
+      }
+
+      dump("[NntpModuleLoader] Using NntpService.jsm\n");
+    } else {
+      dump("[NntpModuleLoader] Using nsNntpService.cpp\n");
+    }
+  },
+};
+
+function lazyFactoryFor(backendScope, classID) {
+  return {
+    createInstance(aOuter, aIID) {
+      let realFactory = backendScope.NSGetFactory(classID);
+      return realFactory.createInstance(aOuter, aIID);
+    },
+    lockFactory(lock) {
+      let realFactory = backendScope.NSGetFactory(classID);
+      return realFactory.lockFactory(lock);
+    },
+  };
+}

mailnews/news/src/NntpService.jsm

@@ -0,0 +1,20 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const EXPORTED_SYMBOLS = ["NntpService"];
+
+/**
+ * Set the mailnews.nntp.jsmodule pref to true to use this module.
+ *
+ * @implements {nsINntpService}
+ */
+class NntpService {
+  QueryInterface = ChromeUtils.generateQI(["nsINntpService"]);
+
+  getNewNews(server, uri, getOld, urlListener, msgWindow) {}
+}
+
+NntpService.prototype.classID = Components.ID(
+  "{b13db263-a219-4168-aeaf-8266f001087e}"
+);

mailnews/news/src/components.conf

@@ -10,5 +10,11 @@ Classes = [
     'contract_ids': ['@mozilla.org/autocomplete/search;1?name=news'],
     'jsm': 'resource:///modules/NewsAutoCompleteSearch.jsm',
     'constructor': 'NewsAutoCompleteSearch',
+  }, {
+    'cid': '{977853d0-7710-436d-8e80-e270ef52c17c}',
+    'contract_ids': ['@mozilla.org/messenger/nntp-module-loader;1'],
+    'jsm': 'resource:///modules/NntpModuleLoader.jsm',
+    'constructor': 'NntpModuleLoader',
+    'categories': {'profile-after-change': 'NntpModuleLoader'},
   },
 ]

mailnews/news/src/moz.build

@@ -20,6 +20,8 @@ SOURCES += [
 
 EXTRA_JS_MODULES += [
     "NewsAutoCompleteSearch.jsm",
+    "NntpModuleLoader.jsm",
+    "NntpService.jsm",
 ]
 
 XPCOM_MANIFESTS += [