Support webview in dedicate container (#947)

Signed-off-by: Vladyslav Zhukovskyi <vzhukovs@redhat.com>

extensions/eclipse-che-theia-plugin-remote/src/node/plugin-remote-init.ts

@@ -40,6 +40,7 @@ import { PluginReaderExtension } from './plugin-reader-extension';
 import { PluginRemoteNodeImpl } from './plugin-remote-node-impl';
 import { RPCProtocolImpl } from '@theia/plugin-ext/lib/common/rpc-protocol';
 import { TerminalContainerAware } from './terminal-container-aware';
+import { WebviewsContentAware } from './webviews-content-aware';
 import { logger } from '@theia/core';
 import pluginExtBackendModule from '@theia/plugin-ext/lib/plugin-ext-backend-module';
 import pluginRemoteBackendModule from './plugin-remote-backend-module';
@@ -247,6 +248,10 @@ to pick-up automatically a free port`)
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
       (webSocketClient.rpc as any).locals.get(MAIN_RPC_CONTEXT.COMMAND_REGISTRY_EXT.id)
     );
+    WebviewsContentAware.makeWebviewsContentAware(
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (webSocketClient.rpc as any).locals.get(MAIN_RPC_CONTEXT.WEBVIEWS_EXT.id)
+    );
 
     let channelName = '';
     if (process.env.CHE_MACHINE_NAME) {

extensions/eclipse-che-theia-plugin-remote/src/node/webviews-content-aware.ts

@@ -0,0 +1,104 @@
+/**********************************************************************
+ * Copyright (c) 2020 Red Hat, Inc.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ ***********************************************************************/
+
+import * as theia from '@theia/plugin';
+
+import { WebviewImpl, WebviewsExtImpl } from '@theia/plugin-ext/lib/plugin/webviews';
+
+import { Plugin } from '@theia/plugin-ext/src/common/plugin-api-rpc';
+import { Uri } from '@theia/plugin';
+import { overrideUri } from './che-content-aware-utils';
+
+export class RemoteWebview extends WebviewImpl {}
+
+export class WebviewsContentAware {
+  static makeWebviewsContentAware(webviewExt: WebviewsExtImpl): void {
+    const webviewsContentAware = new WebviewsContentAware();
+    webviewsContentAware.overrideVSCodeResourceScheme(webviewExt);
+  }
+
+  overrideVSCodeResourceScheme(webviewExt: WebviewsExtImpl): void {
+    this.rebind$createWebview(webviewExt);
+  }
+
+  // Modify WebviewOptions#localResourceRoots by setting remote side car scheme instead of default file
+  // during webview panel create step. This method activates only when plugin call theia.createWebview
+  // method from remote sidecar. Normally from theia sidecar this method should not be executed.
+  //
+  // localResourceRoots provides paths where extension hosts own resources, styles, scripts, fonts, etc.
+  private rebind$createWebview(webviewExt: WebviewsExtImpl): void {
+    const original$createWebview = webviewExt.createWebview.bind(webviewExt);
+    webviewExt.createWebview = (
+      viewType: string,
+      title: string,
+      showOptions: theia.ViewColumn | theia.WebviewPanelShowOptions,
+      options: theia.WebviewPanelOptions & theia.WebviewOptions,
+      plugin: Plugin
+    ) => {
+      const webviewPanel: theia.WebviewPanel = original$createWebview(
+        viewType,
+        title,
+        showOptions,
+        options.localResourceRoots
+          ? ({
+              enableFindWidget: options.enableFindWidget,
+              retainContextWhenHidden: options.retainContextWhenHidden,
+              enableScripts: options.enableScripts,
+              enableCommandUris: options.enableCommandUris,
+              localResourceRoots: (() => options.localResourceRoots.map(root => overrideUri(root)))(),
+              portMapping: options.portMapping,
+            } as theia.WebviewPanelOptions & theia.WebviewOptions)
+          : options,
+        plugin
+      );
+
+      this.rebind$asWebviewUri(webviewPanel.webview);
+      this.rebind$_htmlSetter(webviewPanel.webview);
+
+      return webviewPanel;
+    };
+  }
+
+  // Method theia.Webview#asWebviewUri is being called from theia container.
+  // In default flow method returns the path like: /webview/theia-resource/file:///path/to/directory
+  // with https scheme and authority
+  private rebind$asWebviewUri(webview: theia.Webview): void {
+    const original$asWebviewUri = webview.asWebviewUri.bind(webview);
+    webview.asWebviewUri = (resource: Uri) => original$asWebviewUri(overrideUri(resource));
+  }
+
+  // Browser part perform preprocess initial html content by replacing vscode-resource:/path/to/file
+  // to https://authority/webview/theia-resource/file/path/to/file. To be able to operate with custom
+  // provided scheme, we can perform replacing the initial html by appending remote sidecar scheme, so
+  // we will get links look like vscode-resource://scheme/path/to/file. Webview.html organized via
+  // getter and setter, so we cant really bind method, instead of this, we redefine setter property.
+  // We need to leave backward compatibility with vscode resources that loads remotely.
+  private rebind$_htmlSetter(webview: theia.Webview): void {
+    Object.defineProperty(webview, '_html', {
+      get: function () {
+        // @ts-ignore
+        return this._html;
+      }.bind(this),
+      set: function (value: string) {
+        const sideCarScheme = `file-sidecar-${process.env.CHE_MACHINE_NAME}`;
+        // @ts-ignore
+        this._html = value.replace(
+          /(["'])(vscode|theia)-resource:(\/\/([^\s\/'"]+?)(?=\/))?([^\s'"]+?)(["'])/gi,
+          (_, startQuote, resourceType, _1, scheme, path, endQuote) => {
+            if (scheme) {
+              return _;
+            }
+            return `${startQuote}${resourceType}-resource://${sideCarScheme}${path}${endQuote}`;
+          }
+        );
+      }.bind(this),
+    });
+  }
+}