feat: implement readonly capabilities

src/bidiMapper/CommandProcessor.ts

@@ -133,7 +133,10 @@ export class CommandProcessor extends EventEmitter<CommandProcessorEventsMap> {
       preloadScriptStorage,
       logger
     );
-    this.#sessionProcessor = new SessionProcessor(eventManager);
+    this.#sessionProcessor = new SessionProcessor(
+      eventManager,
+      browserCdpClient
+    );
     this.#storageProcessor = new StorageProcessor(
       browserCdpClient,
       browsingContextStorage,
@@ -147,7 +150,6 @@ export class CommandProcessor extends EventEmitter<CommandProcessorEventsMap> {
   ): Promise<ChromiumBidi.ResultData> {
     switch (command.method) {
       case 'session.end':
-      case 'session.new':
         // TODO: Implement.
         break;
 
@@ -325,6 +327,8 @@ export class CommandProcessor extends EventEmitter<CommandProcessorEventsMap> {
 
       // Session domain
       // keep-sorted start block=yes
+      case 'session.new':
+        return await this.#sessionProcessor.create(command.params);
       case 'session.status':
         return this.#sessionProcessor.status();
       case 'session.subscribe':

src/bidiMapper/domains/session/SessionProcessor.ts

@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+import type {CdpClient} from '../../../cdp/CdpClient.js';
 import type {BidiPlusChannel} from '../../../protocol/chromium-bidi.js';
 import type {
   ChromiumBidi,
@@ -26,15 +27,38 @@ import type {EventManager} from './EventManager.js';
 
 export class SessionProcessor {
   #eventManager: EventManager;
+  #browserCdpClient: CdpClient;
 
-  constructor(eventManager: EventManager) {
+  constructor(eventManager: EventManager, browserCdpClient: CdpClient) {
     this.#eventManager = eventManager;
+    this.#browserCdpClient = browserCdpClient;
   }
 
   status(): Session.StatusResult {
     return {ready: false, message: 'already connected'};
   }
 
+  async create(_params: Session.NewParameters): Promise<Session.NewResult> {
+    // Since mapper exists, there is a session already.
+    // Still the mapper can handle capabilities for us.
+    // Currently, only Puppeteer calls here but, eventually, every client
+    // should delegrate capability processing here.
+    const version =
+      await this.#browserCdpClient.sendCommand('Browser.getVersion');
+    return {
+      sessionId: 'unknown',
+      capabilities: {
+        acceptInsecureCerts: false,
+        browserName: version.product,
+        browserVersion: version.revision,
+        platformName: '',
+        setWindowRect: false,
+        webSocketUrl: '',
+        userAgent: version.userAgent,
+      },
+    };
+  }
+
   async subscribe(
     params: Session.SubscriptionRequest,
     channel: BidiPlusChannel = null