fix(server): use new LocalWorkspace ServerFeature instead (#13091)

keep compatibility

close AF-2720



#### PR Dependency Tree


* **PR #13091** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

## Summary by CodeRabbit

* **New Features**
* Added a new `LocalWorkspace` feature flag to server configuration,
enabling more flexible feature management.

* **Deprecations**
* The `allowGuestDemoWorkspace` flag is now deprecated and will be
removed in version 0.25.0. Please use the `features` array for feature
checks instead.

* **Bug Fixes**
* Updated UI and logic throughout the app to rely on the new
`LocalWorkspace` feature flag rather than the deprecated boolean flag.

* **Chores**
* Removed references to `allowGuestDemoWorkspace` from configuration,
queries, and type definitions for improved consistency.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


#### PR Dependency Tree


* **PR #13091** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

packages/backend/server/src/core/config/resolver.ts

@@ -85,6 +85,7 @@ export class ServerConfigResolver {
       baseUrl: this.url.requestBaseUrl,
       type: env.DEPLOYMENT_TYPE,
       features: this.server.features,
+      // TODO(@fengmk2): remove this field after the feature 0.25.0 is released
       allowGuestDemoWorkspace: this.config.flags.allowGuestDemoWorkspace,
     };
   }

packages/backend/server/src/core/config/service.ts

@@ -110,6 +110,13 @@ export class ServerService implements OnApplicationBootstrap {
     this.event.emit('config.changed', event);
   }
 
+  @OnEvent('config.changed')
+  onConfigChanged(event: Events['config.changed']) {
+    if ('flags' in event.updates) {
+      this.onFlagsChanged();
+    }
+  }
+
   async revalidateConfig() {
     const overrides = await this.loadDbOverrides();
     this.configFactory.override(overrides);
@@ -122,6 +129,7 @@ export class ServerService implements OnApplicationBootstrap {
     await this.event.emitAsync('config.init', {
       config: this.configFactory.config,
     });
+    this.onFlagsChanged();
   }
 
   private async loadDbOverrides() {
@@ -134,4 +142,13 @@ export class ServerService implements OnApplicationBootstrap {
 
     return overrides;
   }
+
+  private onFlagsChanged() {
+    const flags = this.configFactory.config.flags;
+    if (flags.allowGuestDemoWorkspace) {
+      this.enableFeature(ServerFeature.LocalWorkspace);
+    } else {
+      this.disableFeature(ServerFeature.LocalWorkspace);
+    }
+  }
 }

packages/backend/server/src/core/config/types.ts

@@ -10,6 +10,7 @@ export enum ServerFeature {
   OAuth = 'oauth',
   Indexer = 'indexer',
   Comment = 'comment',
+  LocalWorkspace = 'local_workspace',
 }
 
 registerEnumType(ServerFeature, {
@@ -42,6 +43,8 @@ export class ServerConfigType {
 
   @Field(() => Boolean, {
     description: 'Whether allow guest users to create demo workspaces.',
+    deprecationReason:
+      'This field is deprecated, please use `features` instead. Will be removed in 0.25.0',
   })
   allowGuestDemoWorkspace!: boolean;
 }