feat(core): add blocksuite writer info service (#10754)

blocksuite/affine/shared/src/services/user-service/index.ts

@@ -1,3 +1,4 @@
 export * from './types';
 export * from './user-list-service';
 export * from './user-service';
+export * from './writer-info-service';

blocksuite/affine/shared/src/services/user-service/user-service.ts

@@ -5,7 +5,6 @@ import type { Signal } from '@preact/signals-core';
 import type { AffineUserInfo } from './types';
 
 export interface UserService {
-  getCurrentUser(): AffineUserInfo | null;
   userInfo$(id: string): Signal<AffineUserInfo | null>;
   revalidateUserInfo(id: string): void;
 }

blocksuite/affine/shared/src/services/user-service/writer-info-service.ts

@@ -0,0 +1,22 @@
+import { createIdentifier } from '@blocksuite/global/di';
+import type { ExtensionType } from '@blocksuite/store';
+
+import type { AffineUserInfo } from './types';
+
+export interface WriterInfoService {
+  getWriterInfo(): AffineUserInfo | null;
+}
+
+export const WriterInfoProvider = createIdentifier<WriterInfoService>(
+  'affine-writer-info-service'
+);
+
+export function WriterInfoServiceExtension(
+  service: WriterInfoService
+): ExtensionType {
+  return {
+    setup(di) {
+      di.addImpl(WriterInfoProvider, () => service);
+    },
+  };
+}