Updaed graphql api with ResolveField for download URL

src/cases/cases.resolver.ts

@@ -4,11 +4,13 @@ import type { FileUpload } from 'graphql-upload-ts';
 import { CasesService } from './cases.service';
 import { CaseLaw } from './entities/case-law.entity';
 import { CaseFileValidationPipe } from 'src/common/pipes/file-validation.pipe';
+import { StorageService } from 'src/common/storage/storage.service';
 
 @Resolver(() => CaseLaw)
 export class CasesResolver {
   constructor(
     private readonly casesService: CasesService,
+    private readonly storage: StorageService,
   ) {}
 
 
@@ -20,6 +22,14 @@ export class CasesResolver {
     return this.casesService.findOne(id, caseNumber);
   }
 
+  @ResolveField(() => String, { name: 'downloadUrl', nullable: true })
+  async getDownloadUrl(@Parent() caseLaw: CaseLaw): Promise<string | null> {
+    const key = caseLaw.storageKey;
+    if (!key) return null;
+    
+    return this.storage.getPresignedUrl(key);
+  }
+
   @Mutation(() => CaseLaw)
   async uploadCase(
     @Args({ name: 'file', type: () => GraphQLUpload }, CaseFileValidationPipe)