fix(core): Normalize binary data handling across registries and add buffer helpers

ts/composer/classes.composerregistry.ts

@@ -7,6 +7,7 @@ import { BaseRegistry } from '../core/classes.baseregistry.js';
 import type { RegistryStorage } from '../core/classes.registrystorage.js';
 import type { AuthManager } from '../core/classes.authmanager.js';
 import type { IRequestContext, IResponse, IAuthToken } from '../core/interfaces.core.js';
+import { isBinaryData, toBuffer } from '../core/helpers.buffer.js';
 import type {
   IComposerPackage,
   IComposerPackageMetadata,
@@ -255,7 +256,7 @@ export class ComposerRegistry extends BaseRegistry {
       };
     }
 
-    if (!body || !Buffer.isBuffer(body)) {
+    if (!body || !isBinaryData(body)) {
       return {
         status: 400,
         headers: {},
@@ -263,8 +264,11 @@ export class ComposerRegistry extends BaseRegistry {
       };
     }
 
+    // Convert to Buffer for ZIP processing
+    const zipData = toBuffer(body);
+
     // Extract and validate composer.json from ZIP
-    const composerJson = await extractComposerJsonFromZip(body);
+    const composerJson = await extractComposerJsonFromZip(zipData);
     if (!composerJson || !validateComposerJson(composerJson)) {
       return {
         status: 400,
@@ -292,13 +296,13 @@ export class ComposerRegistry extends BaseRegistry {
     }
 
     // Calculate SHA-1 hash
-    const shasum = await calculateSha1(body);
+    const shasum = await calculateSha1(zipData);
 
     // Generate reference (use version or commit hash)
     const reference = composerJson.source?.reference || version.replace(/[^a-zA-Z0-9.-]/g, '-');
 
     // Store ZIP file
-    await this.storage.putComposerPackageZip(vendorPackage, reference, body);
+    await this.storage.putComposerPackageZip(vendorPackage, reference, zipData);
 
     // Get or create metadata
     let metadata = await this.storage.getComposerPackageMetadata(vendorPackage);