refactor(tapops): modularize page code

groups/Tapops/js/viewer/viewer-api.js

@@ -0,0 +1,31 @@
+export class ViewerApi {
+    static API_BASE = 'https://api.ifuntanhub.dev';
+
+    static assetUrl(uuid) {
+        return `${this.API_BASE}/assets/${uuid}`;
+    }
+
+    static async fetchBlob(url, onProgress) {
+        const response = await fetch(url);
+        if (!response.ok) throw new Error(`Gagal mengambil berkas (HTTP ${response.status}).`);
+
+        const contentLength = response.headers.get('Content-Length');
+        if (onProgress && contentLength && response.body) {
+            const total = Number.parseInt(contentLength, 10);
+            const reader = response.body.getReader();
+            const chunks = [];
+            let received = 0;
+
+            while (true) {
+                const { done, value } = await reader.read();
+                if (done) break;
+                chunks.push(value);
+                received += value.length;
+                onProgress(received / total);
+            }
+            return new Blob(chunks);
+        }
+
+        return response.blob();
+    }
+}