Speed up artifact downloads

platform_web/utils/serverFileTransfer.ts

@@ -1,72 +1,18 @@
 import type { PlatformApiClient } from "../api/client";
 import type { ServerFileDownloadResponse } from "../api/types";
+import { downloadArtifactReference, safeArtifactFilename, saveArtifactBlob } from "./artifactTransfer";
 
 export async function downloadServerFileResult(client: PlatformApiClient, result: ServerFileDownloadResponse): Promise<string> {
   if (result.status !== "ready") {
     return result.reason ?? "文件读取任务已派发，完成后可再次下载。";
   }
   if (result.content !== undefined) {
-    saveBlob(new Blob([result.content], { type: result.contentType ?? "text/plain;charset=utf-8" }), result.filename || "server-file.txt");
+    saveArtifactBlob(new Blob([result.content], { type: result.contentType ?? "text/plain;charset=utf-8" }), result.filename || "server-file.txt");
     return `下载已开始：${result.filename || result.key}`;
   }
   if (!result.artifact) {
     return "文件内容尚未可用。";
   }
-  const writer = await createFileWriter(result.filename || result.artifact.filename);
-  let offset = 0;
-  const chunkSize = Math.max(1, result.artifact.chunkSizeBytes || 1024 * 1024);
-  try {
-    while (offset < result.artifact.sizeBytes) {
-      const chunk = await client.readArtifactContent(result.artifact.artifactId, offset, Math.min(chunkSize, result.artifact.sizeBytes - offset));
-      if (chunk.contentLength <= 0) throw new Error("文件下载返回空数据");
-      await writer.write(chunk.payload);
-      offset += chunk.contentLength;
-    }
-    await writer.close();
-  } catch (error) {
-    await writer.abort();
-    throw error;
-  }
-  return `下载已开始：${result.filename || result.artifact.filename}`;
-}
-
-interface FileWriter {
-  write(data: ArrayBuffer): Promise<void>;
-  close(): Promise<void>;
-  abort(): Promise<void>;
-}
-
-async function createFileWriter(filename: string): Promise<FileWriter> {
-  const picker = (window as Window & { showSaveFilePicker?: (options?: { suggestedName?: string }) => Promise<{ createWritable(): Promise<FileSystemWritableFileStream> }> }).showSaveFilePicker;
-  if (picker) {
-    const handle = await picker({ suggestedName: safeFilename(filename) });
-    const writable = await handle.createWritable();
-    return {
-      write: async (data) => { await writable.write(data); },
-      close: async () => { await writable.close(); },
-      abort: async () => { await writable.abort(); }
-    };
-  }
-  const chunks: ArrayBuffer[] = [];
-  return {
-    write: async (data) => { chunks.push(data); },
-    close: async () => { saveBlob(new Blob(chunks, { type: "application/octet-stream" }), safeFilename(filename)); },
-    abort: async () => { chunks.length = 0; }
-  };
-}
-
-function saveBlob(blob: Blob, filename: string) {
-  const url = URL.createObjectURL(blob);
-  const anchor = document.createElement("a");
-  anchor.href = url;
-  anchor.download = safeFilename(filename);
-  document.body.appendChild(anchor);
-  anchor.click();
-  anchor.remove();
-  window.setTimeout(() => URL.revokeObjectURL(url), 1000);
-}
-
-function safeFilename(filename: string): string {
-  const cleaned = filename.replace(/[\\/:*?"<>|]+/g, "-").trim();
-  return cleaned || "server-file.txt";
+  await downloadArtifactReference(result.artifact, (artifactId) => client.downloadArtifactContent(artifactId));
+  return `下载已开始：${safeArtifactFilename(result.filename || result.artifact.filename)}`;
 }