feat: AI writing history, Word export, roundtable dispatch chain

frontend-web/src/core/api/markdown-docx-export.ts

@@ -0,0 +1,93 @@
+import { apiFetch } from "@/core/api/fetch-client";
+import { getBackendBaseURL } from "@/core/config";
+import { downloadMarkdownAsDocx } from "@/core/scheduled-tasks/markdown-docx";
+
+function filenameFromContentDisposition(header: string | null): string | null {
+  if (!header) return null;
+  const star = /filename\*=(?:UTF-8'')?([^;]+)/i.exec(header);
+  if (star) {
+    const raw = star[1].replace(/["']/g, "").trim();
+    try {
+      return decodeURIComponent(raw);
+    } catch {
+      return raw;
+    }
+  }
+  const plain = /filename="?([^";\n]+)"?/i.exec(header);
+  return plain ? plain[1].trim() : null;
+}
+
+function sanitizeFallbackFilename(title: string | undefined): string {
+  const base = (title?.trim() || "document").replace(/[<>:"/\\|?*\x00-\x1f]+/g, "_");
+  return base.toLowerCase().endsWith(".docx") ? base : `${base}.docx`;
+}
+
+async function downloadBlobResponse(response: Response, fallbackFilename: string) {
+  if (!response.ok) {
+    const error = await response
+      .json()
+      .catch(() => ({ detail: "导出 Word 失败" }));
+    const detail = error.detail;
+    if (typeof detail === "string") throw new Error(detail);
+    throw new Error("导出 Word 失败");
+  }
+
+  const blob = await response.blob();
+  const filename =
+    filenameFromContentDisposition(response.headers.get("Content-Disposition")) ??
+    fallbackFilename;
+  const url = URL.createObjectURL(blob);
+  const anchor = document.createElement("a");
+  anchor.href = url;
+  anchor.download = filename;
+  anchor.rel = "noopener";
+  document.body.appendChild(anchor);
+  anchor.click();
+  anchor.remove();
+  window.setTimeout(() => URL.revokeObjectURL(url), 30_000);
+}
+
+/**
+ * 通用 Markdown → Word 导出（Gateway `writing` 路由，与 `/api/writing/rewrite` 同级）。
+ *
+ *   POST /api/writing/export/docx
+ *   Body: { title?: string, markdown: string }
+ *
+ * 返回 `application/vnd.openxmlformats-officedocument.wordprocessingml.document`，
+ * 文件名在 `Content-Disposition` 中。
+ */
+export async function downloadMarkdownDocxFromBackend(options: {
+  title?: string;
+  markdown: string;
+}): Promise<void> {
+  const markdown = options.markdown.trim();
+  if (!markdown) {
+    throw new Error("文档内容为空");
+  }
+
+  const fallbackFilename = sanitizeFallbackFilename(options.title);
+
+  try {
+    const response = await apiFetch(`${getBackendBaseURL()}/api/writing/export/docx`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        title: options.title?.trim() || undefined,
+        markdown,
+      }),
+    });
+
+    if (response.status === 404) {
+      await downloadMarkdownAsDocx(markdown, options.title?.trim() || "document", options.title);
+      return;
+    }
+
+    await downloadBlobResponse(response, fallbackFilename);
+  } catch (err) {
+    if (err instanceof TypeError) {
+      await downloadMarkdownAsDocx(markdown, options.title?.trim() || "document", options.title);
+      return;
+    }
+    throw err;
+  }
+}