update nextcloud for file support

frontend/src/services/nextcloud.ts

@@ -68,4 +68,32 @@ export const nextcloudApi = {
       .post(`/api/nextcloud/talk/rooms/${encodeURIComponent(token)}/read`)
       .then(() => undefined);
   },
+
+  uploadFile(
+    token: string,
+    file: File,
+    onProgress?: (pct: number) => void,
+  ): Promise<void> {
+    const formData = new FormData();
+    formData.append('file', file);
+    return api
+      .post(`/api/nextcloud/talk/rooms/${encodeURIComponent(token)}/files`, formData, {
+        headers: { 'Content-Type': 'multipart/form-data' },
+        onUploadProgress: onProgress
+          ? (e) => {
+              if (e.total) onProgress(Math.round((e.loaded / e.total) * 100));
+            }
+          : undefined,
+      })
+      .then(() => undefined);
+  },
+
+  getFileDownloadUrl(fileId: number | string, filePath?: string): string {
+    const base = `/api/nextcloud/talk/files/${fileId}/download`;
+    return filePath ? `${base}?path=${encodeURIComponent(filePath)}` : base;
+  },
+
+  getFilePreviewUrl(fileId: number | string, w = 400, h = 400): string {
+    return `/api/nextcloud/talk/files/${fileId}/preview?w=${w}&h=${h}`;
+  },
 };