refactor: filetype 识别

src/core/helper/msg.ts

@@ -0,0 +1,14 @@
+import * as fileType from 'file-type';
+import { PicType } from '../types';
+export async function getFileTypeForSendType(picPath: string): Promise<PicType> {
+    const fileTypeResult = (await fileType.fileTypeFromFile(picPath))?.ext ?? 'jpg';
+    const picTypeMap: { [key: string]: PicType } = {
+        'webp': PicType.NEWPIC_WEBP,
+        'gif': PicType.NEWPIC_GIF,
+        'png': PicType.NEWPIC_APNG,
+        'jpg': PicType.NEWPIC_JPEG,
+        'jpeg': PicType.NEWPIC_JPEG,
+        'bmp': PicType.NEWPIC_BMP,
+    };
+    return picTypeMap[fileTypeResult] ?? PicType.NEWPIC_JPEG;
+}