update image thumb

src/utils/attachment.ts

@@ -0,0 +1,21 @@
+import { AttachmentAPI } from "timi-web";
+
+/**
+ * 获取附件读取地址。
+ *
+ * @param id 附件 ID
+ * @param thumbnailSize 缩略图尺寸，不传时返回原图地址
+ */
+export function getAttachmentReadURL(id: string, thumbnailSize?: number): string {
+	const url = AttachmentAPI.getReadURL(id);
+	if (thumbnailSize === undefined) {
+		return url;
+	}
+
+	const params = new URLSearchParams({
+		thumbWidth: String(thumbnailSize),
+		thumbHeight: String(thumbnailSize)
+	});
+	const separator = url.includes("?") ? "&" : "?";
+	return `${url}${separator}${params.toString()}`;
+}