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app/lib/minio/client.ts

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+/**
+ * MinIO 客户端封装 - 上传、下载等操作
+ * 通过 getMinioConfig() 获取配置，支持主题覆盖
+ */
+
+import * as Minio from "minio";
+import { getMinioConfig } from "./config";
+import { getThemeConfig } from "@/config/site.config";
+
+/** 获取 MinIO 客户端实例（使用主题配置） */
+export function getMinioClient(): Minio.Client {
+  const theme = getThemeConfig();
+  const cfg = getMinioConfig(theme.services?.minio);
+
+  return new Minio.Client({
+    endPoint: cfg.endPoint,
+    port: cfg.port,
+    useSSL: cfg.useSSL,
+    accessKey: cfg.accessKey,
+    secretKey: cfg.secretKey,
+    pathStyle: true,
+    region: cfg.region,
+  });
+}
+
+export interface UploadResult {
+  url: string;
+  objectKey: string;
+}
+
+/**
+ * 上传文件到 MinIO
+ * @param buffer 文件内容
+ * @param objectKey 对象键（含路径，如 joins/xxx.jpg）
+ * @param contentType MIME 类型
+ */
+export async function uploadBuffer(
+  buffer: Buffer,
+  objectKey: string,
+  contentType: string = "application/octet-stream"
+): Promise<UploadResult> {
+  const theme = getThemeConfig();
+  const cfg = getMinioConfig(theme.services?.minio);
+
+  if (!cfg.enabled) {
+    throw new Error("MinIO 存储未启用");
+  }
+
+  const client = getMinioClient();
+  await client.putObject(cfg.bucket, objectKey, buffer, buffer.length, {
+    "Content-Type": contentType,
+  });
+
+  const url = `${cfg.publicUrl}/${objectKey}`;
+  return { url, objectKey };
+}
+
+/**
+ * 生成上传用的对象键
+ * @param ext 文件扩展名
+ */
+export function generateObjectKey(ext: string): string {
+  const theme = getThemeConfig();
+  const cfg = getMinioConfig(theme.services?.minio);
+  const prefix = cfg.uploadPrefix.replace(/\/$/, "");
+  return `${prefix}/${Date.now()}_${Math.random().toString(36).slice(2)}.${ext}`;
+}