feat: 添加富媒体消息和图床支持

src/api.ts

@@ -213,3 +213,161 @@ export async function sendProactiveGroupMessage(
     msg_type: 0,
   });
 }
+
+// ============ 富媒体消息支持 ============
+
+/**
+ * 媒体文件类型
+ */
+export enum MediaFileType {
+  IMAGE = 1,
+  VIDEO = 2,
+  VOICE = 3,
+  FILE = 4, // 暂未开放
+}
+
+/**
+ * 上传富媒体文件的响应
+ */
+export interface UploadMediaResponse {
+  file_uuid: string;
+  file_info: string;
+  ttl: number;
+  id?: string; // 仅当 srv_send_msg=true 时返回
+}
+
+/**
+ * 上传富媒体文件到 C2C 单聊
+ * @param accessToken 访问令牌
+ * @param openid 用户 openid
+ * @param fileType 文件类型
+ * @param url 媒体资源 URL
+ * @param srvSendMsg 是否直接发送（推荐 false，获取 file_info 后再发送）
+ */
+export async function uploadC2CMedia(
+  accessToken: string,
+  openid: string,
+  fileType: MediaFileType,
+  url: string,
+  srvSendMsg = false
+): Promise<UploadMediaResponse> {
+  return apiRequest(accessToken, "POST", `/v2/users/${openid}/files`, {
+    file_type: fileType,
+    url,
+    srv_send_msg: srvSendMsg,
+  });
+}
+
+/**
+ * 上传富媒体文件到群聊
+ * @param accessToken 访问令牌
+ * @param groupOpenid 群 openid
+ * @param fileType 文件类型
+ * @param url 媒体资源 URL
+ * @param srvSendMsg 是否直接发送（推荐 false，获取 file_info 后再发送）
+ */
+export async function uploadGroupMedia(
+  accessToken: string,
+  groupOpenid: string,
+  fileType: MediaFileType,
+  url: string,
+  srvSendMsg = false
+): Promise<UploadMediaResponse> {
+  return apiRequest(accessToken, "POST", `/v2/groups/${groupOpenid}/files`, {
+    file_type: fileType,
+    url,
+    srv_send_msg: srvSendMsg,
+  });
+}
+
+/**
+ * 发送 C2C 单聊富媒体消息
+ * @param accessToken 访问令牌
+ * @param openid 用户 openid
+ * @param fileInfo 从 uploadC2CMedia 获取的 file_info
+ * @param msgId 被动回复时需要的消息 ID
+ * @param content 可选的文字内容
+ */
+export async function sendC2CMediaMessage(
+  accessToken: string,
+  openid: string,
+  fileInfo: string,
+  msgId?: string,
+  content?: string
+): Promise<{ id: string; timestamp: number }> {
+  const msgSeq = msgId ? getNextMsgSeq(msgId) : 1;
+  return apiRequest(accessToken, "POST", `/v2/users/${openid}/messages`, {
+    msg_type: 7, // 富媒体消息类型
+    media: { file_info: fileInfo },
+    msg_seq: msgSeq,
+    ...(content ? { content } : {}),
+    ...(msgId ? { msg_id: msgId } : {}),
+  });
+}
+
+/**
+ * 发送群聊富媒体消息
+ * @param accessToken 访问令牌
+ * @param groupOpenid 群 openid
+ * @param fileInfo 从 uploadGroupMedia 获取的 file_info
+ * @param msgId 被动回复时需要的消息 ID
+ * @param content 可选的文字内容
+ */
+export async function sendGroupMediaMessage(
+  accessToken: string,
+  groupOpenid: string,
+  fileInfo: string,
+  msgId?: string,
+  content?: string
+): Promise<{ id: string; timestamp: string }> {
+  const msgSeq = msgId ? getNextMsgSeq(msgId) : 1;
+  return apiRequest(accessToken, "POST", `/v2/groups/${groupOpenid}/messages`, {
+    msg_type: 7, // 富媒体消息类型
+    media: { file_info: fileInfo },
+    msg_seq: msgSeq,
+    ...(content ? { content } : {}),
+    ...(msgId ? { msg_id: msgId } : {}),
+  });
+}
+
+/**
+ * 发送带图片的 C2C 单聊消息（封装上传+发送）
+ * @param accessToken 访问令牌
+ * @param openid 用户 openid
+ * @param imageUrl 图片 URL
+ * @param msgId 被动回复时需要的消息 ID
+ * @param content 可选的文字内容
+ */
+export async function sendC2CImageMessage(
+  accessToken: string,
+  openid: string,
+  imageUrl: string,
+  msgId?: string,
+  content?: string
+): Promise<{ id: string; timestamp: number }> {
+  // 先上传图片获取 file_info
+  const uploadResult = await uploadC2CMedia(accessToken, openid, MediaFileType.IMAGE, imageUrl, false);
+  // 再发送富媒体消息
+  return sendC2CMediaMessage(accessToken, openid, uploadResult.file_info, msgId, content);
+}
+
+/**
+ * 发送带图片的群聊消息（封装上传+发送）
+ * @param accessToken 访问令牌
+ * @param groupOpenid 群 openid
+ * @param imageUrl 图片 URL
+ * @param msgId 被动回复时需要的消息 ID
+ * @param content 可选的文字内容
+ */
+export async function sendGroupImageMessage(
+  accessToken: string,
+  groupOpenid: string,
+  imageUrl: string,
+  msgId?: string,
+  content?: string
+): Promise<{ id: string; timestamp: string }> {
+  // 先上传图片获取 file_info
+  const uploadResult = await uploadGroupMedia(accessToken, groupOpenid, MediaFileType.IMAGE, imageUrl, false);
+  // 再发送富媒体消息
+  return sendGroupMediaMessage(accessToken, groupOpenid, uploadResult.file_info, msgId, content);
+}

src/gateway.ts

@@ -1,7 +1,8 @@
 import WebSocket from "ws";
 import type { ResolvedQQBotAccount, WSPayload, C2CMessageEvent, GuildMessageEvent, GroupMessageEvent } from "./types.js";
-import { getAccessToken, getGatewayUrl, sendC2CMessage, sendChannelMessage, sendGroupMessage, clearTokenCache } from "./api.js";
+import { getAccessToken, getGatewayUrl, sendC2CMessage, sendChannelMessage, sendGroupMessage, clearTokenCache, sendC2CImageMessage, sendGroupImageMessage } from "./api.js";
 import { getQQBotRuntime } from "./runtime.js";
+import { startImageServer, saveImage, isImageServerRunning, type ImageServerConfig } from "./image-server.js";
 
 // QQ Bot intents
 const INTENTS = {
@@ -19,6 +20,10 @@ const MAX_RECONNECT_ATTEMPTS = 100;
 const MAX_QUICK_DISCONNECT_COUNT = 3; // 连续快速断开次数阈值
 const QUICK_DISCONNECT_THRESHOLD = 5000; // 5秒内断开视为快速断开
 
+// 图床服务器配置（可通过环境变量覆盖）
+const IMAGE_SERVER_PORT = parseInt(process.env.QQBOT_IMAGE_SERVER_PORT || "18765", 10);
+const IMAGE_SERVER_DIR = process.env.QQBOT_IMAGE_SERVER_DIR || "./qqbot-images";
+
 export interface GatewayContext {
   account: ResolvedQQBotAccount;
   abortSignal: AbortSignal;
@@ -32,6 +37,30 @@ export interface GatewayContext {
   };
 }
 
+/**
+ * 启动图床服务器
+ */
+async function ensureImageServer(log?: GatewayContext["log"]): Promise<string | null> {
+  if (isImageServerRunning()) {
+    return `http://0.0.0.0:${IMAGE_SERVER_PORT}`;
+  }
+
+  try {
+    const config: Partial<ImageServerConfig> = {
+      port: IMAGE_SERVER_PORT,
+      storageDir: IMAGE_SERVER_DIR,
+      baseUrl: `http://0.0.0.0:${IMAGE_SERVER_PORT}`,
+      ttlSeconds: 3600, // 1 小时过期
+    };
+    await startImageServer(config);
+    log?.info(`[qqbot] Image server started on port ${IMAGE_SERVER_PORT}`);
+    return `http://0.0.0.0:${IMAGE_SERVER_PORT}`;
+  } catch (err) {
+    log?.error(`[qqbot] Failed to start image server: ${err}`);
+    return null;
+  }
+}
+
 /**
  * 启动 Gateway WebSocket 连接（带自动重连）
  */
@@ -42,6 +71,9 @@ export async function startGateway(ctx: GatewayContext): Promise<void> {
     throw new Error("QQBot not configured (missing appId or clientSecret)");
   }
 
+  // 尝试启动图床服务器
+  const imageServerBaseUrl = await ensureImageServer(log);
+
   let reconnectAttempts = 0;
   let isAborted = false;
   let currentWs: WebSocket | null = null;
@@ -306,29 +338,90 @@ export async function startGateway(ctx: GatewayContext): Promise<void> {
                 let replyText = payload.text ?? "";
                 if (!replyText.trim()) return;
 
-                // 处理回复内容，避免被 QQ 识别为 URL
+                // 提取回复中的图片
-                const originalText = replyText;
+                const imageUrls: string[] = [];
                 
-                // 把所有可能被识别为 URL 的点替换为下划线
+                // 1. 提取 base64 图片（data:image/xxx;base64,...）
-                // 匹配：字母/数字.字母/数字 的模式
+                const base64ImageRegex = /!\[([^\]]*)\]\((data:image\/[^;]+;base64,[A-Za-z0-9+/=]+)\)|(?<![(\[])(data:image\/[^;]+;base64,[A-Za-z0-9+/=]+)/gi;
-                replyText = replyText.replace(/([a-zA-Z0-9])\.([a-zA-Z0-9])/g, "$1_$2");
+                const base64Matches = [...replyText.matchAll(base64ImageRegex)];
                 
-                const hasReplacement = replyText !== originalText;
+                for (const match of base64Matches) {
-                if (hasReplacement) {
+                  const dataUrl = match[2] || match[3];
-                  replyText += "\n\n（由于平台限制，回复中的部分符号已被替换）";
+                  if (dataUrl && imageServerBaseUrl) {
+                    // 将 base64 保存到本地图床
+                    try {
+                      const savedUrl = saveImage(dataUrl);
+                      imageUrls.push(savedUrl);
+                      log?.info(`[qqbot:${account.accountId}] Saved base64 image to local server`);
+                    } catch (err) {
+                      log?.error(`[qqbot:${account.accountId}] Failed to save base64 image: ${err}`);
+                    }
+                  }
+                  // 从文本中移除 base64
+                  replyText = replyText.replace(match[0], "").trim();
+                }
+
+                // 2. 提取 URL 图片（Markdown 格式或纯 URL）
+                const imageUrlRegex = /!\[([^\]]*)\]\((https?:\/\/[^\s)]+\.(?:png|jpg|jpeg|gif|webp)(?:\?[^\s)]*)?)\)|(?<![(\[])(https?:\/\/[^\s)]+\.(?:png|jpg|jpeg|gif|webp)(?:\?[^\s]*)?)/gi;
+                const urlMatches = [...replyText.matchAll(imageUrlRegex)];
+                
+                for (const match of urlMatches) {
+                  // match[2] 是 Markdown 格式的 URL，match[3] 是纯 URL
+                  const url = match[2] || match[3];
+                  if (url) {
+                    imageUrls.push(url);
+                  }
+                }
+
+                // 从文本中移除图片 URL，避免被 QQ 拦截
+                let textWithoutImages = replyText;
+                for (const match of urlMatches) {
+                  textWithoutImages = textWithoutImages.replace(match[0], "").trim();
+                }
+
+                // 处理剩余文本中的 URL 点号
+                const originalText = textWithoutImages;
+                textWithoutImages = textWithoutImages.replace(/([a-zA-Z0-9])\.([a-zA-Z0-9])/g, "$1_$2");
+                
+                const hasReplacement = textWithoutImages !== originalText;
+                if (hasReplacement && textWithoutImages.trim()) {
+                  textWithoutImages += "\n\n（由于平台限制，回复中的部分符号已被替换）";
                 }
 
                 try {
-                  await sendWithTokenRetry(async (token) => {
+                  // 先发送图片（如果有）
-                    if (event.type === "c2c") {
+                  for (const imageUrl of imageUrls) {
-                      await sendC2CMessage(token, event.senderId, replyText, event.messageId);
+                    try {
-                    } else if (event.type === "group" && event.groupOpenid) {
+                      await sendWithTokenRetry(async (token) => {
-                      await sendGroupMessage(token, event.groupOpenid, replyText, event.messageId);
+                        if (event.type === "c2c") {
-                    } else if (event.channelId) {
+                          await sendC2CImageMessage(token, event.senderId, imageUrl, event.messageId);
-                      await sendChannelMessage(token, event.channelId, replyText, event.messageId);
+                        } else if (event.type === "group" && event.groupOpenid) {
+                          await sendGroupImageMessage(token, event.groupOpenid, imageUrl, event.messageId);
+                        }
+                        // 频道消息暂不支持富媒体，跳过图片
+                      });
+                      log?.info(`[qqbot:${account.accountId}] Sent image: ${imageUrl.slice(0, 50)}...`);
+                    } catch (imgErr) {
+                      log?.error(`[qqbot:${account.accountId}] Failed to send image: ${imgErr}`);
+                      // 图片发送失败时，把 URL 加回文本（已处理过点号的版本）
+                      const safeUrl = imageUrl.replace(/([a-zA-Z0-9])\.([a-zA-Z0-9])/g, "$1_$2");
+                      textWithoutImages = `[图片: ${safeUrl}]\n${textWithoutImages}`;
                     }
-                  });
+                  }
-                  log?.info(`[qqbot:${account.accountId}] Sent reply`);
+
+                  // 再发送文本（如果有）
+                  if (textWithoutImages.trim()) {
+                    await sendWithTokenRetry(async (token) => {
+                      if (event.type === "c2c") {
+                        await sendC2CMessage(token, event.senderId, textWithoutImages, event.messageId);
+                      } else if (event.type === "group" && event.groupOpenid) {
+                        await sendGroupMessage(token, event.groupOpenid, textWithoutImages, event.messageId);
+                      } else if (event.channelId) {
+                        await sendChannelMessage(token, event.channelId, textWithoutImages, event.messageId);
+                      }
+                    });
+                    log?.info(`[qqbot:${account.accountId}] Sent text reply`);
+                  }
 
                   pluginRuntime.channel.activity.record({
                     channel: "qqbot",
@@ -538,12 +631,28 @@ export async function startGateway(ctx: GatewayContext): Promise<void> {
         log?.info(`[qqbot:${account.accountId}] WebSocket closed: ${code} ${reason.toString()}`);
         isConnecting = false; // 释放锁
         
-        // 4903 等错误码表示 session 创建失败，需要刷新 token
+        // 根据错误码处理
-        if (code === 4903 || code === 4009 || code === 4014) {
+        // 4009: 可以重新发起 resume
-          log?.info(`[qqbot:${account.accountId}] Session error (${code}), will refresh token`);
+        // 4900-4913: 内部错误，需要重新 identify
+        // 4914: 机器人已下架
+        // 4915: 机器人已封禁
+        if (code === 4914 || code === 4915) {
+          log?.error(`[qqbot:${account.accountId}] Bot is ${code === 4914 ? "offline/sandbox-only" : "banned"}. Please contact QQ platform.`);
+          cleanup();
+          // 不重连，直接退出
+          return;
+        }
+        
+        if (code === 4009) {
+          // 4009 可以尝试 resume，保留 session
+          log?.info(`[qqbot:${account.accountId}] Error 4009, will try resume`);
           shouldRefreshToken = true;
+        } else if (code >= 4900 && code <= 4913) {
+          // 4900-4913 内部错误，清除 session 重新 identify
+          log?.info(`[qqbot:${account.accountId}] Internal error (${code}), will re-identify`);
           sessionId = null;
           lastSeq = null;
+          shouldRefreshToken = true;
         }
         
         // 检测是否是快速断开（连接后很快就断了）
@@ -552,12 +661,10 @@ export async function startGateway(ctx: GatewayContext): Promise<void> {
           quickDisconnectCount++;
           log?.info(`[qqbot:${account.accountId}] Quick disconnect detected (${connectionDuration}ms), count: ${quickDisconnectCount}`);
           
-          // 如果连续快速断开超过阈值，清除 session 并等待更长时间
+          // 如果连续快速断开超过阈值，等待更长时间
           if (quickDisconnectCount >= MAX_QUICK_DISCONNECT_COUNT) {
-            log?.info(`[qqbot:${account.accountId}] Too many quick disconnects, clearing session and refreshing token`);
+            log?.error(`[qqbot:${account.accountId}] Too many quick disconnects. This may indicate a permission issue.`);
-            sessionId = null;
+            log?.error(`[qqbot:${account.accountId}] Please check: 1) AppID/Secret correct 2) Bot permissions on QQ Open Platform`);
-            lastSeq = null;
-            shouldRefreshToken = true;
             quickDisconnectCount = 0;
             cleanup();
             // 快速断开太多次，等待更长时间再重连

src/image-server.ts

@@ -0,0 +1,340 @@
+/**
+ * 本地图床服务器
+ * 提供安全的图片存储和访问服务
+ */
+
+import http from "node:http";
+import fs from "node:fs";
+import path from "node:path";
+import crypto from "node:crypto";
+
+export interface ImageServerConfig {
+  /** 监听端口 */
+  port: number;
+  /** 图片存储目录 */
+  storageDir: string;
+  /** 外部访问的基础 URL（如 http://your-server:port），留空则自动生成 */
+  baseUrl?: string;
+  /** 图片过期时间（秒），0 表示不过期 */
+  ttlSeconds?: number;
+  /** 允许的图片格式 */
+  allowedFormats?: string[];
+}
+
+interface StoredImage {
+  id: string;
+  filename: string;
+  mimeType: string;
+  createdAt: number;
+  ttl: number;
+}
+
+const DEFAULT_CONFIG: Required<ImageServerConfig> = {
+  port: 18765,
+  storageDir: "./qqbot-images",
+  baseUrl: "",
+  ttlSeconds: 3600, // 默认 1 小时过期
+  allowedFormats: ["png", "jpg", "jpeg", "gif", "webp"],
+};
+
+let serverInstance: http.Server | null = null;
+let currentConfig: Required<ImageServerConfig> = { ...DEFAULT_CONFIG };
+let imageIndex = new Map<string, StoredImage>();
+
+/**
+ * 生成安全的随机 ID
+ */
+function generateImageId(): string {
+  return crypto.randomBytes(16).toString("hex");
+}
+
+/**
+ * 验证请求路径是否安全（防止目录遍历攻击）
+ */
+function isPathSafe(requestPath: string, baseDir: string): boolean {
+  const normalizedBase = path.resolve(baseDir);
+  const normalizedPath = path.resolve(baseDir, requestPath);
+  return normalizedPath.startsWith(normalizedBase + path.sep) || normalizedPath === normalizedBase;
+}
+
+/**
+ * 获取 MIME 类型
+ */
+function getMimeType(ext: string): string {
+  const mimeTypes: Record<string, string> = {
+    png: "image/png",
+    jpg: "image/jpeg",
+    jpeg: "image/jpeg",
+    gif: "image/gif",
+    webp: "image/webp",
+  };
+  return mimeTypes[ext.toLowerCase()] || "application/octet-stream";
+}
+
+/**
+ * 从 MIME 类型获取扩展名
+ */
+function getExtFromMime(mimeType: string): string {
+  const extMap: Record<string, string> = {
+    "image/png": "png",
+    "image/jpeg": "jpg",
+    "image/gif": "gif",
+    "image/webp": "webp",
+  };
+  return extMap[mimeType] || "png";
+}
+
+/**
+ * 清理过期图片
+ */
+function cleanupExpiredImages(): void {
+  const now = Date.now();
+  const expiredIds: string[] = [];
+
+  for (const [id, image] of imageIndex) {
+    if (image.ttl > 0 && now - image.createdAt > image.ttl * 1000) {
+      expiredIds.push(id);
+    }
+  }
+
+  for (const id of expiredIds) {
+    const image = imageIndex.get(id);
+    if (image) {
+      const filePath = path.join(currentConfig.storageDir, image.filename);
+      try {
+        if (fs.existsSync(filePath)) {
+          fs.unlinkSync(filePath);
+        }
+      } catch {
+        // 忽略删除错误
+      }
+      imageIndex.delete(id);
+    }
+  }
+}
+
+/**
+ * 加载已有的图片索引
+ */
+function loadImageIndex(): void {
+  const indexPath = path.join(currentConfig.storageDir, ".index.json");
+  try {
+    if (fs.existsSync(indexPath)) {
+      const data = JSON.parse(fs.readFileSync(indexPath, "utf-8"));
+      imageIndex = new Map(Object.entries(data));
+    }
+  } catch {
+    imageIndex = new Map();
+  }
+}
+
+/**
+ * 保存图片索引
+ */
+function saveImageIndex(): void {
+  const indexPath = path.join(currentConfig.storageDir, ".index.json");
+  try {
+    const data = Object.fromEntries(imageIndex);
+    fs.writeFileSync(indexPath, JSON.stringify(data, null, 2));
+  } catch {
+    // 忽略保存错误
+  }
+}
+
+/**
+ * 处理 HTTP 请求
+ */
+function handleRequest(req: http.IncomingMessage, res: http.ServerResponse): void {
+  const url = new URL(req.url || "/", `http://localhost:${currentConfig.port}`);
+  const pathname = url.pathname;
+
+  // 设置 CORS 头（允许 QQ 服务器访问）
+  res.setHeader("Access-Control-Allow-Origin", "*");
+  res.setHeader("Access-Control-Allow-Methods", "GET, OPTIONS");
+
+  if (req.method === "OPTIONS") {
+    res.writeHead(204);
+    res.end();
+    return;
+  }
+
+  // 只允许 GET 请求访问图片
+  if (req.method !== "GET") {
+    res.writeHead(405, { "Content-Type": "text/plain" });
+    res.end("Method Not Allowed");
+    return;
+  }
+
+  // 解析图片 ID（路径格式: /images/{id}.{ext}）
+  const match = pathname.match(/^\/images\/([a-f0-9]{32})\.(\w+)$/);
+  if (!match) {
+    res.writeHead(404, { "Content-Type": "text/plain" });
+    res.end("Not Found");
+    return;
+  }
+
+  const [, imageId, requestedExt] = match;
+  const image = imageIndex.get(imageId);
+
+  if (!image) {
+    res.writeHead(404, { "Content-Type": "text/plain" });
+    res.end("Image Not Found");
+    return;
+  }
+
+  // 检查是否过期
+  if (image.ttl > 0 && Date.now() - image.createdAt > image.ttl * 1000) {
+    res.writeHead(410, { "Content-Type": "text/plain" });
+    res.end("Image Expired");
+    return;
+  }
+
+  // 安全检查：确保文件路径在存储目录内
+  const filePath = path.join(currentConfig.storageDir, image.filename);
+  if (!isPathSafe(image.filename, currentConfig.storageDir)) {
+    res.writeHead(403, { "Content-Type": "text/plain" });
+    res.end("Forbidden");
+    return;
+  }
+
+  // 读取并返回图片
+  try {
+    if (!fs.existsSync(filePath)) {
+      res.writeHead(404, { "Content-Type": "text/plain" });
+      res.end("File Not Found");
+      return;
+    }
+
+    const imageData = fs.readFileSync(filePath);
+    res.writeHead(200, {
+      "Content-Type": image.mimeType,
+      "Content-Length": imageData.length,
+      "Cache-Control": image.ttl > 0 ? `max-age=${image.ttl}` : "max-age=31536000",
+    });
+    res.end(imageData);
+  } catch (err) {
+    res.writeHead(500, { "Content-Type": "text/plain" });
+    res.end("Internal Server Error");
+  }
+}
+
+/**
+ * 启动图床服务器
+ */
+export function startImageServer(config?: Partial<ImageServerConfig>): Promise<string> {
+  return new Promise((resolve, reject) => {
+    if (serverInstance) {
+      const baseUrl = currentConfig.baseUrl || `http://localhost:${currentConfig.port}`;
+      resolve(baseUrl);
+      return;
+    }
+
+    currentConfig = { ...DEFAULT_CONFIG, ...config };
+
+    // 确保存储目录存在
+    if (!fs.existsSync(currentConfig.storageDir)) {
+      fs.mkdirSync(currentConfig.storageDir, { recursive: true });
+    }
+
+    // 加载图片索引
+    loadImageIndex();
+
+    // 启动定期清理
+    const cleanupInterval = setInterval(cleanupExpiredImages, 60000); // 每分钟清理一次
+
+    serverInstance = http.createServer(handleRequest);
+
+    serverInstance.on("error", (err) => {
+      clearInterval(cleanupInterval);
+      reject(err);
+    });
+
+    serverInstance.listen(currentConfig.port, () => {
+      const baseUrl = currentConfig.baseUrl || `http://localhost:${currentConfig.port}`;
+      resolve(baseUrl);
+    });
+  });
+}
+
+/**
+ * 停止图床服务器
+ */
+export function stopImageServer(): Promise<void> {
+  return new Promise((resolve) => {
+    if (serverInstance) {
+      serverInstance.close(() => {
+        serverInstance = null;
+        saveImageIndex();
+        resolve();
+      });
+    } else {
+      resolve();
+    }
+  });
+}
+
+/**
+ * 保存图片并返回访问 URL
+ * @param imageData 图片数据（Buffer 或 base64 字符串）
+ * @param mimeType 图片 MIME 类型
+ * @param ttlSeconds 过期时间（秒），默认使用配置值
+ * @returns 图片访问 URL
+ */
+export function saveImage(
+  imageData: Buffer | string,
+  mimeType: string = "image/png",
+  ttlSeconds?: number
+): string {
+  // 转换 base64 为 Buffer
+  let buffer: Buffer;
+  if (typeof imageData === "string") {
+    // 处理 data URL 格式
+    const base64Match = imageData.match(/^data:([^;]+);base64,(.+)$/);
+    if (base64Match) {
+      mimeType = base64Match[1];
+      buffer = Buffer.from(base64Match[2], "base64");
+    } else {
+      buffer = Buffer.from(imageData, "base64");
+    }
+  } else {
+    buffer = imageData;
+  }
+
+  // 生成唯一 ID 和文件名
+  const imageId = generateImageId();
+  const ext = getExtFromMime(mimeType);
+  const filename = `${imageId}.${ext}`;
+
+  // 保存文件
+  const filePath = path.join(currentConfig.storageDir, filename);
+  fs.writeFileSync(filePath, buffer);
+
+  // 记录到索引
+  const image: StoredImage = {
+    id: imageId,
+    filename,
+    mimeType,
+    createdAt: Date.now(),
+    ttl: ttlSeconds ?? currentConfig.ttlSeconds,
+  };
+  imageIndex.set(imageId, image);
+  saveImageIndex();
+
+  // 返回访问 URL
+  const baseUrl = currentConfig.baseUrl || `http://localhost:${currentConfig.port}`;
+  return `${baseUrl}/images/${imageId}.${ext}`;
+}
+
+/**
+ * 检查图床服务器是否运行中
+ */
+export function isImageServerRunning(): boolean {
+  return serverInstance !== null;
+}
+
+/**
+ * 获取图床服务器配置
+ */
+export function getImageServerConfig(): Required<ImageServerConfig> {
+  return { ...currentConfig };
+}