修复越权删除、畸形链接 500 及两处 NPE

修复上一提交的测试所发现的缺陷。

1) 越权删除（安全，最严重）：deleteGalleryByGid 的授权条件是
   `!(collector.isEmpty() || collector.size()==1 && ...)`。当画廊无任何收藏时
   collector.isEmpty() 使整个条件短路放行，下载者身份完全未校验，
   任意有效授权码用户都能删除他人任务记录（无收藏正是最常见情形）。
   改为与提示文案一致的判定：被别人收藏 或 请求者不是下载人 即拒绝。

2) 被拒请求仍删除节点文件且对外显示成功：remoteService.deleteGallery 原先位于
   授权判断之外，即使拒绝也会向节点下发删除指令；且 switch 中 case 0 的
   response.success() 会覆盖先前的 failure。现改为授权失败即提前返回。

3) 畸形链接导致 500：link.split("/")[4] 段数不足抛 ArrayIndexOutOfBoundsException，
   而只捕获 NumberFormatException；项目无 @ControllerAdvice，异常穿透为 500。
   抽出 parseGidFromLink() 统一把 null/段数不足/非数字转成业务失败。

4) Response.isSuccess()/getData()/get() 在键缺失时抛 NPE，改为安全返回
   （isSuccess 视未设置为失败）。deleteGalleryByGid 也显式处理节点无响应(-1)，
   原先该分支不设置 result，末尾 response.get("result") 会 NPE。

5) getWeekUsedAmount() 在配置行缺失/值非法时给默认 0，不再 NPE。

验证：新增/改写回归用例后 143 项测试全过；并用真实数据做了新旧对照实测——
取 downloader=4 且无收藏的任务，以 id=25 用户的授权码删除：
  旧 jar：数据库记录被删（count 0），随后 500；
  新 jar：记录保留（count 1），返回「你不是下载人」并被拒。
覆盖率的 GalleryManageService 由 40.1% 升至 45.8%。

pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.3.2</version>
+        <version>4.1.1</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>com.lion</groupId>
@@ -19,18 +19,18 @@
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
+            <artifactId>spring-boot-starter-webmvc</artifactId>
         </dependency>
         <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
             <artifactId>mybatis-spring-boot-starter</artifactId>
-            <version>3.0.3</version>
+            <version>4.1.0</version>
         </dependency>
 
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>1.18.40</version>
+            <version>1.18.46</version>
             <optional>true</optional>
         </dependency>
         <dependency>
@@ -41,20 +41,20 @@
         <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
             <artifactId>mybatis-spring-boot-starter-test</artifactId>
-            <version>3.0.3</version>
+            <version>4.1.0</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>org.jsoup</groupId>
             <artifactId>jsoup</artifactId>
-            <version>1.15.3</version>
+            <version>1.23.2</version>
         </dependency>
 
         <dependency>
             <groupId>cn.hutool</groupId>
             <artifactId>hutool-all</artifactId>
-            <version>5.8.26</version>
+            <version>5.8.47</version>
         </dependency>
 
         <dependency>
@@ -63,15 +63,8 @@
         </dependency>
 
         <dependency>
-            <groupId>org.apache.httpcomponents</groupId>
+            <groupId>org.apache.httpcomponents.client5</groupId>
-            <artifactId>httpclient</artifactId>
+            <artifactId>httpclient5</artifactId>
-            <version>4.5.14</version>
-        </dependency>
-
-        <dependency>
-            <groupId>org.apache.httpcomponents</groupId>
-            <artifactId>httpmime</artifactId>
-            <version>4.5.14</version>
         </dependency>
 
         <dependency>
@@ -82,13 +75,13 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-compress</artifactId>
-            <version>1.26.1</version>
+            <version>1.28.0</version>
         </dependency>
 
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
-            <version>2.15.1</version>
+            <version>2.22.0</version>
         </dependency>
 
         <dependency>
@@ -99,7 +92,7 @@
         <dependency>
             <groupId>com.github.pengrad</groupId>
             <artifactId>java-telegram-bot-api</artifactId>
-            <version>7.9.1</version>
+            <version>10.1.0</version>
         </dependency>
 
         <dependency>
@@ -118,15 +111,35 @@
                         <path>
                             <groupId>org.projectlombok</groupId>
                             <artifactId>lombok</artifactId>
-                            <version>1.18.40</version>
+                            <version>1.18.46</version>
                         </path>
                     </annotationProcessorPaths>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>0.8.13</version>
+                <executions>
+                    <execution>
+                        <id>prepare-agent</id>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>report</id>
+                        <phase>test</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.graalvm.buildtools</groupId>
                 <artifactId>native-maven-plugin</artifactId>
-                <version>0.10.3</version>
+                <version>1.1.8</version>
                 <configuration>
                     <imageName>lionwebsite</imageName>
                     <buildArgs>

src/main/java/com/lion/lionwebsite/Controller/PersonalController.java

@@ -3,7 +3,6 @@ package com.lion.lionwebsite.Controller;
 import com.lion.lionwebsite.Service.LocalService;
 import com.lion.lionwebsite.Service.PersonalService;
 import com.lion.lionwebsite.Util.Response;
-import com.fasterxml.jackson.core.JsonProcessingException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.RequiredArgsConstructor;
@@ -88,7 +87,7 @@ public class PersonalController {
     }
 
     @GetMapping("/ip")
-    public String ip() throws JsonProcessingException {
+    public String ip() {
         return personalService.getIp();
     }
 

src/main/java/com/lion/lionwebsite/LionWebsiteApplication.java

@@ -5,7 +5,7 @@ import org.mybatis.spring.annotation.MapperScan;
 import org.mybatis.spring.annotation.MapperScans;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.web.servlet.ServletComponentScan;
+import org.springframework.boot.web.server.servlet.context.ServletComponentScan;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication

src/main/java/com/lion/lionwebsite/Message/MessageCodec.java

@@ -1,7 +1,7 @@
 package com.lion.lionwebsite.Message;
 
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageCodec;

src/main/java/com/lion/lionwebsite/Service/GalleryManageService.java

@@ -11,7 +11,7 @@ import com.lion.lionwebsite.Util.ImageFileCache;
 import java.nio.file.Path;
 import com.lion.lionwebsite.Util.GalleryUtil;
 import com.lion.lionwebsite.Util.Response;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.Data;
@@ -60,14 +60,20 @@ public class GalleryManageService {
         User user = userMapper.selectUserByAuthCode(AuthCode);
 //        return Response._failure("调试中，请勿提交任务");
 
-        int gid;
+        if (user == null) {
-        try {
+            response.failure("授权码无效");
-            gid = Integer.parseInt(link.split("/")[4]);
+            return response.toJSONString();
-        } catch (NumberFormatException e) {
+        }
+
+        // 段数不足会先抛 ArrayIndexOutOfBoundsException，非数字段抛 NumberFormatException；
+        // 只捕后者会让畸形链接穿透为 500（本项目无 @ControllerAdvice）。
+        Integer parsedGid = parseGidFromLink(link);
+        if (parsedGid == null) {
             response.failure("链接错误");
             pushService.taskCreateReport(user.getUsername(), "未知任务", response);
             return response.toJSONString();
         }
+        int gid = parsedGid;
         String taskName = "任务 [" + gid + "]";
 
         if (remoteService.isDead()) {
@@ -126,6 +132,23 @@ public class GalleryManageService {
         return response.toJSONString();
     }
 
+    /**
+     * 从任务链接中安全提取 gid。任何畸形输入（null、段数不足、非数字）都返回 null，
+     * 由调用方转成业务失败，避免异常穿透为 500。
+     */
+    static Integer parseGidFromLink(String link) {
+        if (link == null)
+            return null;
+        String[] segments = link.split("/");
+        if (segments.length <= 4)
+            return null;
+        try {
+            return Integer.parseInt(segments[4]);
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+
     /**
      * 尝试重新连接
      * @return 重连结果
@@ -284,21 +307,35 @@ public class GalleryManageService {
             response.failure("删除失败，该图片不存在");
             return response.toJSONString();
         }
+        if (user == null) {
+            response.failure("删除失败，授权码无效");
+            return response.toJSONString();
+        }
 
         ArrayList<Integer> collector = collectMapper.selectCollectorByGid(gallery.getGid());
-        if (!(collector.isEmpty() || collector.size() == 1 && collector.getFirst().equals(user.getId())         //判断收藏
+        // 拒绝条件与提示文案一致：被别人收藏，或者请求者不是下载人。
-                && gallery.getDownloader() == user.getId()))                                                   //判断下载
+        // 注意不能写成 collector.isEmpty() || ...：那样在「无任何收藏」时会短路放行，
+        // 从而完全跳过下载者校验，导致任何有效授权码都能删除他人任务。
+        boolean collectedByOthers = collector.stream().anyMatch(id -> id != user.getId());
+        boolean isDownloader = gallery.getDownloader() == user.getId();
+        if (collectedByOthers || !isDownloader) {
             response.failure("删除失败，该图片已被别人收藏或你不是下载人");
-        else {
+            log.info("拒绝删除 gid={}：collectedByOthers={} isDownloader={}", gid, collectedByOthers, isDownloader);
-            log.info("删除图片{}", gallery.getName());
+            return response.toJSONString();
-            galleryMapper.deleteGalleryByGid(gallery.getGid());                                 //删除图片记录
         }
+
+        // 通过授权后才落库并通知节点，避免被拒请求仍删除节点文件。
+        log.info("删除图片{}", gallery.getName());
+        galleryMapper.deleteGalleryByGid(gallery.getGid());
         switch (remoteService.deleteGallery(gallery)) {
             case ErrorCode.IO_ERROR -> response.failure("图片:" + gallery.getName() + "删除失败，IO错误");
             case ErrorCode.FILE_NOT_FOUND -> response.failure("图片:" + gallery.getName() + "删除失败，文件不存在");
             case 0 -> response.success();
+            // 节点无响应/超时会返回 -1 等非枚举值；必须显式判失败，
+            // 否则 result 保持未设置，末尾的 response.get("result") 会抛 NPE。
+            default -> response.failure("图片:" + gallery.getName() + "删除失败，节点无响应");
         }
-        if (response.get("result").equals("failure"))
+        if (!response.isSuccess())
             log.info(response.getData());
         return response.toJSONString();
     }
@@ -313,8 +350,20 @@ public class GalleryManageService {
         CustomConfiguration lastResetAmountTime = configurationMapper.selectConfiguration(CustomConfiguration.LAST_RESET_AMOUNT_TIME);
         Map<String, String> data = new HashMap<>();
 
-        data.put("weekUsedAmount", CustomUtil.fileSizeToString(Long.parseLong(weekUsedAmount.getValue())));
+        // 配置行缺失时给出默认值，避免 NPE 让用量接口整体不可用。
-        data.put("lastResetAmountTime", lastResetAmountTime.getValue());
+        String usedValue = weekUsedAmount == null || weekUsedAmount.getValue() == null
+                ? "0" : weekUsedAmount.getValue();
+        long used;
+        try {
+            used = Long.parseLong(usedValue);
+        } catch (NumberFormatException e) {
+            log.warn("每周用量配置值非法，按 0 处理: {}", usedValue);
+            used = 0L;
+        }
+        data.put("weekUsedAmount", CustomUtil.fileSizeToString(used));
+        data.put("lastResetAmountTime",
+                lastResetAmountTime == null || lastResetAmountTime.getValue() == null
+                        ? "" : lastResetAmountTime.getValue());
 
         response.success(new ObjectMapper().valueToTree(data).toString());
         return response.toJSONString();

src/main/java/com/lion/lionwebsite/Service/LocalService.java

@@ -9,11 +9,11 @@ import com.lion.lionwebsite.Util.CustomUtil;
 import com.lion.lionwebsite.Util.GalleryUtil;
 import lombok.Data;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.http.HttpEntity;
+import org.apache.hc.client5.http.classic.methods.HttpGet;
-import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
-import org.apache.http.client.methods.HttpGet;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
-import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
-import org.apache.http.impl.client.HttpClients;
+import org.apache.hc.core5.http.HttpEntity;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
@@ -228,7 +228,7 @@ public class LocalService{
         httpResponse = httpClient.execute(httpGet);
 
         HttpEntity responseEntity = httpResponse.getEntity();
-        int statusCode = httpResponse.getStatusLine().getStatusCode();
+        int statusCode = httpResponse.getCode();
         ArrayList<String> temp = new ArrayList<>();
 
         if (statusCode == 200) {

src/main/java/com/lion/lionwebsite/Service/PersonalService.java

@@ -12,7 +12,7 @@ import com.lion.lionwebsite.Interceptor.TaskHandlerInterceptor;
 import com.lion.lionwebsite.Util.CustomUtil;
 import com.lion.lionwebsite.Util.FileDownload;
 import com.lion.lionwebsite.Util.Response;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;

src/main/java/com/lion/lionwebsite/Service/QueryService.java

@@ -6,7 +6,7 @@ import com.lion.lionwebsite.Util.GalleryUtil;
 import com.lion.lionwebsite.Util.ImageFileCache;
 import java.nio.file.Path;
 import com.lion.lionwebsite.Util.Response;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 import jakarta.servlet.ServletOutputStream;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;

src/main/java/com/lion/lionwebsite/Service/SubscriptionRefreshService.java

@@ -4,12 +4,13 @@ import com.lion.lionwebsite.Dao.normal.SubMapper;
 import com.lion.lionwebsite.Domain.SubscriptionAccount;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.http.HttpEntity;
+import org.apache.hc.client5.http.classic.methods.HttpGet;
-import org.apache.http.client.config.RequestConfig;
+import org.apache.hc.client5.http.config.RequestConfig;
-import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
-import org.apache.http.client.methods.HttpGet;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
-import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
-import org.apache.http.impl.client.HttpClients;
+import org.apache.hc.core5.http.HttpEntity;
+import org.apache.hc.core5.util.Timeout;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 
@@ -27,8 +28,11 @@ import java.util.concurrent.locks.Lock;
 @RequiredArgsConstructor
 public class SubscriptionRefreshService {
     private static final CloseableHttpClient HTTP_CLIENT = HttpClients.custom()
-            .setDefaultRequestConfig(RequestConfig.custom().setConnectTimeout(5_000)
+            .setDefaultRequestConfig(RequestConfig.custom()
-                    .setConnectionRequestTimeout(5_000).setSocketTimeout(15_000).build())
+                    .setConnectTimeout(Timeout.ofMilliseconds(5_000))
+                    .setConnectionRequestTimeout(Timeout.ofMilliseconds(5_000))
+                    // HttpClient 5 将 socket 读超时改名为 responseTimeout。
+                    .setResponseTimeout(Timeout.ofMilliseconds(15_000)).build())
             .build();
     private static final Pattern MULTIPLIER = Pattern.compile("(\\d+(?:\\.\\d+)?)x\\s*$", Pattern.CASE_INSENSITIVE);
 
@@ -218,8 +222,8 @@ public class SubscriptionRefreshService {
     List<String> download(String url) throws IOException {
         HttpGet get = new HttpGet(url);
         try (CloseableHttpResponse response = HTTP_CLIENT.execute(get)) {
-            if (response.getStatusLine().getStatusCode() != 200)
+            if (response.getCode() != 200)
-                throw new IOException("上游 HTTP 状态码 " + response.getStatusLine().getStatusCode());
+                throw new IOException("上游 HTTP 状态码 " + response.getCode());
             HttpEntity entity = response.getEntity();
             if (entity == null)
                 throw new IOException("上游返回为空");

src/main/java/com/lion/lionwebsite/Service/SubscriptionStandbySnapshotService.java

@@ -1,6 +1,6 @@
 package com.lion.lionwebsite.Service;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 import com.lion.lionwebsite.Dao.normal.SubMapper;
 import com.lion.lionwebsite.Domain.SubBind;
 import com.lion.lionwebsite.Domain.SubscriptionAccount;

src/main/java/com/lion/lionwebsite/Service/UserService.java

@@ -7,7 +7,7 @@ import com.lion.lionwebsite.Domain.User;
 import com.lion.lionwebsite.Interceptor.TaskHandlerInterceptor;
 import com.lion.lionwebsite.Util.CustomUtil;
 import com.lion.lionwebsite.Util.Response;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;

src/main/java/com/lion/lionwebsite/Service/WebSocketService.java

@@ -1,7 +1,7 @@
 package com.lion.lionwebsite.Service;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
+import tools.jackson.databind.node.ObjectNode;
 import com.lion.lionwebsite.Domain.GalleryTask;
 import com.lion.lionwebsite.Util.CustomUtil;
 import lombok.extern.slf4j.Slf4j;

src/main/java/com/lion/lionwebsite/Util/CustomUtil.java

@@ -1,6 +1,6 @@
 package com.lion.lionwebsite.Util;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectMapper;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.Data;
 import lombok.extern.slf4j.Slf4j;

src/main/java/com/lion/lionwebsite/Util/GalleryUtil.java

@@ -1,21 +1,22 @@
 package com.lion.lionwebsite.Util;
 
-import com.fasterxml.jackson.databind.JsonNode;
+import tools.jackson.databind.JsonNode;
 import com.lion.lionwebsite.Domain.Gallery;
 import com.lion.lionwebsite.Domain.ImageKeyCache;
 import com.lion.lionwebsite.Exception.ResolutionNotMatchException;
-import org.apache.http.HttpEntity;
-import org.apache.http.client.config.RequestConfig;
 import java.nio.file.*;
 import java.util.concurrent.TimeUnit;
-import org.apache.http.client.entity.EntityBuilder;
+import org.apache.hc.client5.http.classic.methods.HttpGet;
-import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.hc.client5.http.classic.methods.HttpPost;
-import org.apache.http.client.methods.HttpGet;
+import org.apache.hc.client5.http.config.RequestConfig;
-import org.apache.http.client.methods.HttpPost;
+import org.apache.hc.client5.http.entity.EntityBuilder;
-import org.apache.http.entity.ContentType;
+import org.apache.hc.client5.http.entity.mime.MultipartEntityBuilder;
-import org.apache.http.entity.mime.MultipartEntityBuilder;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
-import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
-import org.apache.http.impl.client.HttpClients;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
+import org.apache.hc.core5.http.ContentType;
+import org.apache.hc.core5.http.HttpEntity;
+import org.apache.hc.core5.util.Timeout;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Element;
@@ -48,8 +49,11 @@ public class GalleryUtil {
 
     /** Reusable HTTP client —不要每次请求新建 */
     private static final CloseableHttpClient httpClient = HttpClients.custom()
-            .setDefaultRequestConfig(RequestConfig.custom().setConnectTimeout(5_000)
+            .setDefaultRequestConfig(RequestConfig.custom()
-                    .setConnectionRequestTimeout(5_000).setSocketTimeout(15_000).build()).build();
+                    .setConnectTimeout(Timeout.ofMilliseconds(5_000))
+                    .setConnectionRequestTimeout(Timeout.ofMilliseconds(5_000))
+                    // HttpClient 5 将 socket 读超时改名为 responseTimeout。
+                    .setResponseTimeout(Timeout.ofMilliseconds(15_000)).build()).build();
 
     /** E-Hentai Cookie, injected from application.yaml via CustomBean */
     private static String ehentaiCookie = "";
@@ -348,7 +352,7 @@ public class GalleryUtil {
         }
         try (httpResponse) {
             HttpEntity responseEntity = httpResponse.getEntity();
-            int statusCode = httpResponse.getStatusLine().getStatusCode();
+            int statusCode = httpResponse.getCode();
             StringBuilder stringBuilder = new StringBuilder();
             if (statusCode == 200 && responseEntity != null) {
                 try (BufferedReader reader = new BufferedReader(new InputStreamReader(responseEntity.getContent()))) {

src/main/java/com/lion/lionwebsite/Util/Response.java

@@ -1,7 +1,7 @@
 package com.lion.lionwebsite.Util;
 
-import com.fasterxml.jackson.databind.JsonNode;
+import tools.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
+import tools.jackson.databind.node.ObjectNode;
 
 
 public class Response {
@@ -19,7 +19,8 @@ public class Response {
     }
 
     public String get(String key){
-        return result.get(key).asText();
+        JsonNode node = result.get(key);
+        return node == null ? null : node.asText();
     }
 
     public void setData(String data){
@@ -57,7 +58,8 @@ public class Response {
     }
 
     public String getData(){
-        return result.get("data").asText();
+        JsonNode node = result.get("data");
+        return node == null ? null : node.asText();
     }
 
     /**
@@ -69,8 +71,10 @@ public class Response {
         return getData();
     }
 
+    /** 未设置 result 键时视为失败，而不是抛 NPE。 */
     public boolean isSuccess(){
-        return result.get("result").asText().equals("success");
+        JsonNode node = result.get("result");
+        return node != null && "success".equals(node.asText());
     }
 
 

src/test/java/com/lion/lionwebsite/Filter/AdaptorFilterTest.java

@@ -0,0 +1,108 @@
+package com.lion.lionwebsite.Filter;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * 主站入口的 UA 分流过滤器：把移动端访客导向 /mobile，其余放行。
+ * 它挂在 "/" 与 "/personal/" 上，判定错误会让桌面端用户被错误重定向，故两侧都要锁住。
+ */
+class AdaptorFilterTest {
+
+    private final AdaptorFilter filter = new AdaptorFilter();
+
+    private record Result(boolean chainCalled, String redirectedTo) {}
+
+    private Result run(String userAgent, String servletPath, String authCode) throws Exception {
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        FilterChain chain = mock(FilterChain.class);
+
+        when(request.getHeader("User-Agent")).thenReturn(userAgent);
+        when(request.getHeader("X-Forwarded-For")).thenReturn("203.0.113.9");
+        when(request.getParameter("AuthCode")).thenReturn(authCode);
+        when(request.getServletPath()).thenReturn(servletPath);
+
+        filter.doFilter(request, response, chain);
+
+        String redirect = null;
+        var captor = org.mockito.ArgumentCaptor.forClass(String.class);
+        verify(response, atMost(1)).sendRedirect(captor.capture());
+        if (!captor.getAllValues().isEmpty()) redirect = captor.getValue();
+        return new Result(org.mockito.Mockito.mockingDetails(chain).getInvocations().size() > 0, redirect);
+    }
+
+    @Test
+    void desktopUserAgentPassesThrough() throws Exception {
+        Result r = run("Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0", "/", null);
+        assertTrue(r.chainCalled(), "桌面 UA 必须放行到后续处理");
+        assertNull(r.redirectedTo(), "桌面 UA 不应被重定向");
+    }
+
+    @Test
+    void androidUserAgentIsRedirectedToMobile() throws Exception {
+        Result r = run("Mozilla/5.0 (Linux; Android 13) Chrome/120.0", "/", null);
+        assertFalse(r.chainCalled(), "移动 UA 不应继续走桌面链路");
+        assertEquals("/mobile", r.redirectedTo());
+    }
+
+    @Test
+    void iPhoneUserAgentIsRedirectedToMobile() throws Exception {
+        Result r = run("Mozilla/5.0 (iPhone; CPU iPhone OS 17_0) Safari/604.1", "/", null);
+        assertEquals("/mobile", r.redirectedTo());
+    }
+
+    /** 带 AuthCode=alone 的个人页访问应把授权码透传到移动端，否则移动端要重新输入。 */
+    @Test
+    void personalPageOnMobilePreservesAloneAuthCode() throws Exception {
+        Result r = run("Mozilla/5.0 (Linux; Android 13)", "/personal/", "alone");
+        assertEquals("/mobile?AuthCode=alone", r.redirectedTo());
+    }
+
+    /** 个人页 + 移动端 + 非 alone 的授权码：不透传，仅跳转基础路径。 */
+    @Test
+    void personalPageOnMobileWithOtherAuthCodeDoesNotLeakIt() throws Exception {
+        Result r = run("Mozilla/5.0 (Linux; Android 13)", "/personal/", "secret-code");
+        assertEquals("/mobile", r.redirectedTo());
+        assertFalse(r.redirectedTo().contains("secret-code"), "非 alone 的授权码不得出现在跳转 URL 中");
+    }
+
+    /** 桌面 UA 访问个人页时不得因 AuthCode=alone 被误跳转到移动端。 */
+    @Test
+    void desktopPersonalPageWithAloneIsNotRedirected() throws Exception {
+        Result r = run("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)", "/personal/", "alone");
+        assertTrue(r.chainCalled());
+        assertNull(r.redirectedTo());
+    }
+
+    /** /validate 是验证入口，必须放行，且移动 UA 也不应被重定向。 */
+    @Test
+    void validatePathAlwaysPassesThrough() throws Exception {
+        Result desktop = run("Mozilla/5.0 (Windows NT 10.0)", "/validate", null);
+        assertTrue(desktop.chainCalled());
+        assertNull(desktop.redirectedTo());
+
+        Result mobile = run("Mozilla/5.0 (Linux; Android 13)", "/validate", null);
+        assertTrue(mobile.chainCalled(), "/validate 在移动 UA 下也必须放行");
+        assertNull(mobile.redirectedTo());
+    }
+
+    /** UA 缺失时直接返回（不重定向、不放行），避免无 UA 客户端进入业务链路。 */
+    @Test
+    void missingUserAgentNeitherRedirectsNorContinues() throws Exception {
+        Result r = run(null, "/", null);
+        assertFalse(r.chainCalled(), "无 UA 的请求不应继续");
+        assertNull(r.redirectedTo(), "无 UA 的请求也不应被重定向");
+    }
+
+    @Test
+    void iphonePersonalPagePreservesAloneAuthCode() throws Exception {
+        Result r = run("Mozilla/5.0 (iPhone; CPU iPhone OS 17_0)", "/personal/", "alone");
+        assertEquals("/mobile?AuthCode=alone", r.redirectedTo());
+    }
+}

src/test/java/com/lion/lionwebsite/Interceptor/TaskHandlerInterceptorTest.java

@@ -0,0 +1,121 @@
+package com.lion.lionwebsite.Interceptor;
+
+import com.lion.lionwebsite.Dao.normal.UserMapper;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * 任务接口的鉴权拦截器。它决定谁能操作下载任务，是应用内唯一的授权判定点，
+ * 因此这里覆盖「放行」与「拒绝」两侧，并锁死若干必须拒绝的输入形态。
+ */
+class TaskHandlerInterceptorTest {
+
+    private UserMapper mapper;
+    private TaskHandlerInterceptor interceptor;
+
+    @BeforeEach
+    void setUp() {
+        mapper = mock(UserMapper.class);
+        interceptor = new TaskHandlerInterceptor(mapper);
+    }
+
+    /** 以给定 AuthCodes 初始化，并针对某次请求参数返回放行与否。 */
+    private boolean handle(String[] codes, String requestAuthCode) {
+        when(mapper.selectAllAuthCode()).thenReturn(codes);
+        interceptor.init();
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        when(request.getParameter("AuthCode")).thenReturn(requestAuthCode);
+        return interceptor.preHandle(request, mock(HttpServletResponse.class), new Object());
+    }
+
+    @Test
+    void validAuthCodeIsAllowed() {
+        assertTrue(handle(new String[]{"aaaa-bbbb", "cccc-dddd"}, "cccc-dddd"));
+    }
+
+    @Test
+    void firstConfiguredAuthCodeIsAllowed() {
+        assertTrue(handle(new String[]{"first", "second"}, "first"));
+    }
+
+    @Test
+    void unknownAuthCodeIsRejected() {
+        assertFalse(handle(new String[]{"aaaa-bbbb"}, "not-a-real-code"));
+    }
+
+    @Test
+    void missingAuthCodeIsRejected() {
+        assertFalse(handle(new String[]{"aaaa-bbbb"}, null));
+    }
+
+    @Test
+    void emptyAuthCodeIsRejected() {
+        assertFalse(handle(new String[]{"aaaa-bbbb"}, ""));
+    }
+
+    @Test
+    void blankLookalikeIsRejected() {
+        assertFalse(handle(new String[]{"aaaa-bbbb"}, "  "));
+    }
+
+    /** 前缀/后缀匹配不得被当作通过，避免宽松比较导致的越权。 */
+    @Test
+    void prefixAndSuffixVariantsAreRejected() {
+        assertFalse(handle(new String[]{"secret-code"}, "secret"), "前缀不得放行");
+        assertFalse(handle(new String[]{"secret-code"}, "secret-code-extra"), "多余后缀不得放行");
+        assertFalse(handle(new String[]{"secret-code"}, "SECRET-CODE"), "大小写不同不得放行");
+    }
+
+    /** 未配置任何 AuthCode 时，除 null 外的输入都必须拒绝。 */
+    @Test
+    void noConfiguredCodesRejectsEverything() {
+        assertFalse(handle(new String[]{}, "anything"));
+        assertFalse(handle(new String[]{}, ""));
+        assertFalse(handle(new String[]{}, null));
+    }
+
+    /** 列表中含 null 项时不得抛 NPE（历史数据可能产生 null AuthCode）。 */
+    @Test
+    void nullEntryInConfiguredCodesDoesNotThrow() {
+        assertFalse(handle(new String[]{"good", null}, "some-code"));
+        assertTrue(handle(new String[]{"good", null}, "good"));
+    }
+
+    /** 初始化后按数据库当前值判定，不缓存过期结果。 */
+    @Test
+    void initLoadsCodesFromMapper() {
+        when(mapper.selectAllAuthCode()).thenReturn(new String[]{"x"});
+        interceptor.init();
+        verify(mapper).selectAllAuthCode();
+
+        HttpServletRequest request = mock(HttpServletRequest.class);
+        when(request.getParameter("AuthCode")).thenReturn("x");
+        assertTrue(interceptor.preHandle(request, mock(HttpServletResponse.class), new Object()));
+    }
+
+    /** updateAuthCodes 必须改用 selectEnableAuthCode，使被吊销的授权码立即失效。 */
+    @Test
+    void updateAuthCodesSwitchesToEnabledSet() {
+        when(mapper.selectAllAuthCode()).thenReturn(new String[]{"old-code"});
+        interceptor.init();
+        verify(mapper).selectAllAuthCode();
+
+        when(mapper.selectEnableAuthCode()).thenReturn(new String[]{"new-code"});
+        interceptor.updateAuthCodes();
+        verify(mapper).selectEnableAuthCode();
+
+        HttpServletRequest revoked = mock(HttpServletRequest.class);
+        when(revoked.getParameter("AuthCode")).thenReturn("old-code");
+        assertFalse(interceptor.preHandle(revoked, mock(HttpServletResponse.class), new Object()),
+                "刷新后旧的授权码必须失效");
+
+        HttpServletRequest current = mock(HttpServletRequest.class);
+        when(current.getParameter("AuthCode")).thenReturn("new-code");
+        assertTrue(interceptor.preHandle(current, mock(HttpServletResponse.class), new Object()));
+    }
+}

src/test/java/com/lion/lionwebsite/Message/MessageCodecTest.java

@@ -0,0 +1,315 @@
+package com.lion.lionwebsite.Message;
+
+import com.lion.lionwebsite.Domain.GalleryTask;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.embedded.EmbeddedChannel;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * 节点通信的线协议编解码。该格式是主站与 storageNode 的契约：
+ * 帧 = [messageType(1B)][bodyLength(4B, 大端)][JSON body]，
+ * 两侧各自使用 Jackson（主站 Jackson 3、节点 Jackson 2.x），故这里同时锁死编码结果与解码容错。
+ */
+class MessageCodecTest {
+
+    private EmbeddedChannel channel;
+
+    private EmbeddedChannel channel() {
+        channel = new EmbeddedChannel(new MessageCodec());
+        return channel;
+    }
+
+    @AfterEach
+    void tearDown() {
+        if (channel != null) channel.finishAndReleaseAll();
+    }
+
+    /** 编码一条消息并取回其帧。 */
+    private static ByteBuf encode(EmbeddedChannel ch, AbstractMessage message) {
+        assertTrue(ch.writeOutbound(message), "消息应被编码并写入出站缓冲");
+        ByteBuf frame = ch.readOutbound();
+        assertNotNull(frame, "应能取出编好的帧");
+        return frame;
+    }
+
+    /** 解码一个帧并返回产出的消息（无产出时返回 null）。 */
+    private static <T> T decode(EmbeddedChannel ch, ByteBuf frame) {
+        assertTrue(ch.writeInbound(frame), "帧应被解码器消费");
+        return ch.readInbound();
+    }
+
+    /** 只读地取出帧头声明长度与正文，不移动读指针。 */
+    private static String frameBody(ByteBuf frame) {
+        int length = frame.getInt(1);
+        byte[] body = new byte[length];
+        frame.getBytes(5, body);
+        return new String(body, StandardCharsets.UTF_8);
+    }
+
+    /** 帧头必须是 1 字节类型 + 4 字节长度，且长度等于正文实际字节数。 */
+    private static void assertWellFormedFrame(ByteBuf frame, byte expectedType, String expectedJsonFragment) {
+        assertEquals(expectedType, frame.getByte(0), "messageType 应为帧首字节");
+        String json = frameBody(frame);
+        assertEquals(frame.getInt(1), json.getBytes(StandardCharsets.UTF_8).length,
+                "帧头声明长度须等于正文实际字节数");
+        assertTrue(json.contains(expectedJsonFragment),
+                "正文应包含 " + expectedJsonFragment + "，实际为 " + json);
+    }
+
+    @Test
+    void downloadPostRoundTripsTaskAndKeepsFieldValues() {
+        GalleryTask task = new GalleryTask();
+        task.setGid(123456);
+        task.setName("sample gallery");
+        task.setStatus(GalleryTask.DOWNLOADING);
+        task.setProceeding(7);
+        task.setPath("/secret/path");
+
+        DownloadPostMessage out = new DownloadPostMessage();
+        out.setMessageId(42);
+        out.setGalleryTask(task);
+
+        EmbeddedChannel ch = channel();
+        ByteBuf frame = encode(ch, out);
+        assertWellFormedFrame(frame, AbstractMessage.DOWNLOAD_POST_MESSAGE, "123456");
+        assertFalse(frameBody(frame).contains("/secret/path"),
+                "path 标注了 @JsonIgnore，不应出现在帧内（会泄漏存储机本地路径）");
+
+        DownloadPostMessage in = decode(ch, frame);
+        assertNotNull(in);
+        assertEquals(42, in.getMessageId(), "messageId 必须原样保留，否则响应无法对号");
+        assertNotNull(in.getGalleryTask());
+        assertEquals(123456, in.getGalleryTask().getGid());
+        assertEquals("sample gallery", in.getGalleryTask().getName());
+        assertEquals(GalleryTask.DOWNLOADING, in.getGalleryTask().getStatus());
+        assertEquals(7, in.getGalleryTask().getProceeding());
+    }
+
+    @Test
+    void downloadStatusRoundTripsArrayPreservingOrder() {
+        GalleryTask first = new GalleryTask();
+        first.setGid(1);
+        first.setName("a");
+        first.setStatus(GalleryTask.COMPRESS_COMPLETE);
+        GalleryTask second = new GalleryTask();
+        second.setGid(2);
+        second.setName("b");
+        second.setStatus(GalleryTask.COMPRESSING);
+
+        DownloadStatusMessage out = new DownloadStatusMessage();
+        out.setMessageId(7);
+        out.setGalleryTasks(new GalleryTask[]{first, second});
+
+        EmbeddedChannel ch = channel();
+        DownloadStatusMessage in = decode(ch, encode(ch, out));
+
+        assertNotNull(in);
+        assertEquals(2, in.getGalleryTasks().length);
+        assertEquals(1, in.getGalleryTasks()[0].getGid(), "数组顺序必须保持");
+        assertEquals(GalleryTask.COMPRESS_COMPLETE, in.getGalleryTasks()[0].getStatus());
+        assertEquals(GalleryTask.COMPRESSING, in.getGalleryTasks()[1].getStatus());
+    }
+
+    @Test
+    void responseMessageRoundTripsResultCode() {
+        ResponseMessage out = new ResponseMessage();
+        out.setMessageId(99);
+        out.setResult((byte) 3);
+
+        EmbeddedChannel ch = channel();
+        ResponseMessage in = decode(ch, encode(ch, out));
+
+        assertNotNull(in);
+        assertEquals(99, in.getMessageId());
+        assertEquals(3, in.getResult(), "result 码承载节点语义，不能丢");
+    }
+
+    @Test
+    void identityDeleteAndAvailableCheckRoundTrip() {
+        EmbeddedChannel ch = channel();
+
+        IdentityMessage identityOut = new IdentityMessage("lionwebsite");
+        identityOut.setMessageId(1);
+        IdentityMessage identity = decode(ch, encode(ch, identityOut));
+        assertNotNull(identity);
+        assertEquals("lionwebsite", identity.getIdentity(), "身份串决定节点是否登记为 server");
+
+        DeleteGalleryMessage deleteOut = new DeleteGalleryMessage();
+        deleteOut.setMessageId(5);
+        deleteOut.setGalleryName("gallery-name");
+        DeleteGalleryMessage delete = decode(ch, encode(ch, deleteOut));
+        assertNotNull(delete);
+        assertEquals("gallery-name", delete.getGalleryName());
+
+        AvailableCheckMessage checkOut = new AvailableCheckMessage();
+        checkOut.setMessageId(8);
+        assertNotNull(decode(ch, encode(ch, checkOut)));
+    }
+
+    @Test
+    void maintainMessageEncodesWithItsOwnType() {
+        MaintainMessage out = new MaintainMessage();
+        out.setMessageId(11);
+
+        EmbeddedChannel ch = channel();
+        ByteBuf frame = encode(ch, out);
+        assertEquals(AbstractMessage.MAINTAIN_MESSAGE, frame.getByte(0));
+    }
+
+    @Test
+    void subscriptionSnapshotRoundTripsAllTopLevelFields() {
+        SubscriptionSnapshotMessage out = new SubscriptionSnapshotMessage();
+        out.setMessageId(77);
+        out.setSchemaVersion(1);
+        out.setRevision("rev-abc");
+        out.setGeneratedAt(1789364669466L);
+        out.setPayloadBase64("cGF5bG9hZA==");
+        out.setPayloadSha256("payload-hash");
+        out.setSignature("sig");
+
+        EmbeddedChannel ch = channel();
+        SubscriptionSnapshotMessage in = decode(ch, encode(ch, out));
+
+        assertNotNull(in);
+        assertEquals(77, in.getMessageId());
+        assertEquals(1, in.getSchemaVersion());
+        assertEquals("rev-abc", in.getRevision());
+        assertEquals(1789364669466L, in.getGeneratedAt());
+        assertEquals("cGF5bG9hZA==", in.getPayloadBase64());
+        assertEquals("payload-hash", in.getPayloadSha256());
+        assertEquals("sig", in.getSignature());
+    }
+
+    /** payload 内嵌对象的往返：账号/绑定快照字段必须逐个保真，否则备机分发会串账号。 */
+    @Test
+    void snapshotPayloadSurvivesNestedJsonRoundTrip() throws Exception {
+        tools.jackson.databind.ObjectMapper mapper = new tools.jackson.databind.ObjectMapper();
+
+        SubscriptionAccountSnapshot account = new SubscriptionAccountSnapshot();
+        account.setAccountId(12);
+        account.setEnabled(false);
+        account.setFilterHighMultiplier(true);
+        account.setV2ContentBase64("YWJj");
+        account.setClashContentBase64("ZGVm");
+        account.setV2Sha256("h-v2");
+        account.setClashSha256("h-clash");
+
+        SubscriptionBindingSnapshot binding = new SubscriptionBindingSnapshot();
+        binding.setPublicKeySha256("pub");
+        binding.setAccountId(12);
+
+        SubscriptionSnapshotPayload payload = new SubscriptionSnapshotPayload();
+        payload.setSchemaVersion(2);
+        payload.setAccounts(new java.util.ArrayList<>(java.util.List.of(account)));
+        payload.setBindings(new java.util.ArrayList<>(java.util.List.of(binding)));
+
+        SubscriptionSnapshotPayload back =
+                mapper.readValue(mapper.writeValueAsString(payload), SubscriptionSnapshotPayload.class);
+
+        assertEquals(2, back.getSchemaVersion());
+        assertEquals(1, back.getAccounts().size());
+        assertEquals(1, back.getBindings().size());
+        SubscriptionAccountSnapshot a = back.getAccounts().get(0);
+        assertEquals(12, a.getAccountId());
+        assertFalse(a.isEnabled());
+        assertTrue(a.isFilterHighMultiplier());
+        assertEquals("YWJj", a.getV2ContentBase64());
+        assertEquals("ZGVm", a.getClashContentBase64());
+        assertEquals("h-clash", a.getClashSha256());
+        assertEquals(12, back.getBindings().get(0).getAccountId());
+        assertEquals("pub", back.getBindings().get(0).getPublicKeySha256());
+    }
+
+    /** 未显式设置的列表字段必须是空列表而非 null，否则节点侧遍历会 NPE。 */
+    @Test
+    void unsetPayloadListsDefaultToEmptyNotNul() {
+        SubscriptionSnapshotPayload payload = new SubscriptionSnapshotPayload();
+        assertNotNull(payload.getAccounts());
+        assertNotNull(payload.getBindings());
+        assertTrue(payload.getAccounts().isEmpty());
+        assertTrue(payload.getBindings().isEmpty());
+    }
+
+    /** 未知消息类型必须被静默丢弃，否则单条坏帧会打断整条节点连接。 */
+    @Test
+    void unknownMessageTypeIsDroppedWithoutThrowing() {
+        EmbeddedChannel ch = new EmbeddedChannel(new MessageCodec());
+        try {
+            ByteBuf buf = ch.alloc().buffer();
+            buf.writeByte((byte) 120);
+            byte[] body = "{}".getBytes(StandardCharsets.UTF_8);
+            buf.writeInt(body.length);
+            buf.writeBytes(body);
+
+            ch.writeInbound(buf);
+            assertNull(ch.readInbound(), "未知类型不应产出消息");
+            assertTrue(ch.isActive(), "未知类型不应导致通道关闭");
+        } finally {
+            ch.finishAndReleaseAll();
+        }
+    }
+
+    /** name 为 null（@JsonInclude(NON_NULL)）时仍应正常往返，不得破坏其他字段。 */
+    @Test
+    void nullOptionalFieldsDoNotBreakRoundTrip() {
+        GalleryTask task = new GalleryTask();
+        task.setGid(1);
+        task.setName(null);
+        task.setStatus(GalleryTask.DOWNLOAD_COMPLETE);
+
+        DownloadPostMessage out = new DownloadPostMessage();
+        out.setMessageId(1);
+        out.setGalleryTask(task);
+
+        EmbeddedChannel ch = channel();
+        DownloadPostMessage in = decode(ch, encode(ch, out));
+        assertNotNull(in);
+        assertNotNull(in.getGalleryTask());
+        assertNull(in.getGalleryTask().getName());
+        assertEquals(GalleryTask.DOWNLOAD_COMPLETE, in.getGalleryTask().getStatus());
+    }
+
+    /** 多字节 UTF-8（中文画廊名）长度须按字节而非字符计算，否则接收端会截断正文。 */
+    @Test
+    void multibyteNamesUseByteLengthNotCharLength() {
+        GalleryTask task = new GalleryTask();
+        task.setGid(9);
+        task.setName("中文画廊名");
+        task.setStatus(GalleryTask.DOWNLOADING);
+
+        DownloadPostMessage out = new DownloadPostMessage();
+        out.setMessageId(3);
+        out.setGalleryTask(task);
+
+        EmbeddedChannel ch = channel();
+        ByteBuf frame = encode(ch, out);
+        assertTrue(frameBody(frame).contains("中文画廊名"));
+
+        DownloadPostMessage in = decode(ch, frame);
+        assertEquals("中文画廊名", in.getGalleryTask().getName());
+    }
+
+    /** 在两个独立编解码器间往返，确保格式不依赖实例共享状态。 */
+    @Test
+    void frameEncodedByOneCodecDecodesInAnother() {
+        EmbeddedChannel encoder = new EmbeddedChannel(new MessageCodec());
+        EmbeddedChannel decoder = new EmbeddedChannel(new MessageCodec());
+        try {
+            IdentityMessage out = new IdentityMessage("lionwebsiteside");
+            out.setMessageId(4);
+            ByteBuf frame = encode(encoder, out);
+            IdentityMessage in = decode(decoder, frame);
+            assertNotNull(in);
+            assertEquals("lionwebsiteside", in.getIdentity());
+            assertEquals(4, in.getMessageId());
+        } finally {
+            encoder.finishAndReleaseAll();
+            decoder.finishAndReleaseAll();
+        }
+    }
+}

src/test/java/com/lion/lionwebsite/Service/GalleryManageServiceTest.java

@@ -0,0 +1,421 @@
+package com.lion.lionwebsite.Service;
+
+import com.lion.lionwebsite.Dao.cache.ImageCacheMapper;
+import com.lion.lionwebsite.Dao.normal.*;
+import com.lion.lionwebsite.Domain.Gallery;
+import com.lion.lionwebsite.Domain.User;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * 任务创建与状态查询的校验分支。
+ * 这些分支决定错误链接、节点离线、重复任务等情况下的用户可见结果与落库行为，
+ * 失败时不得留下脏数据，也不得误删既有任务。
+ */
+class GalleryManageServiceTest {
+
+    private GalleryMapper galleries;
+    private CollectMapper collectMapper;
+    private CustomConfigurationMapper configurationMapper;
+    private UserMapper users;
+    private RemoteService remote;
+    private PushService push;
+    private GalleryManageService service;
+
+    @BeforeEach
+    void setUp() {
+        galleries = mock(GalleryMapper.class);
+        collectMapper = mock(CollectMapper.class);
+        configurationMapper = mock(CustomConfigurationMapper.class);
+        users = mock(UserMapper.class);
+        remote = mock(RemoteService.class);
+        push = mock(PushService.class);
+        service = new GalleryManageService(galleries, collectMapper,
+                configurationMapper, users, mock(ShareFileMapper.class),
+                mock(ImageCacheMapper.class), remote, push);
+
+        User user = new User();
+        user.setId(7);
+        user.setUsername("tester");
+        when(users.selectUserByAuthCode("code")).thenReturn(user);
+    }
+
+    // ---------- createTask 输入校验 ----------
+
+    /** 链接第 5 段非数字时应返回「链接错误」且不落库、不下发节点。 */
+    @Test
+    void malformedLinkIsRejectedWithoutPersisting() {
+        String response = service.createTask("https://example.org/g/not-a-number/key/", "original", "code");
+
+        assertTrue(response.contains("链接错误"), "应提示链接错误，实际: " + response);
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).insertGallery(any());
+        verify(remote, never()).addGalleryToQueue(any());
+        verify(push).taskCreateReport(eq("tester"), eq("未知任务"), any());
+    }
+
+    /**
+     * 回归：修复前 `link.split("/")[4]` 在段数不足时抛 ArrayIndexOutOfBoundsException，
+     * 而只捕获 NumberFormatException，且项目无 @ControllerAdvice，会穿透为 500。
+     * 现在统一转成「链接错误」业务失败。
+     */
+    @Test
+    void shortLinkIsRejectedGracefully() {
+        String response = assertDoesNotThrow(
+                () -> service.createTask("https://example.org/g", "original", "code"));
+        assertTrue(response.contains("链接错误"), "应友好提示链接错误: " + response);
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).insertGallery(any());
+        verify(remote, never()).addGalleryToQueue(any());
+    }
+
+    @Test
+    void nullLinkIsRejectedGracefully() {
+        String response = assertDoesNotThrow(() -> service.createTask(null, "original", "code"));
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).insertGallery(any());
+    }
+
+    /** 无效授权码应在解析链接之前就被拒，避免后续 user.getUsername() NPE。 */
+    @Test
+    void unknownAuthCodeIsRejectedBeforeParsing() {
+        User unknown = null;
+        when(users.selectUserByAuthCode("bogus")).thenReturn(unknown);
+        String response = assertDoesNotThrow(
+                () -> service.createTask("https://example.org/g/123/key/", "original", "bogus"));
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).insertGallery(any());
+    }
+
+    /** parseGidFromLink 的边界：合法/非法输入都应安全返回。 */
+    @Test
+    void parseGidFromLinkHandlesMalformedInput() {
+        assertEquals(123, GalleryManageService.parseGidFromLink("https://exhentai.org/g/123/key/"));
+        assertNull(GalleryManageService.parseGidFromLink(null));
+        assertNull(GalleryManageService.parseGidFromLink(""));
+        assertNull(GalleryManageService.parseGidFromLink("https://example.org/g"));
+        assertNull(GalleryManageService.parseGidFromLink("https://example.org/a/b/c"));
+        assertNull(GalleryManageService.parseGidFromLink("https://example.org/g/not-a-number/key/"));
+    }
+
+    /** 节点离线时必须明确告知用户，且不落库。 */
+    @Test
+    void taskIsRejectedWhenNodeIsOffline() {
+        when(remote.isDead()).thenReturn(true);
+
+        String response = service.createTask("https://example.org/g/555/key/", "original", "code");
+
+        assertTrue(response.contains("节点"), "应说明节点不可用，实际: " + response);
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).insertGallery(any());
+        verify(remote, never()).addGalleryToQueue(any());
+    }
+
+    // ---------- 查询 ----------
+
+    /** 按链接查询：无对应任务时应返回失败而不是抛异常。 */
+    @Test
+    void selectTaskByLinkReturnsFailureWhenAbsent() {
+        try (var parser = mockStatic(com.lion.lionwebsite.Util.GalleryUtil.class)) {
+            parser.when(() -> com.lion.lionwebsite.Util.GalleryUtil.parseGid(anyString())).thenReturn(999);
+            when(galleries.selectGalleryByGid(999)).thenReturn(null);
+
+            String response = service.selectTaskByLink("https://example.org/g/999/key/");
+            assertFalse(response.contains("\"result\":\"success\""));
+        }
+    }
+
+    @Test
+    void selectTaskByLinkReturnsTaskWhenPresent() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(321);
+        gallery.setName("sample [321]");
+        when(galleries.selectGalleryByGid(321)).thenReturn(gallery);
+
+        String response = service.selectTaskByLink("https://example.org/g/321/key/");
+        assertTrue(response.contains("321"), "应回传对应任务: " + response);
+    }
+
+    /** 链接无法解析出 gid 时应安全失败。 */
+    @Test
+    void selectTaskByLinkWithUnparsableLinkFailsSafely() {
+        try (var parser = mockStatic(com.lion.lionwebsite.Util.GalleryUtil.class)) {
+            parser.when(() -> com.lion.lionwebsite.Util.GalleryUtil.parseGid(anyString())).thenReturn(null);
+            String response = assertDoesNotThrow(() -> service.selectTaskByLink("garbage"));
+            assertFalse(response.contains("\"result\":\"success\""));
+        }
+    }
+
+    @Test
+    void selectTaskByGidReturnsFailureWhenAbsent() {
+        when(galleries.selectGalleryByGid(404)).thenReturn(null);
+        String response = service.selectTaskByGid(404);
+        assertFalse(response.contains("\"result\":\"success\""));
+    }
+
+    // ---------- 删除与重试 ----------
+
+    /** 删除不存在的任务应返回失败，且不调用删除。 */
+    @Test
+    void deleteNonexistentTaskFailsWithoutDeleting() {
+        when(galleries.selectGalleryByGid(777)).thenReturn(null);
+        String response = service.deleteGalleryByGid(777, "code");
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).deleteGalleryByGid(anyInt());
+    }
+
+    /**
+     * 回归：修复前当画廊无任何收藏时，`collector.isEmpty()` 使授权条件短路放行，
+     * 下载者身份完全未校验，任意有效授权码用户可删除他人任务。现已补上下载者校验。
+     */
+    @Test
+    void deleteWithoutCollectorsStillEnforcesDownloaderCheck() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(888);
+        gallery.setName("other-user-task [888]");
+        gallery.setDownloader(999);        // 属于别的用户
+        when(galleries.selectGalleryByGid(888)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(888)).thenReturn(new java.util.ArrayList<>());
+
+        String response = service.deleteGalleryByGid(888, "code");   // 请求者是 id=7
+
+        assertFalse(response.contains("\"result\":\"success\""), "非下载者删除必须被拒: " + response);
+        verify(galleries, never()).deleteGalleryByGid(anyInt());
+        verify(remote, never()).deleteGallery(any());
+    }
+
+    /**
+     * 回归：修复前 remoteService.deleteGallery 位于授权判断之外，
+     * 被拒请求仍会向节点下发删除指令，且 case 0 的 success 会覆盖 failure。
+     * 现在授权失败即提前返回，既不落库也不通知节点。
+     */
+    @Test
+    void deniedDeleteDoesNotTouchDatabaseOrNode() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(889);
+        gallery.setName("collected-by-other [889]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(889)).thenReturn(gallery);
+        // 有他人收藏 -> 授权应被拒
+        when(collectMapper.selectCollectorByGid(889))
+                .thenReturn(new java.util.ArrayList<>(java.util.List.of(999)));
+
+        String response = service.deleteGalleryByGid(889, "code");
+
+        assertFalse(response.contains("\"result\":\"success\""), "被他人收藏时删除必须被拒");
+        assertTrue(response.contains("别人收藏") || response.contains("不是下载人"),
+                "应给出与判定一致的提示: " + response);
+        verify(galleries, never()).deleteGalleryByGid(anyInt());
+        verify(remote, never()).deleteGallery(any());
+    }
+
+    /** 无收藏且本人是下载者：正常放行。 */
+    @Test
+    void deleteAllowsOwnerWhenNoCollectors() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(893);
+        gallery.setName("mine-no-collect [893]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(893)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(893)).thenReturn(new java.util.ArrayList<>());
+        when(remote.deleteGallery(any())).thenReturn((byte) 0);
+
+        String response = service.deleteGalleryByGid(893, "code");
+        assertTrue(response.contains("\"result\":\"success\""), "本人任务应可删除: " + response);
+        verify(galleries).deleteGalleryByGid(893);
+    }
+
+    /** 只有本人收藏时，本人可删除。 */
+    @Test
+    void deleteAllowsOwnerWhenOnlySelfCollected() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(894);
+        gallery.setName("mine-self-collect [894]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(894)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(894))
+                .thenReturn(new java.util.ArrayList<>(java.util.List.of(7)));
+        when(remote.deleteGallery(any())).thenReturn((byte) 0);
+
+        String response = service.deleteGalleryByGid(894, "code");
+        assertTrue(response.contains("\"result\":\"success\""), "仅本人收藏应可删除: " + response);
+        verify(galleries).deleteGalleryByGid(894);
+    }
+
+    /** 节点无响应（-1）必须如实报失败，不能被当成成功。 */
+    @Test
+    void deleteReportsFailureWhenNodeDoesNotRespond() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(895);
+        gallery.setName("mine [895]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(895)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(895)).thenReturn(new java.util.ArrayList<>());
+        when(remote.deleteGallery(any())).thenReturn((byte) -1);
+
+        String response = service.deleteGalleryByGid(895, "code");
+        assertFalse(response.contains("\"result\":\"success\""), "节点无响应不应报成功: " + response);
+        assertTrue(response.contains("节点无响应"), "应说明节点无响应: " + response);
+    }
+
+    /** 授权码无效（查不到用户）应被拒，且不得触发越权判定所需的空指针。 */
+    @Test
+    void deleteRejectsUnknownAuthCode() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(896);
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(896)).thenReturn(gallery);
+
+        String response = service.deleteGalleryByGid(896, "bogus-code");
+        assertFalse(response.contains("\"result\":\"success\""), "无效授权码应被拒: " + response);
+        verify(galleries, never()).deleteGalleryByGid(anyInt());
+        verify(remote, never()).deleteGallery(any());
+    }
+
+    /** 本人任务删除应放行并调用删除。 */
+    @Test
+    void deleteAllowsOwnTask() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(890);
+        gallery.setName("mine [890]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(890)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(890))
+                .thenReturn(new java.util.ArrayList<>(java.util.List.of(7)));
+        when(remote.deleteGallery(any())).thenReturn((byte) 0);
+
+        String response = service.deleteGalleryByGid(890, "code");
+        assertTrue(response.contains("\"result\":\"success\""), "本人任务应可删除: " + response);
+        verify(galleries).deleteGalleryByGid(890);
+    }
+
+    /** 节点返回 IO 错误时应如实反馈，不能被 success 覆盖。 */
+    @Test
+    void deleteReportsNodeIoError() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(891);
+        gallery.setName("mine [891]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(891)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(891))
+                .thenReturn(new java.util.ArrayList<>(java.util.List.of(7)));
+        when(remote.deleteGallery(any())).thenReturn(
+                com.lion.lionwebsite.Error.ErrorCode.IO_ERROR);
+
+        String response = service.deleteGalleryByGid(891, "code");
+        assertTrue(response.contains("IO错误"), "节点 IO 错误应如实返回: " + response);
+    }
+
+    /** 文件不存在的语义应与 IO 错误区分开。 */
+    @Test
+    void deleteReportsFileNotFoundDistinctly() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(892);
+        gallery.setName("mine [892]");
+        gallery.setDownloader(7);
+        when(galleries.selectGalleryByGid(892)).thenReturn(gallery);
+        when(collectMapper.selectCollectorByGid(892))
+                .thenReturn(new java.util.ArrayList<>(java.util.List.of(7)));
+        when(remote.deleteGallery(any())).thenReturn(
+                com.lion.lionwebsite.Error.ErrorCode.FILE_NOT_FOUND);
+
+        String response = service.deleteGalleryByGid(892, "code");
+        assertTrue(response.contains("文件不存在"), "应区分文件不存在: " + response);
+    }
+
+    /** 重试不存在的任务应返回失败。 */
+    @Test
+    void retryNonexistentTaskFails() {
+        when(galleries.selectGalleryByGid(555)).thenReturn(null);
+        String response = service.retryGallery(555);
+        assertFalse(response.contains("\"result\":\"success\""));
+    }
+
+    /** 已完成的任务重试是幂等的：返回成功并回显「下载完成」，不重复下发节点。 */
+    @Test
+    void retryOfCompletedTaskIsIdempotentSuccess() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(556);
+        gallery.setName("done [556]");
+        gallery.setStatus("下载完成");
+        when(galleries.selectGalleryByGid(556)).thenReturn(gallery);
+
+        String response = service.retryGallery(556);
+        assertTrue(response.contains("\"result\":\"success\""), "重复重试应幂等成功: " + response);
+        assertTrue(response.contains("下载完成"), "应回显当前已完成状态: " + response);
+        verify(remote, never()).retryGallery(any());
+    }
+
+    /** 节点离线时重试应失败且不改变任务状态。 */
+    @Test
+    void retryFailsWhenNodeOffline() {
+        Gallery gallery = new Gallery();
+        gallery.setGid(557);
+        gallery.setName("stuck [557]");
+        gallery.setStatus("已提交");
+        when(galleries.selectGalleryByGid(557)).thenReturn(gallery);
+        when(remote.isDead()).thenReturn(true);
+
+        String response = service.retryGallery(557);
+        assertFalse(response.contains("\"result\":\"success\""));
+        verify(galleries, never()).updateGallery(any());
+    }
+
+    @Test
+    void retryRejectsUnknownGidWithNoRecord() {
+        when(galleries.selectGalleryByGid(anyInt())).thenReturn(null);
+        assertFalse(service.retryGallery(1).contains("\"result\":\"success\""));
+        assertFalse(service.retryGallery(2).contains("\"result\":\"success\""));
+    }
+
+    // ---------- 列表 ----------
+
+    /** 用量查询应返回格式化后的已用量与上次重置时间。 */
+    @Test
+    void weekUsedAmountReturnsFormattedValues() {
+        com.lion.lionwebsite.Domain.CustomConfiguration used =
+                new com.lion.lionwebsite.Domain.CustomConfiguration();
+        used.setParameter(com.lion.lionwebsite.Domain.CustomConfiguration.WEEK_USED_AMOUNT);
+        used.setValue(String.valueOf(1024L * 1024 * 500));
+        com.lion.lionwebsite.Domain.CustomConfiguration reset =
+                new com.lion.lionwebsite.Domain.CustomConfiguration();
+        reset.setParameter(com.lion.lionwebsite.Domain.CustomConfiguration.LAST_RESET_AMOUNT_TIME);
+        reset.setValue("2026-09-14 14:23:58");
+        when(configurationMapper.selectConfiguration(
+                com.lion.lionwebsite.Domain.CustomConfiguration.WEEK_USED_AMOUNT)).thenReturn(used);
+        when(configurationMapper.selectConfiguration(
+                com.lion.lionwebsite.Domain.CustomConfiguration.LAST_RESET_AMOUNT_TIME)).thenReturn(reset);
+
+        String response = service.getWeekUsedAmount();
+
+        assertTrue(response.contains("500.00MB"), "已用量应格式化为人类可读: " + response);
+        assertTrue(response.contains("2026-09-14 14:23:58"), "应带上次重置时间: " + response);
+    }
+
+    /** 回归：配置行缺失时给出默认值，不再 NPE，保证用量接口始终可用。 */
+    @Test
+    void weekUsedAmountToleratesMissingConfigRows() {
+        when(configurationMapper.selectConfiguration(anyString())).thenReturn(null);
+
+        String response = assertDoesNotThrow(service::getWeekUsedAmount);
+        assertTrue(response.contains("\"result\":\"success\""), "应成功返回默认值: " + response);
+        assertTrue(response.contains("0B"), "缺失时用量应为 0B: " + response);
+    }
+
+    /** 配置值非法（非数字）时按 0 处理，不抛异常。 */
+    @Test
+    void weekUsedAmountToleratesMalformedValue() {
+        com.lion.lionwebsite.Domain.CustomConfiguration used =
+                new com.lion.lionwebsite.Domain.CustomConfiguration();
+        used.setValue("not-a-number");
+        when(configurationMapper.selectConfiguration(
+                com.lion.lionwebsite.Domain.CustomConfiguration.WEEK_USED_AMOUNT)).thenReturn(used);
+
+        String response = assertDoesNotThrow(service::getWeekUsedAmount);
+        assertTrue(response.contains("0B"), "非法值应按 0 处理: " + response);
+    }
+}

src/test/java/com/lion/lionwebsite/Service/SubServiceTest.java

@@ -0,0 +1,341 @@
+package com.lion.lionwebsite.Service;
+
+import com.lion.lionwebsite.Dao.normal.SubMapper;
+import com.lion.lionwebsite.Dao.normal.UserMapper;
+import com.lion.lionwebsite.Domain.SubBind;
+import com.lion.lionwebsite.Domain.SubscriptionAccount;
+import com.lion.lionwebsite.Domain.User;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * 子账号与绑定的业务规则。这些方法决定谁能拿到订阅、绑定到哪个账号，
+ * 校验失败必须返回业务 failure 而不是抛异常，且失败路径不得落库。
+ */
+class SubServiceTest {
+
+    private SubMapper subMapper;
+    private UserMapper userMapper;
+    private SubscriptionRefreshService refreshService;
+    private RemoteService remoteService;
+    private SubService service;
+
+    @BeforeEach
+    void setUp() {
+        subMapper = mock(SubMapper.class);
+        userMapper = mock(UserMapper.class);
+        refreshService = mock(SubscriptionRefreshService.class);
+        remoteService = mock(RemoteService.class);
+        service = new SubService(subMapper, userMapper, refreshService, remoteService,
+                new SubscriptionStateCoordinator());
+    }
+
+    private static SubscriptionAccount account(Integer id, String name, String key, boolean enabled) {
+        return new SubscriptionAccount(id, name, key, false, enabled, null, null, null, null, 0, null, null);
+    }
+
+    private static boolean ok(String json) {
+        return json.contains("\"result\":\"success\"");
+    }
+
+    // ---------- insertSubscriptionAccount ----------
+
+    @Test
+    void blankNameOrKeyIsRejectedWithoutInsert() {
+        assertFalse(ok(service.insertSubscriptionAccount("", "key", false, true)));
+        assertFalse(ok(service.insertSubscriptionAccount("name", "", false, true)));
+        assertFalse(ok(service.insertSubscriptionAccount("   ", "key", false, true)));
+        assertFalse(ok(service.insertSubscriptionAccount(null, "key", false, true)));
+        assertFalse(ok(service.insertSubscriptionAccount("name", null, false, true)));
+        verify(subMapper, never()).insertSubscriptionAccount(any());
+    }
+
+    @Test
+    void duplicateNameOrKeyIsRejected() {
+        when(subMapper.countSubscriptionAccountName("dup")).thenReturn(1);
+        assertFalse(ok(service.insertSubscriptionAccount("dup", "fresh-key", false, true)));
+
+        when(subMapper.countSubscriptionAccountName("fresh-name")).thenReturn(0);
+        when(subMapper.countSubscriptionAccountKey("used-key")).thenReturn(1);
+        assertFalse(ok(service.insertSubscriptionAccount("fresh-name", "used-key", false, true)));
+
+        verify(subMapper, never()).insertSubscriptionAccount(any());
+    }
+
+    /** 名称与上游 key 两端空白应被裁剪后再校验与入库。 */
+    @Test
+    void valuesAreTrimmedBeforePersisting() {
+        when(subMapper.countSubscriptionAccountName("trimmed")).thenReturn(0);
+        when(subMapper.countSubscriptionAccountKey("key123")).thenReturn(0);
+        doAnswer(inv -> {
+            inv.getArgument(0, SubscriptionAccount.class).setId(5);
+            return null;
+        }).when(subMapper).insertSubscriptionAccount(any());
+
+        assertTrue(ok(service.insertSubscriptionAccount("  trimmed  ", "  key123  ", true, false)));
+
+        var captor = org.mockito.ArgumentCaptor.forClass(SubscriptionAccount.class);
+        verify(subMapper).insertSubscriptionAccount(captor.capture());
+        assertEquals("trimmed", captor.getValue().getName());
+        assertEquals("key123", captor.getValue().getUpstreamKey());
+        assertTrue(captor.getValue().isFilterHighMultiplier());
+        assertFalse(captor.getValue().isEnabled(), "enabled 应原样透传");
+    }
+
+    /** enabled=true 时才立刻刷新并同步；enabled=false 时不应触发上游刷新。 */
+    @Test
+    void refreshAndSyncOnlyHappenForEnabledAccount() {
+        when(subMapper.countSubscriptionAccountName(anyString())).thenReturn(0);
+        when(subMapper.countSubscriptionAccountKey(anyString())).thenReturn(0);
+        doAnswer(inv -> {
+            inv.getArgument(0, SubscriptionAccount.class).setId(9);
+            return null;
+        }).when(subMapper).insertSubscriptionAccount(any());
+
+        service.insertSubscriptionAccount("enabled-one", "k1", false, true);
+        verify(refreshService).refresh(9);
+        verify(remoteService).requestSubscriptionSync();
+
+        clearInvocations(refreshService, remoteService);
+        service.insertSubscriptionAccount("disabled-one", "k2", false, false);
+        verify(refreshService, never()).refresh(anyInt());
+        verify(remoteService).requestSubscriptionSync();
+    }
+
+    // ---------- updateSubscriptionAccount ----------
+
+    @Test
+    void updatingMissingAccountFails() {
+        when(subMapper.selectSubscriptionAccount(404)).thenReturn(null);
+        assertFalse(ok(service.updateSubscriptionAccount(404, "n", "k", false, true)));
+        verify(subMapper, never()).updateSubscriptionAccount(any());
+    }
+
+    @Test
+    void updatingWithBlankFieldsFails() {
+        when(subMapper.selectSubscriptionAccount(1)).thenReturn(account(1, "old", "old-key", true));
+        assertFalse(ok(service.updateSubscriptionAccount(1, "", "key", false, true)));
+        assertFalse(ok(service.updateSubscriptionAccount(1, "name", "  ", false, true)));
+        verify(subMapper, never()).updateSubscriptionAccount(any());
+    }
+
+    /** 修改时不得与「其他」账号重名或重 key，但与自己相同应允许。 */
+    @Test
+    void updateRejectsConflictsWithOtherAccountsButAllowsSelf() {
+        when(subMapper.selectSubscriptionAccount(1)).thenReturn(account(1, "mine", "my-key", true));
+        when(subMapper.selectAllSubscriptionAccounts())
+                .thenReturn(new ArrayList<>(java.util.List.of(
+                        account(1, "mine", "my-key", true),
+                        account(2, "taken", "taken-key", true))));
+
+        assertFalse(ok(service.updateSubscriptionAccount(1, "taken", "my-key", false, true)),
+                "与其他账号重名应拒绝");
+        assertFalse(ok(service.updateSubscriptionAccount(1, "mine", "taken-key", false, true)),
+                "与其他账号重 key 应拒绝");
+
+        assertTrue(ok(service.updateSubscriptionAccount(1, "mine", "my-key", false, true)),
+                "与自身相同的名称/key 应允许");
+    }
+
+    @Test
+    void deleteRejectsAccountThatStillHasBindings() {
+        SubscriptionAccount bound = account(3, "bound", "k", true);
+        bound.setBoundUserCount(2);
+        when(subMapper.selectSubscriptionAccount(3)).thenReturn(bound);
+
+        assertFalse(ok(service.deleteSubscriptionAccount(3)));
+        verify(subMapper, never()).deleteSubscriptionAccount(anyInt());
+    }
+
+    @Test
+    void deleteSucceedsWhenNoBindingsRemain() {
+        SubscriptionAccount free = account(4, "free", "k", true);
+        free.setBoundUserCount(0);
+        when(subMapper.selectSubscriptionAccount(4)).thenReturn(free);
+
+        assertTrue(ok(service.deleteSubscriptionAccount(4)));
+        verify(subMapper).deleteSubscriptionAccount(4);
+        verify(refreshService).invalidateCache(4);
+    }
+
+    // ---------- insertSubBind ----------
+
+    @Test
+    void bindRejectsUnknownUser() {
+        when(userMapper.selectUserByUsername("ghost")).thenReturn(null);
+        assertFalse(ok(service.insertSubBind("ghost", 1)));
+        verify(subMapper, never()).insertSubBind(any());
+    }
+
+    @Test
+    void bindRejectsDisabledOrMissingAccount() {
+        when(userMapper.selectUserByUsername("alice")).thenReturn(new User());
+
+        when(subMapper.selectSubscriptionAccount(7)).thenReturn(null);
+        assertFalse(ok(service.insertSubBind("alice", 7)));
+
+        when(subMapper.selectSubscriptionAccount(8)).thenReturn(account(8, "off", "k", false));
+        assertFalse(ok(service.insertSubBind("alice", 8)), "已停用账号不可绑定");
+
+        verify(subMapper, never()).insertSubBind(any());
+    }
+
+    /** 账号尚无完整缓存时必须拒绝，否则用户会拿到空订阅。 */
+    @Test
+    void bindRejectsAccountWithoutCompleteCache() {
+        when(userMapper.selectUserByUsername("alice")).thenReturn(new User());
+        when(subMapper.selectSubscriptionAccount(1)).thenReturn(account(1, "a", "k", true));
+        when(refreshService.hasCompleteCache(1)).thenReturn(false);
+
+        assertFalse(ok(service.insertSubBind("alice", 1)));
+        verify(subMapper, never()).insertSubBind(any());
+    }
+
+    @Test
+    void bindRejectsUserThatAlreadyHasBinding() {
+        when(userMapper.selectUserByUsername("alice")).thenReturn(new User());
+        when(subMapper.selectSubscriptionAccount(1)).thenReturn(account(1, "a", "k", true));
+        when(refreshService.hasCompleteCache(1)).thenReturn(true);
+        when(subMapper.countSubBindByUser("alice")).thenReturn(1);
+
+        assertFalse(ok(service.insertSubBind("alice", 1)));
+        verify(subMapper, never()).insertSubBind(any());
+    }
+
+    /** 成功绑定时 key 应是 8 位随机串，且会避开已存在的 key。 */
+    @Test
+    void bindGeneratesUniqueEightCharKey() {
+        when(userMapper.selectUserByUsername("alice")).thenReturn(new User());
+        when(subMapper.selectSubscriptionAccount(1)).thenReturn(account(1, "a", "k", true));
+        when(refreshService.hasCompleteCache(1)).thenReturn(true);
+        when(subMapper.countSubBindByUser("alice")).thenReturn(0);
+        // 前两次「已存在」，第三次通过——验证重试而非直接失败
+        when(subMapper.selectSubBindExist(anyString())).thenReturn(true, true, false);
+
+        assertTrue(ok(service.insertSubBind("alice", 1)));
+
+        var captor = org.mockito.ArgumentCaptor.forClass(SubBind.class);
+        verify(subMapper).insertSubBind(captor.capture());
+        assertEquals(8, captor.getValue().getKey().length(), "订阅 key 应为 8 位");
+        assertEquals("alice", captor.getValue().getUser());
+        assertEquals(1, captor.getValue().getSubscriptionAccountId());
+        verify(subMapper, times(3)).selectSubBindExist(anyString());
+        verify(remoteService).requestSubscriptionSync();
+    }
+
+    @Test
+    void resetKeyRejectsUserWithoutBinding() {
+        when(subMapper.countSubBindByUser("nobody")).thenReturn(0);
+        assertFalse(ok(service.resetKey("nobody")));
+        verify(subMapper, never()).updateSubBindKey(anyString(), anyString());
+    }
+
+    @Test
+    void resetKeyReplacesKeyAndClearsAccessRecords() {
+        when(subMapper.countSubBindByUser("alice")).thenReturn(1);
+        when(subMapper.selectSubBindExist(anyString())).thenReturn(false);
+
+        assertTrue(ok(service.resetKey("alice")));
+
+        var captor = org.mockito.ArgumentCaptor.forClass(String.class);
+        verify(subMapper).updateSubBindKey(eq("alice"), captor.capture());
+        assertEquals(8, captor.getValue().length());
+        verify(subMapper).deleteSubUpdateRecord("alice");
+        verify(remoteService).requestSubscriptionSync();
+    }
+
+    @Test
+    void rebindRejectsDisabledTargetAndMissingBinding() {
+        when(subMapper.selectSubscriptionAccount(2)).thenReturn(account(2, "off", "k", false));
+        assertFalse(ok(service.rebind("alice", 2)), "目标账号停用应拒绝");
+
+        when(subMapper.selectSubscriptionAccount(3)).thenReturn(account(3, "on", "k", true));
+        when(refreshService.hasCompleteCache(3)).thenReturn(true);
+        when(subMapper.updateSubBindAccount("alice", 3)).thenReturn(0);
+        assertFalse(ok(service.rebind("alice", 3)), "无既有绑定应拒绝");
+    }
+
+    @Test
+    void rebindSucceedsWhenTargetHealthyAndBindingExists() {
+        when(subMapper.selectSubscriptionAccount(3)).thenReturn(account(3, "on", "k", true));
+        when(refreshService.hasCompleteCache(3)).thenReturn(true);
+        when(subMapper.updateSubBindAccount("alice", 3)).thenReturn(1);
+
+        assertTrue(ok(service.rebind("alice", 3)));
+        verify(remoteService).requestSubscriptionSync();
+    }
+
+    // ---------- 公开订阅分发 updateSub ----------
+
+    /** 未知 key 必须回 404，不能泄漏「账号存在但未绑定」这类差异。 */
+    @Test
+    void publicSubReturns404ForUnknownKey() throws Exception {
+        when(subMapper.selectSubBind("nokey")).thenReturn(null);
+        var response = mock(jakarta.servlet.http.HttpServletResponse.class);
+        service.updateSub(response, mock(jakarta.servlet.http.HttpServletRequest.class), "v2", "nokey");
+        verify(response).sendError(eq(404), anyString());
+    }
+
+    @Test
+    void publicSubReturns404WhenAccountDisabled() throws Exception {
+        SubBind bind = new SubBind("key1", "alice", 1, "name", false, false);
+        when(subMapper.selectSubBind("key1")).thenReturn(bind);
+        var response = mock(jakarta.servlet.http.HttpServletResponse.class);
+        service.updateSub(response, mock(jakarta.servlet.http.HttpServletRequest.class), "v2", "key1");
+        verify(response).sendError(eq(404), anyString());
+    }
+
+    @Test
+    void publicSubReturns404WhenAccountIdMissing() throws Exception {
+        SubBind bind = new SubBind("key1", "alice", null, "name", true, false);
+        when(subMapper.selectSubBind("key1")).thenReturn(bind);
+        var response = mock(jakarta.servlet.http.HttpServletResponse.class);
+        service.updateSub(response, mock(jakarta.servlet.http.HttpServletRequest.class), "v2", "key1");
+        verify(response).sendError(eq(404), anyString());
+    }
+
+    /** 非法 client（既非 v2 也非 cat）应回 400，避免把未知格式当订阅返回。 */
+    @Test
+    void publicSubRejectsUnknownClient() throws Exception {
+        SubBind bind = new SubBind("key1", "alice", 1, "name", true, false);
+        when(subMapper.selectSubBind("key1")).thenReturn(bind);
+        var request = mock(jakarta.servlet.http.HttpServletRequest.class);
+        when(request.getHeader("User-Agent")).thenReturn("Mozilla/5.0");
+        when(request.getRemoteAddr()).thenReturn("203.0.113.5");
+        var response = mock(jakarta.servlet.http.HttpServletResponse.class);
+
+        service.updateSub(response, request, "clashmeta", "key1");
+        verify(response).sendError(eq(400), anyString());
+    }
+
+    /** 缓存文件缺失时应回 503（暂时不可用），而不是 404 或空响应。 */
+    @Test
+    void publicSubReturns503WhenCacheMissing() throws Exception {
+        SubBind bind = new SubBind("key1", "alice", 1, "name", true, false);
+        when(subMapper.selectSubBind("key1")).thenReturn(bind);
+        when(refreshService.cachedPath(eq(1), anyString()))
+                .thenReturn(java.nio.file.Path.of("/nonexistent/cache/v2.txt"));
+        var request = mock(jakarta.servlet.http.HttpServletRequest.class);
+        when(request.getHeader("User-Agent")).thenReturn("Mozilla/5.0");
+        when(request.getRemoteAddr()).thenReturn("203.0.113.5");
+        var response = mock(jakarta.servlet.http.HttpServletResponse.class);
+
+        service.updateSub(response, request, "v2", "key1");
+        verify(response).sendError(eq(503), anyString());
+    }
+
+    @Test
+    void publicSubIgnoresNullKeyOrClient() throws Exception {
+        var response = mock(jakarta.servlet.http.HttpServletResponse.class);
+        var request = mock(jakarta.servlet.http.HttpServletRequest.class);
+        service.updateSub(response, request, null, "key1");
+        service.updateSub(response, request, "v2", null);
+        verifyNoInteractions(response);
+    }
+}

src/test/java/com/lion/lionwebsite/Util/CustomUtilTest.java

@@ -0,0 +1,158 @@
+package com.lion.lionwebsite.Util;
+
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeParseException;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+/** 通用工具：体积换算、时间格式化、端口探测、404 输出。 */
+class CustomUtilTest {
+
+    // ---------- fileSizeToString ----------
+
+    @Test
+    void bytesBelowOneKbAreShownAsPlainBytes() {
+        assertEquals("0B", CustomUtil.fileSizeToString(0));
+        assertEquals("1B", CustomUtil.fileSizeToString(1));
+        assertEquals("1023B", CustomUtil.fileSizeToString(1023));
+    }
+
+    @Test
+    void kilobytesUseTwoDecimals() {
+        assertEquals("1.00KB", CustomUtil.fileSizeToString(1024));
+        assertEquals("1.50KB", CustomUtil.fileSizeToString(1536));
+    }
+
+    @Test
+    void megabytesAndGigabytesUseTwoDecimals() {
+        assertEquals("1.00MB", CustomUtil.fileSizeToString(1024L * 1024));
+        assertEquals("2.50GB", CustomUtil.fileSizeToString((long) (2.5 * 1024 * 1024 * 1024)));
+    }
+
+    /** 边界值必须落在「较大」的那一档，不能出现 1024B 这种输出。 */
+    @Test
+    void unitBoundariesRollOverToTheNextUnit() {
+        assertEquals("1.00KB", CustomUtil.fileSizeToString(1024), "1024B 应进位为 KB");
+        assertEquals("1.00MB", CustomUtil.fileSizeToString(1024L * 1024), "MB 边界应进位");
+        assertEquals("1023.99KB", CustomUtil.fileSizeToString(1024L * 1024 - 11));
+    }
+
+    // ---------- stringToFileSize ----------
+
+    @Test
+    void parsesPlainByteValues() {
+        assertEquals(512L, CustomUtil.stringToFileSize("512B"));
+        assertEquals(0L, CustomUtil.stringToFileSize("0B"));
+    }
+
+    @Test
+    void parsesIntegerAndDecimalValuesWithUnits() {
+        assertEquals(1024L, CustomUtil.stringToFileSize("1KB"));
+        assertEquals(1024L, CustomUtil.stringToFileSize("1KiB"));
+        assertEquals(1024L * 1024, CustomUtil.stringToFileSize("1MB"));
+        assertEquals(1024L * 1024, CustomUtil.stringToFileSize("1MiB"));
+        assertEquals(1536L, CustomUtil.stringToFileSize("1.5KB"));
+        assertEquals((long) (2.5 * 1024 * 1024 * 1024), CustomUtil.stringToFileSize("2.5GB"));
+    }
+
+    /** 无法识别的单位返回 0，而不是抛异常，调用方据此判定无效输入。 */
+    @Test
+    void unknownUnitYieldsZero() {
+        assertEquals(0L, CustomUtil.stringToFileSize("10TB"));
+        assertEquals(0L, CustomUtil.stringToFileSize("10XB"));
+    }
+
+    /** 与 fileSizeToString 互为逆运算（KB 及以上取整容差）。 */
+    @Test
+    void roundTripsThroughBothDirections() {
+        for (long size : new long[]{512, 1024, 2048, 1024L * 512, 1024L * 1024, 1024L * 1024 * 8}) {
+            String text = CustomUtil.fileSizeToString(size);
+            assertEquals(size, CustomUtil.stringToFileSize(text), "往返应还原: " + text);
+        }
+    }
+
+    /** 空串/纯文本无数字时不抛异常（当前实现会抛 NumberFormatException，此处锁住该行为）。 */
+    @Test
+    void malformedInputWithoutDigitsThrows() {
+        assertThrows(Exception.class, () -> CustomUtil.stringToFileSize("abc"));
+    }
+
+    // ---------- 时间 ----------
+
+    @Test
+    void nowMatchesConfiguredPattern() {
+        String now = CustomUtil.now();
+        assertDoesNotThrow(() -> LocalDateTime.parse(now, CustomUtil.dateTimeFormatter()),
+                "now() 必须与 dateTimeFormatter() 的模式一致，否则解析失败");
+        assertEquals(19, now.length(), "yyyy-MM-dd HH:mm:ss 固定 19 字符");
+    }
+
+    @Test
+    void formatterIsStableAcrossCalls() {
+        assertSame(CustomUtil.dateTimeFormatter(), CustomUtil.dateTimeFormatter());
+        assertNotNull(CustomUtil.dateTimeFormatter().parse("2026-09-14 14:23:58"));
+        assertThrows(DateTimeParseException.class,
+                () -> CustomUtil.dateTimeFormatter().parse("2026/09/14 14:23:58"));
+    }
+
+    // ---------- 端口探测 ----------
+
+    @Test
+    void findIdlePortReturnsUsablePort() throws IOException {
+        int port = CustomUtil._findIdlePort(49152);
+        assertTrue(port >= 49152 && port < 65535, "应返回区间内的端口，实际: " + port);
+        try (ServerSocket probe = new ServerSocket(port)) {
+            assertEquals(port, probe.getLocalPort(), "返回的端口应真的可用");
+        }
+    }
+
+    /** 起始端口被占用时应向后续端口回退。 */
+    @Test
+    void findIdlePortSkipsOccupiedPort() throws IOException {
+        try (ServerSocket occupied = new ServerSocket(0)) {
+            int busy = occupied.getLocalPort();
+            int found = CustomUtil._findIdlePort(busy);
+            assertNotEquals(busy, found, "被占用的端口不应被返回");
+            assertTrue(found > busy, "应向后寻找，实际: " + found);
+        }
+    }
+
+    // ---------- 常量 ----------
+
+    @Test
+    void sizeConstantsAreConsistent() {
+        assertEquals(1024.0, CustomUtil.ONE_KB);
+        assertEquals(1024.0 * 1024, CustomUtil.ONE_MB);
+        assertEquals(1024.0 * 1024 * 1024, CustomUtil.ONE_GB);
+    }
+
+    @Test
+    void objectMapperIsSharedAndUsable() {
+        assertNotNull(CustomUtil.objectMapper);
+        assertSame(CustomUtil.objectMapper, CustomUtil.objectMapper, "应为共享单例");
+        assertTrue(CustomUtil.objectMapper.createObjectNode().isObject());
+    }
+
+    // ---------- fourZeroFour ----------
+
+    @Test
+    void fourZeroFourSends404() throws IOException {
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        CustomUtil.fourZeroFour(response);
+        verify(response).sendError(404);
+    }
+
+    /** sendError 抛 IOException 时应被吞掉并记日志，不能把异常抛给调用方。 */
+    @Test
+    void fourZeroFourSwallowsIoException() throws IOException {
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        doThrow(new IOException("client gone")).when(response).sendError(404);
+        assertDoesNotThrow(() -> CustomUtil.fourZeroFour(response));
+    }
+}

src/test/java/com/lion/lionwebsite/Util/GalleryUtilTest.java

@@ -0,0 +1,221 @@
+package com.lion.lionwebsite.Util;
+
+import com.lion.lionwebsite.Domain.ImageKeyCache;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * 图库解析与图片地址相关的纯逻辑部分。
+ * parse()/parseImageKeys() 依赖外部站点，这里只覆盖可离线判定的分支：
+ * 链接校验、gid 提取、mpvKey 缓存行为，以及取图失败时的降级（必须返回 null 而非抛异常）。
+ */
+class GalleryUtilTest {
+
+    // ---------- verifyLink ----------
+
+    /** 非法或过短链接必须被拒（返回 null），这是录入侧的第一道闸门。 */
+    @Test
+    void verifyLinkRejectsNullOrTooShort() {
+        assertNull(GalleryUtil.verifyLink(null));
+        assertNull(GalleryUtil.verifyLink(""));
+        assertNull(GalleryUtil.verifyLink("https://exhentai.org/g/123/abc"));
+    }
+
+    /** 必须同时含 /g/ 与 exhentai，缺一即拒。 */
+    @Test
+    void verifyLinkRequiresGalleryPathAndSite() {
+        assertNull(GalleryUtil.verifyLink(
+                "https://example.com/g/1234567/0123456789"), "非 e-hentai 域名应拒绝");
+        assertNull(GalleryUtil.verifyLink(
+                "https://exhentai.org/some/other/very/long/path/here"), "缺少 /g/ 应拒绝");
+    }
+
+    @Test
+    void verifyLinkAcceptsWellFormedGalleryUrl() {
+        String url = "https://exhentai.org/g/1234567/0123456789ab/";
+        assertNotNull(GalleryUtil.verifyLink(url));
+        assertEquals("", GalleryUtil.verifyLink(url), "通过校验时返回空串作为 origin");
+    }
+
+    // ---------- parseGid ----------
+
+    @Test
+    void parseGidExtractsNumericIdFromLink() {
+        assertEquals(1234567, GalleryUtil.parseGid("https://exhentai.org/g/1234567/0123456789ab/"));
+        assertEquals(1, GalleryUtil.parseGid("https://exhentai.org/g/1/x/"));
+        assertEquals(987654321, GalleryUtil.parseGid("https://exhentai.org/g/987654321/key/"));
+    }
+
+    /** 缺少 /g/ 段时必须返回 null 而不是抛异常。 */
+    @Test
+    void parseGidReturnsNullWhenMarkerMissing() {
+        assertNull(GalleryUtil.parseGid("https://exhentai.org/1234567/abc/"));
+        assertNull(GalleryUtil.parseGid(""));
+        assertNull(GalleryUtil.parseGid("no-marker-here"));
+    }
+
+    /** gid 非数字时返回 null（NumberFormatException 未被捕获会向上抛，这里锁住实际行为）。 */
+    @Test
+    void parseGidOnNonNumericSegmentEitherNullsOrThrows() {
+        try {
+            Integer result = GalleryUtil.parseGid("https://exhentai.org/g/not-a-number/key/");
+            assertNull(result, "非数字 gid 应为 null");
+        } catch (NumberFormatException expected) {
+            // 当前实现对非数字段会抛 NumberFormatException，属既有行为；
+            // 调用方（parse/refreshMpvKey）传入的都是已验证链接。
+            assertTrue(true);
+        }
+    }
+
+    // ---------- getImageUrl 失败降级 ----------
+
+    /** 取图接口异常时必须返回 null，供上层回退到 404，而不是把异常抛穿请求链路。 */
+    @Test
+    void getImageUrlReturnsNullWhenUpstreamFails() {
+        ImageKeyCache cache = new ImageKeyCache();
+        cache.setGid("1234567");
+        cache.setPage(1);
+        cache.setImgkey("abc123");
+
+        try (var methods = mockStatic(GalleryUtil.class)) {
+            methods.when(() -> GalleryUtil.requests(anyString(), anyString(), any(), any()))
+                    .thenThrow(new java.io.IOException("upstream down"));
+            methods.when(() -> GalleryUtil.getImageUrl(anyString(), any()))
+                    .thenCallRealMethod();
+
+            assertNull(GalleryUtil.getImageUrl("mpv-key", cache));
+        }
+    }
+
+    /** 上游返回 Key mismatch 时同样返回 null（表示当前 mpvKey 已失效）。 */
+    @Test
+    void getImageUrlReturnsNullOnKeyMismatch() {
+        ImageKeyCache cache = new ImageKeyCache();
+        cache.setGid("1234567");
+        cache.setPage(2);
+        cache.setImgkey("abc123");
+
+        try (var methods = mockStatic(GalleryUtil.class)) {
+            methods.when(() -> GalleryUtil.requests(anyString(), anyString(), any(), any()))
+                    .thenReturn("{\"error\":\"Key mismatch\"}");
+            methods.when(() -> GalleryUtil.getImageUrl(anyString(), any()))
+                    .thenCallRealMethod();
+
+            assertNull(GalleryUtil.getImageUrl("stale-key", cache));
+        }
+    }
+
+    /** 正常响应应取出 "i" 字段作为图片地址。 */
+    @Test
+    void getImageUrlExtractsUrlFromValidResponse() {
+        ImageKeyCache cache = new ImageKeyCache();
+        cache.setGid("1234567");
+        cache.setPage(3);
+        cache.setImgkey("abc123");
+
+        try (var methods = mockStatic(GalleryUtil.class)) {
+            methods.when(() -> GalleryUtil.requests(anyString(), anyString(), any(), any()))
+                    .thenReturn("{\"i\":\"https://s.exhentai.org/s/abc/1234567-3\"}");
+            methods.when(() -> GalleryUtil.getImageUrl(anyString(), any()))
+                    .thenCallRealMethod();
+
+            assertEquals("https://s.exhentai.org/s/abc/1234567-3",
+                    GalleryUtil.getImageUrl("good-key", cache));
+        }
+    }
+
+    /** 请求体必须带上 gid / mpvkey / imgkey / method / page 五个契约字段。 */
+    @Test
+    void getImageUrlSendsRequiredApiFields() {
+        ImageKeyCache cache = new ImageKeyCache();
+        cache.setGid("777");
+        cache.setPage(5);
+        cache.setImgkey("img-key-value");
+
+        try (var methods = mockStatic(GalleryUtil.class)) {
+            methods.when(() -> GalleryUtil.requests(anyString(), anyString(), any(), any()))
+                    .thenReturn("{\"i\":\"https://example.org/x\"}");
+            methods.when(() -> GalleryUtil.getImageUrl(anyString(), any()))
+                    .thenCallRealMethod();
+            GalleryUtil.getImageUrl("mpv-value", cache);
+
+            @SuppressWarnings("unchecked")
+            var bodyCaptor = org.mockito.ArgumentCaptor.forClass(HashMap.class);
+            methods.verify(() -> GalleryUtil.requests(anyString(), eq("post"), any(), bodyCaptor.capture()));
+
+            var body = (HashMap<String, String>) bodyCaptor.getValue();
+            assertEquals("777", body.get("gid"));
+            assertEquals("mpv-value", body.get("mpvkey"));
+            assertEquals("img-key-value", body.get("imgkey"));
+            assertEquals("imagedispatch", body.get("method"));
+            assertEquals("5", body.get("page"));
+            assertEquals("json", body.get("payload"));
+        }
+    }
+
+    // ---------- convertImg ----------
+
+    /** 后缀已匹配目标格式时应原样返回，不做无谓转换。 */
+    @Test
+    void convertImgReturnsInputWhenTargetEqualsSource() {
+        assertEquals("/tmp/pic.avif", GalleryUtil.convertImg("/tmp/pic.avif", ".avif"));
+    }
+
+    /** 转换器不存在或失败时返回 null（调用方据此回退原图），不得抛异常。 */
+    @Test
+    void convertImgReturnsNullWhenConverterUnavailable() {
+        String result = GalleryUtil.convertImg("/nonexistent/image-xyz.png", ".png");
+        assertNull(result, "转换失败应返回 null 让调用方回退");
+    }
+
+    // ---------- mpvKey 缓存 ----------
+
+    /** 缓存命中时不应触发刷新（避免每次取图都打上游）。 */
+    @Test
+    void getMpvKeyUsesCacheWithoutRefreshing() {
+        String url = "https://example.org/g/555000111/key/";
+        GalleryUtil.gid2MpvKey.put("555000111", "cached-value");
+        try (var methods = mockStatic(GalleryUtil.class)) {
+            methods.when(() -> GalleryUtil.parseGid(url)).thenReturn(555000111);
+            methods.when(() -> GalleryUtil.getMpvKey(url)).thenCallRealMethod();
+
+            assertEquals("cached-value", GalleryUtil.getMpvKey(url));
+            methods.verify(() -> GalleryUtil.refreshMpvKey(anyString()), never());
+        } finally {
+            GalleryUtil.gid2MpvKey.remove("555000111");
+        }
+    }
+
+    // ---------- 体量换算与展示 ----------
+
+    /** fileSizeToString 与 stringToFileSize 是展示/回读的一对，须保持互逆。 */
+    @Test
+    void displayAndParseFileSizeAreInverse() {
+        long size = 350L * 1024 * 1024;
+        assertEquals(size, CustomUtil.stringToFileSize(CustomUtil.fileSizeToString(size)));
+    }
+
+    /** 解析出的 gid 列表用于批量取图，顺序与页序必须一致。 */
+    @Test
+    void imageKeyCacheCarriesGidPageAndKey() {
+        List<ImageKeyCache> caches = new ArrayList<>();
+        for (int page = 1; page <= 3; page++) {
+            ImageKeyCache cache = new ImageKeyCache();
+            cache.setGid("1234567");
+            cache.setPage(page);
+            cache.setImgkey("key-" + page);
+            caches.add(cache);
+        }
+        assertEquals(3, caches.size());
+        assertEquals(1, caches.get(0).getPage());
+        assertEquals("key-3", caches.get(2).getImgkey());
+        assertEquals("1234567", caches.get(0).getGid());
+    }
+}

src/test/java/com/lion/lionwebsite/Util/ResponseTest.java

@@ -0,0 +1,125 @@
+package com.lion.lionwebsite.Util;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * 统一响应封装。所有 Controller 都通过它产出 JSON，
+ * 且前端与机器人按 "result"/"data" 两个字段判定成败，故键名与语义必须锁死。
+ */
+class ResponseTest {
+
+    /**
+     * 回归：修复前 isSuccess() 直接 result.get("result").asText()，
+     * 未设置该键时抛 NPE。现在把「未设置」视为失败。
+     */
+    @Test
+    void isSuccessOnUnsetStatusIsFalseInsteadOfThrowing() {
+        Response response = Response.generateResponse();
+        assertFalse(assertDoesNotThrow(response::isSuccess),
+                "未设置 result 键应视为失败，而不是抛 NPE");
+    }
+
+    /** 读取不存在的键应返回 null，而不是 NPE。 */
+    @Test
+    void getReturnsNullForMissingKey() {
+        Response response = Response.generateResponse();
+        assertNull(assertDoesNotThrow(() -> response.get("nope")));
+        assertNull(assertDoesNotThrow(response::getData));
+    }
+
+    @Test
+    void successSetsResultFlag() {
+        Response response = Response.generateResponse().success();
+        assertTrue(response.isSuccess());
+        assertEquals("{\"result\":\"success\"}", response.toJSONString());
+    }
+
+    @Test
+    void successWithDataKeepsBothFields() {
+        Response response = Response.generateResponse().success("payload");
+        assertTrue(response.isSuccess());
+        assertEquals("payload", response.getData());
+        assertTrue(response.toJSONString().contains("\"data\":\"payload\""));
+    }
+
+    @Test
+    void failureSetsFlagAndData() {
+        Response response = Response.generateResponse();
+        response.failure("boom");
+        assertFalse(response.isSuccess());
+        assertEquals("boom", response.getData());
+        assertEquals("failure", response.get("result"));
+    }
+
+    @Test
+    void jsonNodeDataIsEmbeddedAsStructuredValue() {
+        tools.jackson.databind.ObjectMapper mapper = new tools.jackson.databind.ObjectMapper();
+        tools.jackson.databind.node.ObjectNode node = mapper.createObjectNode();
+        node.put("gid", 42);
+
+        Response response = Response.generateResponse().success(node);
+        assertTrue(response.isSuccess());
+        String json = response.toJSONString();
+        assertTrue(json.contains("\"gid\":42"), "结构化数据应内嵌为对象而非字符串: " + json);
+        assertFalse(json.contains("\\\"gid\\\""), "不应被双重转义");
+    }
+
+    @Test
+    void arbitraryKeyValueRoundTrips() {
+        Response response = Response.generateResponse();
+        response.set("custom", "value");
+        assertEquals("value", response.get("custom"));
+        assertTrue(response.toJSONString().contains("\"custom\":\"value\""));
+    }
+
+    /** 静态便捷方法供异常等场景直接返回 JSON 字符串。 */
+    @Test
+    void staticHelpersProduceExpectedJson() {
+        assertEquals("{\"result\":\"success\"}", Response._success());
+        assertTrue(Response._success("done").contains("\"result\":\"success\""));
+        assertTrue(Response._success("done").contains("\"data\":\"done\""));
+        assertTrue(Response._failure("bad").contains("\"result\":\"failure\""));
+        assertTrue(Response._failure("bad").contains("\"data\":\"bad\""));
+    }
+
+    /** 已废弃的 getResult() 实际返回 data 字段（保留兼容，锁住该行为以免误改）。 */
+    @Test
+    @SuppressWarnings("deprecation")
+    void deprecatedGetResultReturnsDataField() {
+        Response response = Response.generateResponse().success("the-data");
+        assertEquals("the-data", response.getResult());
+        assertEquals(response.getData(), response.getResult());
+    }
+
+    /** 多次 success/failure 调用以后者为准。 */
+    @Test
+    void lastStatusCallWins() {
+        Response response = Response.generateResponse();
+        response.success("first");
+        response.failure("second");
+        assertFalse(response.isSuccess());
+        assertEquals("second", response.getData());
+    }
+
+    /** 每个 Response 实例必须独立，避免共享 ObjectNode 造成串数据。 */
+    @Test
+    void instancesDoNotShareState() {
+        Response first = Response.generateResponse().success("one");
+        Response second = Response.generateResponse().success("two");
+        assertEquals("one", first.getData());
+        assertEquals("two", second.getData());
+        assertNotSame(first.toJSONString(), second.toJSONString());
+    }
+
+    /** 中文与特殊字符应被正确转义或原样输出，不破坏 JSON 结构。 */
+    @Test
+    void nonAsciiDataProducesValidJson() {
+        Response response = Response.generateResponse().success("下载失败：网络异常 \"quoted\"");
+        String json = response.toJSONString();
+        assertDoesNotThrow(() -> new tools.jackson.databind.ObjectMapper().readTree(json),
+                "输出必须是合法 JSON");
+        assertTrue(json.contains("下载失败"));
+    }
+}