feat: access-result提交5分钟内容去重，防止mediabot重复提交

par-api/src/main/java/com/par/api/controller/AccessResultController.java

@@ -54,11 +54,14 @@ public class AccessResultController {
         String clientId = (String) request.getAttribute("clientId");
         Long submitterId = (Long) request.getAttribute("accountId");
 
-        AccessResult result = accessResultService.submit(
+        try {
-                siteId, configVersion, clientId, contentType, content,
+            AccessResult result = accessResultService.submit(
-                url, statusCode, responseTimeMs, submitterId);
+                    siteId, configVersion, clientId, contentType, content,
-
+                    url, statusCode, responseTimeMs, submitterId);
-        return ApiResponse.success(accessResultService.toDTO(result));
+            return ApiResponse.success(accessResultService.toDTO(result));
+        } catch (com.par.core.exception.DuplicateSubmissionException e) {
+            return ApiResponse.success(Map.of("skipped", true, "reason", "duplicate"));
+        }
     }
 
     // ==================== 管理员查看接口（JWT 鉴权） ====================

par-core/src/main/java/com/par/core/exception/DuplicateSubmissionException.java

@@ -0,0 +1,7 @@
+package com.par.core.exception;
+
+/**
+ * 重复提交异常：相同内容的访问结果在去重窗口内再次提交
+ */
+public class DuplicateSubmissionException extends RuntimeException {
+}

par-core/src/main/java/com/par/core/service/impl/AccessResultServiceImpl.java

@@ -11,6 +11,8 @@ import com.par.core.mapper.AccessResultMapper;
 import com.par.core.mapper.SiteConfigMapper;
 import com.par.core.mapper.SiteMapper;
 import com.par.core.service.AccessResultService;
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
 import com.par.core.storage.CachedStorageService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -19,6 +21,7 @@ import org.springframework.stereotype.Service;
 import java.sql.Timestamp;
 import java.time.LocalDateTime;
 import java.util.*;
+import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 
 @Slf4j
@@ -31,12 +34,31 @@ public class AccessResultServiceImpl implements AccessResultService {
     private final SiteMapper siteMapper;
     private final CachedStorageService storageService;
 
+    /** 去重缓存：siteId|url → contentHash，5分钟内相同内容跳过 */
+    private final Cache<String, String> dedupCache = Caffeine.newBuilder()
+            .maximumSize(10000)
+            .expireAfterWrite(5, TimeUnit.MINUTES)
+            .build();
+
     @Override
     public AccessResult submit(String siteId, String configVersion, String clientId,
                                String contentType, String content, String url,
                                Integer statusCode, Integer responseTimeMs, Long submitterId) {
         String type = (contentType != null && !contentType.isBlank()) ? contentType : "html";
         String ext = "json".equalsIgnoreCase(type) ? "json" : "html";
+
+        // 去重：5分钟内相同site+url+contentHash跳过
+        String dedupKey = siteId + "|" + (url != null ? url : "");
+        String contentHash = content.length() > 1000
+                ? Integer.toHexString(content.substring(0, 1000).hashCode())
+                : Integer.toHexString(content.hashCode());
+        String existing = dedupCache.getIfPresent(dedupKey);
+        if (contentHash.equals(existing)) {
+            log.debug("跳过重复提交: siteId={}, url={}", siteId, url);
+            throw new DuplicateSubmissionException();
+        }
+        dedupCache.put(dedupKey, contentHash);
+
         String storagePath = String.format("access-results/%s/%d_%s.%s",
                 siteId, System.currentTimeMillis(), UUID.randomUUID().toString().substring(0, 8), ext);