feat：【ai 大模型】对话增加附件的支持

yudao-module-ai/src/main/java/cn/iocoder/yudao/module/ai/controller/admin/chat/AiChatMessageController.http

@@ -20,6 +20,30 @@ tenant-id: {{adminTenantId}}
   "content": "1+1=?"
 }
 
+### 发送消息（流式）【带文件】
+POST {{baseUrl}}/ai/chat/message/send-stream
+Content-Type: application/json
+Authorization: {{token}}
+tenant-id: {{adminTenantId}}
+
+{
+  "conversationId": "1781604279872581797",
+  "content": "图片里有什么？",
+  "attachmentUrls": ["http://test.yudao.iocoder.cn/1755531278.jpeg"]
+}
+
+### 发送消息（流式）【追问带文件】
+POST {{baseUrl}}/ai/chat/message/send-stream
+Content-Type: application/json
+Authorization: {{token}}
+tenant-id: {{adminTenantId}}
+
+{
+  "conversationId": "1781604279872581797",
+  "content": "说下图片里，有哪些字？",
+  "useContext": true
+}
+
 ### 获得指定对话的消息列表
 GET {{baseUrl}}/ai/chat/message/list-by-conversation-id?conversationId=1781604279872581649
 Authorization: {{token}}

yudao-module-ai/src/main/java/cn/iocoder/yudao/module/ai/controller/admin/chat/vo/message/AiChatMessageRespVO.java

@@ -49,6 +49,9 @@ public class AiChatMessageRespVO {
     @Schema(description = "知识库段落数组")
     private List<KnowledgeSegment> segments;
 
+    @Schema(description = "附件 URL 数组", example = "https://www.iocoder.cn/1.png")
+    private List<String> attachmentUrls;
+
     @Schema(description = "创建时间", requiredMode = Schema.RequiredMode.REQUIRED, example = "2024-05-12 12:51")
     private LocalDateTime createTime;
 

yudao-module-ai/src/main/java/cn/iocoder/yudao/module/ai/controller/admin/chat/vo/message/AiChatMessageSendReqVO.java

@@ -3,9 +3,9 @@ package cn.iocoder.yudao.module.ai.controller.admin.chat.vo.message;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Size;
 import lombok.Data;
-import lombok.experimental.Accessors;
+
+import java.util.List;
 
 @Schema(description = "管理后台 - AI 聊天消息发送 Request VO")
 @Data
@@ -22,4 +22,7 @@ public class AiChatMessageSendReqVO {
     @Schema(description = "是否携带上下文", example = "true")
     private Boolean useContext;
 
+    @Schema(description = "附件 URL 数组", example = "https://www.iocoder.cn/1.png")
+    private List<String> attachmentUrls;
+
 }

yudao-module-ai/src/main/java/cn/iocoder/yudao/module/ai/dal/dataobject/chat/AiChatMessageDO.java

@@ -2,6 +2,7 @@ package cn.iocoder.yudao.module.ai.dal.dataobject.chat;
 
 import cn.iocoder.yudao.framework.mybatis.core.dataobject.BaseDO;
 import cn.iocoder.yudao.framework.mybatis.core.type.LongListTypeHandler;
+import cn.iocoder.yudao.framework.mybatis.core.type.StringListTypeHandler;
 import cn.iocoder.yudao.module.ai.dal.dataobject.knowledge.AiKnowledgeSegmentDO;
 import cn.iocoder.yudao.module.ai.dal.dataobject.model.AiChatRoleDO;
 import cn.iocoder.yudao.module.ai.dal.dataobject.model.AiModelDO;
@@ -105,4 +106,10 @@ public class AiChatMessageDO extends BaseDO {
     @TableField(typeHandler = LongListTypeHandler.class)
     private List<Long> segmentIds;
 
+    /**
+     * 附件 URL 数组
+     */
+    @TableField(typeHandler = StringListTypeHandler.class)
+    private List<String> attachmentUrls;
+
 }

yudao-module-ai/src/main/java/cn/iocoder/yudao/module/ai/service/chat/AiChatMessageServiceImpl.java

@@ -1,8 +1,11 @@
 package cn.iocoder.yudao.module.ai.service.chat;
 
+import cn.hutool.core.codec.Base64;
 import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.io.file.FileNameUtil;
 import cn.hutool.core.util.ObjUtil;
 import cn.hutool.core.util.StrUtil;
+import cn.hutool.http.HttpUtil;
 import cn.iocoder.yudao.framework.common.pojo.CommonResult;
 import cn.iocoder.yudao.framework.common.pojo.PageResult;
 import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
@@ -28,6 +31,8 @@ import cn.iocoder.yudao.module.ai.service.model.AiChatRoleService;
 import cn.iocoder.yudao.module.ai.service.model.AiModelService;
 import cn.iocoder.yudao.module.ai.service.model.AiToolService;
 import cn.iocoder.yudao.module.ai.util.AiUtils;
+import cn.iocoder.yudao.module.infra.framework.file.core.utils.FileTypeUtils;
+import com.google.common.collect.Maps;
 import jakarta.annotation.Resource;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.ai.chat.messages.Message;
@@ -64,6 +69,8 @@ import static cn.iocoder.yudao.module.ai.enums.ErrorCodeConstants.CHAT_MESSAGE_N
 @Slf4j
 public class AiChatMessageServiceImpl implements AiChatMessageService {
 
+    // TODO @芋艿：后续优化下对话的 Prompt 整体结构
+
     /**
      * 知识库转 {@link UserMessage} 的内容模版
      */
@@ -71,6 +78,14 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
             "%s\n\n" + // 多个 <Reference></Reference> 的拼接
             "回答要求：\n- 避免提及你是从 <Reference></Reference> 获取的知识。";
 
+    /**
+     * 附件转 ${@link UserMessage} 的内容模版
+     */
+    @SuppressWarnings("TextBlockMigration")
+    private static final String Attachment_USER_MESSAGE_TEMPLATE = "使用 <Attachment></Attachment> 标记用户对话上传的附件内容:\n\n" +
+            "%s\n\n" + // 多个 <Attachment></Attachment> 的拼接
+            "回答要求：\n- 避免提及 <Attachment></Attachment> 附件的编码格式。";
+
     @Resource
     private AiChatMessageMapper chatMessageMapper;
 
@@ -101,17 +116,18 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
         ChatModel chatModel = modalService.getChatModel(model.getId());
 
         // 2. 知识库找回
-        List<AiKnowledgeSegmentSearchRespBO> knowledgeSegments = recallKnowledgeSegment(sendReqVO.getContent(), conversation);
+        List<AiKnowledgeSegmentSearchRespBO> knowledgeSegments = recallKnowledgeSegment(
+                sendReqVO.getContent(), conversation);
 
         // 3. 插入 user 发送消息
         AiChatMessageDO userMessage = createChatMessage(conversation.getId(), null, model,
                 userId, conversation.getRoleId(), MessageType.USER, sendReqVO.getContent(), sendReqVO.getUseContext(),
-                null);
+                null, sendReqVO.getAttachmentUrls());
 
         // 3.1 插入 assistant 接收消息
         AiChatMessageDO assistantMessage = createChatMessage(conversation.getId(), userMessage.getId(), model,
                 userId, conversation.getRoleId(), MessageType.ASSISTANT, "", sendReqVO.getUseContext(),
-                knowledgeSegments);
+                knowledgeSegments, null);
 
         // 3.2 创建 chat 需要的 Prompt
         Prompt prompt = buildPrompt(conversation, historyMessages, knowledgeSegments, model, sendReqVO);
@@ -151,18 +167,18 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
         StreamingChatModel chatModel = modalService.getChatModel(model.getId());
 
         // 2. 知识库找回
-        List<AiKnowledgeSegmentSearchRespBO> knowledgeSegments = recallKnowledgeSegment(sendReqVO.getContent(),
-                conversation);
+        List<AiKnowledgeSegmentSearchRespBO> knowledgeSegments = recallKnowledgeSegment(
+                sendReqVO.getContent(), conversation);
 
         // 3. 插入 user 发送消息
         AiChatMessageDO userMessage = createChatMessage(conversation.getId(), null, model,
                 userId, conversation.getRoleId(), MessageType.USER, sendReqVO.getContent(), sendReqVO.getUseContext(),
-                null);
+                null, sendReqVO.getAttachmentUrls());
 
         // 4.1 插入 assistant 接收消息
         AiChatMessageDO assistantMessage = createChatMessage(conversation.getId(), userMessage.getId(), model,
                 userId, conversation.getRoleId(), MessageType.ASSISTANT, "", sendReqVO.getUseContext(),
-                knowledgeSegments);
+                knowledgeSegments, null);
 
         // 4.2 构建 Prompt，并进行调用
         Prompt prompt = buildPrompt(conversation, historyMessages, knowledgeSegments, model, sendReqVO);
@@ -243,8 +259,13 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
 
         // 1.2 历史 history message 历史消息
         List<AiChatMessageDO> contextMessages = filterContextMessages(messages, conversation, sendReqVO);
-        contextMessages
-                .forEach(message -> chatMessages.add(AiUtils.buildMessage(message.getType(), message.getContent())));
+        contextMessages.forEach(message -> {
+            chatMessages.add(AiUtils.buildMessage(message.getType(), message.getContent()));
+            UserMessage attachmentUserMessage = buildAttachmentUserMessage(message.getAttachmentUrls());
+            if (attachmentUserMessage != null) {
+                chatMessages.add(attachmentUserMessage);
+            }
+        });
 
         // 1.3 当前 user message 新发送消息
         chatMessages.add(new UserMessage(sendReqVO.getContent()));
@@ -257,6 +278,14 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
             chatMessages.add(new UserMessage(String.format(KNOWLEDGE_USER_MESSAGE_TEMPLATE, reference)));
         }
 
+        // 1.5 附件，通过 UserMessage 实现
+        if (CollUtil.isNotEmpty(sendReqVO.getAttachmentUrls())) {
+            UserMessage attachmentUserMessage = buildAttachmentUserMessage(sendReqVO.getAttachmentUrls());
+            if (attachmentUserMessage != null) {
+                chatMessages.add(attachmentUserMessage);
+            }
+        }
+
         // 2.1 查询 tool 工具
         Set<String> toolNames = null;
         Map<String,Object> toolContext = Map.of();
@@ -314,14 +343,52 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
         return contextMessages;
     }
 
+    private UserMessage buildAttachmentUserMessage(List<String> attachmentUrls) {
+        if (CollUtil.isEmpty(attachmentUrls)) {
+            return null;
+        }
+        // 读取文件内容
+        Map<String, String> attachmentContents = Maps.newLinkedHashMapWithExpectedSize(attachmentUrls.size());
+        for (String attachmentUrl : attachmentUrls) {
+            try {
+                String name = FileNameUtil.getName(attachmentUrl);
+                String mineType = FileTypeUtils.getMineType(name);
+                String content;
+                if (FileTypeUtils.isImage(mineType)) {
+                    // 特殊：图片则转为 Base64
+                    byte[] bytes = HttpUtil.downloadBytes(attachmentUrl);
+                    content = Base64.encode(bytes);
+                } else {
+                    content = knowledgeDocumentService.readUrl(attachmentUrl);
+                }
+                if (StrUtil.isNotEmpty(content)) {
+                    attachmentContents.put(name, content);
+                }
+            } catch (Exception e) {
+                log.error("[buildAttachmentUserMessage][读取附件({}) 发生异常]", attachmentUrl, e);
+            }
+        }
+        if (CollUtil.isEmpty(attachmentContents)) {
+            return null;
+        }
+
+        // 拼接 UserMessage 消息
+        String attachment = attachmentContents.entrySet().stream()
+                .map(entry -> "<Attachment name=\"" + entry.getKey() + "\">" + entry.getValue() + "</Attachment>")
+                .collect(Collectors.joining("\n\n"));
+        return new UserMessage(String.format(Attachment_USER_MESSAGE_TEMPLATE, attachment));
+    }
+
     private AiChatMessageDO createChatMessage(Long conversationId, Long replyId,
-            AiModelDO model, Long userId, Long roleId,
-            MessageType messageType, String content, Boolean useContext,
-            List<AiKnowledgeSegmentSearchRespBO> knowledgeSegments) {
+                                              AiModelDO model, Long userId, Long roleId,
+                                              MessageType messageType, String content, Boolean useContext,
+                                              List<AiKnowledgeSegmentSearchRespBO> knowledgeSegments,
+                                              List<String> attachmentUrls) {
         AiChatMessageDO message = new AiChatMessageDO().setConversationId(conversationId).setReplyId(replyId)
                 .setModel(model.getModel()).setModelId(model.getId()).setUserId(userId).setRoleId(roleId)
                 .setType(messageType.getValue()).setContent(content).setUseContext(useContext)
-                .setSegmentIds(convertList(knowledgeSegments, AiKnowledgeSegmentSearchRespBO::getId));
+                .setSegmentIds(convertList(knowledgeSegments, AiKnowledgeSegmentSearchRespBO::getId))
+                .setAttachmentUrls(attachmentUrls);
         message.setCreateTime(LocalDateTime.now());
         chatMessageMapper.insert(message);
         return message;