package cn.iocoder.yudao.module.ai.service.knowledge;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.io.FileUtil;
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import cn.hutool.core.io.IoUtil;
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import cn.hutool.core.util.ArrayUtil;
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import cn.hutool.core.util.StrUtil;
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import cn.iocoder.yudao.framework.common.enums.CommonStatusEnum;
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import cn.iocoder.yudao.framework.common.pojo.PageResult;
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import cn.iocoder.yudao.module.ai.controller.admin.knowledge.vo.document.*;
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import cn.iocoder.yudao.module.ai.controller.admin.knowledge.vo.segment.AiKnowledgeSegmentProcessRespVO;
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import cn.iocoder.yudao.module.ai.dal.dataobject.knowledge.AiKnowledgeDO;
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import cn.iocoder.yudao.module.ai.dal.dataobject.knowledge.AiKnowledgeDocumentDO;
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import cn.iocoder.yudao.module.ai.dal.dataobject.knowledge.AiKnowledgeSegmentDO;
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import cn.iocoder.yudao.module.ai.dal.dataobject.model.AiModelDO;
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import cn.iocoder.yudao.module.ai.dal.mysql.knowledge.AiKnowledgeDocumentMapper;
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import cn.iocoder.yudao.module.ai.dal.mysql.knowledge.AiKnowledgeSegmentMapper;
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import cn.iocoder.yudao.module.ai.service.model.AiModelService;
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import jakarta.annotation.Resource;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.ai.document.Document;
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import org.springframework.ai.transformer.splitter.TokenTextSplitter;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import org.apache.tika.parser.AutoDetectParser;
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import org.apache.tika.parser.ParseContext;
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import org.apache.tika.parser.Parser;
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import org.apache.tika.extractor.EmbeddedDocumentExtractor;
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import org.apache.tika.sax.BodyContentHandler;
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import org.xml.sax.ContentHandler;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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import java.net.HttpURLConnection;
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import java.net.URI;
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import java.net.URL;
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import java.net.URLEncoder;
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import java.nio.charset.StandardCharsets;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
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import static cn.iocoder.yudao.module.ai.enums.ErrorCodeConstants.*;
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@Slf4j
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@Service
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public class AiKnowledgeDocumentServiceImpl implements AiKnowledgeDocumentService {
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@Resource
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private AiKnowledgeDocumentMapper documentMapper;
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@Resource
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private AiKnowledgeSegmentMapper segmentMapper;
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@Resource
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private AiKnowledgeService knowledgeService;
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@Resource
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private AiKnowledgeSegmentService segmentService;
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@Resource
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private AiModelService modelService;
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@Override
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@Transactional(rollbackFor = Exception.class)
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public List<Long> createDocuments(AiKnowledgeDocumentCreateReqVO createReqVO) {
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AiKnowledgeDO knowledge = knowledgeService.validateKnowledge(createReqVO.getKnowledgeId());
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List<AiKnowledgeDocumentCreateReqVO.DocumentItem> list = createReqVO.getList();
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if (CollUtil.isEmpty(list)) {
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throw new IllegalArgumentException("文档列表不能为空");
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}
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int defaultSegmentMaxTokens = createReqVO.getSegmentMaxTokens() != null
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? createReqVO.getSegmentMaxTokens() : 800;
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List<Long> ids = new ArrayList<>();
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for (AiKnowledgeDocumentCreateReqVO.DocumentItem item : list) {
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AiKnowledgeDocumentCreateReqVO.UrlInfo urlInfo = item.getUrl();
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String fileUrl = urlInfo != null ? urlInfo.getUrl() : null;
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AiKnowledgeDocumentDO document = new AiKnowledgeDocumentDO();
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document.setKnowledgeId(knowledge.getId());
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document.setName(item.getName());
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document.setUrl(fileUrl);
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document.setStatus(CommonStatusEnum.ENABLE.getStatus());
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document.setSegmentMaxTokens(defaultSegmentMaxTokens);
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documentMapper.insert(document);
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ids.add(document.getId());
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if (fileUrl != null) {
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try {
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loadDocumentContent(document);
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documentMapper.updateById(document);
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// 自动执行分段和向量化
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processDocumentSegmentsInternal(document, knowledge);
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} catch (Exception e) {
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log.error("文档[{}]处理失败: {}", document.getId(), e.getMessage());
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document.setStatus(CommonStatusEnum.DISABLE.getStatus());
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documentMapper.updateById(document);
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}
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}
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}
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return ids;
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}
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private void loadDocumentContent(AiKnowledgeDocumentDO document) {
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try {
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byte[] fileBytes = downloadFile(document.getUrl());
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String content = extractText(fileBytes, document.getName());
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if (StrUtil.isEmpty(content)) {
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content = new String(fileBytes, java.nio.charset.Charset.forName("UTF-8"));
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}
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document.setContent(content);
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document.setContentLength(content.length());
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document.setTokens(estimateTokens(content));
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} catch (Exception e) {
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throw new RuntimeException("文档内容加载失败: " + e.getMessage(), e);
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}
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}
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private byte[] downloadFile(String fileUrl) {
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try {
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// 手动编码 URL 路径中的非 ASCII 字符，避免 URI 构造函数报错
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String encodedUrl = encodeUrlPath(fileUrl);
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URL url = URL.of(new URI(encodedUrl), null);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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conn.setConnectTimeout(30000);
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conn.setReadTimeout(60000);
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conn.setRequestMethod("GET");
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try (InputStream is = conn.getInputStream();
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ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
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IoUtil.copy(is, bos);
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return bos.toByteArray();
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}
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} catch (Exception e) {
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throw new RuntimeException("文件下载失败: " + e.getMessage(), e);
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}
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}
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private static String encodeUrlPath(String urlString) {
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// 分离 scheme://authority 和 path?query#fragment
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int schemeEnd = urlString.indexOf("://");
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if (schemeEnd < 0) return urlString;
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int pathStart = urlString.indexOf('/', schemeEnd + 3);
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if (pathStart < 0) return urlString; // 无 path
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String base = urlString.substring(0, pathStart);
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String pathAndRest = urlString.substring(pathStart);
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// 分离 path 和 query + fragment
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int queryStart = pathAndRest.indexOf('?');
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int fragStart = pathAndRest.indexOf('#');
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String rawPath, query, fragment;
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if (queryStart >= 0) {
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rawPath = pathAndRest.substring(0, queryStart);
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if (fragStart >= 0 && fragStart > queryStart) {
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query = pathAndRest.substring(queryStart, fragStart);
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fragment = pathAndRest.substring(fragStart);
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} else {
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query = pathAndRest.substring(queryStart);
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fragment = "";
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}
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} else if (fragStart >= 0) {
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rawPath = pathAndRest.substring(0, fragStart);
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query = "";
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fragment = pathAndRest.substring(fragStart);
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} else {
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rawPath = pathAndRest;
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query = "";
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fragment = "";
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}
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// 对路径每个段做 URL 编码
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StringBuilder encodedPath = new StringBuilder();
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for (String segment : rawPath.split("/")) {
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if (!segment.isEmpty()) {
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encodedPath.append("/").append(URLEncoder.encode(segment, StandardCharsets.UTF_8)
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.replace("+", "%20"));
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}
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}
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if (rawPath.endsWith("/")) encodedPath.append("/");
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return base + encodedPath + query + fragment;
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}
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private String extractText(byte[] fileBytes, String fileName) {
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try {
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String ext = FileUtil.extName(fileName).toLowerCase();
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if (ArrayUtil.contains(new String[]{"txt", "md", "json", "xml", "csv", "yaml", "yml"}, ext)) {
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return new String(fileBytes, StandardCharsets.UTF_8);
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}
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// 使用 AutoDetectParser + EmbeddedDocumentExtractor 跳过嵌入图片，避免提取到二进制乱码
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Parser parser = new AutoDetectParser();
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ParseContext context = new ParseContext();
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context.set(EmbeddedDocumentExtractor.class, new EmbeddedDocumentExtractor() {
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@Override
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public boolean shouldParseEmbedded(org.apache.tika.metadata.Metadata metadata) {
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return false;
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}
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@Override
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public void parseEmbedded(InputStream inputStream, ContentHandler contentHandler,
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org.apache.tika.metadata.Metadata metadata, boolean outputHtml) {
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}
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});
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BodyContentHandler handler = new BodyContentHandler(-1);
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try (InputStream is = new java.io.ByteArrayInputStream(fileBytes)) {
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parser.parse(is, handler, new org.apache.tika.metadata.Metadata(), context);
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}
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return handler.toString().trim();
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} catch (Exception e) {
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log.warn("Tika 解析文档失败，尝试 UTF-8 文本读取: {}", e.getMessage());
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return "";
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}
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}
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@Override
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@Transactional(rollbackFor = Exception.class)
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public void updateDocument(AiKnowledgeDocumentUpdateReqVO updateReqVO) {
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AiKnowledgeDocumentDO document = validateDocumentExists(updateReqVO.getId());
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boolean urlChanged = StrUtil.isNotEmpty(updateReqVO.getUrl())
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&& !updateReqVO.getUrl().equals(document.getUrl());
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if (StrUtil.isNotEmpty(updateReqVO.getName())) document.setName(updateReqVO.getName());
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if (urlChanged) document.setUrl(updateReqVO.getUrl());
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documentMapper.updateById(document);
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// URL 变更时重新提取内容、重新分段和向量化
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if (urlChanged) {
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try {
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loadDocumentContent(document);
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documentMapper.updateById(document);
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AiKnowledgeDO knowledge = knowledgeService.validateKnowledge(document.getKnowledgeId());
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// 删除旧分段和向量
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segmentService.deleteSegmentsByDocumentId(document.getId());
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// 重新分段 + 向量化
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processDocumentSegmentsInternal(document, knowledge);
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} catch (Exception e) {
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log.error("文档[{}] URL 更新后处理失败: {}", document.getId(), e.getMessage());
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document.setStatus(CommonStatusEnum.DISABLE.getStatus());
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documentMapper.updateById(document);
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}
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}
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}
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@Override
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@Transactional(rollbackFor = Exception.class)
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public void deleteDocument(Long id) {
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AiKnowledgeDocumentDO document = validateDocumentExists(id);
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segmentService.deleteSegmentsByDocumentId(id);
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documentMapper.deleteById(id);
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}
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@Override
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public AiKnowledgeDocumentDO getDocument(Long id) {
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return documentMapper.selectById(id);
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}
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@Override
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public AiKnowledgeDocumentDO validateDocumentExists(Long id) {
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AiKnowledgeDocumentDO document = documentMapper.selectById(id);
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if (document == null) throw exception(KNOWLEDGE_DOCUMENT_NOT_EXISTS);
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return document;
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}
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@Override
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public PageResult<AiKnowledgeDocumentDO> getDocumentPage(AiKnowledgeDocumentPageReqVO pageReqVO) {
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return documentMapper.selectPage(pageReqVO);
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}
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@Override
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@Transactional(rollbackFor = Exception.class)
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public void updateDocumentStatus(AiKnowledgeDocumentUpdateStatusReqVO updateStatusReqVO) {
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AiKnowledgeDocumentDO document = validateDocumentExists(updateStatusReqVO.getId());
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document.setStatus(updateStatusReqVO.getStatus());
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documentMapper.updateById(document);
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}
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@Override
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public List<AiKnowledgeSegmentProcessRespVO> getDocumentProcessingProgress(List<Long> documentIds) {
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if (CollUtil.isEmpty(documentIds)) return Collections.emptyList();
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return segmentMapper.selectProcessList(documentIds);
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}
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@Override
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public void processDocumentSegments(Long documentId) {
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AiKnowledgeDocumentDO document = validateDocumentExists(documentId);
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if (StrUtil.isEmpty(document.getContent())) {
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throw exception(KNOWLEDGE_DOCUMENT_FILE_EMPTY);
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}
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AiKnowledgeDO knowledge = knowledgeService.validateKnowledge(document.getKnowledgeId());
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processDocumentSegmentsInternal(document, knowledge);
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}
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private void processDocumentSegmentsInternal(AiKnowledgeDocumentDO document, AiKnowledgeDO knowledge) {
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if (StrUtil.isEmpty(document.getContent())) return;
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AiModelDO embeddingModel = modelService.validateModel(knowledge.getEmbeddingModelId());
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// 删除旧分段
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segmentService.deleteSegmentsByDocumentId(document.getId());
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// 文本切片
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int segmentMaxTokens = document.getSegmentMaxTokens() != null ? document.getSegmentMaxTokens() : 800;
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List<String> segmentTexts = splitContent(document.getContent(), segmentMaxTokens);
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if (CollUtil.isEmpty(segmentTexts)) return;
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// 向量化并存储
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List<AiKnowledgeSegmentDO> segments = new ArrayList<>();
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for (String content : segmentTexts) {
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if (StrUtil.isEmpty(content.trim())) continue;
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segments.add(buildSegmentDO(knowledge.getId(), document.getId(), content));
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}
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segmentService.saveSegments(segments, knowledge.getId(), embeddingModel.getId());
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}
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private List<String> splitContent(String content, int maxTokens) {
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TokenTextSplitter splitter = TokenTextSplitter.builder()
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.withChunkSize(maxTokens)
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.withMinChunkSizeChars(50)
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.withMinChunkLengthToEmbed(10)
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.withMaxNumChunks(1000)
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.withKeepSeparator(true)
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.build();
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List<Document> docs = splitter.apply(Collections.singletonList(new Document(content)));
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List<String> result = new ArrayList<>();
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for (Document doc : docs) {
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if (StrUtil.isNotEmpty(doc.getText())) {
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result.add(doc.getText().trim());
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}
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}
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return result;
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}
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@Override
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public List<String> previewSplit(String url, String name, Integer segmentMaxTokens) {
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byte[] fileBytes = downloadFile(url);
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String text = extractText(fileBytes, name);
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if (StrUtil.isEmpty(text)) {
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text = new String(fileBytes, java.nio.charset.Charset.forName("UTF-8"));
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}
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int maxTokens = segmentMaxTokens != null && segmentMaxTokens > 0 ? segmentMaxTokens : 800;
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return splitContent(text, maxTokens);
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}
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private AiKnowledgeSegmentDO buildSegmentDO(Long knowledgeId, Long documentId, String content) {
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AiKnowledgeSegmentDO segment = new AiKnowledgeSegmentDO();
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segment.setKnowledgeId(knowledgeId);
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segment.setDocumentId(documentId);
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segment.setContent(content);
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segment.setContentLength(content.length());
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segment.setTokens(estimateTokens(content));
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segment.setStatus(CommonStatusEnum.ENABLE.getStatus());
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segment.setVectorId(AiKnowledgeSegmentDO.VECTOR_ID_EMPTY);
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segment.setRetrievalCount(0);
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return segment;
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}
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private Integer estimateTokens(String text) {
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if (StrUtil.isEmpty(text)) return 0;
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int chineseChars = 0, englishWords = 0;
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for (char c : text.toCharArray()) {
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if (c >= 0x4E00 && c <= 0x9FA5) chineseChars++;
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}
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for (String word : text.split("\\s+")) {
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if (word.matches(".*[a-zA-Z].*")) englishWords++;
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}
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return chineseChars + (int) (englishWords * 1.3);
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}
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}
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