328 lines
9.5 KiB
Go
328 lines
9.5 KiB
Go
package chat
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"mime/multipart"
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"net/http"
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"net/textproto"
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"regexp"
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"sort"
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"strings"
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"time"
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"unicode/utf8"
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)
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const (
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maxQrCodeOCRFileSize = 10 * 1024 * 1024
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qrCodeOCRPollInterval = 2 * time.Second
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qrCodeOCRMaxPollTimes = 45
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)
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var (
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ErrQrCodeOCRNotConfigured = errors.New("二维码 OCR Token 未配置")
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ErrQrCodeOCRInvalidFile = errors.New("无效的二维码图片")
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ErrQrCodeOCRUnavailable = errors.New("二维码 OCR 服务不可用")
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)
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type QrCodeOCRResult struct {
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GroupName string `json:"group_name"`
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Candidates []string `json:"candidates"`
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RawText string `json:"raw_text"`
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}
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type paddleOCRJobResponse struct {
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Data struct {
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JobID string `json:"jobId"`
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} `json:"data"`
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Message string `json:"message"`
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Error string `json:"error"`
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}
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type paddleOCRJobStatusResponse struct {
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Data struct {
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State string `json:"state"`
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ErrorMsg string `json:"errorMsg"`
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ResultURL struct {
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JSONURL string `json:"jsonUrl"`
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} `json:"resultUrl"`
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} `json:"data"`
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Message string `json:"message"`
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Error string `json:"error"`
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}
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// RecognizeQrCodeGroupName 调用 PaddleOCR 异步 API 识别二维码图片中的群名。
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func (r *Repository) RecognizeQrCodeGroupName(ctx context.Context, filename, contentType string, reader io.Reader) (*QrCodeOCRResult, error) {
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config, err := r.GetQrCodeOCRConfig(ctx)
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if err != nil {
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return nil, err
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}
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if strings.TrimSpace(config.Token) == "" {
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return nil, ErrQrCodeOCRNotConfigured
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}
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data, err := io.ReadAll(io.LimitReader(reader, maxQrCodeOCRFileSize+1))
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if err != nil || len(data) == 0 || len(data) > maxQrCodeOCRFileSize {
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return nil, ErrQrCodeOCRInvalidFile
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}
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if contentType == "" {
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contentType = http.DetectContentType(data)
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}
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if !strings.HasPrefix(contentType, "image/") {
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return nil, ErrQrCodeOCRInvalidFile
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}
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jobID, err := submitPaddleOCRJob(ctx, config, filename, contentType, data)
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if err != nil {
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return nil, err
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}
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jsonURL, err := waitPaddleOCRJob(ctx, config, jobID)
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if err != nil {
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return nil, err
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}
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rawText, err := fetchPaddleOCRText(ctx, jsonURL)
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if err != nil {
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return nil, err
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}
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candidates := parseQrCodeGroupNameCandidates(rawText)
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groupName := ""
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if len(candidates) > 0 {
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groupName = candidates[0]
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}
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return &QrCodeOCRResult{
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GroupName: groupName,
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Candidates: candidates,
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RawText: rawText,
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}, nil
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}
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func submitPaddleOCRJob(ctx context.Context, config *QrCodeOCRConfig, filename, contentType string, data []byte) (string, error) {
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body := &bytes.Buffer{}
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writer := multipart.NewWriter(body)
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_ = writer.WriteField("model", config.Model)
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optionalPayload, _ := json.Marshal(map[string]bool{
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"useDocOrientationClassify": false,
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"useDocUnwarping": false,
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"useChartRecognition": false,
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})
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_ = writer.WriteField("optionalPayload", string(optionalPayload))
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partHeader := make(textproto.MIMEHeader)
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partHeader.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, escapeQuotes(filename)))
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partHeader.Set("Content-Type", contentType)
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fileWriter, err := writer.CreatePart(partHeader)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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if _, err := fileWriter.Write(data); err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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if err := writer.Close(); err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, config.JobURL, body)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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req.Header.Set("Authorization", "bearer "+config.Token)
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req.Header.Set("Content-Type", writer.FormDataContentType())
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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defer resp.Body.Close()
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respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2*1024*1024))
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("%w: status=%d body=%s", ErrQrCodeOCRUnavailable, resp.StatusCode, string(respBody))
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}
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var payload paddleOCRJobResponse
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if err := json.Unmarshal(respBody, &payload); err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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if payload.Data.JobID == "" {
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return "", fmt.Errorf("%w: 未返回 jobId", ErrQrCodeOCRUnavailable)
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}
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return payload.Data.JobID, nil
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}
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func waitPaddleOCRJob(ctx context.Context, config *QrCodeOCRConfig, jobID string) (string, error) {
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for i := 0; i < qrCodeOCRMaxPollTimes; i++ {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, strings.TrimRight(config.JobURL, "/")+"/"+jobID, nil)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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req.Header.Set("Authorization", "bearer "+config.Token)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2*1024*1024))
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_ = resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("%w: status=%d body=%s", ErrQrCodeOCRUnavailable, resp.StatusCode, string(respBody))
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}
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var payload paddleOCRJobStatusResponse
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if err := json.Unmarshal(respBody, &payload); err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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switch payload.Data.State {
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case "done":
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if payload.Data.ResultURL.JSONURL == "" {
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return "", fmt.Errorf("%w: 未返回识别结果地址", ErrQrCodeOCRUnavailable)
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}
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return payload.Data.ResultURL.JSONURL, nil
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case "failed":
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if payload.Data.ErrorMsg != "" {
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return "", fmt.Errorf("%w: %s", ErrQrCodeOCRUnavailable, payload.Data.ErrorMsg)
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}
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return "", ErrQrCodeOCRUnavailable
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}
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select {
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case <-ctx.Done():
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return "", ctx.Err()
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case <-time.After(qrCodeOCRPollInterval):
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}
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}
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return "", fmt.Errorf("%w: 识别超时", ErrQrCodeOCRUnavailable)
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}
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func fetchPaddleOCRText(ctx context.Context, jsonURL string) (string, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, jsonURL, nil)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2*1024*1024))
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return "", fmt.Errorf("%w: status=%d body=%s", ErrQrCodeOCRUnavailable, resp.StatusCode, string(respBody))
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}
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body, err := io.ReadAll(io.LimitReader(resp.Body, 10*1024*1024))
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if err != nil {
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return "", fmt.Errorf("%w: %v", ErrQrCodeOCRUnavailable, err)
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}
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return collectPaddleOCRJSONLText(string(body)), nil
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}
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func collectPaddleOCRJSONLText(raw string) string {
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var texts []string
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for _, line := range strings.Split(raw, "\n") {
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line = strings.TrimSpace(line)
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if line == "" {
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continue
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}
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var value any
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if err := json.Unmarshal([]byte(line), &value); err != nil {
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texts = append(texts, line)
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continue
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}
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collectPaddleOCRText(value, &texts)
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}
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return strings.Join(texts, "\n")
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}
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func collectPaddleOCRText(value any, texts *[]string) {
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switch v := value.(type) {
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case string:
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if strings.TrimSpace(v) != "" {
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*texts = append(*texts, v)
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}
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case []any:
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for _, item := range v {
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collectPaddleOCRText(item, texts)
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}
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case map[string]any:
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if markdown, ok := v["markdown"].(map[string]any); ok {
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if text, ok := markdown["text"].(string); ok && strings.TrimSpace(text) != "" {
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*texts = append(*texts, text)
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}
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}
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for key, item := range v {
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if key == "images" || key == "outputImages" {
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continue
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}
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collectPaddleOCRText(item, texts)
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}
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}
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}
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func parseQrCodeGroupNameCandidates(rawText string) []string {
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excluded := []*regexp.Regexp{
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regexp.MustCompile(`使用.*微信`),
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regexp.MustCompile(`企业微信`),
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regexp.MustCompile(`扫码`),
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regexp.MustCompile(`加入`),
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regexp.MustCompile(`二维码`),
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regexp.MustCompile(`有效`),
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regexp.MustCompile(`天内`),
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regexp.MustCompile(`月\d+日`),
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regexp.MustCompile(`前`),
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regexp.MustCompile(`^\d+$`),
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}
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scores := map[string]int{}
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for _, line := range strings.Split(rawText, "\n") {
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line = normalizeQrCodeOCRLine(line)
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if line == "" || utf8.RuneCountInString(line) < 3 || utf8.RuneCountInString(line) > 64 {
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continue
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}
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if !regexp.MustCompile(`[\p{Han}]`).MatchString(line) {
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continue
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}
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skip := false
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for _, pattern := range excluded {
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if pattern.MatchString(line) {
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skip = true
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break
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}
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}
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if skip {
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continue
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}
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scores[line] = scoreQrCodeGroupNameCandidate(line)
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}
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candidates := make([]string, 0, len(scores))
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for candidate := range scores {
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candidates = append(candidates, candidate)
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}
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sort.SliceStable(candidates, func(i, j int) bool {
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return scores[candidates[i]] > scores[candidates[j]]
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})
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return candidates
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}
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func normalizeQrCodeOCRLine(line string) string {
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replacer := strings.NewReplacer(" ", "", "\t", "", "|", "", "｜", "", "#", "", "*", "", "`", "", ">", "")
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line = replacer.Replace(line)
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allowed := regexp.MustCompile(`[^\p{Han}a-zA-Z0-9_（）()《》\-—·]+`)
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return allowed.ReplaceAllString(line, "")
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}
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func scoreQrCodeGroupNameCandidate(line string) int {
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length := utf8.RuneCountInString(line)
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score := length
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if score > 20 {
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score = 20
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}
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if strings.Contains(line, "群") {
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score += 100
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}
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if strings.Contains(line, "-") || strings.Contains(line, "—") {
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score += 30
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}
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if length >= 6 && length <= 24 {
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score += 20
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}
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return score
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}
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func escapeQuotes(value string) string {
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return strings.NewReplacer("\\", "\\\\", `"`, "\\\"").Replace(value)
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}
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