initial commit

backend/internal/service/cv.go

@@ -0,0 +1,78 @@
+package service
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"path/filepath"
+	"strings"
+
+	"github.com/ledongthuc/pdf"
+)
+
+func extractCVText(filename string, content []byte) (text string, err error) {
+	if len(content) == 0 {
+		return "", nil
+	}
+	switch strings.ToLower(filepath.Ext(filename)) {
+	case ".pdf":
+		defer func() {
+			if recovered := recover(); recovered != nil {
+				text = ""
+				err = fmt.Errorf("unreadable PDF")
+			}
+		}()
+		reader, err := pdf.NewReader(bytes.NewReader(content), int64(len(content)))
+		if err != nil {
+			return "", fmt.Errorf("read PDF: %w", err)
+		}
+		plainText, err := reader.GetPlainText()
+		if err != nil {
+			return "", fmt.Errorf("extract PDF text: %w", err)
+		}
+		value, err := io.ReadAll(plainText)
+		if err != nil {
+			return "", fmt.Errorf("read PDF text: %w", err)
+		}
+		return string(value), nil
+	case ".docx":
+		return extractDOCX(content)
+	default:
+		return string(content), nil
+	}
+}
+
+func extractDOCX(content []byte) (string, error) {
+	archive, err := zip.NewReader(bytes.NewReader(content), int64(len(content)))
+	if err != nil {
+		return "", fmt.Errorf("open DOCX: %w", err)
+	}
+	for _, file := range archive.File {
+		if file.Name != "word/document.xml" {
+			continue
+		}
+		stream, err := file.Open()
+		if err != nil {
+			return "", fmt.Errorf("open DOCX document: %w", err)
+		}
+		defer stream.Close()
+		decoder := xml.NewDecoder(stream)
+		var text strings.Builder
+		for {
+			token, err := decoder.Token()
+			if err == io.EOF {
+				return text.String(), nil
+			}
+			if err != nil {
+				return "", fmt.Errorf("parse DOCX document: %w", err)
+			}
+			if chars, ok := token.(xml.CharData); ok {
+				text.Write(chars)
+				text.WriteByte(' ')
+			}
+		}
+	}
+	return "", fmt.Errorf("DOCX document body is missing")
+}