Merged in feature/doc_import (pull request #177)

integration of background processor

* integration part 1

* feature working

* fix mimetype issue

internal/document/batch/storage/service.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"mime"
 	"path/filepath"
 	"time"
 
@@ -28,6 +29,17 @@ func New(cfg objectstore.ConfigProvider) *Service {
 	return &Service{cfg: cfg}
 }
 
+// detectContentType determines the MIME type based on file extension
+func detectContentType(filename string) string {
+	// Use Go's standard library to detect MIME type from extension
+	contentType := mime.TypeByExtension(filepath.Ext(filename))
+	if contentType == "" {
+		// Default to binary if extension is unknown
+		return "application/octet-stream"
+	}
+	return contentType
+}
+
 // StoreZIPFile uploads ZIP file to S3 and returns storage metadata
 func (s *Service) StoreZIPFile(ctx context.Context, clientID string, filename string, content io.Reader) (*StorageResult, error) {
 	// Create unique S3 key with timestamp and UUID
@@ -45,11 +57,15 @@ func (s *Service) StoreZIPFile(ctx context.Context, clientID string, filename st
 		return nil, fmt.Errorf("failed to read file content: %w", err)
 	}
 
+	// Detect content type from filename
+	contentType := detectContentType(filename)
+
 	// Upload to S3 using the store client
 	_, err = s.cfg.GetStoreClient().PutObject(ctx, &s3.PutObjectInput{
-		Bucket: &bucketName,
-		Key:    &key,
-		Body:   bytes.NewReader(buf.Bytes()),
+		Bucket:      &bucketName,
+		Key:         &key,
+		Body:        bytes.NewReader(buf.Bytes()),
+		ContentType: &contentType,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to upload ZIP to S3: %w", err)