refactor: consolidate download domain into download package

internal/download/stream.go

@@ -0,0 +1,64 @@
+package download
+
+import (
+	"context"
+	"errors"
+	"io"
+	"os"
+
+	"github.com/mathismqn/godeez/internal/deezer"
+)
+
+const chunkSize = 2048
+
+func (d *Downloader) streamToFile(ctx context.Context, stream io.ReadCloser, outputPath string, key []byte) error {
+	defer stream.Close()
+
+	file, err := os.Create(outputPath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	buffer := make([]byte, chunkSize)
+	for chunk := 0; ; chunk++ {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+
+		totalRead := 0
+		for totalRead < chunkSize {
+			n, err := stream.Read(buffer[totalRead:])
+			totalRead += n
+			if err != nil {
+				if errors.Is(err, io.EOF) {
+					break
+				}
+				return err
+			}
+		}
+
+		if totalRead == 0 {
+			break
+		}
+
+		if chunk%3 == 0 && totalRead == chunkSize {
+			buffer, err = deezer.DecryptBlowfish(buffer, key)
+			if err != nil {
+				return err
+			}
+		}
+
+		if _, err = file.Write(buffer[:totalRead]); err != nil {
+			return err
+		}
+
+		if totalRead < chunkSize {
+			break
+		}
+	}
+
+	return nil
+}