first commit

utils/encoder.go

@@ -0,0 +1,31 @@
+package utils
+
+import (
+	"encoding/base64"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+// mp3ToBase64 reads an MP3 file and returns its base64-encoded content
+func Mp3ToBase64(filePath string) (string, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return "", fmt.Errorf("failed to open MP3 file: %v", err)
+	}
+	defer file.Close()
+
+	// Verify file is an MP3
+	if !strings.HasSuffix(strings.ToLower(filePath), ".mp3") {
+		return "", fmt.Errorf("file is not an MP3: %s", filePath)
+	}
+
+	data, err := io.ReadAll(file)
+	if err != nil {
+		return "", fmt.Errorf("failed to read MP3 file: %v", err)
+	}
+
+	encoded := base64.StdEncoding.EncodeToString(data)
+	return encoded, nil
+}

utils/encoder_test.go

@@ -0,0 +1,66 @@
+package utils_test
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"git.savin.nyc/alex/go-iar-notificator/utils"
+)
+
+func TestMp3ToBase64_Success(t *testing.T) {
+	// Create a temporary MP3 file
+	tempDir := t.TempDir()
+	mp3File := filepath.Join(tempDir, "test.mp3")
+	testData := "fake mp3 data"
+	err := os.WriteFile(mp3File, []byte(testData), 0644)
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+
+	// Test the function
+	result, err := utils.Mp3ToBase64(mp3File)
+	if err != nil {
+		t.Fatalf("Expected no error, got %v", err)
+	}
+
+	// Verify the result is base64 encoded
+	expected := "ZmFrZSBtcDMgZGF0YQ==" // base64 of "fake mp3 data"
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}
+
+func TestMp3ToBase64_FileNotFound(t *testing.T) {
+	_, err := utils.Mp3ToBase64("/nonexistent/file.mp3")
+	if err == nil {
+		t.Error("Expected error for non-existent file, got nil")
+	}
+	if !strings.Contains(err.Error(), "failed to open MP3 file") {
+		t.Errorf("Expected error message to contain 'failed to open MP3 file', got %v", err)
+	}
+}
+
+func TestMp3ToBase64_NotMP3(t *testing.T) {
+	// Create a temporary non-MP3 file
+	tempDir := t.TempDir()
+	txtFile := filepath.Join(tempDir, "test.txt")
+	err := os.WriteFile(txtFile, []byte("text data"), 0644)
+	if err != nil {
+		t.Fatalf("Failed to create temp file: %v", err)
+	}
+
+	_, err = utils.Mp3ToBase64(txtFile)
+	if err == nil {
+		t.Error("Expected error for non-MP3 file, got nil")
+	}
+	if !strings.Contains(err.Error(), "file is not an MP3") {
+		t.Errorf("Expected error message to contain 'file is not an MP3', got %v", err)
+	}
+}
+
+func TestMp3ToBase64_ReadError(t *testing.T) {
+	// This is harder to test without mocking, but we can assume the file creation/read works as above
+	// For now, the success test covers the happy path
+}