Add configurable allowed file types

internal/config/config_test.go

@@ -0,0 +1,68 @@
+package config
+
+import "testing"
+
+func TestDefaultsAllowedFiles(t *testing.T) {
+	cfg := defaults()
+
+	if cfg.AllowedFilesMode != AllowedFilesByMediaType {
+		t.Fatalf("allowed files mode = %q, want %q", cfg.AllowedFilesMode, AllowedFilesByMediaType)
+	}
+
+	wantTypes := []string{MediaTypeAudio, MediaTypeVideo}
+	if len(cfg.EnabledMediaTypes) != len(wantTypes) {
+		t.Fatalf("enabled media types len = %d, want %d", len(cfg.EnabledMediaTypes), len(wantTypes))
+	}
+	for i, want := range wantTypes {
+		if cfg.EnabledMediaTypes[i] != want {
+			t.Fatalf("enabled media types[%d] = %q, want %q", i, cfg.EnabledMediaTypes[i], want)
+		}
+	}
+
+	exts := cfg.EffectiveAllowedExtensions()
+	if containsString(exts, ".jpg") {
+		t.Fatalf("default extensions unexpectedly include photo files: %v", exts)
+	}
+	if !containsString(exts, ".mp3") || !containsString(exts, ".mp4") {
+		t.Fatalf("default extensions = %v, want audio/video entries", exts)
+	}
+}
+
+func TestValidateAllowedFilesModeExtensions(t *testing.T) {
+	cfg := defaults()
+	cfg.AllowedFilesMode = AllowedFilesByExtensions
+	cfg.AllowedExtensions = []string{" mp3 ", ".MP4", "*.jpg", ".mp3"}
+
+	if err := cfg.Validate(); err != nil {
+		t.Fatalf("Validate() error = %v", err)
+	}
+
+	want := []string{".mp3", ".mp4", ".jpg"}
+	if len(cfg.AllowedExtensions) != len(want) {
+		t.Fatalf("allowed extensions len = %d, want %d", len(cfg.AllowedExtensions), len(want))
+	}
+	for i, item := range want {
+		if cfg.AllowedExtensions[i] != item {
+			t.Fatalf("allowed extensions[%d] = %q, want %q", i, cfg.AllowedExtensions[i], item)
+		}
+	}
+}
+
+func TestValidateRejectsEmptyAllowedFiles(t *testing.T) {
+	cfg := defaults()
+	cfg.AllowedFilesMode = AllowedFilesByExtensions
+	cfg.AllowedExtensions = nil
+
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("Validate() error = nil, want non-nil")
+	}
+}
+
+func containsString(items []string, want string) bool {
+	for _, item := range items {
+		if item == want {
+			return true
+		}
+	}
+	return false
+}