Handle permission (and other) errors during os.Stat(imposters_path)

internal/server/http/imposter.go

@@ -133,9 +133,16 @@ type ImposterFs struct {
 }
 
 func NewImposterFS(path string) (ImposterFs, error) {
-	// TODO: What if user lacks permissions?
-	if _, err := os.Stat(path); os.IsNotExist(err) {
-		return ImposterFs{}, fmt.Errorf("%w: the directory %s doesn't exists", err, path)
+	_, err := os.Stat(path)
+	if err != nil {
+		switch {
+		case os.IsNotExist(err):
+			return ImposterFs{}, fmt.Errorf("the directory '%s' does not exist", path)
+		case os.IsPermission(err):
+			return ImposterFs{}, fmt.Errorf("could not read the directory '%s': permission denied", path)
+		default:
+			return ImposterFs{}, fmt.Errorf("could not read the directory '%s': %w", path, err)
+		}
 	}
 
 	return ImposterFs{

internal/server/http/imposter_test.go

@@ -13,7 +13,7 @@ func TestNewImposterFS(t *testing.T) {
 	t.Run("imposters directory not found", func(t *testing.T) {
 		_, err := NewImposterFS("failImposterPath")
 		assert.Error(t, err)
-		assert.Contains(t, err.Error(), "the directory failImposterPath doesn't exists")
+		assert.Contains(t, err.Error(), "the directory 'failImposterPath' does not exist")
 	})
 
 	t.Run("existing imposters directory", func(t *testing.T) {

internal/server/http/server.go

@@ -4,11 +4,12 @@ import (
 	"context"
 	"crypto/tls"
 	_ "embed"
+	"log"
+	"net/http"
+
 	killgrave "github.com/friendsofgo/killgrave/internal"
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
-	"log"
-	"net/http"
 )
 
 //go:embed cert/server.key