Fix Allow multiple audiences

jwt/validation.go

@@ -87,11 +87,16 @@ func (c Claims) ValidateWithLeeway(e Expected, leeway time.Duration) error {
 	}
 
 	if len(e.Audience) != 0 {
+		flag := false
 		for _, v := range e.Audience {
-			if !c.Audience.Contains(v) {
-				return ErrInvalidAudience
+			if c.Audience.Contains(v) {
+				flag = true
+				break
 			}
 		}
+		if !flag {
+			return ErrInvalidAudience
+		}
 	}
 
 	if !e.Time.IsZero() {

jwt/validation_test.go

@@ -44,6 +44,17 @@ func TestFieldsMatch(t *testing.T) {
 		assert.NoError(t, c.Validate(v))
 	}
 
+	claimsWithSingleAudience := Claims{
+		Issuer:   "issuer",
+		Subject:  "subject",
+		Audience: []string{"a1"},
+		ID:       "42",
+	}
+
+	for _, v := range valid {
+		assert.NoError(t, claimsWithSingleAudience.Validate(v))
+	}
+
 	invalid := []struct {
 		Expected Expected
 		Error    error