feat: add handling for 'commonsv2.Error' as default error

pkg/httperr/default_error.go

@@ -0,0 +1,36 @@
+package httperr
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/mittwald/api-client-go/mittwaldv2/generated/schemas/commonsv2"
+)
+
+func IsDefaultErrorResponse(res *http.Response) (*commonsv2.Error, bool) {
+	target := commonsv2.Error{}
+
+	if err := json.NewDecoder(res.Body).Decode(&target); err != nil {
+		return nil, false
+	}
+
+	if target.Type == "" || target.Message == "" {
+		return nil, false
+	}
+
+	return &target, true
+}
+
+// ErrDefault represents the default fallback error used in the mittwald api.
+type ErrDefault struct {
+	Response     *http.Response
+	DefaultError *commonsv2.Error
+}
+
+func (e *ErrDefault) Error() string {
+	if e.DefaultError != nil {
+		return fmt.Sprintf("%s: %s", e.DefaultError.Type, e.DefaultError.Message)
+	}
+	return "unexpected default error: <nil>"
+}

pkg/httperr/from_response.go

@@ -18,6 +18,10 @@ func ErrFromResponse(res *http.Response) error {
 		}
 		return &ErrBadRequest{Response: res}
 	default:
+		if defaultError, isDefaultError := IsDefaultErrorResponse(res); isDefaultError {
+			return &ErrDefault{Response: res, DefaultError: defaultError}
+		}
+
 		return &ErrUnexpectedResponse{Response: res}
 	}
 }