fix(log): redact marked secrets in every field type

redactSecrets only looked at strings, maps and errors, so a marked secret
inside a slice, struct or []byte field was logged as is, and a typed-nil
error field made it panic. It now renders each field with fmt.Sprint, as
the text formatter does (which also survives typed-nil errors), and writes
[]byte raw.

Signed-off-by: Deluan <deluan@navidrome.org>

log/redactrus.go

@@ -83,18 +83,12 @@ func redactSecrets(e *logrus.Entry) {
 		if v == nil {
 			continue
 		}
+		// fmt.Sprint renders like the text formatter and survives typed-nil errors; []byte is written raw.
 		var s string
-		if err, ok := v.(error); ok {
-			s = err.Error()
+		if b, ok := v.([]byte); ok {
+			s = string(b)
 		} else {
-			switch reflect.TypeOf(v).Kind() {
-			case reflect.String:
-				s = reflect.ValueOf(v).String()
-			case reflect.Map:
-				s = fmt.Sprintf("%+v", v)
-			default:
-				continue
-			}
+			s = fmt.Sprint(v)
 		}
 		if hidden := hide(s); hidden != s {
 			e.Data[k] = hidden

log/redactrus_test.go

@@ -2,6 +2,7 @@ package log
 
 import (
 	"errors"
+	"net/url"
 	"testing"
 
 	"github.com/sirupsen/logrus"
@@ -196,6 +197,26 @@ func TestFireRedactsContextSecrets(t *testing.T) {
 	assert.Equal(t, namedString("untouched"), e.Data["clean"])
 }
 
+func TestFireRedactsContextSecretsInAnyValueType(t *testing.T) {
+	ctx := WithSecrets(t.Context(), "s3cr3t-value")
+	var nilErr *url.Error
+	e := &logrus.Entry{
+		Context: ctx,
+		Data: logrus.Fields{
+			"slice":  []any{"s3cr3t-value", 1},
+			"struct": struct{ A string }{"s3cr3t-value"},
+			"bytes":  []byte("has s3cr3t-value"),
+			"nilErr": nilErr,
+		},
+	}
+
+	assert.NotPanics(t, func() { _ = (&Hook{}).Fire(e) })
+	assert.Equal(t, "[[REDACTED] 1]", e.Data["slice"])
+	assert.Equal(t, "{[REDACTED]}", e.Data["struct"])
+	assert.Equal(t, "has [REDACTED]", e.Data["bytes"])
+	assert.Equal(t, nilErr, e.Data["nilErr"])
+}
+
 func TestFireWithoutContextSecretsLeavesEntryUnchanged(t *testing.T) {
 	args := map[string]any{"p0": "value"}
 	e := &logrus.Entry{Context: t.Context(), Message: "value", Data: logrus.Fields{"str": "value", "args": args}}