Merge pull request #5031 from keaipiao/fix/easypay-error-utf8

fix(payment): preserve UTF-8 in EasyPay errors

backend/internal/payment/provider/easypay.go

@@ -15,6 +15,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/Wei-Shaw/sub2api/internal/payment"
 )
@@ -477,7 +478,11 @@ func summarizeEasyPayResponse(body []byte) string {
 		return "<empty>"
 	}
 	if len(summary) > maxEasypayErrorSummary {
-		return summary[:maxEasypayErrorSummary] + "..."
+		truncated := summary[:maxEasypayErrorSummary]
+		for len(truncated) > 0 && !utf8.ValidString(truncated) {
+			truncated = truncated[:len(truncated)-1]
+		}
+		return truncated + "..."
 	}
 	return summary
 }

backend/internal/payment/provider/easypay_refund_test.go

@@ -7,6 +7,7 @@ import (
 	"net/url"
 	"strings"
 	"testing"
+	"unicode/utf8"
 
 	"github.com/Wei-Shaw/sub2api/internal/payment"
 )
@@ -179,6 +180,18 @@ func TestEasyPayRefundResponseErrors(t *testing.T) {
 	}
 }
 
+func TestSummarizeEasyPayResponsePreservesUTF8(t *testing.T) {
+	t.Parallel()
+
+	summary := summarizeEasyPayResponse([]byte(strings.Repeat("错", 171)))
+	if !utf8.ValidString(summary) {
+		t.Fatalf("summarizeEasyPayResponse returned invalid UTF-8: %q", summary)
+	}
+	if !strings.HasSuffix(summary, "...") {
+		t.Fatalf("summarizeEasyPayResponse() = %q, want truncated suffix", summary)
+	}
+}
+
 func TestEasyPayCustomMethodsUseConfiguredUpstreamType(t *testing.T) {
 	t.Parallel()