feat(server): add project sharing access control

server/internal/errorx/error_test.go

@@ -0,0 +1,36 @@
+package errorx
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	sharingmodule "img_infinite_canvas/internal/modules/sharing"
+)
+
+func TestHandleShareInviteConflicts(t *testing.T) {
+	tests := []struct {
+		name      string
+		err       error
+		errorCode string
+	}{
+		{name: "self invite", err: sharingmodule.ErrSelfInvite, errorCode: "share.self_invite"},
+		{name: "member exists", err: sharingmodule.ErrMemberExists, errorCode: "share.member_exists"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			status, body := Handle(context.Background(), tt.err)
+			if status != http.StatusConflict {
+				t.Fatalf("expected status %d, got %d", http.StatusConflict, status)
+			}
+			payload, ok := body.(map[string]any)
+			if !ok {
+				t.Fatalf("expected map response, got %T", body)
+			}
+			if payload["errorCode"] != tt.errorCode {
+				t.Fatalf("expected error code %q, got %v", tt.errorCode, payload["errorCode"])
+			}
+		})
+	}
+}