Answer domain redirects from the edge, with or without Traefik

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

redirect_test.go

@@ -0,0 +1,44 @@
+package blacktip
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"git.veillax.com/Veillax/reef/model"
+)
+
+// A redirect mapping answers from the edge itself: no proxy, relay or target is needed.
+func TestRedirectMappingAnswersWithoutATarget(t *testing.T) {
+	b := &Blacktip{logq: make(chan model.LogEntry, 8)}
+	mk := func(m model.Mapping) *listener {
+		return &listener{b: b, kind: model.ProtoHTTP, maps: []*mapState{{b: b, m: m}}}
+	}
+	cases := []struct {
+		name string
+		m    model.Mapping
+		uri  string
+		code int
+		loc  string
+	}{
+		{"temporary, no path", model.Mapping{Hostname: "old.test", RedirectTo: "https://new.test/home"}, "/a?b=1", http.StatusFound, "https://new.test/home"},
+		{"permanent keeps path and query", model.Mapping{Hostname: "old.test", RedirectTo: "https://new.test", RedirectPermanent: true, RedirectKeepPath: true}, "/a/b?c=d", http.StatusMovedPermanently, "https://new.test/a/b?c=d"},
+	}
+	for _, c := range cases {
+		r := httptest.NewRequest("GET", "http://old.test"+c.uri, nil)
+		w := httptest.NewRecorder()
+		mk(c.m).ServeHTTP(w, r)
+		if w.Code != c.code || w.Header().Get("Location") != c.loc {
+			t.Errorf("%s: got %d %q, want %d %q", c.name, w.Code, w.Header().Get("Location"), c.code, c.loc)
+		}
+	}
+	// a hostname nobody serves is still a 404
+	w := httptest.NewRecorder()
+	mk(cases[0].m).ServeHTTP(w, httptest.NewRequest("GET", "http://other.test/", nil))
+	if w.Code != http.StatusNotFound {
+		t.Errorf("unknown host: got %d", w.Code)
+	}
+	if e := <-b.logq; e.Result != "redirect" || e.Status != http.StatusFound {
+		t.Errorf("access log entry: %+v", e)
+	}
+}