Plan independent BFF and adapt selected Sendico foundations (#34)

backend/internal/browser/policy_test.go

@@ -0,0 +1,79 @@
+package browser
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+)
+
+func TestMutationRequiresOriginAndHeader(t *testing.T) {
+	p, err := New([]string{"https://app.example.com"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, tc := range []struct {
+		origin, header, transport string
+		valid                     bool
+	}{
+		{"https://app.example.com", "1", "", true},
+		{"https://APP.example.com", "1", "", true},
+		{"https://evil.example.com", "1", "", false},
+		{"https://app.example.com.evil.test", "1", "", false},
+		{"https://app.example.com/path", "1", "", false},
+		{"https://app.example.com?query", "1", "", false},
+		{"https://app.example.com#fragment", "1", "", false},
+		{"https://app.example.com", "", "bearer", false},
+		{"", "1", "bearer", false},
+		{"null", "1", "cookie", false},
+	} {
+		r := httptest.NewRequest(http.MethodPost, "https://app.example.com/api/session", nil)
+		r.Header.Set("Origin", tc.origin)
+		r.Header.Set(CSRFHeader, tc.header)
+		r.Header.Set("X-Auth-Transport", tc.transport)
+		if got := p.Validate(r); (got == nil) != tc.valid {
+			t.Errorf("%+v: %v", tc, got)
+		}
+	}
+	if p.Validate(httptest.NewRequest(http.MethodGet, "https://app.example.com/api/session", nil)) != nil {
+		t.Fatal("read rejected")
+	}
+	for _, origin := range []string{"*", "http://app.example.com", "https://user@app.example.com", "https://app.example.com/"} {
+		if _, err := New([]string{origin}); err == nil {
+			t.Errorf("accepted configuration %q", origin)
+		}
+	}
+	if _, err := New(nil); err == nil {
+		t.Fatal("empty origin policy accepted")
+	}
+}
+
+func TestSessionCookie(t *testing.T) {
+	now := time.Date(2026, 9, 12, 0, 0, 0, 0, time.UTC)
+	w := httptest.NewRecorder()
+	if err := SetSession(w, "opaque-token", now, now.Add(time.Hour)); err != nil {
+		t.Fatal(err)
+	}
+	c := w.Result().Cookies()[0]
+	if c.Name != SessionCookie || !c.Secure || !c.HttpOnly || c.Path != "/" || c.Domain != "" || c.SameSite != http.SameSiteLaxMode || c.MaxAge != 3600 {
+		t.Fatalf("bad cookie: %+v", c)
+	}
+	r := httptest.NewRequest(http.MethodGet, "https://app.example.com/api/session", nil)
+	r.AddCookie(c)
+	if value, err := Credential(r); err != nil || value != "opaque-token" {
+		t.Fatal("cookie not read")
+	}
+	r.AddCookie(c)
+	if _, err := Credential(r); err == nil {
+		t.Fatal("ambiguous credential accepted")
+	}
+	if err := SetSession(httptest.NewRecorder(), "token", now, now); err == nil {
+		t.Fatal("expired cookie accepted")
+	}
+	w = httptest.NewRecorder()
+	ClearSession(w)
+	c = w.Result().Cookies()[0]
+	if c.MaxAge != -1 || c.Value != "" || c.Path != "/" || !c.Secure {
+		t.Fatal("cookie not cleared safely")
+	}
+}