Support setting sticky cookie max age

pkg/config/dynamic/http_config.go

@@ -155,6 +155,10 @@ type Cookie struct {
 	// SameSite defines the same site policy.
 	// More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
 	SameSite string `json:"sameSite,omitempty" toml:"sameSite,omitempty" yaml:"sameSite,omitempty" export:"true"`
+	// MaxAge indicates the number of seconds until the cookie expires.
+	// When set to a negative number, the cookie expires immediately.
+	// When set to zero, the cookie never expires.
+	MaxAge int `json:"maxAge,omitempty" toml:"maxAge,omitempty" yaml:"maxAge,omitempty" export:"true"`
 }
 
 // +k8s:deepcopy-gen=true

pkg/config/label/label_test.go

@@ -1334,6 +1334,7 @@ func TestEncodeConfiguration(t *testing.T) {
 		"traefik.HTTP.Services.Service0.LoadBalancer.Sticky.Cookie.Name":               "foobar",
 		"traefik.HTTP.Services.Service0.LoadBalancer.Sticky.Cookie.HTTPOnly":           "true",
 		"traefik.HTTP.Services.Service0.LoadBalancer.Sticky.Cookie.Secure":             "false",
+		"traefik.HTTP.Services.Service0.LoadBalancer.Sticky.Cookie.MaxAge":             "0",
 		"traefik.HTTP.Services.Service0.LoadBalancer.ServersTransport":                 "foobar",
 		"traefik.HTTP.Services.Service1.LoadBalancer.HealthCheck.Headers.name0":        "foobar",
 		"traefik.HTTP.Services.Service1.LoadBalancer.HealthCheck.Headers.name1":        "foobar",

pkg/server/service/loadbalancer/wrr/wrr.go

@@ -25,6 +25,7 @@ type stickyCookie struct {
 	secure   bool
 	httpOnly bool
 	sameSite string
+	maxAge   int
 }
 
 func convertSameSite(sameSite string) http.SameSite {
@@ -77,6 +78,7 @@ func New(sticky *dynamic.Sticky, wantHealthCheck bool) *Balancer {
 			secure:   sticky.Cookie.Secure,
 			httpOnly: sticky.Cookie.HTTPOnly,
 			sameSite: sticky.Cookie.SameSite,
+			maxAge:   sticky.Cookie.MaxAge,
 		}
 	}
 
@@ -238,6 +240,7 @@ func (b *Balancer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 			HttpOnly: b.stickyCookie.httpOnly,
 			Secure:   b.stickyCookie.secure,
 			SameSite: convertSameSite(b.stickyCookie.sameSite),
+			MaxAge:   b.stickyCookie.maxAge,
 		}
 		http.SetCookie(w, cookie)
 	}

pkg/server/service/loadbalancer/wrr/wrr_test.go

@@ -225,6 +225,7 @@ func TestSticky(t *testing.T) {
 			Secure:   true,
 			HTTPOnly: true,
 			SameSite: "none",
+			MaxAge:   42,
 		},
 	}, false)
 
@@ -261,6 +262,7 @@ func TestSticky(t *testing.T) {
 	assert.True(t, recorder.cookies["test"].HttpOnly)
 	assert.True(t, recorder.cookies["test"].Secure)
 	assert.Equal(t, http.SameSiteNoneMode, recorder.cookies["test"].SameSite)
+	assert.Equal(t, 42, recorder.cookies["test"].MaxAge)
 }
 
 func TestSticky_FallBack(t *testing.T) {