Reintroduce dropped v2 dynamic config

Co-authored-by: Baptiste Mayelle <baptiste.mayelle@traefik.io>

pkg/tls/tls.go

@@ -25,6 +25,9 @@ type Options struct {
 	ClientAuth       ClientAuth `json:"clientAuth,omitempty" toml:"clientAuth,omitempty" yaml:"clientAuth,omitempty"`
 	SniStrict        bool       `json:"sniStrict,omitempty" toml:"sniStrict,omitempty" yaml:"sniStrict,omitempty" export:"true"`
 	ALPNProtocols    []string   `json:"alpnProtocols,omitempty" toml:"alpnProtocols,omitempty" yaml:"alpnProtocols,omitempty" export:"true"`
+
+	// Deprecated: https://github.com/golang/go/issues/45430
+	PreferServerCipherSuites *bool `json:"preferServerCipherSuites,omitempty" toml:"preferServerCipherSuites,omitempty" yaml:"preferServerCipherSuites,omitempty" export:"true"`
 }
 
 // SetDefaults sets the default values for an Options struct.

pkg/tls/tlsmanager.go

@@ -68,6 +68,13 @@ func (m *Manager) UpdateConfigs(ctx context.Context, stores map[string]Store, co
 	defer m.lock.Unlock()
 
 	m.configs = configs
+	for optionName, option := range m.configs {
+		// Handle `PreferServerCipherSuites` depreciation
+		if option.PreferServerCipherSuites != nil {
+			log.Ctx(ctx).Warn().Msgf("TLSOption %q uses `PreferServerCipherSuites` option, but this option is deprecated and ineffective, please remove this option.", optionName)
+		}
+	}
+
 	m.storesConfig = stores
 	m.certs = certs
 

pkg/tls/zz_generated.deepcopy.go

@@ -116,6 +116,11 @@ func (in *Options) DeepCopyInto(out *Options) {
 		*out = make([]string, len(*in))
 		copy(*out, *in)
 	}
+	if in.PreferServerCipherSuites != nil {
+		in, out := &in.PreferServerCipherSuites, &out.PreferServerCipherSuites
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }