Add support for and use socket host override. (#1682)

* Add support for and use socket host override. Closes #1378

* Fix embeds with the new websocket constructor

controllers/admin/config.go

@@ -408,6 +408,25 @@ func SetServerURL(w http.ResponseWriter, r *http.Request) {
 	controllers.WriteSimpleResponse(w, true, "server url set")
 }
 
+// SetSocketHostOverride will set the host override for the websocket.
+func SetSocketHostOverride(w http.ResponseWriter, r *http.Request) {
+	if !requirePOST(w, r) {
+		return
+	}
+
+	configValue, success := getValueFromRequest(w, r)
+	if !success {
+		return
+	}
+
+	if err := data.SetWebsocketOverrideHost(configValue.Value.(string)); err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+		return
+	}
+
+	controllers.WriteSimpleResponse(w, true, "websocket host override set")
+}
+
 // SetDirectoryEnabled will handle the web config request to enable or disable directory registration.
 func SetDirectoryEnabled(w http.ResponseWriter, r *http.Request) {
 	if !requirePOST(w, r) {

controllers/admin/serverConfig.go

@@ -53,6 +53,7 @@ func GetServerConfig(w http.ResponseWriter, r *http.Request) {
 		RTMPServerPort:          data.GetRTMPPortNumber(),
 		ChatDisabled:            data.GetChatDisabled(),
 		ChatJoinMessagesEnabled: data.GetChatJoinMessagesEnabled(),
+		SocketHostOverride:      data.GetWebsocketOverrideHost(),
 		VideoSettings: videoSettings{
 			VideoQualityVariants: videoQualityVariants,
 			LatencyLevel:         data.GetStreamLatencyLevel().Level,
@@ -103,6 +104,7 @@ type serverConfigAdminResponse struct {
 	ForbiddenUsernames      []string                 `json:"forbiddenUsernames"`
 	Federation              federationConfigResponse `json:"federation"`
 	SuggestedUsernames      []string                 `json:"suggestedUsernames"`
+	SocketHostOverride      string                   `json:"socketHostOverride,omitempty"`
 }
 
 type videoSettings struct {