Require authentication to participate in chat (#4762)

* feat(chat): require authentication to participate in chat

* fix: it's pretty much impossible to bypass the auth requirement, addressing review feedback anyway

* feat(chat): render chat text input as disabled if chat auth is required

* Commit updated API documentation

---------

Co-authored-by: Owncast <owncast@owncast.online>

persistence/configrepository/configkeys.go

@@ -46,6 +46,7 @@ const (
 	chatEstablishedUsersOnlyModeKey = "chat_established_users_only_mode"
 	chatSpamProtectionEnabledKey    = "chat_spam_protection_enabled"
 	chatSlurFilterEnabledKey        = "chat_slur_filter_enabled"
+	chatRequireAuthenticationKey    = "chat_require_authentication"
 	notificationsEnabledKey         = "notifications_enabled"
 	discordConfigurationKey         = "discord_configuration"
 	browserPushConfigurationKey     = "browser_push_configuration"

persistence/configrepository/configrepository.go

@@ -67,6 +67,8 @@ type ConfigRepository interface {
 	GetChatSpamProtectionEnabled() bool
 	SetChatSlurFilterEnabled(enabled bool) error
 	GetChatSlurFilterEnabled() bool
+	SetChatRequireAuthentication(enabled bool) error
+	GetChatRequireAuthentication() bool
 	GetExternalActions() []models.ExternalAction
 	SetExternalActions(actions []models.ExternalAction) error
 	SetCustomStyles(styles string) error

persistence/configrepository/sqlconfigrepository.go

@@ -541,6 +541,21 @@ func (r *SqlConfigRepository) GetChatSlurFilterEnabled() bool {
 	return false
 }
 
+// SetChatRequireAuthentication will set if authentication is required for chat.
+func (r *SqlConfigRepository) SetChatRequireAuthentication(enabled bool) error {
+	return r.datastore.SetBool(chatRequireAuthenticationKey, enabled)
+}
+
+// GetChatRequireAuthentication will return if authentication is required for chat.
+func (r *SqlConfigRepository) GetChatRequireAuthentication() bool {
+	enabled, err := r.datastore.GetBool(chatRequireAuthenticationKey)
+	if err == nil {
+		return enabled
+	}
+
+	return false
+}
+
 // GetExternalActions will return the registered external actions.
 func (r *SqlConfigRepository) GetExternalActions() []models.ExternalAction {
 	configEntry, err := r.datastore.Get(externalActionsKey)