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wp-content/plugins/gravitysmtp/includes/feature-flags/class-feature-flag-repository.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Feature_Flags;
+
+use Gravity_Forms\Gravity_SMTP\Gravity_SMTP;
+
+class Feature_Flag_Repository {
+
+	const FILTER_ALL_FEATURE_FLAGS   = 'gravitysmtp_feature_flags';
+	const FILTER_SINGLE_FEATURE_FLAG = 'gravitysmtp_feature_flag';
+
+	public function flags() {
+		return apply_filters( self::FILTER_ALL_FEATURE_FLAGS, array() );
+	}
+
+	public function add( $flag_slug, $flag_label ) {
+		add_filter( self::FILTER_ALL_FEATURE_FLAGS, function( $flags ) use ( $flag_slug, $flag_label ) {
+			$flags[ $flag_slug ] = $flag_label;
+
+			return $flags;
+		} );
+	}
+
+	public function is_enabled( $flag_slug ) {
+		return apply_filters( self::FILTER_SINGLE_FEATURE_FLAG, false, $flag_slug );
+	}
+
+	public function enable_flag( $flag_slug, $priority = PHP_INT_MAX ) {
+		add_filter( self::FILTER_SINGLE_FEATURE_FLAG, function ( $is_enabled, $checked_flag ) use ( $flag_slug ) {
+			if ( $checked_flag === $flag_slug ) {
+				return true;
+			}
+
+			return $is_enabled;
+		}, $priority, 2 );
+	}
+
+	public function disable_flag( $flag_slug, $priority = PHP_INT_MAX ) {
+		add_filter( self::FILTER_SINGLE_FEATURE_FLAG, function ( $is_enabled, $checked_flag ) use ( $flag_slug ) {
+			if ( $checked_flag === $flag_slug ) {
+				return false;
+			}
+
+			return $is_enabled;
+		}, $priority, 2 );
+	}
+
+	public function enabled_flags() {
+		$all_flags = $this->flags();
+		$self      = $this;
+
+		return array_filter( $all_flags, function ( $flag_slug ) use ( $self ) {
+			return $this->is_enabled( $flag_slug );
+		}, ARRAY_FILTER_USE_KEY );
+	}
+
+	public function flags_by_status() {
+		$all_flags = $this->flags();
+		$response  = array();
+
+		foreach ( $all_flags as $flag_slug => $label ) {
+			$response[ $flag_slug ] = $this->is_enabled( $flag_slug );
+		}
+
+		return $response;
+	}
+}