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<?php
namespace Yoast\WP\SEO\Presenters;
use Yoast\WP\SEO\Helpers\Robots_Txt_Helper;
/**
* Presenter class for the robots.txt file helper.
*/
class Robots_Txt_Presenter extends Abstract_Presenter {
public const YOAST_OUTPUT_BEFORE_COMMENT = '# START YOAST BLOCK' . \PHP_EOL . '# ---------------------------' . \PHP_EOL;
public const YOAST_OUTPUT_AFTER_COMMENT = '# ---------------------------' . \PHP_EOL . '# END YOAST BLOCK';
/**
* Text to be outputted for the allow directive.
*
* @var string
*/
public const ALLOW_DIRECTIVE = 'Allow';
/**
* Text to be outputted for the disallow directive.
*
* @var string
*/
public const DISALLOW_DIRECTIVE = 'Disallow';
/**
* Text to be outputted for the user-agent rule.
*
* @var string
*/
public const USER_AGENT_FIELD = 'User-agent';
/**
* Text to be outputted for the sitemap rule.
*
* @var string
*/
public const SITEMAP_FIELD = 'Sitemap';
/**
* Holds the Robots_Txt_Helper.
*
* @var Robots_Txt_Helper
*/
protected $robots_txt_helper;
/**
* Constructor.
*
* @param Robots_Txt_Helper $robots_txt_helper The robots txt helper.
*/
public function __construct( Robots_Txt_Helper $robots_txt_helper ) {
$this->robots_txt_helper = $robots_txt_helper;
}
/**
* Generate content to be placed in a robots.txt file.
*
* @return string Content to be placed in a robots.txt file.
*/
public function present() {
$robots_txt_content = self::YOAST_OUTPUT_BEFORE_COMMENT;
$robots_txt_content = $this->handle_user_agents( $robots_txt_content );
$robots_txt_content = $this->handle_site_maps( $robots_txt_content );
return $robots_txt_content . self::YOAST_OUTPUT_AFTER_COMMENT;
}
/**
* Adds user agent directives to the robots txt output string.
*
* @param array $user_agents The list if available user agents.
* @param string $robots_txt_content The current working robots txt string.
*
* @return string
*/
private function add_user_agent_directives( $user_agents, $robots_txt_content ) {
foreach ( $user_agents as $user_agent ) {
$robots_txt_content .= self::USER_AGENT_FIELD . ': ' . $user_agent->get_user_agent() . \PHP_EOL;
$robots_txt_content = $this->add_directive_path( $robots_txt_content, $user_agent->get_disallow_paths(), self::DISALLOW_DIRECTIVE );
$robots_txt_content = $this->add_directive_path( $robots_txt_content, $user_agent->get_allow_paths(), self::ALLOW_DIRECTIVE );
$robots_txt_content .= \PHP_EOL;
}
return $robots_txt_content;
}
/**
* Adds user agent directives path content to the robots txt output string.
*
* @param string $robots_txt_content The current working robots txt string.
* @param array $paths The list of paths for which to add a txt entry.
* @param string $directive_identifier The identifier for the directives. (Disallow of Allow).
*
* @return string
*/
private function add_directive_path( $robots_txt_content, $paths, $directive_identifier ) {
if ( \count( $paths ) > 0 ) {
foreach ( $paths as $path ) {
$robots_txt_content .= $directive_identifier . ': ' . $path . \PHP_EOL;
}
}
return $robots_txt_content;
}
/**
* Handles adding user agent content to the robots txt content if there is any.
*
* @param string $robots_txt_content The current working robots txt string.
*
* @return string
*/
private function handle_user_agents( $robots_txt_content ) {
$user_agents = $this->robots_txt_helper->get_robots_txt_user_agents();
if ( ! isset( $user_agents['*'] ) ) {
$robots_txt_content .= 'User-agent: *' . \PHP_EOL;
$robots_txt_content .= 'Disallow:' . \PHP_EOL . \PHP_EOL;
}
$robots_txt_content = $this->add_user_agent_directives( $user_agents, $robots_txt_content );
return $robots_txt_content;
}
/**
* Handles adding sitemap content to the robots txt content.
*
* @param string $robots_txt_content The current working robots txt string.
*
* @return string
*/
private function handle_site_maps( $robots_txt_content ) {
$registered_sitemaps = $this->robots_txt_helper->get_sitemap_rules();
foreach ( $registered_sitemaps as $sitemap ) {
$robots_txt_content .= self::SITEMAP_FIELD . ': ' . $sitemap . \PHP_EOL;
}
return $robots_txt_content;
}
}