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<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}

if ( ! class_exists( 'PostmanAdminController' ) ) {

	require_once 'PostmanOptions.php';
	require_once 'PostmanState.php';
	require_once 'PostmanState.php';
	require_once 'PostmanOAuthToken.php';
	require_once 'Postman-Connectivity-Test/Postman-PortTest.php';
	require_once 'Postman-Configuration/PostmanSmtpDiscovery.php';
	require_once 'PostmanInputSanitizer.php';
	require_once 'Postman-Configuration/PostmanImportableConfiguration.php';
	require_once 'PostmanConfigTextHelper.php';
	require_once 'PostmanAjaxController.php';
	require_once 'PostmanViewController.php';
	require_once 'PostmanPreRequisitesCheck.php';
	require_once 'Postman-Auth/PostmanAuthenticationManagerFactory.php';

	class PostmanAdminController {

		// this is the slug used in the URL
		const MANAGE_OPTIONS_PAGE_SLUG = 'postman/manage-options';

		// NONCE NAMES
		const PURGE_DATA_SLUG = 'postman_purge_data';
		const IMPORT_SETTINGS_SLUG = 'postman_import_settings';

		// The Postman Group is used for saving data, make sure it is globally unique
		const SETTINGS_GROUP_NAME = 'postman_group';

		// a database entry specifically for the form that sends test e-mail
		const TEST_OPTIONS = 'postman_test_options';
		const SMTP_OPTIONS = 'postman_smtp_options';
		const SMTP_SECTION = 'postman_smtp_section';
		const BASIC_AUTH_OPTIONS = 'postman_basic_auth_options';
		const BASIC_AUTH_SECTION = 'postman_basic_auth_section';
		const OAUTH_AUTH_OPTIONS = 'postman_oauth_options';
		const OAUTH_SECTION = 'postman_oauth_section';
		const MESSAGE_SENDER_OPTIONS = 'postman_message_sender_options';
		const MESSAGE_SENDER_SECTION = 'postman_message_sender_section';
		const MESSAGE_FROM_OPTIONS = 'postman_message_from_options';
		const MESSAGE_FROM_SECTION = 'postman_message_from_section';
		const MESSAGE_OPTIONS = 'postman_message_options';
		const MESSAGE_SECTION = 'postman_message_section';
		const MESSAGE_HEADERS_OPTIONS = 'postman_message_headers_options';
		const MESSAGE_HEADERS_SECTION = 'postman_message_headers_section';
		const NETWORK_OPTIONS = 'postman_network_options';
		const NETWORK_SECTION = 'postman_network_section';
		const LOGGING_OPTIONS = 'postman_logging_options';
		const LOGGING_SECTION = 'postman_logging_section';
		const MULTISITE_OPTIONS = 'postman_multisite_options';
		const MULTISITE_SECTION = 'postman_multisite_section';
		const ADVANCED_OPTIONS = 'postman_advanced_options';
		const ADVANCED_SECTION = 'postman_advanced_section';
		const EMAIL_VALIDATION_SECTION = 'postman_email_validation_section';
		const EMAIL_VALIDATION_OPTIONS = 'postman_email_validation_options';

		// slugs
		const POSTMAN_TEST_SLUG = 'postman-test';

		// logging
		private $logger;

		// Holds the values to be used in the fields callbacks
		private $rootPluginFilenameAndPath;
		private $options;
		private $authorizationToken;
		private $importableConfiguration;

		// helpers
		private $messageHandler;
		private $oauthScribe;
		private $wpMailBinder;

		/**
		 * Constructor
		 *
		 * @param mixed               $rootPluginFilenameAndPath
		 * @param PostmanOptions        $options
		 * @param PostmanOAuthToken     $authorizationToken
		 * @param PostmanMessageHandler $messageHandler
		 * @param PostmanWpMailBinder   $binder
		 */
		public function __construct( $rootPluginFilenameAndPath, PostmanOptions $options, PostmanOAuthToken $authorizationToken, PostmanMessageHandler $messageHandler, PostmanWpMailBinder $binder ) {
			assert( ! empty( $rootPluginFilenameAndPath ) );
			assert( ! empty( $options ) );
			assert( ! empty( $authorizationToken ) );
			assert( ! empty( $messageHandler ) );
			assert( ! empty( $binder ) );
			assert( PostmanUtils::isAdmin() );
			assert( is_admin() );

			$this->logger = new PostmanLogger( get_class( $this ) );
			$this->options = $options;
			$this->authorizationToken = $authorizationToken;
			$this->messageHandler = $messageHandler;
			$this->rootPluginFilenameAndPath = $rootPluginFilenameAndPath;
			$this->wpMailBinder = $binder;

			// check if the user saved data, and if validation was successful
			$session = PostmanSession::getInstance();
			if ( $session->isSetAction() ) {
				$this->logger->debug( sprintf( 'session action: %s', $session->getAction() ) );
			}
			if ( $session->getAction() == PostmanInputSanitizer::VALIDATION_SUCCESS ) {
				// unset the action
				$session->unsetAction();
				// do a redirect on the init hook
				$this->registerInitFunction( 'handleSuccessfulSave' );
				// add a saved message to be shown after the redirect
				$this->messageHandler->addMessage( _x( 'Settings saved.', 'The plugin successfully saved new settings.', 'post-smtp' ) );
				return;
			} else {
				// unset the action in the failed case as well
				$session->unsetAction();
			}

			// test to see if an OAuth authentication is in progress
			if ( $session->isSetOauthInProgress() ) {
				// there is only a three minute window that Postman will expect a Grant Code, once Grant is clicked by the user
				$this->logger->debug( 'Looking for grant code' );
				if ( isset( $_GET ['code'] ) ) {
					$this->logger->debug( 'Found authorization grant code' );

					// queue the function that processes the incoming grant code
					$this->registerInitFunction( 'handleAuthorizationGrant' );
					return;
				}
			}
            do_action('post_smtp_handle_oauth', $this->messageHandler );

			// continue to initialize the AdminController
			add_action( 'init', array(
					$this,
					'on_init',
			) );

            // continue to initialize the AdminController
            add_action( 'wpmu_options', array(
                $this,
                'wpmu_options',
            ) );

            add_action( 'update_wpmu_options', array(
                $this,
                'update_wpmu_options',
            ) );

			// Adds "Settings" link to the plugin action page
			add_filter( 'plugin_action_links_' . plugin_basename( $this->rootPluginFilenameAndPath ), array(
					$this,
					'postmanModifyLinksOnPluginsListPage',
			) );

			require_once( 'PostmanPluginFeedback.php' );
		}


		function wpmu_options() {
		    $options = get_site_option( PostmanOptions::POSTMAN_NETWORK_OPTIONS );
		    ?>
            <input type="hidden" name="<?php echo PostmanOptions::POSTMAN_NETWORK_OPTIONS; ?>[post_smtp_global_settings]" value="null">
            <input type="hidden" name="<?php echo PostmanOptions::POSTMAN_NETWORK_OPTIONS; ?>[post_smtp_allow_overwrite]" value="null">
            <h2><?php _e( 'Post SMTP Settings', 'post-smtp' ); ?></h2>
            <table id="menu" class="form-table">
                <tr>
                    <th scope="row">
                        <?php _e( 'Enable global settings', 'post-smtp' ); ?>
                    </th>
                    <td>
                        <?php $checked = checked( $options['post_smtp_global_settings'], 1, false ); ?>
                        <label for="post-smtp-global-settings">
                            <input id="post-smtp-global-settings" type="checkbox"
                                   name="<?php echo PostmanOptions::POSTMAN_NETWORK_OPTIONS; ?>[post_smtp_global_settings]"
                                   value="1"
                                   <?php echo $checked; ?>
                            >
                            <p class="description">
                                <?php _e('Same settings as the main site/blog (id:1)', 'post-smtp' ); ?>
                            </p>
                        </label>
                    </td>
                </tr>
                <tr>
                    <th scope="row">
                        <?php _e( 'Allow user to load saved options', 'post-smtp' ); ?>
                    </th>
                    <td>
                        <?php $checked = checked( $options['post_smtp_allow_overwrite'], 1, false ); ?>
                        <label for="post-smtp-allow-overwrite">
                            <input id="post-smtp-allow-overwrite" type="checkbox"
                                   name="<?php echo PostmanOptions::POSTMAN_NETWORK_OPTIONS; ?>[post_smtp_allow_overwrite]"
                                   value="1"
                                <?php echo $checked; ?>
                            >
                        </label>
                    </td>
                </tr>
            </table>
            <?php
        }

        function update_wpmu_options() {
            $options = get_site_option( PostmanOptions::POSTMAN_NETWORK_OPTIONS );
		    if ( isset( $_POST[ PostmanOptions::POSTMAN_NETWORK_OPTIONS ] ) ) {
		        foreach ( $_POST[ PostmanOptions::POSTMAN_NETWORK_OPTIONS ] as $key => $value ) {
                    $options[$key] = sanitize_text_field( $value );

                    if ( $value == 'null' ) {
                        unset( $options[$key] );
                    }
                }

                update_site_option( PostmanOptions::POSTMAN_NETWORK_OPTIONS, $options );
            } else {
                update_site_option( PostmanOptions::POSTMAN_NETWORK_OPTIONS, array() );
            }
        }

		/**
		 * Functions to execute on the init event
		 *
		 * "Typically used by plugins to initialize. The current user is already authenticated by this time."
		 * ref: http://codex.wordpress.org/Plugin_API/Action_Reference#Actions_Run_During_a_Typical_Request
		 */
		public function on_init() {
			// only administrators should be able to trigger this
			if ( PostmanUtils::isAdmin() ) {
								$transport = PostmanTransportRegistry::getInstance()->getCurrentTransport();
				$this->oauthScribe = $transport->getScribe();

				// register content handlers
				$viewController = new PostmanViewController( $this->rootPluginFilenameAndPath, $this->options, $this->authorizationToken, $this->oauthScribe, $this );

				// register action handlers
				$this->registerAdminPostAction( self::PURGE_DATA_SLUG, 'handlePurgeDataAction' );
				$this->registerAdminPostAction( self::IMPORT_SETTINGS_SLUG, 'importSettingsAction' );
				$this->registerAdminPostAction( PostmanUtils::REQUEST_OAUTH2_GRANT_SLUG, 'handleOAuthPermissionRequestAction' );

				if ( PostmanUtils::isCurrentPagePostmanAdmin() ) {
					$this->checkPreRequisites();
				}
			}
		}

		/**
		 *
		 */
		private function checkPreRequisites() {
			$states = PostmanPreRequisitesCheck::getState();
			foreach ( $states as $state ) {
				if ( ! $state ['ready'] ) {
					/* Translators: where %1$s is the name of the library */
					$message = sprintf( __( 'This PHP installation requires the <b>%1$s</b> library.', 'post-smtp' ), $state ['name'] );
					if ( $state ['required'] ) {
						$this->messageHandler->addError( $message );
					} else {
						// $this->messageHandler->addWarning ( $message );
					}
				}
			}
		}

		/**
		 *
		 * @param mixed $actionName
		 * @param mixed $callbackName
		 */
		private function registerInitFunction( $callbackName ) {
			$this->logger->debug( 'Registering init function ' . $callbackName );
			add_action( 'init', array(
					$this,
					$callbackName,
			) );
		}

		/**
		 * Registers actions posted by am HTML FORM with the WordPress 'action' parameter
		 *
		 * @param mixed $actionName
		 * @param mixed $callbankName
		 */
		private function registerAdminPostAction( $actionName, $callbankName ) {
			// $this->logger->debug ( 'Registering ' . $actionName . ' Action Post handler' );
			add_action( 'admin_post_' . $actionName, array(
					$this,
					$callbankName,
			) );
		}

		/**
		 * Add "Settings" link to the plugin action page
		 *
		 * @param mixed $links
		 * @return multitype:
		 */
		public function postmanModifyLinksOnPluginsListPage( $links ) {
			// only administrators should be able to trigger this
			if ( PostmanUtils::isAdmin() ) {
				$mylinks = array(
                        //sprintf( '<a href="%s" target="_blank" class="postman_settings">%s</a>', 'https://www.paypal.com/cgi-bin/webscr?cmd=_xclick&business=yehudahas@gmail.com&item_name=Donation+for+PostSMTP', __( 'Donate', 'post-smtp' ) ),
						sprintf( '<a href="%s" class="postman_settings">%s</a>', PostmanUtils::getSettingsPageUrl(), __( 'Settings', 'post-smtp' ) ),
						sprintf( '<a href="%s" class="postman_settings">%s</a>', 'https://postmansmtp.com', __( 'Visit us', 'post-smtp' ) ),
				);
				return array_merge( $mylinks, $links );
			}
		}

		/**
		 * This function runs after a successful, error-free save
		 */
		public function handleSuccessfulSave() {
			// WordPress likes to keep GET parameters around for a long time
			// (something in the call to settings_fields() does this)
			// here we redirect after a successful save to clear those parameters
			PostmanUtils::redirect( PostmanUtils::POSTMAN_HOME_PAGE_RELATIVE_URL );
		}

		/**
		 * This function handle the request to import plugin data
		 */
		public function importSettingsAction() {
			$this->logger->debug( 'is wpnonce import-settings?' );
			$success = true;
			if ( wp_verify_nonce( $_REQUEST ['_wpnonce'], PostmanAdminController::IMPORT_SETTINGS_SLUG ) ) {
				$success = PostmanOptions::getInstance()->import( sanitize_textarea_field($_POST ['settings']) );
			} else {
				$success = false;
			}
			if ( ! $success ) {
				$this->messageHandler->addError( __( 'There was an error importing the data.', 'post-smtp' ) );
				$this->logger->error( 'There was an error importing the data' );
			}
			PostmanUtils::redirect( PostmanUtils::POSTMAN_HOME_PAGE_RELATIVE_URL );
		}
		/**
		 * This function handle the request to purge plugin data
		 */
		public function handlePurgeDataAction() {
			$this->logger->debug( 'is wpnonce purge-data?' );
			if ( wp_verify_nonce( $_REQUEST ['_wpnonce'], PostmanAdminController::PURGE_DATA_SLUG ) ) {
				$this->logger->debug( 'Purging stored data' );
				delete_option( PostmanOptions::POSTMAN_OPTIONS );
				delete_option( PostmanOAuthToken::OPTIONS_NAME );
				delete_option( PostmanAdminController::TEST_OPTIONS );
				$logPurger = new PostmanEmailLogPurger();
				$logPurger->removeAll();
				$this->messageHandler->addMessage( __( 'Plugin data was removed.', 'post-smtp' ) );
				PostmanUtils::redirect( PostmanUtils::POSTMAN_HOME_PAGE_RELATIVE_URL );
			}
		}

		/**
		 * Handles the authorization grant
		 */
		function handleAuthorizationGrant() {
			$logger = $this->logger;
			$options = $this->options;
			$authorizationToken = $this->authorizationToken;
			$logger->debug( 'Authorization in progress' );
			$transactionId = PostmanSession::getInstance()->getOauthInProgress();

			// begin transaction
			PostmanUtils::lock();

			$authenticationManager = PostmanAuthenticationManagerFactory::getInstance()->createAuthenticationManager();
			try {
				if ( $authenticationManager->processAuthorizationGrantCode( $transactionId ) ) {
					$logger->debug( 'Authorization successful' );
					// save to database
					$authorizationToken->save();
					$this->messageHandler->addMessage( __( 'The OAuth 2.0 authorization was successful. Ready to send e-mail.', 'post-smtp' ) );
				} else {
					$this->messageHandler->addError( __( 'Your email provider did not grant Postman permission. Try again.', 'post-smtp' ) );
				}
			} catch ( PostmanStateIdMissingException $e ) {
				$this->messageHandler->addError( __( 'The grant code from Google had no accompanying state and may be a forgery', 'post-smtp' ) );
			} catch ( Exception $e ) {
				$logger->error( 'Error: ' . get_class( $e ) . ' code=' . $e->getCode() . ' message=' . $e->getMessage() );
				/* translators: %s is the error message */
				$this->messageHandler->addError( sprintf( __( 'Error authenticating with this Client ID. [%s]', 'post-smtp' ), '<em>' . $e->getMessage() . '</em>' ) );
			}

			// clean-up
			PostmanUtils::unlock();
			PostmanSession::getInstance()->unsetOauthInProgress();

			// redirect home
			PostmanUtils::redirect( PostmanUtils::POSTMAN_HOME_PAGE_RELATIVE_URL );
		}

		/**
		 * This method is called when a user clicks on a "Request Permission from Google" link.
		 * This link will create a remote API call for Google and redirect the user from WordPress to Google.
		 * Google will redirect back to WordPress after the user responds.
		 */
		public function handleOAuthPermissionRequestAction() {
			$this->logger->debug( 'handling OAuth Permission request' );
			$authenticationManager = PostmanAuthenticationManagerFactory::getInstance()->createAuthenticationManager();
			$transactionId = $authenticationManager->generateRequestTransactionId();
			PostmanSession::getInstance()->setOauthInProgress( $transactionId );
			$authenticationManager->requestVerificationCode( $transactionId );
		}
	}
}