Noptin_Ajax::add_subscriber()

	public function add_subscriber() {

		// Verify nonce.
		if ( noptin_verify_subscription_nonces() ) {
			check_ajax_referer( 'noptin' );
		}

		// avoid bot submissions.
		if ( ! empty( $_POST['noptin_confirm_submit'] ) ) {
			return;
		}

		/**
		 * Fires before a subscriber is added via ajax.
		 * 
		 * @since 1.2.4
		 */
		do_action( 'noptin_before_add_ajax_subscriber' );

		// Prepare form fields.
		$form = 0;

		if ( empty( $_POST['noptin_form_id'] ) ) {

			$fields = array(
				array(
					'type'      => array(
						'label' => __( 'Email Address', 'newsletter-optin-box' ),
						'name'  => 'email',
						'type'  => 'email',
					),
					'require' => 'true',
					'key'     => 'email',
				),
			);

		} else {

			// Get the form.
			$form = noptin_get_optin_form( $_POST['noptin_form_id'] );

			if ( empty( $form ) || ! $form->is_published() ) {
				echo __( 'This form is in-active.', 'newsletter-optin-box' );
				exit;
			}

			$fields = $form->fields;
		}

		$filtered = array();

		// Check gdpr.
		if ( is_object( $form ) && $form->gdprCheckbox && empty( $_POST['noptin_gdpr_checkbox'] ) ) {
			echo __( 'You must consent to receive promotional emails.', 'newsletter-optin-box' );
			exit;
		}

		if ( ! empty( $_POST['noptin_gdpr_checkbox'] ) ) {
			$filtered['GDPR_consent'] = 1;
		}

		foreach ( $fields as $field ) {

			$type = $field['type']['type'];

			// Prepare the field name.
			$name = '';

			if ( 'email' == $type ) {
				$name = 'email';
			}

			if ( 'first_name' == $type ) {
				$name = 'first_name';
			}

			if ( 'last_name' == $type ) {
				$name = 'last_name';
			}

			if ( 'name' == $type ) {
				$name = 'name';
			}

			if ( empty( $name ) ) {
				$name = $field['type']['name'];
			}

			$key = esc_attr( $field['key'] );

			if ( isset( $_POST[ $key ] ) ) {
				$value = $_POST[ $key ];
			} else {
				$value = '';
			}

			// required fields.
			if ( ! empty( $field['require'] ) && 'false' !== $field['require'] && empty( $value ) ) {
				die( __( 'Ensure that you fill all required fields.', 'newsletter-optin-box' ) );
			}

			// Sanitize email fields.
			if ( 'email' === $type && ! empty( $value ) ) {

				$value = sanitize_email( $value );
				if ( empty( $value ) ) {
					die( __( 'That email address is not valid.', 'newsletter-optin-box' ) );
				}

			}

			// Sanitize checkboxes.
			if ( 'checkbox' === $type && empty( $value ) ) {
				$value = __( 'No', 'newsletter-optin-box' );
			}

			// Sanitize text fields.
			if ( 'textarea' !== $type && ! is_array( $value ) ) {
				$value = sanitize_text_field( urldecode( $value ) );
			} else {
				if ( ! is_array( $value ) ) {
					$value = esc_html( urldecode( $value ) );
				}
			}

			$filtered[ $name ] = $value;

		}

		// Add the subscriber's IP address.
		$address = noptin_get_user_ip();
		if ( ! empty( $address ) && '::1' !== $address ) {
			$filtered['ip_address'] = $address;
		}

		if ( ! empty( $_POST['conversion_page'] ) ) {
			$filtered['conversion_page'] = esc_url_raw( trim( $_POST['conversion_page'] ) );
		}

		if ( is_object( $form ) ) {
			$filtered['_subscriber_via'] = $form->ID;
		}

		/**
		 * Filters subscriber details when adding a new subscriber via ajax.
		 * 
		 * @since 1.2.4
		 */
		$filtered = apply_filters( 'noptin_add_ajax_subscriber_filter_details', wp_unslash( $filtered ), $form );
		$inserted = add_noptin_subscriber( $filtered );

		if ( is_string( $inserted ) ) {
			die( $inserted );
		}

		do_action( 'noptin_add_ajax_subscriber', $inserted, $form );

		$result = array(
			'action' => 'msg',
			'msg'    => get_noptin_option( 'success_message' ),
		);

		if ( empty( $result['msg'] ) ) {
			$result['msg'] = esc_html__( 'Thanks for subscribing to the newsletter', 'newsletter-optin-box' );
		}

		if ( is_object( $form ) ) {

			$count = (int) get_post_meta( $form->ID, '_noptin_subscribers_count', true );
			update_post_meta( $form->ID, '_noptin_subscribers_count', $count + 1 );

			// msg.
			if ( $form->subscribeAction === 'message' ) {
				$result['msg'] = $form->successMessage;
			} else {
				// redirects.
				$result['action']   = 'redirect';
				$result['redirect'] = $form->redirectUrl;
			}
		}

		wp_send_json( $result );
		exit;

	}