woocommerce/includes/abstracts/abstract-wc-settings-api.php

<?php
/**
 * Admin Settings API used by Shipping Methods and Payment Gateways
 *
 * @class    WC_Settings_API
 * @version  2.3.0
 * @package  WooCommerce/Abstracts
 * @category Abstract Class
 * @author   WooThemes
 */
abstract class WC_Settings_API {

	/**
	 * The plugin ID. Used for option names.
	 * @var string
	 */
	public $plugin_id = 'woocommerce_';

	/**
	 * Method ID.
	 * @var string
	 */
	public $id = '';

	/**
	 * Method title.
	 * @var string
	 */
	public $method_title = '';

	/**
	 * Method description.
	 * @var string
	 */
	public $method_description = '';

	/**
	 * 'yes' if the method is enabled
	 * @var string
	 */
	public $enabled;

	/**
	 * Setting values.
	 * @var array
	 */
	public $settings = array();

	/**
	 * Form option fields.
	 * @var array
	 */
	public $form_fields = array();

	/**
	 * Validation errors.
	 * @var array
	 */
	public $errors = array();

	/**
	 * Sanitized fields after validation.
	 * @var array
	 */
	public $sanitized_fields = array();

	/**
	 * Admin Options
	 *
	 * Setup the gateway settings screen.
	 * Override this in your gateway.
	 *
	 * @since 1.0.0
	 */
	public function admin_options() { ?>

		<h3><?php echo ( ! empty( $this->method_title ) ) ? $this->method_title : __( 'Settings', 'woocommerce' ) ; ?></h3>

		<?php echo ( ! empty( $this->method_description ) ) ? wpautop( $this->method_description ) : ''; ?>

		<table class="form-table">
			<?php $this->generate_settings_html(); ?>
		</table><?php
	}

	/**
	 * Initialise Settings Form Fields
	 *
	 * Add an array of fields to be displayed
	 * on the gateway's settings screen.
	 *
	 * @since  1.0.0
	 * @return string
	 */
	public function init_form_fields() {}

	/**
	 * Get the form fields after they are initialized
	 * @return array of options
	 */
	public function get_form_fields() {
		return apply_filters( 'woocommerce_settings_api_form_fields_' . $this->id, $this->form_fields );
	}

	/**
	 * Admin Panel Options Processing
	 * - Saves the options to the DB
	 *
	 * @since 1.0.0
	 * @return bool
	 */
	public function process_admin_options() {

		$this->validate_settings_fields();

		if ( count( $this->errors ) > 0 ) {
			$this->display_errors();
			return false;
		} else {
			update_option( $this->plugin_id . $this->id . '_settings', apply_filters( 'woocommerce_settings_api_sanitized_fields_' . $this->id, $this->sanitized_fields ) );
			$this->init_settings();
			return true;
		}
	}

	/**
	 * Display admin error messages.
	 *
	 * @since 1.0.0
	 */
	public function display_errors() {}

	/**
	 * Initialise Gateway Settings
	 *
	 * Store all settings in a single database entry
	 * and make sure the $settings array is either the default
	 * or the settings stored in the database.
	 *
	 * @since 1.0.0
	 * @uses get_option(), add_option()
	 */
	public function init_settings() {

		// Load form_field settings
		$this->settings = get_option( $this->plugin_id . $this->id . '_settings', null );

		if ( ! $this->settings || ! is_array( $this->settings ) ) {

			$this->settings = array();

			// If there are no settings defined, load defaults
			if ( $form_fields = $this->get_form_fields() ) {

				foreach ( $form_fields as $k => $v ) {
					$this->settings[ $k ] = isset( $v['default'] ) ? $v['default'] : '';
				}
			}
		}

		if ( ! empty( $this->settings ) && is_array( $this->settings ) ) {
			$this->settings = array_map( array( $this, 'format_settings' ), $this->settings );
			$this->enabled  = isset( $this->settings['enabled'] ) && $this->settings['enabled'] == 'yes' ? 'yes' : 'no';
		}
	}

	/**
	 * get_option function.
	 *
	 * Gets and option from the settings API, using defaults if necessary to prevent undefined notices.
	 *
	 * @param  string $key
	 * @param  mixed  $empty_value
	 * @return mixed  The value specified for the option or a default value for the option
	 */
	public function get_option( $key, $empty_value = null ) {

		if ( empty( $this->settings ) ) {
			$this->init_settings();
		}

		// Get option default if unset
		if ( ! isset( $this->settings[ $key ] ) ) {
			$form_fields            = $this->get_form_fields();
			$this->settings[ $key ] = isset( $form_fields[ $key ]['default'] ) ? $form_fields[ $key ]['default'] : '';
		}

		if ( ! is_null( $empty_value ) && empty( $this->settings[ $key ] ) ) {
			$this->settings[ $key ] = $empty_value;
		}

		return $this->settings[ $key ];
	}

	/**
	 * Prefix key for settings.
	 *
	 * @param  mixed $key
	 * @return string
	 */
	public function get_field_key( $key ) {
		return $this->plugin_id . $this->id . '_' . $key;
	}

	/**
	 * Decode values for settings.
	 *
	 * @param  mixed $value
	 * @return array
	 */
	public function format_settings( $value ) {
		return is_array( $value ) ? $value : $value;
	}

	/**
	 * Generate Settings HTML.
	 *
	 * Generate the HTML for the fields on the "settings" screen.
	 *
	 * @param  array $form_fields (default: array())
	 * @since  1.0.0
	 * @uses   method_exists()
	 * @return string the html for the settings
	 */
	public function generate_settings_html( $form_fields = array() ) {

		if ( empty( $form_fields ) ) {
			$form_fields = $this->get_form_fields();
		}

		$html = '';
		foreach ( $form_fields as $k => $v ) {

			if ( ! isset( $v['type'] ) || ( $v['type'] == '' ) ) {
				$v['type'] = 'text'; // Default to "text" field type.
			}

			if ( method_exists( $this, 'generate_' . $v['type'] . '_html' ) ) {
				$html .= $this->{'generate_' . $v['type'] . '_html'}( $k, $v );
			} else {
				$html .= $this->{'generate_text_html'}( $k, $v );
			}
		}

		echo $html;
	}

	/**
	 * Get HTML for tooltips
	 *
	 * @param  array $data
	 * @return string
	 */
	public function get_tooltip_html( $data ) {
		if ( $data['desc_tip'] === true ) {
			$tip = $data['description'];
		} elseif ( ! empty( $data['desc_tip'] ) ) {
			$tip = $data['desc_tip'];
		} else {
			$tip = '';
		}

		return $tip ? '<img class="help_tip" data-tip="' . esc_attr( wc_sanitize_tooltip( $tip ) ) . '" src="' . WC()->plugin_url() . '/assets/images/help.png" height="16" width="16" />' : '';
	}

	/**
	 * Get HTML for descriptions
	 *
	 * @param  array $data
	 * @return string
	 */
	public function get_description_html( $data ) {

		if ( $data['desc_tip'] === true ) {
			$description = '';
		} elseif ( ! empty( $data['desc_tip'] ) ) {
			$description = $data['description'];
		} elseif ( ! empty( $data['description'] ) ) {
			$description = $data['description'];
		} else {
			$description = '';
		}

		return $description ? '<p class="description">' . wp_kses_post( $description ) . '</p>' . "\n" : '';
	}

	/**
	 * Get custom attributes
	 *
	 * @param  array $data
	 * @return string
	 */
	public function get_custom_attribute_html( $data ) {

		$custom_attributes = array();

		if ( ! empty( $data['custom_attributes'] ) && is_array( $data['custom_attributes'] ) ) {

			foreach ( $data['custom_attributes'] as $attribute => $attribute_value ) {
				$custom_attributes[] = esc_attr( $attribute ) . '="' . esc_attr( $attribute_value ) . '"';
			}
		}

		return implode( ' ', $custom_attributes );
	}

	/**
	 * Generate Text Input HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_text_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array()
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<input class="input-text regular-input <?php echo esc_attr( $data['class'] ); ?>" type="<?php echo esc_attr( $data['type'] ); ?>" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" value="<?php echo esc_attr( $this->get_option( $key ) ); ?>" placeholder="<?php echo esc_attr( $data['placeholder'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?> />
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Price Input HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_price_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array()
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<input class="wc_input_price input-text regular-input <?php echo esc_attr( $data['class'] ); ?>" type="text" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" value="<?php echo esc_attr( wc_format_localized_price( $this->get_option( $key ) ) ); ?>" placeholder="<?php echo esc_attr( $data['placeholder'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?> />
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Decimal Input HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_decimal_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array()
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<input class="wc_input_decimal input-text regular-input <?php echo esc_attr( $data['class'] ); ?>" type="text" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" value="<?php echo esc_attr( wc_format_localized_decimal( $this->get_option( $key ) ) ); ?>" placeholder="<?php echo esc_attr( $data['placeholder'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?> />
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Password Input HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_password_html( $key, $data ) {
		$data['type'] = 'password';
		return $this->generate_text_html( $key, $data );
	}

	/**
	 * Generate Color Picker Input HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_color_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array()
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<div class="color_box">
						<input class="colorpick <?php echo esc_attr( $data['class'] ); ?>" type="text" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" value="<?php echo esc_attr( $this->get_option( $key ) ); ?>" placeholder="<?php echo esc_attr( $data['placeholder'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?> />
						<div id="colorPickerDiv_<?php echo esc_attr( $field ); ?>" class="colorpickdiv" style="z-index: 100; background: #eee; border: 1px solid #ccc; position: absolute; display: none;"></div>
					</div>
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Textarea HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_textarea_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array()
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<textarea rows="3" cols="20" class="input-text wide-input <?php echo esc_attr( $data['class'] ); ?>" type="<?php echo esc_attr( $data['type'] ); ?>" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" placeholder="<?php echo esc_attr( $data['placeholder'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?>><?php echo esc_textarea( $this->get_option( $key ) ); ?></textarea>
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Checkbox HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_checkbox_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'label'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array()
		);

		$data = wp_parse_args( $data, $defaults );

		if ( ! $data['label'] ) {
			$data['label'] = $data['title'];
		}

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<label for="<?php echo esc_attr( $field ); ?>">
					<input <?php disabled( $data['disabled'], true ); ?> class="<?php echo esc_attr( $data['class'] ); ?>" type="checkbox" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" value="1" <?php checked( $this->get_option( $key ), 'yes' ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?> /> <?php echo wp_kses_post( $data['label'] ); ?></label><br/>
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Select HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_select_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array(),
			'options'           => array()
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<select class="select <?php echo esc_attr( $data['class'] ); ?>" name="<?php echo esc_attr( $field ); ?>" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?>>
						<?php foreach ( (array) $data['options'] as $option_key => $option_value ) : ?>
							<option value="<?php echo esc_attr( $option_key ); ?>" <?php selected( $option_key, esc_attr( $this->get_option( $key ) ) ); ?>><?php echo esc_attr( $option_value ); ?></option>
						<?php endforeach; ?>
					</select>
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Multiselect HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_multiselect_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'disabled'          => false,
			'class'             => '',
			'css'               => '',
			'placeholder'       => '',
			'type'              => 'text',
			'desc_tip'          => false,
			'description'       => '',
			'custom_attributes' => array(),
			'options'           => array()
		);

		$data  = wp_parse_args( $data, $defaults );
		$value = (array) $this->get_option( $key, array() );

		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc">
				<label for="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></label>
				<?php echo $this->get_tooltip_html( $data ); ?>
			</th>
			<td class="forminp">
				<fieldset>
					<legend class="screen-reader-text"><span><?php echo wp_kses_post( $data['title'] ); ?></span></legend>
					<select multiple="multiple" class="multiselect <?php echo esc_attr( $data['class'] ); ?>" name="<?php echo esc_attr( $field ); ?>[]" id="<?php echo esc_attr( $field ); ?>" style="<?php echo esc_attr( $data['css'] ); ?>" <?php disabled( $data['disabled'], true ); ?> <?php echo $this->get_custom_attribute_html( $data ); ?>>
						<?php foreach ( (array) $data['options'] as $option_key => $option_value ) : ?>
							<option value="<?php echo esc_attr( $option_key ); ?>" <?php selected( in_array( $option_key, $value ), true ); ?>><?php echo esc_attr( $option_value ); ?></option>
						<?php endforeach; ?>
					</select>
					<?php echo $this->get_description_html( $data ); ?>
				</fieldset>
			</td>
		</tr>
		<?php

		return ob_get_clean();
	}

	/**
	 * Generate Title HTML.
	 *
	 * @param  mixed $key
	 * @param  mixed $data
	 * @since  1.0.0
	 * @return string
	 */
	public function generate_title_html( $key, $data ) {

		$field    = $this->get_field_key( $key );
		$defaults = array(
			'title'             => '',
			'class'             => ''
		);

		$data = wp_parse_args( $data, $defaults );

		ob_start();
		?>
			</table>
			<h3 class="wc-settings-sub-title <?php echo esc_attr( $data['class'] ); ?>" id="<?php echo esc_attr( $field ); ?>"><?php echo wp_kses_post( $data['title'] ); ?></h3>
			<?php if ( ! empty( $data['description'] ) ) : ?>
				<p><?php echo wp_kses_post( $data['description'] ); ?></p>
			<?php endif; ?>
			<table class="form-table">
		<?php

		return ob_get_clean();
	}

	/**
	 * Validate Settings Field Data.
	 *
	 * Validate the data on the "Settings" form.
	 *
	 * @since 1.0.0
	 * @uses  method_exists()
	 * @param array $form_fields (default: array())
	 */
	public function validate_settings_fields( $form_fields = array() ) {

		if ( empty( $form_fields ) ) {
			$form_fields = $this->get_form_fields();
		}

		$this->sanitized_fields = array();

		foreach ( $form_fields as $k => $v ) {

			if ( empty( $v['type'] ) ) {
				$v['type'] = 'text'; // Default to "text" field type.
			}

			// Look for a validate_FIELDID_field method for special handling
			if ( method_exists( $this, 'validate_' . $k . '_field' ) ) {
				$field = $this->{'validate_' . $k . '_field'}( $k );
				$this->sanitized_fields[ $k ] = $field;

			// Look for a validate_FIELDTYPE_field method
			} elseif ( method_exists( $this, 'validate_' . $v['type'] . '_field' ) ) {
				$field = $this->{'validate_' . $v['type'] . '_field'}( $k );
				$this->sanitized_fields[ $k ] = $field;

			// Default to text
			} else {
				$field = $this->{'validate_text_field'}( $k );
				$this->sanitized_fields[ $k ] = $field;
			}
		}
	}

	/**
	 * Validate Text Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @return string
	 */
	public function validate_text_field( $key ) {

		$text  = $this->get_option( $key );
		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {
			$text = wp_kses_post( trim( stripslashes( $_POST[ $field ] ) ) );
		}

		return $text;
	}

	/**
	 * Validate Price Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @return string
	 */
	public function validate_price_field( $key ) {

		$text  = $this->get_option( $key );
		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {

			if ( $_POST[ $field ] !== '' ) {
				$text = wc_format_decimal( trim( stripslashes( $_POST[ $field ] ) ) );
			} else {
				$text = '';
			}
		}

		return $text;
	}

	/**
	 * Validate Decimal Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @return string
	 */
	public function validate_decimal_field( $key ) {

		$text  = $this->get_option( $key );
		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {

			if ( $_POST[ $field ] !== '' ) {
				$text = wc_format_decimal( trim( stripslashes( $_POST[ $field ] ) ) );
			} else {
				$text = '';
			}
		}

		return $text;
	}

	/**
	 * Validate Password Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @since  1.0.0
	 * @return string
	 */
	public function validate_password_field( $key ) {

		$text  = $this->get_option( $key );
		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {
			$text = wc_clean( stripslashes( $_POST[ $field ] ) );
		}

		return $text;
	}

	/**
	 * Validate Textarea Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @since  1.0.0
	 * @return string
	 */
	public function validate_textarea_field( $key ) {

		$text  = $this->get_option( $key );
		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {

			$text = wp_kses( trim( stripslashes( $_POST[ $field ] ) ),
				array_merge(
					array(
						'iframe' => array( 'src' => true, 'style' => true, 'id' => true, 'class' => true )
					),
					wp_kses_allowed_html( 'post' )
				)
			);
		}

		return $text;
	}

	/**
	 * Validate Checkbox Field.
	 *
	 * If not set, return "no", otherwise return "yes".
	 *
	 * @param  mixed $key
	 * @since  1.0.0
	 * @return string
	 */
	public function validate_checkbox_field( $key ) {

		$status = 'no';
		$field  = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) && ( 1 == $_POST[ $field ] ) ) {
			$status = 'yes';
		}

		return $status;
	}

	/**
	 * Validate Select Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @since  1.0.0
	 * @return string
	 */
	public function validate_select_field( $key ) {

		$value = $this->get_option( $key );
		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {
			$value = wc_clean( stripslashes( $_POST[ $field ] ) );
		}

		return $value;
	}

	/**
	 * Validate Multiselect Field.
	 *
	 * Make sure the data is escaped correctly, etc.
	 *
	 * @param  mixed $key
	 * @since  1.0.0
	 * @return string
	 */
	public function validate_multiselect_field( $key ) {

		$field = $this->get_field_key( $key );

		if ( isset( $_POST[ $field ] ) ) {
			$value = array_map( 'wc_clean', array_map( 'stripslashes', (array) $_POST[ $field ] ) );
		} else {
			$value = '';
		}

		return $value;
	}
}