API_Action::get_authentication_fields()

	protected function get_authentication_fields() {
		$authenticator = $this->api()->get_authenticator();

		// TODO: Use authentication data to detect what has been set programmatically.
		$authenticator_defaults = $this->api()->get_authentication_data_defaults();

		$title = $this->api()->get_title();

		$fields = array();

		switch ( $authenticator ) {
			case 'oauth1':
				$fields = array(
					'consumer_key'    => array(
						'type'        => 'text',
						'label'       => __( 'API Consumer Key', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the consumer key for the %s API.', 'torro-forms' ), $title ),
					),
					'consumer_secret' => array(
						'type'        => 'text',
						'label'       => __( 'API Consumer Secret', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the consumer secret for the %s API.', 'torro-forms' ), $title ),
					),
				);
				break;
			case 'x':
				if ( empty( $authenticator_defaults['header_name'] ) ) {
					$fields['header_name'] = array(
						'type'        => 'text',
						'label'       => __( 'Authorization Header Name', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the name of the authorization header that is sent to verify %s API requests. It will be prefixed with “X-”.', 'torro-forms' ), $title ),
						'default'     => 'Authorization',
					);
				}
				$fields['token'] = array(
					'type'        => 'text',
					'label'       => __( 'Authorization Token', 'torro-forms' ),
					/* translators: %s: an API title */
					'description' => sprintf( __( 'Enter the authorization token for the %s API.', 'torro-forms' ), $title ),
				);
				break;
			case 'x-account':
				if ( empty( $authenticator_defaults['placeholder_name'] ) ) {
					$fields['placeholder_name'] = array(
						'type'        => 'text',
						'label'       => __( 'Account Placeholder Name', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the name of the placeholder in the URI used to verify %s API requests.', 'torro-forms' ), $title ),
						'default'     => 'account',
					);
				}
				$fields['account'] = array(
					'type'        => 'text',
					'label'       => __( 'Account Identifier', 'torro-forms' ),
					/* translators: %s: an API title */
					'description' => sprintf( __( 'Enter the account identifier for the %s API.', 'torro-forms' ), $title ),
				);
				if ( empty( $authenticator_defaults['header_name'] ) ) {
					$fields['header_name'] = array(
						'type'        => 'text',
						'label'       => __( 'Authorization Header Name', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the name of the authorization header that is sent to verify %s API requests. It will be prefixed with “X-”.', 'torro-forms' ), $title ),
						'default'     => 'Authorization',
					);
				}
				$fields['token'] = array(
					'type'        => 'text',
					'label'       => __( 'Authorization Token', 'torro-forms' ),
					/* translators: %s: an API title */
					'description' => sprintf( __( 'Enter the authorization token for the %s API.', 'torro-forms' ), $title ),
				);
				break;
			case 'basic':
				$fields = array(
					'username' => array(
						'type'        => 'text',
						'label'       => __( 'API Username', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the username for the %s API.', 'torro-forms' ), $title ),
					),
					'password' => array(
						'type'        => 'text',
						'label'       => __( 'API Password', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the password for the %s API.', 'torro-forms' ), $title ),
					),
				);
				break;
			case 'key':
				if ( empty( $authenticator_defaults['parameter_name'] ) ) {
					$fields['parameter_name'] = array(
						'type'        => 'text',
						'label'       => __( 'API Key Parameter Name', 'torro-forms' ),
						/* translators: %s: an API title */
						'description' => sprintf( __( 'Enter the name of the request parameter that is sent to verify %s API requests.', 'torro-forms' ), $title ),
						'default'     => 'key',
					);
				}
				$fields['key'] = array(
					'type'        => 'text',
					'label'       => __( 'API Key', 'torro-forms' ),
					/* translators: %s: an API title */
					'description' => sprintf( __( 'Enter the API key for the %s API.', 'torro-forms' ), $title ),
				);
				break;
		}

		return $fields;
	}