WP_Filesystem_SSH2::__construct( array $opt = '' )

	public function __construct( $opt = '' ) {
		$this->method = 'ssh2';
		$this->errors = new WP_Error();

		//Check if possible to use ssh2 functions.
		if ( ! extension_loaded('ssh2') ) {
			$this->errors->add('no_ssh2_ext', __('The ssh2 PHP extension is not available'));
			return;
		}
		if ( !function_exists('stream_get_contents') ) {
			$this->errors->add(
				'ssh2_php_requirement',
				sprintf(
					/* translators: %s: stream_get_contents() */
					__( 'The ssh2 PHP extension is available, however, we require the PHP5 function %s' ),
					'<code>stream_get_contents()</code>'
				)
			);
			return;
		}

		// Set defaults:
		if ( empty($opt['port']) )
			$this->options['port'] = 22;
		else
			$this->options['port'] = $opt['port'];

		if ( empty($opt['hostname']) )
			$this->errors->add('empty_hostname', __('SSH2 hostname is required'));
		else
			$this->options['hostname'] = $opt['hostname'];

		// Check if the options provided are OK.
		if ( !empty ($opt['public_key']) && !empty ($opt['private_key']) ) {
			$this->options['public_key'] = $opt['public_key'];
			$this->options['private_key'] = $opt['private_key'];

			$this->options['hostkey'] = array('hostkey' => 'ssh-rsa');

			$this->keys = true;
		} elseif ( empty ($opt['username']) ) {
			$this->errors->add('empty_username', __('SSH2 username is required'));
		}

		if ( !empty($opt['username']) )
			$this->options['username'] = $opt['username'];

		if ( empty ($opt['password']) ) {
			// Password can be blank if we are using keys.
			if ( !$this->keys )
				$this->errors->add('empty_password', __('SSH2 password is required'));
		} else {
			$this->options['password'] = $opt['password'];
		}
	}