nitpin/lib/response.js

NNTP Client Library

var Blast = __Protoblast,
    Fn = Blast.Bound.Function;

/**
 * The NitpinResponse Class
 *
 * @author   Jelle De Loecker   <jelle@kipdola.be>
 * @since    0.1.0
 * @version  0.1.0
 */
var Response = Fn.inherits('Informer', function NitpinResponse(status, message) {

	// The status of the response
	this.status = status;

	// The message of the initial response
	this.message = message;

	// The buffer of the body
	this.buffer = null;
});

Response.GROUP_SELECTED = 211; // RFC 3977
Response.NO_SUCH_GROUP = 411;  // RFC 3977

/**
 * Create a new NitpinResponse object from an initial chunk
 *
 * @author   Jelle De Loecker   <jelle@kipdola.be>
 * @since    0.1.0
 * @version  0.1.1
 */
Response.setStatic(function createFromChunk(chunk, encoding, command) {

	var endIndex,
	    response,
	    matches,
	    string,
	    len,
	    i;

	for (i = 0; i < chunk.length; i++) {
		if (chunk[i] == 13 && chunk[i+1] == 10) {
			endIndex = i;
			break;
		}
	}

	// Get the first line (the status & message)
	string = chunk.slice(0, endIndex).toString();

	// Store the rest of the buffer
	chunk = chunk.slice(endIndex+2);
	len = chunk.length;

	if (chunk[len-3] == 46 && chunk[len-2] == 13 && chunk[len-1] == 10) {
		// Remove the ".\r\n" from the end of the message
		chunk = chunk.slice(0, -3);
	}

	matches = /^(\d{3}) ([\S\s]+)$/g.exec(string.trim());

	if (!matches) {
		throw new Error('Invalid response given: ' + JSON.stringify(string));
	}

	if (matches[1] < 100 || matches[1] >= 600) {
		throw new Error('Invalid status code given: ' + matches[1]);
	}

	response = new Response(parseInt(matches[1], 10), matches[2]);
	response.buffer = chunk;

	return response;
});

/**
 * Create the lines property on the fly
 *
 * @author   Jelle De Loecker   <jelle@kipdola.be>
 * @since    0.1.0
 * @version  0.1.0
 */
Response.prepareProperty(function lines() {

	if (this.buffer == null) {
		return [];
	}

	// Trim so the trailing "\r\n" is removed
	return this.buffer.toString('binary').trim().split('\r\n');
});

module.exports = Response;