diet-static/index.js

Static file server for diet based on send. A streaming static file server supporting partial responses (Ranges), conditional-GET negotiation, high test coverage, and granular events which may be leveraged to take appropriate actions in your application or

// Dependencies
var url  = require('url');
var path = require('path');
var mime = require('mime');
var fs = require('fs');
var zlib = require('zlib');
var cache = {}
module.exports = function(options){
	return function($){
		var pathname = $.url.pathname;
		var mimeType = mime.lookup(pathname);
		var extension = path.extname(pathname);
		
		// if no route was specified there is an extension and mimeType is not binary
		if(extension){
			// set header
			$.header('Content-Type', mimeType);
			$.status(200);
			var source = options.path + $.url.pathname;
			fs.stat(source, function (error, stats) {
				if(!error){
					$.header('Last-Modified', stats.mtime)
					$.header('Expires', new Date(new Date().getTime() + 604800000).toUTCString())
					$.header('Cache-Control', 'public')
					var modified_since = new Date($.headers['if-modified-since']).getTime();
					var last_modified = new Date(stats.mtime).getTime()
					if(!$.headers['if-modified-since'] || last_modified > modified_since){
						
						// file was modified
						fs.readFile(source, function(readerror, data){
							if(readerror) throw readerror
							
							if(mimeType == 'text/css' || mimeType == 'application/javascript'){	
								var buffer = new Buffer(data);
								zlib.gzip(buffer, function(error, gzip){
									if(error) throw error
									cache[source] = gzip;
									$.header('Content-Encoding', 'gzip')
									$.header('Vary', 'Accept-Encoding')
									$.passed = false;
									$.responded = true;
									$.response.end(gzip)
									$.return()
								})
							} else {
								$.passed = false;
								$.responded = true;
								$.response.end(data)
								$.return()
							}
						})
					
					} else {
						// not modified
						$.status(304)
						$.responded = true;
						$.response.end()
						$.return()
					}
					
				} else if (error.type != 'ENOENT') {
					$.status(error.status || 500, 'File not found');
					$.return();
				} else {
					throw error;
					$.return()
				}
				
			});
		} else {
			$.return();
		}
	}
}