Image Uploader using node.js

· by · in JavaScript, Web Development. ·

Also found here: https://github.com/justinkjchang/imgUploader-nodejs

Image Uploader written using node.js platform.

index.js

var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");

var handle = {}
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
handle["/show"] = requestHandlers.show;

server.start(router.route, handle);

server.js

var http = require("http");
var url = require("url");

function start(route, handle){
	function onRequest(request, response){
		var pathname = url.parse(request.url).pathname;
		console.log("Request for " + pathname + " received.");

		route(handle, pathname, response, request);
	}
	
	http.createServer(onRequest).listen(8888);
	console.log("Server has been initialized");
}

exports.start = start;

router.js

function route(handle, pathname, response, request){
	console.log("About to route request for " + pathname);

	if(typeof handle[pathname] === 'function'){
		handle[pathname](response, request);
	} else {
		console.log("No request handler found for " + pathname);
		response.writeHead(404, {"Content-Type": "text/plain"});
		response.write("404 Not found");
		response.end();
	}
}

exports.route = route;

requestHandlers.js

var querystring = require("querystring"),
    fs = require("fs"),
    formidable = require("formidable");

function start(response) {
    console.log("Request handler 'start' was called.");
    var body = '<html>' +
        '<head>' +
        '<meta http-equiv="Content-Type" ' +
        'content="text/html; charset=UTF-8" />' +
        '</head>' +
        '<body>' +
        '<form action="/upload" enctype="multipart/form-data" ' +
        'method="post">' +
        '<input type="file" name="upload" multiple="multiple">' +
        '<input type="submit" value="Upload file" />' +
        '</form>' +
        '</body>' +
        '</html>';
    response.writeHead(200, {
        "Content-Type": "text/html"
    });
    response.write(body);
    response.end();
}

function upload(response, request) {
    console.log("Request handler 'upload' was called.");
    var form = new formidable.IncomingForm();
    console.log("about to parse");
    form.parse(request, function (error, fields, files) {
        console.log("parsing done");

        // Possible error on Windows systems:
        // trying to rename to an already existing file
        fs.rename(files.upload.path, "/tmp/test.png", function (error) {
            if (error) {
                fs.unlink("/tmp/test.png");
                fs.rename(files.upload.path, "/tmp/test.png");
            }
        });
        response.writeHead(200, {
            "Content-Type": "text/html"
        });
        response.write("received image:<br/>");
        response.write("<img src='/show' />");
        response.end();
    });
}

function show(response) {
    console.log("Request handler 'show' was called.");
    fs.readFile("/tmp/test.png", "binary", function (error, file) {
        if (error) {
            response.writeHead(500, {
                "Content-Type": "text/plain"
            });
            response.write(error + "\n");
            response.end();
        } else {
            response.writeHead(200, {
                "Content-Type": "image/png"
            });
            response.write(file, "binary");
            response.end();
        }
    });
}
exports.start = start;
exports.upload = upload;
exports.show = show;

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