NodeJS - Http Post

NodeJS - Http Post.js

//doHttpPost('localhost', 8000, '/TestPost', 'string' , 'TestTestTestTest', false);
//doHttpPost('localhost', 8000, '/TestPost', 'file' , '/Users/chengwei/Downloads/grid1.png', true);

function doHttpPost(_host, _port, _path, name, value, isFile, fileEncoding) {
	var http = require('http'),
	    fs = require('fs'),
	    path = require('path'),
	    boundary = Math.random(),
	    postData, postOptions, postRequest;

	if (isFile) {
		var fileName = path.basename(value),
		    encoding = fileEncoding?fileEncoding:'binary',
		    dataLength = 0,
		    fileContents = '',
		    fileReader;

		postData = [];
		postData.push(new Buffer(EncodeFilePart(boundary, 'application/octet-stream', name, fileName), 'ascii'));
		fileReader = fs.createReadStream(value, {'encoding': encoding});
		fileReader.on('data', function(data) {
			fileContents += data;
		});
		fileReader.on('end', function() {
			postData.push(new Buffer(fileContents, encoding));
			postData.push(new Buffer("\r\n--" + boundary + "--"), 'ascii');

			// Calculate data length
			for(var i = 0; i < postData.length; i++) {
				dataLength += postData[i].length;
			}

			postOptions = {
				'host': _host,
				'port': _port,
				'path': _path,
				'method': 'POST',
				'headers' : {
					'Content-Type' : 'multipart/form-data; boundary=' + boundary,
					'Content-Length' : dataLength
				}
			};

			postRequest = http.request(postOptions, function(response){
				response.setEncoding('utf8');
				response.on('data', function(chunk) {
					// Respond to http response
					console.log(chunk);
				});
				response.on('end', function() {
					// Respond to http response
					console.log('send ' + value);
				});
			});

			for (var i = 0; i < postData.length; i++) {
				postRequest.write(postData[i]);
			}
			postRequest.end();
		});
	}
	else {
		postData = '';
		postData += EncodeFieldPart(boundary, name, value);
		postData += '--' + boundary + '--';
		postOptions = {
			'host': _host,
			'port': _port,
			'path': _path,
			'method': 'POST',
			'headers' : {
				'Content-Type' : 'multipart/form-data; boundary=' + boundary,
				'Content-Length' : postData.length
			}
		};
		postRequest = http.request(postOptions, function(response){
			response.setEncoding('utf8');
			response.on('data', function(chunk) {
				// Respond to http response
				console.log(chunk);
			});
			response.on('end', function() {
				// Respond to http response
				console.log('send ' + value);
			});
		});
		postRequest.write(postData);
		postRequest.end();
	}

	function EncodeFieldPart(boundary,name,value) {
		var return_part = "--" + boundary + "\r\n";
		return_part += "Content-Disposition: form-data; name=\"" + name + "\"\r\n\r\n";
		return_part += value + "\r\n";
		return return_part;
	}

	function EncodeFilePart(boundary,type,name,filename) {
		var return_part = "--" + boundary + "\r\n";
		return_part += "Content-Disposition: form-data; name=\"" + name + "\"; filename=\"" + filename + "\"\r\n";
		return_part += "Content-Type: " + type + "\r\n\r\n";
		return return_part;
	}
	
}