Uploading files via sftp using Gulp

gulpfile.js

var gulp = require("gulp"),
	sftp = require("gulp-sftp"),
	path = require("path"),
	changed = require("gulp-changed"),
	rename = require("gulp-rename"),
	tap = require("gulp-tap"),
	notify = require("gulp-notify"),
	remoteBaseDir = "/base/dir/on/server",
	watchedFilesToUpload = ["css/**/*.css", "js/**/*.js"];

// See gulp-sftp options for the meaning of auth: "privateKeyCustom" or similar.
// https://www.npmjs.org/package/gulp-sftp
function sftpOpts(opts) {
	var defaults = { host: "remote.host.com", auth: "privateKeyCustom", remotePath: "" };
	if (opts) {
		for(var attr in opts) {
			if(opts.hasOwnProperty(attr)) {
				defaults[attr] = opts[attr];
			}
		}
	}
	return defaults;
}

function localPath(str) {
	return __dirname + (str.charAt(0) === "/" ? "" : "/") + str;
}

function upload(event) {
	var path = event.path, remoteFile;
	gulp.src(path)
		.pipe(tap(function (file, t) {
			 remoteFile = file.base.replace(__dirname,remoteBaseDir);
			 gulp.src(file.path)
			 	.pipe(sftp(sftpOpts({ 
			 		remotePath: remoteFile 
		 		})))
		 		.pipe(notify({
		 			onLast: true,
		 			message: "Uploaded " + file.relative + " to " + remoteFile
		 		}));
    }));
};

gulp.task("watch:upload", function() {
	gulp.watch(watchedFilesToUpload, upload);
});