helpers.js

var Helpers = {};
var fs = require('fs');
var path = require("path");
var touch = require("touch");
var isStream = require("is-stream");
var _ = require("underscore");

var emailTester = /^[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-?\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/;


Helpers.validateEmail = function(email) {
	if(!email) return false;
	if(email.length>254) return false;
	var valid = emailTester.test(email);
	if(!valid) return false;
	var parts = email.split("@");
	if(parts[0].length>64) return false;
	var domainParts = parts[1].split(".");
	if(domainParts.some(function(part) { return part.length>63; }))
		return false;
	return true;
}

Helpers.generateUUID = function () {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    }).toLowerCase();
};

Helpers.getRandomArbitrary = function(min, max) {
    return Math.random() * (max - min) + min;
}


Helpers.buildRankToken = function (accountId) {
    return accountId + '_' + Helpers.generateUUID();
};


Helpers.isValidUrl = function(textval) {
    var urlregex = /^(https?|ftp):\/\/([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){3}|([a-zA-Z0-9-]+\.)*[a-zA-Z0-9-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(:[0-9]+)*(\/($|[a-zA-Z0-9.,?'\\+&%$#=~_-]+))*$/;
    return urlregex.test(textval);
}


Helpers.ensureExistenceOfJSONFilePath = function(path) {
    try {
        touch.sync(path);
        JSON.parse(fs.readFileSync(path));
    } catch (e) {
        fs.unlinkSync(path);
    }
    touch.sync(path);
}


Helpers.resolveDirectoryPath = function (directory) {
    directory = path.resolve(directory);
    if(!fs.statSync(directory).isDirectory())
        throw new Error("Path `"+directory+"` is not directory!");
    return directory;
}

Helpers.fileExists = function (path) {
    try {
        return fs.statSync(path).isFile()
    } catch(e) {
        return false;
    }
}

Helpers.pathToStream = function (streamOrPath) {
    var stream = _.isString(streamOrPath) ? 
        fs.createReadStream(path.resolve(streamOrPath)) : 
        streamOrPath;
    if(!isStream(stream))
        throw new Error("Argument is not posible to convert to stream!");
    return stream;    
}

Helpers.pathToBuffer = function(bufferOrPath){
    return new Promise(function(resolve){
        if(!_.isString(bufferOrPath)){
            return callback(null,bufferOrPath)
        }else{
            fs.readFile(path.resolve(bufferOrPath),callback)
        }

        function callback(err,buffer){
            if(err) throw err;
            if(!Buffer.isBuffer(buffer))
                throw new Error("Argument is not posible to convert to buffer!");
            return resolve(buffer);
        }
    })
}

Helpers.isStream = function (stream) {
    return isStream(stream);   
}

Helpers.dataToRequestOption = function (data, filename) {
    var raw, options = {};
    if(_.isString(filename))
        options.filename = filename;
    if(data instanceof Buffer){
        raw = data;        
    } else if(isStream(data)) {
        raw = data;
    } else if(_.isString(data)) {
        raw = Helpers.pathToStream(data);
    } else if(_.isObject(data)) {
        raw = Helpers.dataToRequestOption(data.value).value;
        options = _.defaults(options, _.omit(data, 'value'));
    } else {
        throw new Error("Invalid data passed as argument for request!")
    }
    return {value: raw, options: options}
}

module.exports = Helpers;