validate.js

'use strict';
var util = require('util'),
fs = require('fs'),
jpath = require('json-path'),
path = require('path');


function getValue(obj, key, transFn){
	if((0 == key.indexOf('/') || 0 == key.indexOf('#/')) && transFn) {
		return jpath.resolve(obj, key)
	}
	return obj[key]
}

function hasKey(obj, key, transFn) {
	if((0 == key.indexOf('/') || 0 == key.indexOf('#/')) && transFn) {
		return (jpath.resolve(obj, key).length > 0) ? true : false
	}
	return key in obj
}

module.exports = function(app) {
	app.context.checkQuery = function(key,transFn) {
		return new Validator(this, key, getValue(this.request.query,key,transFn), hasKey(this.request.query, key, transFn),this.request.query);
	};
	app.context.checkParams = function(key) {
		return new Validator(this, key, this.params[key], key in this.params,this.params);
	};
	app.context.checkHeader = function(key) {
		return new Validator(this, key, this.header[key], key in this.header,this.header);
	};
	app.context.checkBody = function(key,transFn) {
		var body = this.request.body;

		if(!body) {
			if(!this.errors){
				this.errors = ['no body to check!'];
			}
			return new Validator(this, null, null,false, null ,false );
		}
		var body =  body.fields || body;	// koa-body fileds. multipart fields in body.fields
		return new Validator(this, key,getValue(body,key,transFn), hasKey(body, key, transFn), body);
	};
	app.context.checkFile = function(key , deleteOnCheckFailed) {
		if('undefined' == typeof this.request.body || 'undefined' == typeof this.request.body.files ) {
			if(!this.errors){
				this.errors = ['no file to check'];
			}
			return new Validator(this, null, null,false, null,false );
		}
		deleteOnCheckFailed = ('undefined' == typeof deleteOnCheckFailed?true :false);
		var files = this.request.body.files;
		return new FileValidator(this, key ,files&&files[key],!!(files&&files[key]) , this.request.body , deleteOnCheckFailed);
	};
	// return function* (next) {
	// 	yield next;
	// };

};

function isString(s) {
	if(null == s)return false;
	return 'string' == typeof(s)?true:false
}

var v = require('validator');

function Validator(context, key, value, exists, params , goOn) {
	this.params = params;
	this.context = context;
	this.key = key;
	this.value = value;
	this.exists = exists;
	this.goOn = (false===goOn?false:true);
	if(this.value && this instanceof FileValidator && 'goOn' in this.value ){
		this.goOn = this.value.goOn;
	}
}

module.exports.Validator = Validator;
//Validators
Validator.prototype.addError = function(tip) {
	this.goOn = false;
	if(this.value && this instanceof FileValidator ){
		this.value.goOn = false;
	}
	if (!this.context.errors) {
		this.context.errors = [];
	}
	var e = {};
	e[this.key] = tip;
	this.context.errors.push(e);
};

Validator.prototype.hasError = function() {
	return this.context.errors && this.context.errors.length > 0 ? true : false;
};
Validator.prototype.optional = function() {
	if (!this.exists) {
		this.goOn = false;
	}
	return this;
};
Validator.prototype.notEmpty = function(tip) {
	if (this.goOn && (null==this.value||'undefined'==typeof(this.value) || ('string' == typeof(this.value) &&!this.value))) {
		this.addError(tip || this.key + " can not be empty.");
	}
	return this;
};
Validator.prototype.empty = function() {
	if (this.goOn) {
		if (!this.value) {
			this.goOn = false;
		}
	}
	return this;
};
Validator.prototype.notBlank = function(tip) {
	if (this.goOn && (null==this.value||'undefined'==typeof(this.value) || ('string' == typeof(this.value) &&(/^\s*$/gi).test(this.value)))) {
		this.addError(tip || this.key + " can not be blank.");
	}
	return this;
};
Validator.prototype.exist = function(tip) {
	if (this.goOn && !this.exists) {
		 this.addError(tip || this.key +" should exists!");
	}
	return this;
};
Validator.prototype.match = function(reg, tip) {
	if (this.goOn && !reg.test(this.value)) {
		this.addError(tip || this.key + " is bad format.");
	}
	return this;
};

/**
from danneu's proposal [https://github.com/danneu]
*/
// Ensure that a string does not match the supplied regular expression.
Validator.prototype.notMatch = function(reg, tip) {
    if (this.goOn && reg.test(this.value)) {
        this.addError(tip || this.key + ' is bad format.');
    }
    return this;
};
// Ensure that `assertion`, an arbitrary value, is falsey.
Validator.prototype.ensureNot = function(assertion, tip, shouldBail) {
  if (shouldBail) this.goOn = false;
    if (this.goOn && !!assertion) {
        this.addError(tip || this.key + ' failed an assertion.');
    }
    return this;
};
// Ensure that `assertion`, an arbitrary value, is truthy.
Validator.prototype.ensure = function(assertion, tip, shouldBail) {
  if (shouldBail) this.goOn = false;
    if (this.goOn && !assertion) {
        this.addError(tip || this.key + ' failed an assertion.');
    }
    return this;
};

Validator.prototype.isInt = function(tip, options) {
	if (this.goOn&& !v.isInt(String(this.value), options)) {
		this.addError(tip || this.key + " is not integer.");
	}
	return this;
};
Validator.prototype.isFloat = function(tip,options) {
	if (this.goOn && !v.isFloat(String(this.value), options)) {
		this.addError(tip || this.key + " is not float.");
	}
	return this;
};

Validator.prototype.isLength = function(min, max, tip) {
	min = min || 0;
	tip = 'number' != typeof max ? max : tip;
	max = 'number' == typeof max ? max :-1;
	this.exist(tip);
	if (this.goOn) {
		if(this.value.length<min) {
			this.addError(tip || this.key + "'s length must equal or great than " + min+".");
			return this;
		}
		if (-1!=max&&this.value.length>max) {
			this.addError(tip || this.key + "'s length must equal or less than " + max + ".");
			return this;
		}
	}
	return this;
};
Validator.prototype.len = Validator.prototype.isLength;
Validator.prototype.in = function(arr, tip) {
	if (this.goOn && arr) {
		for(var i = 0 ; i < arr.length ;i++){
			if(this.value == arr[i]){
				return this;
			}
		}
		this.addError(tip || this.key + " must be in [" + arr.join(',') + "].");
	}
	return this;
};
Validator.prototype.isIn = Validator.prototype.in;
Validator.prototype.eq = function(l, tip) {
	if (this.goOn && this.value != l) {
		this.addError(tip || this.key + " is must equal " + l + ".");
	}
	return this;
};
Validator.prototype.neq = function(l, tip) {
	if (this.goOn && this.value == l) {
		this.addError(tip || this.key + " is must not equal " + l + ".");
	}
	return this;
};
Validator.prototype.gt = function(l, tip) {
	if (this.goOn && this.value <= l) {
		this.addError(tip || this.key + " must great than " + l + ".");
	}
	return this;
};
Validator.prototype.lt = function(l, tip) {
	if (this.goOn && this.value >= l) {
		this.addError(tip || this.key + " must less than " + l + ".");
	}
	return this;
};
Validator.prototype.ge = function(l, tip) {
	if (this.goOn && this.value < l) {
		this.addError(tip || this.key + " must great than or equal " + l + ".");
	}
	return this;
};
Validator.prototype.le = function(l, tip) {
	if (this.goOn && this.value > l) {
		this.addError(tip || this.key + " must less than or equal " + l + ".");
	}
	return this;
};
Validator.prototype.contains = function(s, tip) {
	if (this.goOn && (!isString(this.value) ||!v.contains(this.value,s))) {
		this.addError(tip || this.key + " is must contain " + s + ".");
	}
	return this;
};
Validator.prototype.notContains = function(s, tip) {
	if (this.goOn && (!isString(this.value) ||v.contains(this.value,s))) {
		this.addError(tip || this.key + " is must not contain " + s + ".");
	}
	return this;
};
Validator.prototype.isEmail = function(tip,options) {
	if (this.goOn && (!isString(this.value) ||!v.isEmail(this.value,options))) {
		this.addError(tip || this.key + " is not email format.");
	}
	return this;
};
Validator.prototype.isUrl = function(tip,options) {
	if (this.goOn && (!isString(this.value) ||!v.isURL(this.value,options))) {
		this.addError(tip || this.key + " is not url format.");
	}
	return this;
};
Validator.prototype.isIp = function(tip,version) {
	if (this.goOn && (!isString(this.value) ||!v.isIP(this.value,version))) {
		this.addError(tip || this.key + " is not ip format.");
	}
	return this;
};
Validator.prototype.isAlpha = function(tip,locale) {
	if (this.goOn && (!isString(this.value) ||!v.isAlpha(this.value,locale))) {
		this.addError(tip || this.key + " is not an alpha string.");
	}
	return this;
};
Validator.prototype.isNumeric = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isNumeric(this.value))) {
		this.addError(tip || this.key + " is  not numeric.");
	}
	return this;
};

Validator.prototype.isAlphanumeric = function(tip,locale) {
	if (this.goOn && (!isString(this.value) ||!v.isAlphanumeric(this.value,locale))) {
		this.addError(tip || this.key + " is not an aphanumeric string.");
	}
	return this;
};
Validator.prototype.isBase64 = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isBase64(this.value))) {
		this.addError(tip || this.key + " is not a base64 string.");
	}
	return this;
};
Validator.prototype.isHexadecimal = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isHexadecimal(this.value))) {
		this.addError(tip || this.key + " is not a hexa decimal string.");
	}
	return this;
};
Validator.prototype.isHexColor = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isHexColor(this.value))) {
		this.addError(tip || this.key + " is  not hex color format.");
	}
	return this;
};
Validator.prototype.isLowercase = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isLowercase(this.value))) {
		this.addError(tip || this.key + " is not a lowwer case string");
	}
	return this;
};
Validator.prototype.isUppercase = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isUppercase(this.value))) {
		this.addError(tip || this.key + " is not a upper case string.");
	}
	return this;
};
Validator.prototype.isDivisibleBy = function(n, tip) {
	if (this.goOn && (!isString(this.value) ||!v.isDivisibleBy(this.value, n))) {
		this.addError(tip || this.key + " can not divide by" + n + ".");
	}
	return this;
};
Validator.prototype.isNull = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isNull(this.value))) {
		this.addError(tip || this.key + " is not null.");
	}
	return this;
};
Validator.prototype.isByteLength = function(min, max,charset,tip) {
	min = min || 0;
	max = max || Number.MAX_VALUE;
	charset = charset||'utf8';
	this.notEmpty(tip);
	if (this.goOn) {
		var bl = Buffer.byteLength(this.value , charset);
		tip = 'number' != typeof max ? max : tip;
		if (bl<min || bl>max) {
			this.addError(tip || this.key + "'s byte lenth great than " + min +" and less than " + max + "." );
		}
	}
	return this;
};
Validator.prototype.byteLength = Validator.prototype.isByteLength;
Validator.prototype.isUUID = function(tip,ver) {
	if (this.goOn && (!isString(this.value) ||!v.isUUID(this.value,ver))) {
		this.addError(tip || this.key + " is not a UUID format.");
	}
	return this;
};
Validator.prototype.isDate = function(tip) {
	if (this.goOn && !util.isDate(this.value)  && (!isString(this.value) ||!v.isDate(this.value))) {
		this.addError(tip || this.key + " is not a date format.");
	}
	return this;
};
Validator.prototype.isTime = function(tip) {
	var timeReg = /^(([0-1]?[0-9])|([2][0-3])):([0-5]?[0-9])(:([0-5]?[0-9]))?$/;
	if(this.goOn && ! timeReg.test(this.value)){
		this.addError(tip || this.key + " is not a time format.");
	}
	return this;
};

Validator.prototype.isAfter = function(d, tip) {
	if (this.goOn && (!isString(this.value) ||!v.isAfter(this.value, d))) {
		this.addError(tip || this.key + " must after " + d + ".");
	}
	return this;
};
Validator.prototype.isBefore = function(d, tip) {
	if (this.goOn && (!isString(this.value) ||!v.isBefore(this.value, d))) {
		this.addError(tip || this.key + " must before " + d + ".");
	}
	return this;
};
Validator.prototype.isCreditCard = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isCreditCard(this.value))) {
		this.addError(tip || this.key + " is not credit card format.");
	}
	return this;
};
Validator.prototype.isISBN = function(tip,version) {
	if (this.goOn && (!isString(this.value) ||!v.isISBN(this.value,version))) {
		this.addError(tip || this.key + " is not a ISBN format.");
	}
	return this;
};
Validator.prototype.isJSON = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isJSON(this.value))) {
		this.addError(tip || this.key + " is not a json format.");
	}
	return this;
};

Validator.prototype.isMultibyte = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isMultibyte(this.value))) {
		this.addError(tip || this.key + " is not a multibyte string.");
	}
	return this;
};
Validator.prototype.isAscii = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isAscii(this.value))) {
		this.addError(tip || this.key + " is not a ascii string.");
	}
	return this;
};
Validator.prototype.isFullWidth = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isFullWidth(this.value))) {
		this.addError(tip || this.key + " is not a full width string.");
	}
	return this;
};
Validator.prototype.isHalfWidth = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isHalfWidth(this.value))) {
		this.addError(tip || this.key + " is not a half width string.");
	}
	return this;
};
Validator.prototype.isVariableWidth = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isVariableWidth(this.value))) {
		this.addError(tip || this.key + " is not a variable width string.");
	}
	return this;
};
Validator.prototype.isSurrogatePair = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isSurrogatePair(this.value))) {
		this.addError(tip || this.key + " is not a surrogate pair string.");
	}
	return this;
};
Validator.prototype.isCurrency = function(tip,options) {
	if (this.goOn && (!isString(this.value) ||!v.isCurrency(this.value,options))) {
		this.addError(tip || this.key + " is not a currency format.");
	}
	return this;
};
Validator.prototype.isDataURI = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isDataURI(this.value))) {
		this.addError(tip || this.key + " is not a data uri format.");
	}
	return this;
};
Validator.prototype.isMobilePhone = function(tip,locale) {
	if (this.goOn && (!isString(this.value) ||!v.isMobilePhone(this.value,locale))) {
		this.addError(tip || this.key + " is not a mobile phone format.");
	}
	return this;
};
Validator.prototype.isISO8601 = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isISO8601(this.value))) {
		this.addError(tip || this.key + " is not a ISO8601 string format.");
	}
	return this;
};
Validator.prototype.isMACAddress = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isMACAddress(this.value))) {
		this.addError(tip || this.key + " is not a MAC address format.");
	}
	return this;
};

Validator.prototype.isISIN = function(tip) {
	if (this.goOn && (!isString(this.value) ||!v.isISIN(this.value))) {
		this.addError(tip || this.key + " is not a ISIN format.");
	}
	return this;
};
Validator.prototype.isFQDN = function(tip,options) {
	if (this.goOn && (!isString(this.value) ||!v.isFQDN(this.value,options))) {
		this.addError(tip || this.key + " is not a fully qualified domain name format.");
	}
	return this;
};


//Sanitizers
Validator.prototype.default = function(d) {
	if(!this.hasError()&&!this.value){
		this.value = this.params[this.key] = d;
	}
	return this;
};
Validator.prototype.toDate = function() {
	this.isDate();
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.toDate(this.value);
	}
	return this;
};
Validator.prototype.toInt = function(tip, radix, options) {
	this.isInt(tip, options);
	if (this.goOn && !this.hasError()) {
		if('number' == typeof(this.value)) {
			return this;
		}
		this.value = this.params[this.key] = v.toInt(this.value, radix);
	}
	return this;
};
Validator.prototype.toFloat = function(tip) {
	this.isFloat(tip);
	if (this.goOn && !this.hasError()) {
		if('number' == typeof(this.value)) {
			return this;
		}
		this.value = this.params[this.key] = v.toFloat(this.value);
	}
	return this;
};
Validator.prototype.toJson = function(tip) {
	if (this.goOn && !this.hasError()) {
		try{
			if('object' == typeof(this.value)) {
				return this;
			}
			this.value = this.params[this.key] = JSON.parse(this.value);
		}catch(e){
			this.addError(tip||'not json format');
		}
	}
	return this;
};
Validator.prototype.toLowercase = function() {
	if (this.goOn && !this.hasError()&&this.value) {
		this.value = this.params[this.key] = this.value.toLowerCase();
	}
	return this;
};
Validator.prototype.toLow = Validator.prototype.toLowercase;
Validator.prototype.toUppercase = function() {
	if (this.goOn && !this.hasError()&&this.value) {
		this.value = this.params[this.key] = this.value.toUpperCase();
	}
	return this;
};
Validator.prototype.toUp = Validator.prototype.toUppercase;
Validator.prototype.toBoolean = function() {
	if (this.goOn && !this.hasError()) {
		if('boolean' == typeof(this.value)) {
			return this;
		}
		if('string' == typeof(this.value)){
			this.value = this.params[this.key] = v.toBoolean(this.value);
		}
	}
	return this;
};
Validator.prototype.trim = function(c) {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.trim(this.value,c);
	}
	return this;
};
Validator.prototype.ltrim = function(c) {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.ltrim(this.value,c);
	}
	return this;
};
Validator.prototype.rtrim = function(c) {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.rtrim(this.value,c);
	}
	return this;
};
Validator.prototype.escape = function() {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.escape(this.value);
	}
	return this;
};
Validator.prototype.stripLow = function(nl) {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.stripLow(this.value, nl);
	}
	return this;
};
Validator.prototype.whitelist = function(s) {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.whitelist(this.value,s);
	}
	return this;
};
Validator.prototype.blacklist = function(s) {
	if (this.goOn && !this.hasError()) {
		this.value = this.params[this.key] = v.blacklist(this.value,s);
	}
	return this;
};
Validator.prototype.encodeURI = function() {
	if (this.goOn && !this.hasError()&&this.value) {
		this.value = this.params[this.key] = encodeURI(this.value);
	}
	return this;
};
Validator.prototype.decodeURI = function(tip) {
	if (this.goOn && !this.hasError()&&this.value) {
		try{
			this.value = this.params[this.key] = decodeURI(this.value);
		}catch(e){
			this.addError(tip||'bad uri to decode.');
		}
	}
	return this;
};
Validator.prototype.encodeURIComponent = function() {
	if (this.goOn && !this.hasError()&&this.value) {
		this.value = this.params[this.key] = encodeURIComponent(this.value);
	}
	return this;
};
Validator.prototype.decodeURIComponent = function(tip) {
	if (this.goOn && !this.hasError()&&this.value) {
		try{
			this.value = this.params[this.key] = decodeURIComponent(this.value);
		}catch(e){
			this.addError(tip||'bad uri to decode.');
		}
	}
	return this;
};
Validator.prototype.replace = function(a,b) {
	if (this.goOn && !this.hasError()&&this.value) {
		this.value = this.params[this.key] = this.value.replace(a,b);
	}
	return this;
};
Validator.prototype.encodeBase64 = function() {
	if (this.goOn && !this.hasError()&&this.value) {
		this.value = this.params[this.key] = new Buffer(this.value).toString('base64');
	}
	return this;
};
Validator.prototype.decodeBase64 = function(inBuffer ,tip) {
	if (!this.hasError()&&this.value) {
		try{
			if(inBuffer){
				this.value = this.params[this.key] = new Buffer(this.value , 'base64');
			}else{
				this.value = this.params[this.key] = new Buffer(this.value , 'base64').toString();
			}
		}catch(e){
			this.addError(tip||"bad base64 format value");
		}
	}
	return this;
};
Validator.prototype.hash = function(alg , enc) {
	if (!this.hasError()&&this.value) {
		enc = enc ||'hex';
		this.value = this.params[this.key] =require('crypto').createHash(alg).update(this.value).digest(enc);
	}
	return this;
};
Validator.prototype.md5 = function() {
	this.hash('md5');
	return this;
};
Validator.prototype.sha1 = function() {
	this.hash('sha1');
	return this;
};
Validator.prototype.clone = function(key , value) {
	if (!this.hasError()&&this.value) {
		this.value = this.params[key] = ('undefined' == typeof value?this.value:value);
		this.key = key;
	}
	return this;
};


// for json path value

Validator.prototype.check = function(fn ,tip, scope) {
	if(this.goOn && !this.hasError()&&!fn.call(scope||this,this.value,this.key,this.context)) {
		this.addError(tip||this.key+" check failed.")
	}
	return this;
}
Validator.prototype.get = function(index) {
	if (this.value) {
		this.value = this.value[index||0]
	}
	return this;
};
Validator.prototype.first = function(index) {
	return this.get(0);
};
Validator.prototype.filter = function(cb,scope) {
	if (this.value&&this.value.length>0) {
		var vs = []
		for(var i = 0 ;i<this.value.length;i++) {
			if(cb.call(scope||this,this.value[i],i,this.key,this.context)){
				vs.push(this.value[i])
			}
		}
		this.value=vs;
	}
	return this;
};

Validator.prototype.type = function(t,tip) {
	if(this.value){
		if('boolean'==t || 'string'==t|| 'number' == t || 'object' == t || 'undefined' ==t){
			if(t!=typeof(this.value)) this.addError(tip|| this.key+" is not "+t+"");
		}else if ('array' == t){
			if(!util.isArray(this.value)) this.addError(tip|| this.key+" is not array");
		}else if ('date' == t){
			if(!util.isDate(this.value)) this.addError(tip|| this.key+" is not date.");
		}else if ('null' == t){
			if(!util.isNull(this.value)) this.addError(tip|| this.key+" is not null.");
		}else if ('nullorundefined' == t.toLowerCase()){
			if(!util.isNullOrUndefined(this.value)) this.addError(tip|| this.key+" is not primitive type.");
		}else if ('primitive' == t){
			if(!util.isPrimitive(this.value)) this.addError(tip|| this.key+" is not primitive type.");
		}else{
			console.warn("not support this type check,type:'"+t+"'")
		}
	}
	return this;
};

function coFsExists(file){
	return function(done){
		fs.exists(file,function(x){
			return done(null , x);
		});
	};
}

function coFsMd(dir){
	return function(done){
		fs.mkdir(dir , done);
	};
}

function coFsIsDir(file){
	return function(done){
		fs.stat(file , function(e,r){
			done(e , r.isDirectory());
		});
	};
}

function coFsCopy(src,dst){
	return function(done){
		var srcStream = fs.createReadStream(src);
		var dstSteam = fs.createWriteStream(dst);

		srcStream.pipe(dstSteam);
		srcStream.on('end', function() {
			done();
		});
		srcStream.on('error', function(e) {
			done(e);
		});
	};
}

function coFsDel(file){
	return function(done){
		fs.unlink(file ,done);
	};
}

function*ensureDir(dir){
	if(!(yield coFsExists(dir))){
		yield ensureDir(path.dirname(dir));
		yield coFsMd(dir);
	}
}

function delFileAsync(path ,cb){
	if(!path){
		if(cb)cb();
		return;
	}
	fs.unlink(path , function(e){
		if(e){
			console.error(e);
		}
		if(cb)cb(e);
	});
}

function isGeneratorFunction(obj) {
  return obj && obj.constructor && 'GeneratorFunction' == obj.constructor.name;
}

function formatSize(size){
	if(size<1024){
		return size+" bytes";
	}else if(size>=1024 && size<1024*1024){
		return (size/1024).toFixed(2)+" kb";
	}else if(size >= 1024*1024 && size<1024*1024*1024){
		return (size/(1024*1024)).toFixed(2)+" mb";
	}else{
		return (size/(1024*1024*1024)).toFixed(2)+" gb";
	}
}

/**
use koa-body ,file object will be {type:"image/jpeg",path:"",name:"",size:"",mtile:""}
*/
function FileValidator(context, key, value, exists, params,deleteOnCheckFailed){
	Validator.call(this,context, key, value, exists, params ,true);
	this.deleteOnCheckFailed = deleteOnCheckFailed;
}
require("util").inherits(FileValidator, Validator);
module.exports.FileValidator = FileValidator;


FileValidator.prototype.notEmpty = function(tip){
	if (this.goOn && (!this.value||this.value.size<=0)) {
		this.addError(tip || "file "+ this.key + " can not be a empty file.");
		if(this.deleteOnCheckFailed){
			delFileAsync(this.value&&this.value.path);
		}
	}
	return this;
};

FileValidator.prototype.size = function(min,max,tip){
	if (this.goOn && (!this.value||this.value.size<min || this.value.size>max)) {
		this.addError(tip || "file "+(this.value && this.value.name||this.key) + "' length must between "+formatSize(min)+" and "+formatSize(max)+".");
		if(this.deleteOnCheckFailed){
			delFileAsync(this.value &&this.value.path);
		}
	}
	return this;
};
FileValidator.prototype.contentTypeMatch = function(reg,tip){
	if (this.goOn && (!this.value || !reg.test(this.value.type))) {
		this.addError(tip || "file "+ (this.value && this.value.name||this.key) + " is bad format.");
		if(this.deleteOnCheckFailed){
			delFileAsync(this.value &&this.value.path);
		}
	}
	return this;
};
FileValidator.prototype.isImageContentType = function(tip){
	if (this.goOn && (!this.value || 0!==this.value.type.indexOf('image/'))) {
		this.addError(tip || "file "+ (this.value && this.value.name||this.key) + " is not a image format.");
		if(this.deleteOnCheckFailed){
			delFileAsync(this.value &&this.value.path);
		}
	}
	return this;
};
FileValidator.prototype.fileNameMatch = function(reg,tip){
	if (this.goOn && (!this.value || !reg.test(this.value.name))) {
		this.addError(tip || "file "+ (this.value && this.value.name||this.key) + " is bad file type.");
		if(this.deleteOnCheckFailed){
			delFileAsync(this.value&&this.value.path);
		}
	}
	return this;
};
FileValidator.prototype.suffixIn = function(arr,tip){
	if (this.goOn && (!this.value || -1==arr.indexOf(-1==this.value.name.lastIndexOf('.')?"":this.value.name.substring(this.value.name.lastIndexOf('.')+1)))) {
		this.addError(tip || "file "+ (this.value && this.value.name||this.key) + " is bad file type.");
		if(this.deleteOnCheckFailed){
			delFileAsync(this.value &&this.value.path);
		}
	}
	return this;
};
FileValidator.prototype.move = function*(dst,afterMove){
	if (this.goOn && this.value ) {
		yield this.copy(dst);
		yield coFsDel(this.value.path);
		if('function' == typeof afterMove){
			if(isGeneratorFunction(afterMove)){
				yield afterMove(this.value,this.key,this.context);
			}else{
				afterMove(this.value,this.key,this.context);
			}
		}
	}
	return this;
};
FileValidator.prototype.copy = function*(dst,afterCopy){
	if (this.goOn && this.value ) {
		var dstFile = dst;
		if('function' == typeof dst){
			if(isGeneratorFunction(dst)){
				dstFile = yield dst(this.value,this.key,this.context);
			}else{
				dstFile = dst(this.value,this.key,this.context);
			}
		}
		if(!(yield coFsExists(this.value.path))){
			this.addError('upload file not exists');
			return;
		}
		if(dstFile.length-1 == dstFile.lastIndexOf('/') ||dstFile.length-1 == dstFile.lastIndexOf('\\')||(yield coFsExists(dstFile)) && (yield coFsIsDir(dstFile))){
			dstFile = path.join(dstFile , path.basename(this.value.path));
		}
		yield ensureDir(path.dirname(dstFile));
		yield coFsCopy(this.value.path,dstFile);
		this.value.newPath = dstFile;
		if('function' == typeof afterCopy){
			if(isGeneratorFunction(afterCopy)){
				yield afterCopy(this.value,this.key,this.context);
			}else{
				afterCopy(this.value,this.key,this.context);
			}
		}
	}
	return this;
};
FileValidator.prototype.delete = function*(){
	if (this.goOn && this.value ) {
		yield coFsDel(this.value.path);
	}
	return this;
};