koa-validate

validate koa request params and format request params

##installation

$ npm install koa-validate

basic usage:

'use strict';
var koa = require('koa');
var app = koa();

app.use(require('koa-body')());
app.use(require('koa-validate')());
app.use(require('koa-router')(app));
app.post('/signup', function * () {
	//optional() means this param may not in the params.
	this.checkBody('name').optional().len(2, 20,"are you kidding me?");
	this.checkBody('email').isEmail("your enter a bad email.");
	this.checkBody('password').notEmpty().len(3, 20).md5();
	//empty() mean this param can be a empty string.
	this.checkBody('nick').optional().empty().len(3, 20);
	this.checkBody('age').toInt();
	yield this.checkFile('icon').notEmpty().size(0,300*1024,'file too large').move("/static/icon/" , function*(file,context){
		//resize image
	});
	if (this.errors) {
		this.body = this.errors;
		return;
	}
	this.body = this.request.body;
});
app.get('/users', function * () {
	this.checkQuery('department').empty().in(["sale","finance"], "not support this department!").len(3, 20);	
	this.checkQuery('name').empty().len(2,20,"bad name.").trim().toLow();
	this.checkQuery('age').empty().gt(10,"too young!").lt(30,"to old!").toInt();
	if (this.errors) {
		this.body = this.errors;
		return;
	}
	this.body = this.query;
});
app.get('/user/:id', function * () {
	this.checkParams('id').toInt(0);
	if (this.errors) {
		this.body = this.errors;
		return;
	}
	this.body = this.params;
});

app.listen(3000);

Api

checkBody,checkQuery,checkParams will return a Validator instance. when use app.use(require('koa-validate')()) ,the request context will bind the method:

• checkBody(fieldName) - check POST body.
• checkQuery(fieldName) - check GET query.
• checkParams(fieldName) - check the params in the urls.
• checkFile(fieldName,[deleteOnCheckFailed]) - check the file object, if you use koa-body.this function will return FileValidator object. deleteOnCheckFailed default value is true

Validator Api

Access validator status:

• addError(tip) - add an error to validator errors.
• hasError() - check if validator has errors.

Validators:

• optional() - the param may not in the params.if the param not exists,it has no error,no matter whether have other checker or not.
• empty([tip]) - the params can be a empty string.
• notEmpty([tip]) - check if the param is no empty.
• match(pattern,[tip]) - pattern must be a RegExp instance ,eg. /abc/i
• isInt([tip]) - check if the param is integer.
• isFloat([tip]) - check if the param is float.
• isLength(min,[max],[tip]) - check the param length.
• len(min,[max],[tip]) - the abbreviation of isLength.
• isIn(arr,[tip]) - check if the param is in the array.
• in(arr,[tip]) - the abbreviation of isIn.
• eq(value,[tip]) - check if the param equal to the value.
• neq(value,[tip]) - check if the param not equal to the value.
• gt(num,[tip]) - check if the param great then the value.
• lt(num,[tip]) - check if the param less then the value.
• ge(num,[tip]) - check if the param great then or equal the value.
• le(num,[tip]) - check if the param less then or equal the value.
• contains(str,[tip]) - check if the param contains the str.
• notContains(str,[tip]) - check if the param not contains the str.
• isEmail([tip]) - check if the param is an email.
• isUrl([tip]) - check if the param is an URL.
• isIp([tip]) - check if the param is an IP (version 4 or 6).
• isAlpha([tip]) - check if the param contains only letters (a-zA-Z).
• isNumeric([tip]) - check if the param contains only numbers.
• isAlphanumeric([tip]) - check if the param contains only letters and numbers.
• isBase64([tip]) - check if a param is base64 encoded.
• isHexadecimal([tip]) - check if the param is a hexadecimal number.
• isHexColor([tip]) - check if the param is a hexadecimal color.
• isLowercase([tip]) - check if the param is lowercase.
• isUppercase([tip]) - check if the param is uppercase.
• isDivisibleBy(num,[tip]) - check if the param is a number that's divisible by another.
• isNull([tip]) - check if the param is null.
• isByteLength(min,max,[tip]) - check if the param's length (in bytes) falls in a range.
• byteLength(min,max,[tip]) - the abbreviation of isByteLength.
• isUUID([tip]) - check if the param is a UUID (version 3, 4 or 5).
• isDate([tip]) - check if the param is a date.
• isAfter(date,[tip]) - check if the param is a date that's after the specified date.
• isBefore(date,[tip]) - check if the param is a date that's before the specified date.
• isCreditCard([tip]) - check if the param is a credit card.
• isISBN([tip]) - check if the param is an ISBN (version 10 or 13).
• isJSON([tip]) - check if the param is valid JSON (note: uses JSON.parse).
• isMultibyte([tip]) - check if the param contains one or more multibyte chars.
• isAscii([tip]) - check if the param contains ASCII chars only.
• isFullWidth([tip]) - check if the param contains any full-width chars.
• isHalfWidth([tip]) - check if the param contains any half-width chars.
• isVariableWidth([tip]) - check if the param contains a mixture of full and half-width chars
• isSurrogatePair([tip]) - check if the param contains any surrogate pairs chars.

Sanitizers:

• default(value) - if the param not exits or is an empty string, it will take the default value.
• toDate() - convert param to js Date object.
• toInt() - convert param to integer.
• toFloat() - convert param to float.
• toLowercase() - convert param to lowercase.
• toLow() - same as toLowercase.
• toUppercase() - convert param to uppercase.
• toUp() - same as toUppercase.
• toBoolean() - convert the param to a boolean. Everything except for '0', 'false' and '' returns true. In strict mode only '1' and 'true' return true.
• toJson() - convert param to json object.
• trim([chars]) - trim characters (whitespace by default) from both sides of the param.
• ltrim([chars]) - trim characters from the left-side of the param.
• rtrim([chars]) - trim characters from the right-side of the param.
• escape() - replace <, >, & and " with HTML entities.
• stripLow() - remove characters with a numerical value < 32 and 127, mostly control characters.
• whitelist(value) - remove characters that do not appear in the whitelist.
• blacklist(value) - remove characters that appear in the blacklist.
• encodeURI() - ref mdn encodeURI
• decodeURI() - ref mdn decodeURI
• encodeURIComponent() - ref mdn encodeURIComponent
• decodeURIComponent() - ref mdn decodeURIComponent
• replace(regexp|substr, newSubStr|function) - the same as String replace
• clone(newKey,[newValue]) - clone current value to the new key, if newValue supplied , use it. eg. this.checkBody('v1').clone('md5').md5(); then your can use this.request.body.md5.
• encodeBase64() - encode current value to base64 string.
• decodeBase64([inBuffer]) - decode current base64 to a normal string,if inBuffer is true , the value will be a Buffer.
• hash(alg , [encoding]) - hash current value use specified algorithm and encoding(if supplied , default is 'hex'). ref hash
• md5() - md5 current value into hex string.
• sha1() - sha1 current value into hex string.

FileValidator:

Validators:

• empty() - current file field can to be a empty file.
• notEmpty([tip]) - current file field can not to be a empty file.
• size(min,max,[tip]) - limit the file size.
• contentTypeMatch(reg,[tip]) - check the file's contentType with regular expression.
• isImageContentType([tip]) - check the file's contentType if is image content type.
• fileNameMatch(reg,[tip]) - check the file's name with regular expression.
• suffixIn(arr,[tip]) - check the suffix of file's if in specified arr. arr eg. ['png','jpg']

Sanitizers:

File sanitizers are generators,we should use yield to execute them. eg. yield this.checkFile('file').notEmpty().copy('/');

• move(target,[afterMove]) - move upload file to the target location. target can be a string or function or function*.if target end with '/' or '\',the target will be deemed as directory. target function interface:string function(fileObject,fieldName,context).this function will return a string of the target file. afterMove:it can be a function or function*.interface:function(fileObject,fieldName,context)
• copy(target,[afterCopy]) - move upload file to the target location. target can be a string or function or function*. target function interface:function (fileObject,fieldName,context) . afterCopy:it can be a function or function*.interface:function(fileObject,fieldName,context)
• delete() - delete upload file.

How to extends validate:

var Validator = require('koa-validate').Validator;
// to do what you want to.
//you can use this.key ,this.value,this.params,this.context,this.exists
//use addError(tip) , if you meet error.