@fibjs/enforce

this library is almost copied from node-enforce (even the document below.)

Data Validations


Enforce

You can create a list of validations for several properties of an Object and then run the checks to
see if everything is OK.

``js
var enforce = require("@fibjs/enforce");
var checks = new enforce.Enforce();

checks
.add("name", enforce.notEmptyString())
.add("age", enforce.ranges.number(18, undefined, "under-age"));

checks.check({
name : "John Doe",
age : 16
}, function (err) {
// err should have an error with "msg" = "under-age"
});
`

You can pass some options in the constructor. One of them is returnAllErrors which makes the validations
be all checked before returning errors. With this option, if any error is found, even if it's only one, it will be
returned in an Array.

`js
var enforce = require("@fibjs/enforce");
var checks = new enforce.Enforce({
returnAllErrors : true
});

checks
.add("name", enforce.notEmptyString())
.add("name", enforce.ranges.length(2)) // yes, you can have multiple validators per property
.add("age", enforce.ranges.number(18, undefined, "under-age"));

checks.check({
name : "J",
age : 16
}, function (err) {
console.log(err);
// [ { [Error: "out-of-range-length"], property: "name", value: "J" },
// { [Error: "under-age"], property: "age", value: 16 }]
});
`

Validators

In fact, all enforcements led to return one Validator, see detail of Validator here.

All validators accept a msg argument at the end. These argument is the error message returned if the
validation fails. All validators return a Validator object that is used by Enforce to support chaining
and other functionality. Validator objects have a validate method which is called by Enforce with the
value of the property in question, a next callback and an optional global context table which may be used to
pass information between validators.

$3

enforce.required([ msg ])

Checks if a property is not null and not undefined. If can be false, 0 or "".

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enforce.notEmptyString([ msg ])

Checks if a property length is not zero. It can actually work with Arrays.

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enforce.sameAs(property, [ msg ])

Checks if a property has the same (strict) value as another one. This is usefull for testing password matching.

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#### Inside a list

enforce.lists.inside(list[, msg ])

Checks if the property is inside a list of items.

#### Outside a list

enforce.lists.outside(list[, msg ])

Checks if the property is not inside a list of items.

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#### In a number range

enforce.ranges.number(min[, max[, msg ]])

Checks if a value is inside a specific range of numbers. Either min or max can be set to undefined meaning
that range side is Infinity.

Please note that this does not check for the type of value passed, you can even use this with Date objects.

#### In a length range

enforce.ranges.length(min[, max[, msg ]])

Does the same as the above but for the length property.

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#### Username

enforce.security.username([[ opts, ]msg ])

Checks if a value matches a username format. opts is also optional and is an object with the following keys:

- length: the minimal length of the username (default = 2)
- expr: the regular expression to be used to match a valid username (if not passed, it's built based on the minimal length)

#### Password

enforce.security.password([[ checks, ]msg ])

Checks if a value has some types of characters and a minimal length. checks has a default string luns6 which means:

- l: lowercase letters
- u: uppercase letters
- n: numbers
- s: special characters
- 6: minimal length of 6

You can of course change this to "lu4" (lowercase, uppercase, minimal length of 4). Please note that if you pass only one argument
to this validator, it will assume it's the msg argument. If you want to change the default checks, you have to pass both arguments.

#### Credit Card

enforce.security.creditcard([[ types, ] msg ])

Checks if a value is a valid credit card number. It supports amex (American Express), visa, maestro, discover and mastercard.
You can change the list of supported cards (types) by passing a list with only some of them. You can also pass luhn which will ignore card
prefixes and lenght and only pass the number using the Luhn algorithm.

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#### Match

enforce.patterns.match(pattern, modifiers[, msg ])

Checks if property passes a specific regular expression. You can pass the pattern as a RegExp object (setting modifiers as null)
or just pass a regular expression and it will be converted.

#### Hex string

enforce.patterns.hexString([ msg ])

Checks if a property matches a predefined RegExp object accepting insensitive hexadecimal characters.

#### E-mail

enforce.patterns.email([ msg ])

Checks if a property matches a predefined RegExp object accepting valid e-mail addresses.

#### IPv4

enforce.patterns.ipv4([ msg ])

Checks if a property matches a predefined RegExp object accepting valid IPv4 address.

#### IPv6

enforce.patterns.ipv6([ msg ])

Checks if a property matches a predefined RegExp object accepting valid IPv6 address.

#### MAC

enforce.patterns.mac([ msg ])

Checks if a property matches a predefined RegExp object accepting valid MAC address.

#### UUID v3

enforce.patterns.uuid3([ msg ])

Checks if a property matches a predefined RegExp object accepting valid UUID version 3.

#### UUID v4

enforce.patterns.uuid4([ msg ])

Checks if a property matches a predefined RegExp object accepting valid UUID version 4.

Chaining

Enforce supports chaining operations on all Validator objects, these allow you to add additional common
conditions to each validation step. All chain operations return Validator objects, allowing you to chain
multiple commands together with ease.

#### ifDefined

validation.ifDefined()

Only proceedes to check the validation if the property's value is not null or undefined, passing validation
if it is.

#### ifNotEmptyString

validation.ifNotEmptyString()

Only proceedes to check the validation if the property's value is a string with a length greater than 0.

#### ifType

validation.ifType(type)

Only proceedes to check the validation if the property's value is of the specified type. Checked with a typeof value == type operation.

#### ifNotType

validation.ifNotType(type)

Only proceedes to check the validation if the property's value is not of the specified type. Checked with a typeof value != type` operation.