validator

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 Go to latest Published: Sep 27, 2019 License: MIT, MIT Imports: 13 Imported by: 0

README

Package validator

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Package validator implements value validations for structs and individual fields based on tags.

It has the following unique features:

  • Cross Field and Cross Struct validations by using validation tags or custom validators.
  • Slice, Array and Map diving, which allows any or all levels of a multidimensional field to be validated.
  • Handles type interface by determining it's underlying type prior to validation.
  • Handles custom field types such as sql driver Valuer see Valuer
  • Alias validation tags, which allows for mapping of several validations to a single tag for easier defining of validations on structs
  • Extraction of custom defined Field Name e.g. can specify to extract the JSON name while validating and have it available in the resulting FieldError

Installation

Use go get.

go get gopkg.in/go-playground/validator.v8

or to update

go get -u gopkg.in/go-playground/validator.v8

Then import the validator package into your own code.

import "gopkg.in/go-playground/validator.v8"

Error Return Value

Validation functions return type error

They return type error to avoid the issue discussed in the following, where err is always != nil:

validator only returns nil or ValidationErrors as type error; so in you code all you need to do is check if the error returned is not nil, and if it's not type cast it to type ValidationErrors like so:

err := validate.Struct(mystruct)
validationErrors := err.(validator.ValidationErrors)

Usage and documentation

Please see http://godoc.org/gopkg.in/go-playground/validator.v8 for detailed usage docs.

Examples:

Struct & Field validation

package main

import (
	"fmt"

	"gopkg.in/go-playground/validator.v8"
)

// User contains user information
type User struct {
	FirstName      string     `validate:"required"`
	LastName       string     `validate:"required"`
	Age            uint8      `validate:"gte=0,lte=130"`
	Email          string     `validate:"required,email"`
	FavouriteColor string     `validate:"hexcolor|rgb|rgba"`
	Addresses      []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
}

// Address houses a users address information
type Address struct {
	Street string `validate:"required"`
	City   string `validate:"required"`
	Planet string `validate:"required"`
	Phone  string `validate:"required"`
}

var validate *validator.Validate

func main() {

	config := &validator.Config{TagName: "validate"}

	validate = validator.New(config)

	validateStruct()
	validateField()
}

func validateStruct() {

	address := &Address{
		Street: "Eavesdown Docks",
		Planet: "Persphone",
		Phone:  "none",
	}

	user := &User{
		FirstName:      "Badger",
		LastName:       "Smith",
		Age:            135,
		Email:          "Badger.Smith@gmail.com",
		FavouriteColor: "#000",
		Addresses:      []*Address{address},
	}

	// returns nil or ValidationErrors ( map[string]*FieldError )
	errs := validate.Struct(user)

	if errs != nil {

		fmt.Println(errs) // output: Key: "User.Age" Error:Field validation for "Age" failed on the "lte" tag
		//	                         Key: "User.Addresses[0].City" Error:Field validation for "City" failed on the "required" tag
		err := errs.(validator.ValidationErrors)["User.Addresses[0].City"]
		fmt.Println(err.Field) // output: City
		fmt.Println(err.Tag)   // output: required
		fmt.Println(err.Kind)  // output: string
		fmt.Println(err.Type)  // output: string
		fmt.Println(err.Param) // output:
		fmt.Println(err.Value) // output:

		// from here you can create your own error messages in whatever language you wish
		return
	}

	// save user to database
}

func validateField() {
	myEmail := "joeybloggs.gmail.com"

	errs := validate.Field(myEmail, "required,email")

	if errs != nil {
		fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "email" tag
		return
	}

	// email ok, move on
}

Custom Field Type

package main

import (
	"database/sql"
	"database/sql/driver"
	"fmt"
	"reflect"

	"gopkg.in/go-playground/validator.v8"
)

// DbBackedUser User struct
type DbBackedUser struct {
	Name sql.NullString `validate:"required"`
	Age  sql.NullInt64  `validate:"required"`
}

func main() {

	config := &validator.Config{TagName: "validate"}

	validate := validator.New(config)

	// register all sql.Null* types to use the ValidateValuer CustomTypeFunc
	validate.RegisterCustomTypeFunc(ValidateValuer, sql.NullString{}, sql.NullInt64{}, sql.NullBool{}, sql.NullFloat64{})

	x := DbBackedUser{Name: sql.NullString{String: "", Valid: true}, Age: sql.NullInt64{Int64: 0, Valid: false}}
	errs := validate.Struct(x)

	if len(errs.(validator.ValidationErrors)) > 0 {
		fmt.Printf("Errs:\n%+v\n", errs)
	}
}

// ValidateValuer implements validator.CustomTypeFunc
func ValidateValuer(field reflect.Value) interface{} {
	if valuer, ok := field.Interface().(driver.Valuer); ok {
		val, err := valuer.Value()
		if err == nil {
			return val
		}
		// handle the error how you want
	}
	return nil
}

Struct Level Validation

package main

import (
	"fmt"
	"reflect"

	"gopkg.in/go-playground/validator.v8"
)

// User contains user information
type User struct {
	FirstName      string     `json:"fname"`
	LastName       string     `json:"lname"`
	Age            uint8      `validate:"gte=0,lte=130"`
	Email          string     `validate:"required,email"`
	FavouriteColor string     `validate:"hexcolor|rgb|rgba"`
	Addresses      []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
}

// Address houses a users address information
type Address struct {
	Street string `validate:"required"`
	City   string `validate:"required"`
	Planet string `validate:"required"`
	Phone  string `validate:"required"`
}

var validate *validator.Validate

func main() {

	config := &validator.Config{TagName: "validate"}

	validate = validator.New(config)
	validate.RegisterStructValidation(UserStructLevelValidation, User{})

	validateStruct()
}

// UserStructLevelValidation contains custom struct level validations that don't always
// make sense at the field validation level. For Example this function validates that either
// FirstName or LastName exist; could have done that with a custom field validation but then
// would have had to add it to both fields duplicating the logic + overhead, this way it's
// only validated once.
//
// NOTE: you may ask why wouldn't I just do this outside of validator, because doing this way
// hooks right into validator and you can combine with validation tags and still have a
// common error output format.
func UserStructLevelValidation(v *validator.Validate, structLevel *validator.StructLevel) {

	user := structLevel.CurrentStruct.Interface().(User)

	if len(user.FirstName) == 0 && len(user.LastName) == 0 {
		structLevel.ReportError(reflect.ValueOf(user.FirstName), "FirstName", "fname", "fnameorlname")
		structLevel.ReportError(reflect.ValueOf(user.LastName), "LastName", "lname", "fnameorlname")
	}

	// plus can to more, even with different tag than "fnameorlname"
}

func validateStruct() {

	address := &Address{
		Street: "Eavesdown Docks",
		Planet: "Persphone",
		Phone:  "none",
		City:   "Unknown",
	}

	user := &User{
		FirstName:      "",
		LastName:       "",
		Age:            45,
		Email:          "Badger.Smith@gmail.com",
		FavouriteColor: "#000",
		Addresses:      []*Address{address},
	}

	// returns nil or ValidationErrors ( map[string]*FieldError )
	errs := validate.Struct(user)

	if errs != nil {

		fmt.Println(errs) // output: Key: 'User.LastName' Error:Field validation for 'LastName' failed on the 'fnameorlname' tag
		//	                         Key: 'User.FirstName' Error:Field validation for 'FirstName' failed on the 'fnameorlname' tag
		err := errs.(validator.ValidationErrors)["User.FirstName"]
		fmt.Println(err.Field) // output: FirstName
		fmt.Println(err.Tag)   // output: fnameorlname
		fmt.Println(err.Kind)  // output: string
		fmt.Println(err.Type)  // output: string
		fmt.Println(err.Param) // output:
		fmt.Println(err.Value) // output:

		// from here you can create your own error messages in whatever language you wish
		return
	}

	// save user to database
}

Benchmarks

Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go version go1.5.3 darwin/amd64
PASS
BenchmarkFieldSuccess-8                            	20000000	       118 ns/op	       0 B/op	       0 allocs/op
BenchmarkFieldFailure-8                            	 2000000	       758 ns/op	     432 B/op	       4 allocs/op
BenchmarkFieldDiveSuccess-8                        	  500000	      2471 ns/op	     464 B/op	      28 allocs/op
BenchmarkFieldDiveFailure-8                        	  500000	      3172 ns/op	     896 B/op	      32 allocs/op
BenchmarkFieldCustomTypeSuccess-8                  	 5000000	       300 ns/op	      32 B/op	       2 allocs/op
BenchmarkFieldCustomTypeFailure-8                  	 2000000	       775 ns/op	     432 B/op	       4 allocs/op
BenchmarkFieldOrTagSuccess-8                       	 1000000	      1122 ns/op	       4 B/op	       1 allocs/op
BenchmarkFieldOrTagFailure-8                       	 1000000	      1167 ns/op	     448 B/op	       6 allocs/op
BenchmarkStructLevelValidationSuccess-8            	 3000000	       548 ns/op	     160 B/op	       5 allocs/op
BenchmarkStructLevelValidationFailure-8            	 3000000	       558 ns/op	     160 B/op	       5 allocs/op
BenchmarkStructSimpleCustomTypeSuccess-8           	 2000000	       623 ns/op	      36 B/op	       3 allocs/op
BenchmarkStructSimpleCustomTypeFailure-8           	 1000000	      1381 ns/op	     640 B/op	       9 allocs/op
BenchmarkStructPartialSuccess-8                    	 1000000	      1036 ns/op	     272 B/op	       9 allocs/op
BenchmarkStructPartialFailure-8                    	 1000000	      1734 ns/op	     730 B/op	      14 allocs/op
BenchmarkStructExceptSuccess-8                     	 2000000	       888 ns/op	     250 B/op	       7 allocs/op
BenchmarkStructExceptFailure-8                     	 1000000	      1036 ns/op	     272 B/op	       9 allocs/op
BenchmarkStructSimpleCrossFieldSuccess-8           	 2000000	       773 ns/op	      80 B/op	       4 allocs/op
BenchmarkStructSimpleCrossFieldFailure-8           	 1000000	      1487 ns/op	     536 B/op	       9 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldSuccess-8	 1000000	      1261 ns/op	     112 B/op	       7 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldFailure-8	 1000000	      2055 ns/op	     576 B/op	      12 allocs/op
BenchmarkStructSimpleSuccess-8                     	 3000000	       519 ns/op	       4 B/op	       1 allocs/op
BenchmarkStructSimpleFailure-8                     	 1000000	      1429 ns/op	     640 B/op	       9 allocs/op
BenchmarkStructSimpleSuccessParallel-8             	10000000	       146 ns/op	       4 B/op	       1 allocs/op
BenchmarkStructSimpleFailureParallel-8             	 2000000	       551 ns/op	     640 B/op	       9 allocs/op
BenchmarkStructComplexSuccess-8                    	  500000	      3269 ns/op	     244 B/op	      15 allocs/op
BenchmarkStructComplexFailure-8                    	  200000	      8436 ns/op	    3609 B/op	      60 allocs/op
BenchmarkStructComplexSuccessParallel-8            	 1000000	      1024 ns/op	     244 B/op	      15 allocs/op
BenchmarkStructComplexFailureParallel-8            	  500000	      3536 ns/op	    3609 B/op	      60 allocs/op

Complimentary Software

Here is a list of software that compliments using this library either pre or post validation.

  • form - Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support.
  • Conform - Trims, sanitizes & scrubs data based on struct tags.

How to Contribute

There will always be a development branch for each version i.e. v1-development. In order to contribute, please make your pull requests against those branches.

If the changes being proposed or requested are breaking changes, please create an issue, for discussion or create a pull request against the highest development branch for example this package has a v1 and v1-development branch however, there will also be a v2-development branch even though v2 doesn't exist yet.

I strongly encourage everyone whom creates a custom validation function to contribute them and help make this package even better.

License

Distributed under MIT License, please see license file in code for more details.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Contains 

func Contains(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

Contains is the validation function for validating that the field's value contains the text specified within the param. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func ContainsAny 

func ContainsAny(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

ContainsAny is the validation function for validating that the field's value contains any of the characters specified within the param. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func ContainsRune 

func ContainsRune(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

ContainsRune is the validation function for validating that the field's value contains the rune specified within the param. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func Excludes 

func Excludes(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

Excludes is the validation function for validating that the field's value does not contain the text specified within the param. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func ExcludesAll 

func ExcludesAll(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

ExcludesAll is the validation function for validating that the field's value does not contain any of the characters specified within the param. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func ExcludesRune 

func ExcludesRune(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

ExcludesRune is the validation function for validating that the field's value does not contain the rune specified within the param. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func HasLengthOf 

func HasLengthOf(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

HasLengthOf is the validation function for validating if the current field's value is equal to the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func HasMaxOf 

func HasMaxOf(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

HasMaxOf is the validation function for validating if the current field's value is less than or equal to the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func HasMinOf 

func HasMinOf(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

HasMinOf is the validation function for validating if the current field's value is greater than or equal to the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func HasMultiByteCharacter 

func HasMultiByteCharacter(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

HasMultiByteCharacter is the validation function for validating if the field's value has a multi byte character. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func HasValue 

func HasValue(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

HasValue is the validation function for validating if the current field's value is not the default static value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsASCII 

func IsASCII(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsASCII is the validation function for validating if the field's value is a valid ASCII character. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsAlpha 

func IsAlpha(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsAlpha is the validation function for validating if the current field's value is a valid alpha value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsAlphanum 

func IsAlphanum(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsAlphanum is the validation function for validating if the current field's value is a valid alphanumeric value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsBase64 

func IsBase64(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsBase64 is the validation function for validating if the current field's value is a valid base 64. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsCIDR 

func IsCIDR(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsCIDR is the validation function for validating if the field's value is a valid v4 or v6 CIDR address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsCIDRv4 

func IsCIDRv4(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsCIDRv4 is the validation function for validating if the field's value is a valid v4 CIDR address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsCIDRv6 

func IsCIDRv6(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsCIDRv6 is the validation function for validating if the field's value is a valid v6 CIDR address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsDataURI 

func IsDataURI(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsDataURI is the validation function for validating if the field's value is a valid data URI. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsEmail 

func IsEmail(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsEmail is the validation function for validating if the current field's value is a valid email address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsEq 

func IsEq(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsEq is the validation function for validating if the current field's value is equal to the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsEqCrossStructField 

func IsEqCrossStructField(v *Validate, topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsEqCrossStructField is the validation function for validating that the current field's value is equal to the field, within a separate struct, specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsEqField 

func IsEqField(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsEqField is the validation function for validating if the current field's value is equal to the field specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsGt 

func IsGt(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsGt is the validation function for validating if the current field's value is greater than the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsGtCrossStructField 

func IsGtCrossStructField(v *Validate, topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsGtCrossStructField is the validation function for validating if the current field's value is greater than the field, within a separate struct, specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsGtField 

func IsGtField(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsGtField is the validation function for validating if the current field's value is greater than the field specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsGte 

func IsGte(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsGte is the validation function for validating if the current field's value is greater than or equal to the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsGteCrossStructField 

func IsGteCrossStructField(v *Validate, topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsGteCrossStructField is the validation function for validating if the current field's value is greater than or equal to the field, within a separate struct, specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsGteField 

func IsGteField(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsGteField is the validation function for validating if the current field's value is greater than or equal to the field specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsHEXColor 

func IsHEXColor(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsHEXColor is the validation function for validating if the current field's value is a valid HEX color. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsHSL 

func IsHSL(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsHSL is the validation function for validating if the current field's value is a valid HSL color. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsHSLA 

func IsHSLA(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsHSLA is the validation function for validating if the current field's value is a valid HSLA color. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsHexadecimal 

func IsHexadecimal(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsHexadecimal is the validation function for validating if the current field's value is a valid hexadecimal. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsIP 

func IsIP(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsIP is the validation function for validating if the field's value is a valid v4 or v6 IP address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsIP4AddrResolvable 

func IsIP4AddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsIP4AddrResolvable is the validation function for validating if the field's value is a resolvable ip4 address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsIP6AddrResolvable 

func IsIP6AddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsIP6AddrResolvable is the validation function for validating if the field's value is a resolvable ip6 address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsIPAddrResolvable 

func IsIPAddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsIPAddrResolvable is the validation function for validating if the field's value is a resolvable ip address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsIPv4 

func IsIPv4(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsIPv4 is the validation function for validating if a value is a valid v4 IP address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsIPv6 

func IsIPv6(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsIPv6 is the validation function for validating if the field's value is a valid v6 IP address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsISBN 

func IsISBN(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsISBN is the validation function for validating if the field's value is a valid v10 or v13 ISBN. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsISBN10 

func IsISBN10(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsISBN10 is the validation function for validating if the field's value is a valid v10 ISBN. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsISBN13 

func IsISBN13(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsISBN13 is the validation function for validating if the field's value is a valid v13 ISBN. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLatitude 

func IsLatitude(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLatitude is the validation function for validating if the field's value is a valid latitude coordinate. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLongitude 

func IsLongitude(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLongitude is the validation function for validating if the field's value is a valid longitude coordinate. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLt 

func IsLt(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLt is the validation function for validating if the current field's value is less than the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLtCrossStructField 

func IsLtCrossStructField(v *Validate, topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLtCrossStructField is the validation function for validating if the current field's value is less than the field, within a separate struct, specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLtField 

func IsLtField(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLtField is the validation function for validating if the current field's value is less than the field specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLte 

func IsLte(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLte is the validation function for validating if the current field's value is less than or equal to the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLteCrossStructField 

func IsLteCrossStructField(v *Validate, topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLteCrossStructField is the validation function for validating if the current field's value is less than or equal to the field, within a separate struct, specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsLteField 

func IsLteField(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsLteField is the validation function for validating if the current field's value is less than or equal to the field specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsMAC 

func IsMAC(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsMAC is the validation function for validating if the field's value is a valid MAC address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsNe 

func IsNe(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsNe is the validation function for validating that the field's value does not equal the provided param value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsNeCrossStructField 

func IsNeCrossStructField(v *Validate, topStruct reflect.Value, current reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsNeCrossStructField is the validation function for validating that the current field's value is not equal to the field, within a separate struct, specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsNeField 

func IsNeField(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsNeField is the validation function for validating if the current field's value is not equal to the field specified by the param's value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsNumber 

func IsNumber(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsNumber is the validation function for validating if the current field's value is a valid number. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsNumeric 

func IsNumeric(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsNumeric is the validation function for validating if the current field's value is a valid numeric value. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsPrintableASCII 

func IsPrintableASCII(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsPrintableASCII is the validation function for validating if the field's value is a valid printable ASCII character. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsRGB 

func IsRGB(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsRGB is the validation function for validating if the current field's value is a valid RGB color. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsRGBA 

func IsRGBA(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsRGBA is the validation function for validating if the current field's value is a valid RGBA color. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsSSN 

func IsSSN(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsSSN is the validation function for validating if the field's value is a valid SSN. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsTCP4AddrResolvable 

func IsTCP4AddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsTCP4AddrResolvable is the validation function for validating if the field's value is a resolvable tcp4 address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsTCP6AddrResolvable 

func IsTCP6AddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsTCP6AddrResolvable is the validation function for validating if the field's value is a resolvable tcp6 address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsTCPAddrResolvable 

func IsTCPAddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsTCPAddrResolvable is the validation function for validating if the field's value is a resolvable tcp address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUDP4AddrResolvable 

func IsUDP4AddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUDP4AddrResolvable is the validation function for validating if the field's value is a resolvable udp4 address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUDP6AddrResolvable 

func IsUDP6AddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUDP6AddrResolvable is the validation function for validating if the field's value is a resolvable udp6 address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUDPAddrResolvable 

func IsUDPAddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUDPAddrResolvable is the validation function for validating if the field's value is a resolvable udp address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsURI 

func IsURI(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsURI is the validation function for validating if the current field's value is a valid URI. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsURL 

func IsURL(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsURL is the validation function for validating if the current field's value is a valid URL. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUUID 

func IsUUID(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUUID is the validation function for validating if the field's value is a valid UUID of any version. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUUID3 

func IsUUID3(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUUID3 is the validation function for validating if the field's value is a valid v3 UUID. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUUID4 

func IsUUID4(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUUID4 is the validation function for validating if the field's value is a valid v4 UUID. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUUID5 

func IsUUID5(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUUID5 is the validation function for validating if the field's value is a valid v5 UUID. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

func IsUnixAddrResolvable 

func IsUnixAddrResolvable(v *Validate, topStruct reflect.Value, currentStructOrField reflect.Value, field reflect.Value, fieldType reflect.Type, fieldKind reflect.Kind, param string) bool

IsUnixAddrResolvable is the validation function for validating if the field's value is a resolvable unix address. NOTE: This is exposed for use within your own custom functions and not intended to be called directly.

Types

type Config 

type Config struct {
	TagName      string
	FieldNameTag string
}

Config contains the options that a Validator instance will use. It is passed to the New() function

type CustomTypeFunc 

type CustomTypeFunc func(field reflect.Value) interface{}

CustomTypeFunc allows for overriding or adding custom field type handler functions field = field value of the type to return a value to be validated example Valuer from sql drive see https://golang.org/src/database/sql/driver/types.go?s=1210:1293#L29

type FieldError 

type FieldError struct {
	FieldNamespace string
	NameNamespace  string
	Field          string
	Name           string
	Tag            string
	ActualTag      string
	Kind           reflect.Kind
	Type           reflect.Type
	Param          string
	Value          interface{}
}

FieldError contains a single field's validation error along with other properties that may be needed for error message creation

type Func 

type Func func(v *Validate, topStruct reflect.Value, currentStruct reflect.Value, field reflect.Value, fieldtype reflect.Type, fieldKind reflect.Kind, param string) bool

Func accepts all values needed for file and cross field validation v = validator instance, needed but some built in functions for it's custom types topStruct = top level struct when validating by struct otherwise nil currentStruct = current level struct when validating by struct otherwise optional comparison value field = field value for validation param = parameter used in validation i.e. gt=0 param would be 0

type StructLevel 

type StructLevel struct {
	TopStruct     reflect.Value
	CurrentStruct reflect.Value
	// contains filtered or unexported fields
}

StructLevel contains all of the information and helper methods for reporting errors during struct level validation

func (*StructLevel) ReportError 

func (sl *StructLevel) ReportError(field reflect.Value, fieldName string, customName string, tag string)

ReportError reports an error just by passing the field and tag information NOTE: tag can be an existing validation tag or just something you make up and precess on the flip side it's up to you.

func (*StructLevel) ReportValidationErrors 

func (sl *StructLevel) ReportValidationErrors(relativeKey string, errs ValidationErrors)

ReportValidationErrors accepts the key relative to the top level struct and validatin errors. Example: had a triple nested struct User, ContactInfo, Country and ran errs := validate.Struct(country) from within a User struct level validation would call this method like so: ReportValidationErrors("ContactInfo.", errs) NOTE: relativeKey can contain both the Field Relative and Custom name relative paths i.e. ReportValidationErrors("ContactInfo.|cInfo", errs) where cInfo represents say the JSON name of the relative path; this will be split into 2 variables in the next valiator version.

type StructLevelFunc 

type StructLevelFunc func(v *Validate, structLevel *StructLevel)

StructLevelFunc accepts all values needed for struct level validation

type Validate 

type Validate struct {
	// contains filtered or unexported fields
}

Validate contains the validator settings passed in using the Config struct

func New 

func New(config *Config) *Validate

New creates a new Validate instance for use.

func (*Validate) ExtractType 

func (v *Validate) ExtractType(current reflect.Value) (reflect.Value, reflect.Kind)

ExtractType gets the actual underlying type of field value. It will dive into pointers, customTypes and return you the underlying value and it's kind. it is exposed for use within you Custom Functions

func (*Validate) Field 

func (v *Validate) Field(field interface{}, tag string) error

Field validates a single field using tag style validation and returns nil or ValidationErrors as type error. You will need to assert the error if it's not nil i.e. err.(validator.ValidationErrors) to access the map of errors. NOTE: it returns ValidationErrors instead of a single FieldError because this can also validate Array, Slice and maps fields which may contain more than one error

func (*Validate) FieldWithValue 

func (v *Validate) FieldWithValue(val interface{}, field interface{}, tag string) error

FieldWithValue validates a single field, against another fields value using tag style validation and returns nil or ValidationErrors. You will need to assert the error if it's not nil i.e. err.(validator.ValidationErrors) to access the map of errors. NOTE: it returns ValidationErrors instead of a single FieldError because this can also validate Array, Slice and maps fields which may contain more than one error

func (*Validate) GetStructFieldOK 

func (v *Validate) GetStructFieldOK(current reflect.Value, namespace string) (reflect.Value, reflect.Kind, bool)

GetStructFieldOK traverses a struct to retrieve a specific field denoted by the provided namespace and returns the field, field kind and whether is was successful in retrieving the field at all. NOTE: when not successful ok will be false, this can happen when a nested struct is nil and so the field could not be retrieved because it didn't exist.

func (*Validate) RegisterAliasValidation 

func (v *Validate) RegisterAliasValidation(alias, tags string)

RegisterAliasValidation registers a mapping of a single validationstag that defines a common or complex set of validation(s) to simplify adding validation to structs. NOTE: when returning an error the tag returned in FieldError will be the alias tag unless the dive tag is part of the alias; everything after the dive tag is not reported as the alias tag. Also the ActualTag in the before case will be the actual tag within the alias that failed. NOTE: this method is not thread-safe it is intended that these all be registered prior to any validation

func (*Validate) RegisterCustomTypeFunc 

func (v *Validate) RegisterCustomTypeFunc(fn CustomTypeFunc, types ...interface{})

RegisterCustomTypeFunc registers a CustomTypeFunc against a number of types NOTE: this method is not thread-safe it is intended that these all be registered prior to any validation

func (*Validate) RegisterStructValidation 

func (v *Validate) RegisterStructValidation(fn StructLevelFunc, types ...interface{})

RegisterStructValidation registers a StructLevelFunc against a number of types NOTE: this method is not thread-safe it is intended that these all be registered prior to any validation

func (*Validate) RegisterValidation 

func (v *Validate) RegisterValidation(key string, fn Func) error

RegisterValidation adds a validation Func to a Validate's map of validators denoted by the key NOTE: if the key already exists, the previous validation function will be replaced. NOTE: this method is not thread-safe it is intended that these all be registered prior to any validation

func (*Validate) Struct 

func (v *Validate) Struct(current interface{}) error

Struct validates a structs exposed fields, and automatically validates nested structs, unless otherwise specified. it returns nil or ValidationErrors as error. You will need to assert the error if it's not nil i.e. err.(validator.ValidationErrors) to access the map of errors.

func (*Validate) StructExcept 

func (v *Validate) StructExcept(current interface{}, fields ...string) error

StructExcept validates all fields except the ones passed in. Fields may be provided in a namespaced fashion relative to the struct provided i.e. NestedStruct.Field or NestedArrayField[0].Struct.Name and returns nil or ValidationErrors as error You will need to assert the error if it's not nil i.e. err.(validator.ValidationErrors) to access the map of errors.

func (*Validate) StructPartial 

func (v *Validate) StructPartial(current interface{}, fields ...string) error

StructPartial validates the fields passed in only, ignoring all others. Fields may be provided in a namespaced fashion relative to the struct provided i.e. NestedStruct.Field or NestedArrayField[0].Struct.Name and returns nil or ValidationErrors as error You will need to assert the error if it's not nil i.e. err.(validator.ValidationErrors) to access the map of errors.

type ValidationErrors 

type ValidationErrors map[string]*FieldError

ValidationErrors is a type of map[string]*FieldError it exists to allow for multiple errors to be passed from this library and yet still subscribe to the error interface

func (ValidationErrors) Error 

func (ve ValidationErrors) Error() string

Error is intended for use in development + debugging and not intended to be a production error message. It allows ValidationErrors to subscribe to the Error interface. All information to create an error message specific to your application is contained within the FieldError found within the ValidationErrors map

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