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
Use go get.
go get gopkg.in/bluesuncorp/validator.v7
or to update
go get -u gopkg.in/bluesuncorp/validator.v7
Then import the validator package into your own code.
import "gopkg.in/bluesuncorp/validator.v7"
Please see http://godoc.org/gopkg.in/bluesuncorp/validator.v7 for detailed usage docs.
Struct & Field validation
package main
import (
"fmt"
"gopkg.in/bluesuncorp/validator.v6"
)
// 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",
ValidationFuncs: validator.BakedInValidators,
}
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["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/bluesuncorp/validator.v7"
)
// DbBackedUser User struct
type DbBackedUser struct {
Name sql.NullString `validate:"required"`
Age sql.NullInt64 `validate:"required"`
}
func main() {
config := validator.Config{
TagName: "validate",
ValidationFuncs: validator.BakedInValidators,
}
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) > 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
}Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go 1.5
PASS
BenchmarkFieldSuccess-4 5000000 290 ns/op 16 B/op 1 allocs/op
BenchmarkFieldFailure-4 5000000 286 ns/op 16 B/op 1 allocs/op
BenchmarkFieldDiveSuccess-4 500000 2497 ns/op 384 B/op 19 allocs/op
BenchmarkFieldDiveFailure-4 500000 3022 ns/op 752 B/op 23 allocs/op
BenchmarkFieldCustomTypeSuccess-4 3000000 446 ns/op 32 B/op 2 allocs/op
BenchmarkFieldCustomTypeFailure-4 2000000 778 ns/op 416 B/op 6 allocs/op
BenchmarkFieldOrTagSuccess-4 1000000 1287 ns/op 32 B/op 2 allocs/op
BenchmarkFieldOrTagFailure-4 1000000 1125 ns/op 400 B/op 6 allocs/op
BenchmarkStructSimpleCustomTypeSuccess-4 1000000 1225 ns/op 80 B/op 5 allocs/op
BenchmarkStructSimpleCustomTypeFailure-4 1000000 1742 ns/op 608 B/op 13 allocs/op
BenchmarkStructPartialSuccess-4 1000000 1304 ns/op 400 B/op 11 allocs/op
BenchmarkStructPartialFailure-4 1000000 1818 ns/op 784 B/op 16 allocs/op
BenchmarkStructExceptSuccess-4 2000000 869 ns/op 368 B/op 9 allocs/op
BenchmarkStructExceptFailure-4 1000000 1308 ns/op 400 B/op 11 allocs/op
BenchmarkStructSimpleCrossFieldSuccess-4 2000000 973 ns/op 128 B/op 6 allocs/op
BenchmarkStructSimpleCrossFieldFailure-4 1000000 1519 ns/op 528 B/op 11 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldSuccess-4 1000000 1382 ns/op 160 B/op 8 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldFailure-4 1000000 1931 ns/op 560 B/op 13 allocs/op
BenchmarkStructSimpleSuccess-4 1000000 1132 ns/op 48 B/op 3 allocs/op
BenchmarkStructSimpleFailure-4 1000000 1735 ns/op 560 B/op 11 allocs/op
BenchmarkStructSimpleSuccessParallel-4 3000000 363 ns/op 48 B/op 3 allocs/op
BenchmarkStructSimpleFailureParallel-4 2000000 705 ns/op 560 B/op 11 allocs/op
BenchmarkStructComplexSuccess-4 200000 6935 ns/op 432 B/op 27 allocs/op
BenchmarkStructComplexFailure-4 200000 11059 ns/op 2920 B/op 69 allocs/op
BenchmarkStructComplexSuccessParallel-4 1000000 2220 ns/op 432 B/op 27 allocs/op
BenchmarkStructComplexFailureParallel-4 300000 4739 ns/op 2920 B/op 69 allocs/opThere 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 brach 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.
Distributed under MIT License, please see license file in code for more details.