Package validator ================ [![Join the chat at https://gitter.im/bluesuncorp/validator](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bluesuncorp/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Build Status](https://semaphoreci.com/api/v1/projects/ec20115f-ef1b-4c7d-9393-cc76aba74eb4/487374/badge.svg)](https://semaphoreci.com/joeybloggs/validator) [![Coverage Status](https://coveralls.io/repos/bluesuncorp/validator/badge.svg?branch=v6)](https://coveralls.io/r/bluesuncorp/validator?branch=v6) [![GoDoc](https://godoc.org/gopkg.in/bluesuncorp/validator.v6?status.svg)](https://godoc.org/gopkg.in/bluesuncorp/validator.v6) 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. - 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](https://golang.org/src/database/sql/driver/types.go?s=1210:1293#L29) Installation ------------ Use go get. go get gopkg.in/bluesuncorp/validator.v6 or to update go get -u gopkg.in/bluesuncorp/validator.v6 Then import the validator package into your own code. import "gopkg.in/bluesuncorp/validator.v6" Usage and documentation ------ Please see http://godoc.org/gopkg.in/bluesuncorp/validator.v6 for detailed usage docs. ##### Examples: Struct & Field validation ```go 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 ```go package main import ( "errors" "fmt" "reflect" sql "database/sql/driver" "gopkg.in/bluesuncorp/validator.v6" ) var validate *validator.Validate type valuer struct { Name string } func (v valuer) Value() (sql.Value, error) { if v.Name == "errorme" { return nil, errors.New("some kind of error") } if v.Name == "blankme" { return "", nil } if len(v.Name) == 0 { return nil, nil } return v.Name, nil } // ValidateValuerType implements validator.CustomTypeFunc func ValidateValuerType(field reflect.Value) interface{} { if valuer, ok := field.Interface().(sql.Valuer); ok { val, err := valuer.Value() if err != nil { // handle the error how you want return nil } return val } return nil } func main() { customTypes := map[reflect.Type]validator.CustomTypeFunc{} customTypes[reflect.TypeOf((*sql.Valuer)(nil))] = ValidateValuerType customTypes[reflect.TypeOf(valuer{})] = ValidateValuerType config := validator.Config{ TagName: "validate", ValidationFuncs: validator.BakedInValidators, CustomTypeFuncs: customTypes, } validate = validator.New(config) validateCustomFieldType() } func validateCustomFieldType() { val := valuer{ Name: "blankme", } errs := validate.Field(val, "required") if errs != nil { fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "required" tag return } // all ok } ``` Benchmarks ------ ###### Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 NOTE: allocations for structs are up from v5, however ns/op for parallel operations are way down. It was a decicion not to cache struct info because although it reduced allocation to v5 levels, it hurt parallel performance too much. ```go $ go test -cpu=4 -bench=. -benchmem=true PASS BenchmarkFieldSuccess-4 5000000 318 ns/op 16 B/op 1 allocs/op BenchmarkFieldFailure-4 5000000 316 ns/op 16 B/op 1 allocs/op BenchmarkFieldCustomTypeSuccess-4 3000000 492 ns/op 32 B/op 2 allocs/op BenchmarkFieldCustomTypeFailure-4 2000000 843 ns/op 416 B/op 6 allocs/op BenchmarkFieldOrTagSuccess-4 500000 2384 ns/op 20 B/op 2 allocs/op BenchmarkFieldOrTagFailure-4 1000000 1295 ns/op 384 B/op 6 allocs/op BenchmarkStructSimpleSuccess-4 1000000 1175 ns/op 24 B/op 3 allocs/op BenchmarkStructSimpleFailure-4 1000000 1822 ns/op 529 B/op 11 allocs/op BenchmarkStructSimpleCustomTypeSuccess-4 1000000 1302 ns/op 56 B/op 5 allocs/op BenchmarkStructSimpleCustomTypeFailure-4 1000000 1847 ns/op 577 B/op 13 allocs/op BenchmarkStructSimpleSuccessParallel-4 5000000 339 ns/op 24 B/op 3 allocs/op BenchmarkStructSimpleFailureParallel-4 2000000 733 ns/op 529 B/op 11 allocs/op BenchmarkStructComplexSuccess-4 200000 7104 ns/op 368 B/op 30 allocs/op BenchmarkStructComplexFailure-4 100000 11996 ns/op 2861 B/op 72 allocs/op BenchmarkStructComplexSuccessParallel-4 1000000 2252 ns/op 368 B/op 30 allocs/op BenchmarkStructComplexFailureParallel-4 300000 4691 ns/op 2862 B/op 72 allocs/op ``` 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 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. License ------ Distributed under MIT License, please see license file in code for more details.