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251 lines
9.4 KiB
251 lines
9.4 KiB
Package validator
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================
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[](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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[](https://semaphoreci.com/joeybloggs/validator)
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[](https://coveralls.io/github/go-playground/validator?branch=v8-development)
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[](https://godoc.org/gopkg.in/go-playground/validator.v8)
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Package validator implements value validations for structs and individual fields based on tags.
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It has the following **unique** features:
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- Cross Field and Cross Struct validations by using validation tags or custom validators.
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- Slice, Array and Map diving, which allows any or all levels of a multidimensional field to be validated.
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- Handles type interface by determining it's underlying type prior to validation.
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- Handles custom field types such as sql driver Valuer see [Valuer](https://golang.org/src/database/sql/driver/types.go?s=1210:1293#L29)
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- Alias validation tags, which allows for mapping of several validations to a single tag for easier defining of validations on structs
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Installation
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------------
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Use go get.
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go get gopkg.in/go-playground/validator.v8
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or to update
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go get -u gopkg.in/go-playground/validator.v8
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Then import the validator package into your own code.
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import "gopkg.in/go-playground/validator.v8"
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Error Return Value
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-------
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Validation functions return type error
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They return type error to avoid the issue discussed in the following, where err is always != nil:
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* http://stackoverflow.com/a/29138676/3158232
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* https://github.com/go-playground/validator/issues/134
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validator only returns nil or ValidationErrors as type error; so in you code all you need to do
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is check if the error returned is not nil, and if it's not type cast it to type ValidationErrors
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like so:
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```go
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err := validate.Struct(mystruct)
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validationErrors := err.(validator.ValidationErrors)
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```
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Usage and documentation
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------
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Please see http://godoc.org/gopkg.in/go-playground/validator.v8 for detailed usage docs.
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##### Examples:
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Struct & Field validation
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```go
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package main
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import (
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"fmt"
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"gopkg.in/go-playground/validator.v8"
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)
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// User contains user information
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type User struct {
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FirstName string `validate:"required"`
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LastName string `validate:"required"`
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Age uint8 `validate:"gte=0,lte=130"`
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Email string `validate:"required,email"`
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FavouriteColor string `validate:"hexcolor|rgb|rgba"`
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Addresses []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
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}
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// Address houses a users address information
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type Address struct {
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Street string `validate:"required"`
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City string `validate:"required"`
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Planet string `validate:"required"`
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Phone string `validate:"required"`
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}
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var validate *validator.Validate
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func main() {
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config := &validator.Config{TagName: "validate"}
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validate = validator.New(config)
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validateStruct()
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validateField()
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}
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func validateStruct() {
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address := &Address{
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Street: "Eavesdown Docks",
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Planet: "Persphone",
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Phone: "none",
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}
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user := &User{
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FirstName: "Badger",
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LastName: "Smith",
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Age: 135,
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Email: "Badger.Smith@gmail.com",
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FavouriteColor: "#000",
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Addresses: []*Address{address},
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}
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// returns nil or ValidationErrors ( map[string]*FieldError )
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err := validate.Struct(user)
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if errs != nil {
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fmt.Println(errs) // output: Key: "User.Age" Error:Field validation for "Age" failed on the "lte" tag
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// Key: "User.Addresses[0].City" Error:Field validation for "City" failed on the "required" tag
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err := errs.(validator.ValidationErrors)["User.Addresses[0].City"]
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fmt.Println(err.Field) // output: City
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fmt.Println(err.Tag) // output: required
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fmt.Println(err.Kind) // output: string
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fmt.Println(err.Type) // output: string
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fmt.Println(err.Param) // output:
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fmt.Println(err.Value) // output:
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// from here you can create your own error messages in whatever language you wish
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return
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}
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// save user to database
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}
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func validateField() {
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myEmail := "joeybloggs.gmail.com"
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errs := validate.Field(myEmail, "required,email")
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if errs != nil {
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fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "email" tag
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return
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}
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// email ok, move on
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}
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```
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Custom Field Type
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```go
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package main
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import (
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"database/sql"
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"database/sql/driver"
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"fmt"
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"reflect"
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"gopkg.in/go-playground/validator.v8"
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)
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// DbBackedUser User struct
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type DbBackedUser struct {
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Name sql.NullString `validate:"required"`
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Age sql.NullInt64 `validate:"required"`
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}
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func main() {
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config := &validator.Config{TagName: "validate"}
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validate := validator.New(config)
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// register all sql.Null* types to use the ValidateValuer CustomTypeFunc
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validate.RegisterCustomTypeFunc(ValidateValuer, sql.NullString{}, sql.NullInt64{}, sql.NullBool{}, sql.NullFloat64{})
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x := DbBackedUser{Name: sql.NullString{String: "", Valid: true}, Age: sql.NullInt64{Int64: 0, Valid: false}}
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errs := validate.Struct(x)
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if len(errs.(validator.ValidationErrors)) > 0 {
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fmt.Printf("Errs:\n%+v\n", errs)
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}
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}
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// ValidateValuer implements validator.CustomTypeFunc
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func ValidateValuer(field reflect.Value) interface{} {
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if valuer, ok := field.Interface().(driver.Valuer); ok {
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val, err := valuer.Value()
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if err == nil {
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return val
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}
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// handle the error how you want
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}
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return nil
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}
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```
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Benchmarks
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------
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###### Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go 1.5
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```go
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$ go test -cpu=4 -bench=. -benchmem=true
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PASS
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BenchmarkFieldSuccess-4 5000000 296 ns/op 16 B/op 1 allocs/op
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BenchmarkFieldFailure-4 5000000 294 ns/op 16 B/op 1 allocs/op
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BenchmarkFieldDiveSuccess-4 500000 2529 ns/op 384 B/op 19 allocs/op
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BenchmarkFieldDiveFailure-4 500000 3056 ns/op 768 B/op 23 allocs/op
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BenchmarkFieldCustomTypeSuccess-4 3000000 443 ns/op 32 B/op 2 allocs/op
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BenchmarkFieldCustomTypeFailure-4 2000000 753 ns/op 384 B/op 4 allocs/op
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BenchmarkFieldOrTagSuccess-4 1000000 1334 ns/op 32 B/op 2 allocs/op
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BenchmarkFieldOrTagFailure-4 1000000 1172 ns/op 416 B/op 6 allocs/op
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BenchmarkStructSimpleCustomTypeSuccess-4 1000000 1206 ns/op 80 B/op 5 allocs/op
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BenchmarkStructSimpleCustomTypeFailure-4 1000000 1737 ns/op 592 B/op 11 allocs/op
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BenchmarkStructPartialSuccess-4 1000000 1367 ns/op 400 B/op 11 allocs/op
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BenchmarkStructPartialFailure-4 1000000 1914 ns/op 800 B/op 16 allocs/op
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BenchmarkStructExceptSuccess-4 2000000 909 ns/op 368 B/op 9 allocs/op
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BenchmarkStructExceptFailure-4 1000000 1350 ns/op 400 B/op 11 allocs/op
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BenchmarkStructSimpleCrossFieldSuccess-4 1000000 1218 ns/op 128 B/op 6 allocs/op
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BenchmarkStructSimpleCrossFieldFailure-4 1000000 1783 ns/op 544 B/op 11 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccess-4 1000000 1806 ns/op 160 B/op 8 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldFailure-4 1000000 2369 ns/op 576 B/op 13 allocs/op
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BenchmarkStructSimpleSuccess-4 1000000 1161 ns/op 48 B/op 3 allocs/op
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BenchmarkStructSimpleFailure-4 1000000 1813 ns/op 592 B/op 11 allocs/op
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BenchmarkStructSimpleSuccessParallel-4 5000000 353 ns/op 48 B/op 3 allocs/op
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BenchmarkStructSimpleFailureParallel-4 2000000 656 ns/op 592 B/op 11 allocs/op
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BenchmarkStructComplexSuccess-4 200000 7637 ns/op 432 B/op 27 allocs/op
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BenchmarkStructComplexFailure-4 100000 12775 ns/op 3128 B/op 69 allocs/op
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BenchmarkStructComplexSuccessParallel-4 1000000 2270 ns/op 432 B/op 27 allocs/op
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BenchmarkStructComplexFailureParallel-4 300000 4328 ns/op 3128 B/op 69 allocs/op
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```
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How to Contribute
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------
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There will always be a development branch for each version i.e. `v1-development`. In order to contribute,
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please make your pull requests against those branches.
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If the changes being proposed or requested are breaking changes, please create an issue, for discussion
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or create a pull request against the highest development branch for example this package has a
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v1 and v1-development branch however, there will also be a v2-development branch even though v2 doesn't exist yet.
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I strongly encourage everyone whom creates a custom validation function to contribute them and
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help make this package even better.
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License
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------
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Distributed under MIT License, please see license file in code for more details.
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