You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
404 lines
16 KiB
404 lines
16 KiB
Package validator
|
|
================
|
|
<img align="right" src="https://raw.githubusercontent.com/go-playground/validator/v9/logo.png">
|
|
[](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
|
|
|
[](https://semaphoreci.com/joeybloggs/validator)
|
|
[](https://coveralls.io/github/go-playground/validator?branch=v9)
|
|
[](https://goreportcard.com/report/github.com/go-playground/validator)
|
|
[](https://godoc.org/gopkg.in/go-playground/validator.v9)
|
|
|
|
|
|
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](https://golang.org/src/database/sql/driver/types.go?s=1210:1293#L29)
|
|
- 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.v9
|
|
|
|
or to update
|
|
|
|
go get -u gopkg.in/go-playground/validator.v9
|
|
|
|
Then import the validator package into your own code.
|
|
|
|
import "gopkg.in/go-playground/validator.v9"
|
|
|
|
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:
|
|
|
|
* http://stackoverflow.com/a/29138676/3158232
|
|
* https://github.com/go-playground/validator/issues/134
|
|
|
|
Validator only InvalidValidationError for bad validation input, nil or ValidationErrors as type error; so, in your code all you need to do is check if the error returned is not nil, and if it's not check if error is InvalidValidationError ( if necessary, most of the time it isn't ) type cast it to type ValidationErrors like so:
|
|
|
|
```go
|
|
err := validate.Struct(mystruct)
|
|
validationErrors := err.(validator.ValidationErrors)
|
|
```
|
|
|
|
Usage and documentation
|
|
------
|
|
|
|
Please see http://godoc.org/gopkg.in/go-playground/validator.v9 for detailed usage docs.
|
|
|
|
##### Examples:
|
|
|
|
Struct & Field validation
|
|
```go
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"gopkg.in/go-playground/validator.v9"
|
|
)
|
|
|
|
// 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:"iscolor"` // alias for 'hexcolor|rgb|rgba|hsl|hsla'
|
|
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"`
|
|
}
|
|
|
|
// use a single instance of Validate, it caches struct info
|
|
var validate *validator.Validate
|
|
|
|
func main() {
|
|
|
|
validate = validator.New()
|
|
|
|
validateStruct()
|
|
validateVariable()
|
|
}
|
|
|
|
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 )
|
|
err := validate.Struct(user)
|
|
if err != nil {
|
|
|
|
// this check is only needed when your code could produce
|
|
// an invalid value for validation such as interface with nil
|
|
// value most including myself do not usually have code like this.
|
|
if _, ok := err.(*validator.InvalidValidationError); ok {
|
|
fmt.Println(err)
|
|
return
|
|
}
|
|
|
|
for _, err := range err.(validator.ValidationErrors) {
|
|
|
|
fmt.Println(err.Namespace())
|
|
fmt.Println(err.Field())
|
|
fmt.Println(err.StructNamespace()) // can differ when a custom TagNameFunc is registered or
|
|
fmt.Println(err.StructField()) // by passing alt name to ReportError like below
|
|
fmt.Println(err.Tag())
|
|
fmt.Println(err.ActualTag())
|
|
fmt.Println(err.Kind())
|
|
fmt.Println(err.Type())
|
|
fmt.Println(err.Value())
|
|
fmt.Println(err.Param())
|
|
fmt.Println()
|
|
}
|
|
|
|
// from here you can create your own error messages in whatever language you wish
|
|
return
|
|
}
|
|
|
|
// save user to database
|
|
}
|
|
|
|
func validateVariable() {
|
|
|
|
myEmail := "joeybloggs.gmail.com"
|
|
|
|
errs := validate.Var(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 (
|
|
"database/sql"
|
|
"database/sql/driver"
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"gopkg.in/go-playground/validator.v9"
|
|
)
|
|
|
|
// DbBackedUser User struct
|
|
type DbBackedUser struct {
|
|
Name sql.NullString `validate:"required"`
|
|
Age sql.NullInt64 `validate:"required"`
|
|
}
|
|
|
|
// use a single instance of Validate, it caches struct info
|
|
var validate *validator.Validate
|
|
|
|
func main() {
|
|
|
|
validate = validator.New()
|
|
|
|
// register all sql.Null* types to use the ValidateValuer CustomTypeFunc
|
|
validate.RegisterCustomTypeFunc(ValidateValuer, sql.NullString{}, sql.NullInt64{}, sql.NullBool{}, sql.NullFloat64{})
|
|
|
|
// build object for validation
|
|
x := DbBackedUser{Name: sql.NullString{String: "", Valid: true}, Age: sql.NullInt64{Int64: 0, Valid: false}}
|
|
|
|
err := validate.Struct(x)
|
|
|
|
if err != nil {
|
|
fmt.Printf("Err(s):\n%+v\n", err)
|
|
}
|
|
}
|
|
|
|
// 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
|
|
```go
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"gopkg.in/go-playground/validator.v9"
|
|
)
|
|
|
|
// 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"`
|
|
}
|
|
|
|
// use a single instance of Validate, it caches struct info
|
|
var validate *validator.Validate
|
|
|
|
func main() {
|
|
|
|
validate = validator.New()
|
|
|
|
// register validation for 'User'
|
|
// NOTE: only have to register a non-pointer type for 'User', validator
|
|
// interanlly dereferences during it's type checks.
|
|
validate.RegisterStructValidation(UserStructLevelValidation, User{})
|
|
|
|
// build 'User' info, normally posted data etc...
|
|
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 InvalidValidationError for bad validation input, nil or ValidationErrors ( []FieldError )
|
|
err := validate.Struct(user)
|
|
if err != nil {
|
|
|
|
// this check is only needed when your code could produce
|
|
// an invalid value for validation such as interface with nil
|
|
// value most including myself do not usually have code like this.
|
|
if _, ok := err.(*validator.InvalidValidationError); ok {
|
|
fmt.Println(err)
|
|
return
|
|
}
|
|
|
|
for _, err := range err.(validator.ValidationErrors) {
|
|
|
|
fmt.Println(err.Namespace())
|
|
fmt.Println(err.Field())
|
|
fmt.Println(err.StructNamespace()) // can differ when a custom TagNameFunc is registered or
|
|
fmt.Println(err.StructField()) // by passing alt name to ReportError like below
|
|
fmt.Println(err.Tag())
|
|
fmt.Println(err.ActualTag())
|
|
fmt.Println(err.Kind())
|
|
fmt.Println(err.Type())
|
|
fmt.Println(err.Value())
|
|
fmt.Println(err.Param())
|
|
fmt.Println()
|
|
}
|
|
|
|
// from here you can create your own error messages in whatever language you wish
|
|
return
|
|
}
|
|
|
|
// save user to database
|
|
}
|
|
|
|
// 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(sl validator.StructLevel) {
|
|
|
|
user := sl.Current().Interface().(User)
|
|
|
|
if len(user.FirstName) == 0 && len(user.LastName) == 0 {
|
|
sl.ReportError(user.FirstName, "FirstName", "fname", "fnameorlname", "")
|
|
sl.ReportError(user.LastName, "LastName", "lname", "fnameorlname", "")
|
|
}
|
|
|
|
// plus can to more, even with different tag than "fnameorlname"
|
|
}
|
|
```
|
|
|
|
Benchmarks
|
|
------
|
|
###### Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go version go1.6.3 darwin/amd64
|
|
```go
|
|
BenchmarkFieldSuccess-8 10000000 147 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkFieldSuccessParallel-8 30000000 42.5 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkFieldFailure-8 3000000 417 ns/op 192 B/op 4 allocs/op
|
|
BenchmarkFieldFailureParallel-8 10000000 140 ns/op 192 B/op 4 allocs/op
|
|
BenchmarkFieldDiveSuccess-8 2000000 876 ns/op 201 B/op 11 allocs/op
|
|
BenchmarkFieldDiveSuccessParallel-8 5000000 277 ns/op 201 B/op 11 allocs/op
|
|
BenchmarkFieldDiveFailure-8 1000000 1185 ns/op 396 B/op 16 allocs/op
|
|
BenchmarkFieldDiveFailureParallel-8 3000000 402 ns/op 397 B/op 16 allocs/op
|
|
BenchmarkFieldCustomTypeSuccess-8 5000000 321 ns/op 32 B/op 2 allocs/op
|
|
BenchmarkFieldCustomTypeSuccessParallel-8 20000000 104 ns/op 32 B/op 2 allocs/op
|
|
BenchmarkFieldCustomTypeFailure-8 3000000 416 ns/op 192 B/op 4 allocs/op
|
|
BenchmarkFieldCustomTypeFailureParallel-8 10000000 150 ns/op 192 B/op 4 allocs/op
|
|
BenchmarkFieldOrTagSuccess-8 1000000 1119 ns/op 16 B/op 1 allocs/op
|
|
BenchmarkFieldOrTagSuccessParallel-8 3000000 462 ns/op 16 B/op 1 allocs/op
|
|
BenchmarkFieldOrTagFailure-8 2000000 715 ns/op 208 B/op 5 allocs/op
|
|
BenchmarkFieldOrTagFailureParallel-8 3000000 436 ns/op 208 B/op 5 allocs/op
|
|
BenchmarkStructLevelValidationSuccess-8 3000000 399 ns/op 32 B/op 2 allocs/op
|
|
BenchmarkStructLevelValidationSuccessParallel-8 20000000 140 ns/op 32 B/op 2 allocs/op
|
|
BenchmarkStructLevelValidationFailure-8 2000000 749 ns/op 288 B/op 8 allocs/op
|
|
BenchmarkStructLevelValidationFailureParallel-8 5000000 296 ns/op 288 B/op 8 allocs/op
|
|
BenchmarkStructSimpleCustomTypeSuccess-8 2000000 673 ns/op 32 B/op 2 allocs/op
|
|
BenchmarkStructSimpleCustomTypeSuccessParallel-8 10000000 213 ns/op 32 B/op 2 allocs/op
|
|
BenchmarkStructSimpleCustomTypeFailure-8 1000000 1056 ns/op 392 B/op 9 allocs/op
|
|
BenchmarkStructSimpleCustomTypeFailureParallel-8 3000000 450 ns/op 408 B/op 10 allocs/op
|
|
BenchmarkStructPartialSuccess-8 2000000 789 ns/op 256 B/op 6 allocs/op
|
|
BenchmarkStructPartialSuccessParallel-8 5000000 307 ns/op 256 B/op 6 allocs/op
|
|
BenchmarkStructPartialFailure-8 1000000 1105 ns/op 464 B/op 11 allocs/op
|
|
BenchmarkStructPartialFailureParallel-8 5000000 493 ns/op 464 B/op 11 allocs/op
|
|
BenchmarkStructExceptSuccess-8 1000000 1212 ns/op 480 B/op 12 allocs/op
|
|
BenchmarkStructExceptSuccessParallel-8 10000000 282 ns/op 240 B/op 5 allocs/op
|
|
BenchmarkStructExceptFailure-8 1000000 1004 ns/op 448 B/op 10 allocs/op
|
|
BenchmarkStructExceptFailureParallel-8 5000000 452 ns/op 448 B/op 10 allocs/op
|
|
BenchmarkStructSimpleCrossFieldSuccess-8 2000000 656 ns/op 72 B/op 3 allocs/op
|
|
BenchmarkStructSimpleCrossFieldSuccessParallel-8 5000000 211 ns/op 72 B/op 3 allocs/op
|
|
BenchmarkStructSimpleCrossFieldFailure-8 2000000 968 ns/op 288 B/op 8 allocs/op
|
|
BenchmarkStructSimpleCrossFieldFailureParallel-8 5000000 406 ns/op 288 B/op 8 allocs/op
|
|
BenchmarkStructSimpleCrossStructCrossFieldSuccess-8 1000000 1000 ns/op 80 B/op 4 allocs/op
|
|
BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8 5000000 334 ns/op 80 B/op 4 allocs/op
|
|
BenchmarkStructSimpleCrossStructCrossFieldFailure-8 1000000 1324 ns/op 304 B/op 9 allocs/op
|
|
BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8 3000000 520 ns/op 304 B/op 9 allocs/op
|
|
BenchmarkStructSimpleSuccess-8 3000000 534 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkStructSimpleSuccessParallel-8 10000000 144 ns/op 0 B/op 0 allocs/op
|
|
BenchmarkStructSimpleFailure-8 1000000 1039 ns/op 392 B/op 9 allocs/op
|
|
BenchmarkStructSimpleFailureParallel-8 5000000 419 ns/op 392 B/op 9 allocs/op
|
|
BenchmarkStructComplexSuccess-8 500000 2678 ns/op 128 B/op 8 allocs/op
|
|
BenchmarkStructComplexSuccessParallel-8 2000000 874 ns/op 128 B/op 8 allocs/op
|
|
BenchmarkStructComplexFailure-8 200000 6342 ns/op 2833 B/op 53 allocs/op
|
|
BenchmarkStructComplexFailureParallel-8 1000000 2875 ns/op 2833 B/op 53 allocs/op
|
|
```
|
|
|
|
Complimentary Software
|
|
----------------------
|
|
|
|
Here is a list of software that compliments using this library either pre or post validation.
|
|
|
|
* [form](https://github.com/go-playground/form) - Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support.
|
|
* [Conform](https://github.com/leebenson/conform) - Trims, sanitizes & scrubs data based on struct tags.
|
|
|
|
How to Contribute
|
|
------
|
|
|
|
Make a pull request...
|
|
|
|
License
|
|
------
|
|
Distributed under MIT License, please see license file in code for more details.
|
|
|