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154 lines
5.4 KiB
154 lines
5.4 KiB
Package validator
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================
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[](https://gitter.im/bluesuncorp/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/r/bluesuncorp/validator?branch=v5)
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[](https://godoc.org/gopkg.in/bluesuncorp/validator.v5)
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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.
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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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Installation
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------------
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Use go get.
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go get gopkg.in/bluesuncorp/validator.v5
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or to update
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go get -u gopkg.in/bluesuncorp/validator.v5
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Then import the validator package into your own code.
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import "gopkg.in/bluesuncorp/validator.v5"
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Usage and documentation
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------
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Please see http://godoc.org/gopkg.in/bluesuncorp/validator.v5 for detailed usage docs.
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##### Example:
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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/bluesuncorp/validator.v5"
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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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validate = validator.New("validate", validator.BakedInValidators)
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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 *StructErrors
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errs := validate.Struct(user)
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if errs != nil {
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// err will be of type *FieldError
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err := errs.Errors["Age"]
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fmt.Println(err.Error()) // output: Field validation for "Age" failed on the "lte" tag
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fmt.Println(err.Field) // output: Age
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fmt.Println(err.Tag) // output: lte
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fmt.Println(err.Kind) // output: uint8
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fmt.Println(err.Type) // output: uint8
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fmt.Println(err.Param) // output: 130
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fmt.Println(err.Value) // output: 135
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// or if you prefer you can use the Flatten function
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// NOTE: I find this usefull when using a more hard static approach of checking field errors.
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// The above, is best for passing to some generic code to say parse the errors. i.e. I pass errs
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// to a routine which loops through the errors, creates and translates the error message into the
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// users locale and returns a map of map[string]string // field and error which I then use
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// within the HTML rendering.
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flat := errs.Flatten()
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fmt.Println(flat) // output: map[Age:Field validation for "Age" failed on the "lte" tag Addresses[0].Address.City:Field validation for "City" failed on the "required" tag]
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err = flat["Addresses[0].Address.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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```
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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
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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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BenchmarkValidateField-4 3000000 429 ns/op 192 B/op 2 allocs/op
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BenchmarkValidateStructSimple-4 500000 2877 ns/op 657 B/op 10 allocs/op
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BenchmarkTemplateParallelSimple-4 500000 3097 ns/op 657 B/op 10 allocs/op
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BenchmarkValidateStructLarge-4 100000 15228 ns/op 4350 B/op 62 allocs/op
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BenchmarkTemplateParallelLarge-4 100000 14257 ns/op 4354 B/op 62 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 brach 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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