validating

package module
v3.0.0-beta.0 Latest Latest
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 Go to latest Published: Mar 20, 2022 License: MIT Imports: 6 Imported by: 52

README

validating

A Go library for validating structs, maps and slices.

Features

  1. Simple

    Simple and stupid, no magic involved.

  2. Type-safe

    Schema is defined in Go, which is type-safer (and more powerful) than traditional struct tags.

  3. Flexible

    • Validators are composable.
    • Nested struct validation is well supported.
    • Schema can be defined inside or outside struct.
    • Validator customizations are made easy.

  4. No reflection

Installation

$ go install github.com/RussellLuo/validating/v3@latest

Validator factories and validators

To be strict, this library has a conceptual distinction between validator factory and validator.

A validator factory is a function used to create a validator, which will do the actual validation.

Built-in validator factories
Extension validator factories
Validator customizations

Examples

Documentation

Check out the Godoc.

Thanks

This library borrows some ideas from the following libraries:

License

MIT

Documentation

Overview

Example (Customizations) 
package main

import (
	"fmt"
	"time"

	v "github.com/RussellLuo/validating/v3"
)

func mapNonzero(field *v.Field) v.Errors {
	value, ok := field.Value.(map[string]time.Time)
	if !ok {
		return v.NewUnsupportedErrors(field, "mapNonzero")
	}
	if len(value) == 0 {
		return v.NewErrors(field.Name, v.ErrInvalid, "is zero valued")
	}
	return nil
}

type MyValidator struct{}

func (mv MyValidator) Validate(field *v.Field) v.Errors {
	return mapNonzero(field)
}

func main() {
	var value map[string]time.Time

	errs := v.Validate(v.Schema{
		v.F("value", value): v.Func(mapNonzero),
	})
	fmt.Printf("errs from the func-validator: %+v\n", errs)

	errs = v.Validate(v.Schema{
		v.F("value", value): MyValidator{},
	})
	fmt.Printf("errs from the struct-validator: %+v\n", errs)

}

Output:

errs from the func-validator: value: INVALID(is zero valued)
errs from the struct-validator: value: INVALID(is zero valued)
Example (NestedStruct) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

type Address struct {
	Country, Province, City string
}

type Person struct {
	Name    string
	Age     int
	Address Address
}

func main() {
	p := Person{}
	err := v.Validate(v.Schema{
		v.F("name", p.Name): v.LenString(1, 5),
		v.F("age", p.Age):   v.Gte(10),
		v.F("address", p.Address): v.Schema{
			v.F("country", p.Address.Country):   v.Nonzero[string](),
			v.F("province", p.Address.Province): v.Nonzero[string](),
			v.F("city", p.Address.City):         v.Nonzero[string](),
		},
	})
	fmt.Printf("err: %+v\n", err)
}

Output:
Example (NestedStructMap) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

type Member struct {
	Name string
}

type Person1 struct {
	Name   string
	Age    int
	Family map[string]*Member
}

func makeSchema1(p *Person1) v.Schema {
	return v.Schema{
		v.F("name", p.Name): v.LenString(1, 5),
		v.F("age", p.Age):   v.Nonzero[int](),
		v.F("family", p.Family): v.Map(func() map[string]v.Schema {
			schemas := make(map[string]v.Schema)
			for relation, member := range p.Family {
				schemas[relation] = v.Schema{
					v.F("name", member.Name): v.LenString(10, 15).Msg("is too long"),
				}
			}
			return schemas
		}),
	}
}

func main() {
	p1 := Person1{}
	err := v.Validate(makeSchema1(&p1))
	fmt.Printf("err of p1: %+v\n", err)

	p2 := Person1{Family: map[string]*Member{
		"father": {"father's name"},
		"mother": {"mother's name is long"},
	}}
	err = v.Validate(makeSchema1(&p2))
	fmt.Printf("err of p2: %+v\n", err)
}

Output:
Example (NestedStructPointer) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

type Address2 struct {
	Country, Province, City string
}

type Person2 struct {
	Name    string
	Age     int
	Address *Address2
}

func makeSchema2(p *Person2) v.Schema {
	return v.Schema{
		v.F("name", p.Name): v.LenString(1, 5),
		v.F("age", p.Age):   v.Lte(50),
		v.F("address", p.Address): v.All(
			v.Assert(p.Address != nil).Msg("is nil"),
			v.Lazy(func() v.Validator {
				return v.Schema{
					v.F("country", p.Address.Country):   v.Nonzero[string](),
					v.F("province", p.Address.Province): v.Nonzero[string](),
					v.F("city", p.Address.City):         v.Nonzero[string](),
				}
			}),
		),
	}
}

func main() {
	p1 := Person2{}
	err := v.Validate(makeSchema2(&p1))
	fmt.Printf("err of p1: %+v\n", err)

	p2 := Person2{Age: 60, Address: &Address2{}}
	err = v.Validate(makeSchema2(&p2))
	fmt.Printf("err of p2: %+v\n", err)
}

Output:
Example (NestedStructSchemaInside) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

type Address3 struct {
	Country, Province, City string
}

func (a *Address3) Schema() v.Schema {
	return v.Schema{
		v.F("country", a.Country):   v.Nonzero[string](),
		v.F("province", a.Province): v.Nonzero[string](),
		v.F("city", a.City):         v.Nonzero[string](),
	}
}

type Person3 struct {
	Name    string
	Age     int
	Address Address3
}

func (p *Person3) Schema() v.Schema {
	return v.Schema{
		v.F("name", p.Name):       v.LenString(1, 5),
		v.F("age", p.Age):         v.Gte(10),
		v.F("address", p.Address): p.Address.Schema(),
	}
}

func main() {
	p := Person3{}
	err := v.Validate(p.Schema())
	fmt.Printf("err: %+v\n", err)
}

Output:
Example (NestedStructSlice) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

type Phone struct {
	Number, Remark string
}

type Person4 struct {
	Name   string
	Age    int
	Phones []*Phone
}

func makeSchema4(p *Person4) v.Schema {
	return v.Schema{
		v.F("name", p.Name): v.LenString(1, 5),
		v.F("age", p.Age):   v.Nonzero[int](),
		v.F("phones", p.Phones): v.Slice(func() (schemas []v.Schema) {
			for _, phone := range p.Phones {
				schemas = append(schemas, v.Schema{
					v.F("number", phone.Number): v.Nonzero[string](),
					v.F("remark", phone.Remark): v.LenString(5, 7),
				})
			}
			return
		}),
	}
}

func main() {
	p1 := Person4{}
	err := v.Validate(makeSchema4(&p1))
	fmt.Printf("err of p1: %+v\n", err)

	p2 := Person4{Phones: []*Phone{
		{"13011112222", "private"},
		{"13033334444", "business"},
	}}
	err = v.Validate(makeSchema4(&p2))
	fmt.Printf("err of p2: %+v\n", err)
}

Output:
Example (SimpleMap) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

func main() {
	ages := map[string]int{
		"foo": 0,
		"bar": 1,
	}
	err := v.Validate(v.Map(func() map[string]v.Schema {
		schemas := make(map[string]v.Schema)
		for name, age := range ages {
			schemas[name] = v.Value(age, v.Nonzero[int]())
		}
		return schemas
	}))
	fmt.Printf("%+v\n", err)

}

Output:

[foo]: INVALID(is zero valued)
Example (SimpleMapEachMapValue) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

func main() {
	ages := map[string]int{
		"foo": 0,
		"bar": 1,
	}
	err := v.Validate(v.Value(ages, v.EachMapValue[map[string]int](v.Nonzero[int]())))
	fmt.Printf("%+v\n", err)

}

Output:

[foo]: INVALID(is zero valued)
Example (SimpleSlice) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

func main() {
	names := []string{"", "foo"}
	err := v.Validate(v.Slice(func() (schemas []v.Schema) {
		for _, name := range names {
			schemas = append(schemas, v.Value(name, v.Nonzero[string]()))
		}
		return schemas
	}))
	fmt.Printf("%+v\n", err)

}

Output:

[0]: INVALID(is zero valued)
Example (SimpleSliceEach) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

func main() {
	names := []string{"", "foo"}
	err := v.Validate(v.Value(names, v.Each[[]string](v.Nonzero[string]())))
	fmt.Printf("%+v\n", err)

}

Output:

[0]: INVALID(is zero valued)
Example (SimpleStringIsIP) 
package main

import (
	"fmt"
	"net"

	v "github.com/RussellLuo/validating/v3"
)

func main() {
	isIP := func(value string) bool {
		return net.ParseIP(value) != nil
	}

	value := "192.168.0."
	err := v.Validate(v.Value(value, v.Is(isIP).Msg("invalid IP")))
	fmt.Printf("%+v\n", err)

}

Output:

INVALID(invalid IP)
Example (SimpleStruct) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

type Person5 struct {
	Name string
	Age  int
}

func main() {
	p := Person5{Age: 1}
	err := v.Validate(v.Schema{
		v.F("name", p.Name): v.LenString(1, 5).Msg("length is not between 1 and 5"),
		v.F("age", p.Age):   v.Nonzero[int](),
	})
	fmt.Printf("%+v\n", err)

}

Output:

name: INVALID(length is not between 1 and 5)
Example (SimpleValue) 
package main

import (
	"fmt"

	v "github.com/RussellLuo/validating/v3"
)

func main() {
	err := v.Validate(v.Value(0, v.Range(1, 5)))
	fmt.Printf("%+v\n", err)

}

Output:

INVALID(is not between the given range)

Index

Examples

Constants

View Source 
const (
	ErrUnsupported = "UNSUPPORTED"
	ErrInvalid     = "INVALID"
)

Variables

View Source 
var And = All

And is an alias of All.

View Source 
var Array = Slice

Array is an alias of Slice.

View Source 
var Or = Any

Or is an alias of Any.

Functions

This section is empty.

Types

type AnyValidator 

type AnyValidator struct {
	// contains filtered or unexported fields
}

AnyValidator is a validator that allows users to change the returned errors by calling LastError().

func Any 

func Any(validators ...Validator) *AnyValidator

Any is a composite validator factory used to create a validator, which will succeed as long as any sub-validator succeeds.

func (*AnyValidator) LastError 

func (av *AnyValidator) LastError() *AnyValidator

LastError makes AnyValidator return the error from the last validator if all inner validators fail.

func (*AnyValidator) Validate 

func (av *AnyValidator) Validate(field *Field) Errors

Validate delegates the actual validation to its inner validators.

type Error 

type Error interface {
	error
	Field() string
	Kind() string
	Message() string
}

func NewError 

func NewError(field, kind, message string) Error

type Errors 

type Errors []Error

func NewErrors 

func NewErrors(field, kind, message string) Errors

func NewUnsupportedErrors 

func NewUnsupportedErrors(field *Field, validatorName string) Errors

func Validate 

func Validate(v Validator) (errs Errors)

Validate invokes v.Validate with an empty field.

func (*Errors) Append 

func (e *Errors) Append(errs ...Error)

func (Errors) Error 

func (e Errors) Error() string

func (Errors) Map 

func (e Errors) Map() map[string]Error

Map converts the given errors to a map[string]Error, where the keys of the map are the field names.

type Field 

type Field struct {
	Name  string
	Value interface{}
}

Field represents a (Name, Value) pair that needs to be validated.

func F 

func F(name string, value interface{}) *Field

F is a shortcut for creating a pointer to Field.

type Func 

type Func func(field *Field) Errors

Func is an adapter to allow the use of ordinary functions as validators. If f is a function with the appropriate signature, Func(f) is a Validator that calls f.

func (Func) Validate 

func (f Func) Validate(field *Field) Errors

Validate calls f(field).

type MessageValidator 

type MessageValidator struct {
	Message   string
	Validator Validator
}

MessageValidator is a validator that allows users to customize the INVALID error message by calling Msg().

func Assert 

func Assert(b bool) (mv *MessageValidator)

Assert is a leaf validator factory used to create a validator, which will succeed only when the boolean expression evaluates to true.

func Eq 

func Eq[T comparable](value T) (mv *MessageValidator)

Eq is a leaf validator factory used to create a validator, which will succeed when the field's value equals the given value.

func Gt 

func Gt[T constraints.Ordered](value T) (mv *MessageValidator)

Gt is a leaf validator factory used to create a validator, which will succeed when the field's value is greater than the given value.

func Gte 

func Gte[T constraints.Ordered](value T) (mv *MessageValidator)

Gte is a leaf validator factory used to create a validator, which will succeed when the field's value is greater than or equal to the given value.

func In 

func In[T comparable](values ...T) (mv *MessageValidator)

In is a leaf validator factory used to create a validator, which will succeed when the field's value is equal to one of the given values.

func Is 

func Is[T any](f func(T) bool) (mv *MessageValidator)

Is is a leaf validator factory used to create a validator, which will succeed when the predicate function f returns true for the field's value.

func LenSlice 

func LenSlice[T ~[]E, E any](min, max int) (mv *MessageValidator)

LenSlice is a leaf validator factory used to create a validator, which will succeed when the length of the slice field is between min and max.

func LenString 

func LenString(min, max int) (mv *MessageValidator)

LenString is a leaf validator factory used to create a validator, which will succeed when the length of the string field is between min and max.

func Lt 

func Lt[T constraints.Ordered](value T) (mv *MessageValidator)

Lt is a leaf validator factory used to create a validator, which will succeed when the field's value is lower than the given value.

func Lte 

func Lte[T constraints.Ordered](value T) (mv *MessageValidator)

Lte is a leaf validator factory used to create a validator, which will succeed when the field's value is lower than or equal to the given value.

func Match 

func Match(re *regexp.Regexp) (mv *MessageValidator)

Match is a leaf validator factory used to create a validator, which will succeed when the field's value matches the given regular expression.

func Ne 

func Ne[T comparable](value T) (mv *MessageValidator)

Ne is a leaf validator factory used to create a validator, which will succeed when the field's value does not equal the given value.

func Nin 

func Nin[T comparable](values ...T) (mv *MessageValidator)

Nin is a leaf validator factory used to create a validator, which will succeed when the field's value is not equal to any of the given values.

func Nonzero 

func Nonzero[T comparable]() (mv *MessageValidator)

Nonzero is a leaf validator factory used to create a validator, which will succeed when the field's value is nonzero.

func Not 

func Not(validator Validator) (mv *MessageValidator)

Not is a composite validator factory used to create a validator, which will succeed when the given validator fails.

func Range 

func Range[T constraints.Ordered](min, max T) (mv *MessageValidator)

Range is a leaf validator factory used to create a validator, which will succeed when the field's value is between min and max.

func RuneCount 

func RuneCount(min, max int) (mv *MessageValidator)

RuneCount is a leaf validator factory used to create a validator, which will succeed when the number of runes in the field's value is between min and max.

func Zero 

func Zero[T comparable]() (mv *MessageValidator)

Zero is a leaf validator factory used to create a validator, which will succeed when the field's value is zero.

func (*MessageValidator) Msg 

func (mv *MessageValidator) Msg(msg string) *MessageValidator

Msg sets the INVALID error message.

func (*MessageValidator) Validate 

func (mv *MessageValidator) Validate(field *Field) Errors

Validate delegates the actual validation to its inner validator.

type Schema 

type Schema map[*Field]Validator

Schema is a field mapping, which defines the corresponding validator for each field.

func Value 

func Value(value interface{}, validator Validator) Schema

Value is a shortcut function used to create a schema for a simple value.

func (Schema) Validate 

func (s Schema) Validate(field *Field) (errs Errors)

Validate validates fields per the given according to the schema.

type Validator 

type Validator interface {
	Validate(field *Field) Errors
}

Validator is an interface for representing a validating's validator.

func All 

func All(validators ...Validator) Validator

All is a composite validator factory used to create a validator, which will succeed only when all sub-validators succeed.

func Each 

func Each[T ~[]E, E any](validator Validator) Validator

Each is a composite validator factory used to create a validator, which will succeed only when validator succeeds on all elements of the slice field.

func EachMapValue 

func EachMapValue[T map[K]V, K comparable, V any](validator Validator) Validator

EachMapValue is a composite validator factory used to create a validator, which will succeed only when validator succeeds on all values of the map field.

func Lazy 

func Lazy(f func() Validator) Validator

Lazy is a composite validator factory used to create a validator, which will call f only as needed, to delegate the actual validation to the validator returned by f.

func Map 

func Map(f func() map[string]Schema) Validator

Map is a composite validator factory used to create a validator, which will do the validation per the schemas associated with a map.

func Slice 

func Slice(f func() []Schema) Validator

Slice is a composite validator factory used to create a validator, which will do the validation per the schemas associated with a slice.

func ZeroOr 

func ZeroOr[T comparable](validator Validator) Validator

ZeroOr is a composite validator factory used to create a validator, which will succeed if the field's value is zero, or if the given validator succeeds.

ZeroOr will return the error from the given validator if it fails.

Source Files

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