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620 lines
24 KiB
Markdown
620 lines
24 KiB
Markdown
govalidator
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===========
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[](https://gitter.im/asaskevich/govalidator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [](https://godoc.org/github.com/asaskevich/govalidator)
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[](https://travis-ci.org/asaskevich/govalidator)
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[](https://codecov.io/gh/asaskevich/govalidator) [](https://goreportcard.com/report/github.com/asaskevich/govalidator) [](http://go-search.org/view?id=github.com%2Fasaskevich%2Fgovalidator) [](#backers) [](#sponsors) [](https://app.fossa.io/projects/git%2Bgithub.com%2Fasaskevich%2Fgovalidator?ref=badge_shield)
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A package of validators and sanitizers for strings, structs and collections. Based on [validator.js](https://github.com/chriso/validator.js).
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#### Installation
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Make sure that Go is installed on your computer.
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Type the following command in your terminal:
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go get github.com/asaskevich/govalidator
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or you can get specified release of the package with `gopkg.in`:
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go get gopkg.in/asaskevich/govalidator.v10
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After it the package is ready to use.
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#### Import package in your project
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Add following line in your `*.go` file:
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```go
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import "github.com/asaskevich/govalidator"
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```
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If you are unhappy to use long `govalidator`, you can do something like this:
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```go
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import (
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valid "github.com/asaskevich/govalidator"
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)
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```
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#### Activate behavior to require all fields have a validation tag by default
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`SetFieldsRequiredByDefault` causes validation to fail when struct fields do not include validations or are not explicitly marked as exempt (using `valid:"-"` or `valid:"email,optional"`). A good place to activate this is a package init function or the main() function.
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`SetNilPtrAllowedByRequired` causes validation to pass when struct fields marked by `required` are set to nil. This is disabled by default for consistency, but some packages that need to be able to determine between `nil` and `zero value` state can use this. If disabled, both `nil` and `zero` values cause validation errors.
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```go
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import "github.com/asaskevich/govalidator"
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func init() {
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govalidator.SetFieldsRequiredByDefault(true)
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}
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```
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Here's some code to explain it:
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```go
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// this struct definition will fail govalidator.ValidateStruct() (and the field values do not matter):
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type exampleStruct struct {
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Name string ``
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Email string `valid:"email"`
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}
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// this, however, will only fail when Email is empty or an invalid email address:
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type exampleStruct2 struct {
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Name string `valid:"-"`
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Email string `valid:"email"`
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}
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// lastly, this will only fail when Email is an invalid email address but not when it's empty:
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type exampleStruct2 struct {
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Name string `valid:"-"`
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Email string `valid:"email,optional"`
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}
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```
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#### Recent breaking changes (see [#123](https://github.com/asaskevich/govalidator/pull/123))
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##### Custom validator function signature
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A context was added as the second parameter, for structs this is the object being validated – this makes dependent validation possible.
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```go
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import "github.com/asaskevich/govalidator"
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// old signature
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func(i interface{}) bool
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// new signature
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func(i interface{}, o interface{}) bool
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```
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##### Adding a custom validator
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This was changed to prevent data races when accessing custom validators.
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```go
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import "github.com/asaskevich/govalidator"
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// before
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govalidator.CustomTypeTagMap["customByteArrayValidator"] = func(i interface{}, o interface{}) bool {
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// ...
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}
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// after
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govalidator.CustomTypeTagMap.Set("customByteArrayValidator", func(i interface{}, o interface{}) bool {
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// ...
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})
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```
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#### List of functions:
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```go
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func Abs(value float64) float64
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func BlackList(str, chars string) string
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func ByteLength(str string, params ...string) bool
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func CamelCaseToUnderscore(str string) string
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func Contains(str, substring string) bool
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func Count(array []interface{}, iterator ConditionIterator) int
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func Each(array []interface{}, iterator Iterator)
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func ErrorByField(e error, field string) string
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func ErrorsByField(e error) map[string]string
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func Filter(array []interface{}, iterator ConditionIterator) []interface{}
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func Find(array []interface{}, iterator ConditionIterator) interface{}
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func GetLine(s string, index int) (string, error)
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func GetLines(s string) []string
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func HasLowerCase(str string) bool
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func HasUpperCase(str string) bool
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func HasWhitespace(str string) bool
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func HasWhitespaceOnly(str string) bool
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func InRange(value interface{}, left interface{}, right interface{}) bool
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func InRangeFloat32(value, left, right float32) bool
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func InRangeFloat64(value, left, right float64) bool
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func InRangeInt(value, left, right interface{}) bool
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func IsASCII(str string) bool
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func IsAlpha(str string) bool
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func IsAlphanumeric(str string) bool
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func IsBase64(str string) bool
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func IsByteLength(str string, min, max int) bool
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func IsCIDR(str string) bool
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func IsCRC32(str string) bool
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func IsCRC32b(str string) bool
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func IsCreditCard(str string) bool
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func IsDNSName(str string) bool
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func IsDataURI(str string) bool
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func IsDialString(str string) bool
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func IsDivisibleBy(str, num string) bool
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func IsEmail(str string) bool
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func IsExistingEmail(email string) bool
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func IsFilePath(str string) (bool, int)
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func IsFloat(str string) bool
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func IsFullWidth(str string) bool
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func IsHalfWidth(str string) bool
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func IsHash(str string, algorithm string) bool
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func IsHexadecimal(str string) bool
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func IsHexcolor(str string) bool
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func IsHost(str string) bool
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func IsIP(str string) bool
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func IsIPv4(str string) bool
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func IsIPv6(str string) bool
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func IsISBN(str string, version int) bool
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func IsISBN10(str string) bool
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func IsISBN13(str string) bool
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func IsISO3166Alpha2(str string) bool
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func IsISO3166Alpha3(str string) bool
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func IsISO4217(str string) bool
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func IsISO693Alpha2(str string) bool
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func IsISO693Alpha3b(str string) bool
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func IsIn(str string, params ...string) bool
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func IsInRaw(str string, params ...string) bool
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func IsInt(str string) bool
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func IsJSON(str string) bool
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func IsLatitude(str string) bool
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func IsLongitude(str string) bool
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func IsLowerCase(str string) bool
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func IsMAC(str string) bool
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func IsMD4(str string) bool
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func IsMD5(str string) bool
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func IsMagnetURI(str string) bool
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func IsMongoID(str string) bool
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func IsMultibyte(str string) bool
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func IsNatural(value float64) bool
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func IsNegative(value float64) bool
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func IsNonNegative(value float64) bool
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func IsNonPositive(value float64) bool
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func IsNotNull(str string) bool
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func IsNull(str string) bool
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func IsNumeric(str string) bool
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func IsPort(str string) bool
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func IsPositive(value float64) bool
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func IsPrintableASCII(str string) bool
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func IsRFC3339(str string) bool
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func IsRFC3339WithoutZone(str string) bool
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func IsRGBcolor(str string) bool
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func IsRequestURI(rawurl string) bool
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func IsRequestURL(rawurl string) bool
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func IsRipeMD128(str string) bool
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func IsRipeMD160(str string) bool
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func IsRsaPub(str string, params ...string) bool
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func IsRsaPublicKey(str string, keylen int) bool
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func IsSHA1(str string) bool
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func IsSHA256(str string) bool
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func IsSHA384(str string) bool
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func IsSHA512(str string) bool
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func IsSSN(str string) bool
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func IsSemver(str string) bool
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func IsTiger128(str string) bool
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func IsTiger160(str string) bool
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func IsTiger192(str string) bool
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func IsTime(str string, format string) bool
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func IsType(v interface{}, params ...string) bool
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func IsURL(str string) bool
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func IsUTFDigit(str string) bool
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func IsUTFLetter(str string) bool
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func IsUTFLetterNumeric(str string) bool
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func IsUTFNumeric(str string) bool
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func IsUUID(str string) bool
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func IsUUIDv3(str string) bool
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func IsUUIDv4(str string) bool
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func IsUUIDv5(str string) bool
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func IsUnixTime(str string) bool
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func IsUpperCase(str string) bool
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func IsVariableWidth(str string) bool
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func IsWhole(value float64) bool
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func LeftTrim(str, chars string) string
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func Map(array []interface{}, iterator ResultIterator) []interface{}
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func Matches(str, pattern string) bool
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func MaxStringLength(str string, params ...string) bool
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func MinStringLength(str string, params ...string) bool
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func NormalizeEmail(str string) (string, error)
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func PadBoth(str string, padStr string, padLen int) string
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func PadLeft(str string, padStr string, padLen int) string
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func PadRight(str string, padStr string, padLen int) string
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func PrependPathToErrors(err error, path string) error
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func Range(str string, params ...string) bool
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func RemoveTags(s string) string
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func ReplacePattern(str, pattern, replace string) string
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func Reverse(s string) string
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func RightTrim(str, chars string) string
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func RuneLength(str string, params ...string) bool
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func SafeFileName(str string) string
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func SetFieldsRequiredByDefault(value bool)
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func SetNilPtrAllowedByRequired(value bool)
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func Sign(value float64) float64
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func StringLength(str string, params ...string) bool
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func StringMatches(s string, params ...string) bool
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func StripLow(str string, keepNewLines bool) string
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func ToBoolean(str string) (bool, error)
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func ToFloat(str string) (float64, error)
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func ToInt(value interface{}) (res int64, err error)
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func ToJSON(obj interface{}) (string, error)
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func ToString(obj interface{}) string
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func Trim(str, chars string) string
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func Truncate(str string, length int, ending string) string
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func TruncatingErrorf(str string, args ...interface{}) error
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func UnderscoreToCamelCase(s string) string
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func ValidateMap(inputMap map[string]interface{}, validationMap map[string]interface{}) (bool, error)
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func ValidateStruct(s interface{}) (bool, error)
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func WhiteList(str, chars string) string
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type ConditionIterator
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type CustomTypeValidator
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type Error
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func (e Error) Error() string
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type Errors
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func (es Errors) Error() string
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func (es Errors) Errors() []error
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type ISO3166Entry
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type ISO693Entry
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type InterfaceParamValidator
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type Iterator
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type ParamValidator
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type ResultIterator
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type UnsupportedTypeError
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func (e *UnsupportedTypeError) Error() string
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type Validator
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```
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#### Examples
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###### IsURL
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```go
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println(govalidator.IsURL(`http://user@pass:domain.com/path/page`))
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```
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###### IsType
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```go
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println(govalidator.IsType("Bob", "string"))
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println(govalidator.IsType(1, "int"))
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i := 1
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println(govalidator.IsType(&i, "*int"))
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```
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IsType can be used through the tag `type` which is essential for map validation:
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```go
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type User struct {
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Name string `valid:"type(string)"`
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Age int `valid:"type(int)"`
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Meta interface{} `valid:"type(string)"`
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}
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result, err := govalidator.ValidateStruct(User{"Bob", 20, "meta"})
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if err != nil {
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println("error: " + err.Error())
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}
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println(result)
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```
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###### ToString
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```go
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type User struct {
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FirstName string
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LastName string
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}
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str := govalidator.ToString(&User{"John", "Juan"})
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println(str)
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```
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###### Each, Map, Filter, Count for slices
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Each iterates over the slice/array and calls Iterator for every item
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```go
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data := []interface{}{1, 2, 3, 4, 5}
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var fn govalidator.Iterator = func(value interface{}, index int) {
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println(value.(int))
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}
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govalidator.Each(data, fn)
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```
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```go
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data := []interface{}{1, 2, 3, 4, 5}
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var fn govalidator.ResultIterator = func(value interface{}, index int) interface{} {
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return value.(int) * 3
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}
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_ = govalidator.Map(data, fn) // result = []interface{}{1, 6, 9, 12, 15}
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```
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```go
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data := []interface{}{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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var fn govalidator.ConditionIterator = func(value interface{}, index int) bool {
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return value.(int)%2 == 0
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}
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_ = govalidator.Filter(data, fn) // result = []interface{}{2, 4, 6, 8, 10}
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_ = govalidator.Count(data, fn) // result = 5
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```
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###### ValidateStruct [#2](https://github.com/asaskevich/govalidator/pull/2)
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If you want to validate structs, you can use tag `valid` for any field in your structure. All validators used with this field in one tag are separated by comma. If you want to skip validation, place `-` in your tag. If you need a validator that is not on the list below, you can add it like this:
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```go
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govalidator.TagMap["duck"] = govalidator.Validator(func(str string) bool {
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return str == "duck"
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})
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```
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For completely custom validators (interface-based), see below.
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Here is a list of available validators for struct fields (validator - used function):
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```go
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"email": IsEmail,
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"url": IsURL,
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"dialstring": IsDialString,
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"requrl": IsRequestURL,
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"requri": IsRequestURI,
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"alpha": IsAlpha,
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"utfletter": IsUTFLetter,
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"alphanum": IsAlphanumeric,
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"utfletternum": IsUTFLetterNumeric,
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"numeric": IsNumeric,
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"utfnumeric": IsUTFNumeric,
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"utfdigit": IsUTFDigit,
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"hexadecimal": IsHexadecimal,
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"hexcolor": IsHexcolor,
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"rgbcolor": IsRGBcolor,
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"lowercase": IsLowerCase,
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"uppercase": IsUpperCase,
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"int": IsInt,
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"float": IsFloat,
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"null": IsNull,
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"uuid": IsUUID,
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"uuidv3": IsUUIDv3,
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"uuidv4": IsUUIDv4,
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"uuidv5": IsUUIDv5,
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"creditcard": IsCreditCard,
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"isbn10": IsISBN10,
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"isbn13": IsISBN13,
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"json": IsJSON,
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"multibyte": IsMultibyte,
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"ascii": IsASCII,
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"printableascii": IsPrintableASCII,
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"fullwidth": IsFullWidth,
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"halfwidth": IsHalfWidth,
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"variablewidth": IsVariableWidth,
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"base64": IsBase64,
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"datauri": IsDataURI,
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"ip": IsIP,
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"port": IsPort,
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"ipv4": IsIPv4,
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"ipv6": IsIPv6,
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"dns": IsDNSName,
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"host": IsHost,
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"mac": IsMAC,
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"latitude": IsLatitude,
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"longitude": IsLongitude,
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"ssn": IsSSN,
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"semver": IsSemver,
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"rfc3339": IsRFC3339,
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"rfc3339WithoutZone": IsRFC3339WithoutZone,
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"ISO3166Alpha2": IsISO3166Alpha2,
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"ISO3166Alpha3": IsISO3166Alpha3,
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```
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Validators with parameters
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```go
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"range(min|max)": Range,
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"length(min|max)": ByteLength,
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"runelength(min|max)": RuneLength,
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"stringlength(min|max)": StringLength,
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"matches(pattern)": StringMatches,
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"in(string1|string2|...|stringN)": IsIn,
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"rsapub(keylength)" : IsRsaPub,
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"minstringlength(int): MinStringLength,
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"maxstringlength(int): MaxStringLength,
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```
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Validators with parameters for any type
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```go
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"type(type)": IsType,
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```
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And here is small example of usage:
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```go
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type Post struct {
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Title string `valid:"alphanum,required"`
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Message string `valid:"duck,ascii"`
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Message2 string `valid:"animal(dog)"`
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AuthorIP string `valid:"ipv4"`
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Date string `valid:"-"`
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}
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post := &Post{
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Title: "My Example Post",
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Message: "duck",
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Message2: "dog",
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AuthorIP: "123.234.54.3",
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}
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// Add your own struct validation tags
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govalidator.TagMap["duck"] = govalidator.Validator(func(str string) bool {
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return str == "duck"
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})
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// Add your own struct validation tags with parameter
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govalidator.ParamTagMap["animal"] = govalidator.ParamValidator(func(str string, params ...string) bool {
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species := params[0]
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return str == species
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})
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govalidator.ParamTagRegexMap["animal"] = regexp.MustCompile("^animal\\((\\w+)\\)$")
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result, err := govalidator.ValidateStruct(post)
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if err != nil {
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println("error: " + err.Error())
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}
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println(result)
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```
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###### ValidateMap [#2](https://github.com/asaskevich/govalidator/pull/338)
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If you want to validate maps, you can use the map to be validated and a validation map that contain the same tags used in ValidateStruct, both maps have to be in the form `map[string]interface{}`
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So here is small example of usage:
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```go
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var mapTemplate = map[string]interface{}{
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"name":"required,alpha",
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"family":"required,alpha",
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"email":"required,email",
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"cell-phone":"numeric",
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"address":map[string]interface{}{
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"line1":"required,alphanum",
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"line2":"alphanum",
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"postal-code":"numeric",
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},
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}
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var inputMap = map[string]interface{}{
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"name":"Bob",
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"family":"Smith",
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"email":"foo@bar.baz",
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"address":map[string]interface{}{
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"line1":"",
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"line2":"",
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"postal-code":"",
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},
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}
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result, err := govalidator.ValidateMap(inputMap, mapTemplate)
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if err != nil {
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println("error: " + err.Error())
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}
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println(result)
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```
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###### WhiteList
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```go
|
||
// Remove all characters from string ignoring characters between "a" and "z"
|
||
println(govalidator.WhiteList("a3a43a5a4a3a2a23a4a5a4a3a4", "a-z") == "aaaaaaaaaaaa")
|
||
```
|
||
|
||
###### Custom validation functions
|
||
Custom validation using your own domain specific validators is also available - here's an example of how to use it:
|
||
```go
|
||
import "github.com/asaskevich/govalidator"
|
||
|
||
type CustomByteArray [6]byte // custom types are supported and can be validated
|
||
|
||
type StructWithCustomByteArray struct {
|
||
ID CustomByteArray `valid:"customByteArrayValidator,customMinLengthValidator"` // multiple custom validators are possible as well and will be evaluated in sequence
|
||
Email string `valid:"email"`
|
||
CustomMinLength int `valid:"-"`
|
||
}
|
||
|
||
govalidator.CustomTypeTagMap.Set("customByteArrayValidator", func(i interface{}, context interface{}) bool {
|
||
switch v := context.(type) { // you can type switch on the context interface being validated
|
||
case StructWithCustomByteArray:
|
||
// you can check and validate against some other field in the context,
|
||
// return early or not validate against the context at all – your choice
|
||
case SomeOtherType:
|
||
// ...
|
||
default:
|
||
// expecting some other type? Throw/panic here or continue
|
||
}
|
||
|
||
switch v := i.(type) { // type switch on the struct field being validated
|
||
case CustomByteArray:
|
||
for _, e := range v { // this validator checks that the byte array is not empty, i.e. not all zeroes
|
||
if e != 0 {
|
||
return true
|
||
}
|
||
}
|
||
}
|
||
return false
|
||
})
|
||
govalidator.CustomTypeTagMap.Set("customMinLengthValidator", func(i interface{}, context interface{}) bool {
|
||
switch v := context.(type) { // this validates a field against the value in another field, i.e. dependent validation
|
||
case StructWithCustomByteArray:
|
||
return len(v.ID) >= v.CustomMinLength
|
||
}
|
||
return false
|
||
})
|
||
```
|
||
|
||
###### Loop over Error()
|
||
By default .Error() returns all errors in a single String. To access each error you can do this:
|
||
```go
|
||
if err != nil {
|
||
errs := err.(govalidator.Errors).Errors()
|
||
for _, e := range errs {
|
||
fmt.Println(e.Error())
|
||
}
|
||
}
|
||
```
|
||
|
||
###### Custom error messages
|
||
Custom error messages are supported via annotations by adding the `~` separator - here's an example of how to use it:
|
||
```go
|
||
type Ticket struct {
|
||
Id int64 `json:"id"`
|
||
FirstName string `json:"firstname" valid:"required~First name is blank"`
|
||
}
|
||
```
|
||
|
||
#### Notes
|
||
Documentation is available here: [godoc.org](https://godoc.org/github.com/asaskevich/govalidator).
|
||
Full information about code coverage is also available here: [govalidator on gocover.io](http://gocover.io/github.com/asaskevich/govalidator).
|
||
|
||
#### Support
|
||
If you do have a contribution to the package, feel free to create a Pull Request or an Issue.
|
||
|
||
#### What to contribute
|
||
If you don't know what to do, there are some features and functions that need to be done
|
||
|
||
- [ ] Refactor code
|
||
- [ ] Edit docs and [README](https://github.com/asaskevich/govalidator/README.md): spellcheck, grammar and typo check
|
||
- [ ] Create actual list of contributors and projects that currently using this package
|
||
- [ ] Resolve [issues and bugs](https://github.com/asaskevich/govalidator/issues)
|
||
- [ ] Update actual [list of functions](https://github.com/asaskevich/govalidator#list-of-functions)
|
||
- [ ] Update [list of validators](https://github.com/asaskevich/govalidator#validatestruct-2) that available for `ValidateStruct` and add new
|
||
- [ ] Implement new validators: `IsFQDN`, `IsIMEI`, `IsPostalCode`, `IsISIN`, `IsISRC` etc
|
||
- [x] Implement [validation by maps](https://github.com/asaskevich/govalidator/issues/224)
|
||
- [ ] Implement fuzzing testing
|
||
- [ ] Implement some struct/map/array utilities
|
||
- [ ] Implement map/array validation
|
||
- [ ] Implement benchmarking
|
||
- [ ] Implement batch of examples
|
||
- [ ] Look at forks for new features and fixes
|
||
|
||
#### Advice
|
||
Feel free to create what you want, but keep in mind when you implement new features:
|
||
- Code must be clear and readable, names of variables/constants clearly describes what they are doing
|
||
- Public functions must be documented and described in source file and added to README.md to the list of available functions
|
||
- There are must be unit-tests for any new functions and improvements
|
||
|
||
## Credits
|
||
### Contributors
|
||
|
||
This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
|
||
|
||
#### Special thanks to [contributors](https://github.com/asaskevich/govalidator/graphs/contributors)
|
||
* [Daniel Lohse](https://github.com/annismckenzie)
|
||
* [Attila Oláh](https://github.com/attilaolah)
|
||
* [Daniel Korner](https://github.com/Dadie)
|
||
* [Steven Wilkin](https://github.com/stevenwilkin)
|
||
* [Deiwin Sarjas](https://github.com/deiwin)
|
||
* [Noah Shibley](https://github.com/slugmobile)
|
||
* [Nathan Davies](https://github.com/nathj07)
|
||
* [Matt Sanford](https://github.com/mzsanford)
|
||
* [Simon ccl1115](https://github.com/ccl1115)
|
||
|
||
<a href="https://github.com/asaskevich/govalidator/graphs/contributors"><img src="https://opencollective.com/govalidator/contributors.svg?width=890" /></a>
|
||
|
||
|
||
### Backers
|
||
|
||
Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/govalidator#backer)]
|
||
|
||
<a href="https://opencollective.com/govalidator#backers" target="_blank"><img src="https://opencollective.com/govalidator/backers.svg?width=890"></a>
|
||
|
||
|
||
### Sponsors
|
||
|
||
Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/govalidator#sponsor)]
|
||
|
||
<a href="https://opencollective.com/govalidator/sponsor/0/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/0/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/1/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/1/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/2/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/2/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/3/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/3/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/4/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/4/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/5/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/5/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/6/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/6/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/7/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/7/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/8/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/8/avatar.svg"></a>
|
||
<a href="https://opencollective.com/govalidator/sponsor/9/website" target="_blank"><img src="https://opencollective.com/govalidator/sponsor/9/avatar.svg"></a>
|
||
|
||
|
||
|
||
|
||
## License
|
||
[](https://app.fossa.io/projects/git%2Bgithub.com%2Fasaskevich%2Fgovalidator?ref=badge_large)
|