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140 lines
9.0 KiB
140 lines
9.0 KiB
Package validator
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================
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<img align="right" src="https://raw.githubusercontent.com/go-playground/validator/v9/logo.png">
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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=v9)
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[](https://goreportcard.com/report/github.com/go-playground/validator)
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[](https://godoc.org/gopkg.in/go-playground/validator.v9)
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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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- 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
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- Customizable i18n aware error messages.
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- Default validator for the [gin](https://github.com/gin-gonic/gin) web framework; upgrading from v8 to v9 in gin see [here](https://github.com/go-playground/validator/tree/v9/examples/gin-upgrading-overriding)
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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.v9
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Then import the validator package into your own code.
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import "gopkg.in/go-playground/validator.v9"
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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 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:
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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.v9 for detailed usage docs.
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##### Examples:
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- [Simple](https://github.com/go-playground/validator/blob/v9/examples/simple/main.go)
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- [Custom Field Types](https://github.com/go-playground/validator/blob/v9/examples/custom/main.go)
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- [Struct Level](https://github.com/go-playground/validator/blob/v9/examples/struct-level/main.go)
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- [Translations & Custom Errors](https://github.com/go-playground/validator/blob/v9/examples/translations/main.go)
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- [Gin upgrade and/or override validator](https://github.com/go-playground/validator/tree/v9/examples/gin-upgrading-overriding)
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- [wash - an example application putting it all together](https://github.com/bluesuncorp/wash)
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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 version go1.7.1 darwin/amd64
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```go
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BenchmarkFieldSuccess-8 20000000 106 ns/op
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BenchmarkFieldSuccessParallel-8 50000000 33.7 ns/op
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BenchmarkFieldFailure-8 5000000 346 ns/op
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BenchmarkFieldFailureParallel-8 20000000 115 ns/op
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BenchmarkFieldDiveSuccess-8 2000000 739 ns/op
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BenchmarkFieldDiveSuccessParallel-8 10000000 246 ns/op
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BenchmarkFieldDiveFailure-8 1000000 1043 ns/op
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BenchmarkFieldDiveFailureParallel-8 5000000 381 ns/op
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BenchmarkFieldCustomTypeSuccess-8 5000000 270 ns/op
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BenchmarkFieldCustomTypeSuccessParallel-8 20000000 92.5 ns/op
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BenchmarkFieldCustomTypeFailure-8 5000000 331 ns/op
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BenchmarkFieldCustomTypeFailureParallel-8 20000000 132 ns/op
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BenchmarkFieldOrTagSuccess-8 2000000 874 ns/op
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BenchmarkFieldOrTagSuccessParallel-8 5000000 368 ns/op
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BenchmarkFieldOrTagFailure-8 3000000 566 ns/op
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BenchmarkFieldOrTagFailureParallel-8 5000000 427 ns/op
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BenchmarkStructLevelValidationSuccess-8 5000000 335 ns/op
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BenchmarkStructLevelValidationSuccessParallel-8 20000000 124 ns/op
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BenchmarkStructLevelValidationFailure-8 2000000 630 ns/op
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BenchmarkStructLevelValidationFailureParallel-8 10000000 298 ns/op
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BenchmarkStructSimpleCustomTypeSuccess-8 3000000 535 ns/op
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BenchmarkStructSimpleCustomTypeSuccessParallel-8 10000000 170 ns/op
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BenchmarkStructSimpleCustomTypeFailure-8 2000000 821 ns/op
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BenchmarkStructSimpleCustomTypeFailureParallel-8 5000000 379 ns/op
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BenchmarkStructFilteredSuccess-8 2000000 769 ns/op
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BenchmarkStructFilteredSuccessParallel-8 5000000 328 ns/op
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BenchmarkStructFilteredFailure-8 2000000 594 ns/op
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BenchmarkStructFilteredFailureParallel-8 10000000 244 ns/op
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BenchmarkStructPartialSuccess-8 2000000 682 ns/op
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BenchmarkStructPartialSuccessParallel-8 5000000 291 ns/op
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BenchmarkStructPartialFailure-8 1000000 1034 ns/op
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BenchmarkStructPartialFailureParallel-8 5000000 392 ns/op
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BenchmarkStructExceptSuccess-8 1000000 1014 ns/op
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BenchmarkStructExceptSuccessParallel-8 10000000 257 ns/op
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BenchmarkStructExceptFailure-8 2000000 875 ns/op
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BenchmarkStructExceptFailureParallel-8 5000000 405 ns/op
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BenchmarkStructSimpleCrossFieldSuccess-8 3000000 545 ns/op
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BenchmarkStructSimpleCrossFieldSuccessParallel-8 10000000 177 ns/op
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BenchmarkStructSimpleCrossFieldFailure-8 2000000 787 ns/op
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BenchmarkStructSimpleCrossFieldFailureParallel-8 5000000 341 ns/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccess-8 2000000 795 ns/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8 10000000 267 ns/op
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BenchmarkStructSimpleCrossStructCrossFieldFailure-8 1000000 1119 ns/op
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BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8 3000000 437 ns/op
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BenchmarkStructSimpleSuccess-8 5000000 377 ns/op
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BenchmarkStructSimpleSuccessParallel-8 20000000 110 ns/op
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BenchmarkStructSimpleFailure-8 2000000 785 ns/op
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BenchmarkStructSimpleFailureParallel-8 5000000 302 ns/op
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BenchmarkStructComplexSuccess-8 1000000 2159 ns/op
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BenchmarkStructComplexSuccessParallel-8 2000000 723 ns/op
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BenchmarkStructComplexFailure-8 300000 5237 ns/op
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BenchmarkStructComplexFailureParallel-8 1000000 2378 ns/op
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```
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Complimentary Software
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----------------------
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Here is a list of software that compliments using this library either pre or post validation.
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* [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.
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* [Conform](https://github.com/leebenson/conform) - Trims, sanitizes & scrubs data based on struct tags.
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How to Contribute
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------
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Make a pull request...
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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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