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140 lines
11 KiB
140 lines
11 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 go1.7.4 darwin/amd64
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```go
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BenchmarkFieldSuccess-8 20000000 107 ns/op 0 B/op 0 allocs/op
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BenchmarkFieldSuccessParallel-8 50000000 33.6 ns/op 0 B/op 0 allocs/op
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BenchmarkFieldFailure-8 5000000 333 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldFailureParallel-8 20000000 117 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldDiveSuccess-8 2000000 766 ns/op 201 B/op 11 allocs/op
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BenchmarkFieldDiveSuccessParallel-8 10000000 232 ns/op 201 B/op 11 allocs/op
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BenchmarkFieldDiveFailure-8 2000000 1000 ns/op 412 B/op 16 allocs/op
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BenchmarkFieldDiveFailureParallel-8 5000000 337 ns/op 413 B/op 16 allocs/op
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BenchmarkFieldCustomTypeSuccess-8 5000000 264 ns/op 32 B/op 2 allocs/op
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BenchmarkFieldCustomTypeSuccessParallel-8 20000000 83.5 ns/op 32 B/op 2 allocs/op
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BenchmarkFieldCustomTypeFailure-8 5000000 343 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldCustomTypeFailureParallel-8 20000000 122 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldOrTagSuccess-8 2000000 872 ns/op 16 B/op 1 allocs/op
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BenchmarkFieldOrTagSuccessParallel-8 3000000 410 ns/op 16 B/op 1 allocs/op
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BenchmarkFieldOrTagFailure-8 3000000 569 ns/op 224 B/op 5 allocs/op
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BenchmarkFieldOrTagFailureParallel-8 3000000 407 ns/op 224 B/op 5 allocs/op
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BenchmarkStructLevelValidationSuccess-8 5000000 268 ns/op 32 B/op 2 allocs/op
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BenchmarkStructLevelValidationSuccessParallel-8 20000000 83.3 ns/op 32 B/op 2 allocs/op
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BenchmarkStructLevelValidationFailure-8 3000000 567 ns/op 304 B/op 8 allocs/op
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BenchmarkStructLevelValidationFailureParallel-8 10000000 204 ns/op 304 B/op 8 allocs/op
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BenchmarkStructSimpleCustomTypeSuccess-8 3000000 457 ns/op 32 B/op 2 allocs/op
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BenchmarkStructSimpleCustomTypeSuccessParallel-8 10000000 136 ns/op 32 B/op 2 allocs/op
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BenchmarkStructSimpleCustomTypeFailure-8 2000000 757 ns/op 424 B/op 9 allocs/op
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BenchmarkStructSimpleCustomTypeFailureParallel-8 5000000 310 ns/op 440 B/op 10 allocs/op
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BenchmarkStructFilteredSuccess-8 2000000 678 ns/op 288 B/op 9 allocs/op
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BenchmarkStructFilteredSuccessParallel-8 10000000 258 ns/op 288 B/op 9 allocs/op
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BenchmarkStructFilteredFailure-8 3000000 521 ns/op 256 B/op 7 allocs/op
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BenchmarkStructFilteredFailureParallel-8 10000000 197 ns/op 256 B/op 7 allocs/op
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BenchmarkStructPartialSuccess-8 2000000 602 ns/op 256 B/op 6 allocs/op
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BenchmarkStructPartialSuccessParallel-8 10000000 241 ns/op 256 B/op 6 allocs/op
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BenchmarkStructPartialFailure-8 2000000 866 ns/op 480 B/op 11 allocs/op
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BenchmarkStructPartialFailureParallel-8 5000000 347 ns/op 480 B/op 11 allocs/op
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BenchmarkStructExceptSuccess-8 2000000 955 ns/op 496 B/op 12 allocs/op
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BenchmarkStructExceptSuccessParallel-8 10000000 209 ns/op 240 B/op 5 allocs/op
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BenchmarkStructExceptFailure-8 2000000 809 ns/op 464 B/op 10 allocs/op
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BenchmarkStructExceptFailureParallel-8 5000000 335 ns/op 464 B/op 10 allocs/op
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BenchmarkStructSimpleCrossFieldSuccess-8 3000000 469 ns/op 72 B/op 3 allocs/op
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BenchmarkStructSimpleCrossFieldSuccessParallel-8 10000000 167 ns/op 72 B/op 3 allocs/op
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BenchmarkStructSimpleCrossFieldFailure-8 2000000 714 ns/op 304 B/op 8 allocs/op
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BenchmarkStructSimpleCrossFieldFailureParallel-8 5000000 278 ns/op 304 B/op 8 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccess-8 2000000 660 ns/op 80 B/op 4 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8 10000000 244 ns/op 80 B/op 4 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldFailure-8 2000000 939 ns/op 320 B/op 9 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8 5000000 382 ns/op 320 B/op 9 allocs/op
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BenchmarkStructSimpleSuccess-8 5000000 287 ns/op 0 B/op 0 allocs/op
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BenchmarkStructSimpleSuccessParallel-8 20000000 90.5 ns/op 0 B/op 0 allocs/op
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BenchmarkStructSimpleFailure-8 2000000 712 ns/op 424 B/op 9 allocs/op
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BenchmarkStructSimpleFailureParallel-8 5000000 298 ns/op 424 B/op 9 allocs/op
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BenchmarkStructComplexSuccess-8 1000000 1645 ns/op 128 B/op 8 allocs/op
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BenchmarkStructComplexSuccessParallel-8 3000000 544 ns/op 128 B/op 8 allocs/op
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BenchmarkStructComplexFailure-8 300000 4688 ns/op 3041 B/op 53 allocs/op
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BenchmarkStructComplexFailureParallel-8 1000000 2064 ns/op 3041 B/op 53 allocs/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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