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153 lines
13 KiB
153 lines
13 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">[](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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[](https://travis-ci.org/go-playground/validator)
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[](https://coveralls.io/github/go-playground/validator?branch=master)
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[](https://goreportcard.com/report/github.com/go-playground/validator)
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[](https://pkg.go.dev/github.com/go-playground/validator/v10)
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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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- Ability to dive into both map keys and values for validation
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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/master/_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 github.com/go-playground/validator/v10
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Then import the validator package into your own code.
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import "github.com/go-playground/validator/v10"
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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 https://godoc.org/github.com/go-playground/validator for detailed usage docs.
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##### Examples:
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- [Simple](https://github.com/go-playground/validator/blob/master/_examples/simple/main.go)
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- [Custom Field Types](https://github.com/go-playground/validator/blob/master/_examples/custom/main.go)
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- [Struct Level](https://github.com/go-playground/validator/blob/master/_examples/struct-level/main.go)
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- [Translations & Custom Errors](https://github.com/go-playground/validator/blob/master/_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 (15-inch, 2017) go version go1.10.2 darwin/amd64
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```go
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goos: darwin
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goarch: amd64
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pkg: github.com/go-playground/validator
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BenchmarkFieldSuccess-8 20000000 83.6 ns/op 0 B/op 0 allocs/op
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BenchmarkFieldSuccessParallel-8 50000000 26.8 ns/op 0 B/op 0 allocs/op
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BenchmarkFieldFailure-8 5000000 291 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldFailureParallel-8 20000000 107 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldArrayDiveSuccess-8 2000000 623 ns/op 201 B/op 11 allocs/op
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BenchmarkFieldArrayDiveSuccessParallel-8 10000000 237 ns/op 201 B/op 11 allocs/op
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BenchmarkFieldArrayDiveFailure-8 2000000 859 ns/op 412 B/op 16 allocs/op
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BenchmarkFieldArrayDiveFailureParallel-8 5000000 335 ns/op 413 B/op 16 allocs/op
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BenchmarkFieldMapDiveSuccess-8 1000000 1292 ns/op 432 B/op 18 allocs/op
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BenchmarkFieldMapDiveSuccessParallel-8 3000000 467 ns/op 432 B/op 18 allocs/op
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BenchmarkFieldMapDiveFailure-8 1000000 1082 ns/op 512 B/op 16 allocs/op
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BenchmarkFieldMapDiveFailureParallel-8 5000000 425 ns/op 512 B/op 16 allocs/op
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BenchmarkFieldMapDiveWithKeysSuccess-8 1000000 1539 ns/op 480 B/op 21 allocs/op
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BenchmarkFieldMapDiveWithKeysSuccessParallel-8 3000000 613 ns/op 480 B/op 21 allocs/op
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BenchmarkFieldMapDiveWithKeysFailure-8 1000000 1413 ns/op 721 B/op 21 allocs/op
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BenchmarkFieldMapDiveWithKeysFailureParallel-8 3000000 575 ns/op 721 B/op 21 allocs/op
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BenchmarkFieldCustomTypeSuccess-8 10000000 216 ns/op 32 B/op 2 allocs/op
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BenchmarkFieldCustomTypeSuccessParallel-8 20000000 82.2 ns/op 32 B/op 2 allocs/op
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BenchmarkFieldCustomTypeFailure-8 5000000 274 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldCustomTypeFailureParallel-8 20000000 116 ns/op 208 B/op 4 allocs/op
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BenchmarkFieldOrTagSuccess-8 2000000 740 ns/op 16 B/op 1 allocs/op
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BenchmarkFieldOrTagSuccessParallel-8 3000000 474 ns/op 16 B/op 1 allocs/op
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BenchmarkFieldOrTagFailure-8 3000000 471 ns/op 224 B/op 5 allocs/op
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BenchmarkFieldOrTagFailureParallel-8 3000000 414 ns/op 224 B/op 5 allocs/op
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BenchmarkStructLevelValidationSuccess-8 10000000 213 ns/op 32 B/op 2 allocs/op
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BenchmarkStructLevelValidationSuccessParallel-8 20000000 91.8 ns/op 32 B/op 2 allocs/op
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BenchmarkStructLevelValidationFailure-8 3000000 473 ns/op 304 B/op 8 allocs/op
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BenchmarkStructLevelValidationFailureParallel-8 10000000 234 ns/op 304 B/op 8 allocs/op
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BenchmarkStructSimpleCustomTypeSuccess-8 5000000 385 ns/op 32 B/op 2 allocs/op
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BenchmarkStructSimpleCustomTypeSuccessParallel-8 10000000 161 ns/op 32 B/op 2 allocs/op
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BenchmarkStructSimpleCustomTypeFailure-8 2000000 640 ns/op 424 B/op 9 allocs/op
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BenchmarkStructSimpleCustomTypeFailureParallel-8 5000000 318 ns/op 440 B/op 10 allocs/op
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BenchmarkStructFilteredSuccess-8 2000000 597 ns/op 288 B/op 9 allocs/op
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BenchmarkStructFilteredSuccessParallel-8 10000000 266 ns/op 288 B/op 9 allocs/op
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BenchmarkStructFilteredFailure-8 3000000 454 ns/op 256 B/op 7 allocs/op
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BenchmarkStructFilteredFailureParallel-8 10000000 214 ns/op 256 B/op 7 allocs/op
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BenchmarkStructPartialSuccess-8 3000000 502 ns/op 256 B/op 6 allocs/op
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BenchmarkStructPartialSuccessParallel-8 10000000 225 ns/op 256 B/op 6 allocs/op
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BenchmarkStructPartialFailure-8 2000000 702 ns/op 480 B/op 11 allocs/op
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BenchmarkStructPartialFailureParallel-8 5000000 329 ns/op 480 B/op 11 allocs/op
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BenchmarkStructExceptSuccess-8 2000000 793 ns/op 496 B/op 12 allocs/op
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BenchmarkStructExceptSuccessParallel-8 10000000 193 ns/op 240 B/op 5 allocs/op
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BenchmarkStructExceptFailure-8 2000000 639 ns/op 464 B/op 10 allocs/op
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BenchmarkStructExceptFailureParallel-8 5000000 300 ns/op 464 B/op 10 allocs/op
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BenchmarkStructSimpleCrossFieldSuccess-8 3000000 417 ns/op 72 B/op 3 allocs/op
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BenchmarkStructSimpleCrossFieldSuccessParallel-8 10000000 163 ns/op 72 B/op 3 allocs/op
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BenchmarkStructSimpleCrossFieldFailure-8 2000000 645 ns/op 304 B/op 8 allocs/op
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BenchmarkStructSimpleCrossFieldFailureParallel-8 5000000 285 ns/op 304 B/op 8 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccess-8 3000000 588 ns/op 80 B/op 4 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8 10000000 221 ns/op 80 B/op 4 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldFailure-8 2000000 868 ns/op 320 B/op 9 allocs/op
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BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8 5000000 337 ns/op 320 B/op 9 allocs/op
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BenchmarkStructSimpleSuccess-8 5000000 260 ns/op 0 B/op 0 allocs/op
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BenchmarkStructSimpleSuccessParallel-8 20000000 90.6 ns/op 0 B/op 0 allocs/op
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BenchmarkStructSimpleFailure-8 2000000 619 ns/op 424 B/op 9 allocs/op
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BenchmarkStructSimpleFailureParallel-8 5000000 296 ns/op 424 B/op 9 allocs/op
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BenchmarkStructComplexSuccess-8 1000000 1454 ns/op 128 B/op 8 allocs/op
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BenchmarkStructComplexSuccessParallel-8 3000000 579 ns/op 128 B/op 8 allocs/op
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BenchmarkStructComplexFailure-8 300000 4140 ns/op 3041 B/op 53 allocs/op
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BenchmarkStructComplexFailureParallel-8 1000000 2127 ns/op 3041 B/op 53 allocs/op
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BenchmarkOneof-8 10000000 140 ns/op 0 B/op 0 allocs/op
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BenchmarkOneofParallel-8 20000000 70.1 ns/op 0 B/op 0 allocs/op
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```
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Complementary Software
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----------------------
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Here is a list of software that complements 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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* [mold](https://github.com/go-playground/mold) - A general library to help modify or set data within data structures and other objects
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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 within the code for more details.
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