correct required tag functionality for pointers, now works like old `exists` tag.

README.md

@@ -2,7 +2,7 @@ Package validator
 ================
 <img align="right" src="https://raw.githubusercontent.com/go-playground/validator/v9/logo.png">
 [![Join the chat at https://gitter.im/go-playground/validator](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-![Project status](https://img.shields.io/badge/version-9.2.0-green.svg)
+![Project status](https://img.shields.io/badge/version-9.2.1-green.svg)
 [![Build Status](https://semaphoreci.com/api/v1/joeybloggs/validator/branches/v9/badge.svg)](https://semaphoreci.com/joeybloggs/validator)
 [![Coverage Status](https://coveralls.io/repos/go-playground/validator/badge.svg?branch=v9&service=github)](https://coveralls.io/github/go-playground/validator?branch=v9)
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/validator)](https://goreportcard.com/report/github.com/go-playground/validator)
@@ -66,60 +66,60 @@ Please see http://godoc.org/gopkg.in/go-playground/validator.v9 for detailed usa
 
 Benchmarks
 ------
-###### 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 darwin/amd64
+###### 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
 ```go
-BenchmarkFieldSuccess-8                                       	20000000	       104 ns/op	       0 B/op	       0 allocs/op
+BenchmarkFieldSuccess-8                                       	20000000	       106 ns/op
-BenchmarkFieldSuccessParallel-8                               	50000000	        34.5 ns/op	       0 B/op	       0 allocs/op
+BenchmarkFieldSuccessParallel-8                               	50000000	        33.7 ns/op
-BenchmarkFieldFailure-8                                       	 5000000	       335 ns/op	     208 B/op	       4 allocs/op
+BenchmarkFieldFailure-8                                       	 5000000	       346 ns/op
-BenchmarkFieldFailureParallel-8                               	20000000	       118 ns/op	     208 B/op	       4 allocs/op
+BenchmarkFieldFailureParallel-8                               	20000000	       115 ns/op
-BenchmarkFieldDiveSuccess-8                                   	 2000000	       718 ns/op	     201 B/op	      11 allocs/op
+BenchmarkFieldDiveSuccess-8                                   	 2000000	       739 ns/op
-BenchmarkFieldDiveSuccessParallel-8                           	10000000	       234 ns/op	     201 B/op	      11 allocs/op
+BenchmarkFieldDiveSuccessParallel-8                           	10000000	       246 ns/op
-BenchmarkFieldDiveFailure-8                                   	 2000000	       971 ns/op	     412 B/op	      16 allocs/op
+BenchmarkFieldDiveFailure-8                                   	 1000000	      1043 ns/op
-BenchmarkFieldDiveFailureParallel-8                           	 5000000	       341 ns/op	     413 B/op	      16 allocs/op
+BenchmarkFieldDiveFailureParallel-8                           	 5000000	       381 ns/op
-BenchmarkFieldCustomTypeSuccess-8                             	 5000000	       268 ns/op	      32 B/op	       2 allocs/op
+BenchmarkFieldCustomTypeSuccess-8                             	 5000000	       270 ns/op
-BenchmarkFieldCustomTypeSuccessParallel-8                     	20000000	        82.3 ns/op	      32 B/op	       2 allocs/op
+BenchmarkFieldCustomTypeSuccessParallel-8                     	20000000	        92.5 ns/op
-BenchmarkFieldCustomTypeFailure-8                             	 5000000	       331 ns/op	     208 B/op	       4 allocs/op
+BenchmarkFieldCustomTypeFailure-8                             	 5000000	       331 ns/op
-BenchmarkFieldCustomTypeFailureParallel-8                     	20000000	       116 ns/op	     208 B/op	       4 allocs/op
+BenchmarkFieldCustomTypeFailureParallel-8                     	20000000	       132 ns/op
-BenchmarkFieldOrTagSuccess-8                                  	 2000000	       872 ns/op	      16 B/op	       1 allocs/op
+BenchmarkFieldOrTagSuccess-8                                  	 2000000	       874 ns/op
-BenchmarkFieldOrTagSuccessParallel-8                          	 5000000	       389 ns/op	      16 B/op	       1 allocs/op
+BenchmarkFieldOrTagSuccessParallel-8                          	 5000000	       368 ns/op
-BenchmarkFieldOrTagFailure-8                                  	 3000000	       569 ns/op	     224 B/op	       5 allocs/op
+BenchmarkFieldOrTagFailure-8                                  	 3000000	       566 ns/op
-BenchmarkFieldOrTagFailureParallel-8                          	 5000000	       397 ns/op	     224 B/op	       5 allocs/op
+BenchmarkFieldOrTagFailureParallel-8                          	 5000000	       427 ns/op
-BenchmarkStructLevelValidationSuccess-8                       	 5000000	       334 ns/op	      32 B/op	       2 allocs/op
+BenchmarkStructLevelValidationSuccess-8                       	 5000000	       335 ns/op
-BenchmarkStructLevelValidationSuccessParallel-8               	20000000	       111 ns/op	      32 B/op	       2 allocs/op
+BenchmarkStructLevelValidationSuccessParallel-8               	20000000	       124 ns/op
-BenchmarkStructLevelValidationFailure-8                       	 2000000	       622 ns/op	     304 B/op	       8 allocs/op
+BenchmarkStructLevelValidationFailure-8                       	 2000000	       630 ns/op
-BenchmarkStructLevelValidationFailureParallel-8               	10000000	       274 ns/op	     304 B/op	       8 allocs/op
+BenchmarkStructLevelValidationFailureParallel-8               	10000000	       298 ns/op
-BenchmarkStructSimpleCustomTypeSuccess-8                      	 3000000	       525 ns/op	      32 B/op	       2 allocs/op
+BenchmarkStructSimpleCustomTypeSuccess-8                      	 3000000	       535 ns/op
-BenchmarkStructSimpleCustomTypeSuccessParallel-8              	10000000	       165 ns/op	      32 B/op	       2 allocs/op
+BenchmarkStructSimpleCustomTypeSuccessParallel-8              	10000000	       170 ns/op
-BenchmarkStructSimpleCustomTypeFailure-8                      	 2000000	       826 ns/op	     424 B/op	       9 allocs/op
+BenchmarkStructSimpleCustomTypeFailure-8                      	 2000000	       821 ns/op
-BenchmarkStructSimpleCustomTypeFailureParallel-8              	 5000000	       378 ns/op	     440 B/op	      10 allocs/op
+BenchmarkStructSimpleCustomTypeFailureParallel-8              	 5000000	       379 ns/op
-BenchmarkStructFilteredSuccess-8                              	 2000000	       734 ns/op	     288 B/op	       9 allocs/op
+BenchmarkStructFilteredSuccess-8                              	 2000000	       769 ns/op
-BenchmarkStructFilteredSuccessParallel-8                      	 5000000	       313 ns/op	     288 B/op	       9 allocs/op
+BenchmarkStructFilteredSuccessParallel-8                      	 5000000	       328 ns/op
-BenchmarkStructFilteredFailure-8                              	 2000000	       592 ns/op	     256 B/op	       7 allocs/op
+BenchmarkStructFilteredFailure-8                              	 2000000	       594 ns/op
-BenchmarkStructFilteredFailureParallel-8                      	10000000	       272 ns/op	     256 B/op	       7 allocs/op
+BenchmarkStructFilteredFailureParallel-8                      	10000000	       244 ns/op
-BenchmarkStructPartialSuccess-8                               	 2000000	       682 ns/op	     256 B/op	       6 allocs/op
+BenchmarkStructPartialSuccess-8                               	 2000000	       682 ns/op
-BenchmarkStructPartialSuccessParallel-8                       	10000000	       279 ns/op	     256 B/op	       6 allocs/op
+BenchmarkStructPartialSuccessParallel-8                       	 5000000	       291 ns/op
-BenchmarkStructPartialFailure-8                               	 2000000	       938 ns/op	     480 B/op	      11 allocs/op
+BenchmarkStructPartialFailure-8                               	 1000000	      1034 ns/op
-BenchmarkStructPartialFailureParallel-8                       	 5000000	       398 ns/op	     480 B/op	      11 allocs/op
+BenchmarkStructPartialFailureParallel-8                       	 5000000	       392 ns/op
-BenchmarkStructExceptSuccess-8                                	 1000000	      1088 ns/op	     496 B/op	      12 allocs/op
+BenchmarkStructExceptSuccess-8                                	 1000000	      1014 ns/op
-BenchmarkStructExceptSuccessParallel-8                        	10000000	       257 ns/op	     240 B/op	       5 allocs/op
+BenchmarkStructExceptSuccessParallel-8                        	10000000	       257 ns/op
-BenchmarkStructExceptFailure-8                                	 2000000	       897 ns/op	     464 B/op	      10 allocs/op
+BenchmarkStructExceptFailure-8                                	 2000000	       875 ns/op
-BenchmarkStructExceptFailureParallel-8                        	 5000000	       394 ns/op	     464 B/op	      10 allocs/op
+BenchmarkStructExceptFailureParallel-8                        	 5000000	       405 ns/op
-BenchmarkStructSimpleCrossFieldSuccess-8                      	 3000000	       535 ns/op	      72 B/op	       3 allocs/op
+BenchmarkStructSimpleCrossFieldSuccess-8                      	 3000000	       545 ns/op
-BenchmarkStructSimpleCrossFieldSuccessParallel-8              	10000000	       184 ns/op	      72 B/op	       3 allocs/op
+BenchmarkStructSimpleCrossFieldSuccessParallel-8              	10000000	       177 ns/op
-BenchmarkStructSimpleCrossFieldFailure-8                      	 2000000	       789 ns/op	     304 B/op	       8 allocs/op
+BenchmarkStructSimpleCrossFieldFailure-8                      	 2000000	       787 ns/op
-BenchmarkStructSimpleCrossFieldFailureParallel-8              	 5000000	       386 ns/op	     304 B/op	       8 allocs/op
+BenchmarkStructSimpleCrossFieldFailureParallel-8              	 5000000	       341 ns/op
-BenchmarkStructSimpleCrossStructCrossFieldSuccess-8           	 2000000	       793 ns/op	      80 B/op	       4 allocs/op
+BenchmarkStructSimpleCrossStructCrossFieldSuccess-8           	 2000000	       795 ns/op
-BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8   	 5000000	       287 ns/op	      80 B/op	       4 allocs/op
+BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8   	10000000	       267 ns/op
-BenchmarkStructSimpleCrossStructCrossFieldFailure-8           	 1000000	      1065 ns/op	     320 B/op	       9 allocs/op
+BenchmarkStructSimpleCrossStructCrossFieldFailure-8           	 1000000	      1119 ns/op
-BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8   	 3000000	       417 ns/op	     320 B/op	       9 allocs/op
+BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8   	 3000000	       437 ns/op
-BenchmarkStructSimpleSuccess-8                                	 5000000	       364 ns/op	       0 B/op	       0 allocs/op
+BenchmarkStructSimpleSuccess-8                                	 5000000	       377 ns/op
-BenchmarkStructSimpleSuccessParallel-8                        	20000000	       112 ns/op	       0 B/op	       0 allocs/op
+BenchmarkStructSimpleSuccessParallel-8                        	20000000	       110 ns/op
-BenchmarkStructSimpleFailure-8                                	 2000000	       785 ns/op	     424 B/op	       9 allocs/op
+BenchmarkStructSimpleFailure-8                                	 2000000	       785 ns/op
-BenchmarkStructSimpleFailureParallel-8                        	 5000000	       339 ns/op	     424 B/op	       9 allocs/op
+BenchmarkStructSimpleFailureParallel-8                        	 5000000	       302 ns/op
-BenchmarkStructComplexSuccess-8                               	 1000000	      2136 ns/op	     128 B/op	       8 allocs/op
+BenchmarkStructComplexSuccess-8                               	 1000000	      2159 ns/op
-BenchmarkStructComplexSuccessParallel-8                       	 2000000	       755 ns/op	     128 B/op	       8 allocs/op
+BenchmarkStructComplexSuccessParallel-8                       	 2000000	       723 ns/op
-BenchmarkStructComplexFailure-8                               	  300000	      5248 ns/op	    3041 B/op	      53 allocs/op
+BenchmarkStructComplexFailure-8                               	  300000	      5237 ns/op
-BenchmarkStructComplexFailureParallel-8                       	 1000000	      2363 ns/op	    3041 B/op	      53 allocs/op
+BenchmarkStructComplexFailureParallel-8                       	 1000000	      2378 ns/op
 ```
 
 Complimentary Software

baked_in.go

@@ -26,6 +26,7 @@ var (
 		utf8HexComma:      {},
 		utf8Pipe:          {},
 		noStructLevelTag:  {},
+		requiredTag:       {},
 	}
 
 	// BakedInAliasValidators is a default mapping of a single validation tag that
@@ -887,6 +888,11 @@ func hasValue(fl FieldLevel) bool {
 	case reflect.Slice, reflect.Map, reflect.Ptr, reflect.Interface, reflect.Chan, reflect.Func:
 		return !field.IsNil()
 	default:
+
+		if fl.(*validate).fldIsPointer && field.Interface() != nil {
+			return true
+		}
+
 		return field.IsValid() && field.Interface() != reflect.Zero(field.Type()).Interface()
 	}
 }

validator.go

@@ -24,6 +24,7 @@ type validate struct {
 	slCurrent    reflect.Value
 	flField      reflect.Value
 	flParam      string
+	fldIsPointer bool
 
 	// misc reusable values
 	misc []byte
@@ -95,9 +96,8 @@ func (v *validate) traverseField(parent reflect.Value, current reflect.Value, ns
 
 	var typ reflect.Type
 	var kind reflect.Kind
-	var nullable bool
 
-	current, kind, nullable = v.extractTypeInternal(current, nullable)
+	current, kind, v.fldIsPointer = v.extractTypeInternal(current, false)
 
 	switch kind {
 	case reflect.Ptr, reflect.Interface, reflect.Invalid:
@@ -207,7 +207,7 @@ OUTER:
 			v.flField = current
 			v.flParam = ""
 
-			if !nullable && !hasValue(v) {
+			if !v.fldIsPointer && !hasValue(v) {
 				return
 			}
 

validator_instance.go

@@ -23,6 +23,7 @@ const (
 	omitempty          = "omitempty"
 	skipValidationTag  = "-"
 	diveTag            = "dive"
+	requiredTag        = "required"
 	namespaceSeparator = "."
 	leftBracket        = "["
 	rightBracket       = "]"
@@ -92,7 +93,7 @@ func New() *Validate {
 	for k, val := range bakedInValidators {
 
 		// no need to error check here, baked in will alwaays be valid
-		v.RegisterValidation(k, val)
+		v.registerValidation(k, val, true)
 	}
 
 	v.pool = &sync.Pool{
@@ -127,6 +128,10 @@ func (v *Validate) RegisterTagNameFunc(fn TagNameFunc) {
 // - if the key already exists, the previous validation function will be replaced.
 // - this method is not thread-safe it is intended that these all be registered prior to any validation
 func (v *Validate) RegisterValidation(tag string, fn Func) error {
+	return v.registerValidation(tag, fn, false)
+}
+
+func (v *Validate) registerValidation(tag string, fn Func, bakedIn bool) error {
 
 	if len(tag) == 0 {
 		return errors.New("Function Key cannot be empty")
@@ -138,7 +143,7 @@ func (v *Validate) RegisterValidation(tag string, fn Func) error {
 
 	_, ok := restrictedTags[tag]
 
-	if ok || strings.ContainsAny(tag, restrictedTagChars) {
+	if !bakedIn && (ok || strings.ContainsAny(tag, restrictedTagChars)) {
 		panic(fmt.Sprintf(restrictedTagErr, tag))
 	}
 

validator_test.go

@@ -6731,3 +6731,96 @@ func TestStructFiltered(t *testing.T) {
 	NotEqual(t, err, nil)
 	Equal(t, err.Error(), "validator: (nil *time.Time)")
 }
+
+func TestRequiredPtr(t *testing.T) {
+
+	type Test struct {
+		Bool *bool `validate:"required"`
+	}
+
+	validate := New()
+
+	f := false
+
+	test := Test{
+		Bool: &f,
+	}
+
+	err := validate.Struct(test)
+	Equal(t, err, nil)
+
+	tr := true
+
+	test.Bool = &tr
+
+	err = validate.Struct(test)
+	Equal(t, err, nil)
+
+	test.Bool = nil
+
+	err = validate.Struct(test)
+	NotEqual(t, err, nil)
+
+	errs, ok := err.(ValidationErrors)
+	Equal(t, ok, true)
+	Equal(t, len(errs), 1)
+	AssertError(t, errs, "Test.Bool", "Test.Bool", "Bool", "Bool", "required")
+
+	type Test2 struct {
+		Bool bool `validate:"required"`
+	}
+
+	var test2 Test2
+
+	err = validate.Struct(test2)
+	NotEqual(t, err, nil)
+
+	errs, ok = err.(ValidationErrors)
+	Equal(t, ok, true)
+	Equal(t, len(errs), 1)
+	AssertError(t, errs, "Test2.Bool", "Test2.Bool", "Bool", "Bool", "required")
+
+	test2.Bool = true
+
+	err = validate.Struct(test2)
+	Equal(t, err, nil)
+
+	type Test3 struct {
+		Arr []string `validate:"required"`
+	}
+
+	var test3 Test3
+
+	err = validate.Struct(test3)
+	NotEqual(t, err, nil)
+
+	errs, ok = err.(ValidationErrors)
+	Equal(t, ok, true)
+	Equal(t, len(errs), 1)
+	AssertError(t, errs, "Test3.Arr", "Test3.Arr", "Arr", "Arr", "required")
+
+	test3.Arr = make([]string, 0)
+
+	err = validate.Struct(test3)
+	Equal(t, err, nil)
+
+	type Test4 struct {
+		Arr *[]string `validate:"required"` // I know I know pointer to array, just making sure validation works as expected...
+	}
+
+	var test4 Test4
+
+	err = validate.Struct(test4)
+	NotEqual(t, err, nil)
+
+	errs, ok = err.(ValidationErrors)
+	Equal(t, ok, true)
+	Equal(t, len(errs), 1)
+	AssertError(t, errs, "Test4.Arr", "Test4.Arr", "Arr", "Arr", "required")
+
+	arr := make([]string, 0)
+	test4.Arr = &arr
+
+	err = validate.Struct(test4)
+	Equal(t, err, nil)
+}