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Fix coercion of typedef primitives and their pointers #489

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Fix coercion of typedef primitives and their pointers #489

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107 changes: 99 additions & 8 deletions scalars.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,12 +3,79 @@ package graphql
import (
"fmt"
"math"
"reflect"
"strconv"
"time"

"github.com/graphql-go/graphql/language/ast"
)

func unwrapInt(value interface{}) (interface{}, bool) {
r := reflect.Indirect(reflect.ValueOf(value))
if !r.IsValid() || (r.Kind() == reflect.Ptr && r.IsNil()) {
return nil, false
}

switch r.Kind() {
case reflect.Int:
return int(r.Int()), true
case reflect.Int8:
return int8(r.Int()), true
case reflect.Int16:
return int16(r.Int()), true
case reflect.Int32:
return int32(r.Int()), true
case reflect.Int64:
return r.Int(), true
default:
return nil, false
}
}

func unwrapFloat(value interface{}) (interface{}, bool) {
r := reflect.Indirect(reflect.ValueOf(value))
if !r.IsValid() || (r.Kind() == reflect.Ptr && r.IsNil()) {
return nil, false
}

switch r.Kind() {
case reflect.Float32:
return float32(r.Float()), true
case reflect.Float64:
return r.Float(), true
default:
return nil, false
}
}

func unwrapBool(value interface{}) (interface{}, bool) {
r := reflect.Indirect(reflect.ValueOf(value))
if !r.IsValid() || (r.Kind() == reflect.Ptr && r.IsNil()) {
return nil, false
}

switch r.Kind() {
case reflect.Bool:
return r.Bool(), true
default:
return nil, false
}
}

func unwrapString(value interface{}) (interface{}, bool) {
r := reflect.Indirect(reflect.ValueOf(value))
if !r.IsValid() || (r.Kind() == reflect.Ptr && r.IsNil()) {
return nil, false
}

switch r.Kind() {
case reflect.String:
return r.String(), true
default:
return nil, false
}
}

// As per the GraphQL Spec, Integers are only treated as valid when a valid
// 32-bit signed integer, providing the broadest support across platforms.
//
Expand Down Expand Up @@ -142,11 +209,14 @@ func coerceInt(value interface{}) interface{} {
return nil
}
return coerceInt(*value)
default:
if v, ok := unwrapInt(value); ok {
return coerceInt(v)
}
// If the value cannot be transformed into an int, return nil instead of '0'
// to denote 'no integer found'
return nil
}

// If the value cannot be transformed into an int, return nil instead of '0'
// to denote 'no integer found'
return nil
}

// Int is the GraphQL Integer type definition.
Expand Down Expand Up @@ -276,6 +346,10 @@ func coerceFloat(value interface{}) interface{} {
return coerceFloat(*value)
}

if v, ok := unwrapFloat(value); ok {
return coerceFloat(v)
}

// If the value cannot be transformed into an float, return nil instead of '0.0'
// to denote 'no float found'
return nil
Expand Down Expand Up @@ -305,13 +379,23 @@ var Float = NewScalar(ScalarConfig{
})

func coerceString(value interface{}) interface{} {
if v, ok := value.(*string); ok {
if v == nil {
switch t := value.(type) {
case *string:
if t == nil {
return nil
}
return *v
return *t
case string:
return t
default:
if v, ok := unwrapString(value); ok {
return coerceString(v)
}
if r := reflect.ValueOf(value); r.Kind() == reflect.Ptr && r.IsNil() {
return nil
}
return fmt.Sprintf("%v", value)
}
return fmt.Sprintf("%v", value)
}

// String is the GraphQL string type definition
Expand Down Expand Up @@ -472,6 +556,13 @@ func coerceBool(value interface{}) interface{} {
}
return coerceBool(*value)
}

if v, ok := unwrapBool(value); ok {
return coerceBool(v)
}
if r := reflect.ValueOf(value); r.Kind() == reflect.Ptr && r.IsNil() {
return nil
}
return false
}

Expand Down
95 changes: 92 additions & 3 deletions scalars_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,50 @@ import (
"testing"
)

type (
myInt int
myString string
myBool bool
myFloat32 float32
)

func TestCoerceString(t *testing.T) {
tests := []struct {
in interface{}
want interface{}
}{
{
in: "hello",
want: "hello",
},
{
in: func() interface{} { s := "hello"; return &s }(),
want: "hello",
},
// Typedef
{
in: myString("hello"),
want: "hello",
},
// Typedef with pointer
{
in: func() interface{} { v := myString("hello"); return &v }(),
want: "hello",
},
// Typedef with nil pointer
{
in: (*myString)(nil),
want: nil,
},
}

for i, tt := range tests {
if got, want := coerceString(tt.in), tt.want; got != want {
t.Errorf("%d: in=%#v, got=%#v, want=%#v", i, tt.in, got, want)
}
}
}

func TestCoerceInt(t *testing.T) {
tests := []struct {
in interface{}
Expand Down Expand Up @@ -240,11 +284,26 @@ func TestCoerceInt(t *testing.T) {
in: make(map[string]interface{}),
want: nil,
},
// Typedef
{
in: myInt(42),
want: int(42),
},
// Typedef with pointer
{
in: func() interface{} { v := myInt(42); return &v }(),
want: int(42),
},
// Typedef with nil pointer
{
in: (*myInt)(nil),
want: nil,
},
}

for i, tt := range tests {
if got, want := coerceInt(tt.in), tt.want; got != want {
t.Errorf("%d: in=%v, got=%v, want=%v", i, tt.in, got, want)
t.Errorf("%d: in=%#v, got=%#v, want=%#v", i, tt.in, got, want)
}
}
}
Expand Down Expand Up @@ -438,11 +497,26 @@ func TestCoerceFloat(t *testing.T) {
in: make(map[string]interface{}),
want: nil,
},
// Typedef
{
in: myFloat32(3.14),
want: float32(3.14),
},
// Typedef with pointer
{
in: func() interface{} { v := myFloat32(3.14); return &v }(),
want: float32(3.14),
},
// Typedef with nil pointer
{
in: (*myFloat32)(nil),
want: nil,
},
}

for i, tt := range tests {
if got, want := coerceFloat(tt.in), tt.want; got != want {
t.Errorf("%d: in=%v, got=%v, want=%v", i, tt.in, got, want)
t.Errorf("%d: in=%#v, got=%#v, want=%#v", i, tt.in, got, want)
}
}
}
Expand Down Expand Up @@ -740,11 +814,26 @@ func TestCoerceBool(t *testing.T) {
in: make(map[string]interface{}),
want: false,
},
// Typedef
{
in: myBool(true),
want: true,
},
// Typedef with pointer
{
in: func() interface{} { v := myBool(true); return &v }(),
want: true,
},
// Typedef with nil pointer
{
in: (*myBool)(nil),
want: nil,
},
}

for i, tt := range tests {
if got, want := coerceBool(tt.in), tt.want; got != want {
t.Errorf("%d: in=%v, got=%v, want=%v", i, tt.in, got, want)
t.Errorf("%d: in=%#v, got=%#v, want=%#v", i, tt.in, got, want)
}
}
}
Expand Down