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|
package validator
import (
"reflect"
"fmt"
"github.com/vektah/gqlparser/ast"
"github.com/vektah/gqlparser/gqlerror"
)
var UnexpectedType = fmt.Errorf("Unexpected Type")
// VariableValues coerces and validates variable values
func VariableValues(schema *ast.Schema, op *ast.OperationDefinition, variables map[string]interface{}) (map[string]interface{}, *gqlerror.Error) {
coercedVars := map[string]interface{}{}
validator := varValidator{
path: []interface{}{"variable"},
schema: schema,
}
for _, v := range op.VariableDefinitions {
validator.path = append(validator.path, v.Variable)
if !v.Definition.IsInputType() {
return nil, gqlerror.ErrorPathf(validator.path, "must an input type")
}
val, hasValue := variables[v.Variable]
if !hasValue {
if v.DefaultValue != nil {
var err error
val, err = v.DefaultValue.Value(nil)
if err != nil {
return nil, gqlerror.WrapPath(validator.path, err)
}
hasValue = true
} else if v.Type.NonNull {
return nil, gqlerror.ErrorPathf(validator.path, "must be defined")
}
}
if hasValue {
if val == nil {
if v.Type.NonNull {
return nil, gqlerror.ErrorPathf(validator.path, "cannot be null")
}
coercedVars[v.Variable] = nil
} else {
rv := reflect.ValueOf(val)
if rv.Kind() == reflect.Ptr || rv.Kind() == reflect.Interface {
rv = rv.Elem()
}
if err := validator.validateVarType(v.Type, rv); err != nil {
return nil, err
}
coercedVars[v.Variable] = val
}
}
validator.path = validator.path[0 : len(validator.path)-1]
}
return coercedVars, nil
}
type varValidator struct {
path []interface{}
schema *ast.Schema
}
func (v *varValidator) validateVarType(typ *ast.Type, val reflect.Value) *gqlerror.Error {
if typ.Elem != nil {
if val.Kind() != reflect.Slice {
return gqlerror.ErrorPathf(v.path, "must be an array")
}
for i := 0; i < val.Len(); i++ {
v.path = append(v.path, i)
field := val.Index(i)
if field.Kind() == reflect.Ptr || field.Kind() == reflect.Interface {
if typ.Elem.NonNull && field.IsNil() {
return gqlerror.ErrorPathf(v.path, "cannot be null")
}
field = field.Elem()
}
if err := v.validateVarType(typ.Elem, field); err != nil {
return err
}
v.path = v.path[0 : len(v.path)-1]
}
return nil
}
def := v.schema.Types[typ.NamedType]
if def == nil {
panic(fmt.Errorf("missing def for %s", typ.NamedType))
}
switch def.Kind {
case ast.Enum:
kind := val.Type().Kind()
if kind == reflect.Int || kind == reflect.Int32 || kind == reflect.Int64 || kind == reflect.String {
return nil
}
return gqlerror.ErrorPathf(v.path, "enums must be ints or strings")
case ast.Scalar:
kind := val.Type().Kind()
switch typ.NamedType {
case "Int":
if kind == reflect.String || kind == reflect.Int || kind == reflect.Int32 || kind == reflect.Int64 {
return nil
}
case "Float":
if kind == reflect.String || kind == reflect.Float32 || kind == reflect.Float64 || kind == reflect.Int || kind == reflect.Int32 || kind == reflect.Int64 {
return nil
}
case "String":
if kind == reflect.String {
return nil
}
case "Boolean":
if kind == reflect.Bool {
return nil
}
case "ID":
if kind == reflect.Int || kind == reflect.Int32 || kind == reflect.Int64 || kind == reflect.String {
return nil
}
default:
// assume custom scalars are ok
return nil
}
return gqlerror.ErrorPathf(v.path, "cannot use %s as %s", kind.String(), typ.NamedType)
case ast.InputObject:
if val.Kind() != reflect.Map {
return gqlerror.ErrorPathf(v.path, "must be a %s", def.Name)
}
// check for unknown fields
for _, name := range val.MapKeys() {
val.MapIndex(name)
fieldDef := def.Fields.ForName(name.String())
v.path = append(v.path, name)
if fieldDef == nil {
return gqlerror.ErrorPathf(v.path, "unknown field")
}
v.path = v.path[0 : len(v.path)-1]
}
for _, fieldDef := range def.Fields {
v.path = append(v.path, fieldDef.Name)
field := val.MapIndex(reflect.ValueOf(fieldDef.Name))
if !field.IsValid() {
if fieldDef.Type.NonNull {
return gqlerror.ErrorPathf(v.path, "must be defined")
}
continue
}
if field.Kind() == reflect.Ptr || field.Kind() == reflect.Interface {
if fieldDef.Type.NonNull && field.IsNil() {
return gqlerror.ErrorPathf(v.path, "cannot be null")
}
//allow null object field and skip it
if !fieldDef.Type.NonNull && field.IsNil() {
continue
}
field = field.Elem()
}
err := v.validateVarType(fieldDef.Type, field)
if err != nil {
return err
}
v.path = v.path[0 : len(v.path)-1]
}
default:
panic(fmt.Errorf("unsupported type %s", def.Kind))
}
return nil
}
|
