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in.go
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in.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package validate
import (
"fmt"
"reflect"
"go.thethings.network/lorawan-stack/pkg/errors"
)
var (
errNoSliceOrArray = errors.DefineInvalidArgument("no_slice_or_array", "must be slice or array, is `{type}`")
errNotPresent = errors.DefineInvalidArgument("not_present", "`{value}` is not present in `{allowed_values}`")
errNotSubset = errors.DefineInvalidArgument("not_subset", "`{value}` is not a subset of `{reference}`")
)
// In checks whether:
// - an element is contained in an array or slice
// - a slice is a subset of other slice
func In(slice interface{}) validateFn { // nolint: golint, returns unexported type on purpose
return func(v interface{}) error {
sliceVal := reflect.ValueOf(slice)
if sliceVal.Kind() != reflect.Slice && sliceVal.Kind() != reflect.Array {
return errNoSliceOrArray.WithAttributes("type", fmt.Sprintf("%T", v))
}
fn := func(v interface{}, slice reflect.Value) error {
var found bool
for i := 0; i < slice.Len() && !found; i++ {
found = reflect.DeepEqual(v, slice.Index(i).Interface())
}
if !found {
return errNotPresent.WithAttributes("value", fmt.Sprintf("%v", v), "allowed_values", fmt.Sprintf("%v", slice))
}
return nil
}
val := reflect.ValueOf(v)
if val.Kind() == reflect.Slice || val.Kind() == reflect.Array {
if val.Len() > sliceVal.Len() {
return errNotSubset.WithAttributes("value", fmt.Sprintf("%v", v), "reference", fmt.Sprintf("%v", slice))
}
for i := 0; i < val.Len(); i++ {
err := fn(val.Index(i).Interface(), sliceVal)
if err != nil {
return err
}
}
} else {
return fn(v, sliceVal)
}
return nil
}
}