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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package condition
import (
"fmt"
"reflect"
"strconv"
)
// nullFunc - Null condition function. It checks whether Key is not present in given
// values or not.
// For example,
// 1. if Key = S3XAmzCopySource and Value = true, at evaluate() it returns whether
// S3XAmzCopySource is NOT in given value map or not.
// 2. if Key = S3XAmzCopySource and Value = false, at evaluate() it returns whether
// S3XAmzCopySource is in given value map or not.
//
// https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition_operators.html#Conditions_Null
type nullFunc struct {
k Key
value bool
}
// evaluate() - evaluates to check whether Key is present in given values or not.
// Depending on condition boolean value, this function returns true or false.
func (f nullFunc) evaluate(values map[string][]string) bool {
rvalues := getValuesByKey(values, f.k)
if f.value {
return len(rvalues) == 0
}
return len(rvalues) != 0
}
// key() - returns condition key which is used by this condition function.
func (f nullFunc) key() Key {
return f.k
}
// name() - returns "Null" condition name.
func (f nullFunc) name() name {
return name{name: null}
}
func (f nullFunc) String() string {
return fmt.Sprintf("%v:%v:%v", null, f.k, f.value)
}
// toMap - returns map representation of this function.
func (f nullFunc) toMap() map[Key]ValueSet {
if !f.k.IsValid() {
return nil
}
return map[Key]ValueSet{
f.k: NewValueSet(NewBoolValue(f.value)),
}
}
func (f nullFunc) clone() Function {
return &nullFunc{
k: f.k,
value: f.value,
}
}
func newNullFunc(key Key, values ValueSet, _ string) (Function, error) {
if len(values) != 1 {
return nil, fmt.Errorf("only one value is allowed for Null condition")
}
var value bool
for v := range values {
switch v.GetType() {
case reflect.Bool:
value, _ = v.GetBool()
case reflect.String:
var err error
s, _ := v.GetString()
if value, err = strconv.ParseBool(s); err != nil {
return nil, fmt.Errorf("value must be a boolean string for Null condition")
}
default:
return nil, fmt.Errorf("value must be a boolean for Null condition")
}
}
return &nullFunc{key, value}, nil
}
// NewNullFunc - returns new Null function.
func NewNullFunc(key Key, value bool) (Function, error) {
return newNullFunc(key, NewValueSet(NewBoolValue(value)), "")
}
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