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