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minio/pkg/bucket/policy/condition/boolfunc.go

109 lines
2.8 KiB

/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* 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 condition
import (
"fmt"
"net/http"
"reflect"
"strconv"
)
// booleanFunc - Bool condition function. It checks whether Key is true or false.
// https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition_operators.html#Conditions_Boolean
type booleanFunc struct {
k Key
value string
}
// 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 booleanFunc) evaluate(values map[string][]string) bool {
requestValue, ok := values[http.CanonicalHeaderKey(f.k.Name())]
if !ok {
requestValue = values[f.k.Name()]
}
if len(requestValue) == 0 {
return false
}
return f.value == requestValue[0]
}
// key() - returns condition key which is used by this condition function.
func (f booleanFunc) key() Key {
return f.k
}
// name() - returns "Bool" condition name.
func (f booleanFunc) name() name {
return boolean
}
func (f booleanFunc) String() string {
return fmt.Sprintf("%v:%v:%v", boolean, f.k, f.value)
}
// toMap - returns map representation of this function.
func (f booleanFunc) toMap() map[Key]ValueSet {
if !f.k.IsValid() {
return nil
}
return map[Key]ValueSet{
f.k: NewValueSet(NewStringValue(f.value)),
}
}
func newBooleanFunc(key Key, values ValueSet) (Function, error) {
if key != AWSSecureTransport {
return nil, fmt.Errorf("only %v key is allowed for %v condition", AWSSecureTransport, boolean)
}
if len(values) != 1 {
return nil, fmt.Errorf("only one value is allowed for boolean condition")
}
var value Value
for v := range values {
value = v
switch v.GetType() {
case reflect.Bool:
if _, err := v.GetBool(); err != nil {
return nil, err
}
case reflect.String:
s, err := v.GetString()
if err != nil {
return nil, err
}
if _, err = strconv.ParseBool(s); err != nil {
return nil, fmt.Errorf("value must be a boolean string for boolean condition")
}
default:
return nil, fmt.Errorf("value must be a boolean for boolean condition")
}
}
return &booleanFunc{key, value.String()}, nil
}
// NewBoolFunc - returns new Bool function.
func NewBoolFunc(key Key, value string) (Function, error) {
return &booleanFunc{key, value}, nil
}