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minio/pkg/policy/condition/stringequalsfunc.go

182 lines
5.3 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"
"sort"
"strings"
"github.com/minio/minio-go/pkg/set"
)
func toStringEqualsFuncString(n name, key Key, values set.StringSet) string {
valueStrings := values.ToSlice()
sort.Strings(valueStrings)
return fmt.Sprintf("%v:%v:%v", n, key, valueStrings)
}
// stringEqualsFunc - String equals function. It checks whether value by Key in given
// values map is in condition values.
// For example,
// - if values = ["mybucket/foo"], at evaluate() it returns whether string
// in value map for Key is in values.
type stringEqualsFunc struct {
k Key
values set.StringSet
}
// evaluate() - evaluates to check whether value by Key in given values is in
// condition values.
func (f stringEqualsFunc) evaluate(values map[string][]string) bool {
requestValue := values[f.k.Name()]
return !f.values.Intersection(set.CreateStringSet(requestValue...)).IsEmpty()
}
// key() - returns condition key which is used by this condition function.
func (f stringEqualsFunc) key() Key {
return f.k
}
// name() - returns "StringEquals" condition name.
func (f stringEqualsFunc) name() name {
return stringEquals
}
func (f stringEqualsFunc) String() string {
return toStringEqualsFuncString(stringEquals, f.k, f.values)
}
// toMap - returns map representation of this function.
func (f stringEqualsFunc) toMap() map[Key]ValueSet {
if !f.k.IsValid() {
return nil
}
values := NewValueSet()
for _, value := range f.values.ToSlice() {
values.Add(NewStringValue(value))
}
return map[Key]ValueSet{
f.k: values,
}
}
// stringNotEqualsFunc - String not equals function. It checks whether value by Key in
// given values is NOT in condition values.
// For example,
// - if values = ["mybucket/foo"], at evaluate() it returns whether string
// in value map for Key is NOT in values.
type stringNotEqualsFunc struct {
stringEqualsFunc
}
// evaluate() - evaluates to check whether value by Key in given values is NOT in
// condition values.
func (f stringNotEqualsFunc) evaluate(values map[string][]string) bool {
return !f.stringEqualsFunc.evaluate(values)
}
// name() - returns "StringNotEquals" condition name.
func (f stringNotEqualsFunc) name() name {
return stringNotEquals
}
func (f stringNotEqualsFunc) String() string {
return toStringEqualsFuncString(stringNotEquals, f.stringEqualsFunc.k, f.stringEqualsFunc.values)
}
func valuesToStringSlice(n name, values ValueSet) ([]string, error) {
valueStrings := []string{}
for value := range values {
// FIXME: if AWS supports non-string values, we would need to support it.
s, err := value.GetString()
if err != nil {
return nil, fmt.Errorf("value must be a string for %v condition", n)
}
valueStrings = append(valueStrings, s)
}
return valueStrings, nil
}
func validateStringEqualsValues(n name, key Key, values set.StringSet) error {
for _, s := range values.ToSlice() {
switch key {
case S3XAmzCopySource:
tokens := strings.SplitN(s, "/", 2)
if len(tokens) < 2 {
return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzCopySource, n)
}
// FIXME: tokens[0] must be a valid bucket name.
case S3XAmzServerSideEncryption:
if s != "aws:kms" && s != "AES256" {
return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzServerSideEncryption, n)
}
case S3XAmzMetadataDirective:
if s != "COPY" && s != "REPLACE" {
return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzMetadataDirective, n)
}
}
}
return nil
}
// newStringEqualsFunc - returns new StringEquals function.
func newStringEqualsFunc(key Key, values ValueSet) (Function, error) {
valueStrings, err := valuesToStringSlice(stringEquals, values)
if err != nil {
return nil, err
}
return NewStringEqualsFunc(key, valueStrings...)
}
// NewStringEqualsFunc - returns new StringEquals function.
func NewStringEqualsFunc(key Key, values ...string) (Function, error) {
sset := set.CreateStringSet(values...)
if err := validateStringEqualsValues(stringEquals, key, sset); err != nil {
return nil, err
}
return &stringEqualsFunc{key, sset}, nil
}
// newStringNotEqualsFunc - returns new StringNotEquals function.
func newStringNotEqualsFunc(key Key, values ValueSet) (Function, error) {
valueStrings, err := valuesToStringSlice(stringNotEquals, values)
if err != nil {
return nil, err
}
return NewStringNotEqualsFunc(key, valueStrings...)
}
// NewStringNotEqualsFunc - returns new StringNotEquals function.
func NewStringNotEqualsFunc(key Key, values ...string) (Function, error) {
sset := set.CreateStringSet(values...)
if err := validateStringEqualsValues(stringNotEquals, key, sset); err != nil {
return nil, err
}
return &stringNotEqualsFunc{stringEqualsFunc{key, sset}}, nil
}