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minio/pkg/policy/condition/stringlikefunc.go

172 lines
4.8 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"
"sort"
"github.com/minio/minio-go/pkg/s3utils"
"github.com/minio/minio-go/pkg/set"
"github.com/minio/minio/pkg/wildcard"
)
func toStringLikeFuncString(n name, key Key, values set.StringSet) string {
valueStrings := values.ToSlice()
sort.Strings(valueStrings)
return fmt.Sprintf("%v:%v:%v", n, key, valueStrings)
}
// stringLikeFunc - String like function. It checks whether value by Key in given
// values map is widcard matching in condition values.
// For example,
// - if values = ["mybucket/foo*"], at evaluate() it returns whether string
// in value map for Key is wildcard matching in values.
type stringLikeFunc struct {
k Key
values set.StringSet
}
// evaluate() - evaluates to check whether value by Key in given values is wildcard
// matching in condition values.
func (f stringLikeFunc) evaluate(values map[string][]string) bool {
requestValue, ok := values[http.CanonicalHeaderKey(f.k.Name())]
if !ok {
requestValue = values[f.k.Name()]
}
for _, v := range requestValue {
if !f.values.FuncMatch(wildcard.Match, v).IsEmpty() {
return true
}
}
return false
}
// key() - returns condition key which is used by this condition function.
func (f stringLikeFunc) key() Key {
return f.k
}
// name() - returns "StringLike" function name.
func (f stringLikeFunc) name() name {
return stringLike
}
func (f stringLikeFunc) String() string {
return toStringLikeFuncString(stringLike, f.k, f.values)
}
// toMap - returns map representation of this function.
func (f stringLikeFunc) 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,
}
}
// stringNotLikeFunc - String not like function. It checks whether value by Key in given
// values map is NOT widcard matching in condition values.
// For example,
// - if values = ["mybucket/foo*"], at evaluate() it returns whether string
// in value map for Key is NOT wildcard matching in values.
type stringNotLikeFunc struct {
stringLikeFunc
}
// evaluate() - evaluates to check whether value by Key in given values is NOT wildcard
// matching in condition values.
func (f stringNotLikeFunc) evaluate(values map[string][]string) bool {
return !f.stringLikeFunc.evaluate(values)
}
// name() - returns "StringNotLike" function name.
func (f stringNotLikeFunc) name() name {
return stringNotLike
}
func (f stringNotLikeFunc) String() string {
return toStringLikeFuncString(stringNotLike, f.stringLikeFunc.k, f.stringLikeFunc.values)
}
func validateStringLikeValues(n name, key Key, values set.StringSet) error {
for _, s := range values.ToSlice() {
switch key {
case S3XAmzCopySource:
bucket, object := path2BucketAndObject(s)
if object == "" {
return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzCopySource, n)
}
if err := s3utils.CheckValidBucketName(bucket); err != nil {
return err
}
}
}
return nil
}
// newStringLikeFunc - returns new StringLike function.
func newStringLikeFunc(key Key, values ValueSet) (Function, error) {
valueStrings, err := valuesToStringSlice(stringLike, values)
if err != nil {
return nil, err
}
return NewStringLikeFunc(key, valueStrings...)
}
// NewStringLikeFunc - returns new StringLike function.
func NewStringLikeFunc(key Key, values ...string) (Function, error) {
sset := set.CreateStringSet(values...)
if err := validateStringLikeValues(stringLike, key, sset); err != nil {
return nil, err
}
return &stringLikeFunc{key, sset}, nil
}
// newStringNotLikeFunc - returns new StringNotLike function.
func newStringNotLikeFunc(key Key, values ValueSet) (Function, error) {
valueStrings, err := valuesToStringSlice(stringNotLike, values)
if err != nil {
return nil, err
}
return NewStringNotLikeFunc(key, valueStrings...)
}
// NewStringNotLikeFunc - returns new StringNotLike function.
func NewStringNotLikeFunc(key Key, values ...string) (Function, error) {
sset := set.CreateStringSet(values...)
if err := validateStringLikeValues(stringNotLike, key, sset); err != nil {
return nil, err
}
return &stringNotLikeFunc{stringLikeFunc{key, sset}}, nil
}