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

144 lines
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/*
* 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 (
"encoding/base64"
"fmt"
"net/http"
"sort"
"github.com/minio/minio-go/v7/pkg/s3utils"
"github.com/minio/minio-go/v7/pkg/set"
)
func toBinaryEqualsFuncString(n name, key Key, values set.StringSet) string {
valueStrings := values.ToSlice()
sort.Strings(valueStrings)
return fmt.Sprintf("%v:%v:%v", n, key, valueStrings)
}
// binaryEqualsFunc - 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 binaryEqualsFunc struct {
k Key
values set.StringSet
}
// evaluate() - evaluates to check whether value by Key in given values is in
// condition values.
func (f binaryEqualsFunc) evaluate(values map[string][]string) bool {
requestValue, ok := values[http.CanonicalHeaderKey(f.k.Name())]
if !ok {
requestValue = values[f.k.Name()]
}
fvalues := f.values.ApplyFunc(substFuncFromValues(values))
return !fvalues.Intersection(set.CreateStringSet(requestValue...)).IsEmpty()
}
// key() - returns condition key which is used by this condition function.
func (f binaryEqualsFunc) key() Key {
return f.k
}
// name() - returns "BinaryEquals" condition name.
func (f binaryEqualsFunc) name() name {
return binaryEquals
}
func (f binaryEqualsFunc) String() string {
return toBinaryEqualsFuncString(binaryEquals, f.k, f.values)
}
// toMap - returns map representation of this function.
func (f binaryEqualsFunc) toMap() map[Key]ValueSet {
if !f.k.IsValid() {
return nil
}
values := NewValueSet()
for _, value := range f.values.ToSlice() {
values.Add(NewStringValue(base64.StdEncoding.EncodeToString([]byte(value))))
}
return map[Key]ValueSet{
f.k: values,
}
}
func validateBinaryEqualsValues(n name, key Key, values set.StringSet) error {
vslice := values.ToSlice()
for _, s := range vslice {
sbytes, err := base64.StdEncoding.DecodeString(s)
if err != nil {
return err
}
values.Remove(s)
s = string(sbytes)
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
}
case S3XAmzServerSideEncryption, S3XAmzServerSideEncryptionCustomerAlgorithm:
if 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)
}
case S3XAmzContentSha256:
if s == "" {
return fmt.Errorf("invalid empty value for '%v' for %v condition", S3XAmzContentSha256, n)
}
}
values.Add(s)
}
return nil
}
// newBinaryEqualsFunc - returns new BinaryEquals function.
func newBinaryEqualsFunc(key Key, values ValueSet) (Function, error) {
valueStrings, err := valuesToStringSlice(binaryEquals, values)
if err != nil {
return nil, err
}
return NewBinaryEqualsFunc(key, valueStrings...)
}
// NewBinaryEqualsFunc - returns new BinaryEquals function.
func NewBinaryEqualsFunc(key Key, values ...string) (Function, error) {
sset := set.CreateStringSet(values...)
if err := validateBinaryEqualsValues(binaryEquals, key, sset); err != nil {
return nil, err
}
return &binaryEqualsFunc{key, sset}, nil
}