mirror of https://github.com/minio/minio.git
145 lines
4.2 KiB
Go
145 lines
4.2 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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"encoding/base64"
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"fmt"
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"net/http"
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"sort"
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"github.com/minio/minio-go/v7/pkg/s3utils"
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"github.com/minio/minio-go/v7/pkg/set"
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)
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func toBinaryEqualsFuncString(n name, key Key, values set.StringSet) string {
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valueStrings := values.ToSlice()
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sort.Strings(valueStrings)
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return fmt.Sprintf("%v:%v:%v", n, key, valueStrings)
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}
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// binaryEqualsFunc - String equals function. It checks whether value by Key in given
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// values map is in condition values.
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// For example,
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// - if values = ["mybucket/foo"], at evaluate() it returns whether string
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// in value map for Key is in values.
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type binaryEqualsFunc struct {
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k Key
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values set.StringSet
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}
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// evaluate() - evaluates to check whether value by Key in given values is in
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// condition values.
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func (f binaryEqualsFunc) 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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fvalues := f.values.ApplyFunc(substFuncFromValues(values))
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return !fvalues.Intersection(set.CreateStringSet(requestValue...)).IsEmpty()
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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 binaryEqualsFunc) key() Key {
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return f.k
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}
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// name() - returns "BinaryEquals" condition name.
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func (f binaryEqualsFunc) name() name {
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return binaryEquals
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}
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func (f binaryEqualsFunc) String() string {
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return toBinaryEqualsFuncString(binaryEquals, f.k, f.values)
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}
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// toMap - returns map representation of this function.
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func (f binaryEqualsFunc) 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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values := NewValueSet()
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for _, value := range f.values.ToSlice() {
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values.Add(NewStringValue(base64.StdEncoding.EncodeToString([]byte(value))))
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}
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return map[Key]ValueSet{
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f.k: values,
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}
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}
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func validateBinaryEqualsValues(n name, key Key, values set.StringSet) error {
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vslice := values.ToSlice()
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for _, s := range vslice {
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sbytes, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return err
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}
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values.Remove(s)
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s = string(sbytes)
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switch key {
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case S3XAmzCopySource:
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bucket, object := path2BucketAndObject(s)
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if object == "" {
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return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzCopySource, n)
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}
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if err = s3utils.CheckValidBucketName(bucket); err != nil {
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return err
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}
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case S3XAmzServerSideEncryption, S3XAmzServerSideEncryptionCustomerAlgorithm:
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if s != "AES256" {
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return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzServerSideEncryption, n)
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}
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case S3XAmzMetadataDirective:
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if s != "COPY" && s != "REPLACE" {
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return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzMetadataDirective, n)
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}
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case S3XAmzContentSha256:
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if s == "" {
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return fmt.Errorf("invalid empty value for '%v' for %v condition", S3XAmzContentSha256, n)
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}
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}
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values.Add(s)
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}
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return nil
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}
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// newBinaryEqualsFunc - returns new BinaryEquals function.
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func newBinaryEqualsFunc(key Key, values ValueSet) (Function, error) {
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valueStrings, err := valuesToStringSlice(binaryEquals, values)
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if err != nil {
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return nil, err
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}
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return NewBinaryEqualsFunc(key, valueStrings...)
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}
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// NewBinaryEqualsFunc - returns new BinaryEquals function.
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func NewBinaryEqualsFunc(key Key, values ...string) (Function, error) {
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sset := set.CreateStringSet(values...)
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if err := validateBinaryEqualsValues(binaryEquals, key, sset); err != nil {
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return nil, err
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}
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return &binaryEqualsFunc{key, sset}, nil
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}
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