Rename pkg/{tagging,lifecycle} to pkg/bucket sub-directory (#8892)

Rename to allow for more such features to come in a more
proper hierarchical manner.

pkg/bucket/policy/condition/binaryequalsfunc.go

@@ -0,0 +1,139 @@
+/*
+ * 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/v6/pkg/s3utils"
+	"github.com/minio/minio-go/v6/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)
+			}
+		}
+		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
+}