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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 encryption
import (
"encoding/binary"
"fmt"
"unsafe"
)
// StringKeyIDRetriever implements the KeyRetriever interface GetKey
// to allow setting in keys with a string id.
type StringKeyIDRetriever map[string]string
// PutKey adds a key with the given string ID that can be retrieved
func (s StringKeyIDRetriever) PutKey(keyID, key string) {
s[keyID] = key
}
// GetKey expects the keymetadata to match one of the keys that were added
// with PutKey and panics if the key cannot be found.
func (s StringKeyIDRetriever) GetKey(keyMetadata []byte) string {
k, ok := s[*(*string)(unsafe.Pointer(&keyMetadata))]
if !ok {
panic(fmt.Errorf("parquet: key missing for id %s", keyMetadata))
}
return k
}
// IntegerKeyIDRetriever is used for using unsigned 32bit integers as key ids.
type IntegerKeyIDRetriever map[uint32]string
// PutKey adds keys with uint32 IDs
func (i IntegerKeyIDRetriever) PutKey(keyID uint32, key string) {
i[keyID] = key
}
// GetKey expects the key metadata bytes to be a little endian uint32 which
// is then used to retrieve the key bytes. Panics if the key id cannot be found.
func (i IntegerKeyIDRetriever) GetKey(keyMetadata []byte) string {
keyID := binary.LittleEndian.Uint32(keyMetadata)
k, ok := i[keyID]
if !ok {
panic(fmt.Errorf("parquet: key missing for id %d", keyID))
}
return k
}
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