restic/vendor/github.com/minio/minio-go/examples/s3/putobject-getobject-sse.go

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// +build ignore
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2017 Minio, Inc.
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*
* 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 main
import (
"bytes"
"crypto/md5"
"encoding/base64"
"io/ioutil"
"log"
minio "github.com/minio/minio-go"
)
func main() {
// Note: YOUR-ACCESSKEYID, YOUR-SECRETACCESSKEY, my-testfile, my-bucketname and
// my-objectname are dummy values, please replace them with original values.
// New returns an Amazon S3 compatible client object. API compatibility (v2 or v4) is automatically
// determined based on the Endpoint value.
minioClient, err := minio.New("s3.amazonaws.com", "YOUR-ACCESSKEYID", "YOUR-SECRETACCESSKEY", true)
if err != nil {
log.Fatalln(err)
}
content := bytes.NewReader([]byte("Hello again"))
key := []byte("32byteslongsecretkeymustprovided")
h := md5.New()
h.Write(key)
encryptionKey := base64.StdEncoding.EncodeToString(key)
encryptionKeyMD5 := base64.StdEncoding.EncodeToString(h.Sum(nil))
// Amazon S3 does not store the encryption key you provide.
// Instead S3 stores a randomly salted HMAC value of the
// encryption key in order to validate future requests.
// The salted HMAC value cannot be used to derive the value
// of the encryption key or to decrypt the contents of the
// encrypted object. That means, if you lose the encryption
// key, you lose the object.
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var metadata = map[string]string{
"x-amz-server-side-encryption-customer-algorithm": "AES256",
"x-amz-server-side-encryption-customer-key": encryptionKey,
"x-amz-server-side-encryption-customer-key-MD5": encryptionKeyMD5,
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}
// minioClient.TraceOn(os.Stderr) // Enable to debug.
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_, err = minioClient.PutObject("mybucket", "my-encrypted-object.txt", content, 11, minio.PutObjectOptions{UserMetadata: metadata})
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if err != nil {
log.Fatalln(err)
}
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opts := minio.GetObjectOptions{}
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for k, v := range metadata {
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opts.Set(k, v)
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}
coreClient := minio.Core{minioClient}
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reader, _, err := coreClient.GetObject("mybucket", "my-encrypted-object.txt", opts)
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if err != nil {
log.Fatalln(err)
}
defer reader.Close()
decBytes, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatalln(err)
}
if !bytes.Equal(decBytes, []byte("Hello again")) {
log.Fatalln("Expected \"Hello, world\", got %s", string(decBytes))
}
}