/
file.go
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/
file.go
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// Copyright 2020 Google Inc. All Rights Reserved.
//
// 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 config
import (
"context"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"net/http"
"os"
"cloud.google.com/go/storage"
"github.com/GoogleCloudPlatform/osconfig/external"
"github.com/GoogleCloudPlatform/osconfig/util"
agentendpointpb "google.golang.org/genproto/googleapis/cloud/osconfig/agentendpoint/v1"
)
func checksum(r io.Reader) string {
hash := sha256.New()
io.Copy(hash, r)
return hex.EncodeToString(hash.Sum(nil))
}
func downloadFile(ctx context.Context, path string, perms os.FileMode, file *agentendpointpb.OSPolicy_Resource_File) (string, error) {
var reader io.ReadCloser
var err error
var wantChecksum string
switch file.GetType().(type) {
case *agentendpointpb.OSPolicy_Resource_File_Gcs_:
client, err := storage.NewClient(ctx)
if err != nil {
return "", fmt.Errorf("error creating gcs client: %v", err)
}
defer client.Close()
reader, err = external.FetchGCSObject(ctx, client, file.GetGcs().GetBucket(), file.GetGcs().GetObject(), file.GetGcs().GetGeneration())
if err != nil {
return "", err
}
case *agentendpointpb.OSPolicy_Resource_File_Remote_:
reader, err = external.FetchRemoteObjectHTTP(ctx, &http.Client{}, file.GetRemote().GetUri())
if err != nil {
return "", err
}
wantChecksum = file.GetRemote().GetSha256Checksum()
default:
return "", fmt.Errorf("unknown remote File type: %+v", file.GetType())
}
defer reader.Close()
return util.AtomicWriteFileStream(reader, wantChecksum, path, perms)
}