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lambda.go
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lambda.go
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// Copyright (c) 2020, Amazon.com, 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 cmd
import (
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/secretsmanager"
"github.com/awslabs/ssosync/internal"
"github.com/awslabs/ssosync/internal/config"
)
// inLambda detects if we are running Lambda and will
// return true if we are
func inLambda() bool {
return len(os.Getenv("_LAMBDA_SERVER_PORT")) > 0
}
// writeSecretToFile will write the given secret out to a temporary file
// prefixed with 'name'.
func writeSecretToFile(secretKey string, name string) (string, error) {
s := session.Must(session.NewSession())
svc := secretsmanager.New(s)
r, err := svc.GetSecretValue(&secretsmanager.GetSecretValueInput{
SecretId: aws.String(secretKey),
VersionStage: aws.String("AWSCURRENT"),
})
if err != nil {
return "", err
}
var secretString string
if r.SecretString != nil {
secretString = *r.SecretString
} else {
decodedBinarySecretBytes := make([]byte, base64.StdEncoding.DecodedLen(len(r.SecretBinary)))
l, err := base64.StdEncoding.Decode(decodedBinarySecretBytes, r.SecretBinary)
if err != nil {
return "", err
}
secretString = string(decodedBinarySecretBytes[:l])
}
f, err := ioutil.TempFile("", fmt.Sprintf("%s-*", name))
if err != nil {
return "", err
}
if _, err = f.WriteString(secretString); err != nil {
return "", err
}
if err := f.Close(); err != nil {
return "", err
}
return f.Name(), nil
}
// removeFileSilently handles the fact we want to delete temporary
// files - but we don't care if it fails. So we can use it in
// defer without warnings.
func removeFileSilently(name string) {
_ = os.Remove(name)
}
// lambdaHandler is the Lambda entry point.
func lambdaHandler(cfg *config.Config) func() error {
return func() error {
if err := internal.DoSync(cfg); err != nil {
return err
}
return nil
}
}