forked from awsdocs/aws-doc-sdk-examples
/
s3_get_bucket_policy.go
73 lines (62 loc) · 1.93 KB
/
s3_get_bucket_policy.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main
import (
"bytes"
"encoding/json"
"fmt"
"os"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
// Prints the policy for a bucket. If the bucket doesn't exist, or there was
// and error an error message will be printed instead.
//
// Usage:
//
// go run s3_get_bucket_policy.go BUCKET_NAME
func main() {
if len(os.Args) != 2 {
exitErrorf("bucket name required\nUsage: %s bucket_name",
filepath.Base(os.Args[0]))
}
bucket := os.Args[1]
// Initialize a session in us-west-2 that the SDK will use to load
// credentials from the shared credentials file ~/.aws/credentials.
sess, err := session.NewSession(&aws.Config{
Region: aws.String("us-west-2")},
)
// Create S3 service client
svc := s3.New(sess)
// Call S3 to retrieve the policy for the selected bucket.
result, err := svc.GetBucketPolicy(&s3.GetBucketPolicyInput{
Bucket: aws.String(bucket),
})
if err != nil {
// Special error handling for the when the bucket doesn't
// exists so we can give a more direct error message from the CLI.
if aerr, ok := err.(awserr.Error); ok {
switch aerr.Code() {
case s3.ErrCodeNoSuchBucket:
exitErrorf("Bucket %q does not exist.", bucket)
case "NoSuchBucketPolicy":
exitErrorf("Bucket %q does not have a policy.", bucket)
}
}
exitErrorf("Unable to get bucket %q policy, %v.", bucket, err)
}
out := bytes.Buffer{}
policyStr := aws.StringValue(result.Policy)
if err := json.Indent(&out, []byte(policyStr), "", " "); err != nil {
exitErrorf("Failed to pretty print bucket policy, %v.", err)
}
fmt.Printf("%q's Bucket Policy:\n", bucket)
fmt.Println(out.String())
}
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}