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s3_set_bucket_policy.go
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s3_set_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 (
"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"
)
// Sets a read only anonymous user 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_put_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)
// Create a policy using map interface. Filling in the bucket as the
// resource.
readOnlyAnonUserPolicy := map[string]interface{}{
"Version": "2012-10-17",
"Statement": []map[string]interface{}{
{
"Sid": "AddPerm",
"Effect": "Allow",
"Principal": "*",
"Action": []string{
"s3:GetObject",
},
"Resource": []string{
fmt.Sprintf("arn:aws:s3:::%s/*", bucket),
},
},
},
}
// Marshal the policy into a JSON value so that it can be sent to S3.
policy, err := json.Marshal(readOnlyAnonUserPolicy)
if err != nil {
exitErrorf("Failed to marshal policy, %v", err)
}
// Call S3 to put the policy for the bucket.
_, err = svc.PutBucketPolicy(&s3.PutBucketPolicyInput{
Bucket: aws.String(bucket),
Policy: aws.String(string(policy)),
})
if err != nil {
if aerr, ok := err.(awserr.Error); ok && aerr.Code() == s3.ErrCodeNoSuchBucket {
// Special error handling for the when the bucket doesn't
// exists so we can give a more direct error message from the CLI.
exitErrorf("Bucket %q does not exist", bucket)
}
exitErrorf("Unable to set bucket %q policy, %v", bucket, err)
}
fmt.Printf("Successfully set bucket %q's policy\n", bucket)
}
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}