set-bucket-policy-for-web.go

// Copyright © 2017 Toru Motchie MOCHIDA
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package s3

import (
	"errors"
	"strings"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/service/s3"
)

var bucketPolicyForWebSite = `{
  "Version":"2012-10-17",
  "Statement":[{
	"Sid":"PublicReadGetObject",
        "Effect":"Allow",
	  "Principal": "*",
      "Action":["s3:GetObject"],
      "Resource":["arn:aws:s3:::example-bucket/*"
      ]
    }
  ]
}`

// SetBucketPolicyForWebSite replaces a policy on a bucket for Web Site.
func SetBucketPolicyForWebSite(bucket string) error {
	bucketPolicyForWebSite = strings.Replace(bucketPolicyForWebSite, "example-bucket", bucket, 1)

	params := &s3.PutBucketPolicyInput{
		Bucket: aws.String(bucket),
		Policy: aws.String(bucketPolicyForWebSite),
	}

	_, err := s3Clinet.PutBucketPolicy(params)

	if err != nil {
		if awsErr, ok := err.(awserr.Error); ok {
			return errors.New(awsErr.Message())
		}
		return errors.New(err.Error())
	}

	return nil
}