The JSON body structure can be seen from this sample:

<details><summary>Request Body Sample</summary>

```json
{
  "input": {
    "account": "minio",
    "groups": null,
    "action": "s3:ListBucket",
    "bucket": "test",
    "conditions": {
      "Authorization": [

	policy := "mypolicy"
	policyBytes := fmt.Appendf(nil, `{
 "Version": "2012-10-17",
 "Statement": [
  {
   "Effect": "Allow",
   "Action": [
    "s3:PutObject",
    "s3:GetObject",
    "s3:ListBucket"
   ],
   "Resource": [
    "arn:aws:s3:::%s/*"
   ]
  }
 ]
}`, bucket)
	err = s.adm.AddCannedPolicy(ctx, policy, policyBytes)
	if err != nil {
		c.Fatalf("policy add error: %v", err)
	}

ffect":"Allow","Principal":{"AWS":["*"]},"Action":["s3:GetBucketLocation","s3:ListBucket"],"Resource":["arn:aws:s3:::%s"]},{"Sid":"","Effect":"Allow","Principal":{"AWS":["*"]},"Action":["s3:GetObject"],"Resource":["arn:aws:s3:::%s/this*"]}]}`

	bucketPolicyTemplateWithoutVersion := `{"Version":"","Statement":[{"Sid":"","Effect":"Allow","Principal":{"AWS":["*"]},"Action":["s3:GetBucketLocation","s3:ListBucket"],"Resource":["arn:aws:s3:::%s"]},{"Sid":"","Effect":"Allow","Principal":{"AWS...

			Principal: miniogopolicy.User{AWS: set.CreateStringSet("*")},
			Resources: set.CreateStringSet(policy.NewResource(bucketName).String()),
			Actions:   set.CreateStringSet("s3:GetBucketLocation", "s3:ListBucket"),
		},
		{
			Effect:    string(policy.Allow),
			Principal: miniogopolicy.User{AWS: set.CreateStringSet("*")},
			Resources: set.CreateStringSet(policy.NewResource(bucketName + "/" + prefix).String()),

    ],
    "Effect": "Allow",
    "Sid": ""
  },
  {
   "Effect": "Allow",
   "Action": [
    "s3:GetReplicationConfiguration",
    "s3:PutReplicationConfiguration",
    "s3:ListBucket",
    "s3:ListBucketMultipartUploads",
    "s3:GetBucketLocation",
    "s3:GetBucketVersioning"
   ],
   "Resource": [
    "arn:aws:s3:::srcbucket"
   ]
  }
 ]
}
```

			// the error Amazon S3 returns depends on
			// whether you also have the s3:ListBucket
			// permission.
			// * If you have the s3:ListBucket permission
			//   on the bucket, Amazon S3 will return an
			//   HTTP status code 404 ("no such key")
			//   error.
			// * if you don’t have the s3:ListBucket
			//   permission, Amazon S3 will return an HTTP
			//   status code 403 ("access denied") error.`

			ObjectName:      object,
		}) {
			// Request is allowed return the appropriate access key.
			return ErrNone
		}

		if action == policy.ListBucketVersionsAction {
			// In AWS S3 s3:ListBucket permission is same as s3:ListBucketVersions permission
			// verify as a fallback.
			if globalPolicySys.IsAllowed(policy.BucketPolicyArgs{
				AccountName:     cred.AccessKey,
				Groups:          cred.Groups,

	policy := "mypolicy"
	policyBytes := []byte(`{
 "Version": "2012-10-17",
 "Statement": [
  {
   "Effect": "Allow",
   "Action": [
    "s3:PutObject",
    "s3:GetObject",
    "s3:ListBucket"
   ],
   "Resource": [
    "arn:aws:s3:::BUCKET/*"
   ]
  }
 ]
}`)

	err := s.adm.AddCannedPolicy(ctx, policy, policyBytes)
	if err != nil {
		c.Fatalf("policy add error: %v", err)

func (s *TestSuiteCommon) TestBucketPolicy(c *check) {
	// Sample bucket policy.
	bucketPolicyBuf := `{"Version":"2012-10-17","Statement":[{"Action":["s3:GetBucketLocation","s3:ListBucket"],"Effect":"Allow","Principal":{"AWS":["*"]},"Resource":["arn:aws:s3:::%s"]},{"Action":["s3:GetObject"],"Effect":"Allow","Principal":{"AWS":["*"]},"Resource":["arn:aws:s3:::%s/this*"]}]}`

	// generate a random bucket Name.