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// Package arn provides a parser for interacting with Amazon Resource Names.
package arn
import (
"errors"
"strings"
)
const (
arnDelimiter = ":"
arnSections = 6
arnPrefix = "arn:"
// zero-indexed
sectionPartition = 1
sectionService = 2
sectionRegion = 3
sectionAccountID = 4
sectionResource = 5
// errors
invalidPrefix = "arn: invalid prefix"
invalidSections = "arn: not enough sections"
)
// ARN captures the individual fields of an Amazon Resource Name.
// See http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html for more information.
type ARN struct {
// The partition that the resource is in. For standard AWS regions, the partition is "aws". If you have resources in
// other partitions, the partition is "aws-partitionname". For example, the partition for resources in the China
// (Beijing) region is "aws-cn".
Partition string
// The service namespace that identifies the AWS product (for example, Amazon S3, IAM, or Amazon RDS). For a list of
// namespaces, see
// http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html#genref-aws-service-namespaces.
Service string
// The region the resource resides in. Note that the ARNs for some resources do not require a region, so this
// component might be omitted.
Region string
// The ID of the AWS account that owns the resource, without the hyphens. For example, 123456789012. Note that the
// ARNs for some resources don't require an account number, so this component might be omitted.
AccountID string
// The content of this part of the ARN varies by service. It often includes an indicator of the type of resource —
// for example, an IAM user or Amazon RDS database - followed by a slash (/) or a colon (:), followed by the
// resource name itself. Some services allows paths for resource names, as described in
// http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html#arns-paths.
Resource string
}
// Parse parses an ARN into its constituent parts.
//
// Some example ARNs:
// arn:aws:elasticbeanstalk:us-east-1:123456789012:environment/My App/MyEnvironment
// arn:aws:iam::123456789012:user/David
// arn:aws:rds:eu-west-1:123456789012:db:mysql-db
// arn:aws:s3:::my_corporate_bucket/exampleobject.png
func Parse(arn string) (ARN, error) {
if !strings.HasPrefix(arn, arnPrefix) {
return ARN{}, errors.New(invalidPrefix)
}
sections := strings.SplitN(arn, arnDelimiter, arnSections)
if len(sections) != arnSections {
return ARN{}, errors.New(invalidSections)
}
return ARN{
Partition: sections[sectionPartition],
Service: sections[sectionService],
Region: sections[sectionRegion],
AccountID: sections[sectionAccountID],
Resource: sections[sectionResource],
}, nil
}
// IsARN returns whether the given string is an ARN by looking for
// whether the string starts with "arn:" and contains the correct number
// of sections delimited by colons(:).
func IsARN(arn string) bool {
return strings.HasPrefix(arn, arnPrefix) && strings.Count(arn, ":") >= arnSections-1
}
// String returns the canonical representation of the ARN
func (arn ARN) String() string {
return arnPrefix +
arn.Partition + arnDelimiter +
arn.Service + arnDelimiter +
arn.Region + arnDelimiter +
arn.AccountID + arnDelimiter +
arn.Resource
}
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