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https://github.com/gigawattio/awsarn
AWS ARN Parser package for Go
https://github.com/gigawattio/awsarn
aws go golang
Last synced: about 2 months ago
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AWS ARN Parser package for Go
- Host: GitHub
- URL: https://github.com/gigawattio/awsarn
- Owner: gigawattio
- License: mit
- Created: 2017-08-03T23:13:09.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2018-03-17T19:02:44.000Z (over 6 years ago)
- Last Synced: 2024-06-21T15:27:51.243Z (3 months ago)
- Topics: aws, go, golang
- Language: Go
- Homepage: https://gigawatt.io/
- Size: 6.84 KB
- Stars: 12
- Watchers: 3
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-golang-repositories - awsarn
README
# awsarn
[](https://godoc.org/github.com/gigawattio/awsarn)
[](https://travis-ci.org/gigawattio/awsarn)
[](https://goreportcard.com/report/github.com/gigawattio/awsarn)
### About
[awsarn](https://github.com/gigawattio/awsarn) is an ARN parser.
More specifically, this is a Go (golang) library for validating, parsing, and comparing AWS ARN resource identifier strings.
This package also provides the capability of determining if one ARN is a superset of another. This is useful for safely eliminating redundant ARNs from a set.
Created by [Jay Taylor](https://jaytaylor.com/) and used by [Gigawatt](https://gigawatt.io/).
#### ARN Vocabulary
The AWS documentation uses [two subtly different sets of vocabulary](#further-reading) when discussing the internal workings of ARNs:
Variant #1
```
arn:partition:service:region:account-id:resource
arn:partition:service:region:account-id:resourcetype/resource
arn:partition:service:region:account-id:resourcetype:resource
```
Variant #2
```
arn:partition:service:region:namespace:relative-id
```
This package uses the vocabulary of variant #1, that is:
* arn
* partition
* service
* region
* account-id
* resource, resourcetype/resource, resourcetype:resource
#### Wildcards
The documentation is ambiguous about which components of an ARN allow wildcards like `*` and `?`. This package uses the loosest possible interpretation, which means wildcards are allowed in any and all parts of ARNs.
### Requirements
* Go version 1.1 or newer
### Example usage
Parse an AWS ARN for an RDS database:
[examples/rds.go](examples/rds.go)
```go
package main
import (
"fmt"
"github.com/gigawattio/awsarn"
)
const arn = "arn:aws:rds:region:account-id:db:db-instance-name"
func main() {
components, err := awsarn.Parse(arn)
if err != nil {
panic(err)
}
fmt.Printf("%# v\n", *components)
eq := components.String() == arn
fmt.Printf("Reconstruction: %v, equal=%v\n", components.String(), eq)
}
```
Output:
```shell
awsarn.Components{
ARN: "arn",
Partition: "aws",
Service: "rds",
Region: "region",
AccountID: "account-id",
ResourceType: "db",
Resource: "db-instance-name"
ResourceDelimiter: ":"
}
Reconstruction: arn:aws:rds:region:account-id:db:db-instance-name, equal=true
```
Also may be worth checking out the [unit-tests](awsarn_test.go), too!
### Running the test suite
go test -v ./...
echo $?
if `echo $?` produces a 0, that's a clean exit status and means the tests succeeded. Anything else indicates one or more failed tests.
### Terminology
* ARN: Amazon Resource Name; used for identifying, specifying, and referencing resources
* AWS: Amazon Web Services; Cloud provider
### Components of an ARN
Piece by piece:
arn:partition:service:region:account-id:resourcetype/resource
**arn**
> This should always be the string "arn", indicating the start of an ARN.
**partition**
> 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.
**service**
>The service namespace that identifies the AWS product (for example, Amazon
>S3, IAM, or Amazon RDS). For a list of namespaces, see AWS Service Namespaces.
**region**
> The region the resource resides in. Note that the ARNs for some resources do
> not require a region, so this component might be omitted.
**account**
> 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.
**resource, resourcetype:resource, or resourcetype/resource**
> 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
> Paths in ARNs.
### Further reading
* [Amazon AWS ARN documentation](http://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html)
* [Amazon AWS S3 ARN format](http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-arn-format.html)
### License
Permissive MIT license, see the [LICENSE](LICENSE) file for more information.