GitHub Action: aws-region-reduction-map

Converts AWS region names from full names to abbreviations

Introduction

Converts AWS region names from full names to either "fixed" (always 3 characters) or "short" (usually 4 or 5 characters) abbreviations, following the same map as https://github.com/cloudposse/terraform-aws-utils

Short abbreviations are generally the same as official AWS availability zone IDs.

Generally, AWS region names have 3 parts and the "fixed" abbreviation is the first character of each part. Exceptions (due to collisions):

• Africa and China use second letter of first part.
• ap-south-1 is shortened to as0 to avoid conflict with ap-southeast-1
• cn-north-1 is shortened to nn0 to avoid conflict with cn-northwest-1

You should be able to list all regions with this command:

aws ec2 describe-regions --all-regions --query "Regions[].{Name:RegionName}" --output text

but actually it leaves out GovCloud and China See https://github.com/jsonmaur/aws-regions for more complete list

long	fixed	short
ap-east-1	ae1	ape1
ap-northeast-1	an1	apne1
ap-northeast-2	an2	apne2
ap-northeast-3	an3	apne3
ap-south-1	as0	aps1
ap-southeast-1	as1	apse1
ap-southeast-2	as2	apse2
ca-central-1	cc1	cac1
eu-central-1	ec1	euc1
eu-north-1	en1	eun1
eu-south-1	es1	eus1
eu-west-1	ew1	euw1
eu-west-2	ew2	euw2
eu-west-3	ew3	euw3
af-south-1	fs1	afs1
us-gov-east-1	ge1	usge1
us-gov-west-1	gw1	usgw1
me-south-1	ms1	mes1
cn-north-1	nn0	cnn1
cn-northwest-1	nn1	cnnw1
sa-east-1	se1	sae1
us-east-1	ue1	use1
us-east-2	ue2	use2
us-west-1	uw1	usw1
us-west-2	uw2	usw2

Usage

Convert AWS region (ex.: us-west-2) to fixed abbreviation - will be uw2.

  name: Pull Request
  on:
    pull_request:
      branches: [ 'main' ]
      types: [opened, synchronize, reopened, closed, labeled, unlabeled]

  jobs:
    context:
      runs-on: ubuntu-latest
      steps:
        - uses: cloudposse/github-action-aws-region-reduction-map@main
          id: aws_map
          with:
            region: 'us-west-2'
            ## Format can be skipped - default format would be `fixed` if region is long 
            format: 'fixed'

      outputs:
        result: ${{ steps.aws_map.outputs.result }}

Convert AWS region (ex.: us-west-2) to short abbreviation - will be usw2.

  name: Pull Request
  on:
    pull_request:
      branches: [ 'main' ]
      types: [opened, synchronize, reopened, closed, labeled, unlabeled]

  jobs:
    context:
      runs-on: ubuntu-latest
      steps:
        - uses: cloudposse/github-action-aws-region-reduction-map@main
          id: aws_map
          with:
            region: 'us-west-2'
            format: 'short'

      outputs:
        result: ${{ steps.aws_map.outputs.result }}

Convert short AWS region (ex.: usw2) to long abbreviation - will be us-west-2.

  name: Pull Request
  on:
    pull_request:
      branches: [ 'main' ]
      types: [opened, synchronize, reopened, closed, labeled, unlabeled]

  jobs:
    context:
      runs-on: ubuntu-latest
      steps:
        - uses: cloudposse/github-action-aws-region-reduction-map@main
          id: aws_map
          with:
            region: 'usw2'
            format: 'long'

      outputs:
        result: ${{ steps.aws_map.outputs.result }}

Convert fixed AWS region (ex.: uw2) to long abbreviation - will be us-west-2.

  name: Pull Request
  on:
    pull_request:
      branches: [ 'main' ]
      types: [opened, synchronize, reopened, closed, labeled, unlabeled]

  jobs:
    context:
      runs-on: ubuntu-latest
      steps:
        - uses: cloudposse/github-action-aws-region-reduction-map@main
          id: aws_map
          with:
            region: 'uw2'
            format: 'long'

      outputs:
        result: ${{ steps.aws_map.outputs.result }}

Inputs

Name	Description	Default	Required
format	Format convert to. Valid values ('long', 'short', 'fixed'). If empty short and fixed inputs are converted to long, long inputs are converted to fixed.	N/A	false
region	Input region code	N/A	true

Outputs

Name	Description
result	Converted AWS region