Invalidate Cloudfront action

A GitHub Workflow Action which invalidates the given Cloudfront distribution paths.

Usage

The sample workflow below illustrates a static site build and deploy.

name: Build and Deploy
on:
  push:
    branches:
      - master

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:
    - name: checkout
      uses: actions/checkout@master

    - name: setup node
      uses: actions/setup-node@v1
      with:
        node-version: '10.x'

    # Run the build script which populates the ./dist folder
    - name: build
      run: |
        yarn
        yarn run build

    # Merge ./dist into the 'gh-pages' branch (dist in this case)
    - name: update dist branch
      uses: peaceiris/[email protected]
      env:
        PERSONAL_TOKEN: ${{ secrets.ACCESS_TOKEN }}
        PUBLISH_BRANCH: dist
        PUBLISH_DIR: ./dist

    # Check out the new branch
    - name: checkout dist
      uses: actions/checkout@master
      with:
        ref: dist

    # Fix timestamps
    - name: restore timestamps
      uses: chetan/git-restore-mtime-action@release

    # Upload to S3
    - name: sync s3
      uses: jakejarvis/s3-sync-action@2fb81a9e9fea11e078587911c27754e42e6a6e88
      with:
        args: --exclude '.git*/*' --delete --follow-symlinks
      env:
        SOURCE_DIR: './'
        AWS_REGION: 'us-east-1'
        AWS_S3_BUCKET: ${{ secrets.AWS_S3_BUCKET }}
        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

    # Invalidate Cloudfront (this action)
    - name: invalidate
      uses: chetan/invalidate-cloudfront-action@master
      env:
        DISTRIBUTION: ${{ secrets.DISTRIBUTION }}
        PATHS: '/index.html'
        AWS_REGION: 'us-east-1'
        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

Configuration

Param	Required?	Description
PATHS	yes*	A list of one or more space-separated paths to invalidate
PATHS_FROM	yes*	Filename to read list of paths from
DISTRIBUTION	yes	Cloudfront distribution ID to operate on, e.g., 'EDFDVBD6EXAMPLE'
AWS_REGION	yes	AWS Region to operate in
AWS_ACCESS_KEY_ID	yes	Access key with necessary permissions to invalidate objects in the target distribution (see below)
AWS_SECRET_ACCESS_KEY	yes	Secret key
DEBUG	no	When set to "1", prints the final awscli invalidation command for troubleshooting purposes

Note: either PATHS or PATHS_FROM is required. PATHS_FROM will overwrite PATHS if both are set.

See also: AWS CLI reference

Paths

Paths are passed directly to the aws cli create-invalidation command and so must be a proper space-separated list of paths. Examples:

PATHS=/index.html
PATHS=/ /index.html /foo/bar/baz

Alternatively, you can write the list of files to invalidate to a file which will then be slurped into the PATHS variable. This lets you use some other method to dynamically generate the list of files based on the commit, etc. Example workflow steps:

- name: checkout dist
  uses: actions/checkout@master
  with:
    ref: dist
    # need at least 2 here so we can get a proper log in next step
    fetch-depth: 2

- name: get updated files
  run: |
    # allow grep to fail
    set +e
    FILES=$(git log --stat="1000" -1 | grep '|' | awk '{print "/"$1}' | grep -e '\.html$')
    set -e
    [ -z "$FILES" ] && touch .updated_files && exit 0
    for file in $FILES; do
      echo $file
      # add bare directory to list of updated paths when we see index.html
      [[ "$file" == *"/index.html" ]] && echo $file | sed -e 's/\/index.html$/\//'
    done | sort | uniq | tr '\n' ' ' > .updated_files

- name: invalidate
  uses: chetan/invalidate-cloudfront-action@master
  env:
    PATHS_FROM: .updated_files
    AWS_REGION: 'us-east-1'
    DISTRIBUTION: ${{ secrets.DISTRIBUTION }}
    AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
    AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

AWS IAM Policy

In order to use this action, you will need to supply an access key pair which has, at minimum, the following permission:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": "cloudfront:CreateInvalidation",
            "Resource": "arn:aws:cloudfront::<account id>:distribution/*"
        }
    ]
}

Note that cloudfront does not support resource-level permissions.