reusable-s3.yaml

---

# Copyright 2023 Skyscanner Limited.

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Reusable Workflow for S3 uploads
name: Upload to S3

on:
  workflow_call:
    inputs:
      dry-run:
        required: false
        type: boolean
        description: Displays the operations that would be performed without actually running them.
        default: false
      artifact-name:
        required: false
        type: string
        description: Name of the artifact to upload.
        default: static-content

permissions:
  contents: read
  id-token: write

env:
  BUCKET: 'x'
  ROLE_TO_ASSUME: 'arn:aws:iam::####:role/X'
  REGION: 'x-x-#'

jobs:
  bucket-upload:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v6
        id: prepare-aws-role-session-name
        with:
          # https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithWebIdentity.html
          # RoleSessionName only permits [\w+=,.@-]*
          script: return "GitHubActions," + context.repo.owner + "@" + context.repo.repo
          result-encoding: string

      - name: Login AWS
        uses: aws-actions/configure-aws-credentials@v2.2.0
        with:
          role-to-assume: ${{ env.ROLE_TO_ASSUME }}
          role-session-name: ${{ steps.prepare-aws-role-session-name.outputs.result }}
          aws-region: ${{ env.REGION }}
          mask-aws-account-id: 'no'
          inline-session-policy: >-
            {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "s3:ListBucket"
                  ],
                  "Resource": [
                    "arn:aws:s3:::${{ env.BUCKET }}"
                  ]
                },
                {
                  "Effect": "Allow",
                  "Action": [
                    "s3:GetObject",
                    "s3:GetObjectAcl",
                    "s3:GetObjectVersion",
                    "s3:PutObject",
                    "s3:PutObjectAcl"
                  ],
                  "Resource": [
                    "arn:aws:s3:::${{ env.BUCKET }}/${{ github.repository }}/*"
                  ]
                }
              ]
            }

      
      - name: "Debug: sts get-caller-identity"
        run: |
          aws sts get-caller-identity --output table --color on

      - name: Download artifact
        uses: actions/download-artifact@v3
        with:
          name: ${{ inputs.artifact-name }}
          path: /tmp/bucket-upload/

      - name: List content to be uploaded
        run: ls /tmp/bucket-upload/

      - name: Upload to S3 bucket
        run: |
          aws s3 cp ${{ inputs.dry-run && '--dryrun' || '' }} --recursive /tmp/bucket-upload/ s3://${{ env.BUCKET }}/${{ github.repository }}