name: Synchronize with CDN

on:
  push:
    branches:
      - "master"

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  sync_with_cdn:
    name: Synchronize with CDN
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Checkout Repo
        uses: actions/checkout@v3

      - name: Synchronize with CDN
        env:
          AWS_ACCESS_KEY: ${{ secrets.CDN_ACCESS_KEY }}
          AWS_SECRET_KEY: ${{ secrets.CDN_SECRET_KEY }}
          CDN_BUCKET: ${{ secrets.CDN_BUCKET }}
          DO_TOKEN: ${{ secrets.DO_TOKEN }}
          CDN_ID: ${{ secrets.CDN_ID }}
        run: |
          #!/bin/bash

          set -e
          set -o pipefail

          CURRENT_DIR=$(pwd)

          # Install rclone
          TMPDIR=$(mktemp -d)
          cd $TMPDIR
          curl -O https://downloads.rclone.org/rclone-current-linux-amd64.zip
          unzip rclone-current-linux-amd64.zip
          cd rclone-*-linux-amd64
          sudo cp rclone /usr/bin/
          sudo chown root:root /usr/bin/rclone
          sudo chmod 755 /usr/bin/rclone

          cd $CURRENT_DIR

          # Create a S3 target
          rclone config create s3 s3 provider=DigitalOcean env_auth=true region=fra1 endpoint=fra1.digitaloceanspaces.com acl=public-read

          # remove `.github` and any other paths we do not want in the CDN
          rm -rf .github .git

          # Note all the files that are missing in cdn, missing in repo or they are different
          echo "Checking files"
          (rclone check s3:$CDN_BUCKET/icons icons --download --combined /tmp/diff || true)

          # List all files that are different
          echo "Listing all differences"
          cat /tmp/diff | grep --quiet --invert-match '^=' || echo "No changes"

          # Synchronize the `icons` directory
          # Note: This command should be added for any new directories in this repo
          # otherwise, they'll not be synced
          echo "Syncing files"
          rclone sync icons s3:$CDN_BUCKET/icons

          rclone config delete s3

          # Wipe out DigitalOcean CDN cache
          # Note: This command should be added for any new directories in this repo
          # otherwise, cache for those directories will not be cleared
          curl -X DELETE -H "Content-Type: application/json" -H "Authorization: Bearer $DO_TOKEN" -d '{"files": ["icons/*"]}' https://api.digitalocean.com/v2/cdn/endpoints/$CDN_ID/cache

          # Purge each entry in /tmp/diff from cloudflare's cache
          cat /tmp/diff | grep --quiet --invert-match '^=' || true | while read line;
          do
            entry=$(echo $line | awk '{print $2}');
            url="https://cdn.instadapp.io/icons/${entry}"
            echo "Clearing $url from cache"
            curl -X POST "https://api.cloudflare.com/client/v4/zones/${{ secrets.CLOUDFLARE_ZONE_ID }}/purge_cache" -H "Authorization: Bearer ${{ secrets.CLOUDFLARE_API_KEY }}" -H "Content-Type: application/json" --data "{\"files\": [\"$url\"]}"
          done;