name: Sync GitHub Release Assets

on:
  workflow_dispatch:
  schedule:
    - cron: '0 0 * * *'

concurrency:
  group: release-assets-dist-sync
  cancel-in-progress: true

permissions:
  contents: write  #  to upload release asset

jobs:
  dist-ipfs-tech:
    if: github.repository == 'ipfs/kubo' || github.event_name == 'workflow_dispatch'
    runs-on: "ubuntu-latest"
    timeout-minutes: 5
    steps:
      - uses: ipfs/download-ipfs-distribution-action@v1
      - uses: ipfs/start-ipfs-daemon-action@v1
        with:
          args: --init --init-profile=flatfs,server --enable-gc=false
      - uses: actions/setup-node@v2
        with:
          node-version: 14
      - name: Sync the latest 5 github releases
        uses: actions/github-script@v4
        with:
          script: |
            const fs = require('fs').promises
            const max_synced = 5

            // fetch github releases
            resp = await github.repos.listReleases({
              owner: context.repo.owner,
              repo: context.repo.repo,
              page: 1,
              per_page: max_synced
            })
            const release_assets = [];
            num_synced = 0;
            for (const release of resp.data) {
              console.log("checking release tagged", release.tag_name)
              if (num_synced > max_synced) {
                console.log("done: synced", max_synced, "latest releases")
                break;
              }
              num_synced += 1

              const github_assets = new Set()
              for (const asset of release.assets) {
                github_assets.add(asset.name)
              }

              // fetch asset info from dist.ipfs.tech
              p = '/ipns/dist.ipfs.tech/kubo/' + release.tag_name
              let stdout = ''
              const options = {}
              options.listeners = {
                stdout: (data) => {
                  stdout += data.toString();
                }
              }
              await exec.exec('ipfs', ['ls', p], options)

              const dist_assets = new Set()
              const missing_files = []
              for (const raw_line of stdout.split("\n")) {
                line = raw_line.trim();
                if (line.length != 0) {
                  file = line.split(/(\s+)/).filter( function(e) { return e.trim().length > 0; } )[2]
                  dist_assets.add(file)
                  if (!github_assets.has(file)) {
                    missing_files.push(file)
                  }
                }
              }

              // if dist.ipfs.tech has files not found in github, copy them over
              for (const file of missing_files) {
                file_sha = file + ".sha512"
                file_cid = file + ".cid"

                // skip files that don't have .cid and .sha512 checksum files
                if (!dist_assets.has(file_sha) || !dist_assets.has(file_cid)) {
                  if (!file.endsWith('.cid') && !file.endsWith('.sha512')) { // silent skip of .sha512.sha512 :)
                    console.log(`skipping "${file}" as dist.ipfs.tech does not provide .cid and .sha512 checksum files for it`)
                  }
                  continue
                }

                console.log("fetching", file, "from dist.ipfs.tech")
                await exec.exec('ipfs', ['get', p + '/' + file])
                await exec.exec('ipfs', ['get', p + '/' + file_sha])
                await exec.exec('ipfs', ['get', p + '/' + file_cid])
                console.log("verifying contents of", file)

                // compute sha512 output for file
                let sha_stdout = ''
                const sha_options = {}
                sha_options.listeners = {
                  stdout: (data) => {
                    sha_stdout += data.toString();
                  }
                }
                await exec.exec('sha512sum', [file], sha_options)
                // read expected sha512 output
                const sha_data = await fs.readFile(file_sha, "utf8")
                const digest = (s) => s.split(' ').shift()
                if (digest(sha_data) != digest(sha_stdout)) {
                  console.log(`${file}.sha512: ${sha_data}`)
                  console.log(`sha512sum ${file}: ${sha_stdout}`)
                  throw "checksum verification failed for " + file
                }

                console.log("uploading", file, "to github release", release.tag_name)
                const uploadReleaseAsset = async (file) => github.repos.uploadReleaseAsset({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  release_id: release.id,
                  headers: {
                    "content-type": "application/octet-stream",
                    "content-length": `${(await fs.stat(file)).size}`
                  },
                  name: file,
                  data: await fs.readFile(file)
                })
                await uploadReleaseAsset(file)
                await uploadReleaseAsset(file_sha)
                await uploadReleaseAsset(file_cid)

              }
              // summary of assets on both sides
              release_assets.push({ tag: release.tag_name, github_assets, dist_assets })
            }
            console.log(release_assets)
            return release_assets