checkout/src/github-api-helper.ts

import * as assert from 'assert'
import * as core from '@actions/core'
import * as exec from '@actions/exec'
import * as fs from 'fs'
import * as github from '@actions/github'
import * as https from 'https'
import * as io from '@actions/io'
import * as path from 'path'
import * as refHelper from './ref-helper'
import * as retryHelper from './retry-helper'
import * as toolCache from '@actions/tool-cache'
import {ExecOptions} from '@actions/exec/lib/interfaces'
import {IncomingMessage} from 'http'
import {ReposGetArchiveLinkParams} from '@octokit/rest'
import {RequestOptions} from 'https'
import {WriteStream} from 'fs'

const IS_WINDOWS = process.platform === 'win32'

export async function downloadRepository(
  accessToken: string,
  owner: string,
  repo: string,
  ref: string,
  commit: string,
  repositoryPath: string
): Promise<void> {
  // Determine archive path
  const runnerTemp = process.env['RUNNER_TEMP'] as string
  assert.ok(runnerTemp, 'RUNNER_TEMP not defined')
  const archivePath = path.join(runnerTemp, 'checkout.tar.gz')
  // await fs.promises.writeFile(archivePath, raw)

  // Get the archive URL using the REST API
  await retryHelper.execute(async () => {
    // Prepare the archive stream
    core.debug(`Preparing the archive stream: ${archivePath}`)
    await io.rmRF(archivePath)
    const fileStream = fs.createWriteStream(archivePath)
    const fileStreamClosed = getFileClosedPromise(fileStream)

    try {
      // Get the archive URL using the GitHub REST API
      core.info('Getting archive URL from GitHub REST API')
      const octokit = new github.GitHub(accessToken)
      const params: RequestOptions & ReposGetArchiveLinkParams = {
        method: 'HEAD',
        archive_format: IS_WINDOWS ? 'zipball' : 'tarball',
        owner: owner,
        repo: repo,
        ref: refHelper.getDownloadRef(ref, commit)
      }
      const response = await octokit.repos.getArchiveLink(params)
      if (response.status != 302) {
        throw new Error(
          `Unexpected response from GitHub API. Status: '${response.status}'`
        )
      }
      const archiveUrl = response.headers['Location'] // Do not print the archive URL because it has an embedded token
      assert.ok(
        archiveUrl,
        `Expected GitHub API response to contain 'Location' header`
      )

      // Download the archive
      core.info('Downloading the archive') // Do not print the archive URL because it has an embedded token
      await downloadFile(archiveUrl, fileStream)
    } finally {
      await fileStreamClosed
    }

    // return Buffer.from(response.data) // response.data is ArrayBuffer
  })

  // // Download the archive
  // core.info('Downloading the archive') // Do not print the URL since it contains a token to download the archive
  // await downloadFile(archiveUrl, archivePath)

  // // console.log(`status=${response.status}`)
  // // console.log(`headers=${JSON.stringify(response.headers)}`)
  // // console.log(`data=${response.data}`)
  // // console.log(`data=${JSON.stringify(response.data)}`)
  // // for (const key of Object.keys(response.data)) {
  // //   console.log(`data['${key}']=${response.data[key]}`)
  // // }

  // // Write archive to file
  // const runnerTemp = process.env['RUNNER_TEMP'] as string
  // assert.ok(runnerTemp, 'RUNNER_TEMP not defined')
  // const archivePath = path.join(runnerTemp, 'checkout.tar.gz')
  // await io.rmRF(archivePath)
  // await fs.promises.writeFile(archivePath, raw)
  // // await exec.exec(`ls -la "${archiveFile}"`, [], {
  // //   cwd: repositoryPath
  // // } as ExecOptions)

  // Extract archive
  const extractPath = path.join(
    runnerTemp,
    `checkout-archive${IS_WINDOWS ? '.zip' : '.tar.gz'}`
  )
  await io.rmRF(extractPath)
  await io.mkdirP(extractPath)
  if (IS_WINDOWS) {
    await toolCache.extractZip(archivePath, extractPath)
  } else {
    await toolCache.extractTar(archivePath, extractPath)
  }
  // await exec.exec(`tar -xzf "${archiveFile}"`, [], {
  //   cwd: extractPath
  // } as ExecOptions)

  // Determine the real directory to copy (ignore extra dir at root of the archive)
  const archiveFileNames = await fs.promises.readdir(extractPath)
  assert.ok(
    archiveFileNames.length == 1,
    'Expected exactly one directory inside archive'
  )
  const extraDirectoryName = archiveFileNames[0]
  core.info(`Resolved ${extraDirectoryName}`) // contains the short SHA
  const tempRepositoryPath = path.join(extractPath, extraDirectoryName)

  // Move the files
  for (const fileName of await fs.promises.readdir(tempRepositoryPath)) {
    const sourcePath = path.join(tempRepositoryPath, fileName)
    const targetPath = path.join(repositoryPath, fileName)
    await io.mv(sourcePath, targetPath)
  }

  await exec.exec(`find .`, [], {
    cwd: repositoryPath
  } as ExecOptions)
}

function downloadFile(url: string, fileStream: WriteStream): Promise<void> {
  return new Promise((resolve, reject) => {
    try {
      https.get(url, (response: IncomingMessage) => {
        if (response.statusCode != 200) {
          reject(`Request failed with status '${response.statusCode}'`)
          response.resume() // Consume response data to free up memory
          return
        }

        response.on('data', chunk => {
          fileStream.write(chunk)
        })
        response.on('end', () => {
          resolve()
        })
        response.on('error', err => {
          reject(err)
        })
        // response.pipe(fileStream)
      })
    } catch (err) {
      reject(err)
    }
  })
}

function getFileClosedPromise(stream: WriteStream): Promise<void> {
  return new Promise((resolve, reject) => {
    stream.on('error', err => {
      reject(err)
    })
    stream.on('finish', () => {
      resolve()
    })
  })
}