Function downloadFile

node/postinstall.js:69–103

(url, destination, redirectCount = 0)

// Download file from URL
function downloadFile(url, destination, redirectCount = 0) {
  return new Promise((resolve, reject) => {
    if (redirectCount > 5) {
      return reject(new Error("Too many redirects while downloading file"))
    }

    const file = fs.createWriteStream(destination)
    https.get(url, (response) => {
      if (response.statusCode === 302 || response.statusCode === 301) {
        // Handle redirects
        // Close the current file and delete it
        // Then download from the new location
        file.close()
        safeUnlink(destination)
        return downloadFile(response.headers.location, destination, redirectCount + 1)
          .then(resolve)
          .catch(reject)
      }

      if (response.statusCode !== 200) {
        file.close()
        safeUnlink(destination)
        return reject(new Error(`Failed to download: ${response.statusCode} ${response.statusMessage}`))
      }

      response.pipe(file)
      file.on('finish', () => {
        file.close(resolve)
      })
    }).on('error', (err) => {
      safeUnlink(destination)
      reject(err)
    })
  })
}

// Calculate SHA-256 hash of a file
function calculateSHA256(filePath) {