Module: FileDependencies::File

Defined in:
lib/file-dependencies/file.rb

Overview

:nodoc:

Constant Summary collapse

SHA1_REGEXP = 
/(\b[0-9a-f]{40}\b)/

Class Method Summary collapse

Class Method Details

.calculate_sha1(path) ⇒ Object 



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# File 'lib/file-dependencies/file.rb', line 34

def calculate_sha1(path)
  Digest::SHA1.file(path).hexdigest
end

.download(url, target) ⇒ Object 



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# File 'lib/file-dependencies/file.rb', line 47

def download(url, target)
  uri = URI(url)
  output = ::File.join(target, ::File.basename(uri.path))
  tmp = "#{output}.tmp"
  Net::HTTP.start(uri.host, uri.port, :use_ssl => (uri.scheme == "https")) do |http|
    request = Net::HTTP::Get.new(uri.path)
    http.request(request) do |response|
      raise("HTTP fetch failed for #{url}. #{response}") unless [200, 301].include?(response.code.to_i)
      size = (response["content-length"].to_i || -1).to_f
      count = 0
      ::File.open(tmp, "w") do |fd|
        response.read_body do |chunk|
          fd.write(chunk)
          if size > 0 && $stdout.tty?
            count += chunk.bytesize
            $stdout.write(sprintf("\r%0.2f%%", count / size * 100))
          end
        end
      end
      $stdout.write("\r      \r") if $stdout.tty?
    end
  end

  ::File.rename(tmp, output)

  return output
rescue SocketError => e
  puts "Failure while downloading #{url}: #{e}"
  raise
ensure
  ::File.unlink(tmp) if ::File.exist?(tmp)
end

.fetch_file(url, sha1, target) ⇒ Object 



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# File 'lib/file-dependencies/file.rb', line 39

def fetch_file(url, sha1, target)
  puts "Downloading #{url}" if $DEBUG

  file = download(url, target)
  return file if validate_sha1(file, sha1)
end

.fetch_sha1(remote_sha1) ⇒ Object 



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# File 'lib/file-dependencies/file.rb', line 12

def fetch_sha1(remote_sha1)
  if URI(remote_sha1.to_s).scheme.nil?
    sha1 = remote_sha1
  else
    file = download(remote_sha1, Dir.tmpdir)
    sha1 = IO.read(file).gsub("\n", '')
  end
  raise("invalid SHA1 signature. Got '#{sha1}'") unless sha1.match(SHA1_REGEXP)
  sha1
end

.validate_sha1(local_file, remote_sha1) ⇒ Object 



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# File 'lib/file-dependencies/file.rb', line 24

def validate_sha1(local_file, remote_sha1)
  return true if remote_sha1 == 'none'
  sha1 = fetch_sha1(remote_sha1)
  local_sha1 = calculate_sha1(local_file)

  raise("SHA1 did not match. Expected #{sha1} but computed #{local_sha1}") if sha1 != local_sha1
  true
end