Module: Utils::Curl Private

Extended by:
T::Sig
Included in:
CurlDownloadStrategy, GitHubReleases, SPDX, SPDX, SharedAudits, SharedAudits
Defined in:
utils/curl.rb

Overview

This module is part of a private API. This module may only be used in the Homebrew/brew repository. Third parties should avoid using this module if possible, as it may be removed or changed without warning.

Helper function for interacting with curl.

Class Method Summary collapse

Class Method Details

.curl(*args, print_stdout: true, **options) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 142

def curl(*args, print_stdout: true, **options)
  result = curl_with_workarounds(*args, print_stdout: print_stdout, **options)
  result.assert_success!
  result
end

.curl_args(*extra_args, connect_timeout: nil, max_time: nil, retries: Homebrew::EnvConfig.curl_retries.to_i, retry_max_time: nil, show_output: false, user_agent: nil) ⇒ Array<T.untyped>

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Parameters:

  • extra_args (T.untyped)
  • connect_timeout (Integer, Float, nil) (defaults to: nil)
  • max_time (Integer, Float, nil) (defaults to: nil)
  • retries (Integer, nil) (defaults to: Homebrew::EnvConfig.curl_retries.to_i)
  • retry_max_time (Integer, Float, nil) (defaults to: nil)
  • show_output (Boolean, nil) (defaults to: false)
  • user_agent (String, Symbol, nil) (defaults to: nil)

Returns:

  • (Array<T.untyped>)


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# File 'utils/curl.rb', line 40

def curl_args(
  *extra_args,
  connect_timeout: nil,
  max_time: nil,
  retries: Homebrew::EnvConfig.curl_retries.to_i,
  retry_max_time: nil,
  show_output: false,
  user_agent: nil
)
  args = []

  # do not load .curlrc unless requested (must be the first argument)
  args << "--disable" unless Homebrew::EnvConfig.curlrc?

  # echo any cookies received on a redirect
  args << "--cookie" << "/dev/null"

  args << "--globoff"

  args << "--show-error"

  args << "--user-agent" << case user_agent
  when :browser, :fake
    HOMEBREW_USER_AGENT_FAKE_SAFARI
  when :default, nil
    HOMEBREW_USER_AGENT_CURL
  when String
    user_agent
  else
    raise TypeError, ":user_agent must be :browser/:fake, :default, or a String"
  end

  args << "--header" << "Accept-Language: en"

  unless show_output == true
    args << "--fail"
    args << "--progress-bar" unless Context.current.verbose?
    args << "--verbose" if Homebrew::EnvConfig.curl_verbose?
    args << "--silent" unless $stdout.tty?
  end

  args << "--connect-timeout" << connect_timeout.round(3) if connect_timeout.present?
  args << "--max-time" << max_time.round(3) if max_time.present?

  # A non-positive integer (e.g., 0) or `nil` will omit this argument
  args << "--retry" << retries if retries&.positive?

  args << "--retry-max-time" << retry_max_time.round if retry_max_time.present?

  args + extra_args
end

.curl_check_http_content(url, url_type, specs: {}, user_agents: [:default], check_content: false, strict: false, use_homebrew_curl: false) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 202

def curl_check_http_content(url, url_type, specs: {}, user_agents: [:default],
                            check_content: false, strict: false, use_homebrew_curl: false)
  return unless url.start_with? "http"

  secure_url = url.sub(/\Ahttp:/, "https:")
  secure_details = nil
  hash_needed = false
  if url != secure_url
    user_agents.each do |user_agent|
      secure_details = begin
        curl_http_content_headers_and_checksum(
          secure_url,
          specs:             specs,
          hash_needed:       true,
          use_homebrew_curl: use_homebrew_curl,
          user_agent:        user_agent,
        )
      rescue Timeout::Error
        next
      end

      next unless http_status_ok?(secure_details[:status])

      hash_needed = true
      user_agents = [user_agent]
      break
    end
  end

  details = nil
  user_agents.each do |user_agent|
    details =
      curl_http_content_headers_and_checksum(
        url,
        specs:             specs,
        hash_needed:       hash_needed,
        use_homebrew_curl: use_homebrew_curl,
        user_agent:        user_agent,
      )
    break if http_status_ok?(details[:status])
  end

  unless details[:status]
    # Hack around https://github.com/Homebrew/brew/issues/3199
    return if MacOS.version == :el_capitan

    return "The #{url_type} #{url} is not reachable"
  end

  unless http_status_ok?(details[:status])
    return if url_protected_by_cloudflare?(details) || url_protected_by_incapsula?(details)

    return "The #{url_type} #{url} is not reachable (HTTP status code #{details[:status]})"
  end

  if url.start_with?("https://") && Homebrew::EnvConfig.no_insecure_redirect? &&
     !details[:final_url].start_with?("https://")
    return "The #{url_type} #{url} redirects back to HTTP"
  end

  return unless secure_details

  return if !http_status_ok?(details[:status]) || !http_status_ok?(secure_details[:status])

  etag_match = details[:etag] &&
               details[:etag] == secure_details[:etag]
  content_length_match =
    details[:content_length] &&
    details[:content_length] == secure_details[:content_length]
  file_match = details[:file_hash] == secure_details[:file_hash]

  if (etag_match || content_length_match || file_match) &&
     secure_details[:final_url].start_with?("https://") &&
     url.start_with?("http://")
    return "The #{url_type} #{url} should use HTTPS rather than HTTP"
  end

  return unless check_content

  no_protocol_file_contents = %r{https?:\\?/\\?/}
  http_content = details[:file]&.gsub(no_protocol_file_contents, "/")
  https_content = secure_details[:file]&.gsub(no_protocol_file_contents, "/")

  # Check for the same content after removing all protocols
  if (http_content && https_content) && (http_content == https_content) &&
     url.start_with?("http://") && secure_details[:final_url].start_with?("https://")
    return "The #{url_type} #{url} should use HTTPS rather than HTTP"
  end

  return unless strict

  # Same size, different content after normalization
  # (typical causes: Generated ID, Timestamp, Unix time)
  if http_content.length == https_content.length
    return "The #{url_type} #{url} may be able to use HTTPS rather than HTTP. Please verify it in a browser."
  end

  lenratio = (100 * https_content.length / http_content.length).to_i
  return unless (90..110).cover?(lenratio)

  "The #{url_type} #{url} may be able to use HTTPS rather than HTTP. Please verify it in a browser."
end

.curl_download(*args, to: nil, try_partial: true, **options) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 158

def curl_download(*args, to: nil, try_partial: true, **options)
  destination = Pathname(to)
  destination.dirname.mkpath

  if try_partial
    range_stdout = curl_output("--location", "--head", *args, **options).stdout
    headers = parse_headers(range_stdout.split("\r\n\r\n").first)

    # Any value for `accept-ranges` other than none indicates that the server supports partial requests.
    # Its absence indicates no support.
    supports_partial = headers.key?("accept-ranges") && headers["accept-ranges"] != "none"

    if supports_partial &&
       destination.exist? &&
       destination.size == headers["content-length"].to_i
      return # We've already downloaded all the bytes
    end
  end

  args = ["--location", "--remote-time", "--output", destination, *args]
  # continue-at shouldn't be used with servers that don't support partial requests.
  args = ["--continue-at", "-", *args] if destination.exist? && supports_partial

  curl(*args, **options)
end

.curl_executable(use_homebrew_curl: false) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 19

def curl_executable(use_homebrew_curl: false)
  return Pathname.new(ENV["HOMEBREW_BREWED_CURL_PATH"]) if use_homebrew_curl

  @curl_executable ||= HOMEBREW_SHIMS_PATH/"shared/curl"
end

.curl_http_content_headers_and_checksum(url, specs: {}, hash_needed: false, use_homebrew_curl: false, user_agent: :default) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 305

def curl_http_content_headers_and_checksum(
  url, specs: {}, hash_needed: false,
  use_homebrew_curl: false, user_agent: :default
)
  file = Tempfile.new.tap(&:close)

  # Convert specs to options. This is mostly key-value options,
  # unless the value is a boolean in which case treat as as flag.
  specs = specs.flat_map do |option, argument|
    next [] if argument == false # No flag.

    args = ["--#{option.to_s.tr("_", "-")}"]
    args << argument unless argument == true # It's a flag.
    args
  end

  max_time = hash_needed ? 600 : 25
  output, _, status = curl_output(
    *specs, "--dump-header", "-", "--output", file.path, "--location", url,
    use_homebrew_curl: use_homebrew_curl,
    connect_timeout:   15,
    max_time:          max_time,
    retry_max_time:    max_time,
    user_agent:        user_agent
  )

  status_code = :unknown
  while status_code == :unknown || status_code.to_s.start_with?("3")
    headers, _, output = output.partition("\r\n\r\n")
    status_code = headers[%r{HTTP/.* (\d+)}, 1]
    location = headers[/^Location:\s*(.*)$/i, 1]
    final_url = location.chomp if location
  end

  if status.success?
    file_contents = File.read(file.path)
    file_hash = Digest::SHA2.hexdigest(file_contents) if hash_needed
  end

  final_url ||= url

  {
    url:            url,
    final_url:      final_url,
    status:         status_code,
    etag:           headers[%r{ETag: ([wW]/)?"(([^"]|\\")*)"}, 2],
    content_length: headers[/Content-Length: (\d+)/, 1],
    headers:        headers,
    file_hash:      file_hash,
    file:           file_contents,
  }
ensure
  file.unlink
end

.curl_output(*args, **options) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 184

def curl_output(*args, **options)
  curl_with_workarounds(*args, print_stderr: false, show_output: true, **options)
end

.curl_pathObject

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 25

def curl_path
  @curl_path ||= Utils.popen_read(curl_executable, "--homebrew=print-path").chomp.presence
end

.curl_supports_tls13?Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:

  • (Boolean)


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# File 'utils/curl.rb', line 360

def curl_supports_tls13?
  @curl_supports_tls13 ||= Hash.new do |h, key|
    h[key] = quiet_system(curl_executable, "--tlsv1.3", "--head", "https://brew.sh/")
  end
  @curl_supports_tls13[ENV["HOMEBREW_CURL"]]
end

.curl_with_workarounds(*args, secrets: nil, print_stdout: nil, print_stderr: nil, debug: nil, verbose: nil, env: {}, timeout: nil, use_homebrew_curl: false, **options) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Raises:

  • (Timeout::Error)


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# File 'utils/curl.rb', line 92

def curl_with_workarounds(
  *args,
  secrets: nil, print_stdout: nil, print_stderr: nil, debug: nil,
  verbose: nil, env: {}, timeout: nil, use_homebrew_curl: false, **options
)
  end_time = Time.now + timeout if timeout

  command_options = {
    secrets:      secrets,
    print_stdout: print_stdout,
    print_stderr: print_stderr,
    debug:        debug,
    verbose:      verbose,
  }.compact

  result = system_command curl_executable(use_homebrew_curl: use_homebrew_curl),
                          args:    curl_args(*args, **options),
                          env:     env,
                          timeout: end_time&.remaining,
                          **command_options

  return result if result.success? || !args.exclude?("--http1.1")

  raise Timeout::Error, result.stderr.lines.last.chomp if timeout && result.status.exitstatus == 28

  # Error in the HTTP2 framing layer
  if result.status.exitstatus == 16
    return curl_with_workarounds(
      *args, "--http1.1",
      timeout: end_time&.remaining, **command_options, **options
    )
  end

  # This is a workaround for https://github.com/curl/curl/issues/1618.
  if result.status.exitstatus == 56 # Unexpected EOF
    out = curl_output("-V").stdout

    # If `curl` doesn't support HTTP2, the exception is unrelated to this bug.
    return result unless out.include?("HTTP2")

    # The bug is fixed in `curl` >= 7.60.0.
    curl_version = out[/curl (\d+(\.\d+)+)/, 1]
    return result if Gem::Version.new(curl_version) >= Gem::Version.new("7.60.0")

    return curl_with_workarounds(*args, "--http1.1", **command_options, **options)
  end

  result
end

.http_status_ok?(status) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:

  • (Boolean)


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# File 'utils/curl.rb', line 367

def http_status_ok?(status)
  (100..299).cover?(status.to_i)
end

.parse_headers(headers) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.



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# File 'utils/curl.rb', line 148

def parse_headers(headers)
  return {} if headers.blank?

  # Skip status code
  headers.split("\r\n")[1..].to_h do |h|
    name, content = h.split(": ")
    [name.downcase, content]
  end
end

.url_protected_by_cloudflare?(details) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Check if a URL is protected by CloudFlare (e.g. badlion.net and jaxx.io).

Returns:

  • (Boolean)


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# File 'utils/curl.rb', line 189

def url_protected_by_cloudflare?(details)
  [403, 503].include?(details[:status].to_i) &&
    details[:headers].match?(/^Set-Cookie: (__cfduid|__cf_bm)=/i) &&
    details[:headers].match?(/^Server: cloudflare/i)
end

.url_protected_by_incapsula?(details) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Check if a URL is protected by Incapsula (e.g. corsair.com).

Returns:

  • (Boolean)


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# File 'utils/curl.rb', line 196

def url_protected_by_incapsula?(details)
  details[:status].to_i == 403 &&
    details[:headers].match?(/^Set-Cookie: visid_incap_/i) &&
    details[:headers].match?(/^Set-Cookie: incap_ses_/i)
end