Module: Utils::Curl Private

Included in:
CurlDownloadStrategy, SPDX, SPDX, SharedAudits, SharedAudits
Defined in:
brew/Library/Homebrew/utils/curl.rb

Overview

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

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. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 97

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, show_output: false, user_agent: :default) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 24

def curl_args(*extra_args, show_output: false, user_agent: :default)
  args = []

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

  args << "--globoff"

  args << "--show-error"

  args << "--user-agent" << case user_agent
  when :browser, :fake
    HOMEBREW_USER_AGENT_FAKE_SAFARI
  when :default
    HOMEBREW_USER_AGENT_CURL
  else
    user_agent
  end

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

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

  args << "--retry" << Homebrew::EnvConfig.curl_retries

  args + extra_args
end

.curl_check_http_content(url, user_agents: [:default], check_content: false, strict: false) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 153

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

  details = nil
  user_agent = nil
  hash_needed = url.start_with?("http:")
  user_agents.each do |ua|
    details = curl_http_content_headers_and_checksum(url, hash_needed: hash_needed, user_agent: ua)
    user_agent = ua
    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 #{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 #{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 #{url} redirects back to HTTP"
  end

  return unless hash_needed

  secure_url = url.sub "http", "https"
  secure_details =
    curl_http_content_headers_and_checksum(secure_url, hash_needed: true, user_agent: user_agent)

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

  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 #{url} should use HTTPS rather than HTTP"
  end

  return unless check_content

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

  # Check for the same content after removing all protocols
  if (details[:file] == secure_details[:file]) &&
     secure_details[:final_url].start_with?("https://") &&
     url.start_with?("http://")
    return "The URL #{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 details[:file].length == secure_details[:file].length
    return "The URL #{url} may be able to use HTTPS rather than HTTP. Please verify it in a browser."
  end

  lenratio = (100 * secure_details[:file].length / details[:file].length).to_i
  return unless (90..110).cover?(lenratio)

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

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

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 103

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

  if partial
    range_stdout = curl_output("--location", "--range", "0-1",
                               "--dump-header", "-",
                               "--write-out", "%\{http_code}",
                               "--output", "/dev/null", *args, **options).stdout
    headers, _, http_status = range_stdout.partition("\r\n\r\n")

    supports_partial_download = http_status.to_i == 206 # Partial Content
    if supports_partial_download &&
       destination.exist? &&
       destination.size == %r{^.*Content-Range: bytes \d+-\d+/(\d+)\r\n.*$}m.match(headers)&.[](1)&.to_i
      return # We've already downloaded all the bytes
    end
  else
    supports_partial_download = false
  end

  continue_at = if destination.exist? && supports_partial_download
    "-"
  else
    0
  end

  curl(
    "--location", "--remote-time", "--continue-at", continue_at.to_s, "--output", destination, *args, **options
  )
end

.curl_executable ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 13

def curl_executable
  @curl ||= [
    ENV["HOMEBREW_CURL"],
    which("curl"),
    "/usr/bin/curl",
  ].compact.map { |c| Pathname(c) }.find(&:executable?)
  raise "no executable curl was found" unless @curl

  @curl
end

.curl_http_content_headers_and_checksum(url, hash_needed: false, user_agent: :default) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 234

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

  max_time = hash_needed ? "600" : "25"
  output, = curl_output(
    "--dump-header", "-", "--output", file.path, "--include", "--location",
    "--connect-timeout", "15", "--max-time", max_time, url,
    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

  output_hash = Digest::SHA256.file(file.path) if hash_needed

  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:      output_hash,
    file:           output,
  }
ensure
  file.unlink
end

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

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 135

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

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

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'brew/Library/Homebrew/utils/curl.rb', line 57

def curl_with_workarounds(
  *args, secrets: nil, print_stdout: nil, print_stderr: nil, verbose: nil, env: {}, **options
)
  command_options = {
    secrets:      secrets,
    print_stdout: print_stdout,
    print_stderr: print_stderr,
    verbose:      verbose,
  }.compact

  # SSL_CERT_FILE can be incorrectly set by users or portable-ruby and screw
  # with SSL downloads so unset it here.
  result = system_command curl_executable,
                          args: curl_args(*args, **options),
                          env:  { "SSL_CERT_FILE" => nil }.merge(env),
                          **command_options

  if !result.success? && !args.include?("--http1.1")
    # 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

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

  result
end

.http_status_ok?(status) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'brew/Library/Homebrew/utils/curl.rb', line 270

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

.url_protected_by_cloudflare?(details) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

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

Returns:

  • (Boolean) 


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# File 'brew/Library/Homebrew/utils/curl.rb', line 140

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

.url_protected_by_incapsula?(details) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

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

Returns:

  • (Boolean) 


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# File 'brew/Library/Homebrew/utils/curl.rb', line 147

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