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ðŸ“„ request_set.rb(6.94 KB)
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Editing: remote_fetcher.rb

require 'rubygems'
require 'rubygems/request'
require 'rubygems/uri_formatter'
require 'rubygems/user_interaction'
require 'resolv'

##
# RemoteFetcher handles the details of fetching gems and gem information from
# a remote source.

class Gem::RemoteFetcher

include Gem::UserInteraction

##
  # A FetchError exception wraps up the various possible IO and HTTP failures
  # that could happen while downloading from the internet.

class FetchError < Gem::Exception

##
    # The URI which was being accessed when the exception happened.

attr_accessor :uri

def initialize(message, uri)
      super message
      @uri = uri
    end

def to_s # :nodoc:
      "#{super} (#{uri})"
    end

end

##
  # A FetchError that indicates that the reason for not being
  # able to fetch data was that the host could not be contacted

class UnknownHostError < FetchError
  end

@fetcher = nil

##
  # Cached RemoteFetcher instance.

def self.fetcher
    @fetcher ||= self.new Gem.configuration[:http_proxy]
  end

##
  # Initialize a remote fetcher using the source URI and possible proxy
  # information.
  #
  # +proxy+
  # * [String]: explicit specification of proxy; overrides any environment
  #             variable setting
  # * nil: respect environment variables (HTTP_PROXY, HTTP_PROXY_USER,
  #        HTTP_PROXY_PASS)
  # * <tt>:no_proxy</tt>: ignore environment variables and _don't_ use a proxy
  #
  # +dns+: An object to use for DNS resolution of the API endpoint.
  #        By default, use Resolv::DNS.

def initialize(proxy=nil, dns=Resolv::DNS.new)
    require 'net/http'
    require 'stringio'
    require 'time'
    require 'uri'

Socket.do_not_reverse_lookup = true

@proxy = proxy

@dns = dns
  end

##
  # Given a source at +uri+, calculate what hostname to actually
  # connect to query the data for it.

def api_endpoint(uri)
    host = uri.host

begin
      res = @dns.getresource "_rubygems._tcp.#{host}",
                             Resolv::DNS::Resource::IN::SRV
    rescue Resolv::ResolvError
      uri
    else
      target = res.target.to_s.strip

if /\.#{Regexp.quote(host)}\z/ =~ target
        return URI.parse "#{uri.scheme}://#{target}#{uri.path}"
      end

uri
    end
  end

##
  # Given a name and requirement, downloads this gem into cache and returns the
  # filename. Returns nil if the gem cannot be located.
  #--
  # Should probably be integrated with #download below, but that will be a
  # larger, more emcompassing effort. -erikh

def download_to_cache dependency
    found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dependency

return if found.empty?

spec, source = found.max_by { |(s,_)| s.version }

download spec, source.uri.to_s
  end

##
  # Moves the gem +spec+ from +source_uri+ to the cache dir unless it is
  # already there.  If the source_uri is local the gem cache dir copy is
  # always replaced.

def download(spec, source_uri, install_dir = Gem.dir)
    cache_dir =
      if Dir.pwd == install_dir then # see fetch_command
        install_dir
      elsif File.writable? install_dir then
        File.join install_dir, "cache"
      else
        File.join Gem.user_dir, "cache"
      end

gem_file_name = File.basename spec.cache_file
    local_gem_path = File.join cache_dir, gem_file_name

FileUtils.mkdir_p cache_dir rescue nil unless File.exist? cache_dir

# Always escape URI's to deal with potential spaces and such
    # It should also be considered that source_uri may already be
    # a valid URI with escaped characters. e.g. "{DESede}" is encoded
    # as "%7BDESede%7D". If this is escaped again the percentage
    # symbols will be escaped.
    unless source_uri.is_a?(URI::Generic)
      begin
        source_uri = URI.parse(source_uri)
      rescue
        source_uri = URI.parse(URI.const_defined?(:DEFAULT_PARSER) ?
                               URI::DEFAULT_PARSER.escape(source_uri.to_s) :
                               URI.escape(source_uri.to_s))
      end
    end

scheme = source_uri.scheme

# URI.parse gets confused by MS Windows paths with forward slashes.
    scheme = nil if scheme =~ /^[a-z]$/i

# REFACTOR: split this up and dispatch on scheme (eg download_http)
    # REFACTOR: be sure to clean up fake fetcher when you do this... cleaner
    case scheme
    when 'http', 'https' then
      unless File.exist? local_gem_path then
        begin
          say "Downloading gem #{gem_file_name}" if
            Gem.configuration.really_verbose

remote_gem_path = source_uri + "gems/#{gem_file_name}"

self.cache_update_path remote_gem_path, local_gem_path
        rescue Gem::RemoteFetcher::FetchError
          raise if spec.original_platform == spec.platform

alternate_name = "#{spec.original_name}.gem"

say "Failed, downloading gem #{alternate_name}" if
            Gem.configuration.really_verbose

remote_gem_path = source_uri + "gems/#{alternate_name}"

self.cache_update_path remote_gem_path, local_gem_path
        end
      end
    when 'file' then
      begin
        path = source_uri.path
        path = File.dirname(path) if File.extname(path) == '.gem'

remote_gem_path = correct_for_windows_path(File.join(path, 'gems', gem_file_name))

FileUtils.cp(remote_gem_path, local_gem_path)
      rescue Errno::EACCES
        local_gem_path = source_uri.to_s
      end

say "Using local gem #{local_gem_path}" if
        Gem.configuration.really_verbose
    when nil then # TODO test for local overriding cache
      source_path = if Gem.win_platform? && source_uri.scheme &&
                       !source_uri.path.include?(':') then
                      "#{source_uri.scheme}:#{source_uri.path}"
                    else
                      source_uri.path
                    end

source_path = Gem::UriFormatter.new(source_path).unescape

begin
        FileUtils.cp source_path, local_gem_path unless
          File.identical?(source_path, local_gem_path)
      rescue Errno::EACCES
        local_gem_path = source_uri.to_s
      end

say "Using local gem #{local_gem_path}" if
        Gem.configuration.really_verbose
    else
      raise ArgumentError, "unsupported URI scheme #{source_uri.scheme}"
    end

local_gem_path
  end

##
  # File Fetcher. Dispatched by +fetch_path+. Use it instead.

def fetch_file uri, *_
    Gem.read_binary correct_for_windows_path uri.path
  end

##
  # HTTP Fetcher. Dispatched by +fetch_path+. Use it instead.

def fetch_http uri, last_modified = nil, head = false, depth = 0
    fetch_type = head ? Net::HTTP::Head : Net::HTTP::Get
    response   = request uri, fetch_type, last_modified

case response
    when Net::HTTPOK, Net::HTTPNotModified then
      head ? response : response.body
    when Net::HTTPMovedPermanently, Net::HTTPFound, Net::HTTPSeeOther,
         Net::HTTPTemporaryRedirect then
      raise FetchError.new('too many redirects', uri) if depth > 10

location = URI.parse response['Location']

if https?(uri) && !https?(location)
        raise FetchError.new("redirecting to non-https resource: #{location}", uri)
      end

fetch_http(location, last_modified, head, depth + 1)
    else
      raise FetchError.new("bad response #{response.message} #{response.code}", uri)
    end
  end

alias :fetch_https :fetch_http

##
  # Downloads +uri+ and returns it as a String.

def fetch_path(uri, mtime = nil, head = false)
    uri = URI.parse uri unless URI::Generic === uri

raise ArgumentError, "bad uri: #{uri}" unless uri

unless uri.scheme
      raise ArgumentError, "uri scheme is invalid: #{uri.scheme.inspect}"
    end

data = send "fetch_#{uri.scheme}", uri, mtime, head

if data and !head and uri.to_s =~ /gz$/
      begin
        data = Gem.gunzip data
      rescue Zlib::GzipFile::Error
        raise FetchError.new("server did not return a valid file", uri.to_s)
      end
    end

data
  rescue FetchError
    raise
  rescue Timeout::Error
    raise UnknownHostError.new('timed out', uri.to_s)
  rescue IOError, SocketError, SystemCallError => e
    if e.message =~ /getaddrinfo/
      raise UnknownHostError.new('no such name', uri.to_s)
    else
      raise FetchError.new("#{e.class}: #{e}", uri.to_s)
    end
  end

##
  # Downloads +uri+ to +path+ if necessary. If no path is given, it just
  # passes the data.

def cache_update_path uri, path = nil, update = true
    mtime = path && File.stat(path).mtime rescue nil

data = fetch_path(uri, mtime)

if data == nil # indicates the server returned 304 Not Modified
      return Gem.read_binary(path)
    end

if update and path
      open(path, 'wb') do |io|
        io.flock(File::LOCK_EX)
        io.write data
      end
    end

data
  end

##
  # Returns the size of +uri+ in bytes.

def fetch_size(uri) # TODO: phase this out
    response = fetch_path(uri, nil, true)

response['content-length'].to_i
  end

def correct_for_windows_path(path)
    if path[0].chr == '/' && path[1].chr =~ /[a-z]/i && path[2].chr == ':'
      path = path[1..-1]
    else
      path
    end
  end

##
  # Performs a Net::HTTP request of type +request_class+ on +uri+ returning
  # a Net::HTTP response object.  request maintains a table of persistent
  # connections to reduce connect overhead.

def request(uri, request_class, last_modified = nil)
    request = Gem::Request.new uri, request_class, last_modified, @proxy

request.fetch do |req|
      yield req if block_given?
    end
  end

def https?(uri)
    uri.scheme.downcase == 'https'
  end

end

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