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# frozen_string_literal: true
require 'rubygems'
require 'rubygems/request'
require 'rubygems/request/connection_pools'
require 'rubygems/s3_uri_signer'
require 'rubygems/uri_formatter'
require 'rubygems/uri_parsing'
require 'rubygems/user_interaction'
require 'resolv'
require 'rubygems/deprecate'
##
# RemoteFetcher handles the details of fetching gems and gem information from
# a remote source.
class Gem::RemoteFetcher
include Gem::UserInteraction
extend Gem::Deprecate
include Gem::UriParsing
##
# A FetchError exception wraps up the various possible IO and HTTP failures
# that could happen while downloading from the internet.
class FetchError < Gem::Exception
include Gem::UriParsing
##
# The URI which was being accessed when the exception happened.
attr_accessor :uri
def initialize(message, uri)
super message
uri = parse_uri(uri)
uri.password = 'REDACTED' if uri.respond_to?(:password) && uri.password
@uri = uri.to_s
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
attr_accessor :headers
##
# 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
#
# +headers+: A set of additional HTTP headers to be sent to the server when
# fetching the gem.
def initialize(proxy=nil, dns=nil, headers={})
require 'net/http'
require 'stringio'
require 'time'
require 'uri'
Socket.do_not_reverse_lookup = true
@proxy = proxy
@pools = {}
@pool_lock = Mutex.new
@cert_files = Gem::Request.get_cert_files
@headers = headers
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 encompassing 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
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 # see fetch_command
install_dir
elsif File.writable? install_dir
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
source_uri = parse_uri(source_uri)
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', 's3' then
unless File.exist? local_gem_path
begin
verbose "Downloading gem #{gem_file_name}"
remote_gem_path = source_uri + "gems/#{gem_file_name}"
self.cache_update_path remote_gem_path, local_gem_path
rescue FetchError
raise if spec.original_platform == spec.platform
alternate_name = "#{spec.original_name}.gem"
verbose "Failed, downloading gem #{alternate_name}"
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 = Gem::Util.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
verbose "Using local gem #{local_gem_path}"
when nil then # TODO test for local overriding cache
source_path = if Gem.win_platform? && source_uri.scheme &&
!source_uri.path.include?(':')
"#{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
verbose "Using local gem #{local_gem_path}"
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 Gem::Util.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 do |req|
headers.each { |k,v| req.add_field(k,v) }
end
case response
when Net::HTTPOK, Net::HTTPNotModified then
response.uri = uri if response.respond_to? :uri
head ? response : response.body
when Net::HTTPMovedPermanently, Net::HTTPFound, Net::HTTPSeeOther,
Net::HTTPTemporaryRedirect then
raise FetchError.new('too many redirects', uri) if depth > 10
unless location = response['Location']
raise FetchError.new("redirecting but no redirect location was given", uri)
end
location = parse_uri 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 = parse_uri 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::Util.gunzip data
rescue Zlib::GzipFile::Error
raise FetchError.new("server did not return a valid file", uri)
end
end
data
rescue Timeout::Error
raise UnknownHostError.new('timed out', uri)
rescue IOError, SocketError, SystemCallError,
*(OpenSSL::SSL::SSLError if defined?(OpenSSL)) => e
if e.message =~ /getaddrinfo/
raise UnknownHostError.new('no such name', uri)
else
raise FetchError.new("#{e.class}: #{e}", uri)
end
end
def fetch_s3(uri, mtime = nil, head = false)
begin
public_uri = s3_uri_signer(uri).sign
rescue Gem::S3URISigner::ConfigurationError, Gem::S3URISigner::InstanceProfileError => e
raise FetchError.new(e.message, "s3://#{uri.host}")
end
fetch_https public_uri, mtime, head
end
# we have our own signing code here to avoid a dependency on the aws-sdk gem
def s3_uri_signer(uri)
Gem::S3URISigner.new(uri)
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
Gem.write_binary(path, data)
end
data
end
##
# Returns the size of +uri+ in bytes.
def fetch_size(uri)
response = fetch_path(uri, nil, true)
response['content-length'].to_i
end
deprecate :fetch_size, :none, 2019, 12
##
# 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)
proxy = proxy_for @proxy, uri
pool = pools_for(proxy).pool_for uri
request = Gem::Request.new uri, request_class, last_modified, pool
request.fetch do |req|
yield req if block_given?
end
end
def https?(uri)
uri.scheme.downcase == 'https'
end
def close_all
@pools.each_value {|pool| pool.close_all}
end
private
def proxy_for(proxy, uri)
Gem::Request.proxy_uri(proxy || Gem::Request.get_proxy_from_env(uri.scheme))
end
def pools_for(proxy)
@pool_lock.synchronize do
@pools[proxy] ||= Gem::Request::ConnectionPools.new proxy, @cert_files
end
end
end
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