mirror of
https://github.com/lunaisnotaboy/mastodon.git
synced 2024-08-18 22:14:46 +00:00
209 lines
5.3 KiB
Ruby
209 lines
5.3 KiB
Ruby
# frozen_string_literal: true
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require 'ipaddr'
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require 'socket'
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require 'resolv'
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# Monkey-patch the HTTP.rb timeout class to avoid using a timeout block
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# around the Socket#open method, since we use our own timeout blocks inside
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# that method
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class HTTP::Timeout::PerOperation
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def connect(socket_class, host, port, nodelay = false)
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@socket = socket_class.open(host, port)
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@socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1) if nodelay
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end
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end
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class Request
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REQUEST_TARGET = '(request-target)'
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include RoutingHelper
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def initialize(verb, url, **options)
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raise ArgumentError if url.blank?
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@verb = verb
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@url = Addressable::URI.parse(url).normalize
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@options = options.merge(use_proxy? ? Rails.configuration.x.http_client_proxy : { socket_class: Socket })
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@headers = {}
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raise Mastodon::HostValidationError, 'Instance does not support hidden service connections' if block_hidden_service?
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set_common_headers!
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set_digest! if options.key?(:body)
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end
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def on_behalf_of(account, key_id_format = :acct, sign_with: nil)
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raise ArgumentError unless account.local?
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@account = account
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@keypair = sign_with.present? ? OpenSSL::PKey::RSA.new(sign_with) : @account.keypair
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@key_id_format = key_id_format
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self
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end
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def add_headers(new_headers)
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@headers.merge!(new_headers)
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self
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end
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def perform
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begin
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response = http_client.headers(headers).public_send(@verb, @url.to_s, @options)
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rescue => e
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raise e.class, "#{e.message} on #{@url}", e.backtrace[0]
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end
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begin
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yield response.extend(ClientLimit) if block_given?
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ensure
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http_client.close
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end
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end
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def headers
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(@account ? @headers.merge('Signature' => signature) : @headers).without(REQUEST_TARGET)
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end
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class << self
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def valid_url?(url)
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begin
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parsed_url = Addressable::URI.parse(url)
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rescue Addressable::URI::InvalidURIError
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return false
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end
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%w(http https).include?(parsed_url.scheme) && parsed_url.host.present?
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end
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end
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private
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def set_common_headers!
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@headers[REQUEST_TARGET] = "#{@verb} #{@url.path}"
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@headers['User-Agent'] = Mastodon::Version.user_agent
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@headers['Host'] = @url.host
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@headers['Date'] = Time.now.utc.httpdate
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@headers['Accept-Encoding'] = 'gzip' if @verb != :head
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end
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def set_digest!
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@headers['Digest'] = "SHA-256=#{Digest::SHA256.base64digest(@options[:body])}"
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end
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def signature
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algorithm = 'rsa-sha256'
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signature = Base64.strict_encode64(@keypair.sign(OpenSSL::Digest::SHA256.new, signed_string))
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"keyId=\"#{key_id}\",algorithm=\"#{algorithm}\",headers=\"#{signed_headers.keys.join(' ').downcase}\",signature=\"#{signature}\""
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end
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def signed_string
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signed_headers.map { |key, value| "#{key.downcase}: #{value}" }.join("\n")
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end
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def signed_headers
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@headers.without('User-Agent', 'Accept-Encoding')
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end
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def key_id
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case @key_id_format
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when :acct
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@account.to_webfinger_s
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when :uri
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[ActivityPub::TagManager.instance.uri_for(@account), '#main-key'].join
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end
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end
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def timeout
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# We enforce a 1s timeout on DNS resolving, 10s timeout on socket opening
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# and 5s timeout on the TLS handshake, meaning the worst case should take
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# about 16s in total
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{ connect: 5, read: 10, write: 10 }
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end
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def http_client
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@http_client ||= HTTP.use(:auto_inflate).timeout(:per_operation, timeout).follow(max_hops: 2)
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end
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def use_proxy?
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Rails.configuration.x.http_client_proxy.present?
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end
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def block_hidden_service?
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!Rails.configuration.x.access_to_hidden_service && /\.(onion|i2p)$/.match(@url.host)
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end
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module ClientLimit
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def body_with_limit(limit = 1.megabyte)
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raise Mastodon::LengthValidationError if content_length.present? && content_length > limit
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if charset.nil?
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encoding = Encoding::BINARY
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else
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begin
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encoding = Encoding.find(charset)
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rescue ArgumentError
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encoding = Encoding::BINARY
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end
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end
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contents = String.new(encoding: encoding)
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while (chunk = readpartial)
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contents << chunk
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chunk.clear
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raise Mastodon::LengthValidationError if contents.bytesize > limit
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end
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contents
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end
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end
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class Socket < TCPSocket
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class << self
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def open(host, *args)
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return super(host, *args) if thru_hidden_service?(host)
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outer_e = nil
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Resolv::DNS.open do |dns|
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dns.timeouts = 1
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addresses = dns.getaddresses(host).take(2)
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time_slot = 10.0 / addresses.size
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addresses.each do |address|
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begin
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raise Mastodon::HostValidationError if PrivateAddressCheck.private_address?(IPAddr.new(address.to_s))
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::Timeout.timeout(time_slot, HTTP::TimeoutError) do
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return super(address.to_s, *args)
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end
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rescue => e
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outer_e = e
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end
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end
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end
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if outer_e
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raise outer_e
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else
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raise SocketError, "No address for #{host}"
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end
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end
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alias new open
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def thru_hidden_service?(host)
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Rails.configuration.x.access_to_hidden_service && /\.(onion|i2p)$/.match(host)
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end
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end
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end
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private_constant :ClientLimit, :Socket
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end
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