diff options
Diffstat (limited to 'lib/webrick/httpproxy.rb')
-rw-r--r-- | lib/webrick/httpproxy.rb | 240 |
1 files changed, 138 insertions, 102 deletions
diff --git a/lib/webrick/httpproxy.rb b/lib/webrick/httpproxy.rb index 32603e763a..49e618d4e6 100644 --- a/lib/webrick/httpproxy.rb +++ b/lib/webrick/httpproxy.rb @@ -23,6 +23,16 @@ module WEBrick alias gets read end + FakeProxyURI = Object.new + class << FakeProxyURI + def method_missing(meth, *args) + if %w(scheme host port path query userinfo).member?(meth.to_s) + return nil + end + super + end + end + class HTTPProxyServer < HTTPServer def initialize(config={}, default=Config::HTTP) super(config, default) @@ -32,7 +42,7 @@ module WEBrick def service(req, res) if req.request_method == "CONNECT" - proxy_connect(req, res) + do_CONNECT(req, res) elsif req.unparsed_uri =~ %r!^http://! proxy_service(req, res) else @@ -47,125 +57,32 @@ module WEBrick req.header.delete("proxy-authorization") end - # Some header fields shuold not be transfered. - HopByHop = %w( connection keep-alive proxy-authenticate upgrade - proxy-authorization te trailers transfer-encoding ) - ShouldNotTransfer = %w( set-cookie proxy-connection ) - def split_field(f) f ? f.split(/,\s+/).collect{|i| i.downcase } : [] end - - def choose_header(src, dst) - connections = split_field(src['connection']) - src.each{|key, value| - key = key.downcase - if HopByHop.member?(key) || # RFC2616: 13.5.1 - connections.member?(key) || # RFC2616: 14.10 - ShouldNotTransfer.member?(key) # pragmatics - @logger.debug("choose_header: `#{key}: #{value}'") - next - end - dst[key] = value - } - end - - # Net::HTTP is stupid about the multiple header fields. - # Here is workaround: - def set_cookie(src, dst) - if str = src['set-cookie'] - cookies = [] - str.split(/,\s*/).each{|token| - if /^[^=]+;/o =~ token - cookies[-1] << ", " << token - elsif /=/o =~ token - cookies << token - else - cookies[-1] << ", " << token - end - } - dst.cookies.replace(cookies) - end - end - - def set_via(h) - if @config[:ProxyVia] - if h['via'] - h['via'] << ", " << @via - else - h['via'] = @via - end - end - end - def proxy_uri(req, res) - @config[:ProxyURI] + # should return upstream proxy server's URI + return @config[:ProxyURI] end def proxy_service(req, res) # Proxy Authentication proxy_auth(req, res) - # Create Request-URI to send to the origin server - uri = req.request_uri - path = uri.path.dup - path << "?" << uri.query if uri.query - - # Choose header fields to transfer - header = Hash.new - choose_header(req, header) - set_via(header) - - # select upstream proxy server - if proxy = proxy_uri(req, res) - proxy_host = proxy.host - proxy_port = proxy.port - if proxy.userinfo - credentials = "Basic " + [proxy.userinfo].pack("m").delete("\n") - header['proxy-authorization'] = credentials - end - end - - response = nil begin - http = Net::HTTP.new(uri.host, uri.port, proxy_host, proxy_port) - http.start{ - if @config[:ProxyTimeout] - ################################## these issues are - http.open_timeout = 30 # secs # necessary (maybe bacause - http.read_timeout = 60 # secs # Ruby's bug, but why?) - ################################## - end - case req.request_method - when "GET" then response = http.get(path, header) - when "POST" then response = http.post(path, req.body || "", header) - when "HEAD" then response = http.head(path, header) - else - raise HTTPStatus::MethodNotAllowed, - "unsupported method `#{req.request_method}'." - end - } + self.send("do_#{req.request_method}", req, res) + rescue NoMethodError + raise HTTPStatus::MethodNotAllowed, + "unsupported method `#{req.request_method}'." rescue => err logger.debug("#{err.class}: #{err.message}") raise HTTPStatus::ServiceUnavailable, err.message end - - # Persistent connction requirements are mysterious for me. - # So I will close the connection in every response. - res['proxy-connection'] = "close" - res['connection'] = "close" - - # Convert Net::HTTP::HTTPResponse to WEBrick::HTTPProxy - res.status = response.code.to_i - choose_header(response, res) - set_cookie(response, res) - set_via(res) - res.body = response.body # Process contents if handler = @config[:ProxyContentHandler] handler.call(req, res) end end - - def proxy_connect(req, res) + + def do_CONNECT(req, res) # Proxy Authentication proxy_auth(req, res) @@ -245,8 +162,127 @@ module WEBrick raise HTTPStatus::EOFError end + def do_GET(req, res) + perform_proxy_request(req, res) do |http, path, header| + http.get(path, header) + end + end + + def do_HEAD(req, res) + perform_proxy_request(req, res) do |http, path, header| + http.head(path, header) + end + end + + def do_POST(req, res) + perform_proxy_request(req, res) do |http, path, header| + http.post(path, req.body || "", header) + end + end + def do_OPTIONS(req, res) res['allow'] = "GET,HEAD,POST,OPTIONS,CONNECT" end + + private + + # Some header fields shuold not be transfered. + HopByHop = %w( connection keep-alive proxy-authenticate upgrade + proxy-authorization te trailers transfer-encoding ) + ShouldNotTransfer = %w( set-cookie proxy-connection ) + def split_field(f) f ? f.split(/,\s+/).collect{|i| i.downcase } : [] end + + def choose_header(src, dst) + connections = split_field(src['connection']) + src.each{|key, value| + key = key.downcase + if HopByHop.member?(key) || # RFC2616: 13.5.1 + connections.member?(key) || # RFC2616: 14.10 + ShouldNotTransfer.member?(key) # pragmatics + @logger.debug("choose_header: `#{key}: #{value}'") + next + end + dst[key] = value + } + end + + # Net::HTTP is stupid about the multiple header fields. + # Here is workaround: + def set_cookie(src, dst) + if str = src['set-cookie'] + cookies = [] + str.split(/,\s*/).each{|token| + if /^[^=]+;/o =~ token + cookies[-1] << ", " << token + elsif /=/o =~ token + cookies << token + else + cookies[-1] << ", " << token + end + } + dst.cookies.replace(cookies) + end + end + + def set_via(h) + if @config[:ProxyVia] + if h['via'] + h['via'] << ", " << @via + else + h['via'] = @via + end + end + end + + def setup_proxy_header(req, res) + # Choose header fields to transfer + header = Hash.new + choose_header(req, header) + set_via(header) + return header + end + + def setup_upstream_proxy_authentication(req, res, header) + if upstream = proxy_uri(req, res) + if upstream.userinfo + header['proxy-authorization'] = + "Basic " + [upstream.userinfo].pack("m").delete("\n") + end + return upstream + end + return FakeProxyURI + end + + def perform_proxy_request(req, res) + uri = req.request_uri + path = uri.path.dup + path << "?" << uri.query if uri.query + header = setup_proxy_header(req, res) + upstream = setup_upstream_proxy_authentication(req, res, header) + response = nil + + http = Net::HTTP.new(uri.host, uri.port, upstream.host, upstream.port) + http.start do + if @config[:ProxyTimeout] + ################################## these issues are + http.open_timeout = 30 # secs # necessary (maybe bacause + http.read_timeout = 60 # secs # Ruby's bug, but why?) + ################################## + end + response = yield(http, path, header) + end + + # Persistent connction requirements are mysterious for me. + # So I will close the connection in every response. + res['proxy-connection'] = "close" + res['connection'] = "close" + + # Convert Net::HTTP::HTTPResponse to WEBrick::HTTPResponse + res.status = response.code.to_i + choose_header(response, res) + set_cookie(response, res) + set_via(res) + res.body = response.body + end end end |