%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(httpc_response).
-include_lib("inets/src/http_lib/http_internal.hrl").
-include("httpc_internal.hrl").
%% API
%% Avoid warning for local function error/2 clashing with autoimported BIF.
-compile({no_auto_import,[error/2]}).
-export([parse/1, result/2, send/2, error/2, is_server_closing/1,
stream_start/3]).
%% Callback API - used for example if the header/body is received a
%% little at a time on a socket.
-export([parse_version/1, parse_status_code/1, parse_reason_phrase/1,
parse_headers/1, whole_body/1, whole_body/2]).
%%%=========================================================================
%%% API
%%%=========================================================================
parse([Bin, MaxHeaderSize, Relaxed]) ->
parse_version(Bin, [], MaxHeaderSize, [], Relaxed).
whole_body([Bin, Body, Length]) ->
whole_body(<<Body/binary, Bin/binary>>, Length).
%% Functions that may be returned during the decoding process
%% if the input data is incompleate.
parse_version([Bin, Version, MaxHeaderSize, Result, Relaxed]) ->
parse_version(Bin, Version, MaxHeaderSize, Result, Relaxed).
parse_status_code([Bin, Code, MaxHeaderSize, Result, Relaxed]) ->
parse_status_code(Bin, Code, MaxHeaderSize, Result, Relaxed).
parse_reason_phrase([Bin, Rest, Phrase, MaxHeaderSize, Result, Relaxed]) ->
parse_reason_phrase(<<Rest/binary, Bin/binary>>, Phrase,
MaxHeaderSize, Result, Relaxed).
parse_headers([Bin, Rest,Header, Headers, MaxHeaderSize, Result, Relaxed]) ->
parse_headers(<<Rest/binary, Bin/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed).
whole_body(Body, Length) ->
case size(Body) of
N when (N < Length) andalso (N > 0) ->
{?MODULE, whole_body, [Body, Length]};
%% OBS! The Server may close the connection to indicate that the
%% whole body is now sent instead of sending a lengh
%% indicator.In this case the lengh indicator will be
%% -1.
N when (N >= Length) andalso (Length >= 0) ->
%% Potential trailing garbage will be thrown away in
%% format_response/1 Some servers may send a 100-continue
%% response without the client requesting it through an
%% expect header in this case the trailing bytes may be
%% part of the real response message.
{ok, Body};
_ -> %% Length == -1
{?MODULE, whole_body, [Body, Length]}
end.
%%-------------------------------------------------------------------------
%% result(Response, Request) ->
%% Response - {StatusLine, Headers, Body}
%% Request - #request{}
%% Session - #tcp_session{}
%%
%% Description: Checks the status code ...
%%-------------------------------------------------------------------------
result(Response = {{_, Code,_}, _, _},
Request = #request{stream = Stream})
when ((Code =:= 200) orelse (Code =:= 206)) andalso (Stream =/= none) ->
stream_end(Response, Request);
result(Response = {{_,100,_}, _, _}, Request) ->
status_continue(Response, Request);
%% In redirect loop
result(Response = {{_, Code, _}, _, _}, Request =
#request{redircount = Redirects,
settings = #http_options{autoredirect = true}})
when ((Code div 100) =:= 3) andalso (Redirects > ?HTTP_MAX_REDIRECTS) ->
transparent(Response, Request);
%% multiple choices
result(Response = {{_, 300, _}, _, _},
Request = #request{settings =
#http_options{autoredirect =
true}}) ->
redirect(Response, Request);
result(Response = {{_, Code, _}, _, _},
Request = #request{settings =
#http_options{autoredirect = true},
method = post}) when (Code =:= 301) orelse
(Code =:= 302) orelse
(Code =:= 303) ->
redirect(Response, Request#request{method = get});
result(Response = {{_, Code, _}, _, _},
Request = #request{settings =
#http_options{autoredirect = true},
method = post}) when (Code =:= 307) ->
redirect(Response, Request);
result(Response = {{_, Code, _}, _, _},
Request = #request{settings =
#http_options{autoredirect = true},
method = Method}) when (Code =:= 301) orelse
(Code =:= 302) orelse
(Code =:= 303) orelse
(Code =:= 307) ->
case lists:member(Method, [get, head, options, trace]) of
true ->
redirect(Response, Request);
false ->
transparent(Response, Request)
end;
result(Response = {{_,503,_}, _, _}, Request) ->
status_service_unavailable(Response, Request);
result(Response = {{_,Code,_}, _, _}, Request) when (Code div 100) =:= 5 ->
status_server_error_50x(Response, Request);
result(Response, Request) ->
transparent(Response, Request).
send(Receiver, Msg) when is_pid(Receiver) ->
Receiver ! {http, Msg};
send(Receiver, Msg) when is_function(Receiver) ->
(catch Receiver(Msg));
send({Module, Function, Args}, Msg) ->
(catch apply(Module, Function, [Msg | Args])).
%%%========================================================================
%%% Internal functions
%%%========================================================================
parse_version(<<>>, Version, MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_version, [Version, MaxHeaderSize,Result, Relaxed]};
parse_version(<<?SP, Rest/binary>>, Version,
MaxHeaderSize, Result, Relaxed) ->
case lists:reverse(Version) of
"HTTP/" ++ _ = Newversion ->
parse_status_code(Rest, [], MaxHeaderSize,
[Newversion | Result], Relaxed);
NewVersion ->
throw({error, {invalid_version, NewVersion}})
end;
parse_version(<<Octet, Rest/binary>>, Version,
MaxHeaderSize, Result, Relaxed) ->
parse_version(Rest, [Octet | Version], MaxHeaderSize,Result, Relaxed).
parse_status_code(<<>>, StatusCodeStr, MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_status_code,
[StatusCodeStr, MaxHeaderSize, Result, Relaxed]};
%% Some Apache servers has been known to leave out the reason phrase,
%% in relaxed mode we will allow this.
parse_status_code(<<?CR>> = Data, StatusCodeStr,
MaxHeaderSize, Result, true) ->
{?MODULE, parse_status_code,
[Data, StatusCodeStr, MaxHeaderSize, Result, true]};
parse_status_code(<<?LF>>, StatusCodeStr,
MaxHeaderSize, Result, true) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_status_code(<<?CR, ?LF>>, StatusCodeStr,
MaxHeaderSize, Result, true);
parse_status_code(<<?CR, ?LF, Rest/binary>>, StatusCodeStr,
MaxHeaderSize, Result, true) ->
parse_headers(Rest, [], [], MaxHeaderSize,
[" ", list_to_integer(lists:reverse(
string:strip(StatusCodeStr)))
| Result], true);
parse_status_code(<<?SP, Rest/binary>>, StatusCodeStr,
MaxHeaderSize, Result, Relaxed) ->
parse_reason_phrase(Rest, [], MaxHeaderSize,
[list_to_integer(lists:reverse(StatusCodeStr)) |
Result], Relaxed);
parse_status_code(<<Octet, Rest/binary>>, StatusCodeStr,
MaxHeaderSize,Result, Relaxed) ->
parse_status_code(Rest, [Octet | StatusCodeStr], MaxHeaderSize, Result,
Relaxed).
parse_reason_phrase(<<>>, Phrase, MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_reason_phrase,
[<<>>, Phrase, MaxHeaderSize, Result, Relaxed]};
parse_reason_phrase(<<?CR, ?LF, ?LF, Body/binary>>, Phrase,
MaxHeaderSize, Result, Relaxed) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_reason_phrase(<<?CR, ?LF, ?CR, ?LF, Body/binary>>, Phrase,
MaxHeaderSize, Result, Relaxed);
parse_reason_phrase(<<?CR, ?LF, ?CR, ?LF, Body/binary>>, Phrase,
_, Result, _) ->
ResponseHeaderRcord =
http_response:headers([], #http_response_h{}),
{ok, list_to_tuple(
lists:reverse([Body, ResponseHeaderRcord |
[lists:reverse(Phrase) | Result]]))};
parse_reason_phrase(<<?CR, ?LF, ?CR>> = Data, Phrase, MaxHeaderSize, Result,
Relaxed) ->
{?MODULE, parse_reason_phrase, [Data, Phrase, MaxHeaderSize, Result],
Relaxed};
parse_reason_phrase(<<?CR, ?LF>> = Data, Phrase, MaxHeaderSize, Result,
Relaxed) ->
{?MODULE, parse_reason_phrase, [Data, Phrase, MaxHeaderSize, Result,
Relaxed]};
parse_reason_phrase(<<?LF, Rest/binary>>, Phrase,
MaxHeaderSize, Result, Relaxed) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_reason_phrase(<<?CR, ?LF, Rest/binary>>, Phrase,
MaxHeaderSize, Result, Relaxed);
parse_reason_phrase(<<?CR, ?LF, Rest/binary>>, Phrase,
MaxHeaderSize, Result, Relaxed) ->
parse_headers(Rest, [], [], MaxHeaderSize,
[lists:reverse(Phrase) | Result], Relaxed);
parse_reason_phrase(<<?LF>>, Phrase, MaxHeaderSize, Result, Relaxed) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_reason_phrase(<<?CR, ?LF>>, Phrase, MaxHeaderSize, Result,
Relaxed);
parse_reason_phrase(<<?CR>> = Data, Phrase, MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_reason_phrase,
[Data, Phrase, MaxHeaderSize, Result, Relaxed]};
parse_reason_phrase(<<Octet, Rest/binary>>, Phrase, MaxHeaderSize, Result,
Relaxed) ->
parse_reason_phrase(Rest, [Octet | Phrase], MaxHeaderSize,
Result, Relaxed).
parse_headers(<<>>, Header, Headers, MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_headers, [<<>>, Header, Headers, MaxHeaderSize, Result,
Relaxed]};
parse_headers(<<?CR,?LF,?LF,Body/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed);
parse_headers(<<?LF,?LF,Body/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed);
parse_headers(<<?CR,?LF,?CR,?LF,Body/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
HTTPHeaders = [lists:reverse(Header) | Headers],
Length = lists:foldl(fun(H, Acc) -> length(H) + Acc end,
0, HTTPHeaders),
case ((Length =< MaxHeaderSize) or (MaxHeaderSize == nolimit)) of
true ->
ResponseHeaderRcord =
http_response:headers(HTTPHeaders, #http_response_h{}),
%% RFC7230, Section 3.3.3
%% If a message is received with both a Transfer-Encoding and a
%% Content-Length header field, the Transfer-Encoding overrides the
%% Content-Length. Such a message might indicate an attempt to
%% perform request smuggling (Section 9.5) or response splitting
%% (Section 9.4) and ought to be handled as an error. A sender MUST
%% remove the received Content-Length field prior to forwarding such
%% a message downstream.
case ResponseHeaderRcord#http_response_h.'transfer-encoding' of
undefined ->
{ok, list_to_tuple(
lists:reverse([Body, ResponseHeaderRcord | Result]))};
Value ->
TransferEncoding = string:lowercase(Value),
ContentLength = ResponseHeaderRcord#http_response_h.'content-length',
if
%% Respond without error but remove Content-Length field in relaxed mode
(Relaxed =:= true)
andalso (TransferEncoding =:= "chunked")
andalso (ContentLength =/= "-1") ->
ResponseHeaderRcordFixed =
ResponseHeaderRcord#http_response_h{'content-length' = "-1"},
{ok, list_to_tuple(
lists:reverse([Body, ResponseHeaderRcordFixed | Result]))};
%% Respond with error in default (not relaxed) mode
(Relaxed =:= false)
andalso (TransferEncoding =:= "chunked")
andalso (ContentLength =/= "-1") ->
throw({error, {headers_conflict, {'content-length',
'transfer-encoding'}}});
true ->
{ok, list_to_tuple(
lists:reverse([Body, ResponseHeaderRcord | Result]))}
end
end;
false ->
throw({error, {header_too_long, MaxHeaderSize,
MaxHeaderSize-Length}})
end;
parse_headers(<<?CR,?LF,?CR>> = Data, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_headers, [Data, Header, Headers,
MaxHeaderSize, Result, Relaxed]};
parse_headers(<<?CR,?LF>> = Data, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_headers, [Data, Header, Headers, MaxHeaderSize,
Result, Relaxed]};
parse_headers(<<?CR,?LF, Octet, Rest/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
parse_headers(Rest, [Octet],
[lists:reverse(Header) | Headers], MaxHeaderSize,
Result, Relaxed);
parse_headers(<<?CR>> = Data, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
{?MODULE, parse_headers, [Data, Header, Headers, MaxHeaderSize,
Result, Relaxed]};
parse_headers(<<?LF>>, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
%% If ?CR is is missing RFC2616 section-19.3
parse_headers(<<?CR, ?LF>>, Header, Headers,
MaxHeaderSize, Result, Relaxed);
parse_headers(<<Octet, Rest/binary>>, Header, Headers,
MaxHeaderSize, Result, Relaxed) ->
parse_headers(Rest, [Octet | Header], Headers, MaxHeaderSize,
Result, Relaxed).
%% RFC2616, Section 10.1.1
%% Note:
%% - Only act on the 100 status if the request included the
%% "Expect:100-continue" header, otherwise just ignore this response.
status_continue(_, #request{headers =
#http_request_h{expect = "100-continue"}}) ->
continue;
status_continue({_,_, Data}, _) ->
%% The data in the body in this case is actually part of the real
%% response sent after the "fake" 100-continue.
{ignore, Data}.
status_service_unavailable(Response = {_, Headers, _}, Request) ->
case Headers#http_response_h.'retry-after' of
undefined ->
status_server_error_50x(Response, Request);
Time when (length(Time) < 3) -> % Wait only 99 s or less
NewTime = list_to_integer(Time) * 1000, % time in ms
{_, Data} = format_response(Response),
{retry, {NewTime, Request}, Data};
_ ->
status_server_error_50x(Response, Request)
end.
status_server_error_50x(Response, Request) ->
{Msg, _} = format_response(Response),
{stop, {Request#request.id, Msg}}.
redirect(Response = {StatusLine, Headers, Body}, Request) ->
{_, Data} = format_response(Response),
case Headers#http_response_h.location of
undefined ->
transparent(Response, Request);
RedirUrl ->
UrlParseOpts = [{ipv6_host_with_brackets,
Request#request.ipv6_host_with_brackets}],
case uri_parse(RedirUrl, UrlParseOpts) of
{error, no_scheme} when
(Request#request.settings)#http_options.relaxed ->
NewLocation = fix_relative_uri(Request, RedirUrl),
redirect({StatusLine, Headers#http_response_h{
location = NewLocation},
Body}, Request);
{error, Reason} ->
{ok, error(Request, Reason), Data};
%% Automatic redirection
{ok, {Scheme, _, Host, Port, Path, Query}} ->
HostPort = http_request:normalize_host(Scheme, Host, Port),
NewHeaders =
(Request#request.headers)#http_request_h{host = HostPort},
NewRequest =
Request#request{redircount =
Request#request.redircount+1,
scheme = Scheme,
headers = NewHeaders,
address = {Host,Port},
path = Path,
pquery = Query,
abs_uri =
atom_to_list(Scheme) ++ "://" ++
Host ++ ":" ++
integer_to_list(Port) ++
Path ++ Query},
{redirect, NewRequest, Data}
end
end.
maybe_to_list(Port) when is_integer(Port) ->
integer_to_list(Port);
maybe_to_list(Port) when is_list(Port) ->
Port.
%%% Guessing that we received a relative URI, fix it to become an absoluteURI
fix_relative_uri(Request, RedirUrl) ->
{Server, Port0} = Request#request.address,
Port = maybe_to_list(Port0),
Path = Request#request.path,
atom_to_list(Request#request.scheme) ++ "://" ++ Server ++ ":" ++ Port
++ Path ++ RedirUrl.
error(#request{id = Id}, Reason) ->
{Id, {error, Reason}}.
transparent(Response, Request) ->
{Msg, Data} = format_response(Response),
{ok, {Request#request.id, Msg}, Data}.
stream_start(Headers, Request, ignore) ->
{Request#request.id, stream_start, http_response:header_list(Headers)};
stream_start(Headers, Request, Pid) ->
{Request#request.id, stream_start,
http_response:header_list(Headers), Pid}.
stream_end(Response, Request = #request{stream = Self})
when (Self =:= self) orelse (Self =:= {self, once}) ->
{{_, Headers, _}, Data} = format_response(Response),
{ok, {Request#request.id, stream_end, Headers}, Data};
stream_end(Response, Request) ->
{_, Data} = format_response(Response),
{ok, {Request#request.id, saved_to_file}, Data}.
is_server_closing(Headers) when is_record(Headers, http_response_h) ->
case Headers#http_response_h.connection of
"close" ->
true;
_ ->
false
end.
format_response({{"HTTP/0.9", _, _} = StatusLine, _, Body}) ->
{{StatusLine, [], Body}, <<>>};
format_response({StatusLine, Headers, Body = <<>>}) ->
{{StatusLine, http_response:header_list(Headers), Body}, <<>>};
format_response({StatusLine, Headers, Body}) ->
Length = list_to_integer(Headers#http_response_h.'content-length'),
{NewBody, Data} =
case Length of
-1 -> % When no length indicator is provided
{Body, <<>>};
Length when (Length =< size(Body)) ->
<<BodyThisReq:Length/binary, Next/binary>> = Body,
{BodyThisReq, Next};
_ -> %% Connection prematurely ended.
{Body, <<>>}
end,
{{StatusLine, http_response:header_list(Headers), NewBody}, Data}.
%%--------------------------------------------------------------------------
%% These functions is just simple wrappers to parse specifically HTTP URIs
%%--------------------------------------------------------------------------
scheme_defaults() ->
[{http, 80}, {https, 443}].
uri_parse(URI, Opts) ->
http_uri:parse(URI, [{scheme_defaults, scheme_defaults()} | Opts]).
%%--------------------------------------------------------------------------
