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chttpd.erl
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chttpd.erl
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% 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.
-module(chttpd).
-compile(tuple_calls).
-include_lib("couch/include/couch_db.hrl").
-include_lib("chttpd/include/chttpd.hrl").
-export([
start_link/0, start_link/1, start_link/2,
stop/0,
handle_request/1,
handle_request_int/1,
primary_header_value/2,
header_value/2, header_value/3,
qs_value/2,
qs_value/3,
qs/1,
qs_json_value/3,
path/1,
absolute_uri/2,
body_length/1,
verify_is_server_admin/1,
unquote/1,
quote/1,
recv/2,
recv_chunked/4,
error_info/1,
parse_form/1,
json_body/1,
json_body/2,
json_body_obj/1,
body/1,
doc_etag/1,
make_etag/1,
etag_respond/3,
etag_match/2,
partition/1,
serve_file/3, serve_file/4,
server_header/0,
start_chunked_response/3,
send_chunk/2,
start_response_length/4,
send/2,
start_json_response/2,
start_json_response/3,
end_json_response/1,
send_response/4,
send_response_no_cors/4,
send_method_not_allowed/2,
send_error/2, send_error/4,
send_redirect/2,
send_chunked_error/2,
send_json/2, send_json/3, send_json/4,
validate_ctype/2
]).
-export([authenticate_request/3]).
-export([
start_delayed_json_response/2, start_delayed_json_response/3, start_delayed_json_response/4,
start_delayed_chunked_response/3, start_delayed_chunked_response/4,
send_delayed_chunk/2,
send_delayed_last_chunk/1,
send_delayed_error/2,
end_delayed_json_response/1,
get_delayed_req/1
]).
-export([
chunked_response_buffer_size/0,
close_delayed_json_object/4
]).
-record(delayed_resp, {
start_fun,
req,
code,
headers,
chunks,
resp = nil,
buffer_response = false
}).
-define(DEFAULT_SERVER_OPTIONS, "[{recbuf, undefined}]").
-define(DEFAULT_SOCKET_OPTIONS, "[{sndbuf, 262144}, {nodelay, true}]").
start_link() ->
start_link(http).
start_link(http) ->
Port = config:get("chttpd", "port", "5984"),
start_link(?MODULE, [{port, Port}]);
start_link(https) ->
Port = config:get("ssl", "port", "6984"),
{ok, Ciphers} = couch_util:parse_term(config:get("ssl", "ciphers", "undefined")),
{ok, Versions} = couch_util:parse_term(config:get("ssl", "tls_versions", "undefined")),
{ok, SecureRenegotiate} = couch_util:parse_term(
config:get("ssl", "secure_renegotiate", "undefined")
),
ServerOpts0 =
[
{cacertfile, config:get("ssl", "cacert_file", undefined)},
{keyfile, config:get("ssl", "key_file", undefined)},
{certfile, config:get("ssl", "cert_file", undefined)},
{password, config:get("ssl", "password", undefined)},
{secure_renegotiate, SecureRenegotiate},
{versions, Versions},
{ciphers, Ciphers}
],
case
(couch_util:get_value(keyfile, ServerOpts0) == undefined orelse
couch_util:get_value(certfile, ServerOpts0) == undefined)
of
true ->
io:format("SSL enabled but PEM certificates are missing.", []),
throw({error, missing_certs});
false ->
ok
end,
ServerOpts = [Opt || {_, V} = Opt <- ServerOpts0, V /= undefined],
ClientOpts =
case config:get("ssl", "verify_ssl_certificates", "false") of
"false" ->
[];
"true" ->
FailIfNoPeerCert =
case config:get("ssl", "fail_if_no_peer_cert", "false") of
"false" -> false;
"true" -> true
end,
[
{depth,
list_to_integer(
config:get(
"ssl",
"ssl_certificate_max_depth",
"1"
)
)},
{fail_if_no_peer_cert, FailIfNoPeerCert},
{verify, verify_peer}
] ++
case config:get("ssl", "verify_fun", undefined) of
undefined -> [];
SpecStr -> [{verify_fun, couch_httpd:make_arity_3_fun(SpecStr)}]
end
end,
SslOpts = ServerOpts ++ ClientOpts,
Options0 =
[
{port, Port},
{ssl, true},
{ssl_opts, SslOpts}
],
CustomServerOpts = get_server_options("httpsd"),
Options = merge_server_options(Options0, CustomServerOpts),
start_link(https, Options).
start_link(Name, Options) ->
IP =
case config:get("chttpd", "bind_address", "any") of
"any" -> any;
Else -> Else
end,
ok = couch_httpd:validate_bind_address(IP),
set_auth_handlers(),
Options1 =
Options ++
[
{loop, fun ?MODULE:handle_request/1},
{name, Name},
{ip, IP}
],
ServerOpts = get_server_options("chttpd"),
Options2 = merge_server_options(Options1, ServerOpts),
case mochiweb_http:start(Options2) of
{ok, Pid} ->
{ok, Pid};
{error, Reason} ->
io:format("Failure to start Mochiweb: ~s~n", [Reason]),
{error, Reason}
end.
get_server_options(Module) ->
ServerOptsCfg =
case Module of
"chttpd" ->
config:get(
Module,
"server_options",
?DEFAULT_SERVER_OPTIONS
);
_ ->
config:get(Module, "server_options", "[]")
end,
{ok, ServerOpts} = couch_util:parse_term(ServerOptsCfg),
ServerOpts.
merge_server_options(A, B) ->
lists:keymerge(1, lists:sort(A), lists:sort(B)).
stop() ->
catch mochiweb_http:stop(https),
mochiweb_http:stop(?MODULE).
handle_request(MochiReq0) ->
erlang:put(?REWRITE_COUNT, 0),
MochiReq = couch_httpd_vhost:dispatch_host(MochiReq0),
handle_request_int(MochiReq).
handle_request_int(MochiReq) ->
Begin = os:timestamp(),
SocketOptsCfg = config:get(
"chttpd", "socket_options", ?DEFAULT_SOCKET_OPTIONS
),
{ok, SocketOpts} = couch_util:parse_term(SocketOptsCfg),
ok = mochiweb_socket:setopts(MochiReq:get(socket), SocketOpts),
% for the path, use the raw path with the query string and fragment
% removed, but URL quoting left intact
RawUri = MochiReq:get(raw_path),
{"/" ++ Path, _, _} = mochiweb_util:urlsplit_path(RawUri),
% get requested path
RequestedPath =
case MochiReq:get_header_value("x-couchdb-vhost-path") of
undefined ->
case MochiReq:get_header_value("x-couchdb-requested-path") of
undefined -> RawUri;
R -> R
end;
P ->
P
end,
Peer = MochiReq:get(peer),
Method1 =
case MochiReq:get(method) of
% already an atom
Meth when is_atom(Meth) -> Meth;
% Non standard HTTP verbs aren't atoms (COPY, MOVE etc) so convert when
% possible (if any module references the atom, then it's existing).
Meth -> couch_util:to_existing_atom(Meth)
end,
increment_method_stats(Method1),
% allow broken HTTP clients to fake a full method vocabulary with an X-HTTP-METHOD-OVERRIDE header
MethodOverride = MochiReq:get_primary_header_value("X-HTTP-Method-Override"),
Method2 =
case
lists:member(MethodOverride, [
"GET", "HEAD", "POST", "PUT", "DELETE", "TRACE", "CONNECT", "COPY"
])
of
true ->
couch_log:notice("MethodOverride: ~s (real method was ~s)", [
MethodOverride, Method1
]),
case Method1 of
'POST' ->
couch_util:to_existing_atom(MethodOverride);
_ ->
% Ignore X-HTTP-Method-Override when the original verb isn't POST.
% I'd like to send a 406 error to the client, but that'd require a nasty refactor.
% throw({not_acceptable, <<"X-HTTP-Method-Override may only be used with POST requests.">>})
Method1
end;
_ ->
Method1
end,
% alias HEAD to GET as mochiweb takes care of stripping the body
Method =
case Method2 of
'HEAD' -> 'GET';
Other -> Other
end,
Nonce = couch_util:to_hex(crypto:strong_rand_bytes(5)),
HttpReq0 = #httpd{
mochi_req = MochiReq,
begin_ts = Begin,
peer = Peer,
original_method = Method1,
nonce = Nonce,
method = Method,
path_parts = [
list_to_binary(unquote(Part))
|| Part <- string:tokens(Path, "/")
],
requested_path_parts = [
?l2b(unquote(Part))
|| Part <- string:tokens(RequestedPath, "/")
]
},
% put small token on heap to keep requests synced to backend calls
erlang:put(nonce, Nonce),
% suppress duplicate log
erlang:put(dont_log_request, true),
erlang:put(dont_log_response, true),
% Save client socket so that it can be monitored for disconnects
chttpd_util:mochiweb_client_req_set(MochiReq),
{HttpReq2, Response} =
case before_request(HttpReq0) of
{ok, HttpReq1} ->
process_request(HttpReq1);
{error, Response0} ->
{HttpReq0, Response0}
end,
chttpd_util:mochiweb_client_req_clean(),
{Status, Code, Reason, Resp} = split_response(Response),
HttpResp = #httpd_resp{
code = Code,
status = Status,
response = Resp,
nonce = HttpReq2#httpd.nonce,
reason = Reason
},
case after_request(HttpReq2, HttpResp) of
#httpd_resp{status = ok, response = Resp} ->
{ok, Resp};
#httpd_resp{status = aborted, reason = Reason} ->
couch_log:error("Response abnormally terminated: ~p", [Reason]),
exit({shutdown, Reason})
end.
before_request(HttpReq) ->
try
chttpd_stats:init(),
chttpd_plugin:before_request(HttpReq)
catch
ErrorType:Error:Stack ->
{error, catch_error(HttpReq, ErrorType, Error, Stack)}
end.
after_request(HttpReq, HttpResp0) ->
{ok, HttpResp1} =
try
chttpd_plugin:after_request(HttpReq, HttpResp0)
catch
_ErrorType:Error:Stack ->
send_error(HttpReq, {Error, nil, Stack}),
{ok, HttpResp0#httpd_resp{status = aborted}}
end,
HttpResp2 = update_stats(HttpReq, HttpResp1),
chttpd_stats:report(HttpReq, HttpResp2),
maybe_log(HttpReq, HttpResp2),
HttpResp2.
process_request(#httpd{mochi_req = MochiReq} = HttpReq) ->
HandlerKey =
case HttpReq#httpd.path_parts of
[] -> <<>>;
[Key | _] -> ?l2b(quote(Key))
end,
RawUri = MochiReq:get(raw_path),
try
couch_httpd:validate_host(HttpReq),
check_request_uri_length(RawUri),
check_url_encoding(RawUri),
case chttpd_cors:maybe_handle_preflight_request(HttpReq) of
not_preflight ->
case chttpd_auth:authenticate(HttpReq, fun authenticate_request/1) of
#httpd{} = Req ->
handle_req_after_auth(HandlerKey, Req);
Response ->
{HttpReq, Response}
end;
Response ->
{HttpReq, Response}
end
catch
ErrorType:Error:Stack ->
{HttpReq, catch_error(HttpReq, ErrorType, Error, Stack)}
end.
handle_req_after_auth(HandlerKey, HttpReq) ->
try
HandlerFun = chttpd_handlers:url_handler(
HandlerKey,
fun chttpd_db:handle_request/1
),
AuthorizedReq = chttpd_auth:authorize(
possibly_hack(HttpReq),
fun chttpd_auth_request:authorize_request/1
),
{AuthorizedReq, HandlerFun(AuthorizedReq)}
catch
ErrorType:Error:Stack ->
{HttpReq, catch_error(HttpReq, ErrorType, Error, Stack)}
end.
catch_error(_HttpReq, throw, {http_head_abort, Resp}, _Stack) ->
{ok, Resp};
catch_error(_HttpReq, throw, {http_abort, Resp, Reason}, _Stack) ->
{aborted, Resp, Reason};
catch_error(HttpReq, throw, {invalid_json, _}, _Stack) ->
send_error(HttpReq, {bad_request, "invalid UTF-8 JSON"});
catch_error(HttpReq, exit, {mochiweb_recv_error, E}, _Stack) ->
#httpd{
mochi_req = MochiReq,
peer = Peer,
original_method = Method
} = HttpReq,
couch_log:notice("mochiweb_recv_error for ~s - ~p ~s - ~p", [
Peer,
Method,
MochiReq:get(raw_path),
E
]),
exit({shutdown, E});
catch_error(HttpReq, exit, {uri_too_long, _}, _Stack) ->
send_error(HttpReq, request_uri_too_long);
catch_error(HttpReq, exit, {body_too_large, _}, _Stack) ->
send_error(HttpReq, request_entity_too_large);
catch_error(HttpReq, throw, Error, _Stack) ->
send_error(HttpReq, Error);
catch_error(HttpReq, error, database_does_not_exist, _Stack) ->
send_error(HttpReq, database_does_not_exist);
catch_error(HttpReq, Tag, Error, Stack) ->
% TODO improve logging and metrics collection for client disconnects
case {Tag, Error, Stack} of
{exit, normal, [{mochiweb_request, send, _, _} | _]} ->
% Client disconnect (R15+)
exit(shutdown);
{exit, {shutdown, _}, [{mochiweb_request, send, _, _} | _]} ->
% Client disconnect (R15+)
exit(shutdown);
_Else ->
send_error(HttpReq, {Error, nil, Stack})
end.
split_response({ok, #delayed_resp{resp = Resp}}) ->
{ok, Resp:get(code), undefined, Resp};
split_response({ok, Resp}) ->
{ok, Resp:get(code), undefined, Resp};
split_response({aborted, Resp, AbortReason}) ->
{aborted, Resp:get(code), AbortReason, Resp}.
update_stats(HttpReq, #httpd_resp{end_ts = undefined} = Res) ->
update_stats(HttpReq, Res#httpd_resp{end_ts = os:timestamp()});
update_stats(#httpd{begin_ts = BeginTime}, #httpd_resp{} = Res) ->
#httpd_resp{status = Status, end_ts = EndTime} = Res,
RequestTime = timer:now_diff(EndTime, BeginTime) / 1000,
couch_stats:update_histogram([couchdb, request_time], RequestTime),
case Status of
ok ->
couch_stats:increment_counter([couchdb, httpd, requests]);
aborted ->
couch_stats:increment_counter([couchdb, httpd, aborted_requests])
end,
Res.
maybe_log(#httpd{} = HttpReq, #httpd_resp{should_log = true} = HttpResp) ->
#httpd{
mochi_req = MochiReq,
begin_ts = BeginTime,
original_method = Method,
peer = Peer
} = HttpReq,
#httpd_resp{
end_ts = EndTime,
code = Code,
status = Status
} = HttpResp,
User = get_user(HttpReq),
Host = MochiReq:get_header_value("Host"),
RawUri = MochiReq:get(raw_path),
RequestTime = timer:now_diff(EndTime, BeginTime) / 1000,
couch_log:notice("~s ~s ~s ~s ~s ~B ~p ~B", [
Host,
Peer,
User,
Method,
RawUri,
Code,
Status,
round(RequestTime)
]);
maybe_log(_HttpReq, #httpd_resp{should_log = false}) ->
ok.
%% HACK: replication currently handles two forms of input, #db{} style
%% and #http_db style. We need a third that makes use of fabric. #db{}
%% works fine for replicating the dbs and nodes database because they
%% aren't sharded. So for now when a local db is specified as the source or
%% the target, it's hacked to make it a full url and treated as a remote.
possibly_hack(#httpd{path_parts = [<<"_replicate">>]} = Req) ->
{Props0} = chttpd:json_body_obj(Req),
Props1 = fix_uri(Req, Props0, <<"source">>),
Props2 = fix_uri(Req, Props1, <<"target">>),
Req#httpd{req_body = {Props2}};
possibly_hack(Req) ->
Req.
check_request_uri_length(Uri) ->
check_request_uri_length(
Uri,
chttpd_util:get_chttpd_config("max_uri_length")
).
check_request_uri_length(_Uri, undefined) ->
ok;
check_request_uri_length(Uri, MaxUriLen) when is_list(MaxUriLen) ->
case length(Uri) > list_to_integer(MaxUriLen) of
true ->
throw(request_uri_too_long);
false ->
ok
end.
check_url_encoding([]) ->
ok;
check_url_encoding([$%, A, B | Rest]) when ?is_hex(A), ?is_hex(B) ->
check_url_encoding(Rest);
check_url_encoding([$% | _]) ->
throw({bad_request, invalid_url_encoding});
check_url_encoding([_ | Rest]) ->
check_url_encoding(Rest).
fix_uri(Req, Props, Type) ->
case replication_uri(Type, Props) of
undefined ->
Props;
Uri0 ->
case is_http(Uri0) of
true ->
Props;
false ->
Uri = make_uri(Req, quote(Uri0)),
[{Type, Uri} | proplists:delete(Type, Props)]
end
end.
replication_uri(Type, PostProps) ->
case couch_util:get_value(Type, PostProps) of
{Props} ->
couch_util:get_value(<<"url">>, Props);
Else ->
Else
end.
is_http(<<"http://", _/binary>>) ->
true;
is_http(<<"https://", _/binary>>) ->
true;
is_http(_) ->
false.
make_uri(Req, Raw) ->
Port = integer_to_list(mochiweb_socket_server:get(chttpd, port)),
Url = list_to_binary([
"http://",
config:get("chttpd", "bind_address"),
":",
Port,
"/",
Raw
]),
Headers = [
{<<"authorization">>, ?l2b(header_value(Req, "authorization", ""))},
{<<"cookie">>, ?l2b(extract_cookie(Req))}
],
{[{<<"url">>, Url}, {<<"headers">>, {Headers}}]}.
extract_cookie(#httpd{mochi_req = MochiReq}) ->
case MochiReq:get_cookie_value("AuthSession") of
undefined ->
"";
AuthSession ->
"AuthSession=" ++ AuthSession
end.
%%% end hack
%% erlfmt-ignore
set_auth_handlers() ->
AuthenticationDefault = "{chttpd_auth, cookie_authentication_handler},
{chttpd_auth, default_authentication_handler}",
AuthenticationSrcs = couch_httpd:make_fun_spec_strs(
config:get("chttpd", "authentication_handlers", AuthenticationDefault)),
AuthHandlers = lists:map(
fun(A) -> {auth_handler_name(A), couch_httpd:make_arity_1_fun(A)} end, AuthenticationSrcs),
AuthenticationFuns = AuthHandlers ++ [
fun chttpd_auth:party_mode_handler/1 %% must be last
],
ok = application:set_env(chttpd, auth_handlers, AuthenticationFuns).
% SpecStr is a string like "{my_module, my_fun}"
% Takes the first token of the function name in front '_' as auth handler name
% e.g.
% chttpd_auth:default_authentication_handler: default
% chttpd_auth_cookie_authentication_handler: cookie
% couch_http_auth:proxy_authentication_handler: proxy
%
% couch_http:auth_handler_name can't be used here, since it assumes the name
% of the auth handler to be the 6th token split by [\\W_]
% - this only works for modules with exactly two underscores in their name
% - is not very robust (a space after the ',' is assumed)
auth_handler_name(SpecStr) ->
{ok, {_, Fun}} = couch_util:parse_term(SpecStr),
hd(binary:split(atom_to_binary(Fun, latin1), <<"_">>)).
authenticate_request(Req) ->
{ok, AuthenticationFuns} = application:get_env(chttpd, auth_handlers),
authenticate_request(Req, chttpd_auth_cache, AuthenticationFuns).
authenticate_request(#httpd{} = Req0, AuthModule, AuthFuns) ->
Req = Req0#httpd{
auth_module = AuthModule,
authentication_handlers = AuthFuns
},
authenticate_request(Req, AuthFuns).
% Try authentication handlers in order until one returns a result
authenticate_request(#httpd{user_ctx = #user_ctx{}} = Req, _AuthFuns) ->
Req;
authenticate_request(#httpd{} = Req, [{Name, AuthFun} | Rest]) ->
authenticate_request(maybe_set_handler(AuthFun(Req), Name), Rest);
authenticate_request(#httpd{} = Req, [AuthFun | Rest]) ->
authenticate_request(AuthFun(Req), Rest);
authenticate_request(Response, _AuthFuns) ->
Response.
maybe_set_handler(#httpd{user_ctx = #user_ctx{} = UserCtx} = Req, Name) ->
Req#httpd{user_ctx = UserCtx#user_ctx{handler = Name}};
maybe_set_handler(Else, _) ->
Else.
increment_method_stats(Method) ->
couch_stats:increment_counter([couchdb, httpd_request_methods, Method]).
% Utilities
partition(Path) ->
mochiweb_util:partition(Path, "/").
header_value(#httpd{mochi_req = MochiReq}, Key) ->
MochiReq:get_header_value(Key).
header_value(#httpd{mochi_req = MochiReq}, Key, Default) ->
case MochiReq:get_header_value(Key) of
undefined -> Default;
Value -> Value
end.
primary_header_value(#httpd{mochi_req = MochiReq}, Key) ->
MochiReq:get_primary_header_value(Key).
serve_file(Req, RelativePath, DocumentRoot) ->
serve_file(Req, RelativePath, DocumentRoot, []).
serve_file(Req0, RelativePath0, DocumentRoot0, ExtraHeaders) ->
couch_httpd:serve_file(Req0, RelativePath0, DocumentRoot0, ExtraHeaders).
qs_value(Req, Key) ->
qs_value(Req, Key, undefined).
qs_value(Req, Key, Default) ->
couch_util:get_value(Key, qs(Req), Default).
qs_json_value(Req, Key, Default) ->
case qs_value(Req, Key, Default) of
Default ->
Default;
Result ->
?JSON_DECODE(Result)
end.
qs(#httpd{mochi_req = MochiReq, qs = undefined}) ->
MochiReq:parse_qs();
qs(#httpd{qs = QS}) ->
QS.
path(#httpd{mochi_req = MochiReq}) ->
MochiReq:get(path).
absolute_uri(#httpd{mochi_req = MochiReq, absolute_uri = undefined}, Path) ->
XHost = chttpd_util:get_chttpd_config(
"x_forwarded_host", "X-Forwarded-Host"
),
Host =
case MochiReq:get_header_value(XHost) of
undefined ->
case MochiReq:get_header_value("Host") of
undefined ->
{ok, {Address, Port}} =
case MochiReq:get(socket) of
{ssl, SslSocket} -> ssl:sockname(SslSocket);
Socket -> inet:sockname(Socket)
end,
inet_parse:ntoa(Address) ++ ":" ++ integer_to_list(Port);
Value1 ->
Value1
end;
Value ->
Value
end,
XSsl = chttpd_util:get_chttpd_config("x_forwarded_ssl", "X-Forwarded-Ssl"),
Scheme =
case MochiReq:get_header_value(XSsl) of
"on" ->
"https";
_ ->
XProto = chttpd_util:get_chttpd_config(
"x_forwarded_proto", "X-Forwarded-Proto"
),
case MochiReq:get_header_value(XProto) of
% Restrict to "https" and "http" schemes only
"https" ->
"https";
_ ->
case MochiReq:get(scheme) of
https ->
"https";
http ->
"http"
end
end
end,
Scheme ++ "://" ++ Host ++ Path;
absolute_uri(#httpd{absolute_uri = URI}, Path) ->
URI ++ Path.
unquote(UrlEncodedString) ->
case config:get_boolean("chttpd", "decode_plus_to_space", true) of
true -> mochiweb_util:unquote(UrlEncodedString);
false -> mochiweb_util:unquote_path(UrlEncodedString)
end.
quote(UrlDecodedString) ->
mochiweb_util:quote_plus(UrlDecodedString).
parse_form(#httpd{mochi_req = MochiReq}) ->
mochiweb_multipart:parse_form(MochiReq).
recv(#httpd{mochi_req = MochiReq}, Len) ->
MochiReq:recv(Len).
recv_chunked(#httpd{mochi_req = MochiReq}, MaxChunkSize, ChunkFun, InitState) ->
% Fun is called once with each chunk
% Fun({Length, Binary}, State)
% called with Length == 0 on the last time.
MochiReq:stream_body(MaxChunkSize, ChunkFun, InitState).
body_length(#httpd{mochi_req = MochiReq}) ->
MochiReq:get(body_length).
body(#httpd{mochi_req = MochiReq, req_body = ReqBody}) ->
case ReqBody of
undefined ->
% Maximum size of document PUT request body (4GB)
MaxSize = chttpd_util:get_chttpd_config_integer(
"max_http_request_size", 4294967296
),
Begin = os:timestamp(),
try
MochiReq:recv_body(MaxSize)
after
T = timer:now_diff(os:timestamp(), Begin) div 1000,
put(body_time, T)
end;
_Else ->
ReqBody
end.
validate_ctype(Req, Ctype) ->
couch_httpd:validate_ctype(Req, Ctype).
json_body(#httpd{} = Httpd) ->
json_body(Httpd, []).
json_body(#httpd{req_body = undefined} = Httpd, JsonDecodeOptions) ->
case body(Httpd) of
undefined ->
throw({bad_request, "Missing request body"});
Body ->
?JSON_DECODE(maybe_decompress(Httpd, Body), JsonDecodeOptions)
end;
json_body(#httpd{req_body = ReqBody}, _JsonDecodeOptions) ->
ReqBody.
json_body_obj(Httpd) ->
case json_body(Httpd) of
{Props} -> {Props};
_Else -> throw({bad_request, "Request body must be a JSON object"})
end.
doc_etag(#doc{id = Id, body = Body, revs = {Start, [DiskRev | _]}}) ->
couch_httpd:doc_etag(Id, Body, {Start, DiskRev}).
make_etag(Term) ->
couch_httpd:make_etag(Term).
etag_match(Req, CurrentEtag) when is_binary(CurrentEtag) ->
etag_match(Req, binary_to_list(CurrentEtag));
etag_match(Req, CurrentEtag) ->
EtagsToMatch0 = string:tokens(
chttpd:header_value(Req, "If-None-Match", ""), ", "
),
EtagsToMatch = lists:map(fun strip_weak_prefix/1, EtagsToMatch0),
lists:member(CurrentEtag, EtagsToMatch).
strip_weak_prefix([$W, $/ | Etag]) ->
Etag;
strip_weak_prefix(Etag) ->
Etag.
etag_respond(Req, CurrentEtag, RespFun) ->
case etag_match(Req, CurrentEtag) of
true ->
% the client has this in their cache.
Headers = [{"ETag", CurrentEtag}],
chttpd:send_response(Req, 304, Headers, <<>>);
false ->
% Run the function.
RespFun()
end.
verify_is_server_admin(#httpd{user_ctx = #user_ctx{roles = Roles}}) ->
case lists:member(<<"_admin">>, Roles) of
true -> ok;
false -> throw({unauthorized, <<"You are not a server admin.">>})
end.
start_response_length(#httpd{mochi_req = MochiReq} = Req, Code, Headers0, Length) ->
Headers1 = basic_headers(Req, Headers0),
Resp = handle_response(Req, Code, Headers1, Length, start_response_length),
case MochiReq:get(method) of
'HEAD' -> throw({http_head_abort, Resp});
_ -> ok
end,
{ok, Resp}.
send(Resp, Data) ->
Resp:send(Data),
{ok, Resp}.
start_chunked_response(#httpd{mochi_req = MochiReq} = Req, Code, Headers0) ->
Headers1 = basic_headers(Req, Headers0),
Resp = handle_response(Req, Code, Headers1, chunked, respond),
case MochiReq:get(method) of
'HEAD' -> throw({http_head_abort, Resp});
_ -> ok
end,
{ok, Resp}.
send_chunk({remote, _Pid, _Ref} = Resp, Data) ->
couch_httpd:send_chunk(Resp, Data);
send_chunk(Resp, Data) ->
Resp:write_chunk(Data),
{ok, Resp}.
send_response(Req, Code, Headers0, Body) ->
Headers1 = [timing(), reqid() | Headers0],
couch_httpd:send_response(Req, Code, Headers1, Body).
send_response_no_cors(Req, Code, Headers0, Body) ->
Headers1 = [timing(), reqid() | Headers0],
couch_httpd:send_response_no_cors(Req, Code, Headers1, Body).
send_method_not_allowed(Req, Methods) ->
send_error(
Req,
405,
[{"Allow", Methods}],
<<"method_not_allowed">>,
?l2b("Only " ++ Methods ++ " allowed"),
[]
).
send_json(Req, Value) ->
send_json(Req, 200, Value).
send_json(Req, Code, Value) ->
send_json(Req, Code, [], Value).
send_json(Req, Code, Headers0, Value) ->
Headers1 = [timing(), reqid() | Headers0],
couch_httpd:send_json(Req, Code, Headers1, Value).
start_json_response(Req, Code) ->
start_json_response(Req, Code, []).
start_json_response(Req, Code, Headers0) ->
Headers1 = [timing(), reqid() | Headers0],
couch_httpd:start_json_response(Req, Code, Headers1).
end_json_response(Resp) ->
couch_httpd:end_json_response(Resp).
start_delayed_json_response(Req, Code) ->
start_delayed_json_response(Req, Code, []).
start_delayed_json_response(Req, Code, Headers) ->
start_delayed_json_response(Req, Code, Headers, "").
start_delayed_json_response(Req, Code, Headers, FirstChunk) ->
{ok, #delayed_resp{
start_fun = fun start_json_response/3,
req = Req,
code = Code,
headers = Headers,
chunks = [FirstChunk],
buffer_response = buffer_response(Req)
}}.
start_delayed_chunked_response(Req, Code, Headers) ->
start_delayed_chunked_response(Req, Code, Headers, "").
start_delayed_chunked_response(Req, Code, Headers, FirstChunk) ->
{ok, #delayed_resp{
start_fun = fun start_chunked_response/3,
req = Req,
code = Code,
headers = Headers,
chunks = [FirstChunk],
buffer_response = buffer_response(Req)
}}.
send_delayed_chunk(#delayed_resp{buffer_response = false} = DelayedResp, Chunk) ->
{ok, #delayed_resp{resp = Resp} = DelayedResp1} =
start_delayed_response(DelayedResp),
{ok, Resp} = send_chunk(Resp, Chunk),
{ok, DelayedResp1};
send_delayed_chunk(#delayed_resp{buffer_response = true} = DelayedResp, Chunk) ->
#delayed_resp{chunks = Chunks} = DelayedResp,
{ok, DelayedResp#delayed_resp{chunks = [Chunk | Chunks]}}.
send_delayed_last_chunk(Req) ->
send_delayed_chunk(Req, []).
send_delayed_error(#delayed_resp{req = Req, resp = nil} = DelayedResp, Reason) ->
{Code, ErrorStr, ReasonStr} = error_info(Reason),
{ok, Resp} = send_error(Req, Code, ErrorStr, ReasonStr),
{ok, DelayedResp#delayed_resp{resp = Resp}};
send_delayed_error(#delayed_resp{resp = Resp, req = Req}, Reason) ->
update_timeout_stats(Reason, Req),
log_error_with_stack_trace(Reason),
throw({http_abort, Resp, Reason}).
close_delayed_json_object(Resp, Buffer, Terminator, 0) ->
% Use a separate chunk to close the streamed array to maintain strict
% compatibility with earlier versions. See COUCHDB-2724
{ok, R1} = chttpd:send_delayed_chunk(Resp, Buffer),
send_delayed_chunk(R1, Terminator);
close_delayed_json_object(Resp, Buffer, Terminator, _Threshold) ->
send_delayed_chunk(Resp, [Buffer | Terminator]).
end_delayed_json_response(#delayed_resp{buffer_response = false} = DelayedResp) ->
{ok, #delayed_resp{resp = Resp}} =
start_delayed_response(DelayedResp),
end_json_response(Resp);
end_delayed_json_response(#delayed_resp{buffer_response = true} = DelayedResp) ->
#delayed_resp{
start_fun = StartFun,
req = Req,
code = Code,
headers = Headers,
chunks = Chunks
} = DelayedResp,
{ok, Resp} = StartFun(Req, Code, Headers),
lists:foreach(
fun
([]) -> ok;
(Chunk) -> send_chunk(Resp, Chunk)
end,
lists:reverse(Chunks)
),
end_json_response(Resp).
get_delayed_req(#delayed_resp{req = #httpd{mochi_req = MochiReq}}) ->