  Hacked by Romuald du Song
%%
  Copyright ( C ) 2003   <  > .
%% All rights reserved.
%%
%% Redistribution and use in source and binary forms, with or without
%% modification, are permitted provided that the following conditions
%% are met: 
%%
  1 . Redistributions of source code must retain the above copyright
%%    notice, this list of conditions and the following disclaimer. 
  2 . Redistributions in binary form must reproduce the above
%%    copyright notice, this list of conditions and the following
%%    disclaimer in the documentation and/or other materials provided
%%    with the distribution.
%%
  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ` ` AS IS '' AND ANY EXPRESS
%% OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
%% WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
%% ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  DIRECT , INDIRECT , INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL
%% DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
%% GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION ) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY ,
%% WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
%% NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
%% SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-module(xmlrpc).
-author('').
-export([call/3, call/4, call/5, call/6, call/7, call/8, call2/7]).
-export([start_link/1, start_link/5, start_link/6, stop/1]).

%% Only for tests
-export([parse_response/3, open_socket/3]).

-include("log.hrl").

-include("xmlrpc.hrl").

%% Type definitions

-type socket() :: term().

-type ip_address() :: inet:ip_address().

-type host() :: string() | ip_address().

-type iso8601date() :: {date, string()}.

-type base64() :: {base64, string()}.

-type uri() :: string().

-type xmlrpc_value() :: integer() | float() | string() | boolean()
    | iso8601date() | base64() | xmlrpc_struct() | xmlrpc_array().

-type xmlrpc_struct() :: {struct, [{Key::atom(), Value::xmlrpc_value()}]}.

-type xmlrpc_array() :: {array, [xmlrpc_value()]}.

-type response_payload() :: {response, [xmlrpc_value()]}
    | {response, [xmlrpc_value()], #header{}}
    | {response, {fault, Code::integer(),
                  Message::string()}}.

-type call_result() :: {ok, response_payload()}
    | {ok, response_payload(), #header{}}
    | {ok, socket(), response_payload()}
    | {ok, socket(), response_payload(), #header{}}
    | {error, Reason::term()}
    | {error, socket(), Reason::term()}.

-type options() :: [{string(), term()}].

%% Exported: call/{3,4,5,6,7,8}

-spec call(Socket, URI, Payload) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]}.

call(Socket, URI, Payload) ->
    call2(Socket, URI, Payload, false, 60000, "", [{ssl, false}, {header, false}]).

-spec call(Host, Port, URI, Payload, Options) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    Options :: options();
(Socket, URI, Payload, KeepAlive, Timeout) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer().

call(Host, Port, URI, Payload, Options) when is_number(Port) ->
    call(Host, Port, URI, Payload, false, 60000, "", Options);

call(Socket, URI, Payload, KeepAlive, Timeout) ->
    call2(Socket, URI, Payload, KeepAlive, Timeout, "", [{ssl, false}, {header, false}]).

-spec call(Host, Port, URI, Payload) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]};
(Socket, URI, Payload, Options) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    Options :: options().

call(Host, Port, URI, Payload) when is_number(Port) ->
    call(Host, Port, URI, Payload, false, 60000, "", [{ssl, false}, {header, false}]);

call(Socket, URI, Payload, Options) ->
    call2(Socket, URI, Payload, false, 60000, "", Options).

-spec call(Host, Port, URI, Payload, KeepAlive, Timeout) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer();
(Socket, URI, Payload, KeepAlive, Timeout, Options) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer(),
    Options :: options().

call(Host, Port, URI, Payload, KeepAlive, Timeout) when is_number(Port) ->
    call(Host, Port, URI, Payload, KeepAlive, Timeout, "", [{ssl, false}, {header, false}]);

call(Socket, URI, Payload, KeepAlive, Timeout, Options) ->
    call2(Socket, URI, Payload, KeepAlive, Timeout, "", Options).

-spec call(Host, Port, URI, Payload, KeepAlive, Timeout, Options) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer(),
    Options :: options().

call(Host, Port, URI, Payload, KeepAlive, Timeout, Options) when is_number(Port) ->
    call(Host, Port, URI, Payload, KeepAlive, Timeout, "", Options);

call(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeader, Options) ->
  call2(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeader, Options).

-spec call(Host, Port, URI, Payload, KeepAlive, Timeout, ExtraHeaders, Options) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer(),
    ExtraHeaders :: string(),
    Options :: options().

call(Host, Port, URI, Payload, KeepAlive, Timeout, ExtraHeaders, Options) when is_number(Port)  ->
    case open_socket(Host, Port, Options) of
        {ok, Socket} -> call2(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeaders, Options);
        {error, Reason} when KeepAlive == false -> {error, Reason};
        {error, Reason} -> {error, undefined, Reason}
    end.


open_socket(Host, Port, Options) ->
    case fetch_comm_module(Options) of
        ssl ->
            %% Start ssl application
            application:start(ssl),
            %% Always seed
            ssl:seed("wheredoyouthinkitcanbefound"),
            %% new ssl implementation does not seem to work as of R13B01
{ ok , SslSocket } = ssl : connect(Host , Port , [ { ssl_imp , new } , { active , false } , { verify , verify_none } ] ) ,
            ssl:connect(Host, Port, [{verify, 0}, {active, false}]);
        _ ->
            gen_tcp:connect(Host, Port, [{active, false}])
    end.


call2(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeader, Options) ->
    ?DEBUG_LOG({payload_call, Payload}),
    case xmlrpc_encode:payload(Payload) of
        {ok, EncodedPayload} ->
            ?DEBUG_LOG({encoded_call, EncodedPayload}),
            case send(Socket, URI, KeepAlive, EncodedPayload, ExtraHeader, Options) of
                ok ->
                    case parse_response(Socket, Timeout, Options) of
                        {ok, Header} ->
                            handle_payload(Socket, KeepAlive, Timeout, Options, Header);
                        {error, Reason} when KeepAlive == false ->
                            comm_close(Options, Socket),
                            {error, Reason};
                        {error, Reason} -> {error, Socket, Reason}
                    end;
                {error, Reason} when KeepAlive == false ->
                    comm_close(Options, Socket),
                    {error, Reason};
                {error, Reason} -> {error, Socket, Reason}
            end;
        {error, Reason} when KeepAlive == false ->
            comm_close(Options, Socket),
            {error, Reason};
        {error, Reason} -> {error, Socket, Reason}
    end.

send(Socket, URI, false, Payload, ExtraHeader, SslOption) ->
    send(Socket, URI, lists:flatten(["Connection: close\r\n" | ExtraHeader]), Payload, SslOption);
send(Socket, URI, true, Payload, ExtraHeader, SslOption) ->
    send(Socket, URI, ExtraHeader, Payload, SslOption).

send(Socket, URI, Header, Payload, SslOption) ->
    Request =
              ["POST ", URI, " HTTP/1.1\r\n",
               "Content-Length: ", integer_to_list(lists:flatlength(Payload)), "\r\n",
               "User-Agent: Erlang XML-RPC Client 1.13\r\n",
               "Content-Type: text/xml\r\n",
               Header, "\r\n",
               Payload],
    M = fetch_comm_module(SslOption),
    apply(M, send, [Socket, Request]).

parse_response(Socket, Timeout, SslOption) ->
    M = fetch_comm_module(SslOption),
    S = fetch_sets_module(SslOption),
    apply(S, setopts, [Socket, [{packet, line}]]),
    case apply(M, recv, [Socket, 0, Timeout]) of
        {ok, "HTTP/1.1 200 OK\r\n"} -> parse_header(Socket, Timeout, SslOption);
        {ok, StatusLine} -> {error, StatusLine};
        {error, Reason} -> {error, Reason}
    end.

fetch_comm_module(Options) ->
    case lists:keysearch(ssl, 1, Options) of
        {value, {ssl, true}} -> ssl;
        _ -> gen_tcp
    end.

has_header_option(Options) ->
    case lists:keysearch(header, 1, Options) of
        {value, {_, true}} -> true;
        _ -> false
    end.

fetch_sets_module(Options) ->
    case lists:keysearch(ssl, 1, Options) of
        {value, {ssl, true}} -> ssl;
        _ -> inet
    end.

comm_close(Options, Socket) ->
    M = fetch_comm_module(Options),
    apply(M, close, [ Socket ]).

parse_header(Socket, Timeout, SslOption) -> parse_header(Socket, Timeout, SslOption, #header{}).

parse_header(Socket, Timeout, SslOption, Header) ->
    M = fetch_comm_module(SslOption),
    case apply(M, recv, [Socket, 0, Timeout]) of
        {ok, "\r\n"} when Header#header.content_length == undefined ->
            {error, missing_content_length};
        {ok, "\r\n"} -> {ok, Header};
        {ok, HeaderField} ->
            case string:tokens(string:to_lower(HeaderField), " \r\n") of
                ["content-length:", ContentLength] ->
                    case catch list_to_integer(ContentLength) of
                        badarg ->
                            {error, {invalid_content_length, ContentLength}};
                        Value ->
                            parse_header(Socket, Timeout, SslOption,
                                         Header#header{content_length =
                                                       Value})
                    end;
                ["connection:", "close"] ->
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{connection = close});
                ["x-forwarded-for:", XForwardedFor] ->
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{xforwardedfor = XForwardedFor});
                ["authorization:", Authorization] ->
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{authorization = Authorization});
                ["cookie:", Cookie] ->
                    Cookies = [ Cookie | Header#header.cookies ],
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{cookies = Cookies});
                _ ->
                    parse_header(Socket, Timeout, SslOption, Header)
            end;
        {error, Reason} -> {error, Reason}
    end.

handle_payload(Socket, KeepAlive, Timeout, Options, Header) ->
    case get_payload(Socket, Timeout, Options, Header#header.content_length) of
        {ok, Payload} ->
            ?DEBUG_LOG({encoded_response, Payload}),
            case xmlrpc_decode:payload(Payload) of
                {ok, {response, DecodedPayload}} when KeepAlive == false ->
                    ?DEBUG_LOG({decoded_response, DecodedPayload}),
                    comm_close(Options, Socket),
                    case has_header_option(Options) of
                        true ->
                            {ok, {response, DecodedPayload, Header}};
                        _ ->
                            {ok, {response, DecodedPayload}}
                    end;
                {ok, {response, DecodedPayload}} when KeepAlive == true,
                        Header#header.connection == close ->
                    ?DEBUG_LOG({decoded_response, DecodedPayload}),
                    comm_close(Options, Socket),
                    case has_header_option(Options) of
                        true ->
                            {ok, Socket, {response, DecodedPayload, Header}};
                        _ ->
                            {ok, Socket, {response, DecodedPayload}}
                    end;
                {ok, {response, DecodedPayload}} ->
                    ?DEBUG_LOG({decoded_response, DecodedPayload}),
                    case has_header_option(Options) of
                        true ->
                            {ok, Socket, {response, DecodedPayload, Header}};
                        _ ->
                            {ok, Socket, {response, DecodedPayload}}
                    end;
                {error, Reason} when KeepAlive == false ->
                    comm_close(Options, Socket),
                    {error, Reason};
                {error, Reason} when KeepAlive == true,
                        Header#header.connection == close ->
                    comm_close(Options, Socket),
                    {error, Socket, Reason};
                {error, Reason} ->
                    {error, Socket, Reason}
            end;
        {error, Reason} when KeepAlive == false ->
            gen_tcp:close(Socket),
            {error, Reason};
        {error, Reason} when KeepAlive == true,
                Header#header.connection == close ->
            comm_close(Options, Socket),
            {error, Socket, Reason};
        {error, Reason} -> {error, Socket, Reason}
    end.

get_payload(Socket, Timeout, SslOption, ContentLength) ->
    M = fetch_comm_module(SslOption),
    apply(fetch_sets_module(SslOption), setopts, [Socket, [{packet, raw}]]),
    apply(M, recv, [Socket, ContentLength, Timeout]).

%% Exported: start_link/{1,5,6}

start_link(Handler) -> start_link(4567, 1000, 60000, Handler, undefined).

start_link(Port, MaxSessions, Timeout, Handler, State) ->
    start_link(all, Port, MaxSessions, Timeout, Handler, State).

start_link(IP, Port, MaxSessions, Timeout, Handler, State) ->
    OptionList = [{active, false}, {reuseaddr, true}] ++ ip(IP),
    SessionHandler = {xmlrpc_http, handler, [Timeout, Handler, State]},
    tcp_serv:start_link([Port, MaxSessions, OptionList, SessionHandler]).

ip(all) -> [];
ip(IP) when is_tuple(IP) -> [{ip, IP}].

%% Exported: stop/1

stop(Pid) -> tcp_serv:stop(Pid).


 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met: 

    notice, this list of conditions and the following disclaimer. 
    copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided
    with the distribution.

 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 Only for tests
 Type definitions
 Exported: call/{3,4,5,6,7,8}
 Start ssl application
 Always seed
 new ssl implementation does not seem to work as of R13B01
 Exported: start_link/{1,5,6}
 Exported: stop/1
  Hacked by Romuald du Song
  Copyright ( C ) 2003   <  > .
  1 . Redistributions of source code must retain the above copyright
  2 . Redistributions in binary form must reproduce the above
  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ` ` AS IS '' AND ANY EXPRESS
  DIRECT , INDIRECT , INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL
  INTERRUPTION ) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY ,

-module(xmlrpc).
-author('').
-export([call/3, call/4, call/5, call/6, call/7, call/8, call2/7]).
-export([start_link/1, start_link/5, start_link/6, stop/1]).

-export([parse_response/3, open_socket/3]).

-include("log.hrl").

-include("xmlrpc.hrl").


-type socket() :: term().

-type ip_address() :: inet:ip_address().

-type host() :: string() | ip_address().

-type iso8601date() :: {date, string()}.

-type base64() :: {base64, string()}.

-type uri() :: string().

-type xmlrpc_value() :: integer() | float() | string() | boolean()
    | iso8601date() | base64() | xmlrpc_struct() | xmlrpc_array().

-type xmlrpc_struct() :: {struct, [{Key::atom(), Value::xmlrpc_value()}]}.

-type xmlrpc_array() :: {array, [xmlrpc_value()]}.

-type response_payload() :: {response, [xmlrpc_value()]}
    | {response, [xmlrpc_value()], #header{}}
    | {response, {fault, Code::integer(),
                  Message::string()}}.

-type call_result() :: {ok, response_payload()}
    | {ok, response_payload(), #header{}}
    | {ok, socket(), response_payload()}
    | {ok, socket(), response_payload(), #header{}}
    | {error, Reason::term()}
    | {error, socket(), Reason::term()}.

-type options() :: [{string(), term()}].


-spec call(Socket, URI, Payload) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]}.

call(Socket, URI, Payload) ->
    call2(Socket, URI, Payload, false, 60000, "", [{ssl, false}, {header, false}]).

-spec call(Host, Port, URI, Payload, Options) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    Options :: options();
(Socket, URI, Payload, KeepAlive, Timeout) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer().

call(Host, Port, URI, Payload, Options) when is_number(Port) ->
    call(Host, Port, URI, Payload, false, 60000, "", Options);

call(Socket, URI, Payload, KeepAlive, Timeout) ->
    call2(Socket, URI, Payload, KeepAlive, Timeout, "", [{ssl, false}, {header, false}]).

-spec call(Host, Port, URI, Payload) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]};
(Socket, URI, Payload, Options) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    Options :: options().

call(Host, Port, URI, Payload) when is_number(Port) ->
    call(Host, Port, URI, Payload, false, 60000, "", [{ssl, false}, {header, false}]);

call(Socket, URI, Payload, Options) ->
    call2(Socket, URI, Payload, false, 60000, "", Options).

-spec call(Host, Port, URI, Payload, KeepAlive, Timeout) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer();
(Socket, URI, Payload, KeepAlive, Timeout, Options) -> call_result()
 when Socket :: socket(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer(),
    Options :: options().

call(Host, Port, URI, Payload, KeepAlive, Timeout) when is_number(Port) ->
    call(Host, Port, URI, Payload, KeepAlive, Timeout, "", [{ssl, false}, {header, false}]);

call(Socket, URI, Payload, KeepAlive, Timeout, Options) ->
    call2(Socket, URI, Payload, KeepAlive, Timeout, "", Options).

-spec call(Host, Port, URI, Payload, KeepAlive, Timeout, Options) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer(),
    Options :: options().

call(Host, Port, URI, Payload, KeepAlive, Timeout, Options) when is_number(Port) ->
    call(Host, Port, URI, Payload, KeepAlive, Timeout, "", Options);

call(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeader, Options) ->
  call2(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeader, Options).

-spec call(Host, Port, URI, Payload, KeepAlive, Timeout, ExtraHeaders, Options) -> call_result()
 when Host :: host(),
    Port :: integer(),
    URI :: uri(),
    Payload :: {call, Method::atom(), Arguments::[xmlrpc_value()]},
    KeepAlive :: boolean(),
    Timeout :: integer(),
    ExtraHeaders :: string(),
    Options :: options().

call(Host, Port, URI, Payload, KeepAlive, Timeout, ExtraHeaders, Options) when is_number(Port)  ->
    case open_socket(Host, Port, Options) of
        {ok, Socket} -> call2(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeaders, Options);
        {error, Reason} when KeepAlive == false -> {error, Reason};
        {error, Reason} -> {error, undefined, Reason}
    end.


open_socket(Host, Port, Options) ->
    case fetch_comm_module(Options) of
        ssl ->
            application:start(ssl),
            ssl:seed("wheredoyouthinkitcanbefound"),
{ ok , SslSocket } = ssl : connect(Host , Port , [ { ssl_imp , new } , { active , false } , { verify , verify_none } ] ) ,
            ssl:connect(Host, Port, [{verify, 0}, {active, false}]);
        _ ->
            gen_tcp:connect(Host, Port, [{active, false}])
    end.


call2(Socket, URI, Payload, KeepAlive, Timeout, ExtraHeader, Options) ->
    ?DEBUG_LOG({payload_call, Payload}),
    case xmlrpc_encode:payload(Payload) of
        {ok, EncodedPayload} ->
            ?DEBUG_LOG({encoded_call, EncodedPayload}),
            case send(Socket, URI, KeepAlive, EncodedPayload, ExtraHeader, Options) of
                ok ->
                    case parse_response(Socket, Timeout, Options) of
                        {ok, Header} ->
                            handle_payload(Socket, KeepAlive, Timeout, Options, Header);
                        {error, Reason} when KeepAlive == false ->
                            comm_close(Options, Socket),
                            {error, Reason};
                        {error, Reason} -> {error, Socket, Reason}
                    end;
                {error, Reason} when KeepAlive == false ->
                    comm_close(Options, Socket),
                    {error, Reason};
                {error, Reason} -> {error, Socket, Reason}
            end;
        {error, Reason} when KeepAlive == false ->
            comm_close(Options, Socket),
            {error, Reason};
        {error, Reason} -> {error, Socket, Reason}
    end.

send(Socket, URI, false, Payload, ExtraHeader, SslOption) ->
    send(Socket, URI, lists:flatten(["Connection: close\r\n" | ExtraHeader]), Payload, SslOption);
send(Socket, URI, true, Payload, ExtraHeader, SslOption) ->
    send(Socket, URI, ExtraHeader, Payload, SslOption).

send(Socket, URI, Header, Payload, SslOption) ->
    Request =
              ["POST ", URI, " HTTP/1.1\r\n",
               "Content-Length: ", integer_to_list(lists:flatlength(Payload)), "\r\n",
               "User-Agent: Erlang XML-RPC Client 1.13\r\n",
               "Content-Type: text/xml\r\n",
               Header, "\r\n",
               Payload],
    M = fetch_comm_module(SslOption),
    apply(M, send, [Socket, Request]).

parse_response(Socket, Timeout, SslOption) ->
    M = fetch_comm_module(SslOption),
    S = fetch_sets_module(SslOption),
    apply(S, setopts, [Socket, [{packet, line}]]),
    case apply(M, recv, [Socket, 0, Timeout]) of
        {ok, "HTTP/1.1 200 OK\r\n"} -> parse_header(Socket, Timeout, SslOption);
        {ok, StatusLine} -> {error, StatusLine};
        {error, Reason} -> {error, Reason}
    end.

fetch_comm_module(Options) ->
    case lists:keysearch(ssl, 1, Options) of
        {value, {ssl, true}} -> ssl;
        _ -> gen_tcp
    end.

has_header_option(Options) ->
    case lists:keysearch(header, 1, Options) of
        {value, {_, true}} -> true;
        _ -> false
    end.

fetch_sets_module(Options) ->
    case lists:keysearch(ssl, 1, Options) of
        {value, {ssl, true}} -> ssl;
        _ -> inet
    end.

comm_close(Options, Socket) ->
    M = fetch_comm_module(Options),
    apply(M, close, [ Socket ]).

parse_header(Socket, Timeout, SslOption) -> parse_header(Socket, Timeout, SslOption, #header{}).

parse_header(Socket, Timeout, SslOption, Header) ->
    M = fetch_comm_module(SslOption),
    case apply(M, recv, [Socket, 0, Timeout]) of
        {ok, "\r\n"} when Header#header.content_length == undefined ->
            {error, missing_content_length};
        {ok, "\r\n"} -> {ok, Header};
        {ok, HeaderField} ->
            case string:tokens(string:to_lower(HeaderField), " \r\n") of
                ["content-length:", ContentLength] ->
                    case catch list_to_integer(ContentLength) of
                        badarg ->
                            {error, {invalid_content_length, ContentLength}};
                        Value ->
                            parse_header(Socket, Timeout, SslOption,
                                         Header#header{content_length =
                                                       Value})
                    end;
                ["connection:", "close"] ->
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{connection = close});
                ["x-forwarded-for:", XForwardedFor] ->
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{xforwardedfor = XForwardedFor});
                ["authorization:", Authorization] ->
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{authorization = Authorization});
                ["cookie:", Cookie] ->
                    Cookies = [ Cookie | Header#header.cookies ],
                    parse_header(Socket, Timeout, SslOption,
                                 Header#header{cookies = Cookies});
                _ ->
                    parse_header(Socket, Timeout, SslOption, Header)
            end;
        {error, Reason} -> {error, Reason}
    end.

handle_payload(Socket, KeepAlive, Timeout, Options, Header) ->
    case get_payload(Socket, Timeout, Options, Header#header.content_length) of
        {ok, Payload} ->
            ?DEBUG_LOG({encoded_response, Payload}),
            case xmlrpc_decode:payload(Payload) of
                {ok, {response, DecodedPayload}} when KeepAlive == false ->
                    ?DEBUG_LOG({decoded_response, DecodedPayload}),
                    comm_close(Options, Socket),
                    case has_header_option(Options) of
                        true ->
                            {ok, {response, DecodedPayload, Header}};
                        _ ->
                            {ok, {response, DecodedPayload}}
                    end;
                {ok, {response, DecodedPayload}} when KeepAlive == true,
                        Header#header.connection == close ->
                    ?DEBUG_LOG({decoded_response, DecodedPayload}),
                    comm_close(Options, Socket),
                    case has_header_option(Options) of
                        true ->
                            {ok, Socket, {response, DecodedPayload, Header}};
                        _ ->
                            {ok, Socket, {response, DecodedPayload}}
                    end;
                {ok, {response, DecodedPayload}} ->
                    ?DEBUG_LOG({decoded_response, DecodedPayload}),
                    case has_header_option(Options) of
                        true ->
                            {ok, Socket, {response, DecodedPayload, Header}};
                        _ ->
                            {ok, Socket, {response, DecodedPayload}}
                    end;
                {error, Reason} when KeepAlive == false ->
                    comm_close(Options, Socket),
                    {error, Reason};
                {error, Reason} when KeepAlive == true,
                        Header#header.connection == close ->
                    comm_close(Options, Socket),
                    {error, Socket, Reason};
                {error, Reason} ->
                    {error, Socket, Reason}
            end;
        {error, Reason} when KeepAlive == false ->
            gen_tcp:close(Socket),
            {error, Reason};
        {error, Reason} when KeepAlive == true,
                Header#header.connection == close ->
            comm_close(Options, Socket),
            {error, Socket, Reason};
        {error, Reason} -> {error, Socket, Reason}
    end.

get_payload(Socket, Timeout, SslOption, ContentLength) ->
    M = fetch_comm_module(SslOption),
    apply(fetch_sets_module(SslOption), setopts, [Socket, [{packet, raw}]]),
    apply(M, recv, [Socket, ContentLength, Timeout]).


start_link(Handler) -> start_link(4567, 1000, 60000, Handler, undefined).

start_link(Port, MaxSessions, Timeout, Handler, State) ->
    start_link(all, Port, MaxSessions, Timeout, Handler, State).

start_link(IP, Port, MaxSessions, Timeout, Handler, State) ->
    OptionList = [{active, false}, {reuseaddr, true}] ++ ip(IP),
    SessionHandler = {xmlrpc_http, handler, [Timeout, Handler, State]},
    tcp_serv:start_link([Port, MaxSessions, OptionList, SessionHandler]).

ip(all) -> [];
ip(IP) when is_tuple(IP) -> [{ip, IP}].


stop(Pid) -> tcp_serv:stop(Pid).
