aboutsummaryrefslogtreecommitdiffstats
path: root/lib/inets/src/http_client/httpc_request.erl
blob: 3d66638d66ac03f4bdc0432a85cc7e45aff88078 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2004-2009. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%

-module(httpc_request).

-include("http_internal.hrl").
-include("httpc_internal.hrl").

%%% Internal API
-export([send/3, is_idempotent/1, is_client_closing/1]).

%%%=========================================================================
%%%  Internal application API
%%%=========================================================================
%%-------------------------------------------------------------------------
%% send(MaybeProxy, Request) ->
%%      MaybeProxy - {Host, Port}
%%      Host = string()
%%      Port = integer()
%%	Request - #request{}
%%	Socket - socket()
%%      CookieSupport - enabled | disabled | verify
%%                                   
%% Description: Composes and sends a HTTP-request. 
%%-------------------------------------------------------------------------
send(SendAddr, #request{method = Method, scheme = Scheme,
			path = Path, pquery = Query, headers = Headers,
			content = Content, address = Address, 
			abs_uri = AbsUri, headers_as_is = HeadersAsIs,
			settings = HttpOptions, 
			userinfo = UserInfo},
     Socket) -> 
    
    TmpHeaders = handle_user_info(UserInfo, Headers),

    {TmpHeaders2, Body} = 
	post_data(Method, TmpHeaders, Content, HeadersAsIs),
    
    {NewHeaders, Uri} = case Address of
			    SendAddr ->
				{TmpHeaders2, Path ++ Query};
			    _Proxy ->
				TmpHeaders3 =
				    handle_proxy(HttpOptions, TmpHeaders2),
				{TmpHeaders3, AbsUri}
			end,

    FinalHeaders = case NewHeaders of
		       HeaderList when is_list(HeaderList) ->
			   http_headers(HeaderList, []);
		       _  ->
			   http_request:http_headers(NewHeaders)
		   end,
    Version = HttpOptions#http_options.version,

    Message = [method(Method), " ", Uri, " ", 
	       version(Version), ?CRLF, headers(FinalHeaders, Version), ?CRLF, Body],
    
    http_transport:send(socket_type(Scheme), Socket, lists:append(Message)).

%%-------------------------------------------------------------------------
%% is_idempotent(Method) ->
%% Method = atom()
%%                                   
%% Description: Checks if Method is considered idempotent.
%%-------------------------------------------------------------------------

%% In particular, the convention has been established that the GET and
%% HEAD methods SHOULD NOT have the significance of taking an action
%% other than retrieval. These methods ought to be considered "safe".
is_idempotent(head) -> 
    true;
is_idempotent(get) ->
    true;
%% Methods can also have the property of "idempotence" in that (aside
%% from error or expiration issues) the side-effects of N > 0
%% identical requests is the same as for a single request.
is_idempotent(put) -> 
    true;
is_idempotent(delete) ->
    true;
%% Also, the methods OPTIONS and TRACE SHOULD NOT have side effects,
%% and so are inherently idempotent.
is_idempotent(trace) ->
    true;
is_idempotent(options) ->
    true;
is_idempotent(_) ->
    false.

%%-------------------------------------------------------------------------
%% is_client_closing(Headers) ->
%% Headers = #http_request_h{}
%%                                   
%% Description: Checks if the client has supplied a "Connection:
%% close" header.
%%-------------------------------------------------------------------------
is_client_closing(Headers) ->
    case Headers#http_request_h.connection of
	"close" ->
	    true;
	 _ ->
	    false
    end.

%%%========================================================================
%%% Internal functions
%%%========================================================================
post_data(Method, Headers, {ContentType, Body}, HeadersAsIs) 
  when Method == post; Method == put ->
    ContentLength = body_length(Body),	      
    NewBody = case Headers#http_request_h.expect of
		  "100-continue" ->
		      "";
		  _ ->
		      Body
	      end,
    
    NewHeaders = case HeadersAsIs of
		     [] ->
			 Headers#http_request_h{'content-type' = 
						ContentType, 
						'content-length' = 
						ContentLength};
		     _ ->
			 HeadersAsIs
		 end,
    
    {NewHeaders, NewBody};

post_data(_, Headers, _, []) ->
    {Headers, ""};
post_data(_, _, _, HeadersAsIs = [_|_]) ->
    {HeadersAsIs, ""}.

body_length(Body) when is_binary(Body) ->
   integer_to_list(size(Body));

body_length(Body) when is_list(Body) ->
  integer_to_list(length(Body)).

method(Method) ->
    http_util:to_upper(atom_to_list(Method)).

version("HTTP/0.9") ->
    "";
version(Version) ->
    Version.

headers(_, "HTTP/0.9") ->
    "";
%% HTTP 1.1 headers not present in HTTP 1.0 should be
%% consider as unknown extension headers that should be
%% ignored. 
headers(Headers, _) ->
    Headers.

socket_type(http) ->
    ip_comm;
socket_type(https) ->
    {ssl, []}.

http_headers([], Headers) ->
    lists:flatten(Headers);
http_headers([{Key,Value} | Rest], Headers) ->
    Header = Key ++ ": " ++ Value ++ ?CRLF,
    http_headers(Rest, [Header | Headers]).

handle_proxy(_, Headers) when is_list(Headers) ->
    Headers; %% Headers as is option was specified
handle_proxy(HttpOptions, Headers) ->
    case HttpOptions#http_options.proxy_auth of
	undefined ->
	    Headers;
	{User, Password} ->
	    UserPasswd = base64:encode_to_string(User ++ ":" ++ Password),
	    Headers#http_request_h{'proxy-authorization' = 
				   "Basic " ++ UserPasswd}
    end.

handle_user_info([], Headers) ->
    Headers;
handle_user_info(UserInfo, Headers) ->
    case string:tokens(UserInfo, ":") of
	[User, Passwd] ->
	    UserPasswd = base64:encode_to_string(User ++ ":" ++ Passwd),
	    Headers#http_request_h{authorization = "Basic " ++ UserPasswd};
	[User] ->
	    UserPasswd = base64:encode_to_string(User ++ ":"),
	    Headers#http_request_h{authorization = "Basic " ++ UserPasswd}; 
	_ ->
	    Headers
    end.