From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/inets/src/http_server/httpd_cgi.erl | 124 ++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 lib/inets/src/http_server/httpd_cgi.erl

(limited to 'lib/inets/src/http_server/httpd_cgi.erl')

diff --git a/lib/inets/src/http_server/httpd_cgi.erl b/lib/inets/src/http_server/httpd_cgi.erl
new file mode 100644
index 0000000000..0532d7d100
--- /dev/null
+++ b/lib/inets/src/http_server/httpd_cgi.erl
@@ -0,0 +1,124 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2005-2009. 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(httpd_cgi).
+
+-export([parse_headers/1, handle_headers/1]).
+
+-include("inets_internal.hrl").
+
+%%%=========================================================================
+%%%  Internal application API 
+%%%=========================================================================
+
+%%--------------------------------------------------------------------------
+%% parse_headers([Bin, Data, Header, Headers]) -> {RevHeaders, Body} | 
+%%                                                {Module, Function, Args}
+%% Bin = Data = binary()
+%% Header = string() - Accumulator should be [] in first call
+%% Headers = [Header] - Accumulator should be [] in first call
+%% Body = string()
+%% RevHeaders = string() - Note CGI-headers not HTTP-headers 
+%%
+%% Description: Parses "<<Bin/binary, Data/binary>>" returned from the
+%% CGI-script until it findes the end of the CGI-headers (at least one
+%% CGI-HeaderField must be supplied) then it returns the CGI-headers
+%% and maybe some body data. If {Module, Function, Args} is
+%% returned it means that more data needs to be collected from the
+%% cgi-script as the end of the headers was not yet found. When more
+%% data has been collected call Module:Function([NewData | Args]).
+%%
+%% NOTE: The headers are backwards and should
+%% be so, devide_and_reverse_headers will reverse them back after
+%% taking advantage of the fact that they where backwards.  
+%%--------------------------------------------------------------------------
+parse_headers([Data, Bin,  Header, Headers]) ->
+    parse_headers(<<Bin/binary, Data/binary>>, Header, Headers).
+
+%%--------------------------------------------------------------------------
+%% handle_headers(CGIHeaders) -> {ok, HTTPHeaders, StatusCode} |
+%%                            {proceed, AbsPath}  
+%%	CGIHeaders = [string()]   
+%%	HTTPHeaders = [{HeaderField, HeaderValue}]
+%%      HeaderField = string()
+%%      HeaderValue = string()
+%%      StatusCode = integer()
+%% 
+%% Description: Interprets CGI headers and creates HTTP headers and a  
+%% appropriate HTTP status code. Note if a CGI location header is present
+%% the return value will be {proceed, AbsPath}
+%%--------------------------------------------------------------------------
+handle_headers(CGIHeaders) ->
+    handle_headers(CGIHeaders, [], {200, "ok"}).
+
+%%%========================================================================
+%%% Internal functions
+%%%========================================================================
+parse_headers(<<>>, Header, Headers) ->
+    {?MODULE, parse_headers, [<<>>, Header, Headers]};
+parse_headers(<<?CR,?LF>>, Header, Headers) ->
+    {?MODULE, parse_headers, [<<?CR,?LF>>, Header, Headers]};
+parse_headers(<<?LF>>, Header, Headers) ->
+    {?MODULE, parse_headers, [<<?LF>>, Header, Headers]};
+parse_headers(<<?CR, ?LF, ?CR, ?LF, Rest/binary>>, Header, Headers) ->
+    {ok, {[lists:reverse([?LF, ?CR | Header]) | Headers], Rest}};
+parse_headers(<<?LF, ?LF, Rest/binary>>, Header, Headers) ->
+    {ok, {[lists:reverse([?LF | Header]) | Headers], Rest}};
+parse_headers(<<?CR, ?LF, Rest/binary>>, Header, Headers) ->
+    parse_headers(Rest, [], [lists:reverse([?LF, ?CR | Header]) | Headers]);
+parse_headers(<<?LF, Rest/binary>>, Header, Headers) ->
+    parse_headers(Rest, [], [lists:reverse([?LF | Header]) | Headers]);
+parse_headers(<<Octet, Rest/binary>>, Header, Headers) ->
+    parse_headers(Rest, [Octet | Header], Headers).
+
+handle_headers([], HTTPHeaders, Status) ->
+    {ok, HTTPHeaders, Status};
+
+handle_headers([CGIHeader | CGIHeaders], HTTPHeaders, Status) ->
+    
+    {FieldName, FieldValue} = httpd_response:split_header(CGIHeader, []),
+   
+    case FieldName of
+	"content-type" ->
+	    handle_headers(CGIHeaders,
+			   [{FieldName, FieldValue} | HTTPHeaders], 
+			   Status);
+	"location" ->
+	    case http_request:is_absolut_uri(FieldValue) of
+		true ->
+		    handle_headers(CGIHeaders, 
+				       [{FieldName, FieldValue} | 
+					HTTPHeaders], {302, "Redirect"});
+		false ->
+		    {proceed, FieldValue}
+	    end;
+	"status" ->
+	    CodePhrase = 
+		case httpd_util:split(FieldValue," ",2) of
+		    {ok,[Code, Phrase]} ->
+			{list_to_integer(Code), Phrase};
+		    _ ->
+			{200, "OK"}
+		end,
+	    handle_headers(CGIHeaders, HTTPHeaders, CodePhrase);
+	_ -> %% Extension headers
+	    handle_headers(CGIHeaders,
+			   [{FieldName, FieldValue} | HTTPHeaders], Status)
+    end.	
+
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