From 544a38dd45f6a58d34296c6c768afd086eb2ac70 Mon Sep 17 00:00:00 2001
From: Christopher Lenz <cmlenz@apache.org>
Date: Fri, 28 Mar 2008 23:32:19 +0000
Subject: Imported trunk.

git-svn-id: https://svn.apache.org/repos/asf/incubator/couchdb/trunk@642432 13f79535-47bb-0310-9956-ffa450edef68
---
 src/couch_inets/httpd_esi.erl | 106 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/couch_inets/httpd_esi.erl

(limited to 'src/couch_inets/httpd_esi.erl')

diff --git a/src/couch_inets/httpd_esi.erl b/src/couch_inets/httpd_esi.erl
new file mode 100644
index 00000000..2f7c9d38
--- /dev/null
+++ b/src/couch_inets/httpd_esi.erl
@@ -0,0 +1,106 @@
+%% ``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 via the world wide web 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.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%%
+-module(httpd_esi).
+
+-export([parse_headers/1, handle_headers/1]).
+
+-include("inets_internal.hrl").
+
+%%%=========================================================================
+%%%  Internal application API 
+%%%=========================================================================
+
+%%--------------------------------------------------------------------------
+%% parse_headers(Data) -> {Headers, Body}
+%%
+%% Data = string() | io_list()
+%% Headers = string()
+%% Body = io_list()
+%%
+%% Description: Parses <Data> and divides it to a header part and a
+%% body part. Note that it is presumed that <Data> starts with a
+%% string including "\r\n\r\n" if there is any header information
+%% present. The returned headers will not contain the HTTP header body
+%% delimiter \r\n. (All header, header delimiters are keept.)
+%% Ex: ["Content-Type : text/html\r\n Connection : closing \r\n\r\n" | 
+%% io_list()] -->  {"Content-Type : text/html\r\n Connection : closing \r\n",
+%% io_list()}
+%%--------------------------------------------------------------------------
+parse_headers(Data) ->
+    parse_headers(Data, []).
+
+%%--------------------------------------------------------------------------
+%% handle_headers(Headers) -> {ok, HTTPHeaders, StatusCode} |
+%%                            {proceed, AbsPath}  
+%%	Headers = string()   
+%%	HTTPHeaders = [{HeaderField, HeaderValue}]
+%%      HeaderField = string()
+%%      HeaderValue = string() 
+%%      StatusCode = integer()
+%% 
+%% Description: Transforms the plain HTTP header string data received
+%% from the ESI program into a list of header values and an
+%% appropriate HTTP status code. Note if a location header is present
+%% the return value will be {proceed, AbsPath}
+%%--------------------------------------------------------------------------
+handle_headers("") ->
+    {ok, [], 200};
+handle_headers(Headers) ->
+    NewHeaders = string:tokens(Headers, ?CRLF),
+    handle_headers(NewHeaders, [], 200).
+
+%%%========================================================================
+%%% Internal functions
+%%%========================================================================
+parse_headers([], Acc) ->
+    {[], lists:reverse(Acc)};
+parse_headers([?CR, ?LF, ?CR, ?LF], Acc) ->
+    {lists:reverse(Acc) ++ [?CR, ?LF], []};
+parse_headers([?CR, ?LF, ?CR, ?LF | Rest], Acc) ->
+    {lists:reverse(Acc) ++ [?CR, ?LF], Rest};
+parse_headers([Char | Rest], Acc) ->
+    parse_headers(Rest, [Char | Acc]).
+ 
+handle_headers([], NewHeaders, StatusCode) ->
+    {ok, NewHeaders, StatusCode};
+
+handle_headers([Header | Headers], NewHeaders, StatusCode) -> 
+    {FieldName, FieldValue} = httpd_response:split_header(Header, []),
+    case FieldName of
+	"location" ->
+	    case http_request:is_absolut_uri(FieldValue) of
+		true ->
+		    handle_headers(Headers, 
+				   [{FieldName, FieldValue} | NewHeaders], 
+				   302);
+		false ->
+		    {proceed, FieldValue}
+	    end;
+	"status" ->
+	    NewStatusCode = 
+		case httpd_util:split(FieldValue," ",2) of
+		    {ok,[Code,_]} ->
+			list_to_integer(Code);
+		    _ ->
+			200
+		end,
+	    handle_headers(Headers, NewHeaders, NewStatusCode);
+	_ -> 
+	    handle_headers(Headers, 
+			     [{FieldName, FieldValue}| NewHeaders], StatusCode)
+    end.	
-- 
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