From fec86f72cfdd76162667397ac7c82e950c1e5be7 Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Thu, 11 Apr 2013 20:01:03 +0100
Subject: net.http.parser: Fix chunked encoding response parsing, and make it
 more robust

---
 net/http/parser.lua | 35 ++++++++++++++++++++---------------
 1 file changed, 20 insertions(+), 15 deletions(-)

(limited to 'net')

diff --git a/net/http/parser.lua b/net/http/parser.lua
index 684d62fe..34742d2b 100644
--- a/net/http/parser.lua
+++ b/net/http/parser.lua
@@ -1,4 +1,3 @@
-
 local tonumber = tonumber;
 local assert = assert;
 local url_parse = require "socket.url".parse;
@@ -29,7 +28,7 @@ function httpstream.new(success_cb, error_cb, parser_type, options_cb)
 	local client = true;
 	if not parser_type or parser_type == "server" then client = false; else assert(parser_type == "client", "Invalid parser type"); end
 	local buf = "";
-	local chunked;
+	local chunked, chunk_size, chunk_start;
 	local state = nil;
 	local packet;
 	local len;
@@ -71,7 +70,6 @@ function httpstream.new(success_cb, error_cb, parser_type, options_cb)
 									 ( (options_cb and options_cb().method == "HEAD")
 									or (status_code == 204 or status_code == 304 or status_code == 301)
 									or (status_code >= 100 and status_code < 200) );
-								chunked = have_body and headers["transfer-encoding"] == "chunked";
 							else
 								method, path, httpversion = line:match("^(%w+) (%S+) HTTP/(1%.[01])$");
 								if not method then error = true; return error_cb("invalid-status-line"); end
@@ -79,6 +77,7 @@ function httpstream.new(success_cb, error_cb, parser_type, options_cb)
 						end
 					end
 					if not first_line then error = true; return error_cb("invalid-status-line"); end
+					chunked = have_body and headers["transfer-encoding"] == "chunked";
 					len = tonumber(headers["content-length"]); -- TODO check for invalid len
 					if client then
 						-- FIXME handle '100 Continue' response (by skipping it)
@@ -121,19 +120,25 @@ function httpstream.new(success_cb, error_cb, parser_type, options_cb)
 				if state then -- read body
 					if client then
 						if chunked then
-							local index = buf:find("\r\n", nil, true);
-							if not index then return; end -- not enough data
-							local chunk_size = buf:match("^%x+");
-							if not chunk_size then error = true; return error_cb("invalid-chunk-size"); end
-							chunk_size = tonumber(chunk_size, 16);
-							index = index + 2;
-							if chunk_size == 0 then
-								state = nil; success_cb(packet);
-							elseif #buf - index + 1 >= chunk_size then -- we have a chunk
-								packet.body = packet.body..buf:sub(index, index + chunk_size - 1);
-								buf = buf:sub(index + chunk_size);
+							if not buf:find("\r\n", nil, true) then
+								return;
+							end -- not enough data
+							if not chunk_size then
+								chunk_size, chunk_start = buf:match("^(%x+)[^\r\n]*\r\n()");
+								chunk_size = chunk_size and tonumber(chunk_size, 16);
+								if not chunk_size then error = true; return error_cb("invalid-chunk-size"); end
+							end
+							if chunk_size == 0 and buf:find("\r\n\r\n", chunk_start-2, true) then
+								state, chunk_size = nil, nil;
+								buf = buf:gsub("^.-\r\n\r\n", ""); -- This ensure extensions and trailers are stripped
+								success_cb(packet);
+							elseif #buf - chunk_start + 2 >= chunk_size then -- we have a chunk
+								packet.body = packet.body..buf:sub(chunk_start, chunk_start + chunk_size);
+								buf = buf:sub(chunk_start + chunk_size + 2);
+								chunk_size, chunk_start = nil, nil;
+							else -- Partial chunk remaining
+								break;
 							end
-							error("trailers"); -- FIXME MUST read trailers
 						elseif len and #buf >= len then
 							packet.body, buf = buf:sub(1, len), buf:sub(len + 1);
 							state = nil; success_cb(packet);
-- 
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