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local tonumber = tonumber;
local assert = assert;
local function preprocess_path(path)
if path:sub(1,1) ~= "/" then
path = "/"..path;
end
local level = 0;
for component in path:gmatch("([^/]+)/") do
if component == ".." then
level = level - 1;
elseif component ~= "." then
level = level + 1;
end
if level < 0 then
return nil;
end
end
return path;
end
local httpstream = {};
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 state = nil;
local packet;
local len;
local have_body;
local error;
return {
feed = function(self, data)
if error then return nil, "parse has failed"; end
if not data then -- EOF
if state and client and not len then -- reading client body until EOF
packet.body = buf;
success_cb(packet);
elseif buf ~= "" then -- unexpected EOF
error = true; return error_cb();
end
return;
end
buf = buf..data;
while #buf > 0 do
if state == nil then -- read request
local index = buf:find("\r\n\r\n", nil, true);
if not index then return; end -- not enough data
local method, path, httpversion, status_code, reason_phrase;
local first_line;
local headers = {};
for line in buf:sub(1,index+1):gmatch("([^\r\n]+)\r\n") do -- parse request
if first_line then
local key, val = line:match("^([^%s:]+): *(.*)$");
if not key then error = true; return error_cb("invalid-header-line"); end -- TODO handle multi-line and invalid headers
key = key:lower();
headers[key] = headers[key] and headers[key]..","..val or val;
else
first_line = line;
if client then
httpversion, status_code, reason_phrase = line:match("^HTTP/(1%.[01]) (%d%d%d) (.*)$");
if not status_code then error = true; return error_cb("invalid-status-line"); end
have_body = not
( (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
end
end
end
len = tonumber(headers["content-length"]); -- TODO check for invalid len
if client then
-- FIXME handle '100 Continue' response (by skipping it)
if not have_body then len = 0; end
packet = {
code = status_code;
httpversion = httpversion;
headers = headers;
body = have_body and "" or nil;
-- COMPAT the properties below are deprecated
responseversion = httpversion;
responseheaders = headers;
};
else
-- path normalization
if path:match("^https?://") then
headers.host, path = path:match("^https?://([^/]*)(.*)");
end
path = preprocess_path(path);
len = len or 0;
packet = {
method = method;
path = path;
httpversion = httpversion;
headers = headers;
body = nil;
};
end
buf = buf:sub(index + 4);
state = true;
end
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);
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);
end
elseif #buf >= len then
packet.body, buf = buf:sub(1, len), buf:sub(len + 1);
state = nil; success_cb(packet);
end
end
end
end;
};
end
return httpstream;
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