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-rw-r--r--net/http/parser.lua116
1 files changed, 116 insertions, 0 deletions
diff --git a/net/http/parser.lua b/net/http/parser.lua
new file mode 100644
index 00000000..c98c75af
--- /dev/null
+++ b/net/http/parser.lua
@@ -0,0 +1,116 @@
+
+local tonumber = tonumber;
+local assert = assert;
+
+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
+ path = path:gsub("^//+", "/"); -- TODO parse url more
+ 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
+ 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;