mirror of
https://github.com/bjc/prosody.git
synced 2025-04-04 13:47:41 +03:00
187 lines
6.6 KiB
Lua
187 lines
6.6 KiB
Lua
local tonumber = tonumber;
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local assert = assert;
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local t_insert, t_concat = table.insert, table.concat;
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local url_parse = require "socket.url".parse;
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local urldecode = require "util.http".urldecode;
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local function preprocess_path(path)
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path = urldecode((path:gsub("//+", "/")));
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if path:sub(1,1) ~= "/" then
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path = "/"..path;
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end
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local level = 0;
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for component in path:gmatch("([^/]+)/") do
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if component == ".." then
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level = level - 1;
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elseif component ~= "." then
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level = level + 1;
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end
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if level < 0 then
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return nil;
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end
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end
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return path;
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end
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local httpstream = {};
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function httpstream.new(success_cb, error_cb, parser_type, options_cb)
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local client = true;
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if not parser_type or parser_type == "server" then client = false; else assert(parser_type == "client", "Invalid parser type"); end
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local buf, buflen, buftable = {}, 0, true;
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local bodylimit = tonumber(options_cb and options_cb().body_size_limit) or 10*1024*1024;
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local buflimit = tonumber(options_cb and options_cb().buffer_size_limit) or bodylimit * 2;
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local chunked, chunk_size, chunk_start;
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local state = nil;
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local packet;
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local len;
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local have_body;
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local error;
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return {
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feed = function(_, data)
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if error then return nil, "parse has failed"; end
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if not data then -- EOF
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if buftable then buf, buftable = t_concat(buf), false; end
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if state and client and not len then -- reading client body until EOF
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packet.body = buf;
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success_cb(packet);
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elseif buf ~= "" then -- unexpected EOF
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error = true; return error_cb("unexpected-eof");
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end
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return;
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end
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if buftable then
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t_insert(buf, data);
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else
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buf = { buf, data };
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buftable = true;
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end
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buflen = buflen + #data;
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if buflen > buflimit then error = true; return error_cb("max-buffer-size-exceeded"); end
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while buflen > 0 do
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if state == nil then -- read request
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if buftable then buf, buftable = t_concat(buf), false; end
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local index = buf:find("\r\n\r\n", nil, true);
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if not index then return; end -- not enough data
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local method, path, httpversion, status_code, reason_phrase;
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local first_line;
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local headers = {};
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for line in buf:sub(1,index+1):gmatch("([^\r\n]+)\r\n") do -- parse request
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if first_line then
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local key, val = line:match("^([^%s:]+): *(.*)$");
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if not key then error = true; return error_cb("invalid-header-line"); end -- TODO handle multi-line and invalid headers
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key = key:lower();
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headers[key] = headers[key] and headers[key]..","..val or val;
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else
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first_line = line;
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if client then
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httpversion, status_code, reason_phrase = line:match("^HTTP/(1%.[01]) (%d%d%d) (.*)$");
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status_code = tonumber(status_code);
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if not status_code then error = true; return error_cb("invalid-status-line"); end
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have_body = not
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( (options_cb and options_cb().method == "HEAD")
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or (status_code == 204 or status_code == 304 or status_code == 301)
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or (status_code >= 100 and status_code < 200) );
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else
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method, path, httpversion = line:match("^(%w+) (%S+) HTTP/(1%.[01])$");
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if not method then error = true; return error_cb("invalid-status-line"); end
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end
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end
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end
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if not first_line then error = true; return error_cb("invalid-status-line"); end
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chunked = have_body and headers["transfer-encoding"] == "chunked";
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len = tonumber(headers["content-length"]); -- TODO check for invalid len
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if len and len > bodylimit then error = true; return error_cb("content-length-limit-exceeded"); end
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if client then
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-- FIXME handle '100 Continue' response (by skipping it)
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if not have_body then len = 0; end
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packet = {
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code = status_code;
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httpversion = httpversion;
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headers = headers;
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body = have_body and "" or nil;
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-- COMPAT the properties below are deprecated
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responseversion = httpversion;
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responseheaders = headers;
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};
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else
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local parsed_url;
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if path:byte() == 47 then -- starts with /
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local _path, _query = path:match("([^?]*).?(.*)");
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if _query == "" then _query = nil; end
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parsed_url = { path = _path, query = _query };
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else
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parsed_url = url_parse(path);
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if not(parsed_url and parsed_url.path) then error = true; return error_cb("invalid-url"); end
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end
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path = preprocess_path(parsed_url.path);
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headers.host = parsed_url.host or headers.host;
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len = len or 0;
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packet = {
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method = method;
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url = parsed_url;
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path = path;
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httpversion = httpversion;
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headers = headers;
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body = nil;
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};
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end
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buf = buf:sub(index + 4);
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buflen = #buf;
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state = true;
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end
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if state then -- read body
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if client then
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if chunked then
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if chunk_start and buflen - chunk_start - 2 < chunk_size then
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return;
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end -- not enough data
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if buftable then buf, buftable = t_concat(buf), false; end
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if not buf:find("\r\n", nil, true) then
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return;
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end -- not enough data
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if not chunk_size then
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chunk_size, chunk_start = buf:match("^(%x+)[^\r\n]*\r\n()");
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chunk_size = chunk_size and tonumber(chunk_size, 16);
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if not chunk_size then error = true; return error_cb("invalid-chunk-size"); end
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end
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if chunk_size == 0 and buf:find("\r\n\r\n", chunk_start-2, true) then
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state, chunk_size = nil, nil;
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buf = buf:gsub("^.-\r\n\r\n", ""); -- This ensure extensions and trailers are stripped
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success_cb(packet);
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elseif buflen - chunk_start - 2 >= chunk_size then -- we have a chunk
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packet.body = packet.body..buf:sub(chunk_start, chunk_start + (chunk_size-1));
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buf = buf:sub(chunk_start + chunk_size + 2);
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buflen = buflen - (chunk_start + chunk_size + 2 - 1);
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chunk_size, chunk_start = nil, nil;
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else -- Partial chunk remaining
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break;
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end
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elseif len and buflen >= len then
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if buftable then buf, buftable = t_concat(buf), false; end
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if packet.code == 101 then
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packet.body, buf, buflen, buftable = buf, {}, 0, true;
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else
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packet.body, buf = buf:sub(1, len), buf:sub(len + 1);
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buflen = #buf;
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end
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state = nil; success_cb(packet);
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else
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break;
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end
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elseif buflen >= len then
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if buftable then buf, buftable = t_concat(buf), false; end
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packet.body, buf = buf:sub(1, len), buf:sub(len + 1);
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buflen = #buf;
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state = nil; success_cb(packet);
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else
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break;
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end
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end
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end
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end;
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};
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end
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return httpstream;
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