moonbridge
view moonbridge_http.lua @ 195:05fd82e3cfb7
Send SIGUSR1 to all child processes on termination via SIGTERM
| author | jbe |
|---|---|
| date | Sat Jun 20 00:02:11 2015 +0200 (2015-06-20) |
| parents | ab12ecb399f1 |
| children | 281f1ac41fc6 |
line source
1 #!/usr/bin/env lua
3 -- module preamble
4 local _G, _M = _ENV, {}
5 _ENV = setmetatable({}, {
6 __index = function(self, key)
7 local value = _M[key]; if value ~= nil then return value end
8 return _G[key]
9 end,
10 __newindex = _M
11 })
13 -- function that encodes certain HTML entities:
14 -- (not used by the library itself)
15 function encode_html(text)
16 return (
17 string.gsub(
18 text, '[<>&"]',
19 function(char)
20 if char == '<' then
21 return "<"
22 elseif char == '>' then
23 return ">"
24 elseif char == '&' then
25 return "&"
26 elseif char == '"' then
27 return """
28 end
29 end
30 )
31 )
33 end
35 -- function that encodes special characters for URIs:
36 -- (not used by the library itself)
37 function encode_uri(text)
38 return (
39 string.gsub(text, "[^0-9A-Za-z_%.~-]",
40 function (char)
41 return string.format("%%%02x", string.byte(char))
42 end
43 )
44 )
45 end
47 -- function undoing URL encoding:
48 do
49 local b0 = string.byte("0")
50 local b9 = string.byte("9")
51 local bA = string.byte("A")
52 local bF = string.byte("F")
53 local ba = string.byte("a")
54 local bf = string.byte("f")
55 function decode_uri(str)
56 return (
57 string.gsub(
58 string.gsub(str, "%+", " "),
59 "%%([0-9A-Fa-f][0-9A-Fa-f])",
60 function(hex)
61 local n1, n2 = string.byte(hex, 1, 2)
62 if n1 >= b0 and n1 <= b9 then n1 = n1 - b0
63 elseif n1 >= bA and n1 <= bF then n1 = n1 - bA + 10
64 elseif n1 >= ba and n1 <= bf then n1 = n1 - ba + 10
65 else error("Assertion failed") end
66 if n2 >= b0 and n2 <= b9 then n2 = n2 - b0
67 elseif n2 >= bA and n2 <= bF then n2 = n2 - bA + 10
68 elseif n2 >= ba and n2 <= bf then n2 = n2 - ba + 10
69 else error("Assertion failed") end
70 return string.char(n1 * 16 + n2)
71 end
72 )
73 )
74 end
75 end
77 -- status codes that carry no response body (in addition to 1xx):
78 -- (set to "zero_content_length" if Content-Length header is required)
79 status_without_response_body = {
80 ["101"] = true, -- list 101 to allow protocol switch
81 ["204"] = true,
82 ["205"] = "zero_content_length",
83 ["304"] = true
84 }
86 -- handling of GET/POST param tables:
87 local new_params_list -- defined later
88 do
89 local params_list_mapping = setmetatable({}, {__mode="k"})
90 local function nextnonempty(tbl, key)
91 while true do
92 key = next(tbl, key)
93 if key == nil then
94 return nil
95 end
96 local value = tbl[key]
97 if #value > 0 then
98 return key, value
99 end
100 end
101 end
102 local function nextvalue(tbl, key)
103 while true do
104 key = next(tbl, key)
105 if key == nil then
106 return nil
107 end
108 local value = tbl[key][1]
109 if value ~= nil then
110 return key, value
111 end
112 end
113 end
114 local params_list_metatable = {
115 __index = function(self, key)
116 local tbl = {}
117 self[key] = tbl
118 return tbl
119 end,
120 __pairs = function(self)
121 return nextnonempty, self, nil
122 end
123 }
124 local params_metatable = {
125 __index = function(self, key)
126 return params_list_mapping[self][key][1]
127 end,
128 __newindex = function(self, key, value)
129 params_list_mapping[self][key] = {value}
130 end,
131 __pairs = function(self)
132 return nextvalue, params_list_mapping[self], nil
133 end
134 }
135 -- function that returns a table to store key value-list pairs,
136 -- and a second table automatically mapping keys to the first value
137 -- using the key value-list pairs in the first table:
138 new_params_list = function()
139 local params_list = setmetatable({}, params_list_metatable)
140 local params = setmetatable({}, params_metatable)
141 params_list_mapping[params] = params_list
142 return params_list, params
143 end
144 end
146 -- function parsing URL encoded form data and storing it in
147 -- a key value-list pairs structure that has to be
148 -- previously obtained by calling by new_params_list():
149 local function read_urlencoded_form(tbl, data)
150 for rawkey, rawvalue in string.gmatch(data, "([^?=&]*)=([^?=&]*)") do
151 local subtbl = tbl[decode_uri(rawkey)]
152 subtbl[#subtbl+1] = decode_uri(rawvalue)
153 end
154 end
156 -- function to convert a HTTP request handler to a socket handler:
157 function generate_handler(handler, options)
158 -- swap arguments if necessary (for convenience):
159 if type(handler) ~= "function" and type(options) == "function" then
160 handler, options = options, handler
161 end
162 -- helper function to process options:
163 local function default(name, default_value)
164 local value = options[name]
165 if value == nil then
166 return default_value
167 else
168 return value or nil
169 end
170 end
171 -- process options:
172 options = options or {}
173 local preamble = "" -- preamble sent with every(!) HTTP response
174 do
175 -- named arg "static_headers" is used to create the preamble:
176 local s = options.static_headers
177 local t = {}
178 if s then
179 if type(s) == "string" then
180 for line in string.gmatch(s, "[^\r\n]+") do
181 t[#t+1] = line
182 end
183 else
184 for i, kv in ipairs(s) do
185 if type(kv) == "string" then
186 t[#t+1] = kv
187 else
188 t[#t+1] = kv[1] .. ": " .. kv[2]
189 end
190 end
191 end
192 end
193 t[#t+1] = ""
194 preamble = table.concat(t, "\r\n")
195 end
196 local input_chunk_size = options.maximum_input_chunk_size or options.chunk_size or 16384
197 local output_chunk_size = options.minimum_output_chunk_size or options.chunk_size or 1024
198 local header_size_limit = options.header_size_limit or 1024*1024
199 local body_size_limit = options.body_size_limit or 64*1024*1024
200 local request_idle_timeout = default("request_idle_timeout", 65)
201 local request_header_timeout = default("request_header_timeout", 30)
202 local request_body_timeout = default("request_body_timeout", 300)
203 local response_timeout = default("response_timeout", 1800)
204 local poll = options.poll_function or moonbridge_io.poll
205 -- return socket handler:
206 return function(socket)
207 local socket_set = {[socket] = true} -- used for poll function
208 local survive = true -- set to false if process shall be terminated later
209 local consume -- can be set to function that reads some input if possible
210 -- function that may be used as "consume" function
211 -- and which drains some input if possible:
212 local function drain()
213 local bytes, status = socket:drain_nb(input_chunk_size)
214 if not bytes or status == "eof" then
215 consume = nil
216 end
217 end
218 -- function trying to unblock socket by reading:
219 local function unblock()
220 if consume then
221 poll(socket_set, socket_set)
222 consume()
223 else
224 poll(nil, socket_set)
225 end
226 end
227 -- function that enforces consumption of all input:
228 local function consume_all()
229 while consume do
230 poll(socket_set, nil)
231 consume()
232 end
233 end
234 -- handle requests in a loop:
235 repeat
236 -- table for caching nil values:
237 local headers_value_nil = {}
238 -- create a new request object (methods are added later):
239 local request -- allow references to local variable
240 request = {
241 -- allow access to underlying socket:
242 socket = socket,
243 -- cookies are simply stored in a table:
244 cookies = {},
245 -- table mapping header field names to value-lists
246 -- (raw access, but case-insensitive):
247 headers = setmetatable({}, {
248 __index = function(self, key)
249 assert(type(key) == "string", "Attempted to index headers table with a non-string key")
250 local lowerkey = string.lower(key)
251 local result = rawget(self, lowerkey)
252 if result == nil then
253 result = {}
254 rawset(self, lowerkey, result)
255 end
256 rawset(self, key, result)
257 return result
258 end
259 }),
260 -- table mapping header field names to value-lists
261 -- (for headers with comma separated values):
262 headers_csv_table = setmetatable({}, {
263 __index = function(self, key)
264 local result = {}
265 for i, line in ipairs(request.headers[key]) do
266 for entry in string.gmatch(line, "[^,]+") do
267 local value = string.match(entry, "^[ \t]*(..-)[ \t]*$")
268 if value then
269 result[#result+1] = value
270 end
271 end
272 end
273 self[key] = result
274 return result
275 end
276 }),
277 -- table mapping header field names to a comma separated string
278 -- (for headers with comma separated values):
279 headers_csv_string = setmetatable({}, {
280 __index = function(self, key)
281 local result = {}
282 for i, line in ipairs(request.headers[key]) do
283 result[#result+1] = line
284 end
285 result = table.concat(result, ", ")
286 self[key] = result
287 return result
288 end
289 }),
290 -- table mapping header field names to a single string value
291 -- (or false if header has been sent multiple times):
292 headers_value = setmetatable({}, {
293 __index = function(self, key)
294 if headers_value_nil[key] then
295 return nil
296 end
297 local values = request.headers_csv_table[key]
298 if #values == 0 then
299 headers_value_nil[key] = true
300 else
301 local result
302 if #values == 1 then
303 result = values[1]
304 else
305 result = false
306 end
307 self[key] = result
308 return result
309 end
310 end
311 }),
312 -- table mapping header field names to a flag table,
313 -- indicating if the comma separated value contains certain entries:
314 headers_flags = setmetatable({}, {
315 __index = function(self, key)
316 local result = setmetatable({}, {
317 __index = function(self, key)
318 assert(type(key) == "string", "Attempted to index header flag table with a non-string key")
319 local lowerkey = string.lower(key)
320 local result = rawget(self, lowerkey) or false
321 self[lowerkey] = result
322 self[key] = result
323 return result
324 end
325 })
326 for i, value in ipairs(request.headers_csv_table[key]) do
327 result[string.lower(value)] = true
328 end
329 self[key] = result
330 return result
331 end
332 })
333 }
334 -- create metatable for request object:
335 local request_mt = {}
336 setmetatable(request, request_mt)
337 -- callback for request body streaming:
338 local process_body_chunk
339 -- function to enable draining:
340 local function enable_drain()
341 consume = drain
342 process_body_chunk = nil -- allow for early garbage collection
343 end
344 -- local variables to track the state:
345 local state = "init" -- one of:
346 -- "init" (initial state)
347 -- "no_status_sent" (request body streaming config complete)
348 -- "info_status_sent" (1xx status code has been sent)
349 -- "bodyless_status_sent" (204/304 status code has been sent)
350 -- "status_sent" (regular status code has been sent)
351 -- "headers_sent" (headers have been terminated)
352 -- "finished" (request has been answered completely)
353 -- "faulty" (I/O or protocaol error)
354 local request_body_content_length -- Content-Length of request body
355 local close_requested = false -- "Connection: close" requested
356 local close_responded = false -- "Connection: close" sent
357 local content_length = nil -- value of Content-Length header sent
358 local bytes_sent = 0 -- number of bytes sent if Content-Length is set
359 local chunk_parts = {} -- list of chunks to send
360 local chunk_bytes = 0 -- sum of lengths of chunks to send
361 local streamed_post_params = {} -- mapping from POST field name to stream function
362 local streamed_post_param_patterns = {} -- list of POST field pattern and stream function pairs
363 -- function to assert non-faulty handle:
364 local function assert_not_faulty()
365 assert(state ~= "faulty", "Tried to use faulty request handle")
366 end
367 -- functions to send data to the browser:
368 local function send(...)
369 local old_state = state; state = "faulty"
370 if not socket:write_call(unblock, ...) then
371 socket:reset()
372 error("Could not send data to client: " .. errmsg)
373 end
374 state = old_state
375 end
376 local function send_flush(...)
377 local old_state = state; state = "faulty"
378 if not socket:flush_call(unblock, ...) then
379 socket:reset()
380 error("Could not send data to client: " .. errmsg)
381 end
382 state = old_state
383 end
384 -- function to assert proper finish/close/reset:
385 local function assert_close(retval, errmsg)
386 if not retval then
387 error("Could not finish sending data to client: " .. errmsg)
388 end
389 end
390 -- function to finish request:
391 local function finish()
392 if close_responded then
393 -- discard any input:
394 enable_drain()
395 -- close output stream:
396 send_flush()
397 assert_close(socket:finish())
398 -- wait for EOF from peer to avoid immediate TCP RST condition:
399 consume_all()
400 -- fully close socket:
401 assert_close(socket:close())
402 else
403 -- flush outgoing data:
404 send_flush()
405 -- consume incoming data:
406 consume_all()
407 end
408 end
409 -- function that writes out buffered chunks (without flushing the socket):
410 function send_chunk()
411 if chunk_bytes > 0 then
412 local old_state = state; state = "faulty"
413 send(string.format("%x\r\n", chunk_bytes))
414 for i = 1, #chunk_parts do
415 send(chunk_parts[i])
416 chunk_parts[i] = nil
417 end
418 chunk_bytes = 0
419 send("\r\n")
420 state = old_state
421 end
422 end
423 -- function to report an error:
424 local function request_error(throw_error, status, text)
425 if
426 state == "init" or
427 state == "no_status_sent" or
428 state == "info_status_sent"
429 then
430 local error_response_status, errmsg = pcall(function()
431 request:monologue()
432 request:send_status(status)
433 request:send_header("Content-Type", "text/plain")
434 request:send_data(status, "\n")
435 if text then
436 request:send_data("\n", text, "\n")
437 end
438 request:finish()
439 end)
440 if not error_response_status then
441 if text then
442 error("Error while sending error response (" .. status .. " / " .. text .. "): " .. errmsg)
443 else
444 error("Error while sending error response (" .. status .. "): " .. errmsg)
445 end
446 end
447 end
448 if throw_error then
449 local errmsg = "Error while reading request from client. Error response: " .. status
450 if text then
451 errmsg = errmsg .. " (" .. text .. ")"
452 end
453 error(errmsg)
454 else
455 return survive
456 end
457 end
458 -- read functions
459 local function read(...)
460 local data, status = socket:read_yield(...)
461 if data == nil then
462 request_error(true, "400 Bad Request", "Read error")
463 end
464 if status == "eof" then
465 request_error(true, "400 Bad Request", "Unexpected EOF")
466 end
467 return data
468 end
469 local function read_eof(...)
470 local data, status = socket:read_yield(...)
471 if data == nil then
472 request_error(true, "400 Bad Request", "Read error")
473 end
474 if status == "eof" then
475 if data == "" then
476 return nil
477 else
478 request_error(true, "400 Bad Request", "Unexpected EOF")
479 end
480 end
481 return data
482 end
483 -- reads a number of bytes from the socket,
484 -- optionally feeding these bytes chunk-wise into
485 -- the "process_body_chunk" callback function:
486 local function read_body_bytes(remaining)
487 while remaining > 0 do
488 local chunklen
489 if remaining > input_chunk_size then
490 chunklen = input_chunk_size
491 else
492 chunklen = remaining
493 end
494 local chunk = read(chunklen)
495 remaining = remaining - chunklen
496 if process_body_chunk then
497 process_body_chunk(chunk)
498 end
499 end
500 end
501 -- coroutine for request body processing:
502 local function read_body()
503 if request.headers_flags["Transfer-Encoding"]["chunked"] then
504 local limit = body_size_limit
505 while true do
506 local line = read(32 + limit, "\n")
507 local zeros, lenstr = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)\r?\n$")
508 local chunkext
509 if lenstr then
510 chunkext = ""
511 else
512 zeros, lenstr, chunkext = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)([ \t;].-)\r?\n$")
513 end
514 if not lenstr or #lenstr > 13 then
515 request_error(true, "400 Bad Request", "Encoding error while reading chunk of request body")
516 end
517 local len = tonumber("0x" .. lenstr)
518 limit = limit - (#zeros + #chunkext + len)
519 if limit < 0 then
520 request_error(true, "413 Request Entity Too Large", "Request body size limit exceeded")
521 end
522 if len == 0 then break end
523 read_body_bytes(len)
524 local term = read(2, "\n")
525 if term ~= "\r\n" and term ~= "\n" then
526 request_error(true, "400 Bad Request", "Encoding error while reading chunk of request body")
527 end
528 end
529 while true do
530 local line = read(2 + limit, "\n")
531 if line == "\r\n" or line == "\n" then break end
532 limit = limit - #line
533 if limit < 0 then
534 request_error(true, "413 Request Entity Too Large", "Request body size limit exceeded while reading trailer section of chunked request body")
535 end
536 end
537 elseif request_body_content_length then
538 read_body_bytes(request_body_content_length)
539 end
540 if process_body_chunk then
541 process_body_chunk(nil) -- signal EOF
542 end
543 consume = nil -- avoid further resumes
544 end
545 -- function to setup default request body handling:
546 local function default_request_body_handling()
547 local post_params_list, post_params = new_params_list()
548 local content_type = request.headers_value["Content-Type"]
549 if content_type then
550 if
551 content_type == "application/x-www-form-urlencoded" or
552 string.match(content_type, "^application/x%-www%-form%-urlencoded *;")
553 then
554 read_urlencoded_form(post_params_list, request.body)
555 request.post_params_list, request.post_params = post_params_list, post_params
556 else
557 local boundary = string.match(
558 content_type,
559 '^multipart/form%-data[ \t]*[;,][ \t]*boundary="([^"]+)"$'
560 ) or string.match(
561 content_type,
562 '^multipart/form%-data[ \t]*[;,][ \t]*boundary=([^"; \t]+)$'
563 )
564 if boundary then
565 local post_metadata_list, post_metadata = new_params_list()
566 boundary = "--" .. boundary
567 local headerdata = ""
568 local streamer
569 local field_name
570 local metadata = {}
571 local value_parts
572 local function default_streamer(chunk)
573 value_parts[#value_parts+1] = chunk
574 end
575 local function stream_part_finish()
576 if streamer == default_streamer then
577 local value = table.concat(value_parts)
578 value_parts = nil
579 if field_name then
580 local values = post_params_list[field_name]
581 values[#values+1] = value
582 local metadata_entries = post_metadata_list[field_name]
583 metadata_entries[#metadata_entries+1] = metadata
584 end
585 else
586 streamer()
587 end
588 headerdata = ""
589 streamer = nil
590 field_name = nil
591 metadata = {}
592 end
593 local function stream_part_chunk(chunk)
594 if streamer then
595 streamer(chunk)
596 else
597 headerdata = headerdata .. chunk
598 while true do
599 local line, remaining = string.match(headerdata, "^(.-)\r?\n(.*)$")
600 if not line then
601 break
602 end
603 if line == "" then
604 streamer = streamed_post_params[field_name]
605 if not streamer then
606 for i, rule in ipairs(streamed_post_param_patterns) do
607 if string.match(field_name, rule[1]) then
608 streamer = rule[2]
609 break
610 end
611 end
612 end
613 if not streamer then
614 value_parts = {}
615 streamer = default_streamer
616 end
617 streamer(remaining, field_name, metadata)
618 return
619 end
620 headerdata = remaining
621 local header_key, header_value = string.match(line, "^([^:]*):[ \t]*(.-)[ \t]*$")
622 if not header_key then
623 request_error(true, "400 Bad Request", "Invalid header in multipart/form-data part")
624 end
625 header_key = string.lower(header_key)
626 if header_key == "content-disposition" then
627 local escaped_header_value = string.gsub(header_value, '"[^"]*"', function(str)
628 return string.gsub(str, "=", "==")
629 end)
630 field_name = string.match(escaped_header_value, ';[ \t]*name="([^"]*)"')
631 if field_name then
632 field_name = string.gsub(field_name, "==", "=")
633 else
634 field_name = string.match(header_value, ';[ \t]*name=([^"; \t]+)')
635 end
636 metadata.file_name = string.match(escaped_header_value, ';[ \t]*filename="([^"]*)"')
637 if metadata.file_name then
638 metadata.file_name = string.gsub(metadata.file_name, "==", "=")
639 else
640 string.match(header_value, ';[ \t]*filename=([^"; \t]+)')
641 end
642 elseif header_key == "content-type" then
643 metadata.content_type = header_value
644 elseif header_key == "content-transfer-encoding" then
645 request_error(true, "400 Bad Request", "Content-transfer-encoding not supported by multipart/form-data parser")
646 end
647 end
648 end
649 end
650 local skippart = true -- ignore data until first boundary
651 local afterbound = false -- interpret 2 bytes after boundary ("\r\n" or "--")
652 local terminated = false -- final boundary read
653 local bigchunk = ""
654 request:stream_request_body(function(chunk)
655 if chunk == nil then
656 if not terminated then
657 request_error(true, "400 Bad Request", "Premature end of multipart/form-data request body")
658 end
659 request.post_params_list, request.post_params = post_params_list, post_params
660 request.post_metadata_list, request.post_metadata = post_metadata_list, post_metadata
661 end
662 if terminated then
663 return
664 end
665 bigchunk = bigchunk .. chunk
666 while true do
667 if afterbound then
668 if #bigchunk <= 2 then
669 return
670 end
671 local terminator = string.sub(bigchunk, 1, 2)
672 if terminator == "\r\n" then
673 afterbound = false
674 bigchunk = string.sub(bigchunk, 3)
675 elseif terminator == "--" then
676 terminated = true
677 bigchunk = nil
678 return
679 else
680 request_error(true, "400 Bad Request", "Error while parsing multipart body (expected CRLF or double minus)")
681 end
682 end
683 local pos1, pos2 = string.find(bigchunk, boundary, 1, true)
684 if not pos1 then
685 if not skippart then
686 local safe = #bigchunk-#boundary
687 if safe > 0 then
688 stream_part_chunk(string.sub(bigchunk, 1, safe))
689 bigchunk = string.sub(bigchunk, safe+1)
690 end
691 end
692 return
693 end
694 if not skippart then
695 stream_part_chunk(string.sub(bigchunk, 1, pos1 - 1))
696 stream_part_finish()
697 else
698 boundary = "\r\n" .. boundary
699 skippart = false
700 end
701 bigchunk = string.sub(bigchunk, pos2 + 1)
702 afterbound = true
703 end
704 end)
705 else
706 request_error(true, "415 Unsupported Media Type", "Unknown Content-Type of request body")
707 end
708 end
709 end
710 end
711 -- function to prepare body processing:
712 local function prepare()
713 assert_not_faulty()
714 if state ~= "init" then
715 return
716 end
717 if process_body_chunk == nil then
718 default_request_body_handling()
719 end
720 if state ~= "init" then -- re-check if state is still "init"
721 return
722 end
723 consume = coroutine.wrap(read_body)
724 state = "no_status_sent"
725 if request.headers_flags["Expect"]["100-continue"] then
726 request:send_status("100 Continue")
727 request:finish_headers()
728 end
729 end
730 -- method to ignore input and close connection after response:
731 function request:monologue()
732 assert_not_faulty()
733 if
734 state == "headers_sent" or
735 state == "finished"
736 then
737 error("All HTTP headers have already been sent")
738 end
739 local old_state = state; state = "faulty"
740 enable_drain()
741 close_requested = true
742 if old_state == "init" then
743 state = "no_status_sent"
744 else
745 state = old_state
746 end
747 end
748 -- method to send a HTTP response status (e.g. "200 OK"):
749 function request:send_status(status)
750 prepare()
751 local old_state = state; state = "faulty"
752 if old_state == "info_status_sent" then
753 send_flush("\r\n")
754 elseif old_state ~= "no_status_sent" then
755 state = old_state
756 error("HTTP status has already been sent")
757 end
758 local status1 = string.sub(status, 1, 1)
759 local status3 = string.sub(status, 1, 3)
760 send("HTTP/1.1 ", status, "\r\n", preamble)
761 local wrb = status_without_response_body[status3]
762 if wrb then
763 state = "bodyless_status_sent"
764 if wrb == "zero_content_length" then
765 request:send_header("Content-Length", 0)
766 end
767 elseif status1 == "1" then
768 state = "info_status_sent"
769 else
770 state = "status_sent"
771 end
772 end
773 -- method to send a HTTP response header:
774 -- (key and value must be provided as separate args)
775 function request:send_header(key, value)
776 assert_not_faulty()
777 if state == "init" or state == "no_status_sent" then
778 error("HTTP status has not been sent yet")
779 elseif
780 state == "headers_sent" or
781 state == "finished"
782 then
783 error("All HTTP headers have already been sent")
784 end
785 local old_state = state; state = "faulty"
786 local key_lower = string.lower(key)
787 if key_lower == "content-length" then
788 if old_state == "info_status_sent" then
789 state = old_state
790 error("Cannot set Content-Length for informational status response")
791 end
792 local cl = assert(tonumber(value), "Invalid content-length")
793 if content_length == nil then
794 content_length = cl
795 elseif content_length == cl then
796 return
797 else
798 error("Content-Length has been set multiple times with different values")
799 end
800 elseif key_lower == "connection" then
801 for entry in string.gmatch(string.lower(value), "[^,]+") do
802 if string.match(entry, "^[ \t]*close[ \t]*$") then
803 if old_state == "info_status_sent" then
804 state = old_state
805 error("Cannot set \"Connection: close\" for informational status response")
806 end
807 close_responded = true
808 break
809 end
810 end
811 end
812 send(key, ": ", value, "\r\n")
813 state = old_state
814 end
815 -- method to announce (and enforce) connection close after sending the
816 -- response:
817 function request:close_after_finish()
818 assert_not_faulty()
819 if state == "headers_sent" or state == "finished" then
820 error("All HTTP headers have already been sent")
821 end
822 close_requested = true
823 end
824 -- function to terminate header section in response, optionally flushing:
825 -- (may be called multiple times unless response is finished)
826 local function finish_headers(with_flush)
827 if state == "finished" then
828 error("Response has already been finished")
829 elseif state == "info_status_sent" then
830 state = "faulty"
831 send_flush("\r\n")
832 state = "no_status_sent"
833 elseif state == "bodyless_status_sent" then
834 if close_requested and not close_responded then
835 request:send_header("Connection", "close")
836 end
837 state = "faulty"
838 send("\r\n")
839 finish()
840 state = "finished"
841 elseif state == "status_sent" then
842 if not content_length then
843 request:send_header("Transfer-Encoding", "chunked")
844 end
845 if close_requested and not close_responded then
846 request:send_header("Connection", "close")
847 end
848 state = "faulty"
849 send("\r\n")
850 if request.method == "HEAD" then
851 finish()
852 elseif with_flush then
853 send_flush()
854 end
855 state = "headers_sent"
856 elseif state ~= "headers_sent" then
857 error("HTTP status has not been sent yet")
858 end
859 end
860 -- method to finish and flush headers:
861 function request:finish_headers()
862 assert_not_faulty()
863 finish_headers(true)
864 end
865 -- method to send body data:
866 function request:send_data(...)
867 assert_not_faulty()
868 if state == "info_status_sent" then
869 error("No (non-informational) HTTP status has been sent yet")
870 elseif state == "bodyless_status_sent" then
871 error("Cannot send response data for body-less status message")
872 end
873 finish_headers(false)
874 if state ~= "headers_sent" then
875 error("Unexpected internal status in HTTP engine")
876 end
877 if request.method == "HEAD" then
878 return
879 end
880 state = "faulty"
881 for i = 1, select("#", ...) do
882 local str = tostring(select(i, ...))
883 if #str > 0 then
884 if content_length then
885 local bytes_to_send = #str
886 if bytes_sent + bytes_to_send > content_length then
887 error("Content length exceeded")
888 else
889 send(str)
890 bytes_sent = bytes_sent + bytes_to_send
891 end
892 else
893 chunk_bytes = chunk_bytes + #str
894 chunk_parts[#chunk_parts+1] = str
895 end
896 end
897 end
898 if chunk_bytes >= output_chunk_size then
899 send_chunk()
900 end
901 state = "headers_sent"
902 end
903 -- method to flush output buffer:
904 function request:flush()
905 assert_not_faulty()
906 send_chunk()
907 send_flush()
908 end
909 -- method to finish response:
910 function request:finish()
911 assert_not_faulty()
912 if state == "finished" then
913 return
914 elseif state == "info_status_sent" then
915 error("Informational HTTP response can be finished with :finish_headers() method")
916 end
917 finish_headers(false)
918 if state == "headers_sent" then
919 if request.method ~= "HEAD" then
920 state = "faulty"
921 if content_length then
922 if bytes_sent ~= content_length then
923 error("Content length not used")
924 end
925 else
926 send_chunk()
927 send("0\r\n\r\n")
928 end
929 finish()
930 end
931 state = "finished"
932 elseif state ~= "finished" then
933 error("Unexpected internal status in HTTP engine")
934 end
935 end
936 -- method to register POST param stream handler for a single field name:
937 function request:stream_post_param(field_name, callback)
938 if state ~= "init" then
939 error("Cannot setup request body streamer at this stage anymore")
940 end
941 streamed_post_params[field_name] = callback
942 end
943 -- method to register POST param stream handler for a field name pattern:
944 function request:stream_post_params(pattern, callback)
945 if state ~= "init" then
946 error("Cannot setup request body streamer at this stage anymore")
947 end
948 streamed_post_param_patterns[#streamed_post_param_patterns+1] = {pattern, callback}
949 end
950 -- method to register request body stream handler
951 function request:stream_request_body(callback)
952 if state ~= "init" then
953 error("Cannot setup request body streamer at this stage anymore")
954 end
955 local inprogress = false
956 local eof = false
957 local buffer = {}
958 process_body_chunk = function(chunk)
959 if inprogress then
960 if chunk == nil then
961 eof = true
962 else
963 buffer[#buffer+1] = chunk
964 end
965 else
966 inprogress = true
967 callback(chunk)
968 while #buffer > 0 do
969 chunk = table.concat(buffer)
970 buffer = {}
971 callback(chunk)
972 end
973 if eof then
974 callback() -- signal EOF
975 end
976 inprogress = false
977 end
978 end
979 end
980 -- method to start reading request body
981 function request:consume_input()
982 prepare()
983 consume_all()
984 end
985 -- method to stream request body
986 function request:stream_request_body_now(callback)
987 request:stream_request_body(function(chunk)
988 if chunk ~= nil then
989 callback(chunk)
990 end
991 end)
992 request:consume_input()
993 end
994 -- metamethod to read special attibutes of request object:
995 function request_mt:__index(key, value)
996 if key == "faulty" then
997 return state == "faulty"
998 elseif key == "fresh" then
999 return state == "init" and process_body_chunk == nil
1000 elseif key == "body" then
1001 local chunks = {}
1002 request:stream_request_body_now(function(chunk)
1003 chunks[#chunks+1] = chunk
1004 end)
1005 self.body = table.concat(chunks)
1006 return self.body
1007 elseif
1008 key == "post_params_list" or key == "post_params" or
1009 key == "post_metadata_list" or key == "post_metadata"
1010 then
1011 prepare()
1012 consume_all()
1013 return rawget(self, key)
1014 end
1015 end
1016 -- variable to store request target
1017 local target
1018 -- coroutine for reading headers:
1019 local function read_headers()
1020 -- initialize limit:
1021 local limit = header_size_limit
1022 -- read and parse request line:
1023 local line = read_eof(limit, "\n")
1024 if not line then
1025 return false, survive
1026 end
1027 limit = limit - #line
1028 if limit == 0 then
1029 return false, request_error(false, "414 Request-URI Too Long")
1030 end
1031 local proto
1032 request.method, target, proto =
1033 line:match("^([^ \t\r]+)[ \t]+([^ \t\r]+)[ \t]*([^ \t\r]*)[ \t]*\r?\n$")
1034 if not request.method then
1035 return false, request_error(false, "400 Bad Request")
1036 elseif proto ~= "HTTP/1.1" then
1037 return false, request_error(false, "505 HTTP Version Not Supported")
1038 end
1039 -- read and parse headers:
1040 while true do
1041 local line = read(limit, "\n");
1042 limit = limit - #line
1043 if line == "\r\n" or line == "\n" then
1044 break
1045 end
1046 if limit == 0 then
1047 return false, request_error(false, "431 Request Header Fields Too Large")
1048 end
1049 local key, value = string.match(line, "^([^ \t\r]+):[ \t]*(.-)[ \t]*\r?\n$")
1050 if not key then
1051 return false, request_error(false, "400 Bad Request")
1052 end
1053 local values = request.headers[key]
1054 values[#values+1] = value
1055 end
1056 return true -- success
1057 end
1058 -- wait for input:
1059 if not poll(socket_set, nil, request_idle_timeout) then
1060 return request_error(false, "408 Request Timeout", "Idle connection timed out")
1061 end
1062 -- read headers (with timeout):
1063 do
1064 local coro = coroutine.wrap(read_headers)
1065 local starttime = request_header_timeout and moonbridge_io.timeref()
1066 while true do
1067 local status, retval = coro()
1068 if status == nil then
1069 local remaining
1070 if request_header_timeout then
1071 remaining = request_header_timeout - moonbridge_io.timeref(starttime)
1072 end
1073 if not poll(socket_set, nil, remaining) then
1074 return request_error(false, "408 Request Timeout", "Timeout while receiving headers")
1075 end
1076 elseif status == false then
1077 return retval
1078 elseif status == true then
1079 break
1080 else
1081 error("Unexpected yield value")
1082 end
1083 end
1084 end
1085 -- process "Connection: close" header if existent:
1086 connection_close_requested = request.headers_flags["Connection"]["close"]
1087 -- process "Content-Length" header if existent:
1088 do
1089 local values = request.headers_csv_table["Content-Length"]
1090 if #values > 0 then
1091 request_body_content_length = tonumber(values[1])
1092 local proper_value = tostring(request_body_content_length)
1093 for i, value in ipairs(values) do
1094 value = string.match(value, "^0*(.*)")
1095 if value ~= proper_value then
1096 return request_error(false, "400 Bad Request", "Content-Length header(s) invalid")
1097 end
1098 end
1099 if request_body_content_length > body_size_limit then
1100 return request_error(false, "413 Request Entity Too Large", "Announced request body size is too big")
1101 end
1102 end
1103 end
1104 -- process "Transfer-Encoding" header if existent:
1105 do
1106 local flag = request.headers_flags["Transfer-Encoding"]["chunked"]
1107 local list = request.headers_csv_table["Transfer-Encoding"]
1108 if (flag and #list ~= 1) or (not flag and #list ~= 0) then
1109 return request_error(false, "400 Bad Request", "Unexpected Transfer-Encoding")
1110 end
1111 end
1112 -- process "Expect" header if existent:
1113 for i, value in ipairs(request.headers_csv_table["Expect"]) do
1114 if string.lower(value) ~= "100-continue" then
1115 return request_error(false, "417 Expectation Failed", "Unexpected Expect header")
1116 end
1117 end
1118 -- get mandatory Host header according to RFC 7230:
1119 request.host = request.headers_value["Host"]
1120 if not request.host then
1121 return request_error(false, "400 Bad Request", "No valid host header")
1122 end
1123 -- parse request target:
1124 request.path, request.query = string.match(target, "^/([^?]*)(.*)$")
1125 if not request.path then
1126 local host2
1127 host2, request.path, request.query = string.match(target, "^[Hh][Tt][Tt][Pp]://([^/?]+)/?([^?]*)(.*)$")
1128 if host2 then
1129 if request.host ~= host2 then
1130 return request_error(false, "400 Bad Request", "No valid host header")
1131 end
1132 elseif not (target == "*" and request.method == "OPTIONS") then
1133 return request_error(false, "400 Bad Request", "Invalid request target")
1134 end
1135 end
1136 -- parse GET params:
1137 if request.query then
1138 read_urlencoded_form(request.get_params_list, request.query)
1139 end
1140 -- parse cookies:
1141 for i, line in ipairs(request.headers["Cookie"]) do
1142 for rawkey, rawvalue in
1143 string.gmatch(line, "([^=; ]*)=([^=; ]*)")
1144 do
1145 request.cookies[decode_uri(rawkey)] = decode_uri(rawvalue)
1146 end
1147 end
1148 -- (re)set timeout for handler:
1149 timeout(response_timeout or 0)
1150 -- call underlying handler and remember boolean result:
1151 if handler(request) ~= true then survive = false end
1152 -- finish request (unless already done by underlying handler):
1153 request:finish()
1154 -- stop timeout timer:
1155 timeout(0)
1156 until close_responded
1157 return survive
1158 end
1159 end
1161 return _M