moonbridge

view moonbridge_http.lua @ 179:77d8fdd124e6

Throw error if key is not a string when accessing headers table
author jbe
date Thu Jun 18 22:38:53 2015 +0200 (2015-06-18)
parents f6eea95879d4
children 31820816f554
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 "&lt;"
22 elseif char == '>' then
23 return "&gt;"
24 elseif char == '&' then
25 return "&amp;"
26 elseif char == '"' then
27 return "&quot;"
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 if type(key) ~= "string" then
250 error("Attempted to index headers table with a non-string key")
251 end
252 local lowerkey = string.lower(key)
253 local result = rawget(self, lowerkey)
254 if result == nil then
255 result = {}
256 rawset(self, lowerkey, result)
257 end
258 rawset(self, key, result)
259 return result
260 end
261 }),
262 -- table mapping header field names to value-lists
263 -- (for headers with comma separated values):
264 headers_csv_table = setmetatable({}, {
265 __index = function(self, key)
266 local result = {}
267 for i, line in ipairs(request.headers[key]) do
268 for entry in string.gmatch(line, "[^,]+") do
269 local value = string.match(entry, "^[ \t]*(..-)[ \t]*$")
270 if value then
271 result[#result+1] = value
272 end
273 end
274 end
275 self[key] = result
276 return result
277 end
278 }),
279 -- table mapping header field names to a comma separated string
280 -- (for headers with comma separated values):
281 headers_csv_string = setmetatable({}, {
282 __index = function(self, key)
283 local result = {}
284 for i, line in ipairs(request.headers[key]) do
285 result[#result+1] = line
286 end
287 result = table.concat(result, ", ")
288 self[key] = result
289 return result
290 end
291 }),
292 -- table mapping header field names to a single string value
293 -- (or false if header has been sent multiple times):
294 headers_value = setmetatable({}, {
295 __index = function(self, key)
296 if headers_value_nil[key] then
297 return nil
298 end
299 local result = nil
300 local values = request.headers_csv_table[key]
301 if #values == 0 then
302 headers_value_nil[key] = true
303 elseif #values == 1 then
304 result = values[1]
305 else
306 result = false
307 end
308 self[key] = result
309 return result
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 local lowerkey = string.lower(key)
319 local result = rawget(self, lowerkey) or false
320 self[lowerkey] = result
321 self[key] = result
322 return result
323 end
324 })
325 for i, value in ipairs(request.headers_csv_table[key]) do
326 result[string.lower(value)] = true
327 end
328 self[key] = result
329 return result
330 end
331 })
332 }
333 -- create metatable for request object:
334 local request_mt = {}
335 setmetatable(request, request_mt)
336 -- callback for request body streaming:
337 local process_body_chunk
338 -- local variables to track the state:
339 local state = "init" -- one of:
340 -- "init" (initial state)
341 -- "no_status_sent" (configuration complete)
342 -- "info_status_sent" (1xx status code has been sent)
343 -- "bodyless_status_sent" (204/304 status code has been sent)
344 -- "status_sent" (regular status code has been sent)
345 -- "headers_sent" (headers have been terminated)
346 -- "finished" (request has been answered completely)
347 -- "faulty" (I/O or protocaol error)
348 local close_requested = false -- "Connection: close" requested
349 local close_responded = false -- "Connection: close" sent
350 local content_length = nil -- value of Content-Length header sent
351 local chunk_parts = {} -- list of chunks to send
352 local chunk_bytes = 0 -- sum of lengths of chunks to send
353 local streamed_post_params = {} -- mapping from POST field name to stream function
354 local streamed_post_param_patterns = {} -- list of POST field pattern and stream function pairs
355 -- functions to assert proper output/closing:
356 local function assert_output(...)
357 local retval, errmsg = ...
358 if retval then return ... end
359 state = "faulty"
360 socket:reset()
361 error("Could not send data to client: " .. errmsg)
362 end
363 local function assert_close(...)
364 local retval, errmsg = ...
365 if retval then return ... end
366 state = "faulty"
367 error("Could not finish sending data to client: " .. errmsg)
368 end
369 -- function to assert non-faulty handle:
370 local function assert_not_faulty()
371 assert(state ~= "faulty", "Tried to use faulty request handle")
372 end
373 -- functions to send data to the browser:
374 local function send(...)
375 assert_output(socket:write_call(unblock, ...))
376 end
377 local function send_flush(...)
378 assert_output(socket:flush_call(unblock, ...))
379 end
380 -- function to finish request:
381 local function finish()
382 if close_responded then
383 -- discard any input:
384 consume = drain
385 -- close output stream:
386 send_flush()
387 assert_close(socket:finish())
388 -- wait for EOF of peer to avoid immediate TCP RST condition:
389 consume_all()
390 -- fully close socket:
391 assert_close(socket:close())
392 else
393 send_flush()
394 process_body_chunk = nil
395 consume_all()
396 end
397 end
398 -- function that writes out buffered chunks (without flushing the socket):
399 function send_chunk()
400 if chunk_bytes > 0 then
401 assert_output(socket:write(string.format("%x\r\n", chunk_bytes)))
402 for i = 1, #chunk_parts do -- TODO: evaluated only once?
403 send(chunk_parts[i])
404 chunk_parts[i] = nil
405 end
406 chunk_bytes = 0
407 send("\r\n")
408 end
409 end
410 -- function to report an error:
411 local function request_error(throw_error, status, text)
412 local errmsg = "Error while reading request from client. Error response: " .. status
413 if text then
414 errmsg = errmsg .. " (" .. text .. ")"
415 end
416 if
417 state == "init" or
418 state == "no_status_sent" or
419 state == "info_status_sent"
420 then
421 local error_response_status, errmsg2 = pcall(function()
422 request:monologue()
423 request:send_status(status)
424 request:send_header("Content-Type", "text/plain")
425 request:send_data(status, "\n")
426 if text then
427 request:send_data("\n", text, "\n")
428 end
429 request:finish()
430 end)
431 if not error_response_status then
432 error("Unexpected error while sending error response: " .. errmsg2)
433 end
434 elseif state ~= "faulty" then
435 state = "faulty"
436 assert_close(socket:reset())
437 end
438 if throw_error then
439 error(errmsg)
440 else
441 return survive
442 end
443 end
444 -- read functions
445 local function read(...)
446 local data, status = socket:read_yield(...)
447 if data == nil then
448 request_error(true, "400 Bad Request", "Read error")
449 end
450 if status == "eof" then
451 request_error(true, "400 Bad Request", "Unexpected EOF")
452 end
453 return data
454 end
455 local function read_eof(...)
456 local data, status = socket:read_yield(...)
457 if data == nil then
458 request_error(true, "400 Bad Request", "Read error")
459 end
460 if status == "eof" then
461 if data == "" then
462 return nil
463 else
464 request_error(true, "400 Bad Request", "Unexpected EOF")
465 end
466 end
467 return data
468 end
469 -- reads a number of bytes from the socket,
470 -- optionally feeding these bytes chunk-wise
471 -- into a callback function:
472 local function read_body_bytes(remaining)
473 while remaining > 0 do
474 local limit
475 if remaining > input_chunk_size then
476 limit = input_chunk_size
477 else
478 limit = remaining
479 end
480 local chunk = read(limit)
481 remaining = remaining - limit
482 if process_body_chunk then
483 process_body_chunk(chunk)
484 end
485 end
486 end
487 -- coroutine for request body processing:
488 local function read_body()
489 if request.headers_flags["Transfer-Encoding"]["chunked"] then
490 local limit = body_size_limit
491 while true do
492 local line = read(32 + limit, "\n")
493 local zeros, lenstr = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)\r?\n$")
494 local chunkext
495 if lenstr then
496 chunkext = ""
497 else
498 zeros, lenstr, chunkext = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)([ \t;].-)\r?\n$")
499 end
500 if not lenstr or #lenstr > 13 then
501 request_error(true, "400 Bad Request", "Encoding error while reading chunk of request body")
502 end
503 local len = tonumber("0x" .. lenstr)
504 limit = limit - (#zeros + #chunkext + len)
505 if limit < 0 then
506 request_error(true, "413 Request Entity Too Large", "Request body size limit exceeded")
507 end
508 if len == 0 then break end
509 read_body_bytes(len)
510 local term = read(2, "\n")
511 if term ~= "\r\n" and term ~= "\n" then
512 request_error(true, "400 Bad Request", "Encoding error while reading chunk of request body")
513 end
514 end
515 while true do
516 local line = read(2 + limit, "\n")
517 if line == "\r\n" or line == "\n" then break end
518 limit = limit - #line
519 if limit < 0 then
520 request_error(true, "413 Request Entity Too Large", "Request body size limit exceeded while reading trailer section of chunked request body")
521 end
522 end
523 elseif request_body_content_length then
524 read_body_bytes(request_body_content_length)
525 end
526 end
527 -- function to setup default request body handling:
528 local function default_request_body_handling()
529 local post_params_list, post_params = new_params_list()
530 local content_type = request.headers_value["Content-Type"]
531 if content_type then
532 if
533 content_type == "application/x-www-form-urlencoded" or
534 string.match(content_type, "^application/x%-www%-form%-urlencoded *;")
535 then
536 read_urlencoded_form(post_params_list, request.body)
537 request.post_params_list, request.post_params = post_params_list, post_params
538 else
539 local boundary = string.match(
540 content_type,
541 '^multipart/form%-data[ \t]*[;,][ \t]*boundary="([^"]+)"$'
542 ) or string.match(
543 content_type,
544 '^multipart/form%-data[ \t]*[;,][ \t]*boundary=([^"; \t]+)$'
545 )
546 if boundary then
547 local post_metadata_list, post_metadata = new_params_list()
548 boundary = "--" .. boundary
549 local headerdata = ""
550 local streamer
551 local field_name
552 local metadata = {}
553 local value_parts
554 local function default_streamer(chunk)
555 value_parts[#value_parts+1] = chunk
556 end
557 local function stream_part_finish()
558 if streamer == default_streamer then
559 local value = table.concat(value_parts)
560 value_parts = nil
561 if field_name then
562 local values = post_params_list[field_name]
563 values[#values+1] = value
564 local metadata_entries = post_metadata_list[field_name]
565 metadata_entries[#metadata_entries+1] = metadata
566 end
567 else
568 streamer()
569 end
570 headerdata = ""
571 streamer = nil
572 field_name = nil
573 metadata = {}
574 end
575 local function stream_part_chunk(chunk)
576 if streamer then
577 streamer(chunk)
578 else
579 headerdata = headerdata .. chunk
580 while true do
581 local line, remaining = string.match(headerdata, "^(.-)\r?\n(.*)$")
582 if not line then
583 break
584 end
585 if line == "" then
586 streamer = streamed_post_params[field_name]
587 if not streamer then
588 for i, rule in ipairs(streamed_post_param_patterns) do
589 if string.match(field_name, rule[1]) then
590 streamer = rule[2]
591 break
592 end
593 end
594 end
595 if not streamer then
596 value_parts = {}
597 streamer = default_streamer
598 end
599 streamer(remaining, field_name, metadata)
600 return
601 end
602 headerdata = remaining
603 local header_key, header_value = string.match(line, "^([^:]*):[ \t]*(.-)[ \t]*$")
604 if not header_key then
605 request_error(true, "400 Bad Request", "Invalid header in multipart/form-data part")
606 end
607 header_key = string.lower(header_key)
608 if header_key == "content-disposition" then
609 local escaped_header_value = string.gsub(header_value, '"[^"]*"', function(str)
610 return string.gsub(str, "=", "==")
611 end)
612 field_name = string.match(escaped_header_value, ';[ \t]*name="([^"]*)"')
613 if field_name then
614 field_name = string.gsub(field_name, "==", "=")
615 else
616 field_name = string.match(header_value, ';[ \t]*name=([^"; \t]+)')
617 end
618 metadata.file_name = string.match(escaped_header_value, ';[ \t]*filename="([^"]*)"')
619 if metadata.file_name then
620 metadata.file_name = string.gsub(metadata.file_name, "==", "=")
621 else
622 string.match(header_value, ';[ \t]*filename=([^"; \t]+)')
623 end
624 elseif header_key == "content-type" then
625 metadata.content_type = header_value
626 elseif header_key == "content-transfer-encoding" then
627 request_error(true, "400 Bad Request", "Content-transfer-encoding not supported by multipart/form-data parser")
628 end
629 end
630 end
631 end
632 local skippart = true -- ignore data until first boundary
633 local afterbound = false -- interpret 2 bytes after boundary ("\r\n" or "--")
634 local terminated = false -- final boundary read
635 local bigchunk = ""
636 request:set_request_body_streamer(function(chunk)
637 if chunk == nil then
638 if not terminated then
639 request_error(true, "400 Bad Request", "Premature end of multipart/form-data request body")
640 end
641 request.post_metadata_list, request.post_metadata = post_metadata_list, post_metadata
642 end
643 if terminated then
644 return
645 end
646 bigchunk = bigchunk .. chunk
647 while true do
648 if afterbound then
649 if #bigchunk <= 2 then
650 return
651 end
652 local terminator = string.sub(bigchunk, 1, 2)
653 if terminator == "\r\n" then
654 afterbound = false
655 bigchunk = string.sub(bigchunk, 3)
656 elseif terminator == "--" then
657 terminated = true
658 bigchunk = nil
659 return
660 else
661 request_error(true, "400 Bad Request", "Error while parsing multipart body (expected CRLF or double minus)")
662 end
663 end
664 local pos1, pos2 = string.find(bigchunk, boundary, 1, true)
665 if not pos1 then
666 if not skippart then
667 local safe = #bigchunk-#boundary
668 if safe > 0 then
669 stream_part_chunk(string.sub(bigchunk, 1, safe))
670 bigchunk = string.sub(bigchunk, safe+1)
671 end
672 end
673 return
674 end
675 if not skippart then
676 stream_part_chunk(string.sub(bigchunk, 1, pos1 - 1))
677 stream_part_finish()
678 else
679 boundary = "\r\n" .. boundary
680 skippart = false
681 end
682 bigchunk = string.sub(bigchunk, pos2 + 1)
683 afterbound = true
684 end
685 end)
686 else
687 request_error(true, "415 Unsupported Media Type", "Unknown Content-Type of request body")
688 end
689 end
690 end
691 end
692 -- function to prepare body processing:
693 local function prepare()
694 assert_not_faulty()
695 if process_body_chunk == nil then
696 default_request_body_handling()
697 end
698 if state ~= "init" then
699 return
700 end
701 consume = coroutine.wrap(read_body)
702 state = "no_status_sent"
703 if request.headers_flags["Expect"]["100-continue"] then
704 request:send_status("100 Continue")
705 request:finish_headers()
706 end
707 end
708 -- method to ignore input and close connection after response:
709 function request:monologue()
710 assert_not_faulty()
711 if
712 state == "headers_sent" or
713 state == "finished"
714 then
715 error("All HTTP headers have already been sent")
716 end
717 local old_state = state
718 state = "faulty"
719 consume = drain
720 close_requested = true
721 if old_state == "init" then
722 state = "no_status_sent"
723 else
724 state = old_state
725 end
726 end
727 --
728 -- method to send a HTTP response status (e.g. "200 OK"):
729 function request:send_status(status)
730 prepare()
731 local old_state = state
732 state = "faulty"
733 if old_state == "info_status_sent" then
734 send_flush("\r\n")
735 elseif old_state ~= "no_status_sent" then
736 error("HTTP status has already been sent")
737 end
738 local status1 = string.sub(status, 1, 1)
739 local status3 = string.sub(status, 1, 3)
740 send("HTTP/1.1 ", status, "\r\n", preamble)
741 local wrb = status_without_response_body[status3]
742 if wrb then
743 state = "bodyless_status_sent"
744 if wrb == "zero_content_length" then
745 request:send_header("Content-Length", 0)
746 end
747 elseif status1 == "1" then
748 state = "info_status_sent"
749 else
750 state = "status_sent"
751 end
752 end
753 -- method to send a HTTP response header:
754 -- (key and value must be provided as separate args)
755 function request:send_header(key, value)
756 assert_not_faulty()
757 if state == "init" or state == "no_status_sent" then
758 error("HTTP status has not been sent yet")
759 elseif
760 state == "headers_sent" or
761 state == "finished"
762 then
763 error("All HTTP headers have already been sent")
764 end
765 local key_lower = string.lower(key)
766 if key_lower == "content-length" then
767 if state == "info_status_sent" then
768 error("Cannot set Content-Length for informational status response")
769 end
770 local cl = assert(tonumber(value), "Invalid content-length")
771 if content_length == nil then
772 content_length = cl
773 elseif content_length == cl then
774 return
775 else
776 error("Content-Length has been set multiple times with different values")
777 end
778 elseif key_lower == "connection" then
779 for entry in string.gmatch(string.lower(value), "[^,]+") do
780 if string.match(entry, "^[ \t]*close[ \t]*$") then
781 if state == "info_status_sent" then
782 error("Cannot set \"Connection: close\" for informational status response")
783 end
784 close_responded = true
785 break
786 end
787 end
788 end
789 assert_output(socket:write(key, ": ", value, "\r\n"))
790 end
791 -- function to terminate header section in response, optionally flushing:
792 -- (may be called multiple times unless response is finished)
793 local function finish_headers(with_flush)
794 if state == "finished" then
795 error("Response has already been finished")
796 elseif state == "info_status_sent" then
797 send_flush("\r\n")
798 state = "no_status_sent"
799 elseif state == "bodyless_status_sent" then
800 if close_requested and not close_responded then
801 request:send_header("Connection", "close")
802 end
803 send("\r\n")
804 finish()
805 state = "finished"
806 elseif state == "status_sent" then
807 if not content_length then
808 request:send_header("Transfer-Encoding", "chunked")
809 end
810 if close_requested and not close_responded then
811 request:send_header("Connection", "close")
812 end
813 send("\r\n")
814 if request.method == "HEAD" then
815 finish()
816 elseif with_flush then
817 send_flush()
818 end
819 state = "headers_sent"
820 elseif state ~= "headers_sent" then
821 error("HTTP status has not been sent yet")
822 end
823 end
824 -- method to finish and flush headers:
825 function request:finish_headers()
826 assert_not_faulty()
827 finish_headers(true)
828 end
829 -- method to send body data:
830 function request:send_data(...)
831 assert_not_faulty()
832 if output_state == "info_status_sent" then
833 error("No (non-informational) HTTP status has been sent yet")
834 elseif output_state == "bodyless_status_sent" then
835 error("Cannot send response data for body-less status message")
836 end
837 finish_headers(false)
838 if output_state ~= "headers_sent" then
839 error("Unexpected internal status in HTTP engine")
840 end
841 if request.method == "HEAD" then
842 return
843 end
844 for i = 1, select("#", ...) do
845 local str = tostring(select(i, ...))
846 if #str > 0 then
847 if content_length then
848 local bytes_to_send = #str
849 if bytes_sent + bytes_to_send > content_length then
850 error("Content length exceeded")
851 else
852 send(str)
853 bytes_sent = bytes_sent + bytes_to_send
854 end
855 else
856 chunk_bytes = chunk_bytes + #str
857 chunk_parts[#chunk_parts+1] = str
858 end
859 end
860 end
861 if chunk_bytes >= output_chunk_size then
862 send_chunk()
863 end
864 end
865 -- method to flush output buffer:
866 function request:flush()
867 assert_not_faulty()
868 send_chunk()
869 send_flush()
870 end
871 -- method to finish response:
872 function request:finish()
873 assert_not_faulty()
874 if state == "finished" then
875 return
876 elseif state == "info_status_sent" then
877 error("Informational HTTP response can be finished with :finish_headers() method")
878 end
879 finish_headers(false)
880 if state == "headers_sent" then
881 if request.method ~= "HEAD" then
882 state = "faulty"
883 if content_length then
884 if bytes_sent ~= content_length then
885 error("Content length not used")
886 end
887 else
888 send_chunk()
889 send("0\r\n\r\n")
890 end
891 finish()
892 end
893 state = "finished"
894 elseif state ~= "finished" then
895 error("Unexpected internal status in HTTP engine")
896 end
897 end
898 -- method to register POST param stream handler for a single field name:
899 function request:stream_post_param(field_name, callback)
900 if state ~= "init" then
901 error("Cannot setup request body streamer at this stage")
902 end
903 streamed_post_params[field_name] = callback
904 end
905 -- method to register POST param stream handler for a field name pattern:
906 function request:stream_post_params(pattern, callback)
907 if state ~= "init" then
908 error("Cannot setup request body streamer at this stage")
909 end
910 streamed_post_param_patterns[#streamed_post_param_patterns+1] = {pattern, callback}
911 end
912 -- method to register request body stream handler
913 function request:set_request_body_streamer(callback)
914 if state ~= "init" then
915 error("Cannot setup request body streamer at this stage")
916 end
917 local inprogress = false
918 local buffer = {}
919 process_body_chunk = function(chunk)
920 if inprogress then
921 buffer[#buffer+1] = chunk
922 else
923 inprogress = true
924 callback(chunk)
925 while #buffer > 0 do
926 chunk = table.concat(buffer)
927 buffer = {}
928 callback(chunk)
929 end
930 inprogress = false
931 end
932 end
933 end
934 -- method to start reading request body
935 function request:consume_input()
936 prepare()
937 consume_all()
938 end
939 -- method to stream request body
940 function request:stream_request_body(callback)
941 request:set_request_body_streamer(function(chunk)
942 if chunk ~= nil then
943 callback(chunk)
944 end
945 end)
946 request:consume_input()
947 end
948 -- metamethod to read special attibutes of request object:
949 function request_mt:__index(key, value)
950 if key == "body" then
951 local chunks = {}
952 request:stream_request_body(function(chunk)
953 chunks[#chunks+1] = chunk
954 end)
955 self.body = table.concat(chunks)
956 return self.body
957 elseif
958 key == "post_params_list" or key == "post_params" or
959 key == "post_metadata_list" or key == "post_metadata"
960 then
961 prepare()
962 consume_all()
963 return self[key]
964 end
965 end
966 -- coroutine for reading headers:
967 local function read_headers()
968 -- initialize limit:
969 local limit = header_size_limit
970 -- read and parse request line:
971 local line = read_eof(limit, "\n")
972 if not line then
973 return false, survive
974 end
975 limit = limit - #line
976 if limit == 0 then
977 return false, request_error(false, "414 Request-URI Too Long")
978 end
979 local target, proto
980 request.method, target, proto =
981 line:match("^([^ \t\r]+)[ \t]+([^ \t\r]+)[ \t]*([^ \t\r]*)[ \t]*\r?\n$")
982 if not request.method then
983 return false, request_error(false, "400 Bad Request")
984 elseif proto ~= "HTTP/1.1" then
985 return false, request_error(false, "505 HTTP Version Not Supported")
986 end
987 -- read and parse headers:
988 while true do
989 local line = read(limit, "\n");
990 limit = limit - #line
991 if line == "\r\n" or line == "\n" then
992 break
993 end
994 if limit == 0 then
995 return false, request_error(false, "431 Request Header Fields Too Large")
996 end
997 local key, value = string.match(line, "^([^ \t\r]+):[ \t]*(.-)[ \t]*\r?\n$")
998 if not key then
999 return false, request_error(false, "400 Bad Request")
1000 end
1001 local values = request.headers[key]
1002 values[#values+1] = value
1003 end
1004 return true -- success
1005 end
1006 -- wait for input:
1007 if not poll(socket_set, nil, request_idle_timeout) then
1008 return request_error(false, "408 Request Timeout", "Idle connection timed out")
1009 end
1010 -- read headers (with timeout):
1011 do
1012 local coro = coroutine.wrap(read_headers)
1013 local starttime = request_header_timeout and moonbridge_io.timeref()
1014 while true do
1015 local status, retval = coro()
1016 if status == nil then
1017 local remaining
1018 if request_header_timeout then
1019 remaining = request_header_timeout - moonbridge_io.timeref(starttime)
1020 end
1021 if not poll(socket_set, nil, remaining) then
1022 return request_error(false, "408 Request Timeout", "Timeout while receiving headers")
1023 end
1024 elseif status == false then
1025 return retval
1026 elseif status == true then
1027 break
1028 else
1029 error("Unexpected yield value")
1030 end
1031 end
1032 end
1033 -- process "Connection: close" header if existent:
1034 connection_close_requested = request.headers_flags["Connection"]["close"]
1035 -- process "Content-Length" header if existent:
1036 do
1037 local values = request.headers_csv_table["Content-Length"]
1038 if #values > 0 then
1039 request_body_content_length = tonumber(values[1])
1040 local proper_value = tostring(request_body_content_length)
1041 for i, value in ipairs(values) do
1042 value = string.match(value, "^0*(.*)")
1043 if value ~= proper_value then
1044 return request_error(false, "400 Bad Request", "Content-Length header(s) invalid")
1045 end
1046 end
1047 if request_body_content_length > body_size_limit then
1048 return request_error(false, "413 Request Entity Too Large", "Announced request body size is too big")
1049 end
1050 end
1051 end
1052 -- process "Transfer-Encoding" header if existent:
1053 do
1054 local flag = request.headers_flags["Transfer-Encoding"]["chunked"]
1055 local list = request.headers_csv_table["Transfer-Encoding"]
1056 if (flag and #list ~= 1) or (not flag and #list ~= 0) then
1057 return request_error(false, "400 Bad Request", "Unexpected Transfer-Encoding")
1058 end
1059 end
1060 -- process "Expect" header if existent:
1061 for i, value in ipairs(request.headers_csv_table["Expect"]) do
1062 if string.lower(value) ~= "100-continue" then
1063 return request_error(false, "417 Expectation Failed", "Unexpected Expect header")
1064 end
1065 end
1066 -- get mandatory Host header according to RFC 7230:
1067 request.host = request.headers_value["Host"]
1068 if not request.host then
1069 return request_error(false, "400 Bad Request", "No valid host header")
1070 end
1071 -- parse request target:
1072 request.path, request.query = string.match(target, "^/([^?]*)(.*)$")
1073 if not request.path then
1074 local host2
1075 host2, request.path, request.query = string.match(target, "^[Hh][Tt][Tt][Pp]://([^/?]+)/?([^?]*)(.*)$")
1076 if host2 then
1077 if request.host ~= host2 then
1078 return request_error(false, "400 Bad Request", "No valid host header")
1079 end
1080 elseif not (target == "*" and request.method == "OPTIONS") then
1081 return request_error(false, "400 Bad Request", "Invalid request target")
1082 end
1083 end
1084 -- parse GET params:
1085 if request.query then
1086 read_urlencoded_form(request.get_params_list, request.query)
1087 end
1088 -- parse cookies:
1089 for i, line in ipairs(request.headers["Cookie"]) do
1090 for rawkey, rawvalue in
1091 string.gmatch(line, "([^=; ]*)=([^=; ]*)")
1092 do
1093 request.cookies[decode_uri(rawkey)] = decode_uri(rawvalue)
1094 end
1095 end
1096 -- (re)set timeout for handler:
1097 timeout(response_timeout or 0)
1098 -- call underlying handler and remember boolean result:
1099 if handler(request) ~= true then survive = false end
1100 -- finish request (unless already done by underlying handler):
1101 request:finish()
1102 -- stop timeout timer:
1103 timeout(0)
1104 until close_responded
1105 return survive
1106 end
1107 end
1109 return _M

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