moonbridge

annotate moonbridge_http.lua @ 54:e3df61bf62f4

find changesets by author, revision, files, or words in the commit message
Adjusted HTTP timeouts
author jbe
date Sun Mar 22 16:17:14 2015 +0100 (2015-03-22)
parents aaf67ef45c22
children 7a385a440fa1
rev   line source
jbe@0 1 #!/usr/bin/env lua
jbe@0 2
jbe@0 3 -- module preamble
jbe@0 4 local _G, _M = _ENV, {}
jbe@0 5 _ENV = setmetatable({}, {
jbe@0 6 __index = function(self, key)
jbe@0 7 local value = _M[key]; if value ~= nil then return value end
jbe@0 8 return _G[key]
jbe@0 9 end,
jbe@0 10 __newindex = function(self, key, value) _M[key] = value end
jbe@0 11 })
jbe@0 12
jbe@0 13 -- function that encodes certain HTML entities:
jbe@0 14 -- (not used by the library itself)
jbe@0 15 function encode_html(text)
jbe@0 16 return (
jbe@0 17 string.gsub(
jbe@0 18 text, '[<>&"]',
jbe@0 19 function(char)
jbe@0 20 if char == '<' then
jbe@0 21 return "&lt;"
jbe@0 22 elseif char == '>' then
jbe@0 23 return "&gt;"
jbe@0 24 elseif char == '&' then
jbe@0 25 return "&amp;"
jbe@0 26 elseif char == '"' then
jbe@0 27 return "&quot;"
jbe@0 28 end
jbe@0 29 end
jbe@0 30 )
jbe@0 31 )
jbe@0 32
jbe@0 33 end
jbe@0 34
jbe@0 35 -- function that encodes special characters for URIs:
jbe@0 36 -- (not used by the library itself)
jbe@0 37 function encode_uri(text)
jbe@0 38 return (
jbe@0 39 string.gsub(text, "[^0-9A-Za-z_%.~-]",
jbe@0 40 function (char)
jbe@0 41 return string.format("%%%02x", string.byte(char))
jbe@0 42 end
jbe@0 43 )
jbe@0 44 )
jbe@0 45 end
jbe@0 46
jbe@0 47 -- function undoing URL encoding:
jbe@0 48 do
jbe@0 49 local b0 = string.byte("0")
jbe@0 50 local b9 = string.byte("9")
jbe@0 51 local bA = string.byte("A")
jbe@0 52 local bF = string.byte("F")
jbe@0 53 local ba = string.byte("a")
jbe@0 54 local bf = string.byte("f")
jbe@0 55 function decode_uri(str)
jbe@0 56 return (
jbe@0 57 string.gsub(
jbe@0 58 string.gsub(str, "%+", " "),
jbe@0 59 "%%([0-9A-Fa-f][0-9A-Fa-f])",
jbe@0 60 function(hex)
jbe@0 61 local n1, n2 = string.byte(hex, 1, 2)
jbe@0 62 if n1 >= b0 and n1 <= b9 then n1 = n1 - b0
jbe@0 63 elseif n1 >= bA and n1 <= bF then n1 = n1 - bA + 10
jbe@0 64 elseif n1 >= ba and n1 <= bf then n1 = n1 - ba + 10
jbe@0 65 else error("Assertion failed") end
jbe@0 66 if n2 >= b0 and n2 <= b9 then n2 = n2 - b0
jbe@0 67 elseif n2 >= bA and n2 <= bF then n2 = n2 - bA + 10
jbe@0 68 elseif n2 >= ba and n2 <= bf then n2 = n2 - ba + 10
jbe@0 69 else error("Assertion failed") end
jbe@0 70 return string.char(n1 * 16 + n2)
jbe@0 71 end
jbe@0 72 )
jbe@0 73 )
jbe@0 74 end
jbe@0 75 end
jbe@0 76
jbe@0 77 -- status codes that carry no response body (in addition to 1xx):
jbe@0 78 -- (set to "zero_content_length" if Content-Length header is required)
jbe@0 79 status_without_response_body = {
jbe@5 80 ["101"] = true, -- list 101 to allow protocol switch
jbe@0 81 ["204"] = true,
jbe@0 82 ["205"] = "zero_content_length",
jbe@0 83 ["304"] = true
jbe@0 84 }
jbe@0 85
jbe@0 86 -- handling of GET/POST param tables:
jbe@0 87 local new_params_list -- defined later
jbe@0 88 do
jbe@0 89 local params_list_mapping = setmetatable({}, {__mode="k"})
jbe@35 90 local function nextnonempty(tbl, key)
jbe@35 91 while true do
jbe@35 92 key = next(tbl, key)
jbe@35 93 if key == nil then
jbe@35 94 return nil
jbe@35 95 end
jbe@35 96 local value = tbl[key]
jbe@35 97 if #value > 0 then
jbe@35 98 return key, value
jbe@35 99 end
jbe@35 100 end
jbe@35 101 end
jbe@35 102 local function nextvalue(tbl, key)
jbe@35 103 key = next(tbl, key)
jbe@35 104 if key == nil then
jbe@35 105 return nil
jbe@35 106 end
jbe@35 107 return key, tbl[key][1]
jbe@35 108 end
jbe@0 109 local params_list_metatable = {
jbe@0 110 __index = function(self, key)
jbe@0 111 local tbl = {}
jbe@0 112 self[key] = tbl
jbe@0 113 return tbl
jbe@35 114 end,
jbe@35 115 __pairs = function(self)
jbe@35 116 return nextnonempty, self, nil
jbe@0 117 end
jbe@0 118 }
jbe@0 119 local params_metatable = {
jbe@0 120 __index = function(self, key)
jbe@36 121 return params_list_mapping[self][key][1]
jbe@36 122 end,
jbe@36 123 __newindex = function(self, key, value)
jbe@36 124 params_list_mapping[self][key] = {value}
jbe@35 125 end,
jbe@35 126 __pairs = function(self)
jbe@35 127 return nextvalue, params_list_mapping[self], nil
jbe@0 128 end
jbe@0 129 }
jbe@0 130 -- returns a table to store key value-list pairs (i.e. multiple values),
jbe@0 131 -- and a second table automatically mapping keys to the first value
jbe@0 132 -- using the key value-list pairs in the first table:
jbe@0 133 new_params_list = function()
jbe@0 134 local params_list = setmetatable({}, params_list_metatable)
jbe@0 135 local params = setmetatable({}, params_metatable)
jbe@0 136 params_list_mapping[params] = params_list
jbe@0 137 return params_list, params
jbe@0 138 end
jbe@0 139 end
jbe@0 140 -- parses URL encoded form data and stores it in
jbe@0 141 -- a key value-list pairs structure that has to be
jbe@0 142 -- previously obtained by calling by new_params_list():
jbe@0 143 local function read_urlencoded_form(tbl, data)
jbe@12 144 for rawkey, rawvalue in string.gmatch(data, "([^?=&]*)=([^?=&]*)") do
jbe@0 145 local subtbl = tbl[decode_uri(rawkey)]
jbe@0 146 subtbl[#subtbl+1] = decode_uri(rawvalue)
jbe@0 147 end
jbe@0 148 end
jbe@0 149
jbe@0 150 -- function creating a HTTP handler:
jbe@0 151 function generate_handler(handler, options)
jbe@0 152 -- swap arguments if necessary (for convenience):
jbe@0 153 if type(handler) ~= "function" and type(options) == "function" then
jbe@0 154 handler, options = options, handler
jbe@0 155 end
jbe@0 156 -- process options:
jbe@0 157 options = options or {}
jbe@0 158 local preamble = "" -- preamble sent with every(!) HTTP response
jbe@0 159 do
jbe@0 160 -- named arg "static_headers" is used to create the preamble:
jbe@0 161 local s = options.static_headers
jbe@0 162 local t = {}
jbe@0 163 if s then
jbe@0 164 if type(s) == "string" then
jbe@0 165 for line in string.gmatch(s, "[^\r\n]+") do
jbe@0 166 t[#t+1] = line
jbe@0 167 end
jbe@0 168 else
jbe@0 169 for i, kv in ipairs(options.static_headers) do
jbe@0 170 if type(kv) == "string" then
jbe@0 171 t[#t+1] = kv
jbe@0 172 else
jbe@0 173 t[#t+1] = kv[1] .. ": " .. kv[2]
jbe@0 174 end
jbe@0 175 end
jbe@0 176 end
jbe@0 177 end
jbe@0 178 t[#t+1] = ""
jbe@0 179 preamble = table.concat(t, "\r\n")
jbe@0 180 end
jbe@44 181 local input_chunk_size = options.maximum_input_chunk_size or options.chunk_size or 16384
jbe@44 182 local output_chunk_size = options.minimum_output_chunk_size or options.chunk_size or 1024
jbe@54 183 local request_header_timeout, response_timeout
jbe@54 184 if options.request_header_timeout ~= nil then
jbe@54 185 request_header_timeout = options.request_header_timeout
jbe@54 186 elseif options.timeout ~= nil then
jbe@54 187 request_header_timeout = options.timeout or 0
jbe@54 188 else
jbe@54 189 request_header_timeout = 360
jbe@53 190 end
jbe@54 191 if options.timeout ~= nil then
jbe@54 192 response_timeout = options.timeout or 0
jbe@54 193 else
jbe@54 194 response_timeout = 1800
jbe@53 195 end
jbe@0 196 -- return connect handler:
jbe@0 197 return function(socket)
jbe@0 198 local survive = true -- set to false if process shall be terminated later
jbe@31 199 repeat
jbe@54 200 -- (re)set timeout:
jbe@54 201 timeout(request_header_timeout or 0)
jbe@0 202 -- process named arguments "request_header_size_limit" and "request_body_size_limit":
jbe@0 203 local remaining_header_size_limit = options.request_header_size_limit or 1024*1024
jbe@0 204 local remaining_body_size_limit = options.request_body_size_limit or 64*1024*1024
jbe@0 205 -- state variables for request handling:
jbe@0 206 local output_state = "no_status_sent" -- one of:
jbe@0 207 -- "no_status_sent" (initial state)
jbe@0 208 -- "info_status_sent" (1xx status code has been sent)
jbe@0 209 -- "bodyless_status_sent" (204/304 status code has been sent)
jbe@0 210 -- "status_sent" (regular status code has been sent)
jbe@0 211 -- "headers_sent" (headers have been terminated)
jbe@0 212 -- "finished" (request has been answered completely)
jbe@0 213 local content_length -- value of Content-Length header sent
jbe@0 214 local bytes_sent = 0 -- number of bytes sent if Content-Length is set
jbe@0 215 local chunk_parts = {} -- list of chunks to send
jbe@0 216 local chunk_bytes = 0 -- sum of lengths of chunks to send
jbe@0 217 local connection_close_requested = false
jbe@0 218 local connection_close_responded = false
jbe@0 219 local headers_value_nil = {} -- header values that are nil
jbe@0 220 local request_body_content_length -- Content-Length of request body
jbe@0 221 local input_state = "pending" -- one of:
jbe@37 222 -- "pending" (request body has not been processed yet)
jbe@37 223 -- "deferred" (request body processing is deferred)
jbe@37 224 -- "inprogress" (request body is currently being read)
jbe@37 225 -- "finished" (request body has been read)
jbe@0 226 local streamed_post_params = {} -- mapping from POST field name to stream function
jbe@0 227 local streamed_post_param_patterns = {} -- list of POST field pattern and stream function pairs
jbe@0 228 -- object passed to handler (with methods, GET/POST params, etc.):
jbe@0 229 local request
jbe@50 230 -- handling I/O errors (including protocol violations):
jbe@50 231 local socket_closed = false
jbe@50 232 local function assert_output(retval, errmsg)
jbe@50 233 if retval then
jbe@50 234 return retval
jbe@50 235 end
jbe@50 236 request.faulty = true
jbe@50 237 errmsg = "Could not send data to client: " .. errmsg
jbe@50 238 io.stderr:write(errmsg, "\n")
jbe@50 239 if not socket_closed then
jbe@50 240 socket_closed = true
jbe@50 241 socket:cancel()
jbe@50 242 end
jbe@50 243 error("Could not send data to client: " .. errmsg)
jbe@50 244 end
jbe@50 245 local function request_error(throw_error, status, text)
jbe@50 246 local errmsg = "Error while reading request from client. Error response: " .. status
jbe@50 247 if text then
jbe@50 248 errmsg = errmsg .. " (" .. text .. ")"
jbe@50 249 end
jbe@50 250 io.stderr:write(errmsg, "\n") -- needs to be written now, because of possible timeout error later
jbe@50 251 if
jbe@50 252 output_state == "no_status_sent" or
jbe@50 253 output_state == "info_status_sent"
jbe@50 254 then
jbe@50 255 local error_response_status, errmsg2 = pcall(function()
jbe@50 256 request:defer_reading() -- don't read request body (because of possibly invalid state)
jbe@50 257 request:send_status(status)
jbe@50 258 request:send_header("Content-Type", "text/plain")
jbe@50 259 request:send_header("Connection", "close")
jbe@50 260 request:send_data(status, "\n")
jbe@50 261 if text then
jbe@50 262 request:send_data("\n", text, "\n")
jbe@50 263 end
jbe@50 264 request:finish()
jbe@50 265 end)
jbe@50 266 if not error_response_status and not request.faulty then
jbe@50 267 request.faulty = true
jbe@50 268 error("Unexpected error while sending error response: " .. errmsg2)
jbe@50 269 end
jbe@51 270 else
jbe@51 271 if not socket_closed then
jbe@51 272 socket_closed = true
jbe@51 273 socket:cancel()
jbe@51 274 end
jbe@50 275 end
jbe@50 276 if throw_error then
jbe@50 277 request.faulty = true
jbe@50 278 error(errmsg)
jbe@50 279 else
jbe@50 280 return survive
jbe@50 281 end
jbe@50 282 end
jbe@50 283 local function assert_not_faulty()
jbe@50 284 assert(not request.faulty, "Tried to use faulty request handle")
jbe@50 285 end
jbe@0 286 -- reads a number of bytes from the socket,
jbe@0 287 -- optionally feeding these bytes chunk-wise
jbe@0 288 -- into a callback function:
jbe@0 289 local function read_body_bytes(remaining, callback)
jbe@0 290 while remaining > 0 do
jbe@0 291 local limit
jbe@0 292 if remaining > input_chunk_size then
jbe@0 293 limit = input_chunk_size
jbe@0 294 else
jbe@0 295 limit = remaining
jbe@0 296 end
jbe@0 297 local chunk = socket:read(limit)
jbe@0 298 if not chunk or #chunk ~= limit then
jbe@50 299 request_error(true, "400 Bad Request", "Unexpected EOF or read error while reading chunk of request body")
jbe@0 300 end
jbe@0 301 remaining = remaining - limit
jbe@0 302 if callback then
jbe@0 303 callback(chunk)
jbe@0 304 end
jbe@0 305 end
jbe@0 306 end
jbe@0 307 -- flushes or closes the socket (depending on
jbe@0 308 -- whether "Connection: close" header was sent):
jbe@0 309 local function finish_response()
jbe@0 310 if connection_close_responded then
jbe@0 311 -- close output stream:
jbe@50 312 assert_output(socket.output:close())
jbe@0 313 -- wait for EOF of peer to avoid immediate TCP RST condition:
jbe@0 314 timeout(2, function()
jbe@0 315 while socket.input:read(input_chunk_size) do end
jbe@0 316 end)
jbe@0 317 -- fully close socket:
jbe@45 318 socket_closed = true -- avoid double close on error
jbe@50 319 assert_output(socket:close())
jbe@0 320 else
jbe@50 321 assert_output(socket:flush())
jbe@0 322 request:stream_request_body()
jbe@0 323 end
jbe@0 324 end
jbe@0 325 -- writes out buffered chunks (without flushing the socket):
jbe@0 326 local function send_chunk()
jbe@0 327 if chunk_bytes > 0 then
jbe@50 328 assert_output(socket:write(string.format("%x\r\n", chunk_bytes)))
jbe@0 329 for i = 1, #chunk_parts do
jbe@50 330 assert_output(socket:write(chunk_parts[i]))
jbe@0 331 end
jbe@0 332 chunk_parts = {}
jbe@0 333 chunk_bytes = 0
jbe@50 334 assert_output(socket:write("\r\n"))
jbe@0 335 end
jbe@0 336 end
jbe@0 337 -- terminate header section in response, optionally flushing:
jbe@0 338 -- (may be called multiple times unless response is finished)
jbe@0 339 local function finish_headers(flush)
jbe@0 340 if output_state == "no_status_sent" then
jbe@0 341 error("HTTP status has not been sent yet")
jbe@0 342 elseif output_state == "finished" then
jbe@0 343 error("Response has already been finished")
jbe@0 344 elseif output_state == "info_status_sent" then
jbe@50 345 assert_output(socket:write("\r\n"))
jbe@50 346 assert_output(socket:flush())
jbe@0 347 output_state = "no_status_sent"
jbe@0 348 elseif output_state == "bodyless_status_sent" then
jbe@0 349 if connection_close_requested and not connection_close_responded then
jbe@0 350 request:send_header("Connection", "close")
jbe@0 351 end
jbe@50 352 assert_output(socket:write("\r\n"))
jbe@0 353 finish_response()
jbe@0 354 output_state = "finished"
jbe@0 355 elseif output_state == "status_sent" then
jbe@0 356 if not content_length then
jbe@50 357 assert_output(socket:write("Transfer-Encoding: chunked\r\n"))
jbe@0 358 end
jbe@0 359 if connection_close_requested and not connection_close_responded then
jbe@0 360 request:send_header("Connection", "close")
jbe@0 361 end
jbe@50 362 assert_output(socket:write("\r\n"))
jbe@0 363 if request.method == "HEAD" then
jbe@0 364 finish_response()
jbe@0 365 elseif flush then
jbe@50 366 assert_output(socket:flush())
jbe@0 367 end
jbe@0 368 output_state = "headers_sent"
jbe@0 369 elseif output_state ~= "headers_sent" then
jbe@0 370 error("Unexpected internal status in HTTP engine")
jbe@0 371 end
jbe@0 372 end
jbe@0 373 -- create request object and set several functions and values:
jbe@0 374 request = {
jbe@50 375 -- error state:
jbe@50 376 faulty = false,
jbe@0 377 -- allow raw socket access:
jbe@0 378 socket = socket,
jbe@0 379 -- parsed cookies:
jbe@0 380 cookies = {},
jbe@0 381 -- send a HTTP response status (e.g. "200 OK"):
jbe@0 382 send_status = function(self, value)
jbe@50 383 assert_not_faulty()
jbe@0 384 if input_state == "pending" then
jbe@0 385 request:process_request_body()
jbe@0 386 end
jbe@0 387 if output_state == "info_status_sent" then
jbe@50 388 assert_output(socket:write("\r\n"))
jbe@50 389 assert_output(socket:flush())
jbe@0 390 elseif output_state ~= "no_status_sent" then
jbe@0 391 error("HTTP status has already been sent")
jbe@0 392 end
jbe@0 393 local status1 = string.sub(value, 1, 1)
jbe@0 394 local status3 = string.sub(value, 1, 3)
jbe@50 395 assert_output(socket:write("HTTP/1.1 ", value, "\r\n", preamble))
jbe@0 396 local without_response_body = status_without_response_body[status3]
jbe@0 397 if without_response_body then
jbe@0 398 output_state = "bodyless_status_sent"
jbe@0 399 if without_response_body == "zero_content_length" then
jbe@0 400 request:send_header("Content-Length", 0)
jbe@0 401 end
jbe@0 402 elseif status1 == "1" then
jbe@0 403 output_state = "info_status_sent"
jbe@0 404 else
jbe@0 405 output_state = "status_sent"
jbe@0 406 end
jbe@0 407 end,
jbe@0 408 -- send a HTTP response header
jbe@0 409 -- (key and value as separate args):
jbe@0 410 send_header = function(self, key, value)
jbe@50 411 assert_not_faulty()
jbe@0 412 if output_state == "no_status_sent" then
jbe@0 413 error("HTTP status has not been sent yet")
jbe@0 414 elseif
jbe@0 415 output_state ~= "info_status_sent" and
jbe@0 416 output_state ~= "bodyless_status_sent" and
jbe@0 417 output_state ~= "status_sent"
jbe@0 418 then
jbe@0 419 error("All HTTP headers have already been sent")
jbe@0 420 end
jbe@0 421 local key_lower = string.lower(key)
jbe@0 422 if key_lower == "content-length" then
jbe@0 423 if output_state == "info_status_sent" then
jbe@0 424 error("Cannot set Content-Length for informational status response")
jbe@0 425 end
jbe@0 426 local new_content_length = assert(tonumber(value), "Invalid content-length")
jbe@0 427 if content_length == nil then
jbe@0 428 content_length = new_content_length
jbe@0 429 elseif content_length == new_content_length then
jbe@0 430 return
jbe@0 431 else
jbe@0 432 error("Content-Length has been set multiple times with different values")
jbe@0 433 end
jbe@0 434 elseif key_lower == "connection" then
jbe@0 435 for entry in string.gmatch(string.lower(value), "[^,]+") do
jbe@0 436 if string.match(entry, "^[ \t]*close[ \t]*$") then
jbe@0 437 if output_state == "info_status_sent" then
jbe@0 438 error("Cannot set \"Connection: close\" for informational status response")
jbe@0 439 end
jbe@0 440 if connection_close_responded then
jbe@0 441 return
jbe@0 442 else
jbe@0 443 connection_close_responded = true
jbe@0 444 break
jbe@0 445 end
jbe@0 446 end
jbe@0 447 end
jbe@0 448 end
jbe@50 449 assert_output(socket:write(key, ": ", value, "\r\n"))
jbe@0 450 end,
jbe@0 451 -- method to finish and flush headers:
jbe@0 452 finish_headers = function()
jbe@50 453 assert_not_faulty()
jbe@0 454 finish_headers(true)
jbe@0 455 end,
jbe@0 456 -- send data for response body:
jbe@0 457 send_data = function(self, ...)
jbe@50 458 assert_not_faulty()
jbe@0 459 if output_state == "info_status_sent" then
jbe@0 460 error("No (non-informational) HTTP status has been sent yet")
jbe@0 461 elseif output_state == "bodyless_status_sent" then
jbe@0 462 error("Cannot send response data for body-less status message")
jbe@0 463 end
jbe@0 464 finish_headers(false)
jbe@0 465 if output_state ~= "headers_sent" then
jbe@0 466 error("Unexpected internal status in HTTP engine")
jbe@0 467 end
jbe@0 468 if request.method == "HEAD" then
jbe@0 469 return
jbe@0 470 end
jbe@0 471 for i = 1, select("#", ...) do
jbe@0 472 local str = tostring(select(i, ...))
jbe@0 473 if #str > 0 then
jbe@0 474 if content_length then
jbe@0 475 local bytes_to_send = #str
jbe@0 476 if bytes_sent + bytes_to_send > content_length then
jbe@50 477 assert_output(socket:write(string.sub(str, 1, content_length - bytes_sent)))
jbe@0 478 bytes_sent = content_length
jbe@0 479 error("Content length exceeded")
jbe@0 480 else
jbe@50 481 assert_output(socket:write(str))
jbe@0 482 bytes_sent = bytes_sent + bytes_to_send
jbe@0 483 end
jbe@0 484 else
jbe@0 485 chunk_bytes = chunk_bytes + #str
jbe@0 486 chunk_parts[#chunk_parts+1] = str
jbe@0 487 end
jbe@0 488 end
jbe@0 489 end
jbe@0 490 if chunk_bytes >= output_chunk_size then
jbe@0 491 send_chunk()
jbe@0 492 end
jbe@0 493 end,
jbe@0 494 -- flush output buffer:
jbe@0 495 flush = function(self)
jbe@50 496 assert_not_faulty()
jbe@0 497 send_chunk()
jbe@50 498 assert_output(socket:flush())
jbe@0 499 end,
jbe@0 500 -- finish response:
jbe@0 501 finish = function(self)
jbe@50 502 assert_not_faulty()
jbe@0 503 if output_state == "finished" then
jbe@0 504 return
jbe@0 505 elseif output_state == "info_status_sent" then
jbe@0 506 error("Informational HTTP response can be finished with :finish_headers() method")
jbe@0 507 end
jbe@0 508 finish_headers(false)
jbe@0 509 if output_state == "headers_sent" then
jbe@0 510 if request.method ~= "HEAD" then
jbe@0 511 if content_length then
jbe@0 512 if bytes_sent ~= content_length then
jbe@0 513 error("Content length not used")
jbe@0 514 end
jbe@0 515 else
jbe@0 516 send_chunk()
jbe@50 517 assert_output(socket:write("0\r\n\r\n"))
jbe@0 518 end
jbe@0 519 finish_response()
jbe@0 520 end
jbe@0 521 output_state = "finished"
jbe@28 522 elseif output_state ~= "finished" then
jbe@0 523 error("Unexpected internal status in HTTP engine")
jbe@0 524 end
jbe@0 525 end,
jbe@0 526 -- table mapping header field names to value-lists
jbe@0 527 -- (raw access):
jbe@0 528 headers = setmetatable({}, {
jbe@0 529 __index = function(self, key)
jbe@0 530 local lowerkey = string.lower(key)
jbe@0 531 if lowerkey == key then
jbe@0 532 return
jbe@0 533 end
jbe@0 534 local result = rawget(self, lowerkey)
jbe@0 535 if result == nil then
jbe@0 536 result = {}
jbe@0 537 end
jbe@0 538 self[lowerkey] = result
jbe@0 539 self[key] = result
jbe@0 540 return result
jbe@0 541 end
jbe@0 542 }),
jbe@0 543 -- table mapping header field names to value-lists
jbe@0 544 -- (for headers with comma separated values):
jbe@0 545 headers_csv_table = setmetatable({}, {
jbe@0 546 __index = function(self, key)
jbe@0 547 local result = {}
jbe@0 548 for i, line in ipairs(request.headers[key]) do
jbe@0 549 for entry in string.gmatch(line, "[^,]+") do
jbe@0 550 local value = string.match(entry, "^[ \t]*(..-)[ \t]*$")
jbe@0 551 if value then
jbe@0 552 result[#result+1] = value
jbe@0 553 end
jbe@0 554 end
jbe@0 555 end
jbe@0 556 self[key] = result
jbe@0 557 return result
jbe@0 558 end
jbe@0 559 }),
jbe@0 560 -- table mapping header field names to a comma separated string
jbe@0 561 -- (for headers with comma separated values):
jbe@0 562 headers_csv_string = setmetatable({}, {
jbe@0 563 __index = function(self, key)
jbe@0 564 local result = {}
jbe@0 565 for i, line in ipairs(request.headers[key]) do
jbe@0 566 result[#result+1] = line
jbe@0 567 end
jbe@0 568 result = string.concat(result, ", ")
jbe@0 569 self[key] = result
jbe@0 570 return result
jbe@0 571 end
jbe@0 572 }),
jbe@0 573 -- table mapping header field names to a single string value
jbe@0 574 -- (or false if header has been sent multiple times):
jbe@0 575 headers_value = setmetatable({}, {
jbe@0 576 __index = function(self, key)
jbe@0 577 if headers_value_nil[key] then
jbe@0 578 return nil
jbe@0 579 end
jbe@0 580 local result = nil
jbe@0 581 local values = request.headers_csv_table[key]
jbe@0 582 if #values == 0 then
jbe@0 583 headers_value_nil[key] = true
jbe@0 584 elseif #values == 1 then
jbe@0 585 result = values[1]
jbe@0 586 else
jbe@0 587 result = false
jbe@0 588 end
jbe@0 589 self[key] = result
jbe@0 590 return result
jbe@0 591 end
jbe@0 592 }),
jbe@0 593 -- table mapping header field names to a flag table,
jbe@0 594 -- indicating if the comma separated value contains certain entries:
jbe@0 595 headers_flags = setmetatable({}, {
jbe@0 596 __index = function(self, key)
jbe@0 597 local result = setmetatable({}, {
jbe@0 598 __index = function(self, key)
jbe@0 599 local lowerkey = string.lower(key)
jbe@0 600 local result = rawget(self, lowerkey) or false
jbe@0 601 self[lowerkey] = result
jbe@0 602 self[key] = result
jbe@0 603 return result
jbe@0 604 end
jbe@0 605 })
jbe@0 606 for i, value in ipairs(request.headers_csv_table[key]) do
jbe@0 607 result[string.lower(value)] = true
jbe@0 608 end
jbe@0 609 self[key] = result
jbe@0 610 return result
jbe@0 611 end
jbe@0 612 }),
jbe@0 613 -- register POST param stream handler for a single field name:
jbe@0 614 stream_post_param = function(self, field_name, callback)
jbe@50 615 assert_not_faulty()
jbe@0 616 if input_state == "inprogress" or input_state == "finished" then
jbe@0 617 error("Cannot register POST param streaming function if request body is already processed")
jbe@0 618 end
jbe@0 619 streamed_post_params[field_name] = callback
jbe@0 620 end,
jbe@0 621 -- register POST param stream handler for a field name pattern:
jbe@0 622 stream_post_params = function(self, pattern, callback)
jbe@50 623 assert_not_faulty()
jbe@0 624 if input_state == "inprogress" or input_state == "finished" then
jbe@0 625 error("Cannot register POST param streaming function if request body is already processed")
jbe@0 626 end
jbe@0 627 streamed_post_param_patterns[#streamed_post_param_patterns+1] = {pattern, callback}
jbe@0 628 end,
jbe@0 629 -- disables automatic request body processing on write
jbe@0 630 -- (use with caution):
jbe@0 631 defer_reading = function(self)
jbe@50 632 assert_not_faulty()
jbe@0 633 if input_state == "pending" then
jbe@0 634 input_state = "deferred"
jbe@0 635 end
jbe@0 636 end,
jbe@0 637 -- processes the request body and sets the request.post_params,
jbe@0 638 -- request.post_params_list, request.meta_post_params, and
jbe@0 639 -- request.meta_post_params_list values (can be called manually or
jbe@0 640 -- automatically if post_params are accessed or data is written out)
jbe@0 641 process_request_body = function(self)
jbe@50 642 assert_not_faulty()
jbe@0 643 if input_state == "finished" then
jbe@0 644 return
jbe@0 645 end
jbe@0 646 local post_params_list, post_params = new_params_list()
jbe@0 647 local content_type = request.headers_value["Content-Type"]
jbe@0 648 if content_type then
jbe@0 649 if
jbe@0 650 content_type == "application/x-www-form-urlencoded" or
jbe@0 651 string.match(content_type, "^application/x%-www%-form%-urlencoded *;")
jbe@0 652 then
jbe@0 653 read_urlencoded_form(post_params_list, request.body)
jbe@0 654 else
jbe@0 655 local boundary = string.match(
jbe@0 656 content_type,
jbe@0 657 '^multipart/form%-data[ \t]*[;,][ \t]*boundary="([^"]+)"$'
jbe@0 658 ) or string.match(
jbe@0 659 content_type,
jbe@0 660 '^multipart/form%-data[ \t]*[;,][ \t]*boundary=([^"; \t]+)$'
jbe@0 661 )
jbe@0 662 if boundary then
jbe@0 663 local post_metadata_list, post_metadata = new_params_list()
jbe@0 664 boundary = "--" .. boundary
jbe@0 665 local headerdata = ""
jbe@0 666 local streamer
jbe@0 667 local field_name
jbe@0 668 local metadata = {}
jbe@0 669 local value_parts
jbe@0 670 local function default_streamer(chunk)
jbe@0 671 value_parts[#value_parts+1] = chunk
jbe@0 672 end
jbe@0 673 local function stream_part_finish()
jbe@0 674 if streamer == default_streamer then
jbe@0 675 local value = table.concat(value_parts)
jbe@0 676 value_parts = nil
jbe@0 677 if field_name then
jbe@0 678 local values = post_params_list[field_name]
jbe@0 679 values[#values+1] = value
jbe@0 680 local metadata_entries = post_metadata_list[field_name]
jbe@0 681 metadata_entries[#metadata_entries+1] = metadata
jbe@0 682 end
jbe@0 683 else
jbe@0 684 streamer()
jbe@0 685 end
jbe@0 686 headerdata = ""
jbe@0 687 streamer = nil
jbe@0 688 field_name = nil
jbe@0 689 metadata = {}
jbe@0 690 end
jbe@0 691 local function stream_part_chunk(chunk)
jbe@0 692 if streamer then
jbe@0 693 streamer(chunk)
jbe@0 694 else
jbe@0 695 headerdata = headerdata .. chunk
jbe@0 696 while true do
jbe@0 697 local line, remaining = string.match(headerdata, "^(.-)\r?\n(.*)$")
jbe@0 698 if not line then
jbe@0 699 break
jbe@0 700 end
jbe@0 701 if line == "" then
jbe@0 702 streamer = streamed_post_params[field_name]
jbe@0 703 if not streamer then
jbe@0 704 for i, rule in ipairs(streamed_post_param_patterns) do
jbe@0 705 if string.match(field_name, rule[1]) then
jbe@0 706 streamer = rule[2]
jbe@0 707 break
jbe@0 708 end
jbe@0 709 end
jbe@0 710 end
jbe@0 711 if not streamer then
jbe@0 712 value_parts = {}
jbe@0 713 streamer = default_streamer
jbe@0 714 end
jbe@0 715 streamer(remaining, field_name, metadata)
jbe@0 716 return
jbe@0 717 end
jbe@0 718 headerdata = remaining
jbe@0 719 local header_key, header_value = string.match(line, "^([^:]*):[ \t]*(.-)[ \t]*$")
jbe@0 720 if not header_key then
jbe@50 721 request_error(true, "400 Bad Request", "Invalid header in multipart/form-data part")
jbe@0 722 end
jbe@0 723 header_key = string.lower(header_key)
jbe@0 724 if header_key == "content-disposition" then
jbe@0 725 local escaped_header_value = string.gsub(header_value, '"[^"]*"', function(str)
jbe@0 726 return string.gsub(str, "=", "==")
jbe@0 727 end)
jbe@0 728 field_name = string.match(escaped_header_value, ';[ \t]*name="([^"]*)"')
jbe@0 729 if field_name then
jbe@0 730 field_name = string.gsub(field_name, "==", "=")
jbe@0 731 else
jbe@0 732 field_name = string.match(header_value, ';[ \t]*name=([^"; \t]+)')
jbe@0 733 end
jbe@0 734 metadata.file_name = string.match(escaped_header_value, ';[ \t]*filename="([^"]*)"')
jbe@0 735 if metadata.file_name then
jbe@0 736 metadata.file_name = string.gsub(metadata.file_name, "==", "=")
jbe@0 737 else
jbe@0 738 string.match(header_value, ';[ \t]*filename=([^"; \t]+)')
jbe@0 739 end
jbe@0 740 elseif header_key == "content-type" then
jbe@0 741 metadata.content_type = header_value
jbe@0 742 elseif header_key == "content-transfer-encoding" then
jbe@50 743 request_error(true, "400 Bad Request", "Content-transfer-encoding not supported by multipart/form-data parser")
jbe@0 744 end
jbe@0 745 end
jbe@0 746 end
jbe@0 747 end
jbe@0 748 local skippart = true -- ignore data until first boundary
jbe@0 749 local afterbound = false -- interpret 2 bytes after boundary ("\r\n" or "--")
jbe@0 750 local terminated = false -- final boundary read
jbe@0 751 local bigchunk = ""
jbe@0 752 request:stream_request_body(function(chunk)
jbe@0 753 if terminated then
jbe@0 754 return
jbe@0 755 end
jbe@0 756 bigchunk = bigchunk .. chunk
jbe@0 757 while true do
jbe@0 758 if afterbound then
jbe@0 759 if #bigchunk <= 2 then
jbe@0 760 return
jbe@0 761 end
jbe@0 762 local terminator = string.sub(bigchunk, 1, 2)
jbe@0 763 if terminator == "\r\n" then
jbe@0 764 afterbound = false
jbe@0 765 bigchunk = string.sub(bigchunk, 3)
jbe@0 766 elseif terminator == "--" then
jbe@0 767 terminated = true
jbe@0 768 bigchunk = nil
jbe@0 769 return
jbe@0 770 else
jbe@50 771 request_error(true, "400 Bad Request", "Error while parsing multipart body (expected CRLF or double minus)")
jbe@0 772 end
jbe@0 773 end
jbe@0 774 local pos1, pos2 = string.find(bigchunk, boundary, 1, true)
jbe@0 775 if not pos1 then
jbe@0 776 if not skippart then
jbe@0 777 local safe = #bigchunk-#boundary
jbe@0 778 if safe > 0 then
jbe@0 779 stream_part_chunk(string.sub(bigchunk, 1, safe))
jbe@0 780 bigchunk = string.sub(bigchunk, safe+1)
jbe@0 781 end
jbe@0 782 end
jbe@0 783 return
jbe@0 784 end
jbe@0 785 if not skippart then
jbe@0 786 stream_part_chunk(string.sub(bigchunk, 1, pos1 - 1))
jbe@0 787 stream_part_finish()
jbe@0 788 else
jbe@0 789 boundary = "\r\n" .. boundary
jbe@0 790 skippart = false
jbe@0 791 end
jbe@0 792 bigchunk = string.sub(bigchunk, pos2 + 1)
jbe@0 793 afterbound = true
jbe@0 794 end
jbe@0 795 end)
jbe@0 796 if not terminated then
jbe@50 797 request_error(true, "400 Bad Request", "Premature end of multipart/form-data request body")
jbe@0 798 end
jbe@0 799 request.post_metadata_list, request.post_metadata = post_metadata_list, post_metadata
jbe@0 800 else
jbe@50 801 request_error(true, "415 Unsupported Media Type", "Unknown Content-Type of request body")
jbe@0 802 end
jbe@0 803 end
jbe@0 804 end
jbe@0 805 request.post_params_list, request.post_params = post_params_list, post_params
jbe@0 806 end,
jbe@0 807 -- stream request body to an (optional) callback function
jbe@0 808 -- without processing it otherwise:
jbe@0 809 stream_request_body = function(self, callback)
jbe@50 810 assert_not_faulty()
jbe@0 811 if input_state ~= "pending" and input_state ~= "deferred" then
jbe@0 812 if callback then
jbe@0 813 if input_state == "inprogress" then
jbe@48 814 error("Request body is currently being processed")
jbe@0 815 else
jbe@0 816 error("Request body has already been processed")
jbe@0 817 end
jbe@0 818 end
jbe@0 819 return
jbe@0 820 end
jbe@0 821 input_state = "inprogress"
jbe@0 822 if request.headers_flags["Expect"]["100-continue"] then
jbe@0 823 request:send_status("100 Continue")
jbe@0 824 request:finish_headers()
jbe@0 825 end
jbe@0 826 if request.headers_flags["Transfer-Encoding"]["chunked"] then
jbe@0 827 while true do
jbe@0 828 local line = socket:readuntil("\n", 32 + remaining_body_size_limit)
jbe@46 829 if not line then
jbe@50 830 request_error(true, "400 Bad Request", "Unexpected EOF while reading next chunk of request body")
jbe@0 831 end
jbe@0 832 local zeros, lenstr = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)\r?\n$")
jbe@0 833 local chunkext
jbe@0 834 if lenstr then
jbe@0 835 chunkext = ""
jbe@0 836 else
jbe@0 837 zeros, lenstr, chunkext = string.match(line, "^(0*)([1-9A-Fa-f]+[0-9A-Fa-f]*)([ \t;].-)\r?\n$")
jbe@0 838 end
jbe@0 839 if not lenstr or #lenstr > 13 then
jbe@50 840 request_error(true, "400 Bad Request", "Encoding error or unexpected EOF or read error while reading chunk of request body")
jbe@0 841 end
jbe@0 842 local len = tonumber("0x" .. lenstr)
jbe@0 843 remaining_body_size_limit = remaining_body_size_limit - (#zeros + #chunkext + len)
jbe@0 844 if remaining_body_size_limit < 0 then
jbe@50 845 request_error(true, "413 Request Entity Too Large", "Request body size limit exceeded")
jbe@0 846 end
jbe@0 847 if len == 0 then break end
jbe@0 848 read_body_bytes(len, callback)
jbe@0 849 local term = socket:readuntil("\n", 2)
jbe@0 850 if term ~= "\r\n" and term ~= "\n" then
jbe@50 851 request_error(true, "400 Bad Request", "Encoding error while reading chunk of request body")
jbe@0 852 end
jbe@0 853 end
jbe@0 854 while true do
jbe@0 855 local line = socket:readuntil("\n", 2 + remaining_body_size_limit)
jbe@0 856 if line == "\r\n" or line == "\n" then break end
jbe@0 857 remaining_body_size_limit = remaining_body_size_limit - #line
jbe@0 858 if remaining_body_size_limit < 0 then
jbe@50 859 request_error(true, "413 Request Entity Too Large", "Request body size limit exceeded while reading trailer section of chunked request body")
jbe@0 860 end
jbe@0 861 end
jbe@0 862 elseif request_body_content_length then
jbe@0 863 read_body_bytes(request_body_content_length, callback)
jbe@0 864 end
jbe@0 865 input_state = "finished"
jbe@0 866 end
jbe@0 867 }
jbe@0 868 -- initialize tables for GET params in request object:
jbe@0 869 request.get_params_list, request.get_params = new_params_list()
jbe@0 870 -- add meta table to request object to allow access to "body" and POST params:
jbe@0 871 setmetatable(request, {
jbe@0 872 __index = function(self, key)
jbe@0 873 if key == "body" then
jbe@0 874 local chunks = {}
jbe@0 875 request:stream_request_body(function(chunk)
jbe@0 876 chunks[#chunks+1] = chunk
jbe@0 877 end)
jbe@0 878 self.body = table.concat(chunks)
jbe@0 879 return self.body
jbe@0 880 elseif
jbe@0 881 key == "post_params_list" or key == "post_params" or
jbe@0 882 key == "post_metadata_list" or key == "post_metadata"
jbe@0 883 then
jbe@0 884 request:process_request_body()
jbe@0 885 return request[key]
jbe@0 886 end
jbe@0 887 end
jbe@0 888 })
jbe@0 889 -- read and parse request line:
jbe@0 890 local line = socket:readuntil("\n", remaining_header_size_limit)
jbe@0 891 if not line then return survive end
jbe@0 892 remaining_header_size_limit = remaining_header_size_limit - #line
jbe@0 893 if remaining_header_size_limit == 0 then
jbe@50 894 return request_error(false, "414 Request-URI Too Long")
jbe@0 895 end
jbe@10 896 local target, proto
jbe@10 897 request.method, target, proto =
jbe@0 898 line:match("^([^ \t\r]+)[ \t]+([^ \t\r]+)[ \t]*([^ \t\r]*)[ \t]*\r?\n$")
jbe@0 899 if not request.method then
jbe@50 900 return request_error(false, "400 Bad Request")
jbe@0 901 elseif proto ~= "HTTP/1.1" then
jbe@50 902 return request_error(false, "505 HTTP Version Not Supported")
jbe@38 903 end
jbe@38 904 -- read and parse headers:
jbe@38 905 while true do
jbe@38 906 local line = socket:readuntil("\n", remaining_header_size_limit);
jbe@38 907 remaining_header_size_limit = remaining_header_size_limit - #line
jbe@38 908 if not line then
jbe@50 909 return request_error(false, "400 Bad Request")
jbe@38 910 end
jbe@38 911 if line == "\r\n" or line == "\n" then
jbe@38 912 break
jbe@38 913 end
jbe@38 914 if remaining_header_size_limit == 0 then
jbe@50 915 return request_error(false, "431 Request Header Fields Too Large")
jbe@38 916 end
jbe@38 917 local key, value = string.match(line, "^([^ \t\r]+):[ \t]*(.-)[ \t]*\r?\n$")
jbe@38 918 if not key then
jbe@50 919 return request_error(false, "400 Bad Request")
jbe@38 920 end
jbe@38 921 local values = request.headers[key]
jbe@38 922 values[#values+1] = value
jbe@38 923 end
jbe@38 924 -- process "Connection: close" header if existent:
jbe@38 925 connection_close_requested = request.headers_flags["Connection"]["close"]
jbe@38 926 -- process "Content-Length" header if existent:
jbe@38 927 do
jbe@38 928 local values = request.headers_csv_table["Content-Length"]
jbe@38 929 if #values > 0 then
jbe@38 930 request_body_content_length = tonumber(values[1])
jbe@38 931 local proper_value = tostring(request_body_content_length)
jbe@38 932 for i, value in ipairs(values) do
jbe@38 933 value = string.match(value, "^0*(.*)")
jbe@38 934 if value ~= proper_value then
jbe@50 935 return request_error(false, "400 Bad Request", "Content-Length header(s) invalid")
jbe@38 936 end
jbe@0 937 end
jbe@38 938 if request_body_content_length > remaining_body_size_limit then
jbe@50 939 return request_error(false, "413 Request Entity Too Large", "Announced request body size is too big")
jbe@0 940 end
jbe@0 941 end
jbe@38 942 end
jbe@38 943 -- process "Transfer-Encoding" header if existent:
jbe@38 944 do
jbe@38 945 local flag = request.headers_flags["Transfer-Encoding"]["chunked"]
jbe@38 946 local list = request.headers_csv_table["Transfer-Encoding"]
jbe@38 947 if (flag and #list ~= 1) or (not flag and #list ~= 0) then
jbe@50 948 return request_error(false, "400 Bad Request", "Unexpected Transfer-Encoding")
jbe@0 949 end
jbe@38 950 end
jbe@38 951 -- process "Expect" header if existent:
jbe@38 952 for i, value in ipairs(request.headers_csv_table["Expect"]) do
jbe@38 953 if string.lower(value) ~= "100-continue" then
jbe@50 954 return request_error(false, "417 Expectation Failed", "Unexpected Expect header")
jbe@10 955 end
jbe@38 956 end
jbe@38 957 -- get mandatory Host header according to RFC 7230:
jbe@38 958 request.host = request.headers_value["Host"]
jbe@38 959 if not request.host then
jbe@50 960 return request_error(false, "400 Bad Request", "No valid host header")
jbe@38 961 end
jbe@38 962 -- parse request target:
jbe@38 963 request.path, request.query = string.match(target, "^/([^?]*)(.*)$")
jbe@38 964 if not request.path then
jbe@38 965 local host2
jbe@38 966 host2, request.path, request.query = string.match(target, "^[Hh][Tt][Tt][Pp]://([^/?]+)/?([^?]*)(.*)$")
jbe@38 967 if host2 then
jbe@38 968 if request.host ~= host2 then
jbe@50 969 return request_error(false, "400 Bad Request", "No valid host header")
jbe@5 970 end
jbe@38 971 elseif not (target == "*" and request.method == "OPTIONS") then
jbe@50 972 return request_error(false, "400 Bad Request", "Invalid request target")
jbe@5 973 end
jbe@38 974 end
jbe@38 975 -- parse GET params:
jbe@38 976 if request.query then
jbe@38 977 read_urlencoded_form(request.get_params_list, request.query)
jbe@38 978 end
jbe@38 979 -- parse cookies:
jbe@38 980 for i, line in ipairs(request.headers["Cookie"]) do
jbe@38 981 for rawkey, rawvalue in
jbe@38 982 string.gmatch(line, "([^=; ]*)=([^=; ]*)")
jbe@38 983 do
jbe@38 984 request.cookies[decode_uri(rawkey)] = decode_uri(rawvalue)
jbe@5 985 end
jbe@0 986 end
jbe@54 987 -- (re)set timeout:
jbe@53 988 timeout(response_timeout or 0)
jbe@38 989 -- call underlying handler and remember boolean result:
jbe@38 990 if handler(request) ~= true then survive = false end
jbe@38 991 -- finish request (unless already done by underlying handler):
jbe@38 992 request:finish()
jbe@31 993 until connection_close_responded
jbe@0 994 return survive
jbe@0 995 end
jbe@0 996 end
jbe@0 997
jbe@0 998 return _M
jbe@0 999

Impressum / About Us