1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
|
-- original file : http.lua
-- for more into : see util-soc.lua
local tostring, tonumber, setmetatable, next, type = tostring, tonumber, setmetatable, next, type
local find, lower, format, gsub, match = string.find, string.lower, string.format, string.gsub, string.match
local concat = table.concat
local socket = socket or require("socket")
local url = socket.url or require("socket.url")
local ltn12 = ltn12 or require("ltn12")
local mime = mime or require("mime")
local headers = socket.headers or require("socket.headers")
local normalizeheaders = headers.normalize
local parseurl = url.parse
local buildurl = url.build
local absoluteurl = url.absolute
local unescapeurl = url.unescape
local skipsocket = socket.skip
local sinksocket = socket.sink
local sourcesocket = socket.source
local trysocket = socket.try
local tcpsocket = socket.tcp
local newtrysocket = socket.newtry
local protectsocket = socket.protect
local emptysource = ltn12.source.empty
local stringsource = ltn12.source.string
local rewindsource = ltn12.source.rewind
local pumpstep = ltn12.pump.step
local pumpall = ltn12.pump.all
local sinknull = ltn12.sink.null
local sinktable = ltn12.sink.table
local lowerheaders = headers.lower
local mimeb64 = mime.b64
-- todo: localize ltn12
local http = {
TIMEOUT = 60, -- connection timeout in seconds
USERAGENT = socket._VERSION, -- user agent field sent in request
}
socket.http = http
local PORT = 80
local SCHEMES = {
http = true,
}
-- Reads MIME headers from a connection, unfolding where needed
local function receiveheaders(sock, headers)
if not headers then
headers = { }
end
-- get first line
local line, err = sock:receive("*l") -- this seems to be wrong!
if err then
return nil, err
end
-- headers go until a blank line is found
while line ~= "" do
-- get field-name and value
local name, value = skipsocket(2, find(line, "^(.-):%s*(.*)"))
if not (name and value) then
return nil, "malformed reponse headers"
end
name = lower(name)
-- get next line (value might be folded)
line, err = sock:receive("*l")
if err then
return nil, err
end
-- unfold any folded values
while find(line, "^%s") do
value = value .. line
line = sock:receive("*l")
if err then
return nil, err
end
end
-- save pair in table
local found = headers[name]
if found then
value = found .. ", " .. value
end
headers[name] = value
end
return headers
end
-- Extra sources and sinks
socket.sourcet["http-chunked"] = function(sock, headers)
return setmetatable (
{
getfd = function() return sock:getfd() end,
dirty = function() return sock:dirty() end,
}, {
__call = function()
local line, err = sock:receive("*l")
if err then
return nil, err
end
local size = tonumber(gsub(line, ";.*", ""), 16)
if not size then
return nil, "invalid chunk size"
end
if size > 0 then
local chunk, err, part = sock:receive(size)
if chunk then
sock:receive("*a")
end
return chunk, err
else
headers, err = receiveheaders(sock, headers)
if not headers then
return nil, err
end
end
end
}
)
end
socket.sinkt["http-chunked"] = function(sock)
return setmetatable(
{
getfd = function() return sock:getfd() end,
dirty = function() return sock:dirty() end,
},
{
__call = function(self, chunk, err)
if not chunk then
chunk = ""
end
return sock:send(format("%X\r\n%s\r\n",#chunk,chunk))
end
})
end
-- Low level HTTP API
local methods = { }
local mt = { __index = methods }
local function openhttp(host, port, create)
local c = trysocket((create or tcpsocket)())
local h = setmetatable({ c = c }, mt)
local try = newtrysocket(function() h:close() end)
h.try = try
try(c:settimeout(http.TIMEOUT))
try(c:connect(host, port or PORT))
return h
end
http.open = openhttp
function methods.sendrequestline(self, method, uri)
local requestline = format("%s %s HTTP/1.1\r\n", method or "GET", uri)
return self.try(self.c:send(requestline))
end
function methods.sendheaders(self,headers)
self.try(self.c:send(normalizeheaders(headers)))
return 1
end
function methods.sendbody(self, headers, source, step)
if not source then
source = emptysource()
end
if not step then
step = pumpstep
end
local mode = "http-chunked"
if headers["content-length"] then
mode = "keep-open"
end
return self.try(pumpall(source, sinksocket(mode, self.c), step))
end
function methods.receivestatusline(self)
local try = self.try
local status = try(self.c:receive(5))
if status ~= "HTTP/" then
return nil, status -- HTTP/0.9
end
status = try(self.c:receive("*l", status))
local code = skipsocket(2, find(status, "HTTP/%d*%.%d* (%d%d%d)"))
return try(tonumber(code), status)
end
function methods.receiveheaders(self)
return self.try(receiveheaders(self.c))
end
function methods.receivebody(self, headers, sink, step)
if not sink then
sink = sinknull()
end
if not step then
step = pumpstep
end
local length = tonumber(headers["content-length"])
local encoding = headers["transfer-encoding"] -- shortcut
local mode = "default" -- connection close
if encoding and encoding ~= "identity" then
mode = "http-chunked"
elseif length then
mode = "by-length"
end
--hh: so length can be nil
return self.try(pumpall(sourcesocket(mode, self.c, length), sink, step))
end
function methods.receive09body(self, status, sink, step)
local source = rewindsource(sourcesocket("until-closed", self.c))
source(status)
return self.try(pumpall(source, sink, step))
end
function methods.close(self)
return self.c:close()
end
-- High level HTTP API
local function adjusturi(request)
if not request.proxy and not http.PROXY then
request = {
path = trysocket(request.path, "invalid path 'nil'"),
params = request.params,
query = request.query,
fragment = request.fragment,
}
end
return buildurl(request)
end
local function adjustheaders(request)
local headers = {
["user-agent"] = http.USERAGENT,
["host"] = gsub(request.authority, "^.-@", ""),
["connection"] = "close, TE",
["te"] = "trailers"
}
local username = request.user
local password = request.password
if username and password then
headers["authorization"] = "Basic " .. (mimeb64(username .. ":" .. unescapeurl(password)))
end
local proxy = request.proxy or http.PROXY
if proxy then
proxy = parseurl(proxy)
local username = proxy.user
local password = proxy.password
if username and password then
headers["proxy-authorization"] = "Basic " .. (mimeb64(username .. ":" .. password))
end
end
local requestheaders = request.headers
if requestheaders then
headers = lowerheaders(headers,requestheaders)
end
return headers
end
-- default url parts
local default = {
host = "",
port = PORT,
path = "/",
scheme = "http"
}
local function adjustrequest(originalrequest)
local url = originalrequest.url
local request = url and parseurl(url,default) or { }
for k, v in next, originalrequest do
request[k] = v
end
local host = request.host
local port = request.port
local uri = request.uri
if not host or host == "" then
trysocket(nil, "invalid host '" .. tostring(host) .. "'")
end
if port == "" then
request.port = PORT
end
if not uri or uri == "" then
request.uri = adjusturi(request)
end
request.headers = adjustheaders(request)
local proxy = request.proxy or http.PROXY
if proxy then
proxy = parseurl(proxy)
request.host = proxy.host
request.port = proxy.port or 3128
end
return request
end
local maxredericts = 4
local validredirects = { [301] = true, [302] = true, [303] = true, [307] = true }
local validmethods = { [false] = true, GET = true, HEAD = true }
local function shouldredirect(request, code, headers)
local location = headers.location
if not location then
return false
end
location = gsub(location, "%s", "")
if location == "" then
return false
end
local scheme = match(location, "^([%w][%w%+%-%.]*)%:")
if scheme and not SCHEMES[scheme] then
return false
end
local method = request.method
local redirect = request.redirect
local redirects = request.nredirects or 0
return redirect and validredirects[code] and validmethods[method] and redirects <= maxredericts
end
local function shouldreceivebody(request, code)
if request.method == "HEAD" then
return nil
end
if code == 204 or code == 304 then
return nil
end
if code >= 100 and code < 200 then
return nil
end
return 1
end
local tredirect, trequest, srequest
tredirect = function(request, location)
local result, code, headers, status = trequest {
url = absoluteurl(request.url,location),
source = request.source,
sink = request.sink,
headers = request.headers,
proxy = request.proxy,
nredirects = (request.nredirects or 0) + 1,
create = request.create,
}
if not headers then
headers = { }
end
if not headers.location then
headers.location = location
end
return result, code, headers, status
end
trequest = function(originalrequest)
local request = adjustrequest(originalrequest)
local connection = openhttp(request.host, request.port, request.create)
local headers = request.headers
connection:sendrequestline(request.method, request.uri)
connection:sendheaders(headers)
if request.source then
connection:sendbody(headers, request.source, request.step)
end
local code, status = connection:receivestatusline()
if not code then
connection:receive09body(status, request.sink, request.step)
return 1, 200
end
while code == 100 do
headers = connection:receiveheaders()
code, status = connection:receivestatusline()
end
headers = connection:receiveheaders()
if shouldredirect(request, code, headers) and not request.source then
connection:close()
return tredirect(originalrequest,headers.location)
end
if shouldreceivebody(request, code) then
connection:receivebody(headers, request.sink, request.step)
end
connection:close()
return 1, code, headers, status
end
-- turns an url and a body into a generic request
local function genericform(url, body)
local buffer = { }
local request = {
url = url,
sink = sinktable(buffer),
target = buffer,
}
if body then
request.source = stringsource(body)
request.method = "POST"
request.headers = {
["content-length"] = #body,
["content-type"] = "application/x-www-form-urlencoded"
}
end
return request
end
http.genericform = genericform
srequest = function(url, body)
local request = genericform(url, body)
local _, code, headers, status = trequest(request)
return concat(request.target), code, headers, status
end
http.request = protectsocket(function(request, body)
if type(request) == "string" then
return srequest(request, body)
else
return trequest(request)
end
end)
package.loaded["socket.http"] = http
return http
|