libs/httpclient/luasrc/httpclient.lua

   1 --[[
   2 LuCI - Lua Development Framework
   3
   4 Copyright 2009 Steven Barth <steven@midlink.org>
   5
   6 Licensed under the Apache License, Version 2.0 (the "License");
   7 you may not use this file except in compliance with the License.
   8 You may obtain a copy of the License at
   9
  10         http://www.apache.org/licenses/LICENSE-2.0
  11
  12 $Id$
  13 ]]--
  14
  15 require "nixio.util"
  16 local nixio = require "nixio"
  17
  18 local ltn12 = require "luci.ltn12"
  19 local util = require "luci.util"
  20 local table = require "table"
  21 local http = require "luci.http.protocol"
  22 local date = require "luci.http.protocol.date"
  23
  24 local type, pairs, ipairs, tonumber = type, pairs, ipairs, tonumber
  25 local unpack = unpack
  26
  27 module "luci.httpclient"
  28
  29 function chunksource(sock, buffer)
  30         buffer = buffer or ""
  31         return function()
  32                 local output
  33                 local _, endp, count = buffer:find("^([0-9a-fA-F]+);?.-\r\n")
  34                 while not count and #buffer <= 1024 do
  35                         local newblock, code = sock:recv(1024 - #buffer)
  36                         if not newblock then
  37                                 return nil, code
  38                         end
  39                         buffer = buffer .. newblock
  40                         _, endp, count = buffer:find("^([0-9a-fA-F]+);?.-\r\n")
  41                 end
  42                 count = tonumber(count, 16)
  43                 if not count then
  44                         return nil, -1, "invalid encoding"
  45                 elseif count == 0 then
  46                         return nil
  47                 elseif count + 2 <= #buffer - endp then
  48                         output = buffer:sub(endp+1, endp+count)
  49                         buffer = buffer:sub(endp+count+3)
  50                         return output
  51                 else
  52                         output = buffer:sub(endp+1, endp+count)
  53                         buffer = ""
  54                         if count - #output > 0 then
  55                                 local remain, code = sock:recvall(count-#output)
  56                                 if not remain then
  57                                         return nil, code
  58                                 end
  59                                 output = output .. remain
  60                                 count, code = sock:recvall(2)
  61                         else
  62                                 count, code = sock:recvall(count+2-#buffer+endp)
  63                         end
  64                         if not count then
  65                                 return nil, code
  66                         end
  67                         return output
  68                 end
  69         end
  70 end
  71
  72
  73 function request_to_buffer(uri, options)
  74         local source, code, msg = request_to_source(uri, options)
  75         local output = {}
  76
  77         if not source then
  78                 return nil, code, msg
  79         end
  80
  81         source, code = ltn12.pump.all(source, (ltn12.sink.table(output)))
  82
  83         if not source then
  84                 return nil, code
  85         end
  86
  87         return table.concat(output)
  88 end
  89
  90 function request_to_source(uri, options)
  91         local status, response, buffer, sock = request_raw(uri, options)
  92         if not status then
  93                 return status, response, buffer
  94         elseif status ~= 200 and status ~= 206 then
  95                 return nil, status, response
  96         end
  97
  98         if response.headers["Transfer-Encoding"] == "chunked" then
  99                 return chunksource(sock, buffer)
 100         else
 101                 return ltn12.source.cat(ltn12.source.string(buffer), sock:blocksource())
 102         end
 103 end
 104
 105 --
 106 -- GET HTTP-resource
 107 --
 108 function request_raw(uri, options)
 109         options = options or {}
 110         local pr, host, port, path = uri:match("(%w+)://([%w-.]+):?([0-9]*)(.*)")
 111         if not host then
 112                 return nil, -1, "unable to parse URI"
 113         end
 114
 115         if pr ~= "http" and pr ~= "https" then
 116                 return nil, -2, "protocol not supported"
 117         end
 118
 119         port = #port > 0 and port or (pr == "https" and 443 or 80)
 120         path = #path > 0 and path or "/"
 121
 122         options.depth = options.depth or 10
 123         local headers = options.headers or {}
 124         local protocol = options.protocol or "HTTP/1.1"
 125         headers["User-Agent"] = headers["User-Agent"] or "LuCI httpclient 0.1"
 126
 127         if headers.Connection == nil then
 128                 headers.Connection = "close"
 129         end
 130
 131         local sock, code, msg = nixio.connect(host, port)
 132         if not sock then
 133                 return nil, code, msg
 134         end
 135
 136         sock:setsockopt("socket", "sndtimeo", options.sndtimeo or 15)
 137         sock:setsockopt("socket", "rcvtimeo", options.rcvtimeo or 15)
 138
 139         if pr == "https" then
 140                 local tls = options.tls_context or nixio.tls()
 141                 sock = tls:create(sock)
 142                 local stat, code, error = sock:connect()
 143                 if not stat then
 144                         return stat, code, error
 145                 end
 146         end
 147
 148         -- Pre assemble fixes
 149         if protocol == "HTTP/1.1" then
 150                 headers.Host = headers.Host or host
 151         end
 152
 153         if type(options.body) == "table" then
 154                 options.body = http.urlencode_params(options.body)
 155         end
 156
 157         if type(options.body) == "string" then
 158                 headers["Content-Length"] = headers["Content-Length"] or #options.body
 159                 headers["Content-Type"] = headers["Content-Type"] or
 160                         "application/x-www-form-urlencoded"
 161                 options.method = options.method or "POST"
 162         end
 163
 164         if type(options.body) == "function" then
 165                 options.method = options.method or "POST"
 166         end
 167
 168         -- Assemble message
 169         local message = {(options.method or "GET") .. " " .. path .. " " .. protocol}
 170
 171         for k, v in pairs(headers) do
 172                 if type(v) == "string" or type(v) == "number" then
 173                         message[#message+1] = k .. ": " .. v
 174                 elseif type(v) == "table" then
 175                         for i, j in ipairs(v) do
 176                                 message[#message+1] = k .. ": " .. j
 177                         end
 178                 end
 179         end
 180
 181         if options.cookies then
 182                 for _, c in ipairs(options.cookies) do
 183                         local cdo = c.flags.domain
 184                         local cpa = c.flags.path
 185                         if   (cdo == host or cdo == "."..host or host:sub(-#cdo) == cdo)
 186                          and (cpa == "/" or cpa .. "/" == path:sub(#cpa+1))
 187                          and (not c.flags.secure or pr == "https")
 188                         then
 189                                 message[#message+1] = "Cookie: " .. c.key .. "=" .. c.value
 190                         end
 191                 end
 192         end
 193
 194         message[#message+1] = ""
 195         message[#message+1] = ""
 196
 197         -- Send request
 198         sock:sendall(table.concat(message, "\r\n"))
 199
 200         if type(options.body) == "string" then
 201                 sock:sendall(options.body)
 202         elseif type(options.body) == "function" then
 203                 local res = {options.body(sock)}
 204                 if not res[1] then
 205                         sock:close()
 206                         return unpack(res)
 207                 end
 208         end
 209
 210         -- Create source and fetch response
 211         local linesrc = sock:linesource()
 212         local line, code, error = linesrc()
 213
 214         if not line then
 215                 sock:close()
 216                 return nil, code, error
 217         end
 218
 219         local protocol, status, msg = line:match("^([%w./]+) ([0-9]+) (.*)")
 220
 221         if not protocol then
 222                 sock:close()
 223                 return nil, -3, "invalid response magic: " .. line
 224         end
 225
 226         local response = {status = line, headers = {}, code = 0, cookies = {}}
 227
 228         line = linesrc()
 229         while line and line ~= "" do
 230                 local key, val = line:match("^([%w-]+)%s?:%s?(.*)")
 231                 if key and key ~= "Status" then
 232                         if type(response[key]) == "string" then
 233                                 response.headers[key] = {response.headers[key], val}
 234                         elseif type(response[key]) == "table" then
 235                                 response.headers[key][#response.headers[key]+1] = val
 236                         else
 237                                 response.headers[key] = val
 238                         end
 239                 end
 240                 line = linesrc()
 241         end
 242
 243         if not line then
 244                 sock:close()
 245                 return nil, -4, "protocol error"
 246         end
 247
 248         -- Parse cookies
 249         if response.headers["Set-Cookie"] then
 250                 local cookies = response.headers["Set-Cookie"]
 251                 for _, c in ipairs(type(cookies) == "table" and cookies or {cookies}) do
 252                         local cobj = cookie_parse(c)
 253                         cobj.flags.path = cobj.flags.path or path:match("(/.*)/?[^/]*")
 254                         if not cobj.flags.domain or cobj.flags.domain == "" then
 255                                 cobj.flags.domain = host
 256                                 response.cookies[#response.cookies+1] = cobj
 257                         else
 258                                 local hprt, cprt = {}, {}
 259
 260                                 -- Split hostnames and save them in reverse order
 261                                 for part in host:gmatch("[^.]*") do
 262                                         table.insert(hprt, 1, part)
 263                                 end
 264                                 for part in cobj.flags.domain:gmatch("[^.]*") do
 265                                         table.insert(cprt, 1, part)
 266                                 end
 267
 268                                 local valid = true
 269                                 for i, part in ipairs(cprt) do
 270                                         -- If parts are different and no wildcard
 271                                         if hprt[i] ~= part and #part ~= 0 then
 272                                                 valid = false
 273                                                 break
 274                                         -- Wildcard on invalid position
 275                                         elseif hprt[i] ~= part and #part == 0 then
 276                                                 if i ~= #cprt or (#hprt ~= i and #hprt+1 ~= i) then
 277                                                         valid = false
 278                                                         break
 279                                                 end
 280                                         end
 281                                 end
 282                                 -- No TLD cookies
 283                                 if valid and #cprt > 1 and #cprt[2] > 0 then
 284                                         response.cookies[#response.cookies+1] = cobj
 285                                 end
 286                         end
 287                 end
 288         end
 289
 290         -- Follow
 291         response.code = tonumber(status)
 292         if response.code and options.depth > 0 then
 293                 if response.code == 301 or response.code == 302 or response.code == 307
 294                  and response.headers.Location then
 295                         local nexturi = response.headers.Location
 296                         if not nexturi:find("https?://") then
 297                                 nexturi = pr .. "://" .. host .. ":" .. port .. nexturi
 298                         end
 299
 300                         options.depth = options.depth - 1
 301                         sock:close()
 302
 303                         return request_raw(nexturi, options)
 304                 end
 305         end
 306
 307         return response.code, response, linesrc(true), sock
 308 end
 309
 310 function cookie_parse(cookiestr)
 311         local key, val, flags = cookiestr:match("%s?([^=;]+)=?([^;]*)(.*)")
 312         if not key then
 313                 return nil
 314         end
 315
 316         local cookie = {key = key, value = val, flags = {}}
 317         for fkey, fval in flags:gmatch(";%s?([^=;]+)=?([^;]*)") do
 318                 fkey = fkey:lower()
 319                 if fkey == "expires" then
 320                         fval = date.to_unix(fval:gsub("%-", " "))
 321                 end
 322                 cookie.flags[fkey] = fval
 323         end
 324
 325         return cookie
 326 end
 327
 328 function cookie_create(cookie)
 329         local cookiedata = {cookie.key .. "=" .. cookie.value}
 330
 331         for k, v in pairs(cookie.flags) do
 332                 if k == "expires" then
 333                         v = date.to_http(v):gsub(", (%w+) (%w+) (%w+) ", ", %1-%2-%3 ")
 334                 end
 335                 cookiedata[#cookiedata+1] = k .. ((#v > 0) and ("=" .. v) or "")
 336         end
 337
 338         return table.concat(cookiedata, "; ")
 339 end