libs/httpclient/luasrc/httpclient.lua

   1 --[[
   2 LuCI - Lua Configuration Interface
   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
  23 local type, pairs, tonumber, print = type, pairs, tonumber, print
  24
  25 module "luci.httpclient"
  26
  27 function chunksource(sock, buffer)
  28         buffer = buffer or ""
  29         return function()
  30                 local output
  31                 local _, endp, count = buffer:find("^([0-9a-fA-F]+);?.-\r\n")
  32                 while not count and #buffer <= 1024 do
  33                         local newblock, code = sock:recv(1024 - #buffer)
  34                         if not newblock then
  35                                 return nil, code
  36                         end
  37                         buffer = buffer .. newblock
  38                         _, endp, count = buffer:find("^([0-9a-fA-F]+);?.-\r\n")
  39                 end
  40                 count = tonumber(count, 16)
  41                 if not count then
  42                         return nil, -1, "invalid encoding"
  43                 elseif count == 0 then
  44                         return nil
  45                 elseif count + 2 <= #buffer - endp then
  46                         output = buffer:sub(endp+1, endp+count)
  47                         buffer = buffer:sub(endp+count+3)
  48                         return output
  49                 else
  50                         output = buffer:sub(endp+1, endp+count)
  51                         buffer = ""
  52                         if count - #output > 0 then
  53                                 local remain, code = sock:recvall(count-#output)
  54                                 if not remain then
  55                                         return nil, code
  56                                 end
  57                                 output = output .. remain
  58                                 count, code = sock:recvall(2)
  59                         else
  60                                 count, code = sock:recvall(count+2-#buffer+endp)
  61                         end
  62                         if not count then
  63                                 return nil, code
  64                         end
  65                         return output
  66                 end
  67         end
  68 end
  69
  70
  71 function request_to_buffer(uri, options)
  72         local source, code, msg = request_to_source(uri, options)
  73         local output = {}
  74
  75         if not source then
  76                 return nil, code, msg
  77         end
  78
  79         source, code = ltn12.pump.all(source, (ltn12.sink.table(output)))
  80
  81         if not source then
  82                 return nil, code
  83         end
  84
  85         return table.concat(output)
  86 end
  87
  88 function request_to_source(uri, options)
  89         local status, response, buffer, sock = request_raw(uri, options)
  90         if not status then
  91                 return status, response, buffer
  92         elseif status ~= 200 and status ~= 206 then
  93                 return nil, status, response
  94         end
  95
  96         if response["Transfer-Encoding"] == "chunked" then
  97                 return chunksource(sock, buffer)
  98         else
  99                 return ltn12.source.cat(ltn12.source.string(buffer), sock:blocksource())
 100         end
 101 end
 102
 103 --
 104 -- GET HTTP-resource
 105 --
 106 function request_raw(uri, options)
 107         options = options or {}
 108         local pr, host, port, path = uri:match("(%w+)://([%w-.]+):?([0-9]*)(.*)")
 109         if not host then
 110                 return nil, -1, "unable to parse URI"
 111         end
 112
 113         if pr ~= "http" then
 114                 return nil, -2, "protocol not supported"
 115         end
 116
 117         port = #port > 0 and port or "80"
 118         path = #path > 0 and path or "/"
 119
 120         options.depth = options.depth or 10
 121         local headers = options.headers or {}
 122         local protocol = options.protocol or "HTTP/1.1"
 123         local method  = options.method or "GET"
 124         headers["User-Agent"] = headers["User-Agent"] or "LuCI httpclient 0.1"
 125
 126         if headers.Connection == nil then
 127                 headers.Connection = "close"
 128         end
 129
 130         local sock, code, msg = nixio.connect(host, port)
 131         if not sock then
 132                 return nil, code, msg
 133         end
 134
 135         sock:setsockopt("socket", "sndtimeo", options.sndtimeo or 15)
 136         sock:setsockopt("socket", "rcvtimeo", options.rcvtimeo or 15)
 137
 138         -- Pre assemble fixes
 139         if protocol == "HTTP/1.1" then
 140                 headers.Host = headers.Host or host
 141         end
 142
 143         if type(options.body) == "table" then
 144                 options.body = http.urlencode_params(options.body)
 145                 headers["Content-Type"] = headers["Content-Type"] or
 146                         "application/x-www-form-urlencoded"
 147         end
 148
 149         if type(options.body) == "string" then
 150                 headers["Content-Length"] = headers["Content-Length"] or #options.body
 151         end
 152
 153         -- Assemble message
 154         local message = {method .. " " .. path .. " " .. protocol}
 155
 156         for k, v in pairs(headers) do
 157                 if v then
 158                         message[#message+1] = k .. ": " .. v
 159                 end
 160         end
 161         message[#message+1] = ""
 162         message[#message+1] = ""
 163
 164         -- Send request
 165         sock:sendall(table.concat(message, "\r\n"))
 166
 167         if type(options.body) == "string" then
 168                 sock:sendall(options.body)
 169         end
 170
 171         -- Create source and fetch response
 172         local linesrc = sock:linesource()
 173         local line, code, error = linesrc()
 174
 175         if not line then
 176                 return nil, code, error
 177         end
 178
 179         local protocol, status, msg = line:match("^(HTTP/[0-9.]+) ([0-9]+) (.*)")
 180
 181         if not protocol then
 182                 return nil, -3, "invalid response magic: " .. line
 183         end
 184
 185         local response = {Status=line}
 186
 187         line = linesrc()
 188         while line and line ~= "" do
 189                 local key, val = line:match("^([%w-]+)%s?:%s?(.*)")
 190                 if key and key ~= "Status" then
 191                         response[key] = val
 192                 end
 193                 line = linesrc()
 194         end
 195
 196         if not line then
 197                 return nil, -4, "protocol error"
 198         end
 199
 200         -- Follow
 201         local code = tonumber(status)
 202         if code and options.depth > 0 then
 203                 if code == 301 or code == 302 or code == 307 and response.Location then
 204                         local nexturi = response.Location
 205                         if not nexturi:find("https?://") then
 206                                 nexturi = pr .. "://" .. host .. ":" .. port .. nexturi
 207                         end
 208
 209                         options.depth = options.depth - 1
 210                         sock:close()
 211
 212                         return request_raw(nexturi, options)
 213                 end
 214         end
 215
 216         return code, response, linesrc(true), sock
 217 end