modules/rpc/luasrc/jsonrpc.lua

   1 --[[
   2 LuCI - Lua Configuration Interface
   3
   4 Copyright 2008 Steven Barth <steven@midlink.org>
   5 Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14 ]]--
  15
  16 module("luci.jsonrpc", package.seeall)
  17
  18 function resolve(mod, method)
  19         local path = luci.util.split(value, ".")
  20
  21         for j=1, #path-1 do
  22                 if not type(mod) == "table" then
  23                         break
  24                 end
  25                 mod = mod[path[j]]
  26                 if not mod then
  27                         break
  28                 end
  29         end
  30         mod = type(mod) == "table" and mod[path[#path]] or nil
  31         if type(mod) == "function" then
  32                 return mod
  33         end
  34 end
  35
  36 function handle(tbl, rawdata)
  37         local stat, json = luci.util.copcall(luci.json.Decode, rawdata)
  38         local response
  39         local success = false
  40
  41         if stat then
  42                 if type(json.method) == "string"
  43                  and (not json.params or type(json.params) == "table") then
  44                         if tbl[json.method] then
  45                                 response = reply(json.jsonrpc, json.id,
  46                                  proxy(resolve(tbl, json.method), unpack(json.params)))
  47                         else
  48                                 response = reply(json.jsonrpc, json.id,
  49                                  nil, {code=-32601, message="Method not found."})
  50                         end
  51                 else
  52                         response = reply(json.jsonrpc, json.id,
  53                          nil, {code=-32600, message="Invalid request."})
  54                 end
  55         else
  56                 response = reply(json.jsonrpc, nil,
  57                  nil, {code=-32700, message="Parse error."})
  58         end
  59
  60         return luci.json.Encode(response)
  61 end
  62
  63 function reply(jsonrpc, id, res, err)
  64         require "luci.json"
  65         id = id or luci.json.Null
  66
  67         -- 1.0 compatibility
  68         if jsonrpc ~= "2.0" then
  69                 jsonrpc = nil
  70                 res = res or luci.json.Null
  71                 err = err or luci.json.Null
  72         end
  73
  74         return {id=id, result=res, error=err, jsonrpc=jsonrpc}
  75 end
  76
  77 function proxy(method, ...)
  78         local res = {luci.util.copcall(method, unpack(params))}
  79         local stat = table.remove(res, 1)
  80
  81         if not stat then
  82                 return nil, {code=-32602, message="Invalid params.", data=table.remove(res, 1)}
  83         else
  84                 return (#res <= 1) and res[1] or res
  85         end
  86 end