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 require "luci.json"
  18
  19 function resolve(mod, method)
  20         local path = luci.util.split(method, ".")
  21
  22         for j=1, #path-1 do
  23                 if not type(mod) == "table" then
  24                         break
  25                 end
  26                 mod = mod[path[j]]
  27                 if not mod then
  28                         break
  29                 end
  30         end
  31         mod = type(mod) == "table" and mod[path[#path]] or nil
  32         if type(mod) == "function" then
  33                 return mod
  34         end
  35 end
  36
  37 function handle(tbl, rawdata)
  38         local stat, json = luci.util.copcall(luci.json.Decode, rawdata)
  39         local response
  40         local success = false
  41
  42         if stat then
  43                 if type(json.method) == "string"
  44                  and (not json.params or type(json.params) == "table") then
  45                         if tbl[json.method] then
  46                                 response = reply(json.jsonrpc, json.id,
  47                                  proxy(resolve(tbl, json.method), unpack(json.params or {})))
  48                         else
  49                                 response = reply(json.jsonrpc, json.id,
  50                                  nil, {code=-32601, message="Method not found."})
  51                         end
  52                 else
  53                         response = reply(json.jsonrpc, json.id,
  54                          nil, {code=-32600, message="Invalid request."})
  55                 end
  56         else
  57                 response = reply(json.jsonrpc, nil,
  58                  nil, {code=-32700, message="Parse error."})
  59         end
  60
  61         return luci.json.Encode(response)
  62 end
  63
  64 function reply(jsonrpc, id, res, err)
  65         require "luci.json"
  66         id = id or luci.json.Null
  67
  68         -- 1.0 compatibility
  69         if jsonrpc ~= "2.0" then
  70                 jsonrpc = nil
  71                 res = res or luci.json.Null
  72                 err = err or luci.json.Null
  73         end
  74
  75         return {id=id, result=res, error=err, jsonrpc=jsonrpc}
  76 end
  77
  78 function proxy(method, ...)
  79         local res = {luci.util.copcall(method, ...)}
  80         local stat = table.remove(res, 1)
  81
  82         if not stat then
  83                 return nil, {code=-32602, message="Invalid params.", data=table.remove(res, 1)}
  84         else
  85                 if #res <= 1 then
  86                         return res[1] or luci.json.Null
  87                 else
  88                         return res
  89                 end
  90         end
  91 end