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 = rawget(mod, path[j])
  27                 if not mod then
  28                         break
  29                 end
  30         end
  31         mod = type(mod) == "table" and rawget(mod, path[#path]) or nil
  32         if type(mod) == "function" then
  33                 return mod
  34         end
  35 end
  36
  37 function handle(tbl, rawsource, ...)
  38         local decoder = luci.json.Decoder()
  39         local stat = luci.ltn12.pump.all(rawsource, decoder:sink())
  40         local json = decoder:get()
  41         local response
  42         local success = false
  43
  44         if stat then
  45                 if type(json.method) == "string"
  46                  and (not json.params or type(json.params) == "table") then
  47                         if tbl[json.method] then
  48                                 response = reply(json.jsonrpc, json.id,
  49                                  proxy(resolve(tbl, json.method), unpack(json.params or {})))
  50                         else
  51                                 response = reply(json.jsonrpc, json.id,
  52                                  nil, {code=-32601, message="Method not found."})
  53                         end
  54                 else
  55                         response = reply(json.jsonrpc, json.id,
  56                          nil, {code=-32600, message="Invalid request."})
  57                 end
  58         else
  59                 response = reply("2.0", nil,
  60                  nil, {code=-32700, message="Parse error."})
  61         end
  62
  63         return luci.json.Encoder(response, ...):source()
  64 end
  65
  66 function reply(jsonrpc, id, res, err)
  67         require "luci.json"
  68         id = id or luci.json.null
  69
  70         -- 1.0 compatibility
  71         if jsonrpc ~= "2.0" then
  72                 jsonrpc = nil
  73                 res = res or luci.json.null
  74                 err = err or luci.json.null
  75         end
  76
  77         return {id=id, result=res, error=err, jsonrpc=jsonrpc}
  78 end
  79
  80 function proxy(method, ...)
  81         local res = {luci.util.copcall(method, ...)}
  82         local stat = table.remove(res, 1)
  83
  84         if not stat then
  85                 return nil, {code=-32602, message="Invalid params.", data=table.remove(res, 1)}
  86         else
  87                 if #res <= 1 then
  88                         return res[1] or luci.json.null
  89                 else
  90                         return res
  91                 end
  92         end
  93 end