[restful] port local JSON/REST interface to v2

mote/v2/openwrt/package/flukso/luasrc/restful.lua

@@ -0,0 +1,68 @@
+#!/usr/bin/env lua
+
+--[[
+    
+    restful.lua - CGI script providing a local RESTful API on the Fluksometer.
+
+    Copyright (c) 2010 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+]]--
+
+
+--- Decode a URL's query string
+-- @param QS		the to-be-decoded query string (optional)
+-- @return		table containing [name] = value pairs
+local function query_decode(QS)
+	local param = {}
+
+	for name, value in (QS or os.getenv("QUERY_STRING")):gmatch("([^&=]+)=([^&=]+)") do
+		param[name] = value
+	end
+
+	return param
+end
+
+--- Fetch the sensor id in the HTTP request.
+-- @return              sensor id
+local function sensor_id() 
+	return os.getenv("SCRIPT_NAME"):match("/sensor/([%x]+)")
+end
+
+
+local param   = query_decode()
+local path    = "/var/run/fluksod/sensor/"
+local version = "1.0"
+
+-- Hardcoding path and version parameters lowers GET response time from 200ms to 90ms.
+-- local uci     = require "luci.model.uci".cursor()
+-- local path    = uci:get("flukso", "main", "localDir") .. "/"
+-- local version = uci:get("flukso", "main", "localVersion")
+
+if param.interval == "minute" and param.unit == "watt" and param.version == version then
+	local pre, post =  "", ""
+	
+	if param.jsonp_callback then
+		pre, post =  param.jsonp_callback .. "(", ")"
+	end
+
+	io.input(path .. sensor_id())
+	
+	io.write("Content-Type: application/json", "\n\n")                                              
+	io.write(pre, io.read("*all"), post)
+else
+	io.write("status: 400 Bad Request", "\n\n")
+	io.write("Malformed query string: interval, unit and version query parameters are required.")
+end