83 lines
2.4 KiB
Lua
83 lines
2.4 KiB
Lua
--[[
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LuCI - Lua Configuration Interface
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Copyright 2008 Steven Barth <steven@midlink.org>
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Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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$Id: rpc.lua 5118 2009-07-23 03:32:30Z jow $
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]]--
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module ("luci.controller.restful", package.seeall)
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function index()
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local uci = require "luci.model.uci".cursor()
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if uci:get("flukso", "main", "localEnable") == "1" then
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uci:foreach("flukso", "sensor", function(section)
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entry({section.id}, call("rest_sensor", {section.id}))
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end)
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end
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end
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--- Decode a URL query string
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-- @param QS the to-be-decoded query string
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-- @return table containing [name] = value pairs
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-- @see rest_sensor
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local function decode(QS)
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local param = {}
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for name, value in QS:gmatch("([^&=]+)=([^&=]+)") do
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param[name] = value
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end
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return param
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end
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--- Return a 400 error code to the client
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-- @param message custom error message (optional)
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-- @return false
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function error400(message)
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local http = require "luci.http"
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http.status(400, "Bad Request")
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message = message or "Bad Request"
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http.prepare_content("text/plain")
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http.write(message)
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return false
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end
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--- Callback function for Flukso RESTful API
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-- @param id requested sensor id (table)
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-- @return json-encoded time series data
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function rest_sensor(id)
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local http = require "luci.http"
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local ltn12 = require "luci.ltn12"
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local uci = require "luci.model.uci".cursor()
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local path = uci:get("flukso", "main", "localDir")
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local version = uci:get("flukso", "main", "localVersion")
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local param = decode(http.getenv("QUERY_STRING"))
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http.prepare_content("application/json")
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if param.interval == "minute" and param.unit == "watt" and param.version == version then
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local source = ltn12.source.file(io.open(path .. "/" .. id[1], "r"))
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if param.jsonp_callback then
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source = ltn12.source.cat(ltn12.source.string(param.jsonp_callback .. "("), source, ltn12.source.string(")"))
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end
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ltn12.pump.all(source, http.write)
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else
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error400("Malformed query string: interval, unit and version query parameters are required.")
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end
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end
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