LINE BOT API sample code on webscript.io (with Microsoft Translator Text API)

nikobot.lua

-- setting
local mstr_cid = 'client_id for microsoft translator text api'
local mstr_secret = 'client_secret for microsoft translator text api'
local line_id = 'Channel ID for LINE BOT API'
local line_secret = 'Channel Secret for LINE BOT API'
local line_mid = 'MID for LINE BOT API'

-- function: mstr
function mstr(text, cid, secret)
	local lom = require 'lxp.lom'
	local response, parsed

	-- get token
	response = http.request {
		url = 'https://datamarket.accesscontrol.windows.net/v2/OAuth2-13',
		method = 'POST',
		data = {
			client_id = cid,
			client_secret = secret,
			scope = 'http://api.microsofttranslator.com',
			grant_type = 'client_credentials'
		}
	}
	local token = json.parse(response.content).access_token
	log('token = ' .. token)
	
	-- detect
	response = http.request {
		url = 'http://api.microsofttranslator.com/V2/Http.svc/Detect',
		method = 'GET',
		params = {
			appId = 'Bearer ' .. token,
			text = text
		},
		headers = {
			Authorization = 'Bearer ' .. token
		}
	}
	parsed = lom.parse(response.content)
	local code_from = parsed[1]
	local code_to = 'ja'
	if code_from == 'ja' then
		code_to = 'en'
	end
	log('code_from = ' .. code_from)
	log('code_to = ' .. code_to)
	
	-- translate
	local response = http.request {
		url = 'http://api.microsofttranslator.com/V2/Http.svc/Translate',
		method = 'GET',
		params = {
			appId = 'Bearer ' .. token,
			from = code_from,
			to = code_to,
			text = text
		},
		headers = {
			Authorization = 'Bearer ' .. token
		}
	}
	parsed = lom.parse(response.content)
	return parsed[1]
end

-- create reply message from request
local body = json.parse(request.body)
local res = mstr(body.result[1].content.text, mstr_cid, mstr_secret)
local reply = body.result[1].content.from
local data = {
	['to'] = {reply},
	['toChannel'] = '1383378250',
	['eventType'] = '138311608800106203',
	['content'] = {
		['contentType'] = 1,
		['toType'] = 1,
		['text'] = res
	}
}
log('input message = ' .. body.result[1].content.text)
log('output message = ' .. res)

-- send reply
local response = http.request {
	url = 'https://trialbot-api.line.me/v1/events',
	method = 'POST',
	data = json.stringify(data),
	headers = {
		['Content-Type'] = 'application/json; charser=UTF-8',
		['X-Line-ChannelID'] = line_id,
		['X-Line-ChannelSecret'] = line_secret,
		['X-Line-Trusted-User-With-ACL'] = line_mid
	}
}

return true