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const region = 'asia-northeast1'; | |
const runtimeOpts = { | |
timeoutSeconds: 10, | |
memory: "2GB" | |
}; | |
const functions = require('firebase-functions'); | |
const request = require("request-promise"); | |
const querystring = require('querystring'); | |
const admin = require('firebase-admin'); | |
let LINE_HEADER; | |
const LINE_OAUTH_API = "https://api.line.me/v2/oauth"; | |
const LINE_MESSAGING_API = "https://api.line.me/v2/bot/message"; | |
const CHANNEL_ID = "YOUR-CHANNEL-ID"; | |
const CHANNEL_SECRET = "YOUR-CHANNEL-SECRET"; | |
admin.initializeApp(); | |
exports.AccessTokenBot = functions.region(region).runWith(runtimeOpts).https.onRequest(async (req, res) => { | |
let event = req.body.events[0] | |
switch (event.type) { | |
case 'message': | |
if (event.message.type === 'text') { | |
if(event.message.text === 'register') { | |
let access_token = await issue_access_token(); | |
access_token = JSON.parse(access_token); | |
await initialLINE(access_token['token_type'], access_token['access_token']); | |
await admin.database().ref('token').child(event.source.userId).set(access_token); | |
reply(event.replyToken, { | |
type: 'text', | |
text: '\uDBC0\uDC7F ลงทะเบียน token เรียบร้อยแล้ว เอาไปใช้ได้เลย\n\n' + JSON.stringify(access_token) | |
}); | |
} else if(event.message.text === 'revoke') { | |
let token = await admin.database().ref('token').child(event.source.userId).once('value'); | |
await initialLINE(token.val().token_type, token.val().access_token ); | |
await admin.database().ref('token').child(event.source.userId).remove(); | |
await reply(event.replyToken, { | |
type: 'text', | |
text: '\uDBC0\uDC9C ลบ token เรียบร้อยแล้ว จะใช้มาขอใหม่น้าา' | |
}); | |
revoke_access_token(token.val().access_token); | |
} | |
} | |
break; | |
} | |
res.status(200).send("ok").end(); | |
}); | |
const initialLINE = async(token_type, token) => { | |
LINE_HEADER = { | |
"Content-Type": "application/json", | |
"Authorization": `${token_type} ${token}` | |
}; | |
} | |
const issue_access_token = async() => { | |
let params = { | |
grant_type: 'client_credentials', | |
client_id: CHANNEL_ID, | |
client_secret: CHANNEL_SECRET | |
}; | |
let formData = querystring.stringify(params); | |
let contentLength = formData.length; | |
let promise = new Promise(resolve => { | |
request.post({ | |
url: `${LINE_OAUTH_API}/accessToken`, | |
headers: { | |
'Content-Length': contentLength, | |
'Content-Type': 'application/x-www-form-urlencoded' | |
}, | |
body: formData | |
}, (error, response, body) => { | |
if(!error) | |
resolve(body); | |
else | |
resolve(error); | |
}) | |
}); | |
let result = await promise; | |
return result; | |
}; | |
const revoke_access_token = (access_token) => { | |
let params = { | |
access_token: access_token | |
}; | |
let formData = querystring.stringify(params); | |
return request.post({ | |
uri: `${LINE_OAUTH_API}/revoke`, | |
headers: { | |
"Content-Type": "application/x-www-form-urlencoded" | |
}, | |
body: formData | |
}) | |
}; | |
const reply = (token, payload) => { | |
return request.post({ | |
uri: `${LINE_MESSAGING_API}/reply`, | |
headers: LINE_HEADER, | |
body: JSON.stringify({ | |
replyToken: token, | |
messages: [payload] | |
}) | |
}) | |
} |
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