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index.js
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index.js
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require("dotenv").config();
const express = require("express");
const app = express();
app.use(express.static(path.resolve(__dirname, './client/build')));
const axios = require("axios");
const CLIENT_ID = process.env.CLIENT_ID;
const CLIENT_SECRET = process.env.CLIENT_SECRET;
const REDIRECT_URI = process.env.REDIRECT_URI;
const FRONTEND_URI = process.env.FRONTEND_URI;
const PORT = process.env.PORT || 8888;
const path = require('path');
console.log(REDIRECT_URI);
//utility function
const generateRandomString = (length) => {
var result = "";
var characters =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var charactersLength = characters.length;
for (var i = 0; i < length; i++) {
result += characters.charAt(Math.floor(Math.random() * charactersLength));
}
return result;
};
const stateKey = "spotify_auth_state";
app.get("/login", (req, res) => {
const state = generateRandomString(16);
res.cookie(stateKey, state);
const scope = ["user-read-private", "user-read-email", "user-top-read"].join(
" "
);
const queryParams = new URLSearchParams({
client_id: CLIENT_ID,
response_type: "code",
redirect_uri: REDIRECT_URI,
state: state,
scope: scope,
}).toString();
res.redirect(`https://accounts.spotify.com/authorize?${queryParams}`);
});
app.get("/callback", (req, res) => {
const code = req.query.code || null;
axios({
method: "post",
url: "https://accounts.spotify.com/api/token",
data: new URLSearchParams({
grant_type: "authorization_code",
code: code,
redirect_uri: REDIRECT_URI,
}),
headers: {
"content-type": "application/x-www-form-urlencoded",
Authorization: `Basic ${new Buffer.from(
`${CLIENT_ID}:${CLIENT_SECRET}`
).toString("base64")}`,
},
})
.then((response) => {
if (response.status === 200) {
// console.log(response.data.refresh_token)
// console.log(response.data.access_token)
const { refresh_token, access_token, token_type, expires_in } =
response.data;
//urlsearchparamsobj
const qParams = new URLSearchParams({
access_token,
refresh_token,
expires_in,
});
res.redirect(`${FRONTEND_URI}?${qParams}`);
// axios
// .get(
// `https://localhost:8888/refresh_token?refresh_token=${refresh_token}`
// )
// .then((response) => {
// res.send(`<pre>${JSON.stringify(response.data, null, 2)}</pre>`);
// })
// .catch((error) => {
// res.send(error);
// });
} else {
res.redirect(`/?${querystring.stringify({ error: "invalid_token" })}`);
}
})
.catch((error) => {
res.send(error);
});
});
//refresh token
app.get("/refresh_token", (req, res) => {
const { refresh_token } = req.query;
axios({
method: "post",
url: "https://accounts.spotify.com/api/token",
data: new URLSearchParams({
grant_type: "refresh_token",
refresh_token: refresh_token,
}),
headers: {
"content-type": "application/x-www-form-urlencoded",
Authorization: `Basic ${new Buffer.from(
`${CLIENT_ID}:${CLIENT_SECRET}`
).toString("base64")}`,
},
})
.then((response) => {
res.send(response.data);
})
.catch((error) => {
res.send(error);
});
});
app.get('*', (req, res) => {
res.sendFile(path.resolve(__dirname, './client/build', 'index.html'));
});
app.listen(PORT, () => {
console.log(`Listening on ${PORT}`);
});