google server to server

const jwt = require('jsonwebtoken');
// 剛才下載的檔案
const googleServerKey = require("./test-f9099.json")
const token = jwt.sign({
    "iss": googleServerKey.client_email,
    scope,
    "aud": "https://www.googleapis.com/oauth2/v4/token",
    "exp": Math.floor(Date.now() / 1000) + (60 * 60),
    "iat": Math.floor(Date.now() / 1000)
}, googleServerKey.private_key, {
    header: {
        "alg": "RS256",
        "typ": "JWT"
    }
})

function getAccessTokenByJWT() {
    let data = qs.stringify({
        grant_type: "urn:ietf:params:oauth:grant-type:jwt-bearer",
        assertion: token,
    });
    const headers = {
        'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
    };
    return axios.post('https://www.googleapis.com/oauth2/v4/token', data, {
        headers
    });
}