!README.md

google-oauth-for-google-photos

Setup

$ npm run setup
# Edit ./config.js file

Execute

$ npm run first
$ npm run second

.gitignore

package-lock.json
node_modules/**
.editorconfig
.eslintrc.yaml
.prettierrc.json
config.js

config.example.js

const ClientId = "xxxxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com";
const ClientSecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
const RedirectURI = "https://example.com/";

module.exports = { ClientId, ClientSecret, RedirectURI };

first.js

const { ClientId, RedirectURI } = require("./config");

// https://developers.google.com/photos/library/guides/authorization
const GooglePhotosScope = "https://www.googleapis.com/auth/photoslibrary.readonly";

const redirectUrl = new URL("https://accounts.google.com/o/oauth2/v2/auth");
redirectUrl.searchParams.set("response_type", "code");
redirectUrl.searchParams.set("client_id", ClientId);
redirectUrl.searchParams.set("redirect_uri", RedirectURI);
redirectUrl.searchParams.set("access_type", "offline");
redirectUrl.searchParams.set("prompt", "consent");
redirectUrl.searchParams.set("state", "dummy");
redirectUrl.searchParams.set("scope", `${GooglePhotosScope}`);

console.log(redirectUrl.toString());

package.json

{
  "name": "nodejs-script",
  "author": "mryhryki",
  "private": true,
  "license": "MIT",
  "engines": {
    "node": "18.x",
    "npm": "9.x"
  },
  "scripts": {
    "setup": "test -f ./config.js || cp ./config.example.js ./config.js",
    "first": "node ./first.js",
    "second": "node ./second.js"
  }
}

second.js

const { ClientId, ClientSecret, RedirectURI } = require("./config");

const redirectedUrl = new URL(
  "https://mryhryki.com/api/health?state=dummy&code=4/0AfgeXvuDCXZiDTWjQNK3-Hd7XIN-YJ1WwYdRLEefaZp0Lx2LLrHXul-jEp1-xdxXuscHuA&scope=https://www.googleapis.com/auth/photoslibrary.readonly"
);
const code = redirectedUrl.searchParams.get("code");
console.log("Code:", code);

const body = new URL("https://example.com");
body.searchParams.set("grant_type", "authorization_code");
body.searchParams.set("access_type", "offline");
body.searchParams.set("client_id", ClientId);
body.searchParams.set("redirect_uri", RedirectURI);
body.searchParams.set("code", code);

const basicAuth = Buffer.from(`${ClientId}:${ClientSecret}`).toString("base64");
fetch("https://oauth2.googleapis.com/token", {
  method: "POST",
  headers: {
    Authorization: `Basic ${basicAuth}`,
    "Content-Type": "application/x-www-form-urlencoded"
  },
  body: body.search.slice(1)
}).then((response) => response.json())
  .then((body) => {
    console.log("[Response]")
    Object.entries(body).forEach(([key, val]) => {
      console.log(`${key.padEnd(20, " ")}: ${val}`);
    });
  });