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update google docs

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AJ ONeal 2020-08-18 05:43:44 +00:00
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@ -35,3 +35,47 @@ Create Google Credentials
3. Select `Web Application`
4. Fill out the same test domain and test app name as before
5. Save the ID and Secret to a place you won't forget (perhaps a .gitignored .env)
Update your signin page.
1. You need to put your default scopes (i.e. `profile email`) and client ID in the meta tag of your login page HTML. `profile` is the minimum scope and is always returned.
```html
<head>
<meta name="google-signin-scope" content="email">
<meta
name="google-signin-client_id"
content="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com"
/>
</head>
```
2. Although it should be possible to use an thin OAuth client, you'll probably want to start by including the (huge) Google platform.js
```html
<script src="https://apis.google.com/js/platform.js" async defer></script>
```
3. You can start off with the Google's sign in button, but you need your own `data-onsuccess` callback. You can also adjust the `data-scope` per button to include more stuff.
```html
<div
class="g-signin2"
data-onsuccess="ongsignin"
data-scope="profile email https://www.googleapis.com/auth/spreadsheets.readonly https://www.googleapis.com/auth/drive.readonly"
></div>
<script>
window.ongsignin = function (gauth) {
// Note: this is a special prototype-style instance object with few
// enumerable properties (which don't make sense). Requires API docs.
// See https://developers.google.com/identity/sign-in/web
console.log(goauth)
};
</script>
```
4. Despite the documentation stating that passing a token as a query is deprecated and to use the `Authorization` header, the inspect token URL only supports the query parameter: `GET https://oauth2.googleapis.com/tokeninfo?id_token=<token>`
- You can also validate the token with Google's public key
- https://accounts.google.com/.well-known/openid-configuration
- https://www.googleapis.com/oauth2/v3/certs (note that one of the Key IDs will match that of your kid)
5. While testing you'll probably want to revoke the app's permissions
- Go to https://myaccount.google.com/permissions
- Under "Third-party apps with account access" click "Manage third-party access" and search in the long list and click "Remove access".
- Under "Signing in to other sites" click "Signing in with Google" and search in the list to revoke access
- Active tokens will persist until they expire (1 hour), so you may need to clear cache, cookies, etc, which can be a pain
5. Sign out can be accomplished with a button that calls `gapi.auth2.getAuthInstance().signOut().then(function() { });`