128 lines
No EOL
3.8 KiB
Markdown
128 lines
No EOL
3.8 KiB
Markdown
# auth_oauth2
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[](https://pub.dartlang.org/packages/angel_auth_oauth2)
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`package:angel_auth` strategy for OAuth2 login, i.e. Facebook or Github.
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# Usage
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First, create an options object:
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```dart
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configureServer(Angel app) async {
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// Load from a Map, i.e. app config:
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var opts = new AngelOAuth2Options.fromJson(map);
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// Create in-place:
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var opts = const AngelAuthOAuth2Options(
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callback: '<callback-url>',
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key: '<client-id>',
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secret: '<client-secret>',
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authorizationEndpoint: '<authorization-endpoint>',
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tokenEndpoint: '<access-token-endpoint>');
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}
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```
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After getting authenticated against the remote server, we need to be able to identify
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users within our own application. Use an `OAuth2Verifier` to associate remote users
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with local users.
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```dart
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/// You might use a pure function to create a verifier that queries a
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/// given service.
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OAuth2Verifier oauth2verifier(Service userService) {
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return (oauth2.Client client) async {
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var response = await client.get('https://api.github.com/user');
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var ghUser = JSON.decode(response.body);
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var id = ghUser['id'];
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Iterable<Map> matchingUsers = await userService.index({
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'query': {'githubId': id}
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});
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if (matchingUsers.isNotEmpty) {
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// Return the corresponding user, if it exists
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return User.parse(matchingUsers.firstWhere((u) => u['githubId'] == id));
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} else {
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// Otherwise,create a user
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return await userService.create({'githubId': id}).then(User.parse);
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}
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};
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}
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```
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Now, initialize an `OAuth2Strategy`, using the options and verifier.
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You'll also need to provide a name for this instance of the strategy.
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Consider using the name of the remote authentication provider (ex. `facebook`).
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```dart
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configureServer(Angel app) {
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// ...
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var oauthStrategy =
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new OAuth2Strategy('github', OAUTH2_CONFIG, oauth2Verifier(app.service('users')));
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}
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```
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Lastly, connect it to an `AngelAuth` instance, and wire it up to an `Angel` server.
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Set up two routes:
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1. Redirect users to the external provider
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2. Acts as a callback and handles an access code
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In the case of the callback route, you may want to display an HTML page that closes
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a popup window. In this case, use `confirmPopupAuthentication`, which is bundled with
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`package:angel_auth`, as a `callback` function:
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```dart
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configureServer(Angel app) async {
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// ...
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var auth = new AngelAuth();
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auth.strategies.add(oauth2Strategy);
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// Redirect
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app.get('/auth/github', auth.authenticate('github'));
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// Callback
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app.get('/auth/github/callback', auth.authenticate(
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'github',
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new AngelAuthOptions(callback: confirmPopupAuthentication())
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));
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// Connect the plug-in!!!
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await app.configure(auth);
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}
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```
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## Custom Scope Delimiter
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This package should work out-of-the-box for most OAuth2 providers, such as Github or Dropbox.
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However, if your OAuth2 scopes are separated by a delimiter other than the default (`' '`),
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you can add it in the `AngelOAuth2Options` constructor:
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```dart
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configureServer(Angel app) async {
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var opts = const AngelOAuth2Options(
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// ...
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delimiter: ','
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);
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}
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```
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## Handling non-JSON responses
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Many OAuth2 providers do not follow the specification, and do not return
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`application/json` responses.
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You can add a `getParameters` callback to parse the contents of any arbitrary
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response:
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```dart
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var opts = const AngelOAuth2Options(
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// ...
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getParameters: (contentType, body) {
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if (contentType.type == 'application') {
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if (contentType.subtype == 'x-www-form-urlencoded')
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return Uri.splitQueryString(body);
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else if (contentType.subtype == 'json') return JSON.decode(body);
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}
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throw new FormatException('Invalid content-type $contentType; expected application/x-www-form-urlencoded or application/json.');
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}
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);
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``` |