Test external auth providers credentials (#745)

Test Facebook credentials

flutter/realm_flutter/tests/pubspec.yaml

@@ -26,7 +26,6 @@ dev_dependencies:
   flutter_lints: ^2.0.1
   build_runner: ^2.1.2
   test: ^1.20.1
-  http: ^0.13.4
 
 flutter:
   uses-material-design: true

lib/src/cli/atlas_apps/baas_client.dart

@@ -238,6 +238,53 @@ class BaasClient {
             "field_name": "company"
           }''');
     }
+
+    if (confirmationType == null) {
+      const facebookSecret = "876750ac6d06618b323dee591602897f";
+      final dynamic createFacebookSecretResult = await _post('groups/$_groupId/apps/$appId/secrets', '{"name":"facebookSecret","value":"$facebookSecret"}');
+      String facebookClientSecretKeyName = createFacebookSecretResult['name'] as String;
+      await enableProvider(app, 'oauth2-facebook', config: '''{
+          "clientId": "1265617494254819"
+          }''', secretConfig: '''{
+          "clientSecret": "$facebookClientSecretKeyName"
+          }''', metadataFelds: '''{
+            "required": true,
+            "name": "name"
+          },
+          {
+            "required": true,
+            "name": "first_name"
+          },
+          {
+            "required": true,
+            "name": "last_name"
+          },
+          {
+            "required": false,
+            "name": "email"
+          },
+          {
+            "required": false,
+            "name": "gender"
+          },
+          {
+            "required": false,
+            "name": "birthday"
+          },
+          {
+            "required": false,
+            "name": "min_age"
+          },
+          {
+            "required": false,
+            "name": "max_age"
+          },
+          {
+            "required": false,
+            "name": "picture"
+          }''');
+    }
+
     print('Creating database db_$name$_appSuffix');
 
     await _createMongoDBService(app, '''{

test/README.md

@@ -187,3 +187,16 @@ For the purpose of the tests the token could be generated by the following proce
         ```
     * Once you have the token you can use it to login in the tests with `app.login(Credentials.jwt(token))`. Be sure that the public key configured in the cloud apps is from the correct key pair and corresponds to the private key used for generating this token.
 
+## Manually configure Facebook authentication providers
+
+### Facebook login
+
+1. Login to https://developers.facebook.com/ with account [email protected]
+2. Go to facebook app `"DartCI"`
+3. Go to [Settings/Basic](https://developers.facebook.com/apps/1265617494254819/settings/basic/) and you will find `App ID` and `App secret`
+4. Following [Facebook Authentication Instruction](https://www.mongodb.com/docs/atlas/app-services/authentication/facebook/) you have to enable facebook authentication provider in [cloud-qa](https://cloud-qa.mongodb.com/) app. Then set `Client ID = App ID` and `Client Secret = App secret`
+5. Go back to https://developers.facebook.com/ in menu [Roles/Test Users](https://developers.facebook.com/apps/1265617494254819/roles/test-users/) and select `"Get a user access token"` option for one of the test users. 
+This access token could be used for facebook login tests with `Credentials.facebook(accessToken)`. 
+This token will expire fast. If you need long term token you can receive it from this request 
+https://graph.facebook.com/v14.0/oauth/access_token?grant_type=fb_exchange_token&client_id={`Client ID`}&client_secret={`Client Secret`}&fb_exchange_token={copied access token from `"Get a user access token"`}
+6. Use the recieved token in the test. It will be available for 3.5 days.

test/credentials_test.dart

@@ -448,4 +448,23 @@ Future<void> main([List<String>? args]) async {
       await app.logIn(credentials);
     }, throws<RealmException>("crypto/rsa: verification error"));
   });
+
+  ///See test/README.md section 'Manually configure Facebook, Google and Apple authentication providers'"
+  baasTest('Facebook credentials - login', (configuration) async {
+    final app = App(configuration);
+    final accessToken =
+        'EAARZCEokqpOMBAKoIHgaG6bqY6LLseGHcQjYdoPhv9FdB89mkVZBWQFOmZCuVeuRfIa5cMtQANLpZBUQI0n4qb4TZCZCAI3vXZC9Oud2qRiieQDtXqE4abZBQJorcBMzECVfsDlus7hk63zW3XzuFCZAxF4BCdRZBHXlGXIzaHhFHhY72aU1apX0tC';
+    final credentials = Credentials.facebook(accessToken);
+    final user = await app.logIn(credentials);
+    expect(user.state, UserState.loggedIn);
+    expect(user.provider, AuthProviderType.facebook);
+    expect(user.profile.name, "Open Graph Test User");
+  }, skip: "Manual test");
+
+  baasTest('Facebook credentials - invalid or expired token', (configuration) async {
+    final app = App(configuration);
+    final accessToken = 'invalid or expired token';
+    final credentials = Credentials.facebook(accessToken);
+    expect(() async => await app.logIn(credentials), throws<RealmException>("error fetching info from OAuth2 provider"));
+  });
 }