Add google authentication

Core.Thalos.BFF.Api/Services/IGoogleAuthHelper.cs

@@ -0,0 +1,37 @@
+using Google.Apis.Auth.OAuth2;
+using Google.Apis.Oauth2.v2;
+
+namespace Core.Thalos.BFF.Api.Services
+{
+    public interface IGoogleAuthHelper
+    {
+        string[] GetScopes();
+        string ScopeToString();
+        ClientSecrets GetClientSecrets();
+    }
+
+    public class GoogleAuthHelperService(IConfiguration config) : IGoogleAuthHelper
+    {
+        public ClientSecrets GetClientSecrets()
+        {
+            string clientId = config["Authentication:Google:ClientId"]!;
+            string clientSecret = config["Authentication:Google:ClientSecret"]!;
+
+            return new() { ClientId = clientId, ClientSecret = clientSecret };
+        }
+
+        public string[] GetScopes()
+        {
+            var scopes = new[]
+            {
+                Oauth2Service.Scope.Openid,
+                Oauth2Service.Scope.UserinfoEmail,
+                Oauth2Service.Scope.UserinfoProfile
+            };
+
+            return scopes;
+        }
+
+        public string ScopeToString() => string.Join(", ", GetScopes());
+    }
+}