From 26f24553739a1144936878f5f26be75394729c2d Mon Sep 17 00:00:00 2001
From: Josh Deck <joshdeck@keymotive.net>
Date: Mon, 5 Aug 2024 13:13:29 -0400
Subject: [PATCH] Google authentication

---
 TSC2/Components/CSharp/Credentials.cs      |  8 ++
 TSC2/Components/Layout/MainLayout.razor    | 15 +++-
 TSC2/Components/Layout/MainLayout.razor.cs | 25 ++++++
 TSC2/Components/Pages/GoogleSignIn.razor   | 98 ++++++++++++++++++++++
 TSC2/Program.cs                            |  4 +
 TSC2/TSC2.csproj                           |  1 +
 6 files changed, 149 insertions(+), 2 deletions(-)
 create mode 100644 TSC2/Components/CSharp/Credentials.cs
 create mode 100644 TSC2/Components/Layout/MainLayout.razor.cs
 create mode 100644 TSC2/Components/Pages/GoogleSignIn.razor

diff --git a/TSC2/Components/CSharp/Credentials.cs b/TSC2/Components/CSharp/Credentials.cs
new file mode 100644
index 0000000..1e54f08
--- /dev/null
+++ b/TSC2/Components/CSharp/Credentials.cs
@@ -0,0 +1,8 @@
+namespace TSC2.Components.CSharp
+{
+    public class Credentials
+    {
+        public static string GoogleClientId = "656434530552-03u6d8t2lpf1phuq6qkq0getfh9d7di9.apps.googleusercontent.com";
+        public static string GoogleClientSecret = "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";
+    }
+}
diff --git a/TSC2/Components/Layout/MainLayout.razor b/TSC2/Components/Layout/MainLayout.razor
index f5538e8..0a64380 100644
--- a/TSC2/Components/Layout/MainLayout.razor
+++ b/TSC2/Components/Layout/MainLayout.razor
@@ -8,14 +8,25 @@
         <div class="container-fluid">
             <div class="header-row flex-lg-row-reverse">
 
-                <!-- Logo
+                
+                <!-- Logo and sign-in buttons
                 ============================================= -->
                 <div id="logo" class="me-lg-0 ms-lg-auto">
+                    @if(Session.Count == 0)
+                    {
+                        <a class="menu-link text-nowrap" style="font-size:medium" href="https://accounts.google.com/o/oauth2/v2/auth?access_type=online&client_id=@ClientId&redirect_uri=@Redirect&response_type=code&scope=profile email&prompt=consent"><div>Sign in with Google</div></a>
+                    }
+                    else
+                    {
+                        <a class="menu-link text-nowrap" style="font-size:medium"><div>@Greeting</div></a>
+                    }
+
                     <a href="demo-car.html">
                         <img class="logo-default" srcset="img/logo.jpg, img/logo.jpg@2x.png 2x" src="img/logo.jpg@2x.png" alt="TheShopCritics Logo">
                     </a>
                 </div><!-- #logo end -->
 
+
                 <div class="primary-menu-trigger">
                     <button class="cnvs-hamburger" type="button" title="Open Mobile Menu">
                         <span class="cnvs-hamburger-box"><span class="cnvs-hamburger-inner"></span></span>
@@ -34,7 +45,7 @@
                         <li class="menu-item"><a class="menu-link" href="demo-car-interiors.html"><div>Interiors</div></a></li>
                         <li class="menu-item"><a class="menu-link" href="demo-car-faqs.html"><div>FAQs</div></a></li>
                         <li class="menu-item"><a class="menu-link" href="demo-car-blog.html"><div>Blog</div></a></li>
-                        <li class="menu-item"><a class="menu-link" href="demo-car-contact.html"><div>Contacts</div></a></li>
+                        <li class="menu-item"><a class="menu-link" href="demo-car-contact.html"><div>Contacts</div></a></li>                            
                     </ul>
                 </nav><!-- #primary-menu end -->
 
diff --git a/TSC2/Components/Layout/MainLayout.razor.cs b/TSC2/Components/Layout/MainLayout.razor.cs
new file mode 100644
index 0000000..3a370d4
--- /dev/null
+++ b/TSC2/Components/Layout/MainLayout.razor.cs
@@ -0,0 +1,25 @@
+namespace TSC2.Components.Layout
+{
+    public partial class MainLayout
+    {        
+        public static string Greeting = "Hello, {}";
+        public string ClientId = CSharp.Credentials.GoogleClientId;
+        public string ClientSecret = CSharp.Credentials.GoogleClientSecret;
+        public static string Redirect = "https://localhost:7282/signin-google";
+        public static Dictionary<string, string> Session = new Dictionary<string, string>();
+
+
+
+        public static void UpdateGreeting()
+        {
+            if (Session.Count == 0)
+            {
+                return;
+            }
+
+            // This should only execute if the user is signed in AND is the first render
+            Greeting = "Hello, " + Session["name"];
+            Console.Out.WriteLine("Updated greeting");
+        }
+    }
+}
diff --git a/TSC2/Components/Pages/GoogleSignIn.razor b/TSC2/Components/Pages/GoogleSignIn.razor
new file mode 100644
index 0000000..6fab41f
--- /dev/null
+++ b/TSC2/Components/Pages/GoogleSignIn.razor
@@ -0,0 +1,98 @@
+@using System.Net.Http;
+@using System.Text.Json;
+@using TSC2.Components.Layout;
+
+@page "/signin-google"
+
+<h1>This is Google Page</h1>
+@code {
+
+    [Parameter][SupplyParameterFromQuery] public string? code { get; set; }
+    [Parameter][SupplyParameterFromQuery] public string? scope { get; set; }
+    [Parameter][SupplyParameterFromQuery] public string? authuser { get; set; }
+    [Parameter][SupplyParameterFromQuery] public string? prompt { get; set; }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender) // Executes every page load; run inexpensive rendering code here
+    {
+        if (!firstRender)
+            return;
+
+        var dct = new Dictionary<string, string>();
+
+        dct["client_id"] = TSC2.Components.CSharp.Credentials.GoogleClientId;
+        dct["client_secret"] = TSC2.Components.CSharp.Credentials.GoogleClientSecret;
+        dct["code"] = code;
+        dct["grant_type"] = "authorization_code";
+        dct["redirect_uri"] = TSC2.Components.Layout.MainLayout.Redirect;   
+        try
+        {
+            string auth_json = "";
+            string profile_json = "";
+
+            // Get access token for the auth session
+            using(var client = new HttpClient())
+            using(var content = new FormUrlEncodedContent(dct))
+            {
+                HttpResponseMessage response = await client.PostAsync("https://oauth2.googleapis.com/token", content);
+                auth_json = await response.Content.ReadAsStringAsync();
+            }
+            OAuthTokenResponse tokenResponse = JsonSerializer.Deserialize<OAuthTokenResponse>(auth_json);
+            Console.WriteLine("AUTH: " + auth_json);
+            // Use the access token to access their information; name, email, & token
+            using (var client = new HttpClient())
+            {
+                profile_json = await client.GetStringAsync("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + tokenResponse.access_token);
+                // I think this is the json response?? who knows!
+            }
+            GoogleProfileResponse profileResponse = JsonSerializer.Deserialize<GoogleProfileResponse>(profile_json);
+
+
+            Console.WriteLine("PROFILE: " + profile_json);
+
+            if (MainLayout.Session.Count == 0) // Fpr security, only add to the session if nothing exists in the session.
+            {
+                MainLayout.Session.Add("id", profileResponse.id);
+                MainLayout.Session.Add("email", profileResponse.email);
+                MainLayout.Session.Add("name", profileResponse.name);
+                MainLayout.UpdateGreeting();
+                Console.WriteLine("Signed in successfully.");
+            }
+            
+        }
+        catch (Exception ex)
+        {
+            // Handler
+            Console.WriteLine("ERORR" + ex);
+        }
+
+    }
+
+
+
+    // Data classes to handle the Http responses
+    public class OAuthTokenResponse
+    {
+        public string access_token { get; set; }
+        public int expires_in { get; set; }
+        public string refresh_token { get; set; }
+        public string scope { get; set; }
+        public string token_type { get; set; }
+        public string id_token { get; set; }
+        public string error { get; set; }
+        public string error_description { get; set; }
+
+        public bool IsSuccess => string.IsNullOrEmpty(error);
+    }
+
+    public class GoogleProfileResponse
+    {
+        public string id { get; set; }
+        public string email { get; set; }
+        public string email_verified { get; set; }
+        public string family_name { get; set; }
+        public string given_name { get; set; }
+        public string name { get; set; }
+        public string picture { get; set; }
+        public string profile { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/TSC2/Program.cs b/TSC2/Program.cs
index 366f02d..16e0757 100644
--- a/TSC2/Program.cs
+++ b/TSC2/Program.cs
@@ -9,6 +9,10 @@ builder.Services.AddTelerikBlazor();
 
 var app = builder.Build();
 
+// Note secrets for login auth
+var GoogleClientId = builder.Configuration["Authentication:Google:ClientId"];
+var GoogleClientSecret = builder.Configuration["Authentication:Google:ClientSecret"];
+
 // Configure the HTTP request pipeline.
 if (!app.Environment.IsDevelopment())
 {
diff --git a/TSC2/TSC2.csproj b/TSC2/TSC2.csproj
index 1e0ebba..a4e3442 100644
--- a/TSC2/TSC2.csproj
+++ b/TSC2/TSC2.csproj
@@ -3,6 +3,7 @@
     <TargetFramework>net8.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <UserSecretsId>0a14eb84-bad8-4797-b17f-12714e7c3dc9</UserSecretsId>
   </PropertyGroup>
 
   <ItemGroup>