From dd5da99f77e6b38dd789e94314298c91aab949ea Mon Sep 17 00:00:00 2001
From: Josh Deck <joshdeck@keymotive.net>
Date: Thu, 8 Aug 2024 13:17:41 -0400
Subject: [PATCH] Facebook login flow

---
 TSC2/Components/CSharp/Credentials.cs      |   3 +
 TSC2/Components/Layout/MainLayout.razor    |   7 +-
 TSC2/Components/Layout/MainLayout.razor.cs |  17 ++-
 TSC2/Components/Pages/FacebookSignIn.razor | 116 +++++++++++++++++++++
 TSC2/Components/Pages/GoogleSignIn.razor   |   6 +-
 TSC2/Components/Pages/Home.razor           |   2 +-
 TSC2/Components/Pages/Home.razor.cs        |   7 +-
 7 files changed, 148 insertions(+), 10 deletions(-)
 create mode 100644 TSC2/Components/Pages/FacebookSignIn.razor

diff --git a/TSC2/Components/CSharp/Credentials.cs b/TSC2/Components/CSharp/Credentials.cs
index 1e54f08..e5a9312 100644
--- a/TSC2/Components/CSharp/Credentials.cs
+++ b/TSC2/Components/CSharp/Credentials.cs
@@ -4,5 +4,8 @@
     {
         public static string GoogleClientId = "656434530552-03u6d8t2lpf1phuq6qkq0getfh9d7di9.apps.googleusercontent.com";
         public static string GoogleClientSecret = "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";
+
+        public static string FacebookAppId = "791426466201326";
+        public static string FacebookClientSecret = "13ae28aac6727b898ba712eb78ab0f24";
     }
 }
diff --git a/TSC2/Components/Layout/MainLayout.razor b/TSC2/Components/Layout/MainLayout.razor
index 0a64380..a8eef1b 100644
--- a/TSC2/Components/Layout/MainLayout.razor
+++ b/TSC2/Components/Layout/MainLayout.razor
@@ -1,5 +1,7 @@
 @inherits LayoutComponentBase
 
+@inject NavigationManager _navigationManager
+
 <TelerikRootComponent>
     <!-- Header
     ============================================= -->
@@ -14,11 +16,14 @@
                 <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>
+                        <a class="menu-link text-nowrap" style="font-size:medium" href="https://accounts.google.com/o/oauth2/v2/auth?access_type=online&client_id=@GoogleClientId&redirect_uri=@GoogleRedirect&response_type=code&scope=profile email&prompt=consent"><div>Sign in with Google</div></a>
+                        <a class="menu-link text-nowrap" style="font-size:medium" href="https://www.facebook.com/v20.0/dialog/oauth?client_id=@FacebookId&redirect_uri=@FacebookRedirect&scope="><div>Sign in with Facebook</div></a>
                     }
                     else
                     {
                         <a class="menu-link text-nowrap" style="font-size:medium"><div>@Greeting</div></a>
+
+                        <a class="menu-link text-nowrap" href="#" style="font-size:medium" @onclick="SignOut"><div>Sign Out</div></a>
                     }
 
                     <a href="demo-car.html">
diff --git a/TSC2/Components/Layout/MainLayout.razor.cs b/TSC2/Components/Layout/MainLayout.razor.cs
index 3a370d4..b1352b7 100644
--- a/TSC2/Components/Layout/MainLayout.razor.cs
+++ b/TSC2/Components/Layout/MainLayout.razor.cs
@@ -3,9 +3,11 @@
     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 string GoogleClientId = CSharp.Credentials.GoogleClientId;
+        public string GoogleClientSecret = CSharp.Credentials.GoogleClientSecret;
+        public string FacebookId = CSharp.Credentials.FacebookAppId;
+        public static string GoogleRedirect = "https://localhost:7282/signin-google";
+        public static string FacebookRedirect = "https://localhost:7282/signin-facebook";
         public static Dictionary<string, string> Session = new Dictionary<string, string>();
 
 
@@ -21,5 +23,14 @@
             Greeting = "Hello, " + Session["name"];
             Console.Out.WriteLine("Updated greeting");
         }
+
+
+
+        public void SignOut()
+        {
+            Session = new Dictionary<string, string>();
+            _navigationManager.NavigateTo("/");
+            Console.WriteLine("Signed out");
+        }
     }
 }
diff --git a/TSC2/Components/Pages/FacebookSignIn.razor b/TSC2/Components/Pages/FacebookSignIn.razor
new file mode 100644
index 0000000..95d864e
--- /dev/null
+++ b/TSC2/Components/Pages/FacebookSignIn.razor
@@ -0,0 +1,116 @@
+@using System.Net.Http;
+@using System.Text.Json;
+@using TSC2.Components.Layout;
+
+@page "/signin-facebook"
+
+@inject NavigationManager _navigationManager
+
+@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.FacebookAppId;
+        dct["redirect_uri"] = TSC2.Components.Layout.MainLayout.FacebookRedirect;        
+        dct["client_secret"] = TSC2.Components.CSharp.Credentials.FacebookClientSecret;    
+        dct["code"] = code;
+
+        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.GetAsync(string.Format("https://graph.facebook.com/v20.0/oauth/access_token?client_id={0}&redirect_uri={1}&client_secret={2}&code={3}", dct["client_id"], dct["redirect_uri"], dct["client_secret"], dct["code"]));
+                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())
+            {
+                var id_json = await client.GetStringAsync("https://graph.facebook.com/me?fields=id&access_token=" + tokenResponse.access_token);
+                FacebookAuthResponse id_response = JsonSerializer.Deserialize<FacebookAuthResponse>(id_json);
+
+                Console.WriteLine("ID: " + id_response.id);
+
+                // Configure the request
+                List<KeyValuePair<string, string>> requestData = new List<KeyValuePair<string, string>>();
+                requestData.Add(new KeyValuePair<string, string>("access_token", tokenResponse.access_token));
+                var request = new HttpRequestMessage
+                {
+                    Method = HttpMethod.Get,
+                    RequestUri = new Uri("https://graph.facebook.com/me?access_token=" + tokenResponse.access_token),
+                    Content = new FormUrlEncodedContent(requestData)
+                };
+
+                // Send the request
+                var profile_task = await client.SendAsync(request);
+                profile_json = await profile_task.Content.ReadAsStringAsync();
+            }
+            FacebookProfileResponse profileResponse = JsonSerializer.Deserialize<FacebookProfileResponse>(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("name", profileResponse.name);
+                MainLayout.UpdateGreeting();
+                Console.WriteLine("Signed in successfully. (FB)");
+            }
+
+            _navigationManager.NavigateTo("/");
+        }
+        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 FacebookAuthResponse
+    {
+        public string id { get; set; }
+    }
+
+    public class FacebookProfileResponse
+    {
+        public string name { get; set; }
+        public string first_name { get; set; }
+        public string last_name { get; set; }
+        public string id { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/TSC2/Components/Pages/GoogleSignIn.razor b/TSC2/Components/Pages/GoogleSignIn.razor
index 6fab41f..579eae3 100644
--- a/TSC2/Components/Pages/GoogleSignIn.razor
+++ b/TSC2/Components/Pages/GoogleSignIn.razor
@@ -4,7 +4,8 @@
 
 @page "/signin-google"
 
-<h1>This is Google Page</h1>
+@inject NavigationManager _navigationManager
+
 @code {
 
     [Parameter][SupplyParameterFromQuery] public string? code { get; set; }
@@ -23,7 +24,7 @@
         dct["client_secret"] = TSC2.Components.CSharp.Credentials.GoogleClientSecret;
         dct["code"] = code;
         dct["grant_type"] = "authorization_code";
-        dct["redirect_uri"] = TSC2.Components.Layout.MainLayout.Redirect;   
+        dct["redirect_uri"] = TSC2.Components.Layout.MainLayout.GoogleRedirect;   
         try
         {
             string auth_json = "";
@@ -58,6 +59,7 @@
                 Console.WriteLine("Signed in successfully.");
             }
             
+            _navigationManager.NavigateTo("/");
         }
         catch (Exception ex)
         {
diff --git a/TSC2/Components/Pages/Home.razor b/TSC2/Components/Pages/Home.razor
index 521ec5c..c9d10b6 100644
--- a/TSC2/Components/Pages/Home.razor
+++ b/TSC2/Components/Pages/Home.razor
@@ -165,7 +165,7 @@
 			<div class="slider-inner">
 				<div class="row align-items-stretch flex-md-row-reverse mx-0">
 					<div class="col-md-8 col-sm-12 px-0 min-vh-40">
-						<TelerikMap @ref="@MapRef" Zoom="@Zoom" Height="@MapHeight" Center="[40.68, 74.04]" OnMarkerClick="@OnMarkerClick">
+						<TelerikMap @ref="@MapRef" Zoom="@Zoom" Height="@MapHeight" Center="@Center" OnMarkerClick="@OnMarkerClick">
 							<MapLayers>
 								<MapLayer Type="@MapLayersType.Tile"
 											Attribution="@Attribution"
diff --git a/TSC2/Components/Pages/Home.razor.cs b/TSC2/Components/Pages/Home.razor.cs
index f3da7df..a7cc514 100644
--- a/TSC2/Components/Pages/Home.razor.cs
+++ b/TSC2/Components/Pages/Home.razor.cs
@@ -32,13 +32,14 @@ namespace TSC2.Components.Pages
 			MapRef?.Refresh();
             Console.WriteLine("Initial refresh");
 
-			Center = [40.68, 74.04];
-				
+			Center = [42.4649, -83.3684];
+			
 			Zoom = 11;
 			Console.WriteLine("Map initialized @ " + Center[0] + " " + Center[1]);
 
 			InitializeMapMarkers(Center);
-			MapRef?.Refresh();
+            MapRef?.Refresh();
+
 			Console.WriteLine("IsVisible: " + (MapRef == null ? "false" : "true"));		   
 		}