TheShopCritics2/TSC2/Components/Pages/FacebookSignIn.razor

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@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; }
}
}