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| 1 | +using System.Security.Claims; |
| 2 | +using System.Web; |
| 3 | +using EssentialCSharp.Web.Areas.Identity.Data; |
| 4 | +using EssentialCSharp.Web.Services; |
| 5 | +using Microsoft.AspNetCore.Http.Extensions; |
| 6 | +using Microsoft.AspNetCore.Identity; |
| 7 | + |
| 8 | +namespace EssentialCSharp.Web.Middleware; |
| 9 | + |
| 10 | +public class ReferralMiddleware |
| 11 | +{ |
| 12 | + private readonly RequestDelegate _Next; |
| 13 | + |
| 14 | + public ReferralMiddleware(RequestDelegate next) |
| 15 | + { |
| 16 | + _Next = next; |
| 17 | + } |
| 18 | + |
| 19 | + public async Task InvokeAsync(HttpContext context, IReferralService referralService, UserManager<EssentialCSharpWebUser> userManager) |
| 20 | + { |
| 21 | + // Retrieve current referral Id for processing |
| 22 | + System.Collections.Specialized.NameValueCollection query = HttpUtility.ParseQueryString(context.Request.QueryString.Value!); |
| 23 | + string? referralId = query["rid"]; |
| 24 | + string? userReferralId; |
| 25 | + |
| 26 | + if (context.User is { } claimsUser && claimsUser.Identity is not null && claimsUser.Identity.IsAuthenticated) |
| 27 | + { |
| 28 | + if (!string.IsNullOrWhiteSpace(referralId)) |
| 29 | + { |
| 30 | + await TrackReferralAsync(referralService, referralId, claimsUser); |
| 31 | + } |
| 32 | + |
| 33 | + // Add the referralId to the request context if it exists on a user |
| 34 | + EssentialCSharpWebUser? user = await userManager.GetUserAsync(claimsUser); |
| 35 | + if (user is not null) |
| 36 | + { |
| 37 | + userReferralId = await referralService.GetReferralIdAsync(user.Id); |
| 38 | + |
| 39 | + if (!string.IsNullOrWhiteSpace(userReferralId) && (string.IsNullOrWhiteSpace(query["rid"]) || query["rid"] != userReferralId)) |
| 40 | + { |
| 41 | + query.Remove("rid"); |
| 42 | + query.Add("rid", userReferralId); |
| 43 | + var builder = new UriBuilder(context.Request.GetEncodedUrl()) |
| 44 | + { |
| 45 | + Query = query.ToString() |
| 46 | + }; |
| 47 | + context.Response.Redirect(builder.ToString()); |
| 48 | + return; |
| 49 | + } |
| 50 | + } |
| 51 | + } |
| 52 | + else |
| 53 | + { |
| 54 | + |
| 55 | + if (!string.IsNullOrWhiteSpace(referralId)) |
| 56 | + { |
| 57 | + await TrackReferralAsync(referralService, referralId, null); |
| 58 | + query.Remove("rid"); |
| 59 | + var builder = new UriBuilder(context.Request.GetEncodedUrl()) |
| 60 | + { |
| 61 | + Query = query.ToString() |
| 62 | + }; |
| 63 | + context.Response.Redirect(builder.ToString()); |
| 64 | + return; |
| 65 | + } |
| 66 | + } |
| 67 | + |
| 68 | + await _Next(context); |
| 69 | + |
| 70 | + static async Task TrackReferralAsync(IReferralService referralService, string? referralId, ClaimsPrincipal? claimsUser) |
| 71 | + { |
| 72 | + if (!string.IsNullOrWhiteSpace(referralId)) |
| 73 | + { |
| 74 | + _ = await referralService.TrackReferralAsync(referralId, claimsUser); |
| 75 | + } |
| 76 | + } |
| 77 | + } |
| 78 | +} |
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