Add Stripe donation flow

2026-07-19 22:26:33 -05:00
parent f12904bf73
commit dec5e74aa7
30 changed files with 1053 additions and 1 deletions
@@ -0,0 +1,74 @@
+using MongoDB.Driver;
+using QuestionsApi.Models;
+
+namespace QuestionsApi.Services;
+
+public sealed class DonationStore
+{
+    private readonly IMongoCollection<Donation> _donations;
+
+    public DonationStore(MongoDatabaseProvider mongo)
+    {
+        _donations = mongo.Database.GetCollection<Donation>("Donations");
+        _donations.Indexes.CreateMany([
+            new CreateIndexModel<Donation>(Builders<Donation>.IndexKeys.Ascending(value => value.UserId).Descending(value => value.CreatedUtc)),
+            new CreateIndexModel<Donation>(Builders<Donation>.IndexKeys.Ascending(value => value.StripeCheckoutSessionId),
+                new CreateIndexOptions<Donation>
+                {
+                    Unique = true,
+                    PartialFilterExpression = Builders<Donation>.Filter.Type(value => value.StripeCheckoutSessionId, MongoDB.Bson.BsonType.String)
+                }),
+            new CreateIndexModel<Donation>(Builders<Donation>.IndexKeys.Ascending(value => value.Status).Descending(value => value.CreatedUtc))
+        ]);
+    }
+
+    public async Task<Donation> CreateAsync(string userId, long amountCents)
+    {
+        var donation = new Donation { UserId = userId, AmountCents = amountCents };
+        await _donations.InsertOneAsync(donation);
+        return donation;
+    }
+
+    public async Task<Donation?> GetOwnedAsync(string id, string userId) =>
+        await _donations.Find(value => value.Id == id && value.UserId == userId).FirstOrDefaultAsync();
+
+    public async Task AttachCheckoutSessionAsync(string id, string sessionId) =>
+        await _donations.UpdateOneAsync(
+            value => value.Id == id && value.Status == DonationStatus.Pending,
+            Builders<Donation>.Update.Set(value => value.StripeCheckoutSessionId, sessionId).Set(value => value.UpdatedUtc, DateTime.UtcNow));
+
+    public async Task MarkCheckoutCreationFailedAsync(string id, string failureCode) =>
+        await _donations.UpdateOneAsync(
+            value => value.Id == id && value.Status == DonationStatus.Pending,
+            Builders<Donation>.Update.Set(value => value.Status, DonationStatus.Failed)
+                .Set(value => value.FailureCode, failureCode).Set(value => value.UpdatedUtc, DateTime.UtcNow));
+
+    public async Task<bool> ApplyStripeStatusAsync(
+        string id,
+        string sessionId,
+        long amountCents,
+        string currency,
+        string status,
+        string paymentIntentId,
+        string eventId)
+    {
+        if (string.IsNullOrWhiteSpace(id) || string.IsNullOrWhiteSpace(sessionId)) return false;
+        var filter = Builders<Donation>.Filter.Eq(value => value.Id, id)
+            & Builders<Donation>.Filter.Eq(value => value.AmountCents, amountCents)
+            & Builders<Donation>.Filter.Eq(value => value.Currency, currency.ToLowerInvariant())
+            & (Builders<Donation>.Filter.Eq(value => value.StripeCheckoutSessionId, sessionId)
+                | Builders<Donation>.Filter.Eq(value => value.StripeCheckoutSessionId, null));
+
+        if (status != DonationStatus.Paid)
+            filter &= Builders<Donation>.Filter.Eq(value => value.Status, DonationStatus.Pending);
+
+        var now = DateTime.UtcNow;
+        var update = Builders<Donation>.Update.Set(value => value.Status, status)
+            .Set(value => value.StripeCheckoutSessionId, sessionId)
+            .Set(value => value.StripePaymentIntentId, paymentIntentId)
+            .Set(value => value.LastStripeEventId, eventId)
+            .Set(value => value.UpdatedUtc, now);
+        if (status == DonationStatus.Paid) update = update.Set(value => value.PaidUtc, now);
+        return (await _donations.UpdateOneAsync(filter, update)).ModifiedCount > 0;
+    }
+}
@@ -0,0 +1,57 @@
+using Stripe;
+using Stripe.Checkout;
+
+namespace QuestionsApi.Services;
+
+public sealed record StripeCheckoutResult(string SessionId, string CheckoutUrl);
+
+public interface IStripeDonationGateway
+{
+    Task<StripeCheckoutResult> CreateCheckoutAsync(string donationId, long amountCents, CancellationToken cancellationToken);
+}
+
+public sealed class StripeDonationGateway(IConfiguration configuration) : IStripeDonationGateway
+{
+    public async Task<StripeCheckoutResult> CreateCheckoutAsync(string donationId, long amountCents, CancellationToken cancellationToken)
+    {
+        var secretKey = configuration["Stripe:SecretKey"];
+        if (string.IsNullOrWhiteSpace(secretKey)) throw new InvalidOperationException("Stripe secret key is not configured.");
+        var successUrl = configuration["Stripe:SuccessUrl"]
+            ?? "https://doctor.ranaze.com/donation-complete.html?session_id={CHECKOUT_SESSION_ID}";
+        var cancelUrl = configuration["Stripe:CancelUrl"] ?? "https://doctor.ranaze.com/donation-canceled.html";
+        var client = new StripeClient(secretKey);
+        var service = new SessionService(client);
+        var metadata = new Dictionary<string, string> { ["donation_id"] = donationId };
+        var session = await service.CreateAsync(new SessionCreateOptions
+        {
+            Mode = "payment",
+            SuccessUrl = successUrl,
+            CancelUrl = cancelUrl,
+            ClientReferenceId = donationId,
+            CustomerCreation = "always",
+            BillingAddressCollection = "auto",
+            Metadata = metadata,
+            PaymentIntentData = new SessionPaymentIntentDataOptions { Metadata = metadata },
+            LineItems =
+            [
+                new SessionLineItemOptions
+                {
+                    Quantity = 1,
+                    PriceData = new SessionLineItemPriceDataOptions
+                    {
+                        Currency = "usd",
+                        UnitAmount = amountCents,
+                        ProductData = new SessionLineItemPriceDataProductDataOptions
+                        {
+                            Name = "Support MedMind",
+                            Description = "One-time contribution supporting MedMind development and medical education content."
+                        }
+                    }
+                }
+            ]
+        }, null, cancellationToken);
+        if (string.IsNullOrWhiteSpace(session.Id) || string.IsNullOrWhiteSpace(session.Url))
+            throw new InvalidOperationException("Stripe did not return a checkout URL.");
+        return new StripeCheckoutResult(session.Id, session.Url);
+    }
+}