ordercloud-dotnet-catalyst

A foundational library for building OrderCloud middleware, plugins and extensions with .NET. A toolbox of helpers for authentication, performant bulk requests, error handling, jobs, project setup, ect.

See dotnet-catalyst-examples for a starter template of a middleware project that uses this library. Targeted guides are found there.

If you're building solutions for OrderCloud using .NET and find a particular task difficult or tedious, we welcome you to suggest a feature for inclusion in this library.

Features

User Authentication

Use Ordercloud's authentication scheme in your own APIs.

[HttpGet("hello"), OrderCloudUserAuth(ApiRole.Shopper)]
public string SayHello() {
    return $"Hello {UserContext.Username}";  // UserContext is a property on CatalystController
}

Webhook Authentication

Securely receive push notifications of events from the Ordercloud platform.

[HttpPost("webhook"), OrderCloudWebhookAuth]
public object HandleAddressSave([FromBody] WebhookPayloads.Addresses.Save<MyConfigData> payload) {
    ...
}

Listing All Pages

If OrderCloud's limit of 100 records per page is a pain point.

var orders = new OrderCloudClient(...).Orders.ListAllAsync();

Proxying Platform List Calls

Receive list requests to your API with user defined filters, search, paging, and sorting.

[HttpGet("orders"), OrderCloudUserAuth(ApiRole.Shopper)]
public async Task<ListPage<Order>> ListOrders(IListArgs args)
{
    var user = await _oc.Me.GetAsync(UserContext.AccessToken); // get user details
    args.Filters.Add(new ListFilter("FromCompanyID", user.MeUser.Buyer.ID)) // filter using the user's buyer organization ID 
    args.Filters.Add(new ListFilter("LineItemCount", ">5"))
    // list orders from an admin endpoint
    var orders = await _oc.Orders.ListAsync(OrderDirection.Incoming, null, null, null, null, args); // apply list args with an extension version of ListAsync()
    return orders;
}

Caching

Use Redis or LazyCache. Or, define your own implementation of ISimpleCache.

private ISimpleCache _cache;

[HttpGet("thing")]
public Thing GetThing(string thingID) {
    var key = $"thing-{thingID}";
    var timeToLive = TimeSpan.FromMinutes(10);
    var thing = await _cache.GetOrAddAsync(key, timeToLive, () database.GetThing(thingID));
    return thing;
}

[HttpPut("thing")]
public Thing EditThing(string thingID) {
    var key = $"thing-{thingID}";
    await _cache.RemoveAsync(thingID);
    return await database.EditThing(thingID);
}

Throttler

A perfomance helper for multiple async function calls.

var cars = new List<Car>();

var maxConcurency = 20;
var minPause = 100 // ms
var carOwners = await Throttler.RunAsync(cars, minPause, maxConcurency, car => apiClient.GetCarOwner(car.ID);

Error Handling

Handle API errors, including unexpected ones, with a standard JSON response structure. Define your own errors.

public class AgeLimit21Exception : CatalystBaseException
{
    public AgeLimit21Exception() : base("AgeLimit21", 403, "You must be 21 years of age or older to buy this product.") { }
}

....

Require.That(user.xp.Age >= 21, new AgeLimit21Exception());

Model Validation

Take advantage of DataAnnotation attributes to specify validation requirements for your own custom models.

[Required(ErrorMessage = "This field is required, please try again.")]
public string RequiredField { get; set; }

Testing helpers

When writing integration tests that hit an endpoint marked with [OrderCloudUserAuth], you'll need to pass a properly formatted JWT token in the Authorization header, otherwise the call will fail. Fake tokens are a bit tedious to create, so OrderCloud.Catalyst provides a helper:

var token = FakeOrderCloudToken.Create(
    clientID: "my-client-id", 
    roles: new List<string> { "Shopper" },
    expiresUTC: DateTime.UtcNow + TimeSpan.FromHours(1),
    notValidBeforeUTC: DateTime.UtcNow - TimeSpan.FromHours(1)
);
httpClient.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", token);

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