Net Core API gateway. An API gateway might be a very useful part in a service oriented architecture using the micro services approach. In such an architecture you might have a lot of different APIs, each responsible only for one specific thing. An API gateway would do exactly this for the consumers and many more of course so that they would need to send only one request to one endpoint and the gateway would aggregate the needed response.
Building an API gateway from scratch is not that trivial. There are a lot of things that you need to take into consideration like authentication and authorization, service discovery, response aggregation, throttling and so on.Microservice Authentication and Authorization - Nic Jackson
Naturally when I started to work on this I was looking for a library that would help me in a certain way to not loose track of important aspects. So I thought I might want to share my thoughts about Ocelot, since I think this information might be useful for other developers that will see themselves facing a similar task. Ocleot is an open source product aimed at people using. Ocelot is fast, scalable and provides mostly all features you consider as mandatory when building an API gateway.
NET Core only and is currently built to netcoreapp2. They also have a very detailed documentation. What I want to do is to focus on different requirements I had and how I managed to implement them with Ocelot. Of course you can have a lot of such paths configured. If you want to authenticate using JWT tokens from a provider like Auth0 you just need to add authentication to ConfigureServices with the desired authentication options.
Which is cool! Regarding authorization, Ocelot supports claim based authorization. This occurs, of course after the authentication process. And you can easily configure authorization also via configuration.
In my case I needed to find a way to perform some logic on each incoming request that would, in some cases, also modify the upstream path, to make sure that the request is re-routed to the appropriate downstream path.
I'm currently using Ocelot as Api Gateway for a micro-services architecture. I have some authenticated reroutes and to be able to use it I declared a authentication Middleware like this :. I wanted to run some custom validation to implement refresh token workflow, to do so I implemented the preAuthentication Middleware to make so tests :. From what I understood, when I make an api Call, the preAuthenticate Middleware would be called, and with next.
Invoke my Authentication middleware would be called. The newly generated token in my PreAuthentication middleware is a valid one, but my authentication middleware throws an expiredToken exception even tho he's not. Therefore I think the authentication Middleware is run against the first JWT when the new one has not been yet set to the Authorization Header.
Is it the attended behaviour? Or maybe I did not understood correctly the middleware in Ocelot? Learn more. Ocelot Asp.
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Asked 1 month ago. Active 1 month ago. Viewed 52 times. AuthenticationScheme; x. GetBytes token. TryGetValues "Authorization", out header ; if header. ValidateExpirationToken header. GenerateToken credentials. Item1, credentials.
Part Two - Building API Gateway Using Ocelot In ASP.NET Core - Authentication
Item2 ; ctx. Remove "Authorization" ; ctx. Add "Authorization", token ; await next. Anyway, some help would be much appreciated! Have a good day, Lio. Active Oldest Votes. Sign up or log in Sign up using Google.Users must register authentication services in their Startup.
In this example TestKey is the scheme that this provider has been registered with. We then map this to a ReRoute in the configuration e.
AuthenticationProviderKey and check that there is an Authentication provider registered with the given key. If a ReRoute is authenticated Ocelot will invoke whatever scheme is associated with it while executing the authentication middleware. If the request fails authentication Ocelot returns a http status code If you want to authenticate using JWT tokens maybe from a provider like Auth0 you can register your authentication middleware as normal e. In order to use IdentityServer bearer tokens, register your IdentityServer services as usual in ConfigureServices with a scheme key.
Issue that contains some code and examples that might help with Okta integration. If you add scopes to AllowedScopes Ocelot will get all the user claims from the token of the type scope and make sure that the user has all of the scopes in the list. Ocelot latest. Both ; o. Wait. AddOcelot configuration.
I am using Ocelot as an API Gateway and use my own authentication middleware, since I need to authenticate the users against our own database. The happy path is working just fine. However, if the user cannot authenticate I can only return internal server error, but I have not idea how to make ocelot return a Learn more.
Asked 1 year, 2 months ago. Active 1 year, 2 months ago. Viewed times. I think this question is kind of trivial, but I cannot find an answer to it: I am using Ocelot as an API Gateway and use my own authentication middleware, since I need to authenticate the users against our own database. Can anyone help me? KaffeeKaethe KaffeeKaethe 1 1 gold badge 3 3 silver badges 7 7 bronze badges. Active Oldest Votes.
I only get the status code, but no body message. I want show the message to client. How to do so?
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.This article is the fourth in my Ocelot series, Authentication and Authorization.
In the previous series of articles, our downstream service interfaces are open, without any authentication. Anyone can call them at will as long as they know the calling method of the interface. Therefore, it is easy to cause information leakage or service attack. Just like before I want to find Willing, I have to register with HR department and get my own work card.
Then I take my work card to Willing, show my identity as a company employee, and have the right to ask him to help me complete a task. This paper integrates A. This is a series of articles about Ocelot. I am not going to go into details about Identity Server 4 for the time being.
In this article, I also use Identity Server 4's simplest Client authentication mode. Identity Server 4 has many authentication modes, including user password, client and so on.
Ocelot-Authentication and Authorization
I just need to implement the authentication process of Identity Server 4, so I choose the simplest client mode. First, let's look at how the system uses Identity Server 4 for authentication when there is no Ocelot gateway. Clients need to first think of Identity Server to request authentication, get a Token, and then take the Token to the downstream service to make a request. ApiResources is an array type that represents a list of all downstream services managed by Identity Server.
Configuration is complete. Because we need to use post mode, and add authentication information to the body of authentication request, so I use this method here. Postman Tool completion. In this way, the simplest Identity Server service is configured. Of course, I just used Debug mode to quickly verify the success of Identity Server service.
I will deploy Identity Server service to port AccessTokenValidation for installation directly, or execute the following command line through PowerShell built in VS. Based on the previous configuration, we add a downstream service API that requires authorization Note the addition of the attribute [Authorize] Because I'm just demonstrating the authentication process of Identity Server here, I just add this attribute to one of the API interfaces.
If there are other interfaces that need the whole authentication, I need to add this attribute to the other interfaces. If all the interfaces of this Controller need Identity Server authentication, I add this attribute directly before the class name.
Then we add the resulting Token to the downstream service request in Bearer fashion, so that we can get the right result. Maybe some friends will be a little confused here. In Postman, we add this Token in Authorization, but how do we add Token in our actual call?
In fact, friends familiar with Postman may know what's going on. Postman lists Authorization separately to make it easier for us to fill in Token information in the process of using it. In fact, it will eventually be added to the request header.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Ocelot support to custom authen? I try to add my custom authen to ocelot but can't work. This error. Please can you upload your source code so I can have a closer look? TomPallister please guide to setting authentication in program. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. New issue. Jump to bottom. Labels question. Copy link Quote reply. This comment has been minimized. Sign in to view. TomPallister added the question label Jul 2, Generic ; using System. IO ; using System. Linq ; using System. Tasks ; using Microsoft. AspNetCore ; using Microsoft.The reference microservice application eShopOnContainers is currently using features provided by Envoy to implement the API Gateway instead of the earlier referenced Ocelot.
We made this design choice because of Envoy's built-in support for the WebSocket protocol, required by the new gRPC inter-service communications implemented in eShopOnContainers. However, we've retained this section in the guide so you can consider Ocelot as a simple, capable, and lightweight API Gateway suitable for production-grade scenarios.
That diagram shows how the whole application is deployed into a single Docker host or development PC with "Docker for Windows" or "Docker for Mac". However, deploying into any orchestrator would be similar, but any container in the diagram could be scaled out in the orchestrator. In addition, the infrastructure assets such as databases, cache, and message brokers should be offloaded from the orchestrator and deployed into high available systems for infrastructure, like Azure SQL Database, Azure Cosmos DB, Azure Redis, Azure Service Bus, or any HA clustering solution on-premises.
As you can also notice in the diagram, having several API Gateways allows multiple development teams to be autonomous in this case Marketing features vs. Shopping features when developing and deploying their microservices plus their own related API Gateways. If you had a single monolithic API Gateway that would mean a single point to be updated by several development teams, which could couple all the microservices with a single part of the application.
Going much further in the design, sometimes a fine-grained API Gateway can also be limited to a single business microservice depending on the chosen architecture.
Ocelot-Authentication and Authorization
Having the API Gateway's boundaries dictated by the business or domain will help you to get a better design. For instance, fine granularity in the API Gateway tier can be especially useful for more advanced composite UI applications that are based on microservices, because the concept of a fine-grained API Gateway is similar to a UI composition service. We delve into more details in the previous section Creating composite UI based on microservices.
As key takeaway, for many medium- and large-size applications, using a custom-built API Gateway product is usually a good approach, but not as a single monolithic aggregator or unique central custom API Gateway unless that API Gateway allows multiple independent configuration areas for the several development teams creating autonomous microservices.
As an example, eShopOnContainers has around six internal microservice-types that have to be published through the API Gateways, as shown in the following image. Figure About the Identity service, in the design it's left out of the API Gateway routing because it's the only cross-cutting concern in the system, although with Ocelot it's also possible to include it as part of the rerouting lists.
All those services are currently implemented as ASP. Let's focus on one of the microservices like the Catalog microservice code. You can see that the Catalog microservice is a typical ASP. The HTTP request will end up running that kind of C code accessing the microservice database and any additional required action. Regarding the microservice URL, when the containers are deployed in your local development PC local Docker hosteach microservice's container has always an internal port usually port 80 specified in its dockerfile, as in the following dockerfile:.
The port 80 shown in the code is internal within the Docker host, so it can't be reached by client apps. Client apps can access only the external ports if any published when deploying with docker-compose.