Building HTTP APIs with ASP.NET Core

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The document discusses building lightweight HTTP APIs with ASP.NET Core, emphasizing the use of minimal frameworks and MVC for complex backends. It covers topics such as security with JSON web tokens, documentation standards like Swagger, and various API versioning approaches. Additionally, it notes tools and packages for versioning and API generation, highlighting that it serves as a guide for best practices in creating efficient APIs.

Software

#td17ch
Building HTTP APIs with
ASP.NET Core
Filip Wojcieszyn
Tech Lead CloudServices, Sonova

Before ASP.NET Core
 HTTP Handlers
 ASMX
 WCF Web Http | WCF REST Starter Kit
 ASP.NET MVC
 WCF Web API | ASP.NET Web API

Agenda
Plan for today
 Lightweight HTTP APIs
 Security
 Documentation
 Versioning
 Demos
https://github.com/filipw/aspnetcore-api-samples

Source: https://ptrthomas.wordpress.com/2006/06/06/java-call-stack-from-http-upto-jdbc-as-a-picture/

Lightweight APIs with ASP.NET Core
Prefer the IRouter extensions
Super lightweight - modeled after other platforms - e.g. Node, Go, Swift
Use MVC for more complex backends
Don’t unnecessarily rely on the full framework
When using MVC, pick and choose pieces you
need
AddMvcCore() method allows you to add only most basic framework services

Super
lightweight
Whole API in single C# file
No MVC
Minimal footprint

HTTP API Security
Use JSON Web Tokens (JWT)
IdentityServer4 is the most popular OpenID Connect and OAuth 2.0 framework for
ASP.NET/ASP.NET Core
Tokens can be issued from an embedded server
too
API could act both as identity and resource server at the same time
ASP.NET Core introduces “Authorization Policies”
Centralized way to define required claim validations

HTTP API Documentation
Swagger has become a de facto standard
Defines swagger.json descriptor file, that allows easy client generation
Swashbuckle package for ASP.NET Core
Can generate swagger.json for your MVC-based HTTP API
ASP.NET Core MVC exposes IApiExplorer service
In case you need to manually traverse the endpoints

HTTP API Versioning Approaches
URI-based
GET /v1/contacts
GET /contacts?v=1
Header-based
GET /contacts
Version: 2
Media type-based
GET /contacts
Accept: application/vnd.contact-v2+json

HTTP API Versioning packages
Microsoft.AspNetCore.Mvc.Versioning
A Microsoft versioning package for ASP.NET Core MVC
WebApiContrib.Core.Versioning
A community versioning package for ASP.NET Core MVC

© 2017 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and
Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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1. #td17ch Building HTTP APIs with ASP.NET Core Filip Wojcieszyn Tech Lead CloudServices, Sonova

2. @filip_woj strathweb.com sonova.com

3. Before ASP.NET Core  HTTP Handlers  ASMX  WCF Web Http | WCF REST Starter Kit  ASP.NET MVC  WCF Web API | ASP.NET Web API

5. Agenda Plan for today  Lightweight HTTP APIs  Security  Documentation  Versioning  Demos https://github.com/filipw/aspnetcore-api-samples

6. Lightweight HTTP APIs

7. What would Martin Fowler do?

10. Source: https://ptrthomas.wordpress.com/2006/06/06/java-call-stack-from-http-upto-jdbc-as-a-picture/

11. Lightweight APIs with ASP.NET Core Prefer the IRouter extensions Super lightweight - modeled after other platforms - e.g. Node, Go, Swift Use MVC for more complex backends Don’t unnecessarily rely on the full framework When using MVC, pick and choose pieces you need AddMvcCore() method allows you to add only most basic framework services

12. Super lightweight Whole API in single C# file No MVC Minimal footprint

13. How To Not Set Up an MVC-based API

14. How To Set Up an MVC API

15. Security

16. HTTP API Security Use JSON Web Tokens (JWT) IdentityServer4 is the most popular OpenID Connect and OAuth 2.0 framework for ASP.NET/ASP.NET Core Tokens can be issued from an embedded server too API could act both as identity and resource server at the same time ASP.NET Core introduces “Authorization Policies” Centralized way to define required claim validations

18. Securing an API (embedded server)

19. Documentation

20. HTTP API Documentation Swagger has become a de facto standard Defines swagger.json descriptor file, that allows easy client generation Swashbuckle package for ASP.NET Core Can generate swagger.json for your MVC-based HTTP API ASP.NET Core MVC exposes IApiExplorer service In case you need to manually traverse the endpoints

24. Versioning

25. Versioning is difficult

26. HTTP API Versioning Approaches URI-based GET /v1/contacts GET /contacts?v=1 Header-based GET /contacts Version: 2 Media type-based GET /contacts Accept: application/vnd.contact-v2+json

27. HTTP API Versioning packages Microsoft.AspNetCore.Mvc.Versioning A Microsoft versioning package for ASP.NET Core MVC WebApiContrib.Core.Versioning A community versioning package for ASP.NET Core MVC

28. © 2017 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

29. © 2017 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Building HTTP APIs with ASP.NET Core

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