SteamOid2

<PackageReference Include="SteamOid2" Version="*" />

Library for integrating with Steam's Open-ID provider in .NET or .NET Framework, as described here: https://partner.steamgames.com/doc/features/auth#website.

Available for .NET Framework 4.6.1+, .NET Standard 2.1+, and .NET 5.0+.

Justification

This library is very bare-bones and is meant to support you in implementing your own Steam auth in whatever environment you want. It doesn't provide full authentication, just the helper methods you need to make your own.

Usage

using SteamOid2;
using SteamOid2.API;

// A DI constructor is also available using ILogger and IConfiguration
ISteamOid2Client client = new SteamOid2Client("http://localhost:8001/", "http://localhost:8001/openid/login");

• Redirect user to client.GetLoginUri();

• The user will log in, then a request will be sent to the backend at the callback URI.

• Use client.ParseIdReponse(uri) to see if the returned Status is successful.

• Send a POST request to client.GetAuthorizeUri(uri) to ask Steam to confirm that the Steam ID provided was actually logged in to (from the backend).

• Use client.CheckAuthorizationResponse(response) to check that the response from the POST indicates a valid login session.

• For more detailed information see the 2 available samples. The FullSample contains a dependency-injection example and the BasicSample is just a basic console application.

If you're seeing Error when you try to log in from Steam, make sure the realm domain name is the same as the callback domain name.

Sample implementation with a console application and HttpListener

https://github.com/UncreatedStaff/SteamOid2/blob/master/SteamOid2.FullSample/LoginHost.cs

Generating a Strong Name Key/Pair

SteamOid2.dll has a strong name, which means you may want to generate your own to recompile it.

Create a .snk file. This file or its contents should not be shared.

Developer Powershell > cd "Location outside of repository"
Developer Powershell > sn -k SteamOid2.dll.snk
Developer Powershell > sn -p SteamOid2.dll.snk SteamOid2.dll.publickey

Copy the public key to your fork and replace the existing one if you want.

Set the StrongNameKeyPath property in the .csproj file to the path of the .snk file.

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