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+.

The .NET Framework target doesn't have any Microsoft.Extensions support.

Usage

using SteamOid2;
using SteamOid2.API;

// A DI constructor is also available using IConfiguration in the .NET and .NET Standard targets.
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.

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.

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.

Sample implementation with a console application and HttpListener

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

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