Login with refresh token

[researcher]

Hello, is there any way I can login with refresh token with Steam Web API-s? I found how to log in with account name, password and guard code here https://steamwebapi.azurewebsites.net/, but I can't see how can I log in with refresh token alone. I now that steam-user does this with Steam network, but I'm interested in Steam Web solution. Thanks.

[Dr. McKay]

You can do this with steam-session.

[researcher]

Thanks for the reference. I want to do it with the simple http request and came to this:

fetch(
        'https://api.steampowered.com/IAuthenticationService/GenerateAccessTokenForApp/v1/',
            {
                method: 'POST',
                headers: {
                    "Content-Type": "application/x-www-form-urlencoded",
                },
                body: new URLSearchParams({
                    refresh_token: refreshToken,
                    steamid: id,
                }).toString()
            }
    )

refreshToken variable holds normal refresh token, like the one received in steam-user 'refreshToken' event. id variable holds 64-bit Steam ID.

But I'm getting empty result:

{"response":{}}

And in the header I'm getting 'x-eresult': '63' when I call fetch for the first time, but 'x-eresult': '15' when I call it for the second time (with the same refresh token). 

Thanks.

[Dr. McKay]

I don't really have the time or capacity to do one-on-one coaching for reimplementing the Steam protocols yourself. I'd suggest checking the existing code and trying to copy it as exactly as possible.

[researcher]

Sorry to bother you, but my question is related to exactly this one endpoint, not the whole Steam protocol. I checked github and copied exactly the same, and among those that work I could not find any that uses query parameters, they are all based on protocol buffers. I was able to figure out how to create the entire authentication flow based on guard code (with query parameters). But this one endpoint looks problematic.

Happy new year.

Thanks.