ShareGuard.Web/Api.cs


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namespace ShareGuard.Web;

public static class Api
{
    private const string TemplateFilePath = "./wg-quick-template.txt";

    public static async Task Redeem(HttpContext context)
    {
        await using var db = new Database();
        var link = db.Links.FirstOrDefault(link => link.Token == context.Request.RouteValues["token"]!.ToString()
                                                   && link.PeerPublicKey == null);
        if (link == null)
        {
            context.Response.StatusCode = StatusCodes.Status403Forbidden;
            await context.Response.WriteAsync("Invalid token.");
            return;
        }

        var form = await context.Request.ReadFormAsync();
        var peerPublicKey = form["PublicKey"];
        if (peerPublicKey.Count < 1)
        {
            context.Response.StatusCode = StatusCodes.Status400BadRequest;
            await context.Response.WriteAsync("Bad request.");
            return;
        }

        link.PeerPublicKey = peerPublicKey[0];

        if (!File.Exists(TemplateFilePath))
        {
            context.Response.StatusCode = StatusCodes.Status204NoContent;
            await context.Response.WriteAsync("Template is not set yet.");
            return;
        }

        db.SaveChanges();
        await context.Response.WriteAsync(File.ReadAllText(TemplateFilePath).Replace("{ip}", link.IpAddress));
    }
}