namespace SharepointOnlineIntegration.Middleware { public class ApiKeyMiddleware { private readonly RequestDelegate _next; private const string APIKEY = "XApiKey"; public ApiKeyMiddleware(RequestDelegate next) { _next = next; } public async Task InvokeAsync(HttpContext context) { if (!context.Request.Headers.TryGetValue(APIKEY, out var extractedApiKey)) { context.Response.StatusCode = 401; await context.Response.WriteAsync("Api Key was not provided "); return; } var appSettings = context.RequestServices.GetRequiredService<IConfiguration>(); var apiKey = appSettings.GetValue<string>(APIKEY); if (!apiKey.Equals(extractedApiKey)) { context.Response.StatusCode = 401; await context.Response.WriteAsync("Unauthorized client"); return; } await _next(context); } } }