private async Task ExecuteRules(HttpContext context, IContentAbstraction contentAbstraction, ModificationContext modificationContext, IEnumerable <JavascriptModifier> modifiers)
{
using (var jsEngine = _serviceProvider.GetService <IJSEngine>())
{
jsEngine.Start();
await contentAbstraction.Register(modificationContext, jsEngine);
foreach (var modifier in modifiers)
{
try
{
bool executeModificationFunction = string.IsNullOrEmpty(modifier.DiscoveryFunction) || jsEngine.Evaluate <bool>(modifier.DiscoveryFunction) ? true : false;
if (executeModificationFunction)
{
jsEngine.Execute(modifier.ModificationFunction);
}
}
catch (Exception ex)
{
_logger.LogError($"Rule Exception: {ex}");
}
}
}
}
private async Task UpdateResponseStream(HttpContext context, IContentAbstraction contentAbstraction, Stream originalResponseBodyStream)
{
var finalResponseStream = await contentAbstraction.ReadAsStream();
context.Response.Headers.Remove(HeaderNames.ContentLength);
context.Response.ContentLength = finalResponseStream.Length;
await finalResponseStream.CopyToAsync(originalResponseBodyStream);
}
private async Task UpdateRequestStream(HttpContext context, IContentAbstraction contentAbstraction)
{
var finalOutputStream = await contentAbstraction.ReadAsStream();
finalOutputStream.Position = 0;
context.Request.Body = finalOutputStream;
context.Request.Headers.Remove(HeaderNames.ContentLength);
context.Request.ContentLength = finalOutputStream.Length;
}
