public async override Task <IEnumerable <Asset> > TransformAsync(string extension, params Asset[] assets)
{
AutoStream outputStream = new AutoStream(1024 * 64);
foreach (var asset in assets)
{
string seperator = this.GetSeperator(asset);
byte[] seperatorBytes = string.IsNullOrEmpty(seperator) ? Array.Empty <byte>() : Encoding.UTF8.GetBytes(seperator);
await asset.Content.CopyToAsync(outputStream);
if (0 < seperatorBytes.Length)
{
await outputStream.WriteAsync(seperatorBytes, 0, seperatorBytes.Length);
}
}
outputStream.Seek(0, SeekOrigin.Begin);
string hashName = Utilities.GetBaseString(Utilities.CalculateStreamHash(outputStream), Utilities.Base63Alphabet);
outputStream.Seek(0, SeekOrigin.Begin);
return(new[] { new Asset($"{hashName}{extension}", outputStream) });
}
public async IAsyncEnumerable <AnalyticsItem> HandleAsync(HttpRequest request)
{
if (0 == string.Compare(request.Method, HttpMethods.Post))
{
using (Stream inputStream = new AutoStream(32 * 1024))
{
bool hasPopulatedStream = false;
if (request.Headers.TryGetValue(HeaderNames.ContentType, out StringValues contentTypeHeader))
{
if (contentTypeHeader.Any(ct => 0 == string.Compare(ct, AiJsonSerializer.ContentType, StringComparison.OrdinalIgnoreCase)))
{
this.Logger.LogInformation("Analytics Middleware received compressed JSON data.");
using (var zipStream = new GZipStream(request.Body, CompressionMode.Decompress))
{
await zipStream.CopyToAsync(inputStream);
hasPopulatedStream = true;
}
}
}
if (!hasPopulatedStream)
{
await request.Body.CopyToAsync(inputStream);
}
inputStream.Seek(0, SeekOrigin.Begin);
this.Logger.LogInformation("Extracting envelope items from the request body.");
var envelopeItems = await NdJsonSerializer.DeserializeAsync <Envelope>(inputStream, AppInsightsHandler.JsonSerializerSettings);
this.Logger.LogInformation($"Extracted envelope items.");
if (envelopeItems.Any())
{
foreach (var envelopeItem in envelopeItems)
{
if (AnalyticsItemPopulator.TryPopulateItem(envelopeItem, out AnalyticsItem analyticsItem))
{
this.Logger.LogTrace($"Envelope item with data of type '{analyticsItem.Type}' is parsed.");
if (this.Populators.TryGetValue(analyticsItem.Type, out AnalyticsItemPopulator populator))
{
if (populator.TryPopulate(envelopeItem, ref analyticsItem))
{
this.Logger.LogTrace($"Analytics item of type '{analyticsItem.Type}' is populated.");
}
}
else
{
this.Logger.LogWarning($"AppInsights handler received a type of '{analyticsItem.Type}' and doesn't have a populator registered for that type.");
}
if (await this.Validator.ValidateInstrumentationKeyAsync(analyticsItem.InstrumentationKey))
{
yield return(analyticsItem);
}
}
}
}
}
}
}
public async Task InvokeAsync(HttpContext context, RequestDelegate next)
{
this.Logger.LogInformation($"Html response minification is {(this.Options.MinifyHtml ? "Enabled" : "Disabled")}");
if (this.Options.MinifyHtml)
{
Stream originalStream = context.Response.Body;
using (AutoStream autoStream = new AutoStream(this.Options.HtmlBufferSize))
{
bool fallbackToDefault = true;
context.Response.Body = autoStream;
await next.Invoke(context);
autoStream.Seek(0, SeekOrigin.Begin);
if (!string.IsNullOrWhiteSpace(context.Response.ContentType))
{
var contentType = new ContentType(context.Response.ContentType);
if (0 == string.Compare(contentType.MediaType, MediaTypeNames.Text.Html, StringComparison.OrdinalIgnoreCase))
{
using (StreamReader reader = new StreamReader(autoStream, Encoding.UTF8, false, 4096, true))
{
string content = await reader.ReadToEndAsync();
var result = Uglify.Html(content, this.HtmlSettings);
if (result.HasErrors)
{
this.Logger.LogWarning("Html minification has errors. Falling back to no minification.");
foreach (var error in result.Errors)
{
this.Logger.LogWarning(error.ToString());
}
}
if (!(fallbackToDefault = result.HasErrors))
{
context.Response.Body = originalStream;
await context.Response.WriteAsync(result.Code, Encoding.UTF8);
this.Logger.LogInformation($"Html minification succeeded for '{context.Request.Path}'.");
}
}
}
}
if (fallbackToDefault)
{
await autoStream.CopyToAsync(originalStream);
context.Response.Body = originalStream;
}
}
}
else
{
await next.Invoke(context);
}
}