public async Task <byte[]> ExecuteAsync(HttpContext context, IWebOptimizerOptions options)
{
var env = (IHostingEnvironment)context.RequestServices.GetService(typeof(IHostingEnvironment));
var config = new AssetContext(context, this, options);
IEnumerable <string> files = ExpandGlobs(this, env);
DateTime lastModified = DateTime.MinValue;
// Read file content into memory
foreach (string file in files)
{
if (!config.Content.ContainsKey(file))
{
DateTime dateChanged = await LoadFileContentAsync(this.GetFileProvider(env), config, file);
if (dateChanged > lastModified)
{
lastModified = dateChanged;
}
}
}
if (lastModified != DateTime.MinValue)
{
context.Response.Headers[HeaderNames.LastModified] = lastModified.ToString("R");
}
// Attach the processors
foreach (IProcessor processor in Processors)
{
await processor.ExecuteAsync(config).ConfigureAwait(false);
}
return(config.Content.FirstOrDefault().Value);
}
private static async Task <DateTime> LoadFileContentAsync(IFileProvider fileProvider, AssetContext config, string sourceFile)
{
IFileInfo file = fileProvider.GetFileInfo(sourceFile);
using (Stream fs = File.OpenRead(file.PhysicalPath))
{
byte[] bytes = await fs.AsBytesAsync();
if (bytes.Length > 2 && bytes[0] == 0xEF && bytes[1] == 0xBB && bytes[2] == 0xBF)
{
bytes = bytes.Skip(3).ToArray();
}
config.Content.Add(sourceFile, bytes);
}
return(file.LastModified.UtcDateTime);
}