public GravatarMiddleware(RequestDelegate next, IHostingEnvironment hostingEnv, IOptions <GravatarOptions> options, ILoggerFactory loggerFactory)
{
_options = options.Value;
_fileProvider = _options.FileProvider ?? ResolveFileProvider(hostingEnv);
_next = next;
_defaultGravatarPath = _options.DefaultGravatarPath;
//ensure that the provided default gravatar exists
IFileInfo _fileInfo = _fileProvider.GetFileInfo(_defaultGravatarPath);
if (!_fileInfo.Exists)
{
throw new ArgumentException($"Unable to find file {_defaultGravatarPath}");
}
}
/// <summary>
/// Enables gravatar path transformations logic with the given options
/// </summary>
/// <param name="app"></param>
/// <param name="options"></param>
/// <returns></returns>
public static IApplicationBuilder UseGravatarMiddleware(this IApplicationBuilder app, GravatarOptions options)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
return(app.UseMiddleware <GravatarMiddleware>(Options.Create(options)));
}
