浅谈ASP.NET Core静态文件处理源码探究

public class StaticFileMiddleware { private readonly StaticFileOptions _options; private readonly PathString _matchUrl; private readonly RequestDelegate _next; private readonly ILogger _logger; private readonly IFileProvider _fileProvider; private readonly IContentTypeProvider _contentTypeProvider; public StaticFileMiddleware(RequestDelegate next, IWebHostEnvironment hostingEnv, IOptions<StaticFileOptions> options, ILoggerFactory loggerFactory) { _next = next; _options = options.Value; //设置文件类型提供程序 _contentTypeProvider = options.Value.ContentTypeProvider ?? new FileExtensionContentTypeProvider(); //文件提供程序 _fileProvider = _options.FileProvider ?? Helpers.ResolveFileProvider(hostingEnv); //匹配路径 _matchUrl = _options.RequestPath; _logger = loggerFactory.CreateLogger<StaticFileMiddleware>(); } public Task Invoke(HttpContext context) { //判断是够获取到终结点信息，这也就是为什么我们使用UseStaticFiles要在UseRouting之前 if (!ValidateNoEndpoint(context)) { } //判断HttpMethod，只能是Get和Head操作 else if (!ValidateMethod(context)) { } //判断请求路径是否存在 else if (!ValidatePath(context, _matchUrl, out var subPath)) { } //根据请求文件名称判断是否可以匹配到对应的MimeType，如果匹配到则返回contentType else if (!LookupContentType(_contentTypeProvider, _options, subPath, out var contentType)) { } else { //执行静态文件操作 return TryServeStaticFile(context, contentType, subPath); } return _next(context); } private Task TryServeStaticFile(HttpContext context, string contentType, PathString subPath) { var fileContext = new StaticFileContext(context, _options, _logger, _fileProvider, contentType, subPath); //判断文件是否存在 if (!fileContext.LookupFileInfo()) { _logger.FileNotFound(fileContext.SubPath); } else { //静态文件处理 return fileContext.ServeStaticFile(context, _next); } return _next(context); } }

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