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Copy pathAppStaticFileMiddleware.cs
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Copy pathAppStaticFileMiddleware.cs
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312 lines (289 loc) · 12.7 KB
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using System.Buffers;
using System.Collections.Concurrent;
using System.IO.Pipelines;
using System.Text;
using Microsoft.AspNetCore.Antiforgery;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.FileProviders;
using Microsoft.Net.Http.Headers;
using NpgsqlRest;
using NpgsqlRest.Auth;
namespace NpgsqlRestClient;
public class AppStaticFileMiddleware(RequestDelegate next, IWebHostEnvironment hostingEnv)
{
private readonly RequestDelegate _next = next ?? throw new ArgumentNullException(nameof(next));
private readonly IWebHostEnvironment _hostingEnv = hostingEnv ?? throw new ArgumentNullException(nameof(hostingEnv));
private static readonly FileExtensionContentTypeProvider _fileTypeProvider = new();
private static string[]? _parsePatterns = default!;
private static ILogger? _logger = default!;
private static readonly ConcurrentDictionary<string, bool> _pathInParsePattern = new();
private static ConcurrentDictionary<string, bool> _pathInAuthorizePattern = null!;
// New cache for parsed file contents
private static readonly ConcurrentDictionary<string, (byte[] Content, DateTimeOffset LastModified)> _parsedFileCache = new();
private static bool _cacheParsedFiles = true;
private static IAntiforgery? _antiforgery;
private static DefaultResponseParser? _parser;
private static string[]? _headers;
private static string[]? _authorizePaths;
private static string? _unauthorizedRedirectPath;
private static string? _unauthorizedReturnToQueryParameter;
private static bool _checkAuthorize = false;
private static string[] _defaultFileNames = default!;
public static void ConfigureStaticFileMiddleware(
bool parse,
string[]? parsePatterns,
NpgsqlRestAuthenticationOptions options,
bool cacheParsedFiles,
string? antiforgeryFieldNameTag,
string? antiforgeryTokenTag,
IAntiforgery? antiforgery,
string[]? headers,
string[]? authorizePaths,
string? unauthorizedRedirectPath,
string? unautorizedReturnToQueryParameter,
Dictionary<string, string?>? availableClaims,
Dictionary<string, string?>? availableEnvVars,
ILogger? logger)
{
_parsePatterns = parse == false || parsePatterns == null || parsePatterns.Length == 0 ? null : parsePatterns?.Where(p => !string.IsNullOrEmpty(p)).ToArray();
if (parse is false || _parsePatterns is null)
{
_parser = null;
}
else
{
_parser = new DefaultResponseParser(options, antiforgeryFieldNameTag, antiforgeryTokenTag, availableClaims, availableEnvVars);
}
_antiforgery = antiforgery;
_logger = logger;
_cacheParsedFiles = cacheParsedFiles;
_headers = headers;
_authorizePaths = authorizePaths;
_unauthorizedRedirectPath = unauthorizedRedirectPath;
_unauthorizedReturnToQueryParameter = unautorizedReturnToQueryParameter;
_checkAuthorize = authorizePaths is not null && authorizePaths.Length > 0;
if (_checkAuthorize is true)
{
_pathInAuthorizePattern = new();
var dfo = new DefaultFilesOptions();
_defaultFileNames = [.. dfo.DefaultFileNames];
}
}
public async Task InvokeAsync(HttpContext context)
{
string method = context.Request.Method;
bool isGet = HttpMethods.IsGet(method);
if (!isGet && !HttpMethods.IsHead(method))
{
await _next(context);
return;
}
PathString path = context.Request.Path; // Cache PathString
IFileInfo fileInfo = _hostingEnv.WebRootFileProvider.GetFileInfo(path);
if (!fileInfo.Exists || fileInfo.IsDirectory)
{
await _next(context);
return;
}
var pathString = path.ToString();
long length = fileInfo.Length;
DateTimeOffset lastModified = fileInfo.LastModified.ToUniversalTime();
bool isInParsePattern = false;
if (_checkAuthorize is true)
{
if (_pathInAuthorizePattern.TryGetValue(pathString, out bool isInAuthPattern) is false)
{
isInAuthPattern = false;
for (int i = 0; i < _authorizePaths?.Length; i++)
{
if (Parser.IsPatternMatch(pathString, _authorizePaths[i]))
{
isInAuthPattern = true;
break;
}
}
_pathInAuthorizePattern.TryAdd(pathString, isInAuthPattern);
}
if (isInAuthPattern is true)
{
if (context.User.Identity is not null && context.User.Identity.IsAuthenticated is false)
{
context.Response.Clear();
if (string.IsNullOrEmpty(_unauthorizedRedirectPath) is false)
{
if (string.IsNullOrEmpty(_unauthorizedReturnToQueryParameter) is false)
{
context.Response.Redirect(new StringBuilder()
.Append(_unauthorizedRedirectPath)
.Append(_unauthorizedRedirectPath.Contains('?') ? "&" : "?")
.Append(_unauthorizedReturnToQueryParameter)
.Append('=')
.Append(Uri.EscapeDataString(string.Concat(GetOriginalRequestPath(pathString), context.Request.QueryString.ToString())))
.ToString());
}
else
{
context.Response.Redirect(_unauthorizedRedirectPath);
}
}
else
{
context.Response.StatusCode = StatusCodes.Status401Unauthorized;
}
return;
}
}
}
if (isGet)
{
if (_pathInParsePattern.TryGetValue(pathString, out isInParsePattern) is false)
{
isInParsePattern = false;
for (int i = 0; i < _parsePatterns?.Length; i++)
{
if (Parser.IsPatternMatch(pathString, _parsePatterns[i]))
{
isInParsePattern = true;
break;
}
}
_pathInParsePattern.TryAdd(pathString, isInParsePattern);
}
}
AntiforgeryTokenSet? tokenSet = null;
if (_antiforgery is not null)
{
if (pathString.EndsWith(".html") is true || pathString.EndsWith(".htm") is true)
{
tokenSet = _antiforgery.GetAndStoreTokens(context);
}
}
string contentType = fileInfo.PhysicalPath != null && _fileTypeProvider.TryGetContentType(fileInfo.PhysicalPath, out var ct)
? ct
: "application/octet-stream";
context.Response.StatusCode = StatusCodes.Status200OK;
context.Response.ContentType = contentType;
if (isInParsePattern is false)
{
long etagHash = lastModified.ToFileTime() ^ length;
string etagString = string.Concat("\"", Convert.ToString(etagHash, 16), "\"");
var ifNoneMatch = context.Request.Headers[HeaderNames.IfNoneMatch];
if (!string.IsNullOrEmpty(ifNoneMatch) &&
System.Net.Http.Headers.EntityTagHeaderValue.TryParse(ifNoneMatch, out var clientEtag) &&
string.Equals(etagString, clientEtag.ToString(), StringComparison.Ordinal))
{
context.Response.StatusCode = StatusCodes.Status304NotModified;
return;
}
var ifModifiedSince = context.Request.Headers[HeaderNames.IfModifiedSince];
if (!string.IsNullOrEmpty(ifModifiedSince) && DateTimeOffset.TryParse(ifModifiedSince, out var since) && since >= lastModified)
{
context.Response.StatusCode = StatusCodes.Status304NotModified;
return;
}
context.Response.Headers[HeaderNames.LastModified] = lastModified.ToString("R");
context.Response.Headers[HeaderNames.ETag] = etagString;
context.Response.Headers[HeaderNames.AcceptRanges] = "bytes";
}
else
{
if (_headers is not null)
{
for (int i = 0; i < _headers.Length; i++)
{
if (string.IsNullOrEmpty(_headers[i]))
{
continue;
}
var parts = _headers[i].Split(':', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
if (parts.Length != 2 || string.IsNullOrWhiteSpace(parts[0]) || string.IsNullOrWhiteSpace(parts[1]))
{
continue;
}
context.Response.Headers[parts[0]] = parts[1];
}
}
}
if (isGet)
{
try
{
byte[] buffer;
if (_parser is null || isInParsePattern is false)
{
using var fileStream = new FileStream(fileInfo.PhysicalPath!, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 8192, useAsync: true);
await fileStream.CopyToAsync(context.Response.Body, context.RequestAborted);
return;
}
// Check cache for parsed files
if (isInParsePattern && _cacheParsedFiles && _parsedFileCache.TryGetValue(pathString, out var cached) && cached.LastModified >= lastModified)
{
buffer = cached.Content;
}
else
{
// Read file from disk
using var fileStream = new FileStream(fileInfo.PhysicalPath!, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 8192, useAsync: true);
buffer = new byte[(int)fileInfo.Length];
await fileStream.ReadExactlyAsync(buffer, context.RequestAborted);
// Cache the file content if enabled
if (_cacheParsedFiles)
{
_parsedFileCache[pathString] = (buffer, lastModified);
}
}
int charCount = Encoding.UTF8.GetCharCount(buffer);
char[] chars = ArrayPool<char>.Shared.Rent(charCount);
try
{
Encoding.UTF8.GetChars(buffer, 0, buffer.Length, chars, 0);
ReadOnlySpan<char> result = _parser.Parse(new ReadOnlySpan<char>(chars, 0, charCount), context, tokenSet);
var writer = PipeWriter.Create(context.Response.Body);
try
{
int maxBytesNeeded = Encoding.UTF8.GetMaxByteCount(result.Length);
Memory<byte> memory = writer.GetMemory(maxBytesNeeded);
int actualBytesWritten = Encoding.UTF8.GetBytes(result, memory.Span);
writer.Advance(actualBytesWritten);
context.Response.ContentLength = actualBytesWritten;
await writer.FlushAsync(context.RequestAborted);
}
finally
{
await writer.CompleteAsync();
}
}
finally
{
ArrayPool<char>.Shared.Return(chars);
}
}
catch (IOException ex)
{
_logger?.LogError(ex, "Failed to serve static file {Path}", path);
context.Response.Clear();
await _next(context);
return;
}
}
// HEAD request completes here
}
private static string GetOriginalRequestPath(string path)
{
if (string.IsNullOrEmpty(path) || path.Length < 2)
{
return path;
}
ReadOnlySpan<char> pathSpan = path.AsSpan();
for (int i = 0; i < _defaultFileNames.Length; i++)
{
string defaultFile = _defaultFileNames[i];
if (pathSpan.EndsWith(defaultFile.AsSpan(), StringComparison.OrdinalIgnoreCase) &&
pathSpan.Length > defaultFile.Length && pathSpan[^(defaultFile.Length + 1)] == '/')
{
return path[..^defaultFile.Length];
}
}
return path;
}
}
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