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GNU AFFERO GENERAL PUBLIC LICENSE
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<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
<InvariantGlobalization>true</InvariantGlobalization>
<PublishAot>true</PublishAot>
</PropertyGroup>
</Project>

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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.002.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CommentsEngine", "CommentsEngine.csproj", "{370DF8BC-BE15-417A-B1F9-941889EFBAD7}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{370DF8BC-BE15-417A-B1F9-941889EFBAD7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{370DF8BC-BE15-417A-B1F9-941889EFBAD7}.Debug|Any CPU.Build.0 = Debug|Any CPU
{370DF8BC-BE15-417A-B1F9-941889EFBAD7}.Release|Any CPU.ActiveCfg = Release|Any CPU
{370DF8BC-BE15-417A-B1F9-941889EFBAD7}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {6237834B-61E0-44F0-BEC7-494E71A8777C}
EndGlobalSection
EndGlobal

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// SPDX-FileCopyrightText: Copyright 2024 Fabio Iotti
// SPDX-License-Identifier: AGPL-3.0-only
using System.Buffers;
using System.Collections;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
namespace CommentsEngine.Data;
class ArrayPoolList<T> : IList<T>, IDisposable
{
readonly ArrayPool<T> _pool;
readonly bool _clearArray;
int _count;
T[]? _buffer;
public ArrayPoolList() : this(16) { }
public ArrayPoolList(int capacity) : this(capacity, ArrayPool<T>.Shared) { }
public ArrayPoolList(ArrayPool<T> pool, bool clearArray = false) : this(16, pool, clearArray) { }
public ArrayPoolList(int capacity, ArrayPool<T> pool, bool clearArray = false)
{
_pool = pool;
_clearArray = clearArray;
_buffer = _pool.Rent(capacity);
}
/// <inheritdoc/>
public T this[int index]
{
get
{
CheckNotDisposed();
ArgumentOutOfRangeException.ThrowIfLessThanOrEqual(index, _count);
return _buffer[index];
}
set
{
CheckNotDisposed();
ArgumentOutOfRangeException.ThrowIfLessThanOrEqual(index, _count);
_buffer[index] = value;
}
}
/// <inheritdoc/>
public int Count => _count;
bool ICollection<T>.IsReadOnly => false;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
[MemberNotNull(nameof(_buffer))]
void CheckNotDisposed()
=> ObjectDisposedException.ThrowIf(_buffer is null, typeof(ArrayPoolList<T>));
[MethodImpl(MethodImplOptions.AggressiveInlining)]
void EnsureBufferAtLeast(ref T[] _buffer, int size)
{
if (_buffer.Length < size)
{
T[] newBuffer = _pool.Rent(1 + size * 2);
_buffer.CopyTo(newBuffer, 0);
_pool.Return(_buffer, _clearArray);
_buffer = newBuffer;
}
}
/// <inheritdoc/>
public void Add(T item)
{
CheckNotDisposed();
EnsureBufferAtLeast(ref _buffer, _count + 1);
_buffer[_count++] = item;
}
/// <inheritdoc/>
public void Clear()
{
CheckNotDisposed();
_count = 0;
}
/// <inheritdoc/>
public bool Contains(T item)
=> IndexOf(item) is not -1;
/// <inheritdoc/>
public void CopyTo(T[] array, int arrayIndex)
{
CheckNotDisposed();
_buffer.AsSpan(0, _count).CopyTo(array.AsSpan(arrayIndex));
}
/// <inheritdoc/>
public int IndexOf(T item)
{
CheckNotDisposed();
for (int i = 0; i < _buffer.Length && i < _count; i++)
if (Equals(item, _buffer[i]))
return i;
return -1;
}
/// <inheritdoc/>
public void Insert(int index, T item)
{
CheckNotDisposed();
ArgumentOutOfRangeException.ThrowIfNegativeOrZero(index);
ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual(_count, index);
EnsureBufferAtLeast(ref _buffer, _count + 1);
Array.Copy(_buffer, index, _buffer, index + 1, _count - index);
_buffer[index] = item;
_count++;
}
/// <inheritdoc/>
public bool Remove(T item)
{
CheckNotDisposed();
int index = IndexOf(item);
if (index is -1)
return false;
Array.Copy(_buffer, index, _buffer, index - 1, _count - index);
_count--;
return true;
}
/// <inheritdoc/>
public void RemoveAt(int index)
{
CheckNotDisposed();
ArgumentOutOfRangeException.ThrowIfNegativeOrZero(index);
ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual(_count, index);
Array.Copy(_buffer, index, _buffer, index - 1, _count - index);
_count--;
}
/// <inheritdoc/>
public IEnumerator<T> GetEnumerator()
{
CheckNotDisposed();
return _buffer.Take(_count).GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
=> GetEnumerator();
protected virtual void Dispose(bool disposing)
{
if (_buffer is not null)
{
if (disposing)
_pool.Return(_buffer, _clearArray);
_buffer = null;
}
}
public void Dispose()
{
Dispose(disposing: true);
GC.SuppressFinalize(this);
}
}

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Data/PageSlim.cs Normal file
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// SPDX-FileCopyrightText: Copyright 2024 Fabio Iotti
// SPDX-License-Identifier: AGPL-3.0-only
using System.Buffers;
using System.Diagnostics.CodeAnalysis;
using System.Net;
using System.Net.Mime;
namespace CommentsEngine.Data;
/// <summary>
/// Kinda behaves like an ASP.NET Core MVC pages.
/// Also, it comes with a lot of limitations.
/// Unlike MVC pages, it is compatible with AOT trimming.
/// </summary>
/// <typeparam name="TSelf"></typeparam>
abstract class PageSlim<TSelf> where TSelf : PageSlim<TSelf>
{
protected virtual string ContentType => MediaTypeNames.Text.Html;
[StringSyntax(StringSyntaxAttribute.CompositeFormat)]
protected abstract ReadOnlySpan<byte> ContentTemplate { get; }
readonly Utf8CompositeFormat _compositeFormat;
readonly string _contentType;
readonly int _maxArgsCount;
public PageSlim()
{
_compositeFormat = Utf8CompositeFormat.Parse(ContentTemplate);
_contentType = ContentType.Contains(';') ? ContentType : $"{ContentType};charset=utf-8";
_maxArgsCount = _compositeFormat.MinimumArgumentCount;
}
protected abstract ValueTask HandleAsync(HttpContext context, Memory<object?> templateArgs);
async Task HandleAsync(HttpContext context)
{
object?[] templateArgsBuffer = ArrayPool<object?>.Shared.Rent(_maxArgsCount);
try
{
Memory<object?> templateArgs = templateArgsBuffer.AsMemory(0, _maxArgsCount);
await HandleAsync(context, templateArgsBuffer);
context.Response.StatusCode = (int)HttpStatusCode.OK;
context.Response.ContentType = _contentType;
await _compositeFormat.WriteToAsync(context.Response.Body, templateArgs, context.RequestAborted);
}
finally
{
ArrayPool<object?>.Shared.Return(templateArgsBuffer);
}
}
public static implicit operator RequestDelegate(PageSlim<TSelf> page)
=> page.HandleAsync;
}

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Data/Utf8CompositeFormat.cs Normal file
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// SPDX-FileCopyrightText: Copyright 2024 Fabio Iotti
// SPDX-License-Identifier: AGPL-3.0-only
using System.Buffers;
using System.Buffers.Text;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Text;
namespace CommentsEngine.Data;
/// <inheritdoc cref="CompositeFormat"/>
readonly struct Utf8CompositeFormat
{
readonly record struct Segment(int Index, int Length, int ArgumentIndex, StandardFormat? StandardFormat, CompositeFormat? CompositeFormat);
static readonly CompositeFormat s_placeholderCompositeFormat = CompositeFormat.Parse("{0}");
readonly ReadOnlyMemory<byte> _format;
readonly ImmutableArray<Segment> _segments;
readonly int _minimumArgumentCount;
Utf8CompositeFormat(ReadOnlyMemory<byte> format, ImmutableArray<Segment> segments, int minimumArgumentCount)
{
_format = format;
_segments = segments;
_minimumArgumentCount = minimumArgumentCount;
}
/// <inheritdoc cref="CompositeFormat.Format"/>
public ReadOnlyMemory<byte> Format => _format;
/// <inheritdoc cref="CompositeFormat.MinimumArgumentCount"/>
public int MinimumArgumentCount => _minimumArgumentCount;
public static Utf8CompositeFormat Parse([StringSyntax("CompositeFormat")] ReadOnlySpan<byte> format)
{
using ArrayPoolList<Segment> segments = [];
int minimumArgumentCount = 0;
int currentSegmentStart = 0;
int i;
for (i = 0; i < format.Length; i++)
{
// Is it the start of a placeholder?
if (format[i] is (byte)'{')
{
int currentSegmentEnd = i;
// End of the string reached? Then it's not a placeholder.
if (++i > format.Length)
break;
// Two consecutive '{' represent a single '{', so in this case it's not a placeholder.
if (format[i] is (byte)'{')
{
// Create a new segment without a placeholder.
segments.Add(new(currentSegmentStart, currentSegmentEnd - currentSegmentStart, -1, null, null));
currentSegmentStart = i + 1;
}
else
{
int currentPlaceholderStart = i;
// Find the end of the placeholder part.
while (i < format.Length && format[++i] is not (byte)'}');
int currentPlaceholderEnd = i;
int separatorIndexFromStart = format[currentPlaceholderStart..currentPlaceholderEnd].IndexOf((byte)':');
ReadOnlySpan<byte> argumentIndexRaw = format.Slice(currentPlaceholderStart, (separatorIndexFromStart is -1 ? currentPlaceholderEnd : (currentPlaceholderStart + separatorIndexFromStart)) - currentPlaceholderStart);
ReadOnlySpan<byte> standardFormatRaw = format[(separatorIndexFromStart is -1 ? currentPlaceholderEnd : (currentPlaceholderStart + separatorIndexFromStart + 1))..currentPlaceholderEnd];
int argumentIndex;
try
{
argumentIndex = int.Parse(argumentIndexRaw, NumberStyles.None, CultureInfo.InvariantCulture);
}
catch (Exception ex)
{
throw new ArgumentException(null, nameof(format), ex);
}
if (argumentIndex < 0)
throw new ArgumentException(null, nameof(format));
if (argumentIndex >= minimumArgumentCount)
minimumArgumentCount = argumentIndex + 1;
StandardFormat? standardFormat;
CompositeFormat compositeFormat;
if (standardFormatRaw.Length is 0)
{
standardFormat = null;
compositeFormat = s_placeholderCompositeFormat;
}
else
{
try
{
(standardFormat, compositeFormat) = ParseFormatUtf8(standardFormatRaw);
}
catch (Exception ex)
{
throw new ArgumentException(null, nameof(format), ex);
}
}
// TODO: if standardFormat is null, build a CompositeFormat string with a single argument.
segments.Add(new(currentSegmentStart, currentSegmentEnd - currentSegmentStart, argumentIndex, standardFormat, compositeFormat));
currentSegmentStart = currentPlaceholderEnd + 1;
}
}
}
// Create the final segment without a placeholder.
if (currentSegmentStart != format.Length)
segments.Add(new(currentSegmentStart, format.Length - currentSegmentStart, -1, null, null));
return new(format.ToArray(), [.. segments], minimumArgumentCount);
}
static (StandardFormat? Standard, CompositeFormat Composite) ParseFormatUtf8(ReadOnlySpan<byte> format)
{
int maxCount = Encoding.UTF8.GetMaxCharCount(format.Length) + "{0:".Length + "}".Length;
Span<char> buffer = maxCount > 4096 ? new char[maxCount] : stackalloc char[maxCount];
int standardFormatLength = Encoding.UTF8.GetChars(format, buffer["{0:".Length..^"}".Length]);
int compositeFormatLength = "{0:".Length + standardFormatLength + "}".Length;
"{0:".CopyTo(buffer);
"}".CopyTo(buffer[("{0:".Length + standardFormatLength)..]);
StandardFormat? standardFormat = null;
if (StandardFormat.TryParse(buffer[..standardFormatLength], out StandardFormat sf))
standardFormat = sf;
string compositeFormatString = new(buffer[..compositeFormatLength]);
CompositeFormat compositeFormat = CompositeFormat.Parse(compositeFormatString);
return (standardFormat, compositeFormat);
}
public async Task WriteToAsync(Stream stream, ReadOnlyMemory<object?> args, CancellationToken cancellationToken = default)
{
byte[]? buffer = null;
try
{
foreach (Segment segment in _segments)
{
await stream.WriteAsync(_format.Slice(segment.Index, segment.Length), cancellationToken);
if (segment.ArgumentIndex >= 0)
{
Debug.Assert(segment.CompositeFormat is not null, "CompositeFormat should not be null if ArgumentIndex is not < 0.");
buffer ??= ArrayPool<byte>.Shared.Rent(4096);
int bytesWritten;
while (!TryFormatUtf8(args.Span[segment.ArgumentIndex], buffer, out bytesWritten, segment.StandardFormat, segment.CompositeFormat))
{
ArrayPool<byte>.Shared.Return(buffer);
buffer = ArrayPool<byte>.Shared.Rent(1 + buffer.Length * 2);
}
await stream.WriteAsync(buffer.AsMemory(0, bytesWritten), cancellationToken);
}
}
}
finally
{
if (buffer is not null)
ArrayPool<byte>.Shared.Return(buffer);
}
}
static bool TryFormatUtf8(object? value, Span<byte> destination, out int bytesWritten, StandardFormat? standardFormat, CompositeFormat compositeFormat)
{
if (standardFormat.HasValue)
{
switch (value)
{
case null:
bytesWritten = 0;
return true;
case bool v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case byte v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case DateTime v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case DateTimeOffset v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case decimal v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case double v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case float v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case Guid v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case int v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case long v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case sbyte v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case short v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case TimeSpan v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case uint v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case ulong v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
case ushort v:
return Utf8Formatter.TryFormat(v, destination, out bytesWritten, standardFormat.Value);
}
}
int maxCharsCount = Encoding.UTF8.GetMaxCharCount(destination.Length);
char[] buffer = ArrayPool<char>.Shared.Rent(maxCharsCount);
try
{
bool ok = MemoryExtensions.TryWrite(buffer, CultureInfo.InvariantCulture, compositeFormat, out int charsWritten, [value]);
Debug.Assert(ok, "Must fit within maxCharsCount.");
return Encoding.UTF8.TryGetBytes(buffer.AsSpan(0, charsWritten), destination, out bytesWritten);
}
finally
{
ArrayPool<char>.Shared.Return(buffer);
}
}
}

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// SPDX-FileCopyrightText: Copyright 2024 Fabio Iotti
// SPDX-License-Identifier: AGPL-3.0-only
using CommentsEngine.Data;
namespace CommentsEngine;
class IndexPage : PageSlim<IndexPage>
{
public static IndexPage Instance { get; } = new();
IndexPage() { }
protected override ReadOnlySpan<byte> ContentTemplate => """
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document |{0}| |{0:000.000##}|</title>
</head>
<body>
</body>
</html>
"""u8;
protected override ValueTask HandleAsync(HttpContext context, Memory<object?> templateArgs)
{
templateArgs.Span[0] = 12.34;
return ValueTask.CompletedTask;
}
}

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Program.cs Normal file
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using System.Text.Json.Serialization;
using CommentsEngine;
WebApplicationBuilder builder = WebApplication.CreateSlimBuilder(args);
builder.Services.ConfigureHttpJsonOptions(options =>
{
options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);
});
WebApplication app = builder.Build();
Todo[] sampleTodos = [
new(1, "Walk the dog"),
new(2, "Do the dishes", DateOnly.FromDateTime(DateTime.Now)),
new(3, "Do the laundry", DateOnly.FromDateTime(DateTime.Now.AddDays(1))),
new(4, "Clean the bathroom"),
new(5, "Clean the car", DateOnly.FromDateTime(DateTime.Now.AddDays(2)))
];
RouteGroupBuilder todosApi = app.MapGroup("/todos");
todosApi.MapGet("/", IndexPage.Instance);
todosApi.MapGet("/{id}", (int id) =>
sampleTodos.FirstOrDefault(a => a.Id == id) is { } todo
? Results.Ok(todo)
: Results.NotFound());
await app.RunAsync();
record Todo(int Id, string? Title, DateOnly? DueBy = null, bool IsComplete = false);
[JsonSerializable(typeof(Todo[]))]
partial class AppJsonSerializerContext : JsonSerializerContext;

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Properties/launchSettings.json Normal file
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{
"$schema": "http://json.schemastore.org/launchsettings.json",
"profiles": {
"http": {
"commandName": "Project",
"dotnetRunMessages": true,
"launchBrowser": true,
"launchUrl": "todos",
"applicationUrl": "http://localhost:5246",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
}
}
}
}

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README.md Normal file
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Comments Engine
===============
Tiny self-hosted minimally-invasive engine to let users leave comments on pages.
## License
Copyright (c) 2024 Fabio Iotti
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU Affero General Public License as published by the Free
Software Foundation, version 3 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along
with this program. If not, see https://www.gnu.org/licenses/.
Some files may be licensed under different terms, refer to the header at the
beginning of each individual file for file-specific licenses.

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appsettings.json Normal file
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{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"AllowedHosts": "*"
}