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[backend] Add identicon endpoint (ISH-42)

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Laura Hausmann 2024-02-11 23:05:37 +01:00
parent 97df7ea5e6
commit 5db0118cc8
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3 changed files with 128 additions and 0 deletions
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123
Iceshrimp.Backend/Controllers/IdenticonController.cs Normal file
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@ -0,0 +1,123 @@
using System.IO.Hashing;
using System.Text;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Maui.Graphics;
using Microsoft.Maui.Graphics.Skia;
namespace Iceshrimp.Backend.Controllers;
[ApiController]
[EnableCors("drive")]
[Route("/identicon/{id}")]
public class IdenticonController : Controller {
public IActionResult GetIdenticon(string id) {
using var bitmap = new SkiaBitmapExportContext(Size, Size, 1.0f);
var canvas = bitmap.Canvas;
var random = new Random((int)XxHash32.HashToUInt32(Encoding.UTF8.GetBytes(id)));
var color = Colors[random.Next(0, Colors.Count - 1)];
var gradient = new LinearGradientPaint(new Point(0, 0), new Point(1, 1)) {
StartColor = color.start,
EndColor = color.end
};
var rect = new RectF(0, 0, Size, Size);
canvas.SetFillPaint(gradient, rect);
canvas.FillRectangle(rect);
var paint = new SolidPaint(Microsoft.Maui.Graphics.Colors.White);
canvas.SetFillPaint(paint, rect);
var side = new bool[SideN, CellCount];
var center = new bool[CellCount];
for (var i = 0; i < SideN; i++) {
for (var j = 0; j < CellCount; j++) {
side[i, j] = random.Next(3) == 0;
}
}
for (var i = 0; i < CellCount; i++) {
center[i] = random.Next(3) == 0;
}
for (var i = 0; i < CellCount; i++) {
for (var j = 0; j < CellCount; j++) {
var isXCenter = i == (CellCount - 1) / 2;
if (isXCenter && !center[j])
continue;
var isLeftSide = i < (CellCount - 1) / 2;
if (isLeftSide && !side[i, j])
continue;
var isRightSide = i > (CellCount - 1) / 2;
if (isRightSide && !side[SideN - (i - SideN), j])
continue;
var actualX = Margin + CellSize * i;
var actualY = Margin + CellSize * j;
canvas.FillRectangle(new Rect(actualX, actualY, CellSize, CellSize));
}
}
var stream = new MemoryStream();
bitmap.WriteToStream(stream);
stream.Seek(0, SeekOrigin.Begin);
Response.Headers.CacheControl = "max-age=31536000, immutable";
return File(stream, "image/png");
}
#region Color definitions & Constants
private const int Size = 160;
private const int Margin = Size / 4;
private const int CellCount = 5;
private const int CellCanvasSize = Size - Margin * 2;
private const int CellSize = CellCanvasSize / CellCount;
private const int SideN = CellCount / 2;
private static readonly List<(Color start, Color end)> Colors = [
(new Color(235, 111, 146), new Color(180, 99, 122)),
(new Color(246, 193, 119), new Color(234, 157, 52)),
(new Color(235, 188, 186), new Color(215, 130, 126)),
(new Color(156, 207, 216), new Color(86, 148, 159)),
(new Color(196, 167, 231), new Color(144, 122, 169)),
(new Color(235, 111, 146), new Color(246, 193, 119)),
(new Color(235, 111, 146), new Color(235, 188, 186)),
(new Color(235, 111, 146), new Color(49, 116, 143)),
(new Color(235, 111, 146), new Color(156, 207, 216)),
(new Color(235, 111, 146), new Color(196, 167, 231)),
(new Color(246, 193, 119), new Color(235, 111, 146)),
(new Color(246, 193, 119), new Color(235, 188, 186)),
(new Color(246, 193, 119), new Color(49, 116, 143)),
(new Color(246, 193, 119), new Color(156, 207, 216)),
(new Color(246, 193, 119), new Color(196, 167, 231)),
(new Color(235, 188, 186), new Color(235, 111, 146)),
(new Color(235, 188, 186), new Color(246, 193, 119)),
(new Color(235, 188, 186), new Color(49, 116, 143)),
(new Color(235, 188, 186), new Color(156, 207, 216)),
(new Color(235, 188, 186), new Color(196, 167, 231)),
(new Color(49, 116, 143), new Color(235, 111, 146)),
(new Color(49, 116, 143), new Color(246, 193, 119)),
(new Color(49, 116, 143), new Color(235, 188, 186)),
(new Color(49, 116, 143), new Color(156, 207, 216)),
(new Color(49, 116, 143), new Color(196, 167, 231)),
(new Color(156, 207, 216), new Color(235, 111, 146)),
(new Color(156, 207, 216), new Color(246, 193, 119)),
(new Color(156, 207, 216), new Color(235, 188, 186)),
(new Color(156, 207, 216), new Color(49, 116, 143)),
(new Color(156, 207, 216), new Color(196, 167, 231)),
(new Color(196, 167, 231), new Color(235, 111, 146)),
(new Color(196, 167, 231), new Color(246, 193, 119)),
(new Color(196, 167, 231), new Color(235, 188, 186)),
(new Color(196, 167, 231), new Color(49, 116, 143)),
(new Color(196, 167, 231), new Color(156, 207, 216))
];
#endregion
}

4
Iceshrimp.Backend/Iceshrimp.Backend.csproj
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@ -31,10 +31,14 @@
</PackageReference>
<PackageReference Include="Microsoft.Extensions.Caching.StackExchangeRedis" Version="8.0.1"/>
<PackageReference Include="Microsoft.Extensions.Configuration.Ini" Version="8.0.0"/>
<PackageReference Include="Microsoft.Maui.Graphics" Version="8.0.6"/>
<PackageReference Include="Microsoft.Maui.Graphics.Skia" Version="8.0.6"/>
<PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.0"/>
<PackageReference Include="protobuf-net" Version="3.2.30"/>
<PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="2.88.7" />
<PackageReference Include="StackExchange.Redis" Version="2.7.17"/>
<PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0"/>
<PackageReference Include="System.IO.Hashing" Version="8.0.0"/>
<PackageReference Include="Vite.AspNetCore" Version="1.11.0"/>
</ItemGroup>

1
Iceshrimp.NET.sln.DotSettings
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@ -345,6 +345,7 @@
<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpUseContinuousIndentInsideBracesMigration/@EntryIndexedValue">True</s:Boolean>
<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ESettingsUpgrade_002EMigrateBlankLinesAroundFieldToBlankLinesAroundProperty/@EntryIndexedValue">True</s:Boolean>
<s:Boolean x:Key="/Default/UserDictionary/Words/=Iceshrimp/@EntryIndexedValue">True</s:Boolean>
<s:Boolean x:Key="/Default/UserDictionary/Words/=Identicon/@EntryIndexedValue">True</s:Boolean>
<s:Boolean x:Key="/Default/UserDictionary/Words/=litepub/@EntryIndexedValue">True</s:Boolean>
<s:Boolean x:Key="/Default/UserDictionary/Words/=misskeymarkdown/@EntryIndexedValue">True</s:Boolean>
<s:Boolean x:Key="/Default/UserDictionary/Words/=nodeinfo/@EntryIndexedValue">True</s:Boolean>