From ccd1db47cfe475cb8c2068c218644f866cb098f2 Mon Sep 17 00:00:00 2001
From: Tobias Klika <cee@live.at>
Date: Tue, 19 Mar 2024 13:26:24 +0100
Subject: [PATCH] image processor which strips metadata

---
 .../Processors/StripMetadataWebProcessor.cs   | 51 +++++++++++++++++++
 zero/Media/MediaExtensions.cs                 |  3 +-
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 zero/Media/ImageSharp/Processors/StripMetadataWebProcessor.cs

diff --git a/zero/Media/ImageSharp/Processors/StripMetadataWebProcessor.cs b/zero/Media/ImageSharp/Processors/StripMetadataWebProcessor.cs
new file mode 100644
index 00000000..f2d77384
--- /dev/null
+++ b/zero/Media/ImageSharp/Processors/StripMetadataWebProcessor.cs
@@ -0,0 +1,51 @@
+using Microsoft.Extensions.Logging;
+using SixLabors.ImageSharp.Web;
+using SixLabors.ImageSharp.Web.Commands;
+using SixLabors.ImageSharp.Web.Processors;
+using System.Globalization;
+
+namespace zero.Media.ImageSharp.Processors;
+
+public class StripMetadataWebProcessor : IImageWebProcessor
+{
+  // <summary>
+  /// The command constant for quality.
+  /// </summary>
+  public const string Strip = "strip";
+
+  /// <summary>
+  /// The reusable collection of commands.
+  /// </summary>
+  private static readonly IEnumerable<string> StripCommands
+      = new[] { Strip };
+
+  /// <inheritdoc/>
+  public IEnumerable<string> Commands { get; } = StripCommands;
+
+  /// <inheritdoc/>
+  public FormattedImage Process(
+      FormattedImage image,
+      ILogger logger,
+      CommandCollection commands,
+      CommandParser parser,
+      CultureInfo culture)
+  {
+    if (commands.Contains(Strip))
+    {
+      bool strip = parser.ParseValue<bool>(commands.GetValueOrDefault(Strip), culture);
+
+      if (strip)
+      {
+        image.Image.Metadata.ExifProfile = null;
+        image.Image.Metadata.XmpProfile = null;
+        image.Image.Metadata.IptcProfile = null;
+        image.Image.Metadata.IccProfile = null;
+      }
+    }
+
+    return image;
+  }
+
+  /// <inheritdoc/>
+  public bool RequiresTrueColorPixelFormat(CommandCollection commands, CommandParser parser, CultureInfo culture) => true;
+}
diff --git a/zero/Media/MediaExtensions.cs b/zero/Media/MediaExtensions.cs
index 7d9777b7..e3a5ab50 100644
--- a/zero/Media/MediaExtensions.cs
+++ b/zero/Media/MediaExtensions.cs
@@ -1,4 +1,5 @@
-using SixLabors.ImageSharp.Metadata.Profiles.Exif;
+using Microsoft.AspNetCore.Mvc.ViewFeatures;
+using SixLabors.ImageSharp.Metadata.Profiles.Exif;
 using SixLabors.ImageSharp.Web;
 using System.Numerics;