Radicade Public Code

Server/Chat/ChatPhotoMessages.cs

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+using System.Text.RegularExpressions;
+
+namespace RadicadeServer.API
+{
+	public static class ChatPhotoMessages
+	{
+		public static readonly TimeSpan UploadWindow = TimeSpan.FromMinutes(15);
+
+		private static readonly Regex ImageReference = new(@"<Image:([^>]*)>", RegexOptions.Compiled);
+
+		private static readonly Regex PhotoEnvelope = new("\"Type\"\\s*:\\s*2(?![0-9])", RegexOptions.Compiled);
+
+		public static bool IsPhotoEnvelope(string? contents)
+			=> !string.IsNullOrEmpty(contents) && PhotoEnvelope.IsMatch(contents);
+
+		public static bool HasUnresolvedImageReference(string? contents)
+		{
+			if (string.IsNullOrEmpty(contents))
+				return false;
+
+			foreach (Match match in ImageReference.Matches(contents))
+			{
+				if (!ResolvesToAnImage(match.Groups[1].Value))
+					return true;
+			}
+
+			return false;
+		}
+
+		public static string ResolveImageReference(string contents, long imageId)
+		{
+			return ImageReference.Replace(contents, match =>
+				ResolvesToAnImage(match.Groups[1].Value) ? match.Value : $"<Image:{imageId}>");
+		}
+
+		private static bool ResolvesToAnImage(string rawReference)
+			=> long.TryParse(rawReference, out var imageId) && imageId > 0;
+	}
+}