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Kreta.BusinessLogic/Logic/SystemSettings/SystemSettingsLogic.cs

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+using System;
+using System.Collections.Generic;
+using Kreta.Enums.ManualEnums.SystemSettings;
+
+namespace Kreta.BusinessLogic.Logic.SystemSettings
+{
+    public static class SystemSettingsLogic
+    {
+        public static long MaxFileSizeMB { get; } = 4;
+        public static long AllowedMaxHeight { get; } = 140;
+        public static long AllowedMaxWidth { get; } = 980;
+
+        private static Dictionary<string, string> allowedFileTypes =
+        new Dictionary<string, string>() {
+            { ".bmp", "image/bmp" },
+            { ".jpg", "image/jpeg" },
+            { ".jpeg", "image/jpeg" },
+            { ".png", "image/png" },
+        };
+
+        public static SystemSettingsFejlecLablecSzerkesztoHibakEnum ImageValidate(string content)
+        {
+            var sumLength = 0;
+            var sumWidth = 0;
+            var maxHeight = 0;
+            var imgTags = System.Text.RegularExpressions.Regex.Matches(content, "<img(.*?)src=\"(?<src>(.*?))\"(.*?)/>");
+            foreach (System.Text.RegularExpressions.Match imgTag in imgTags)
+            {
+                var group = imgTag.Groups["src"];
+                if (group.Success)
+                {
+                    string[] parts = group.Value.Split(new string[] { ";", ":", "," }, StringSplitOptions.None);
+                    if (!allowedFileTypes.ContainsValue(parts[1]))
+                    {
+                        return SystemSettingsFejlecLablecSzerkesztoHibakEnum.AFajlKiterjeszteseVagyTipusaNemMegfelelo;
+                    }
+                    var bytes = Convert.FromBase64String(parts[3]);
+                    sumLength += bytes.Length;
+                    using (System.Drawing.Image image = System.Drawing.Image.FromStream(new System.IO.MemoryStream(bytes)))
+                    {
+                        maxHeight = Math.Max(maxHeight, image.Height);
+                        sumWidth += image.Width;
+                    }
+                }
+            }
+            if (sumLength > (MaxFileSizeMB * 1024 * 1024))
+            {
+                return SystemSettingsFejlecLablecSzerkesztoHibakEnum.HibaTortentXMBNalNemLehetNagyobbAFajlMerete;
+            }
+            if (maxHeight > AllowedMaxHeight)
+            {
+                return SystemSettingsFejlecLablecSzerkesztoHibakEnum.AKepMagassagaMeghaladjaAMegengedettMeretet;
+            }
+            if (sumWidth > AllowedMaxWidth)
+            {
+                return SystemSettingsFejlecLablecSzerkesztoHibakEnum.AzOsszesKepSzelessegeMeghaladjaAMegengedettMeretet;
+            }
+            return 0;
+        }
+    }
+}