54 lines
1.9 KiB
C#
54 lines
1.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text.RegularExpressions;
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using Sozsoft.Mcp.Dtos;
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namespace Sozsoft.Mcp;
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/// <summary>
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/// Talep aciklamasina yapistirilan gorseller HtmlEditor'da base64 <c>data:</c> URI olarak
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/// saklanir. Model bu metni resim olarak goremez; gorseller ayiklanip MCP gorsel icerigi olarak
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/// iletilir, metinde yerlerine bir isaret kalir. Yalnizca modelin okuyabildigi bicimler ayiklanir;
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/// digerleri (svg gibi) metinde oldugu gibi birakilir.
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/// </summary>
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internal static partial class McpDevRequestImages
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{
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private static readonly HashSet<string> SupportedMimeTypes = new(StringComparer.OrdinalIgnoreCase)
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{
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"image/png", "image/jpeg", "image/gif", "image/webp"
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};
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[GeneratedRegex("""<img\b[^>]*?\bsrc\s*=\s*["']data:(?<mime>image/[\w.+-]+);base64,(?<data>[^"']+)["'][^>]*>""", RegexOptions.IgnoreCase)]
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private static partial Regex EmbeddedImage();
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public static (string? Html, List<McpDevRequestImageDto> Images) Extract(string? html)
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{
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var images = new List<McpDevRequestImageDto>();
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if (string.IsNullOrEmpty(html))
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{
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return (html, images);
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}
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var text = EmbeddedImage().Replace(html, match =>
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{
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var mimeType = match.Groups["mime"].Value.ToLowerInvariant();
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var data = Regex.Replace(match.Groups["data"].Value, @"\s+", string.Empty);
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if (!SupportedMimeTypes.Contains(mimeType) || !IsBase64(data))
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{
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return match.Value;
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}
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var placeholder = $"[image-{images.Count + 1}]";
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images.Add(new McpDevRequestImageDto { Placeholder = placeholder, MimeType = mimeType, Data = data });
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return placeholder;
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});
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return (text, images);
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}
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private static bool IsBase64(string data)
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=> Convert.TryFromBase64String(data, new byte[data.Length * 3 / 4], out _);
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}
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