🤖 AI 驅動的浮水印：使用智慧情境感知標記保護文件

using System;
using System.Drawing;
using System.Threading.Tasks;
using GroupDocs.Watermark;
using GroupDocs.Watermark.Options;

class Program
{
    static async Task Main()
    {
        string inputFilePath = "email.pdf";
        string outputFilePath = "result.pdf";

        // Step 1: Extract document info
        IDocumentInfo documentInfo = GetDocumentInfo(inputFilePath);

        string title = "Kai Carter 777 LUCKY AVE, LAS VEGAS, NV 16171";
        string documentType = "email";
        DateTime creationDate = DateTime.Now;

        // Step 2: Create prompt for AI
        string prompt =
            $"Generate a clean, professional text watermark for a document titled '{title}' " +
            $"of type '{documentType}', created on {creationDate:dd-MMM-yy h:mm tt}. " +
            $"The document has {documentInfo.PageCount} page" +
            $"{(documentInfo.PageCount > 1 ? "s" : "")}. " +
            $"Include useful human-readable information like classification " +
            $"(e.g., Confidential), title, date, and page count. " +
            $"Do not mention file size or technical file type. " +
            $"Return the watermark text only, in a compact format with at most 5 lines.";

        // Step 3: Generate watermark text via AI
        string watermarkText = await GenerateWatermarkTextAsync(prompt);

        // Step 4: Apply the generated watermark
        ApplyTextWatermark(inputFilePath, outputFilePath, watermarkText);

        Console.WriteLine("Watermark applied and saved to: " + outputFilePath);
    }

    static IDocumentInfo GetDocumentInfo(string filePath)
    {
        using (Watermarker watermarker = new Watermarker(filePath))
        {
            IDocumentInfo info = watermarker.GetDocumentInfo();

            Console.WriteLine($"File type: {info.FileType}");
            Console.WriteLine($"Number of pages: {info.PageCount}");
            Console.WriteLine($"Document size: {info.Size} bytes");

            return info;
        }
    }

    static async Task<string> GenerateWatermarkTextAsync(string prompt)
    {
        // This method should call your AI assistant (e.g., OpenAI, Azure OpenAI,
        // local model)
        // to generate watermark text based on the prompt.
        // Return only the watermark string without any extra explanation.

        throw new NotImplementedException("Integrate your AI assistant here.");
    }

    static void ApplyTextWatermark(string inputPath, string outputPath, 
        string watermarkText)
    {
        using (Watermarker watermarker = new Watermarker(inputPath))
        {
            Font font = new Font("Arial", 11, FontStyle.Bold | FontStyle.Italic);

            TextWatermark watermark = new TextWatermark(watermarkText, font)
            {
                ForegroundColor = Color.Red,
                Opacity = 0.2,
                TextAlignment = TextAlignment.Left,
                X = 250,
                Y = 580
            };

            watermarker.Add(watermark);
            watermarker.Save(outputPath);
        }
    }
}

// Example: Creating a customized watermark with advanced styling
TextWatermark advancedWatermark = new TextWatermark(aiGeneratedText, customFont)
{
    ForegroundColor = Color.FromArgb(128, 0, 0, 255), // 半透明藍色
    BackgroundColor = Color.FromArgb(50, 255, 255, 255), // 輕微背景
    Opacity = 0.3,
    RotateAngle = -45, // 斜向
    TextAlignment = TextAlignment.Center,
    SizingType = SizingType.ScaleToParentDimensions,
    ScaleFactor = 0.8
};

public static void RemoveWatermarkFromDocument(string filePath)
{
    using (Watermarker watermarker = new Watermarker(filePath))
    {
        // Search for watermarks
        PossibleWatermarkCollection watermarks = watermarker.Search();
        
        // Remove all found watermarks
        for (int i = watermarks.Count - 1; i >= 0; i--)
        {
            watermarks.RemoveAt(i);
        }
        
        watermarker.Save();
    }
}

// Example prompt for legal documents
string legalPrompt = $"Create a watermark for legal document '{title}' " +
    $"with case number, confidentiality level 'Attorney-Client Privileged', " +
    $"date {DateTime.Now:MMM dd yyyy}, and page count {pageCount}. " +
    $"Include 'NOT FOR DISTRIBUTION' warning.";

// Example for quarterly financial reports
string financialPrompt = $"Generate watermark for Q{quarter} {year} financial report " +
    $"titled '{title}'. Include 'CONFIDENTIAL - INTERNAL USE ONLY', " +
    $"report date, and compliance notice. Format professionally.";

// Employee document watermarking
string hrPrompt = $"Create watermark for HR document '{title}' " +
    $"for employee {employeeName}, department {department}. " +
    $"Include confidentiality level, retention period, and HR compliance notice.";