kindeditor编辑器图片水印

//upload_pic.ashx源码

<%@ webhandler Language="C#" class="edit_html_upload_pic" %>
using System;
using System.Collections;
using System.Web;
using System.IO;
using System.Globalization;
using LitJson;
using System.Web.SessionState;
using System.Drawing;  
using System.Drawing.Imaging;  
public class edit_html_upload_pic : IHttpHandler, IRequiresSessionState
{
    private HttpContext context;

    public void ProcessRequest(HttpContext context)
    {
        String aspxUrl = context.Request.Path.Substring(0, context.Request.Path.LastIndexOf("/") + 1);

        //每个用户文件夹独立IRequiresSessionState 
        String sessionUploadPath = String.Empty;
        if (HttpContext.Current.Session["edit_upload_folder"] != null)
        {
            sessionUploadPath = HttpContext.Current.Session["edit_upload_folder"].ToString() + "/";
        }

        //文件保存目录路径
        String savePath = "../../" + getConfigAppSettings("uploadFolder") + "/" + sessionUploadPath;
        //文件保存目录URL
        String saveUrl = aspxUrl + "../../" + getConfigAppSettings("uploadFolder") + "/" + sessionUploadPath;

        //定义允许上传的文件扩展名
        Hashtable extTable = new Hashtable();
        extTable.Add("image", "gif,jpg,jpeg,png,bmp");
        extTable.Add("flash", "swf,flv");
        extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
        extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

        //最大文件大小
        int maxSize = 2000000;//2m
        this.context = context;

        HttpPostedFile imgFile = context.Request.Files["imgFile"];
        if (imgFile == null)
        {
            showError("请选择文件。");
        }

        String dirPath = context.Server.MapPath(savePath);
        if (!Directory.Exists(dirPath))
        {
            Directory.CreateDirectory(dirPath);
        }

        String dirName = context.Request.QueryString["dir"] != null ? context.Request.QueryString["dir"] : "image";
        String fileName = imgFile.FileName;
        String fileExt = Path.GetExtension(fileName).ToLower();

        if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1)
        {
            showError("上传文件扩展名是不允许的扩展名。
只允许" + ((String)extTable[dirName]) + "格式。");
        }
        if (dirName == "image")
        {
            if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize)
            {
                showError("上传文件大小超过限制。");
            }
            if (!isPic(imgFile))
            {
                showError("上传文件不合法！");
            }
        }





        //创建文件夹
        //dirPath += dirName + "/";
        //saveUrl += dirName + "/";
        if (!Directory.Exists(dirPath))
        {
            Directory.CreateDirectory(dirPath);
        }
        String ymd = DateTime.Now.ToString("yyyyMM", DateTimeFormatInfo.InvariantInfo);
        dirPath += ymd + "/";
        saveUrl += ymd + "/";
        if (!Directory.Exists(dirPath))
        {
            Directory.CreateDirectory(dirPath);
        }
        
        //edit_upload_fileName
        //string sessionUploadFileName = string.Empty;
        //if (HttpContext.Current.Session["edit_upload_fileName"] != null)
        //{
        //    sessionUploadFileName = HttpContext.Current.Session["edit_upload_fileName"].ToString();
        //}
        //String newFileName = sessionUploadFileName + DateTime.Now.ToString("yyyyMMddHHmmssffff", DateTimeFormatInfo.InvariantInfo) + fileExt;
        //String filePath = dirPath + newFileName;
        //imgFile.SaveAs(filePath);
        //String fileUrl = saveUrl + newFileName;

        //水印start
        String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo);
        String filePath = dirPath + newFileName + fileExt;
        imgFile.SaveAs(filePath);
        String fileUrl = saveUrl + newFileName + fileExt;
        //添加文字水印
        Image image = System.Drawing.Image.FromFile(filePath);
        Graphics g = Graphics.FromImage(image);
        g.DrawImage(image, 0, 0, image.Width, image.Height);
        Font f = new Font("Verdana", 14);
        Brush b = new SolidBrush(Color.Red);
        string addText = "www.114390.com";
        g.DrawString(addText, f, b, 10, 10);
        g.Dispose();
        //保存加水印过后的图片,删除原始图片
        string newPath = dirPath + newFileName + "_new" + fileExt;
        image.Save(newPath);
        image.Dispose();
        if (File.Exists(filePath))
        {
            File.Delete(filePath);
        }
        fileUrl = saveUrl + newFileName + "_new" + fileExt;
        //水印end
        
        
        Hashtable hash = new Hashtable();
        hash["error"] = 0;
        hash["url"] = fileUrl;
        context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");
        context.Response.Write(JsonMapper.ToJson(hash));
        context.Response.End();
    }
    private string getConfigAppSettings(string keyName)
    {
        if (!string.IsNullOrEmpty(keyName))
        {
            return System.Configuration.ConfigurationManager.AppSettings[keyName];
        }
        return "";
    }
    private void showError(string message)
    {
        Hashtable hash = new Hashtable();
        hash["error"] = 1;
        hash["message"] = message;
        context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");
        context.Response.Write(JsonMapper.ToJson(hash));
        context.Response.End();
    }

    public bool IsReusable
    {
        get
        {
            return true;
        }
    }
    public bool isPic(HttpPostedFile imgFile)
    {
        int fileLen=imgFile.ContentLength;
        byte[] imgArray = new byte[fileLen];
        imgFile.InputStream.Read(imgArray, 0, fileLen);
        MemoryStream ms = new MemoryStream(imgArray);
        BinaryReader br = new BinaryReader(ms);
        string fileclass = "";
        byte buffer;
        try
        {
            buffer = br.ReadByte();
            fileclass = buffer.ToString();
            buffer = br.ReadByte();
            fileclass += buffer.ToString();
        }
        catch
        { }
        br.Close();
        ms.Close();
        //
        try
        {
            //读取上传的文件是否是图片对象，异常则删除图片
            System.Drawing.Image uploadedImg = System.Drawing.Image.FromStream(imgFile.InputStream);
            if (uploadedImg.Width < 1 || uploadedImg.Height < 1)
            {
                return false;
            }
            uploadedImg.Dispose();
        }
        catch
        {
            return false;
        }
        //
        FileExtension[] fileEx = { FileExtension.GIF, FileExtension.BMP, FileExtension.JPG, FileExtension.PNG};
        foreach (FileExtension fe in fileEx)
        {
            try
            {
                if (Int32.Parse(fileclass) == (int)fe)
                {
                    if (truePic(System.Text.Encoding.ASCII.GetString(imgArray)))
                    {
                        return true;
                    }
                    return false;
                }
            }
            catch
            { }

        }
        return false;
    }
    //判断上传文件中是否包含关键字
    public bool truePic(string str)
    {
        string sStr = ".getfolder|.createfolder|.deletefolder|.createdirectory|.deletedirectory|.saveas|wscript.shell|script.encode|server.|.createobject|execute|activexobject|language=|exec |insert |select |delete |update |truncate |declare |iframe |Response|Request(| Eval|Eval |Eval(|%Eval|script |using";
        string[] ck = sStr.Split('|');
        string strsql = str;
        for (int i = 0; i < ck.Length; i++)
        {
            if (str.IndexOf(ck[i]) != -1 || str.ToUpper().IndexOf(ck[i].ToUpper()) != -1)
            {
                return false;
            }
        }
        return true;
    }
    //文件类型
    public enum FileExtension
    {
        JPG = 255216,
        GIF = 7173,
        PNG = 13780,
        BMP = 6677,
        SWF = 6787,
        SWF2 = 7087,
        RAR = 8297,
        ZIP = 8075,
        DOC = 208207,
        DOCX = 8075,
        XLS = 208207,
        XLS2 = 198243,
        XLSX = 8075,
        //_7Z = 55122,
        // 255216 jpg;   
        // 7173 gif;   
        // 6677 bmp,   
        // 13780 png;   
        // 6787 swf   
        // 7790 exe dll,   
        // 8297 rar   
        // 8075 zip   
        // 55122 7z   
        // 6063 xml   
        // 6033 html   
        // 239187 aspx   
        // 117115 cs   
        // 119105 js   
        // 102100 txt   
        // 255254 sql  
        /*
        DOC = 208207,
        DOCX = 8075,
        XLS = 208207,
        XLSX = 8075,
        JS = 239187,
        TXT = 7067,
        MP3 = 7368,
        WMA = 4838,
        MID = 7784,
        */
    }
}