<%@ WebHandler Language="C#" Class="uploadPDFImage" %>

using System;
using System.Web;
using System.Runtime.Serialization.Json;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Web.Services.Protocols;
using System.Security.Cryptography;
using System.Text;
using System.Web.SessionState;
using System.Data;

public class uploadPDFImage : IHttpHandler, IReadOnlySessionState {

    private string _baseurl = HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Authority + HttpContext.Current.Request.ApplicationPath.TrimEnd('/');


    public void ProcessRequest (HttpContext context) {
        result objRet = new result();
        DataContractJsonSerializer json = new DataContractJsonSerializer(objRet.GetType());
        context.Response.ContentType = "application/json;charset=utf-8";
        context.Response.AddHeader("Access-Control-Allow-Origin", "*");
        authPermission objAuth = new authPermission();

        if (!objAuth.isLogin())
        {
            objRet.ret = "no";
            objRet.err_code = "0001";
            objRet.message = "尚未登入，請登入後使用";
            json.WriteObject(context.Response.OutputStream, objRet);
            return;
        }

        string picFile = (context.Request["picFile"] == null) ? "" : context.Request["picFile"].ToString();
        string filename = (context.Request["filename"] == null) ? "" : context.Request["filename"].ToString();
        string filetype = (context.Request["filetype"] == null) ? "" : context.Request["filetype"].ToString();

        string fileClientName = globalClass.CreateCaseRandomCode(16);

        if (!(filetype == "image/jpeg" || filetype == "image/png" || filetype == "application/pdf" || filetype == "image/jpg")) {
            objRet.ret = "no";
            objRet.err_code = "0002";
            objRet.message = "不支援檔案格式為" + filetype;
            json.WriteObject(context.Response.OutputStream, objRet);
            return;
        }

        if (filetype == "application/pdf") {
            fileClientName = fileClientName + ".pdf";
        }

        if (filetype == "image/jpeg" || filetype == "image/jpg") {
            fileClientName = fileClientName + ".jpg";
        }

        if (filetype == "application/png") {
            fileClientName = fileClientName + ".png";
        }

        string filePath = string.Format("upload_files/{0}", fileClientName).Replace("/", "\\");

        string path = System.Web.HttpContext.Current.Server.MapPath("~/");

        globalClass.Base64ToFile(picFile, path + filePath);

        objRet.fileName = filename;
        objRet.fileLinkName = fileClientName;
        objRet.fileUrl = _baseurl + "/upload_files/" + fileClientName;
        objRet.fileType = filetype;
        objRet.ret = "yes";

        json.WriteObject(context.Response.OutputStream, objRet);
        return;
    }

    public class result
    {
        public string ret = "no";
        public string err_code = "0000";
        public string message = "";
        public string fileName = "";
        public string fileUrl = "";
        public string fileType = "";
        public string fileLinkName = "";
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}