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83 lines
3.0 KiB
83 lines
3.0 KiB
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Web;
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using System.IO;
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using Web.Core;
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namespace Web.IISUploadHandler {
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class UploadHandler : IHttpHandler {
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public bool IsReusable {
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get {
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return true;
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}
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}
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public void ProcessRequest(HttpContext httpcontext) {
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if(httpcontext.Request.Path.ToLower() == "/upload/") {
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this.ProcessUpload(httpcontext);
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} else if(httpcontext.Request.Path.ToLower().StartsWith("/data/")) {
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this.ProcessRetrieve(httpcontext);
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} else {
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throw new HttpException(403, "wrong url");
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}
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}
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private static string getFilePath(string md5, string extension) {
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foreach(char chr in (md5 + extension)) {
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if(!Char.IsLetterOrDigit(chr)) throw new HttpException(403, "wrong md5 or extension");
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}
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return Config.instance.storageDir + md5.PHPSubstring(0, 2) + Path.DirectorySeparatorChar + md5.PHPSubstring(2, 2) + Path.DirectorySeparatorChar + md5.PHPSubstring(4) + "." + extension;
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}
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private static void CreateDirectoryIfNotExists(DirectoryInfo directoryInfo) {
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if(!directoryInfo.Exists) {
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CreateDirectoryIfNotExists(directoryInfo.Parent);
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directoryInfo.Create();
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}
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}
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private void ProcessUpload(HttpContext context) {
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byte[] data = new byte[context.Request.InputStream.Length];
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if(context.Request.InputStream.Read(data, 0, (int)context.Request.InputStream.Length) != context.Request.InputStream.Length) {
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throw new FLocalException("File is not uploaded correctly");
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}
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string file_md5 = Util.md5(context.Request.InputStream);
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string md5 = Util.md5(file_md5 + " " + Config.instance.salt);
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if(md5 != context.Request.QueryString["signature"]) {
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throw new HttpException(403, "signature mismatch");
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}
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string filePath = getFilePath(file_md5, context.Request.QueryString["extension"]);
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CreateDirectoryIfNotExists((new FileInfo(filePath)).Directory);
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using(FileStream stream = new FileStream(filePath, FileMode.CreateNew)) {
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stream.Write(data, 0, data.Length);
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}
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context.Response.Write("OK");
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}
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private void ProcessRetrieve(HttpContext context) {
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string[] requestParts = context.Request.Path.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
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if(requestParts.Length != 2) throw new HttpException(403, "wrong url");
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string[] fileParts = requestParts[1].Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
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if(fileParts.Length != 2) throw new HttpException(403, "wrong url");
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string mime = Util.getMimeByExtension(fileParts[1]);
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if(mime == null) throw new FLocalException("unknown extension '" + fileParts[1] + "'");
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context.Response.ContentType = mime;
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context.Response.Cache.SetExpires(DateTime.Now.AddDays(10));
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context.Response.Cache.SetLastModified(DateTime.Now.AddYears(-1));
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context.Response.Cache.SetCacheability(HttpCacheability.Public);
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context.Response.TransmitFile(getFilePath(fileParts[0], fileParts[1]));
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}
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}
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}
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