CrawlerHandler.cs
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using Microsoft.AspNetCore.Http;
using System;
using System.IO;
using System.Linq;
using System.Net;
namespace UEditorNetCore.Handlers
{
public class CrawlerHandler : Handler
{
private string[] Sources;
private Crawler[] Crawlers;
public CrawlerHandler(HttpContext context) : base(context) { }
public override void Process()
{
Sources = Request.Form["source[]"];
if (Sources == null || Sources.Length == 0)
{
WriteJson(new
{
state = "参数错误：没有指定抓取源"
});
return;
}
Crawlers = Sources.Select(x => new Crawler(x).Fetch()).ToArray();
WriteJson(new
{
state = "SUCCESS",
list = Crawlers.Select(x => new
{
state = x.State,
source = x.SourceUrl,
url = x.ServerUrl
})
});
}
}
public class Crawler
{
public string SourceUrl { get; set; }
public string ServerUrl { get; set; }
public string State { get; set; }
// private HttpServerUtility Server { get; set; }
public Crawler(string sourceUrl)
{
this.SourceUrl = sourceUrl;
// this.Server = server;
}
public Crawler Fetch()
{
if (!IsExternalIPAddress(this.SourceUrl))
{
State = "INVALID_URL";
return this;
}
var request = HttpWebRequest.Create(this.SourceUrl) as HttpWebRequest;
using (var response = request.GetResponseAsync().Result as HttpWebResponse)
{
if (response.StatusCode != HttpStatusCode.OK)
{
State = "Url returns " + response.StatusCode + ", " + response.StatusDescription;
return this;
}
if (response.ContentType.IndexOf("image") == -1)
{
State = "Url is not an image";
return this;
}
ServerUrl = PathFormatter.Format(Path.GetFileName(this.SourceUrl), Config.GetString("catcherPathFormat"));
//var savePath = Path.Combine(Config.WebRootPath, ServerUrl);
var savePath = Path.Combine(Config.GetString("catcherSaveAbsolutePath"), ServerUrl);
//
try
{
var stream = response.GetResponseStream();
//
if (Config.GetValue<bool>("catcherFtpUpload"))
{
var fileExt = ServerUrl.Substring(savePath.LastIndexOf('.')).TrimStart('.');
var key = Config.GetString("catcherPathFormat") + "." + fileExt;
//FtpUpload.UploadFile(stream, savePath, Consts.ImgFtpServer.ip,
// Consts.ImgFtpServer.account, Consts.ImgFtpServer.pwd);
AliyunOssUpload.UploadFile(Consts.AliyunOssServer.AccessEndpoint,
Consts.AliyunOssServer.AccessKeyId, Consts.AliyunOssServer.AccessKeySecret,
Consts.AliyunOssServer.BucketName, key, fileExt, stream);
}
else
{
if (!Directory.Exists(Path.GetDirectoryName(savePath)))
{
Directory.CreateDirectory(Path.GetDirectoryName(savePath));
}
var reader = new BinaryReader(stream);
byte[] bytes;
using (var ms = new MemoryStream())
{
byte[] buffer = new byte[4096];
int count;
while ((count = reader.Read(buffer, 0, buffer.Length)) != 0)
{
ms.Write(buffer, 0, count);
}
bytes = ms.ToArray();
}
File.WriteAllBytes(savePath, bytes);
}
State = "SUCCESS";
}
catch (Exception e)
{
State = "抓取错误：" + e.Message;
}
return this;
}
}
private bool IsExternalIPAddress(string url)
{
var uri = new Uri(url);
switch (uri.HostNameType)
{
case UriHostNameType.Dns:
var ipHostEntry = Dns.GetHostEntryAsync(uri.DnsSafeHost).Result;
foreach (IPAddress ipAddress in ipHostEntry.AddressList)
{
byte[] ipBytes = ipAddress.GetAddressBytes();
if (ipAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
if (!IsPrivateIP(ipAddress))
{
return true;
}
}
}
break;
case UriHostNameType.IPv4:
return !IsPrivateIP(IPAddress.Parse(uri.DnsSafeHost));
}
return false;
}
private bool IsPrivateIP(IPAddress myIPAddress)
{
if (IPAddress.IsLoopback(myIPAddress)) return true;
if (myIPAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
byte[] ipBytes = myIPAddress.GetAddressBytes();
// 10.0.0.0/24
if (ipBytes[0] == 10)
{
return true;
}
// 172.16.0.0/16
else if (ipBytes[0] == 172 && ipBytes[1] == 16)
{
return true;
}
// 192.168.0.0/16
else if (ipBytes[0] == 192 && ipBytes[1] == 168)
{
return true;
}
// 169.254.0.0/16
else if (ipBytes[0] == 169 && ipBytes[1] == 254)
{
return true;
}
}
return false;
}
}
}