c#爬虫-1688官网自动以图搜图

背景

在1688有个功能，就是上传图片，就可以找到类似的商品。如下

网址：https://www.1688.com/

这时候，我们可以使用程序来代替，大批量的完成图片上传功能。

实现思路

1、找到图片上传接口

post请求，form表单中有signature签名

2、再找sign生成接口，全局搜素找一下signature，发现了一个返回signature的接口。

接口链接：https://open-s.1688.com/openservice/ossDataService

这个接口也有一个变动的参数 appKey

全局搜索后在js文件中查看一下

往下找就可以发现appkey的生成了。

通过debug来查看生成规则。

获取加密时间的接口：https://open-s.1688.com/openservice/.htm?
参数：outfmt =json&serviceIds=cbu.searchweb.config.system.currenttime

需要先请求这个接口，获取加密时间。

   private void go(string parhfile){var response = HttpHelper.CreateGetHttpResponse("https://open-s.1688.com/openservice/.htm?serviceIds=cbu.searchweb.config.system.currenttime&outfmt=json", 5000, null, null);Stream myResponseStream = response.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();if (response.StatusCode == HttpStatusCode.OK){var ss = JsonConvert.DeserializeObject<Currenttimemodel>(retString.Replace("cbu.searchweb.config.system.currenttime", "currenttime"));//  SetText("加密时间:" + ss.currenttime.dataSet.ToString());getsin(ss.currenttime.dataSet.ToString(), parhfile);}else{SetText("错误代码：" + response.StatusCode.ToString());}}

再把时间和appName 传入 getAppKey。

然后e= “appname ; t” ，appName的base64编码之后的结果是 “cGNfdHVzb3U=”

经过encode64返回 i ( appkey)

然后通过上面生成sign的接口：https://open-s.1688.com/openservice/ossDataService

传入参数就行请求，就可以返回signature，policy，accessid。

params = {"appName": key,"appKey": base64.b64encode(appkey.encode("utf-8")),}

  /// <summary>/// sign生成接口/// </summary>/// <param name="dataSet"></param>private void getsin(string dataSet, string parhfile){string appName = "pc_tusou";//getAppKeystring appKey = Base64.EncodeBase64("utf-8", appName + ";" + dataSet.ToString());var response = HttpHelper.CreateGetHttpResponse("https://open-s.1688.com/openservice/ossDataService?appName=" + appName + "&appKey=" + appKey, 5000, null, null);Stream myResponseStream = response.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();if (response.StatusCode == HttpStatusCode.OK){var ss = JsonConvert.DeserializeObject<Rootsin>(retString);//  SetText("sign:" + ss.data.signature);string key = "cbuimgsearch/" + Base64.Getimgname() + Base64.GetTimeStamp() + ".jepg";var client = new RestClient("https://cbusearch.oss-cn-shanghai.aliyuncs.com/");client.Timeout = -1;var request = new RestRequest(Method.POST);request.AddHeader("Origin", "https://www.1688.com");client.UserAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36";request.AddHeader("Accept", "*/*");request.AddHeader("Cache-Control", "no-cache");request.AddHeader("cookie", "_samesite_flag_=true; _tb_token_=ee5138b911917; cookie2=163f6e3722351213514df4c9ab9116f6; t=96e8d0ab6d636f19306c429b276db552; __cn_logon__=false; ali_ab=120.253.224.246.1587973275662.6; l=caJGIJNTkgnFkWiGkSYyeKDwPQuOAiFJdcPgDahIhDlFGpKMvULclIQGPBDmDhmDdCsLYIU; na=ijBRbdRXZeKwRcTHilfNHSt+; ");request.AddHeader("refer", "https://www.1688.com/");request.AddParameter("name", Base64.Getname() + ".jpeg");request.AddParameter("key", key);request.AddParameter("OSSAccessKeyId", ss.data.accessid);request.AddParameter("callback", "");request.AddParameter("policy", ss.data.policy);request.AddParameter("signature", ss.data.signature);request.AddParameter("success_action_status", "200");request.AddFile("file", parhfile);IRestResponse response2 = client.Execute(request);Console.WriteLine(response2.Content);if (response2.StatusCode == HttpStatusCode.OK){string picurl = "https://s.1688.com/youyuan/index.htm?tab=imageSearch&imageType=oss&imageAddress=" + key + "&spm=";SetText3("\r\n" + picurl);Write(picurl);}else{SetText("错误代码：" + response2.StatusCode.ToString());}}else{SetText("错误代码：" + response.StatusCode.ToString());}}

3、数据详情接口

图片上传之后，返回的数据接口：
https://search.1688.com/service/imageSearchOfferResultViewService?

参数：

imageAddress是在上传图片之后返回的值
requestId 初始化参数，可以为空。
整个流程就是这样了，接着构造请求就可以获取数据了。

完整代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Newtonsoft.Json;
using Reptiles1688;
using RestSharp;namespace WindowsFormsApp1
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){ThreadPool.QueueUserWorkItem(new WaitCallback(crawlingWeb), "test");}public void Write(string s){string path = System.Environment.CurrentDirectory + "\\图片url\\" + Guid.NewGuid().ToString();if (!Directory.Exists(path))Directory.CreateDirectory(path);FileStream fs = new FileStream(path + "\\data.txt", FileMode.Create);//获得字节数组byte[] data = System.Text.Encoding.Default.GetBytes(s);//开始写入fs.Write(data, 0, data.Length);//清空缓冲区、关闭流fs.Flush();fs.Close();}private delegate void SetLabelDelegate(string value);private void SetText(string value){if (this.InvokeRequired){SetLabelDelegate d = new SetLabelDelegate(SetText);this.Invoke(d, new object[] { value });}else{textBox1.Text = value.ToString() + textBox1.Text;}}private delegate void SetLabelDelegate3(string value);private void SetText3(string value){if (this.InvokeRequired){SetLabelDelegate3 d = new SetLabelDelegate3(SetText3);this.Invoke(d, new object[] { value });}else{textBox3.Text = value.ToString() + textBox3.Text;}}private void crawlingWeb(object data){for (int aa = 1; aa < 50; aa++){//  SetText3(aa.ToString());for (int a = 1; a < 4; a++){string ss = "D:\\pppppppppppppp\\" + a + ".jpg";//  SetText3(aa.ToString() + "-" + a);go(ss);Thread.Sleep(500);}}SetText3("\r\n ok");}private void go(string parhfile){var response = HttpHelper.CreateGetHttpResponse("https://open-s.1688.com/openservice/.htm?serviceIds=cbu.searchweb.config.system.currenttime&outfmt=json", 5000, null, null);Stream myResponseStream = response.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();if (response.StatusCode == HttpStatusCode.OK){var ss = JsonConvert.DeserializeObject<Currenttimemodel>(retString.Replace("cbu.searchweb.config.system.currenttime", "currenttime"));//  SetText("加密时间:" + ss.currenttime.dataSet.ToString());getsin(ss.currenttime.dataSet.ToString(), parhfile);}else{SetText("错误代码：" + response.StatusCode.ToString());}}/// <summary>/// sign生成接口/// </summary>/// <param name="dataSet"></param>private void getsin(string dataSet, string parhfile){string appName = "pc_tusou";//getAppKeystring appKey = Base64.EncodeBase64("utf-8", appName + ";" + dataSet.ToString());var response = HttpHelper.CreateGetHttpResponse("https://open-s.1688.com/openservice/ossDataService?appName=" + appName + "&appKey=" + appKey, 5000, null, null);Stream myResponseStream = response.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();if (response.StatusCode == HttpStatusCode.OK){var ss = JsonConvert.DeserializeObject<Rootsin>(retString);//  SetText("sign:" + ss.data.signature);string key = "cbuimgsearch/" + Base64.Getimgname() + Base64.GetTimeStamp() + ".jepg";var client = new RestClient("https://cbusearch.oss-cn-shanghai.aliyuncs.com/");client.Timeout = -1;var request = new RestRequest(Method.POST);request.AddHeader("Origin", "https://www.1688.com");client.UserAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36";request.AddHeader("Accept", "*/*");request.AddHeader("Cache-Control", "no-cache");request.AddHeader("cookie", "_samesite_flag_=true; _tb_token_=ee5138b911917; cookie2=163f6e3722351213514df4c9ab9116f6; t=96e8d0ab6d636f19306c429b276db552; __cn_logon__=false; ali_ab=120.253.224.246.1587973275662.6; l=caJGIJNTkgnFkWiGkSYyeKDwPQuOAiFJdcPgDahIhDlFGpKMvULclIQGPBDmDhmDdCsLYIU; na=ijBRbdRXZeKwRcTHilfNHSt+; ");request.AddHeader("refer", "https://www.1688.com/");request.AddParameter("name", Base64.Getname() + ".jpeg");request.AddParameter("key", key);request.AddParameter("OSSAccessKeyId", ss.data.accessid);request.AddParameter("callback", "");request.AddParameter("policy", ss.data.policy);request.AddParameter("signature", ss.data.signature);request.AddParameter("success_action_status", "200");request.AddFile("file", parhfile);IRestResponse response2 = client.Execute(request);Console.WriteLine(response2.Content);if (response2.StatusCode == HttpStatusCode.OK){string picurl = "https://s.1688.com/youyuan/index.htm?tab=imageSearch&imageType=oss&imageAddress=" + key + "&spm=";SetText3("\r\n" + picurl);Write(picurl);}else{SetText("错误代码：" + response2.StatusCode.ToString());}}else{SetText("错误代码：" + response.StatusCode.ToString());}}}
}