C# 实现百度搜索算法逆向

using System;
using System.Net.Http;
using System.Threading.Tasks;

class BaiduSearch
{
    private static readonly HttpClient client = new HttpClient();

    public static async Task<string> SearchAsync(string keyword)
    {
        string url = $"https://www.baidu.com/s?wd={Uri.EscapeDataString(keyword)}";
        HttpResponseMessage response = await client.GetAsync(url);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
}

using System.Security.Cryptography;
using System.Text;

static string GenerateSign(string input)
{
    using (MD5 md5 = MD5.Create())
    {
        byte[] inputBytes = Encoding.UTF8.GetBytes(input);
        byte[] hashBytes = md5.ComputeHash(inputBytes);
        StringBuilder sb = new StringBuilder();
        foreach (byte b in hashBytes)
        {
            sb.Append(b.ToString("x2"));
        }
        return sb.ToString();
    }
}

using HtmlAgilityPack;

static void ParseSearchResults(string html)
{
    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(html);
    var nodes = doc.DocumentNode.SelectNodes("//div[contains(@class, 'result')]");
    if (nodes != null)
    {
        foreach (var node in nodes)
        {
            string title = node.SelectSingleNode(".//h3/a")?.InnerText;
            string link = node.SelectSingleNode(".//h3/a/@href")?.GetAttributeValue("href", "");
            string snippet = node.SelectSingleNode(".//div[contains(@class, 'c-abstract')]")?.InnerText;
            Console.WriteLine($"Title: {title}\nLink: {link}\nSnippet: {snippet}\n");
        }
    }
}

static async Task Main(string[] args)
{
    string keyword = "算法逆向";
    string html = await BaiduSearch.SearchAsync(keyword);
    ParseSearchResults(html);
}