PHP crawler simulates logging into Tencent corporate mailbox

With the universalization of network services and the advent of the information age, crawlers have become an important means of information acquisition. Crawler technology can not only help us quickly obtain useful information on the Internet, but can also replace tedious manual operations in some scenarios. In actual work and life, we often need to log in to various websites, such as email services, social networks, network disks, etc. For crawler engineers, in many cases it is necessary to simulate logging into these websites to obtain more information. This article will introduce how to use PHP to write a crawler to simulate logging into Tencent corporate mailbox.

Tencent Enterprise Mailbox provides two login methods, the Web version and the desktop version. Here we choose the Web version for simulated login. The specific steps are as follows:

Step 1: Analyze the login process

The crawler simulates logging into a website. The main problem is to crack the login process. We need to understand the structure of the login page and the parameters for submitting the form. We can use the developer tools that come with the Chrome browser to analyze the structure of the login page, including the HTML structure and JavaScript code. Taking Tencent Enterprise Mailbox as an example, we can open the login page (https://exmail.qq.com/login) and press the F12 key to open the console.

The login page contains a form, which includes user name, password, verification code and other data. This data needs to be submitted to the server through HTTP POST requests for verification and processing. We can get the parameters and URL of the form submission by looking at the network request in the console.

Step 2: Write code

After understanding the login process and request parameters, we can use PHP to write a simulated login script. We first need to use cURL to implement an HTTP GET request, obtain the HTML code of the login page, and parse out the parameters of the form. Then use cURL to implement the HTTP POST request, submit the form data and obtain the response returned by the server.

The following is a code example:

<?php
$username = "your_username";
$password = "your_password";

// 首先获取登录页面，抓取表单参数
$ch = curl_init("https://exmail.qq.com/cgi-bin/loginpage");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);

preg_match('/input type="hidden" name="(.*)" value="(.*?)"/i', $output, $matches);

$postdata = array(
    "f" => "xhtml",
    $matches[1] => $matches[2],
    "uin" => $username,
    "pwd" => md5($password),
    "aliastype" => "sw",
    "is_cb" => "",
    "redirect_url" => "",
    "action" => "1-5-25-41-42-43-45",
    "groupid" => ""
);

$postdata = http_build_query($postdata);

// 提交表单数据，模拟登录
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://exmail.qq.com/cgi-bin/login");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_COOKIEJAR, "cookie.txt");
$output = curl_exec($ch);
curl_close($ch);

echo $output;
?>

In the above code, we first use cURL to implement an HTTP GET request, obtain the HTML code of the login page, and use regular expressions to parse out the parameters of the form. Then use cURL to implement the HTTP POST request, submit the form data and simulate login, and save the cookie after login. Finally, the response returned by the server is output.

Step 3: Parse the response data

After successful login, we need to parse the response returned by the server to obtain the login content and other useful information. For example, in Tencent Enterprise Mailbox, we can parse the email content and unread count through regular expressions. The following is a code example:

// 解析邮件内容
preg_match_all('/<div class="maillist_info_subject"><a href="(.*?)">(.*?)</a></div>s+<div class="maillist_info_time">(.*?)</div>/si', $output, $matches);
for ($i=0; $i<count($matches[0]); $i++) {
    echo "邮件标题：".$matches[2][$i]."<br/>";
    echo "发件时间：".$matches[3][$i]."<br/>";
    echo "<br/>";
}

// 解析未读数量
preg_match('/<span class="new_msg_num_count">(.*?)</span>/si', $output, $matches);
echo "未读邮件数量：".$matches[1]."<br/>";

In the above code, we use regular expressions to parse the mailing list and the number of unread messages, and output them to the page.

Summary

This article introduces how to use PHP to write a crawler to simulate logging into Tencent's corporate mailbox, and parse the response data returned by the server after a successful login. The sample code here can be applied to simulate logins on other websites. It should be noted that crawler technology is a legal means of obtaining information, but care must be taken not to infringe on the privacy and intellectual property rights of others.

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