This code automates Facebook login using Puppeteer. It first checks if the user is already logged in, and if not, it fills in the username and password, submits the form, and handles potential CAPTCHAs.

Run example

npm run import -- "Log in to facebook"

Log in to facebook

function enterFacebook() {
    console.log('Facebook: Sign in required');
    var credentials = getCredentials('facebook.com');
    return client.click('input[name*="email"]')
        .keys(credentials.username)
        .pause(1000)
        .then(() => console.log('Facebook: Require password'))
        .click('input[name*="pass"]')
        .keys(credentials.password)
        .submitForm('[type="submit"]')
        .pause(2000)
        .isExisting('.cp-challenge-form')
        .then(is => {
            if (is) {
                throw new Error('captcha');
            }
        });
}

function loginFacebook() {
    return client
        .getUrl()
        .then(url => {
            var loggedIn = url.indexOf('facebook') > -1 && url.indexOf('login') === -1;
            return loggedIn
                ? client
                    .isVisible('input[name*="email"]')
                    .then(is => is ? enterFacebook() : client)
                : client.url('https://www.facebook.com/')
                    .isVisible('input[name*="email"]')
                    .then(is => is ? enterFacebook() : client)
        })
}
module.exports = loginFacebook;
loginFacebook;

/**
 * Attempts to log in to Facebook using the provided credentials.
 * 
 * @returns {Promise<Client>} The client instance if successful, or throws an error if a CAPTCHA is encountered.
 */
function enterFacebook() {
    console.log('Facebook: Sign in required');
    
    // Get credentials from external function or object
    const credentials = getCredentials('facebook.com');
    
    // Click on the email input field
    return client
       .click('input[name*="email"]')
        // Type in the username
       .keys(credentials.username)
       .pause(1000) // Pause for 1 second to allow the username to be typed in
       .then(() => console.log("Facebook: Require password"))
        // Click on the password input field
       .click('input[name*="pass"]')
        // Type in the password
       .keys(credentials.password)
        // Submit the form
       .submitForm('[type="submit"]')
        // Pause for 2 seconds to allow the form to be submitted
       .pause(2000)
        // Check if a CAPTCHA is present
       .isExisting('.cp-challenge-form')
       .then(is => {
            if (is) {
                throw new Error('captcha');
            }
            // If no CAPTCHA is present, return the client instance
            return client;
        });
}

/**
 * Attempts to log in to Facebook using the provided credentials.
 * 
 * @returns {Promise<Client>} The client instance if successful.
 */
function loginFacebook() {
    try {
        // Get the current URL
        return client
           .getUrl()
           .then(url => {
                // Check if the user is already logged in
                const loggedIn = url.indexOf('facebook') > -1 && url.indexOf('login') === -1;
                // If logged in, check if the email input field is visible
                return loggedIn
                   ? client
                       .isVisible('input[name*="email"]')
                       .then(is => is? enterFacebook() : client)
                    : client.url('https://www.facebook.com/')
                       .isVisible('input[name*="email"]')
                       .then(is => is? enterFacebook() : client);
            });
    } catch (error) {
        // If an error occurs, log it and return null
        console.error(error);
        return null;
    }
}

module.exports = loginFacebook;

This code snippet defines two functions, enterFacebook and loginFacebook, designed to automate the process of logging into a Facebook account using Selenium.

enterFacebook Function:

1. Log Message: Prints a message to the console indicating that Facebook sign-in is required.
2. Get Credentials: Retrieves Facebook login credentials (username and password) from a function called getCredentials (not shown in the snippet).
3. Fill Username:
   • Finds the email input field on the Facebook login page using the selector input[name*="email"].
   • Enters the retrieved username into the field.
4. Pause: Waits for 1 second.
5. Log Password:
   • Finds the password input field using the selector input[name*="pass"].

Functionality Breakdown:

1. enterFacebook() Function:

   • Logs a message indicating sign-in is required.
   • Retrieves credentials (username and password) for Facebook using getCredentials('facebook.com').
   • Uses a Puppeteer client (client) to automate interactions:
     • Clicks the email input field.
     • Types the username into the email field.
     • Pauses for 1 second.
     • Logs a message indicating the password is required.
     • Clicks the password input field.
     • Types the password into the password field.
     • Submits the login form.
     • Pauses for 2 seconds.
     • Checks if a CAPTCHA form exists (.cp-challenge-form).
     • If a CAPTCHA is found, throws an error.

2. loginFacebook() Function:

   • Gets the current URL using the Puppeteer client.
   • Checks if the user is already logged in by looking for "facebook" in the URL and the absence of "login".
   • If logged in, checks if the email input field is visible. If visible, calls enterFacebook().
   • If not logged in, navigates to the Facebook login page and checks if the email input field is visible. If visible, calls enterFacebook().

3. Module Export:

   • Exports the loginFacebook() function as the main function to be used.

Purpose:

This code automates the process of logging into Facebook using Puppeteer. It handles both scenarios: logging in when not logged in and handling potential CAPTCHAs.

Let me know if you have any other questions.