PDF logging and send automatically by telegram bot

[Spirit-crypto]

How to save log information to pdf and send it users automatically?
In addition, which modules are essential for this?

[phoenixdev0117]

To save log information to PDF and send it to users automatically in Node.js, you'll need to follow these steps:

• Generate a PDF from log data
• Save the PDF file
• Send the PDF to users via email
  Here are the essential modules for this task:
• pdfkit: For creating PDF documents
• nodemailer: For sending emails with attachments
• fs: For file system operations (built-in Node.js module)

[whalesharka1129]

This method can be more lightweight and scalable. Here's an alternative implementation:

• Use a logging library to save logs to a text file
• Upload the log file to a cloud storage service (e.g., AWS S3)
• Generate a temporary download link
• Send the link to users via email or Telegram

Essential modules for this approach:

• winston: For advanced logging
• @aws-sdk/client-s3: For interacting with AWS S3
• @aws-sdk/s3-request-presigner: For generating temporary S3 URLs
• nodemailer: For sending emails (if using email)
• node-telegram-bot-api: For sending messages via Telegram (if using Telegram)

[fiready126]

This method allows users to access logs through a web interface. Here's how we can implement this:

• Use a lightweight database (SQLite) to store logs
• Create a simple Express.js web server to serve logs
• Implement a basic authentication system
• Send notifications to users with a link to view logs

Essential modules for this approach:

• sqlite3: For database operations
• express: For creating a web server
• ejs: For templating
• bcrypt: For password hashing
• jsonwebtoken: For JWT-based authentication
• nodemailer: For sending email notifications
• node-telegram-bot-api: For sending Telegram notifications

[phoenixdev0117]

To save log information to PDF and send it to users automatically in Node.js, you'll need to follow these steps:

• Generate a PDF from log data
• Save the PDF file
• Send the PDF to users by bot sendDocument method.

Here are the essential modules for this task:

• pdfkit: For creating PDF documents
• node-telegram-bot-api: telegram bot module
• fs: For file system operations (built-in Node.js module)

Code

• logging pdf:

import fs from 'fs';
import PDFDocument from 'pdfkit';

class PDFLogger {
  private doc: PDFKit.PDFDocument; // PDF Document instance
  private stream: fs.WriteStream; // Write stream for the PDF file
  private filePath: string;       // Path to save the PDF file

  constructor(filePath: string) {
    this.filePath = filePath;

    // Ensure the directory exists
    const dir = this.filePath.substring(0, this.filePath.lastIndexOf('/'));
    if (!fs.existsSync(dir)) {
      fs.mkdirSync(dir, { recursive: true }); // Create directories if they don't exist
    }

    // Create a PDF document
    this.doc = new PDFDocument();
    this.stream = fs.createWriteStream(this.filePath);

    // Pipe the PDF document to the file stream
    this.doc.pipe(this.stream);
    this.doc.fontSize(12).text('Log File for Balances\n\n', { underline: true });
  }

  // Method to log a message
  log(message: string): void {
    // const timestamp = new Date().toISOString(); // Add timestamp
    this.doc.fontSize(10).text(`${message}`);
    console.log(`[LOG]: ${message}`); // Optional: Console log for debugging
  }

  // Method to finalize and save the PDF
  end(): void {
    this.doc.end(); // Finalize the PDF file
    this.stream.end(); // Close the stream
  }
}

export default PDFLogger;

• bot send document:

export const BotSendDocument = (filePath : string, filename : string) =>{
  
  bot.sendDocument(chatId ?? 0, filePath, {
    caption: 'Here is Log PDF file'
  }, {
    filename: filename,
    contentType: 'application/pdf'
  });
}