How to configure a webhook using a self-signed certificate for a Telegram bot?

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1

Hey everyone,

I’m trying to set up a webhook for my Telegram bot using a self-signed certificate. I heard Telegram recently added support for this, but I’m not sure how to go about it.

Here’s what I’ve tried so far:

import requests

bot_token = 'your_bot_token_here'
webhook_url = 'https://your_domain.com/webhook'
cert_path = '/path/to/your/certificate.pem'

with open(cert_path, 'rb') as cert_file:
    cert_data = cert_file.read()

response = requests.post(
    f'https://api.telegram.org/bot{bot_token}/setWebhook',
    data={'url': webhook_url},
    files={'certificate': cert_data}
)

print(response.json())

But I’m getting an error. Any ideas on what I’m doing wrong or how to properly send the certificate to Telegram? Thanks in advance for any help!

2

yo, i had similar issues. make sure ur cert is valid and matches the domain. also, try using the official telegram bot API instead of requests. it’s way easier.

oh, and check ur server’s firewall. sometimes it blocks the webhook port. good luck man!

3

I’ve dealt with this exact issue before, and it can be tricky. One thing that’s not immediately obvious is that Telegram is quite picky about the certificate format. Make sure your self-signed cert is using SHA-256 for the signature algorithm and has a 2048-bit RSA key.

Also, double-check your server’s time synchronization. I once spent hours debugging only to realize my server clock was off, causing certificate validation failures.

If you’re still stuck, try using OpenSSL to verify your certificate chain:

openssl verify -CAfile /path/to/your/ca.crt /path/to/your/certificate.pem

This can help identify any issues with your certificate setup. Remember, the domain in your cert must exactly match your webhook URL. Even a small mismatch will cause problems.

Lastly, don’t forget to check Telegram’s response when setting the webhook. It usually provides helpful error messages if something’s amiss.

4

I’ve been through this process recently, and I can share what worked for me. The code you’ve provided looks close, but there are a few tweaks you might need to make.

First, ensure your self-signed certificate is in PEM format and includes the entire certificate chain. Also, double-check that your webhook URL is using HTTPS and matches the domain in your certificate.

One thing that caught me out was the file upload. Try specifying the filename explicitly:

files={'certificate': ('cert.pem', cert_data, 'application/x-pem-file')}

If you’re still facing issues, consider using the telegram Python library instead of requests. It handles a lot of these intricacies for you.

Lastly, make sure your server is correctly configured to handle HTTPS requests and that your firewall isn’t blocking incoming connections on the webhook port. Good luck!