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Token and Configuration:
telegramAuthToken
: This is the authentication token required to communicate with the Telegram Bot API.webhookEndpoint
: This is the endpoint where Telegram will send updates.oneSecMailApiUrl
: This is the API endpoint to generate a random temporary email address.
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Event Listener and Handler:
addEventListener('fetch', event => {...})
: This adds an event listener for the 'fetch' event. This is a Cloudflare Worker specific API. When an HTTP request is made, this event listener will trigger the provided handler function.async function handleIncomingRequest(event) {...}
: This is the handler function that will process incoming HTTP requests.
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Request Handling:
- The handler function extracts information from the incoming request such as the URL, method, and path.
- It checks if the request method is POST and the path matches the webhook endpoint. If so, it processes the incoming Telegram update.
- If the request method is GET and the path is '/configure-webhook', it sets up the webhook with Telegram API by sending a request to
https://api.telegram.org/bot{token}/setWebhook
. - Otherwise, it returns a 404 Not Found response.
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Processing Telegram Updates:
async function processUpdate(update) {...}
: This function processes the Telegram update received from the webhook.- It checks if the update contains a message.
- If the message is '/start', it sends a welcome message to the user.
- If the message is '/generate_email', it generates a temporary email address using the
oneSecMailApiUrl
and sends it to the user. - If the message is '/fetchmail', it fetches emails for the previously generated temporary email address and sends them to the user.
- If the message is '/info', it sends developer information to the user.
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Sending Requests to Telegram API:
- The function uses
fetch()
to send requests to the Telegram API for various actions such as sending messages, setting webhooks, etc.
- The function uses
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Error Handling:
- The code includes error handling for failed API requests and invalid user input.
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Response Handling:
- The handler function returns appropriate HTTP responses to the client based on the request and processing results.
This code essentially sets up a Cloudflare Worker to act as a webhook for a Telegram bot. It handles incoming updates from Telegram, processes them based on predefined commands, and interacts with the Telegram API to send responses back to users.