$ show Neet-Nestor/Telegram-Media-Downloader
This repository is a single-file userscript (Tampermonkey/Greasemonkey) that adds download buttons to the Telegram webapp for images, GIFs, videos, and audio messages, even in channels where downloading is disabled. The script runs via polling (setInterval) to detect media viewers and inject buttons. It downloads videos and audio using chunked HTTP range requests, assembling the parts into a Blob or using the File System Access API for streaming writes. Images are downloaded directly via anchor element click. The code is self-contained, with no external dependencies, and includes a progress bar for video downloads. The architecture is a classic userscript pattern: DOM manipulation via polling, with carefully crafted download logic that handles large files and supports both standard and restricted content. The script is actively maintained, with frequent updates and a large user base (5.4k+ stars).
The LLM identified 1 files worth highlighting for reuse:
The core download functions (tel_download_video, tel_download_audio, tel_download_image) implement a reusable pattern for downloading large media files via chunked HTTP range requests. They handle partial responses, reassemble blobs, and offer a fallback between the File System Access API (showSaveFilePicker) and in-memory blob assembly. The pattern includes error handling for gaps, MIME type validation, and progress tracking. These functions can be extracted and adapted for any browser-based downloader that needs to fetch large files in chunks without server-side support for streaming downloads.