Download-Checksum

Scope

This project scans a folder for certain type of files, than takes its checksums and populate a sqlite database used by a Flask app to return files requested by its checksums. The database is kept updated by a script using inotify-tools.

There are three distinct elements:

• Script that populates a sqlite database with given files
• Flask app that takes a checksum and return the corresponding file
• Script monitoring a folder updating the database if necessary

Files into zip archives are extracted and checksummed.

SHA1 checksum is used but its easy to change.

Requirements

• Python 3.x
• sqlite3/unzip/inotify-tools packages installed

Instructions

1. Clone the repository
2. Copy the .env-example to .env and adjust the variables
3. Add some files to the db: find /path/to/scan -type f -exec ./add_file.sh {} \;
4. Run Flask app

Eventually copy the *.service files into the ~/.config/systemd/user/ folder, adjust the WorkingDirectory and enable the services:

• systemctl --user daemon-reload
• systemctl --user start checksum-download.service
• systemctl --user enable checksum-download.service
• systemctl --user start checksum-monitor.service
• systemctl --user enable checksum-monitor.service

Usage

Scan a folder: find /path/to/scan -type f -exec ./add_file.sh {} \;

Download file by its SHA1 checksum: wget http://localhost:5000/checksum-downloader/<checksum>