# gh-actions workflow to download from magnet links

# Usage
# 1. Place this file within .github/workflows in your GitHub repo and push.
# 2. Select this workflow from the Repo Actions tab, select Run Workflow,
#    add your Magnet URI(s), and wait a little while.
#
# This workflow produces a build artifact that contains URLs pointing to
# sequential *.tar.gz chunks you can download non-interactively with
# 'wget -i download.txt -O - | tar -xzv'.
# Catbox links and GitHub artifacts expire in 72 hours.
#
# Notes
# catbox.moe is used to fully utilize runner disk space limit of ~25GiB.
# actions/upload-artifact@v2 zips before uploading, reducing maximum effective
# space to ~12GiB if files were to be delivered as a build artifact.

name: Magnet Download by Proxy
on:
  workflow_dispatch:
    inputs:
      MAGNET_URI:
        type: string
        required: true
        description: Magnet Link/URI(s)
      SEED_MODE:
        type: boolean
        required: true
        default: true
        description: Continue seeding after downloading?

jobs:
  Download:
    runs-on: ubuntu-latest
    env:
      MAGNET: ${{ github.event.inputs.MAGNET_URI }}
      ARIA2C: aria2c -d dl --disable-ipv6 --force-sequential
    steps:
      - name: Install prerequisite(s)
        run: sudo apt-get install -y aria2 pigz
      - name: Download file(s)
        run: |
          mkdir dl
          $ARIA2C --seed-time=0 $MAGNET
      - name: Tarball file(s) in place
        run: |
          mkdir parts
          tar --remove-files -cv dl/ \
            | pigz -1 | split -db 1000M - parts/file.tar.gz.
      - name: Upload tarball chunk(s) to litterbox.catbox.moe
        run: |
          for f in parts/*; do
            curl -f --retry 10 --retry-delay 60 \
              -F 'reqtype=fileupload' -F 'time=72h' -F "fileToUpload=@$f" \
              'https://litterbox.catbox.moe/resources/internals/api.php'
            printf '\n'
          done | tee /dev/stderr > download.txt
          printf '\n\e[1m%s\e[0m\n' 'Download List'
          cat download.txt
      - name: Upload file URL list as artifact
        uses: actions/upload-artifact@v2
        with:
          name: artifact
          path: download.txt
          retention-days: 3
      - name: Seed after downloading (end workflow to obtain artifact)
        if: ${{ github.event.inputs.SEED_MODE == 'true' }}
        run: |
          for f in parts/*; do
            cat "$f"; rm "$f"
          done | pigz -d | tar -xv
          $ARIA2C -V -c $MAGNET || :