cloudflared + dufs to share files, sends URL to telegram chat

tunnel.yaml

services:
  fileserver:
    image: sigoden/dufs
    command: /srv --allow-search --allow-archive --compress none -p 80
    volumes:
      # dir to share
      - /downloads:/srv:ro

  tunnel:
    image: alpine:latest
    depends_on:
      - fileserver
    env_file:
      # should look like this
      # TG_BOT_TOKEN=123456:ABC
      # TG_CHAT_ID=123456
      - .env
    command:
      # amd64 / aarch64
      - /bin/sh
      - -c
      - |
        apk add --no-cache curl
        wget -q "https://github.com/cloudflare/cloudflared/releases/latest/download/cloudflared-linux-amd64" -O /usr/local/bin/cloudflared
        chmod +x /usr/local/bin/cloudflared
        last_url=""
        cloudflared tunnel --no-autoupdate --url http://fileserver:80 2>&1 | while read line; do
          echo "$$line"
          url=$$(echo "$$line" | grep -o 'https://[^[:space:]]*\.trycloudflare\.com' || true)
          if [ -n "$$url" ] && [ "$$url" != "$$last_url" ]; then
            curl -sf "https://api.telegram.org/bot$${TG_BOT_TOKEN}/sendMessage" \
              -d "chat_id=$${TG_CHAT_ID}" \
              -d "text=$$url"
            last_url="$$url"
          fi
        done