[Unit]
Description=hadlink URL Shortener Redirect Daemon
After=network.target
Documentation=https://github.com/jbsco/hadlink

[Service]
Type=simple
ExecStart=/usr/local/bin/hadlink-redirect
User=hadlink
Group=hadlink

# Environment
Environment=HADLINK_STORAGE=/var/lib/hadlink/hadlink.db
Environment=HADLINK_MODE=redirect
Environment=HADLINK_PORT=8080
EnvironmentFile=-/etc/hadlink/hadlink.conf

# Security hardening
NoNewPrivileges=true
ProtectSystem=strict
ProtectHome=true
PrivateTmp=true
PrivateDevices=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
RestrictNamespaces=true
RestrictRealtime=true
RestrictSUIDSGID=true
MemoryDenyWriteExecute=true
LockPersonality=true

# Read-only access to storage
ReadOnlyPaths=/var/lib/hadlink

# Resource limits
MemoryMax=64M
CPUQuota=20%

# Restart policy
Restart=on-failure
RestartSec=5s

[Install]
WantedBy=multi-user.target