#!/bin/bash
# setup_oracle_proxy.sh — DUNG 1 HTTP PROXY RIENG (tinyproxy) tren VM Ubuntu mien phi:
#   Oracle Always Free (2 VM AMD + 4 core ARM, FREE vinh vien, 10TB/thang) / Azure free / VPS bat ky.
#   -> IP SACH cua chinh ban, on dinh, MIEN PHI. Dung cho tool mail (proxies.txt).
#
# CHAY TREN VM DO (Ubuntu), bang sudo:
#     sudo bash setup_oracle_proxy.sh
#   tuy chon dat truoc:  PORT=8888 PUSER=tenban PPASS=matkhau   (khong dat = tu sinh ngau nhien)
# ----------------------------------------------------------------------------
set -e
PORT="${PORT:-8888}"
PUSER="${PUSER:-px$RANDOM}"
PPASS="${PPASS:-$(tr -dc A-Za-z0-9 </dev/urandom 2>/dev/null | head -c14)}"
[ -n "$PPASS" ] || PPASS="px$RANDOM$RANDOM"

echo "[*] Cai tinyproxy ..."
export DEBIAN_FRONTEND=noninteractive
apt-get update -y >/dev/null 2>&1 || true
apt-get install -y tinyproxy curl >/dev/null 2>&1

CONF=/etc/tinyproxy/tinyproxy.conf
[ -f "$CONF" ] || CONF=/etc/tinyproxy.conf
echo "[*] Ghi config: $CONF"
cat > "$CONF" <<EOF
User tinyproxy
Group tinyproxy
Port $PORT
Listen 0.0.0.0
Timeout 600
Allow 0.0.0.0/0
BasicAuth $PUSER $PPASS
ConnectPort 443
ConnectPort 563
StartServers 5
MaxClients 200
LogLevel Warning
EOF

echo "[*] Mo firewall TRONG VM (port $PORT) ..."
ufw allow "$PORT"/tcp >/dev/null 2>&1 || true
iptables -I INPUT -p tcp --dport "$PORT" -j ACCEPT 2>/dev/null || true
netfilter-persistent save >/dev/null 2>&1 || true

systemctl enable tinyproxy >/dev/null 2>&1 || true
systemctl restart tinyproxy
sleep 2
if systemctl is-active --quiet tinyproxy; then echo "[*] tinyproxy DANG CHAY OK"; else echo "[!] LOI: journalctl -u tinyproxy -n30"; fi

IP=$(curl -s --max-time 8 ifconfig.me 2>/dev/null || curl -s --max-time 8 icanhazip.com 2>/dev/null || echo "<PUBLIC_IP_VM>")
echo ""
echo "=================================================================="
echo "  PROXY SAN SANG (HTTP, co mat khau, CONNECT HTTPS OK):"
echo ""
echo "      http://$PUSER:$PPASS@$IP:$PORT"
echo ""
echo "  -> COPY dong tren vao proxies.txt cua tool mail (moi VM = 1 dong)."
echo ""
echo "  *** QUAN TRONG: PHAI mo port $PORT o tang CLOUD nua (neu khong, ben ngoai KHONG ket noi duoc"
echo "      du tinyproxy da chay): "
echo "      - Oracle: Networking -> VCN -> Security List -> Add Ingress: Source 0.0.0.0/0, IP Protocol TCP,"
echo "                Destination Port Range $PORT"
echo "      - Azure : VM -> Networking -> Add inbound port rule: port $PORT, Allow"
echo "=================================================================="
echo ""
echo "  TEST tu may khac:"
echo "      curl -x http://$PUSER:$PPASS@$IP:$PORT -I --max-time 12 https://login.live.com"
echo "  (thay 200/30x = OK)"