#!/bin/bash
# 自己去回调地址取证书，不依赖 cloudflared 的下载。
#
# cloudflared 报 "Failed to fetch resource" 说明它连不上那个回调。
# 但回调地址是公开可访问的（浏览器就是这么拿到证书的）——
# 我们自己 curl 一下，说不定能拿到。
set -u

echo "===== 1. 当前登录会话和回调地址 ====="
URL=$(grep -oE 'https://dash\.cloudflare\.com/argotunnel[^ ]+' /root/cf_login.log 2>/dev/null | tail -1)
echo "  授权网址:"
echo "    ${URL:-（没有）}"

# 从授权网址里把 callback 参数解出来
CALLBACK=$(echo "$URL" | grep -oE 'callback=[^&]*' | cut -d= -f2-)
if [ -n "$CALLBACK" ]; then
    # URL 解码
    DECODED=$(printf '%b' "${CALLBACK//%/\\x}")
    echo
    echo "  回调地址（解码后）:"
    echo "    $DECODED"
else
    echo "  解析不出回调地址"
    DECODED=""
fi

echo
echo "===== 2. cloudflared 进程还在吗 ====="
pgrep -a -f 'cloudflared tunnel login' || echo "  进程已退出"

echo
echo "===== 3. 直接去取证书 ====="
if [ -n "$DECODED" ]; then
    OUT=/root/cert_from_callback.pem
    CODE=$(timeout 25 curl -4 -s -o "$OUT" -w '%{http_code}' "$DECODED" 2>/dev/null)
    echo "  HTTP $CODE"
    echo "  文件大小: $(stat -c %s "$OUT" 2>/dev/null || echo 0) 字节"
    if [ -s "$OUT" ]; then
        echo "  内容开头:"
        head -3 "$OUT" | sed 's/^/    /'
    fi
fi

echo
echo "===== 4. 试试 cloudflare 的证书接口 ====="
for path in \
    "https://api.cloudflare.com/client/v4/certificates" \
    "https://api.cloudflare.com/client/v4/user/tokens/verify" ; do
    C=$(timeout 15 curl -4 -s -o /dev/null -w '%{http_code}' "$path" 2>/dev/null)
    printf "  %-62s -> %s\n" "$path" "${C:-超时}"
done

echo
echo "===== 5. 结论 ====="
if [ -n "$DECODED" ]; then
    SIZE=$(stat -c %s /root/cert_from_callback.pem 2>/dev/null || echo 0)
    if [ "$SIZE" -gt 500 ]; then
        echo "  ✓ 取到了证书（$SIZE 字节）—— 可以手动放到 /root/.cloudflared/cert.pem"
    else
        echo "  ✗ 没取到（$SIZE 字节）"
        echo "    说明回调需要浏览器带的 Cookie，命令行取不了。"
        echo
        echo "    那就只能走浏览器下载那条路："
        echo "      重新授权后，页面上会有下载按钮，把 cert.pem 存下来。"
    fi
fi