最近遇到一个需求，一个只能内网访问的网站，需要限制ip访问。就是网站内的部分文章只有白名单内的ip才能打开。因为是静态化的网站，所有文章都是静态html页面。所以首先想到的就是直接js获取访问者ip然后再判断是否在白名单内，不在白名单内就到没有权限页面。
但是JS获取内网Ip还是比较麻烦的，查到几个方法最后试了都不行。
记录下查到的几个方法和最后实现的方法。
JS获取外网ip的方法：
代码语言：javascript复制//最简单的获取外网ip的方法。可以直接用，但是没啥用..
<script src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
<script>
document.write(returnCitySN["cip"]);
</script>JS获取内网Ip的方法：//有些浏览器获取到的加密ip段有问题，所以当其时期
代码语言：javascript复制function getIP(callback) {
let recode = {};
let RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
// 如果不存在则使用一个iframe绕过
if (!RTCPeerConnection) {
// 因为这里用到了iframe，所以在调用这个方法的script上必须有一个iframe标签
// <iframe id="iframe" sandbox="allow-same-origin" style="display:none;"></iframe>
let win = iframe.contentWindow;
RTCPeerConnection = win.RTCPeerConnection || win.mozRTCPeerConnection || win.webkitRTCPeerConnection;
}
//创建实例，生成连接
let pc = new RTCPeerConnection();
// 匹配字符串中符合ip地址的字段
function handleCandidate(candidate) {
debugger;
let ip_regexp = /([0-9]{1,3}(.[0-9]{1,3}){3}|([a-f0-9]{1,4}((:[a-f0-9]{1,4}){7}|: [a-f0-9]{1,4}){6}))/;
let ip_isMatch = candidate.match(ip_regexp)[1];
if (!recode[ip_isMatch]) {
callback(ip_isMatch);
recode[ip_isMatch] = true;
}
}
//监听icecandidate事件
pc.onicecandidate = (ice) => {
if (ice.candidate) {
handleCandidate(ice.candidate.candidate);
}
};
//建立一个伪数据的通道
pc.createDataChannel('');
pc.createOffer((res) => {
pc.setLocalDescription(res);
}, () => {});
//延迟，让一切都能完成
setTimeout(() => {
let lines = pc.localDescription.sdp.split('n');
lines.forEach(item => {
if (item.indexOf('a=candidate:') === 0) {
handleCandidate(item);
}
})
}, 1000);
}
getIP(function (ip) { alert(ip); });利用WebRTC获取真实内网Ip，WebRTC是一个支持网页浏览器进行实时语音对话或视频对话的API
由于WebRTC在建立连接过程中，会向对方发送本地地址SDP，因此可以通过访问SDP获得访问者的IP
但是有些浏览器用不了，所以还是放弃这种方式了。
最后还是觉得用Java来实现比较好吧，前端文章页写个ajax，每次进入文章先判断文章是否需要限制IP访问，如果需要就请求下后端，后端获取Ip判断是否在白名单内。注意ajax要用同步。
Java获取访问者Ip方法：
代码语言：javascript复制 String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
System.out.println(ip);完整代码
代码语言：javascript复制 /**
* 判断文章是否有权可看
*
* @param map
* @return
*/
@RequestMapping("/isIntranet.do")
@ResponseBody
public String isIntranet(ServletRequest request, ServletResponse response) {
Map<String, Object> map = new HashMap<String, Object>();
HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse resp = (HttpServletResponse)response;
// 判断访问者Ip是否白名单内
boolean flag = isIPOK(req, resp);
System.out.println(flag);
if (flag) {
return "true";
} else {
return "false";
}
}
private boolean isIPOK(HttpServletRequest request, HttpServletResponse response) {
// String accessIP = IPUtil.getUserIp(request);
String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
System.out.println(ip);
return isLAN(ip);
}
// 是否为内网网段
public boolean isLAN(String ip) {
if ("127.0.0.1".equals(ip)) {
return true;
}
boolean result = true;
try {
Properties prop = new Properties();
//获取设置Ip段的配置文件
InputStream in = this.getClass().getClassLoader().getResourceAsStream("ipConfig.properties");
prop.load(in);
// 遍历取值
Set<Object> objects = prop.keySet();
for (Object object : objects) {
String ipNot = new String(prop.getProperty((String)object).getBytes("iso-8859-1"), "gbk");
System.out.println(ipNot);
/*result = ipIsValid("192.168.8.78-192.168.255.255", ip) || ipIsValid("172.16.0.0-172.31.255.255", ip)
|| ipIsValid("10.0.0.0-10.255.255.255", ip);*/
result = ipIsValid(ipNot, ip);
}
in.close();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
//校验Ip是否包含在Ip段内
public static boolean ipIsValid(String ipSection, String ip) {
if (ipSection == null) {
throw new NullPointerException("IP段不能为空！");
}
if (ip == null) {
throw new NullPointerException("IP不能为空！");
}
ipSection = ipSection.trim();
ip = ip.trim();
final String REGX_IP =
"((25[0-5]|2[0-4]\d|1\d{2}|[1-9]\d|\d)\.){3}(25[0-5]|2[0-4]\d|1\d{2}|[1-9]\d|\d)";
final String REGX_IPB = REGX_IP "\-" REGX_IP;
if (!ipSection.matches(REGX_IPB) || !ip.matches(REGX_IP)) {
return false;
}
int idx = ipSection.indexOf('-');
idx = idx < 0 ? ipSection.length() : idx;
String[] sips = ipSection.substring(0, idx).split("\.");
String[] sipe = ipSection.substring(idx 1).split("\.");
String[] sipt = ip.split("\.");
long ips = 0L, ipe = 0L, ipt = 0L;
for (int i = 0; i < 4; i) {
ips = ips << 8 | Integer.parseInt(sips[i]);
ipe = ipe << 8 | Integer.parseInt(sipe[i]);
ipt = ipt << 8 | Integer.parseInt(sipt[i]);
}
if (ips > ipe) {
long t = ips;
ips = ipe;
ipe = t;
}
return ips <= ipt && ipt <= ipe;
}以上方法均来自网络，亲测有效，记录于此。
I am just a porter
