# EvtDoor
一、项目概述
在传统的门禁系统中,对于出入人员的管理,主是是通过刷卡、指纹、虹膜、或是人工授权等工作。在传统的门禁管理系统中,对于内部员工管理十分方便,而且功能完善,尤其是近几年的互联网快速发展,越来越多的中小企业开始安装自己的门禁系统,实现对企内工作人员的出入自动化管理。针对上述传统门禁的不足之处和对区块链技术的掌握和探索,我们拟采用区块链中通证验证的思想设计门禁系统,利用区块链中生成并发行的通证二维码来描述身份信息,通过区块链技术对二维码解析,通过调用共链上的相关信息来验证通证的有效性。这样能够对中心身份验证机制进行改进,实现去中心安全服务。
二、项目特色
1. 采用二维码通证的方式来验证门禁系统,用户能够通过移动终端软件来生成,相对于传统门禁系统更加方便。
2. 系统的设计是基于区块链的相关技术做的二次开发,系统相对于市面上的其他同类型软件来说,比较安全。
3. 通过对通证的权限进行相关设置,能够实现对已经发行通证的销毁,管理方便。
4. 通过通证生成的二维码具有实时更新的动态效果,每个二维码验证具有时效性,相对于传统的验证方式更加安全。
三、作品安装说明
1. 硬件方面:树莓派3B+、UPS不间断电源、电磁锁、电磁继电器、摄像头。
通过树莓派部署门禁系统运行需要的环境,将摄像头连接在树莓派上,能够通过树莓派调用摄像头扫描服务,然后树莓派能够通过扫描的结果来控制电磁锁,其中为防止断电,我们采用UPS不间断电源为整个系统供电。
2. 软件方面:基于Everitoken开发的钱包、基于Everitoken开发的门禁控制系统。
用户可以直接在自己的移动终端上下载基于Everitoken二次开发的EVT钱包,通过钱包里验证通证的功能使用们系统系统的服务,在树莓派上部署基于Everitoken二次开发的门禁系统,能够实现通过验证结果来控制电磁锁的功能。
四、设计思路
1. 用户使用移动设备中基于Everitoken二次开发的钱包软件,生成通证,并发布在区块链的公链上。
2. 通过门禁系统对来访的用户手中的二维码,通过调用公链上已经存在的通证进行验证,并将验证的结果反馈给门禁系统,由门禁系统确定是否打开电磁锁。
采用区块链中非对称加密的方法生成通证,根据通证的内容生成二维码,并且通过二维码我们不能够解析出任何与用户个人信息有关的内容,能够保证系统的安全性。树莓派上部署的门禁系统通过对用户持有的通证进行验证,验证的方法试通过调用共链上的信息执行的,基于区块链的安全性,通证具有不可伪造的安全特性。
五、代码实现(部分)
树莓派调用摄像头服务:
private static String qrcode = "/home/pi/image/image.jpg";
private static String[] cmdOrder = {"sh", "-c", "raspistill -w 500 -h 500 -o " + qrcode};
public static boolean photo() {
try {
Process process = Runtime.getRuntime().exec(cmdOrder);
process.waitFor();
InputStream inputStream = process.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String str = null;
while((line = bufferedReader.readLine()) != null) {
System.out.println("系统信息: (Take photo) " + str);
}
} catch (InterruptedException exception) {
return false;
} catch (IOException exception) {
return false;
}
return true;
}
通过树莓派控制继电器:
public static void OpenDoor(GpioPinDigitalOutput gd) {
gd.setState(PinState.LOW); //设置低电平断电
try {
Thread.sleep(3000); //停留3秒
} catch (InterruptedException exception) {
exception.printStackTrace();
} finally {
gd.setState(PinState.HIGH);
}
}
解码实现:
public static String decodeImg(File file) throws Exception {
try {
MultiFormatReader formatReader = new MultiFormatReader();
if (!file.exists()) {
System.out.println("你要解析的内容不存在!");
return null;
}
//file->内存中的一张图片
BufferedImage image = ImageIO.read(file);
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
QRCodeReader reader = new QRCodeReader();
Result result = null;
try {
result = reader.decode(bitmap);
return result.getText();
} catch (ReaderException e) {
e.printStackTrace();
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
使用Everitoken服务对字符串内容进行解析:
NetParams netParams = new MainNetNetParams(NetParams.NET.MAINNET1);
String linkID = ExplainQrCodes();
if(linkID!=null){
EvtLink.EveriPassVerificationResult epvr = new
EvtLink.EveriPassVerificationResult(true, "ZJ123456", "door10");
epvr = EvtLink.validateEveriPassUnsafe(netParams,linkID);
if(epvr.isValid()) {
System.out.println(epvr.isValid()+epvr.getDomain()+epvr.getTokenName());
if(epvr.getDomain().equalsIgnoreCase("ZJ123456")){
System.out.println("通证"+epvr.getTokenName()+"打开门禁");
OpenDoor(doorController);
continue;
}
}
}
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