anglarjs1.6.3+owin 实现验证之一：统一拒绝非登录访问。

1、anglarjs端在app.js(即anglar的入口js)，注册.factory("messageService"，使得每次来自html客户端的请求都能带有一个值，如AKey：

var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];function generateMixed(n) {     var res = "";     for(var i = 0; i < n ; i ++) {         var id = Math.ceil(Math.random()*35);         res += chars[id];     }     return res;}var ClientID=generateMixed(6);

var Akey='ccc';
expressApp.factory('authInterceptor', function($rootScope){
    return {
        request: function(config){
            config.headers = config.headers || {};
            config.headers.authorization = Akey;
            return config;
        },
        responseError: function(response){
            )
            {
                debugger
                location.href="./E403.html"
            }
        }
    };
})
expressApp.config(function ($locationProvider, $routeProvider,$httpProvider) {
    $httpProvider.interceptors.push('authInterceptor');
}

2、html客户端做一个403页面，页面带一个连接，连接跳转到登录页

<li>
     使用具有访问权限的账户重新登录系统，点击：
    <a href="./index.html#/login">此处</a>。
 </li>

3、客户端包含一个登录页login.html，对应的关键js如下：

$http({
    method: 'post', url: baseUrl+'account/login',
    data: {
        LoginName: $scope.LoginName,
        Password:$scope.Password,
        ClientID:ClientID
    }
}).then(function (response) {
        Akey=response.data.LogonUser.SessionKey;
    },
    function (response) {
    }
);

这里面最重要的一句话，就是Akey=response.data.LogonUser.SessionKey; 因为Aky是在app.js里面定义的全局变量，所以登录之前是一个错误值，在服务端限定以后，不能访问任何常规的action，但是只能访问服务端的account/login这个action。

4、下来看看服务端的login这个action

[Route("express/account/login")]
public HttpResponseMessage Login(Users user)
{
    if (string.IsNullOrEmpty(user.LoginName))
        return Request.CreateResponse(HttpStatusCode.Forbidden);
    if (string.IsNullOrEmpty(user.Password))
        return Request.CreateResponse(HttpStatusCode.Forbidden);

    var nowUser = auS.GetUserByUserId(user.LoginName);
    if (nowUser == null)
        return Request.CreateResponse(HttpStatusCode.Forbidden);

    #region 验证密码
    if (!string.Equals(nowUser.Password, user.Password))
    {
        return Request.CreateResponse(HttpStatusCode.Forbidden);
    }
    #endregion

    if (nowUser.IsDelete)
        return Request.CreateResponse(HttpStatusCode.Forbidden);

    var existsDevice = auS.GetClientUser(nowUser.LoginName);

    if (existsDevice == null)
    {
        string passkey = auS.ComputeHash(nowUser.LoginName + nowUser.ClientID + DateTime.UtcNow + Guid.NewGuid());
        existsDevice = new Users()
        {
            LoginName = nowUser.LoginName,
            SessionKey = passkey,
            ClientID = user.ClientID
        };
        auS.AddClientUser(existsDevice);
    }
    else
    {

        auS.UpdateUserDevice(existsDevice);
    }
    existsDevice.Password = "";

    return Request.CreateResponse(HttpStatusCode.OK, new SessionObject() { SessionKey = existsDevice.SessionKey, LogonUser = existsDevice });
}

这里面最关键的一个就是这两句话，当客户端发来一个clientID以后，使用一定的规则合成一个会话ID，存到内存中一个静态列表里面，以实现只要登录一次且不超时，就缓存这个人的登录信息，相当于session一样的效果。

string passkey = auS.ComputeHash(nowUser.LoginName + nowUser.ClientID + DateTime.UtcNow + Guid.NewGuid());
ClientID = user.ClientID

那么在来看看app.js里面的这个ClientID：

','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];

function generateMixed(n) {
     var res = "";
     ; i < n ; i ++) {
         );
         res += chars[id];
     }
     return res;
}
);

5、来看看AuthenticationService.cs的一些关键代码：这里也可以用字典，甚至可以把列表迁移到redis上面去都可以。

public string ComputeHash(string input)
{
    byte[] data = Md5.ComputeHash(Encoding.Unicode.GetBytes(input));
    var sBuilder = new StringBuilder();
    foreach (byte t in data)
        sBuilder.Append(t.ToString("X"));
    return sBuilder.ToString();
}
 /// <summary>
/// 使用唯一标识获得登录用户
/// </summary>
/// <param name="Akey"></param>
/// <returns></returns>
public Users GetClientUserByAkey(string Akey)
{
    //headers.Authorization.Scheme
    var ul = ClientUser.Where(_ =>
    {
        return _.SessionKey == Akey;
    });
    )
    {
        var u = ul.FirstOrDefault();
        if (u.ExpiredTime < DateTime.Now)
        {
            return u;
        }
        else
        {
            ClientUser.Remove(u);
        }
    }
    return null;
}

public Users GetUserByUserId(string loginName)
{

　　//Accessor是我写的一个ORM的访问器
　　var ul = Accessor.GetList<Users>(new { LoginName = loginName });
　　return ul.FirstOrDefault();
}

首先BaseController继承自ApiController，而且用于登录的那个Controller也就是AccountController必须继承自 ApiController

AccountController : ApiController

BaseController: ApiController

再来看看BaseController的关键代码，这样我们写业务Controller（非登录AccountController）的时候，比如ProductController,让ProductController:BaseController即可

public Express.Entity.Users currentUser = null;
public override Task<HttpResponseMessage> ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken)
{
    if (controllerContext.Request.Headers.Authorization != null
        && !string.IsNullOrWhiteSpace(controllerContext.Request.Headers.Authorization.Scheme))
    {
        currentUser = new AuthenticationService().GetClientUserByAkey(controllerContext.Request.Headers.Authorization.Scheme);
        if (currentUser == null)
        {
            var response = new HttpResponseMessage(HttpStatusCode.Forbidden);
            var tsc = new TaskCompletionSource<HttpResponseMessage>();
            tsc.SetResult(response);
            return tsc.Task;
        }
    }
    else
    {
        var response = new HttpResponseMessage(HttpStatusCode.Forbidden);
        var tsc = new TaskCompletionSource<HttpResponseMessage>();
        tsc.SetResult(response);
        return tsc.Task;
    }
    return base.ExecuteAsync(controllerContext, cancellationToken);
}

好了，下一篇讲述，如果实现粒度到action级别的权限控制。