From 2198ad257a2c049f3601a6f95b8906c5be8b27d5 Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Thu, 31 Oct 2019 00:56:46 +0800
Subject: Continue to construct feature and tests.

---
 Timeline/Auth/MyAuthenticationHandler.cs | 99 ++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 Timeline/Auth/MyAuthenticationHandler.cs

(limited to 'Timeline/Auth/MyAuthenticationHandler.cs')

diff --git a/Timeline/Auth/MyAuthenticationHandler.cs b/Timeline/Auth/MyAuthenticationHandler.cs
new file mode 100644
index 00000000..f5dcd697
--- /dev/null
+++ b/Timeline/Auth/MyAuthenticationHandler.cs
@@ -0,0 +1,99 @@
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Microsoft.Net.Http.Headers;
+using System;
+using System.Linq;
+using System.Security.Claims;
+using System.Text.Encodings.Web;
+using System.Threading.Tasks;
+using Timeline.Models;
+using Timeline.Services;
+using static Timeline.Resources.Authentication.AuthHandler;
+
+namespace Timeline.Auth
+{
+    public static class AuthenticationConstants
+    {
+        public const string Scheme = "Bearer";
+        public const string DisplayName = "My Jwt Auth Scheme";
+    }
+
+    public class MyAuthenticationOptions : AuthenticationSchemeOptions
+    {
+        /// <summary>
+        /// The query param key to search for token. If null then query params are not searched for token. Default to <c>"token"</c>.
+        /// </summary>
+        public string TokenQueryParamKey { get; set; } = "token";
+    }
+
+    public class MyAuthenticationHandler : AuthenticationHandler<MyAuthenticationOptions>
+    {
+        private readonly ILogger<MyAuthenticationHandler> _logger;
+        private readonly IUserService _userService;
+
+        public MyAuthenticationHandler(IOptionsMonitor<MyAuthenticationOptions> options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock, IUserService userService)
+            : base(options, logger, encoder, clock)
+        {
+            _logger = logger.CreateLogger<MyAuthenticationHandler>();
+            _userService = userService;
+        }
+
+        // return null if no token is found
+        private string? ExtractToken()
+        {
+            // check the authorization header
+            string header = Request.Headers[HeaderNames.Authorization];
+            if (!string.IsNullOrEmpty(header) && header.StartsWith("Bearer ", StringComparison.InvariantCultureIgnoreCase))
+            {
+                var token = header.Substring("Bearer ".Length).Trim();
+                _logger.LogInformation(LogTokenFoundInHeader, token);
+                return token;
+            }
+
+            // check the query params
+            var paramQueryKey = Options.TokenQueryParamKey;
+            if (!string.IsNullOrEmpty(paramQueryKey))
+            {
+                string token = Request.Query[paramQueryKey];
+                if (!string.IsNullOrEmpty(token))
+                {
+                    _logger.LogInformation(LogTokenFoundInQuery, paramQueryKey, token);
+                    return token;
+                }
+            }
+
+            // not found anywhere then return null
+            return null;
+        }
+
+        protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
+        {
+            var token = ExtractToken();
+            if (string.IsNullOrEmpty(token))
+            {
+                _logger.LogInformation(LogTokenNotFound);
+                return AuthenticateResult.NoResult();
+            }
+
+            try
+            {
+                var userInfo = await _userService.VerifyToken(token);
+
+                var identity = new ClaimsIdentity(AuthenticationConstants.Scheme);
+                identity.AddClaim(new Claim(identity.NameClaimType, userInfo.Username, ClaimValueTypes.String));
+                identity.AddClaims(UserRoleConvert.ToArray(userInfo.Administrator).Select(role => new Claim(identity.RoleClaimType, role, ClaimValueTypes.String)));
+
+                var principal = new ClaimsPrincipal();
+                principal.AddIdentity(identity);
+
+                return AuthenticateResult.Success(new AuthenticationTicket(principal, AuthenticationConstants.Scheme));
+            }
+            catch (Exception e) when (!(e is ArgumentException))
+            {
+                _logger.LogInformation(e, LogTokenValidationFail);
+                return AuthenticateResult.Fail(e);
+            }
+        }
+    }
+}
-- 
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