fix(#I12XNX): 修复 OAuth 认证

#Issue
close #I12XNX

src/admin/Bootstrap.DataAccess/Bootstrap.DataAccess.csproj

@@ -1,9 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netcoreapp3.0;netstandard2.0</TargetFrameworks>
   </PropertyGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.0'">
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Bootstrap.Security.DataAccess" Version="2.2.21" />
     <PackageReference Include="Longbow" Version="3.0.0-beta1" />

src/admin/Bootstrap.DataAccess/Helper/OAuthHelper.cs

@@ -50,6 +50,27 @@ namespace Bootstrap.DataAccess
             };
         }
 
+#if NETCOREAPP3_0
+        private static T ToObject<T>(this System.Text.Json.JsonElement element) where T: OAuthUser
+        {
+            var user = new OAuthUser();
+            var target = element.EnumerateObject();
+            user.Id = target.TryGetValue("Id");
+            user.Login = target.TryGetValue("Login");
+            user.Name = target.TryGetValue("Name");
+            user.Avatar_Url = target.TryGetValue("Avatar_Url");
+            return user as T;
+        }
+
+        private static string TryGetValue(this System.Text.Json.JsonElement.ObjectEnumerator target, string propertyName)
+        {
+            var ret = string.Empty;
+            var property = target.FirstOrDefault(t => t.Name.Equals(propertyName, StringComparison.OrdinalIgnoreCase));
+            ret = property.Value.ToString();
+            return ret;
+        }
+#endif
+
         /// <summary>
         /// 插入 Gitee 授权用户到数据库中
         /// </summary>

src/admin/Bootstrap.DataAccess/Helper/WeChatHelper.cs

@@ -3,6 +3,7 @@ using Longbow.Security.Cryptography;
 using Longbow.WeChatAuth;
 using Microsoft.AspNetCore.Authentication.OAuth;
 using System;
+using System.Linq;
 
 namespace Bootstrap.DataAccess
 {
@@ -50,5 +51,32 @@ namespace Bootstrap.DataAccess
                 Description = $"{context.Scheme.Name}"
             };
         }
+
+#if NETCOREAPP3_0
+        private static T ToObject<T>(this System.Text.Json.JsonElement element) where T : WeChatUser
+        {
+            var user = new WeChatUser();
+            var target = element.EnumerateObject();
+            user.OpenId = target.TryGetValue("OpenId");
+            user.UnionId = target.TryGetValue("UnionId");
+            user.NickName = target.TryGetValue("NickName");
+            user.Privilege = target.TryGetValue("Privilege");
+            user.Sex = target.TryGetValue("Sex");
+            user.Province = target.TryGetValue("Province");
+            user.City = target.TryGetValue("City");
+            user.Country = target.TryGetValue("Country");
+            user.HeadImgUrl = target.TryGetValue("HeadImgUrl");
+            user.Privilege = target.TryGetValue("Privilege");
+            return user as T;
+        }
+
+        private static string TryGetValue(this System.Text.Json.JsonElement.ObjectEnumerator target, string propertyName)
+        {
+            var ret = string.Empty;
+            var property = target.FirstOrDefault(t => t.Name.Equals(propertyName, StringComparison.OrdinalIgnoreCase));
+            ret = property.Value.ToString();
+            return ret;
+        }
+#endif
     }
 }