From 45c09ace4acee4df9c860395fb7261adb09bc914 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Mon, 22 Apr 2019 17:03:07 +0800
Subject: Add Tencent COS.

---
 Timeline/Configs/TencentCosConfig.cs        | 13 ++++
 Timeline/Services/TencentCloudCosService.cs | 94 +++++++++++++++++++++++++++++
 Timeline/Startup.cs                         |  3 +
 Timeline/Timeline.csproj                    |  1 +
 4 files changed, 111 insertions(+)
 create mode 100644 Timeline/Configs/TencentCosConfig.cs
 create mode 100644 Timeline/Services/TencentCloudCosService.cs

diff --git a/Timeline/Configs/TencentCosConfig.cs b/Timeline/Configs/TencentCosConfig.cs
new file mode 100644
index 00000000..c41669f1
--- /dev/null
+++ b/Timeline/Configs/TencentCosConfig.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+namespace Timeline.Configs
+{
+    public class TencentCosConfig
+    {
+        public string AppId { get; set; }
+        public string Region { get; set; }
+        public string SecretId { get; set; }
+        public string SecretKey { get; set; }
+    }
+}
diff --git a/Timeline/Services/TencentCloudCosService.cs b/Timeline/Services/TencentCloudCosService.cs
new file mode 100644
index 00000000..f1f52ec5
--- /dev/null
+++ b/Timeline/Services/TencentCloudCosService.cs
@@ -0,0 +1,94 @@
+using COSXML;
+using COSXML.Auth;
+using COSXML.CosException;
+using COSXML.Model;
+using COSXML.Model.Object;
+using COSXML.Model.Tag;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using System;
+using System.Threading.Tasks;
+using Timeline.Configs;
+
+namespace Timeline.Services
+{
+    public interface ITencentCloudCosService
+    {
+        Task<bool> Exists(string bucket, string key);
+        string GetObjectUrl(string bucket, string key);
+    }
+
+    public class TencentCloudCosService : ITencentCloudCosService
+    {
+        private readonly TencentCosConfig _config;
+        private readonly CosXmlServer _server;
+        private readonly ILogger<TencentCloudCosService> _logger;
+
+        public TencentCloudCosService(IOptions<TencentCosConfig> config, ILogger<TencentCloudCosService> logger)
+        {
+            _config = config.Value;
+            _logger = logger;
+
+            var cosConfig = new CosXmlConfig.Builder()
+                .IsHttps(true)
+                .SetAppid(config.Value.AppId)
+                .SetRegion(config.Value.Region)
+                .SetDebugLog(true)
+                .Build();
+
+            var credentialProvider = new DefaultQCloudCredentialProvider(config.Value.SecretId, config.Value.SecretKey, 3600);
+
+            _server = new CosXmlServer(cosConfig, credentialProvider);
+        }
+
+        public Task<bool> Exists(string bucket, string key)
+        {
+            bucket = bucket + "-" + _config.AppId;
+
+            var request = new HeadObjectRequest(bucket, key);
+
+            var t = new TaskCompletionSource<bool>();
+
+            _server.HeadObject(request, delegate (CosResult result)
+            {
+                if (result.httpCode >= 200 && result.httpCode < 300)
+                    t.SetResult(true);
+                else
+                    t.SetResult(false);
+            },
+            delegate (CosClientException clientException, CosServerException serverException)
+            {
+                if (clientException != null)
+                {
+                    _logger.LogError(clientException, "An client error occured when test cos object existence. Bucket : {} . Key : {} .", bucket, key);
+                    t.SetException(clientException);
+                    return;
+                }
+                if (serverException != null)
+                {
+                    _logger.LogError(serverException, "An server error occured when test cos object existence. Bucket : {} . Key : {} .", bucket, key);
+                    t.SetException(serverException);
+                    return;
+                }
+                _logger.LogError("An unknown error occured when test cos object existence. Bucket : {} . Key : {} .", bucket, key);
+                t.SetException(new Exception("Unknown exception when test cos object existence."));
+            });
+
+            return t.Task;
+        }
+
+        public string GetObjectUrl(string bucket, string key)
+        {
+            return _server.GenerateSignURL(new PreSignatureStruct()
+            {
+                appid = _config.AppId,
+                region = _config.Region,
+                bucket = bucket + "-" + _config.AppId,
+                key = key,
+                httpMethod = "GET",
+                isHttps = true,
+                signDurationSecond = 300
+            });
+        }
+    }
+}
diff --git a/Timeline/Startup.cs b/Timeline/Startup.cs
index 285dfcfa..6491554a 100644
--- a/Timeline/Startup.cs
+++ b/Timeline/Startup.cs
@@ -80,6 +80,9 @@ namespace Timeline
                         warnings.Throw(RelationalEventId.QueryClientEvaluationWarning);
                 });
             });
+
+            services.Configure<TencentCosConfig>(Configuration.GetSection(nameof(TencentCosConfig)));
+            services.AddSingleton<ITencentCloudCosService, TencentCloudCosService>();
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
diff --git a/Timeline/Timeline.csproj b/Timeline/Timeline.csproj
index 93513bd3..c9454ec9 100644
--- a/Timeline/Timeline.csproj
+++ b/Timeline/Timeline.csproj
@@ -12,5 +12,6 @@
         <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.2.3" />
         <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="2.2.0" />
         <PackageReference Include="Pomelo.EntityFrameworkCore.MySql.Design" Version="1.1.2" />
+        <PackageReference Include="Tencent.QCloud.Cos.Sdk.NetCore" Version="5.4.1.1" />
     </ItemGroup>
 </Project>
-- 
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