1 files changed, 94 insertions, 0 deletions
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
+            });
+        }
+    }
+}