增加post 流方式。 增加生成下载链接。

Author: cuiliang

src/Entites/OssRegions.cs

@@ -17,6 +17,14 @@ public class OssRegions
         // 华北 2
         public const string BeiJing = "oss-cn-beijing";
 
+        // 华北3 张家口
+        public const string ZhangJiaKou = "oss-cn-zhangjiakou";
+        
+        // 华北5 呼和浩特
+        public const string HuHeHaoTe = "oss-cn-huhehaote";
+
+
+
         // 华南 1
         public const string ShenZhen = "oss-cn-shenzhen";
 

src/OssClient.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Net;
 using System.Threading.Tasks;
 using Cuiliang.AliyunOssSdk.Api;
 using Cuiliang.AliyunOssSdk.Api.Bucket.List;
@@ -16,6 +17,7 @@
 using Cuiliang.AliyunOssSdk.Entites;
 using Cuiliang.AliyunOssSdk.Request;
 using Cuiliang.AliyunOssSdk.Utility;
+using Cuiliang.AliyunOssSdk.Utility.Authentication;
 
 namespace Cuiliang.AliyunOssSdk
 {
@@ -104,6 +106,28 @@ public async Task<OssResult<PutObjectResult>> PutObjectByFileNameAsync(BucketInf
             }
         }
 
+        /// <summary>
+        /// 上传流
+        /// </summary>
+        /// <param name="bucket"></param>
+        /// <param name="key"></param>
+        /// <param name="content">内容流</param>
+        /// <param name="mimeType"></param>
+        /// <returns></returns>
+        public async Task<OssResult<PutObjectResult>> PutObjectAsync(BucketInfo bucket, string key, Stream content,
+            string mimeType = "application/octet-stream")
+        {
+            var file = new RequestContent()
+            {
+                ContentType = RequestContentType.String,
+                StreamContent = content,
+                MimeType = mimeType
+            };
+
+            return await PutObjectAsync(bucket, key, file);
+        }
+
+
         /// <summary>
         /// 复制对象
         /// </summary>
@@ -205,5 +229,44 @@ public async Task<OssResult<GetObjectMetaResult>> GetObjectMetaAsync(BucketInfo
             var cmd = new GetObjectMetaCommand(_requestContext, bucket, key);
             return await cmd.ExecuteAsync();
         }
+
+        /// <summary>
+        /// 获取文件的下载链接
+        /// </summary>
+        /// <param name="storeKey"></param>
+        /// <param name="expireSeconds"></param>
+        /// <returns></returns>
+        public string GetFileDownloadLink(BucketInfo bucket, string storeKey, int expireSeconds)
+        {
+            long seconds = (DateTime.UtcNow.Ticks - 621355968000000000) / 10000000;
+
+            string toSign = String.Format("GET\n\n\n{0}\n/{1}/{2}", seconds, bucket, storeKey);
+
+            string sign = ServiceSignature.Create().ComputeSignature(
+                _requestContext.OssCredential.AccessKeyId, toSign);
+
+            string url = String.Format("{0}{1}/{2}?OSSAccessKeyId={3}&Expires={4}&Signature={5}",
+                bucket.EndpointUri,
+                bucket,
+                storeKey,
+                _requestContext.OssCredential.AccessKeyId,
+                seconds,
+                WebUtility.UrlEncode(sign));
+
+            return url;
+        }
+
+        /// <summary>
+        /// 生成直接post到oss的签名
+        /// </summary>
+        /// <param name="policy"></param>
+        /// <returns></returns>
+        public string ComputePostSignature(string policy)
+        {
+            string sign = ServiceSignature.Create().ComputeSignature(
+                _requestContext.OssCredential.AccessKeyId, policy);
+
+            return sign;
+        }
     }
 }

src/Utility/Authentication/HmacSHA1Signature.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Cuiliang.AliyunOssSdk.Utility.Authentication
+{
+    public class HmacSHA1Signature: ServiceSignature
+    {
+        private readonly Encoding _encoding = Encoding.UTF8;
+
+        public override string SignatureMethod
+        {
+            get { return "HmacSHA1"; }
+        }
+
+        public override string SignatureVersion
+        {
+            get { return "1"; }
+        }
+
+        protected override string ComputeSignatureCore(string key, string data)
+        {
+            Debug.Assert(!string.IsNullOrEmpty(data));
+
+            using (var algorithm = KeyedHashAlgorithm.Create(
+                SignatureMethod.ToString().ToUpperInvariant()))
+            {
+                algorithm.Key = _encoding.GetBytes(key.ToCharArray());
+                return Convert.ToBase64String(
+                    algorithm.ComputeHash(_encoding.GetBytes(data.ToCharArray())));
+            }
+        }
+    }
+}

src/Utility/Authentication/ServiceSignature.cs

@@ -0,0 +1,33 @@
+using System;
+
+namespace Cuiliang.AliyunOssSdk.Utility.Authentication
+{
+    public abstract class ServiceSignature
+    {
+
+        public abstract string SignatureMethod { get; }
+
+        public abstract string SignatureVersion { get; }
+
+        public string ComputeSignature(String key, String data)
+        {
+            if (string.IsNullOrEmpty(key))
+                throw new ArgumentException(
+                    "参数为空", "key");
+            if (string.IsNullOrEmpty(data))
+                throw new ArgumentException(
+                    "参数为空", "data");
+
+
+            return ComputeSignatureCore(key, data);
+        }
+
+        protected abstract string ComputeSignatureCore(string key, string data);
+
+        public static ServiceSignature Create()
+        {
+            return new HmacSHA1Signature();
+        }
+
+    }
+}