feat: Optimize BlobProvider

- 阿里云OSS SDK v4签名存在缺陷, 默认使用v1签名
- 阿里云OSS SDK v2不支持CORS配置, 默认不开启预览, 使用后台代理链接预览文件
- 阿里云BlobProvider增加多个适配SDK v2的配置项
- 腾讯云OSS默认不支持文件预览功能, 需要额外开通数据处理服务, 默认不开启预览, 使用后台代理链接预览文件

aspnet-core/framework/cloud-aliyun/LINGYUN.Abp.Aliyun/LINGYUN/Abp/Aliyun/AliyunClientFactory.cs

@@ -98,20 +98,19 @@ public abstract class AliyunClientFactory<TClient>
                 assumeRoleResponse.Body.Credentials.AccessKeySecret,
                 assumeRoleResponse.Body.Credentials.SecurityToken);
 
-            var expirationTimeSpan = TimeSpan.FromSeconds(durationSeconds - 10);
+            var cacheOptions = new DistributedCacheEntryOptions
+            {
+                AbsoluteExpirationRelativeToNow = TimeSpan.FromSeconds(durationSeconds - 10),
+            };
             if (DateTime.TryParse(assumeRoleResponse.Body.Credentials.Expiration, out var expiration))
             {
                 cacheItem.Expiration = expiration;
-                expirationTimeSpan = new TimeSpan(expiration.AddSeconds(-10).Ticks);
             }
 
             await Cache.SetAsync(
                 cacheKey,
                 cacheItem,
-                new DistributedCacheEntryOptions
+                cacheOptions);
-                {
-                    AbsoluteExpirationRelativeToNow = expirationTimeSpan,
-                });
         }
 
         return cacheItem;

aspnet-core/framework/common/LINGYUN.Abp.BlobStoring.Aliyun/LINGYUN/Abp/BlobStoring/Aliyun/AliyunBlobNamingNormalizer.cs

@@ -1,4 +1,5 @@
-using System.Text.RegularExpressions;
+using System;
+using System.Text.RegularExpressions;
 using Volo.Abp.BlobStoring;
 using Volo.Abp.DependencyInjection;
 
@@ -14,7 +15,10 @@ public class AliyunBlobNamingNormalizer : IBlobNamingNormalizer, ITransientDepen
     /// <returns></returns>
     public virtual string NormalizeBlobName(string blobName)
     {
-        return blobName;
+        // 不能以正斜线（/）或者反斜线（\）开头。
+        return blobName
+            .RemovePreFix("/")
+            .RemovePreFix("\\");
     }
 
     /// <summary>

aspnet-core/framework/common/LINGYUN.Abp.BlobStoring.Aliyun/LINGYUN/Abp/BlobStoring/Aliyun/AliyunBlobProvider.cs

@@ -35,7 +35,7 @@ public class AliyunBlobProvider : BlobProviderBase, ITransientDependency
 
     public override async Task<bool> DeleteAsync(BlobProviderDeleteArgs args)
     {
-        var ossClient = await GetOssClientAsync(args);
+        using var ossClient = await GetOssClientAsync(args);
         var blobName = AliyunBlobNameCalculator.Calculate(args);
 
         if (await BlobExistsAsync(ossClient, args, blobName))
@@ -55,7 +55,7 @@ public class AliyunBlobProvider : BlobProviderBase, ITransientDependency
 
     public override async Task<bool> ExistsAsync(BlobProviderExistsArgs args)
     {
-        var ossClient = await GetOssClientAsync(args);
+        using var ossClient = await GetOssClientAsync(args);
         var blobName = AliyunBlobNameCalculator.Calculate(args);
 
         return await BlobExistsAsync(ossClient, args, blobName);
@@ -63,40 +63,39 @@ public class AliyunBlobProvider : BlobProviderBase, ITransientDependency
 
     public override async Task<Stream> GetOrNullAsync(BlobProviderGetArgs args)
     {
-        var ossClient = await GetOssClientAsync(args);
+        using var ossClient = await GetOssClientAsync(args);
         var blobName = AliyunBlobNameCalculator.Calculate(args);
 
-        if (!await BlobExistsAsync(ossClient, args, blobName))
+        //if (!await BlobExistsAsync(ossClient, args, blobName))
-        {
+        //{
-            return null;
+        //    return null;
-        }
+        //}
-
-        var result = await ossClient.GetObjectAsync(
-            new GetObjectRequest
-            {
-                Bucket = GetBucketName(args),
-                Key = blobName,
-            });
-        return result.Body;
 
-        // TODO: 阿里云sdk预签名不可用[2026/05/23]
+        //var result = await ossClient.GetObjectAsync(
-        //var configuration = args.Configuration.GetAliyunConfiguration();
-        //var presignResult = ossClient.Presign(
         //    new GetObjectRequest
         //    {
         //        Bucket = GetBucketName(args),
         //        Key = blobName,
-        //    }, 
+        //    });
-        //    Clock.Now.AddSeconds(configuration.PresignedGetExpirySeconds));
+        //return result.Body;
+
+        var configuration = args.Configuration.GetAliyunConfiguration();
+        var presignResult = ossClient.Presign(
+            new GetObjectRequest
+            {
+                Bucket = GetBucketName(args),
+                Key = blobName,
+            },
+            Clock.Now.AddSeconds(configuration.PresignedGetExpirySeconds));
 
-        //var httpClient = HttpClientFactory.CreateAliyunHttpClient();
+        var httpClient = HttpClientFactory.CreateAliyunHttpClient();
 
-        //return await httpClient.GetStreamAsync(presignResult.Url, args.CancellationToken);
+        return await httpClient.GetStreamAsync(presignResult.Url, args.CancellationToken);
     }
 
     public override async Task SaveAsync(BlobProviderSaveArgs args)
     {
-        var ossClient = await GetOssClientAsync(args);
+        using var ossClient = await GetOssClientAsync(args);
         var blobName = AliyunBlobNameCalculator.Calculate(args);
         var configuration = args.Configuration.GetAliyunConfiguration();
 

aspnet-core/framework/common/LINGYUN.Abp.BlobStoring.Aliyun/LINGYUN/Abp/BlobStoring/Aliyun/AliyunBlobProviderConfiguration.cs

@@ -6,6 +6,22 @@ namespace LINGYUN.Abp.BlobStoring.Aliyun;
 
 public class AliyunBlobProviderConfiguration
 {
+    /// <summary>
+    /// 默认签名版本
+    /// </summary>
+    public const string DefaultSignatureVersion = "v1"; //TODO: 阿里云 OSS SDKv2 SignerV4.ResourcePath存在缺陷, 临时使用v1签名
+    /// <summary>
+    /// 默认跳过服务器证书验证
+    /// </summary>
+    public const bool DefaultInsecureSkipVerify = false;
+    /// <summary>
+    /// 默认命名空间不存在是否创建
+    /// </summary>
+    public const bool DefaultCreateBucketIfNotExists = false;
+    /// <summary>
+    /// 默认预签名链接过期时间
+    /// </summary>
+    public const int DefaultPresignedGetExpirySeconds = 600;
     /// <summary>
     /// 命名空间
     /// </summary>
@@ -15,10 +31,18 @@ public class AliyunBlobProviderConfiguration
         set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.BucketName, value);
     }
     /// <summary>
+    /// 签名版本（可选项：v1、v4）
+    /// 默认: v1
+    /// </summary>
+    public string SignatureVersion {
+        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.SignatureVersion, DefaultSignatureVersion);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.SignatureVersion, value);
+    }
+    /// <summary>
     /// 跳过服务器证书验证
     /// </summary>
     public bool InsecureSkipVerify {
-        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.InsecureSkipVerify, false);
+        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.InsecureSkipVerify, DefaultInsecureSkipVerify);
         set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.InsecureSkipVerify, value);
     }
     /// <summary>
@@ -26,7 +50,7 @@ public class AliyunBlobProviderConfiguration
     /// </summary>
     public bool CreateBucketIfNotExists
     {
-        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.CreateBucketIfNotExists, false);
+        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.CreateBucketIfNotExists, DefaultCreateBucketIfNotExists);
         set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.CreateBucketIfNotExists, value);
     }
     /// <summary>
@@ -55,15 +79,44 @@ public class AliyunBlobProviderConfiguration
         }
     }
 
-    /// <summary>
+
-    /// Default value: 7 * 24 * 3600.
-    /// </summary>
     public int PresignedGetExpirySeconds {
-        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.PresignedGetExpirySeconds, _defaultExpirySeconds);
+        get => _containerConfiguration.GetConfigurationOrDefault(AliyunBlobProviderConfigurationNames.PresignedGetExpirySeconds, DefaultPresignedGetExpirySeconds);
         set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.PresignedGetExpirySeconds, value);
     }
 
-    private int _defaultExpirySeconds = 7 * 24 * 3600;
+    public string Endpoint {
+        get => _containerConfiguration.GetConfigurationOrDefault<string>(AliyunBlobProviderConfigurationNames.Endpoint, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.Endpoint, value);
+    }
+    public bool? UsePathStyle {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.UsePathStyle, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.UsePathStyle, value);
+    }
+    public bool? UseCName {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.UseCName, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.UseCName, value);
+    }
+    public bool? UseDualStackEndpoint {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.UseDualStackEndpoint, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.UseDualStackEndpoint, value);
+    }
+    public bool? UseAccelerateEndpoint {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.UseAccelerateEndpoint, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.UseAccelerateEndpoint, value);
+    }
+    public bool? UseInternalEndpoint {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.UseInternalEndpoint, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.UseInternalEndpoint, value);
+    }
+    public bool? DisableUploadCrc64Check {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.DisableUploadCrc64Check, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.DisableUploadCrc64Check, value);
+    }
+    public bool? DisableDownloadCrc64Check {
+        get => _containerConfiguration.GetConfigurationOrDefault<bool?>(AliyunBlobProviderConfigurationNames.DisableDownloadCrc64Check, null);
+        set => _containerConfiguration.SetConfiguration(AliyunBlobProviderConfigurationNames.DisableDownloadCrc64Check, value);
+    }
 
     private readonly BlobContainerConfiguration _containerConfiguration;
 

aspnet-core/framework/common/LINGYUN.Abp.BlobStoring.Aliyun/LINGYUN/Abp/BlobStoring/Aliyun/AliyunBlobProviderConfigurationNames.cs

@@ -11,6 +11,10 @@ public static class AliyunBlobProviderConfigurationNames
     /// </summary>
     public const string BucketName = "Aliyun:OSS:BucketName";
     /// <summary>
+    /// 签名版本（可选项：v1、v4）
+    /// </summary>
+    public const string SignatureVersion = "Aliyun:OSS:SignatureVersion";
+    /// <summary>
     /// 跳过服务器证书验证
     /// </summary>
     public const string InsecureSkipVerify = "Aliyun:OSS:InsecureSkipVerify";
@@ -30,4 +34,12 @@ public static class AliyunBlobProviderConfigurationNames
     /// 生成预签名Uri的过期时间(s)
     /// </summary>
     public const string PresignedGetExpirySeconds = "Aliyun:OSS:PresignedGetExpirySeconds";
+
+    public const string UsePathStyle = "Aliyun:OSS:UsePathStyle";
+    public const string UseCName = "Aliyun:OSS:UseCName";
+    public const string UseDualStackEndpoint = "Aliyun:OSS:UseDualStackEndpoint";
+    public const string UseAccelerateEndpoint = "Aliyun:OSS:UseAccelerateEndpoint";
+    public const string UseInternalEndpoint = "Aliyun:OSS:UseInternalEndpoint";
+    public const string DisableUploadCrc64Check = "Aliyun:OSS:DisableUploadCrc64Check";
+    public const string DisableDownloadCrc64Check = "Aliyun:OSS:DisableDownloadCrc64Check";
 }

aspnet-core/framework/common/LINGYUN.Abp.BlobStoring.Aliyun/LINGYUN/Abp/BlobStoring/Aliyun/OssClientFactory.cs

@@ -1,5 +1,6 @@
 using AlibabaCloud.OSS.V2;
 using AlibabaCloud.OSS.V2.Credentials;
+using AlibabaCloud.OSS.V2.Transport;
 using LINGYUN.Abp.Aliyun;
 using System;
 using Volo.Abp.Caching;
@@ -31,10 +32,10 @@ public class OssClientFactory : AliyunClientFactory<Client, AliyunBlobProviderCo
             new Configuration
             {
                 Region = regionId,
-                CredentialsProvider = new CredentialsProviderFunc(() =>
+                SignatureVersion = AliyunBlobProviderConfiguration.DefaultSignatureVersion,
-                {
+                InsecureSkipVerify = AliyunBlobProviderConfiguration.DefaultInsecureSkipVerify,
-                    return new Credentials(accessKeyId, accessKeySecret);
+                CredentialsProvider = new StaticCredentialsProvider(accessKeyId, accessKeySecret),
-                }),
+                HttpTransport = HttpTransport.Shared,
             });
         //return new OssClient(
         //    regionId,
@@ -56,11 +57,18 @@ public class OssClientFactory : AliyunClientFactory<Client, AliyunBlobProviderCo
             new Configuration
             {
                 Region = regionId,
-                CredentialsProvider = new CredentialsProviderFunc(() =>
+                Endpoint = configuration.Endpoint,
-                {
+                SignatureVersion = configuration.SignatureVersion,
-                    return new Credentials(accessKeyId, accessKeySecret);
-                }),
                 InsecureSkipVerify = configuration.InsecureSkipVerify,
+                UseCName = configuration.UseCName,
+                UsePathStyle = configuration.UsePathStyle,
+                UseAccelerateEndpoint = configuration.UseAccelerateEndpoint,
+                UseDualStackEndpoint = configuration.UseDualStackEndpoint,
+                UseInternalEndpoint = configuration.UseInternalEndpoint,
+                DisableUploadCrc64Check = configuration.DisableUploadCrc64Check,
+                DisableDownloadCrc64Check = configuration.DisableDownloadCrc64Check,
+                CredentialsProvider = new StaticCredentialsProvider(accessKeyId, accessKeySecret),
+                HttpTransport = HttpTransport.Shared,
             });
     }
 
@@ -83,10 +91,10 @@ public class OssClientFactory : AliyunClientFactory<Client, AliyunBlobProviderCo
             new Configuration
             {
                 Region = regionId,
-                CredentialsProvider = new CredentialsProviderFunc(() =>
+                SignatureVersion = AliyunBlobProviderConfiguration.DefaultSignatureVersion,
-                {
+                InsecureSkipVerify = AliyunBlobProviderConfiguration.DefaultInsecureSkipVerify,
-                    return new Credentials(accessKeyId, accessKeySecret, securityToken, expiration);
+                CredentialsProvider = new StaticCredentialsProvider(accessKeyId, accessKeySecret, securityToken),
-                }),
+                HttpTransport = HttpTransport.Shared,
             });
     }
     /// <summary>
@@ -110,11 +118,18 @@ public class OssClientFactory : AliyunClientFactory<Client, AliyunBlobProviderCo
             new Configuration
             {
                 Region = regionId,
-                CredentialsProvider = new CredentialsProviderFunc(() =>
+                Endpoint = configuration.Endpoint,
-                {
+                SignatureVersion = configuration.SignatureVersion,
-                    return new Credentials(accessKeyId, accessKeySecret, securityToken, expiration);
-                }),
                 InsecureSkipVerify = configuration.InsecureSkipVerify,
+                UseCName = configuration.UseCName,
+                UsePathStyle = configuration.UsePathStyle,
+                UseAccelerateEndpoint = configuration.UseAccelerateEndpoint,
+                UseDualStackEndpoint = configuration.UseDualStackEndpoint,
+                UseInternalEndpoint = configuration.UseInternalEndpoint,
+                DisableUploadCrc64Check = configuration.DisableUploadCrc64Check,
+                DisableDownloadCrc64Check = configuration.DisableDownloadCrc64Check,
+                CredentialsProvider = new StaticCredentialsProvider(accessKeyId, accessKeySecret, securityToken),
+                HttpTransport = HttpTransport.Shared,
             });
     }
 }

aspnet-core/modules/blob-management/LINGYUN.Abp.BlobManagement.Aliyun/LINGYUN/Abp/BlobManagement/Aliyun/AliyunBlobProvider.cs

@@ -49,7 +49,7 @@ public class AliyunBlobProvider : IBlobProvider
         string name,
         CancellationToken cancellationToken = default)
     {
-        var client = await CreateClientAsync();
+        using var client = await CreateClientAsync();
         var bucket = NormalizeContainerName(name);
         var configuration = GetBlobConfiguration();
 
@@ -60,7 +60,7 @@ public class AliyunBlobProvider : IBlobProvider
         string name,
         CancellationToken cancellationToken = default)
     {
-        var ossClient = await CreateClientAsync();
+        using var ossClient = await CreateClientAsync();
         var bucket = NormalizeContainerName(name);
 
         if (!await BucketExists(ossClient, bucket, cancellationToken))
@@ -81,7 +81,7 @@ public class AliyunBlobProvider : IBlobProvider
         string blobName,
         CancellationToken cancellationToken = default)
     {
-        var ossClient = await CreateClientAsync();
+        using var ossClient = await CreateClientAsync();
         var bucket = NormalizeContainerName(containerName);
         var objectName = CalculateBlobName(blobName);
 
@@ -111,40 +111,39 @@ public class AliyunBlobProvider : IBlobProvider
         string blobName,
         CancellationToken cancellationToken = default)
     {
-        var ossClient = await CreateClientAsync();
+        //using var ossClient = await CreateClientAsync();
-        var bucket = NormalizeContainerName(containerName);
+        //var bucket = NormalizeContainerName(containerName);
-        var objectName = CalculateBlobName(blobName);
+        //var objectName = CalculateBlobName(blobName);
 
-        if (!await ObjectExists(ossClient, bucket, objectName, cancellationToken))
+        //if (!await ObjectExists(ossClient, bucket, objectName, cancellationToken))
-        {
+        //{
-            return null;
+        //    return null;
-        }
+        //}
 
-        var result = await ossClient.GetObjectAsync(
+        //var result = await ossClient.GetObjectAsync(
-            new GetObjectRequest
+        //    new GetObjectRequest
-            {
+        //    {
-                Bucket = bucket,
+        //        Bucket = bucket,
-                Key = blobName,
+        //        Key = objectName,
-            });
+        //    });
 
-        return result.Body;
+        //return result.Body;
 
-        // TODO: 阿里云sdk预签名不可用[2026/05/23]
+        var configuration = GetBlobConfiguration();
-        //var configuration = GetBlobConfiguration();
 
-        //var downloadUrl = await GeneratePresignedUrlAsync(
+        var downloadUrl = await InternalGeneratePresignedUrlAsync(
-        //    containerName,
+            containerName,
-        //    blobName,
+            blobName,
-        //    TimeSpan.FromSeconds(configuration.PresignedGetExpirySeconds),
+            TimeSpan.FromSeconds(configuration.PresignedGetExpirySeconds),
-        //    cancellationToken: cancellationToken);
+            cancellationToken: cancellationToken);
-        //if (downloadUrl.IsNullOrWhiteSpace())
+        if (downloadUrl.IsNullOrWhiteSpace())
-        //{
+        {
-        //    return null;
+            return null;
-        //}
+        }
 
-        //var httpClient = HttpClientFactory.CreateAliyunHttpClient();
+        var httpClient = HttpClientFactory.CreateAliyunHttpClient();
 
-        //return await httpClient.GetStreamAsync(downloadUrl, cancellationToken);
+        return await httpClient.GetStreamAsync(downloadUrl, cancellationToken);
     }
 
     public virtual Task<string?> GeneratePresignedUrlAsync(
@@ -154,32 +153,14 @@ public class AliyunBlobProvider : IBlobProvider
         bool isAttachmentContent = true,
         CancellationToken cancellationToken = default)
     {
-        // TODO: 阿里云sdk预签名不可用[2026/05/23]
+        // TODO: 阿里云SDK2.0不支持Bucket跨域配置, 不启用阿里云的预览方式
+        //return InternalGeneratePresignedUrlAsync(
+        //    containerName,
+        //    blobName,
+        //    expiration,
+        //    isAttachmentContent,
+        //    cancellationToken);
         return Task.FromResult<string?>(null);
-        //var ossClient = await CreateClientAsync();
-        //var bucket = NormalizeContainerName(containerName);
-        //var objectName = CalculateBlobName(blobName);
-
-        //if (!await ObjectExists(ossClient, bucket, objectName, cancellationToken))
-        //{
-        //    return null;
-        //}
-
-        //var fileName = Path.GetFileName(blobName);
-        //var type = isAttachmentContent ? "attachment" : "inline";
-        //var disposition = $"{type}; filename=\"{Uri.EscapeDataString(fileName)}\"; " +
-        //                     $"filename*=UTF-8''{Uri.EscapeDataString(fileName)}";
-
-        //var presignResult = ossClient.Presign(
-        //    new GetObjectRequest
-        //    {
-        //        Bucket = bucket,
-        //        Key = blobName,
-        //        ResponseContentDisposition = disposition,
-        //    },
-        //    Clock.Now.Add(expiration));
-
-        //return presignResult.Url;
     }
 
     public virtual Task CreateFolderAsync(
@@ -199,7 +180,7 @@ public class AliyunBlobProvider : IBlobProvider
         string? contentType = null,
         CancellationToken cancellationToken = default)
     {
-        var ossClient = await CreateClientAsync();
+        using var ossClient = await CreateClientAsync();
         var bucket = NormalizeContainerName(containerName);
         var objectName = CalculateBlobName(blobName);
         var configuration = GetBlobConfiguration();
@@ -241,20 +222,43 @@ public class AliyunBlobProvider : IBlobProvider
                 new PutBucketRequest
                 {
                     Bucket = bucket,
+                    Acl = bucketAcl?.GetString(),
                 },
                 cancellationToken: cancellationToken);
+        }
+    }
 
-            if (bucketAcl.HasValue)
+    protected async virtual Task<string?> InternalGeneratePresignedUrlAsync(
-            {
+        string containerName,
-                await ossClient.PutBucketAclAsync(
+        string blobName,
-                    new PutBucketAclRequest
+        TimeSpan expiration,
-                    {
+        bool isAttachmentContent = true,
-                        Bucket = bucket,
+        CancellationToken cancellationToken = default)
-                        Acl = bucketAcl.Value.GetString(),
+    {
-                    },
+        using var ossClient = await CreateClientAsync();
-                    cancellationToken: cancellationToken);
+        var bucket = NormalizeContainerName(containerName);
-            }
+        var objectName = CalculateBlobName(blobName);
+
+        if (!await ObjectExists(ossClient, bucket, objectName, cancellationToken))
+        {
+            return null;
         }
+
+        var fileName = Path.GetFileName(blobName);
+        var type = isAttachmentContent ? "attachment" : "inline";
+        var disposition = $"{type}; filename=\"{Uri.EscapeDataString(fileName)}\"; " +
+                             $"filename*=UTF-8''{Uri.EscapeDataString(fileName)}";
+
+        var presignResult = ossClient.Presign(
+            new GetObjectRequest
+            {
+                Bucket = bucket,
+                Key = objectName,
+                ResponseContentDisposition = disposition,
+            },
+            Clock.Now.Add(expiration));
+
+        return presignResult.Url;
     }
 
     protected async virtual Task<bool> BucketExists(

aspnet-core/modules/blob-management/LINGYUN.Abp.BlobManagement.Application/LINGYUN/Abp/BlobManagement/BlobAppServiceBase.cs

@@ -64,7 +64,11 @@ public abstract class BlobAppServiceBase : BlobManagementApplicationService
 
         var stream = await BlobManager.DownloadBlobsync(blob);
 
-        return new RemoteStreamContent(stream ?? Stream.Null, blob.Name, blob.ContentType, stream?.Length);
+        return new RemoteStreamContent(
+            stream ?? Stream.Null,
+            blob.Name, 
+            blob.ContentType, 
+            stream != null ? blob.Size : null);
     }
 
     public async virtual Task<BlobDto> GetAsync(Guid id)
@@ -169,7 +173,11 @@ public abstract class BlobAppServiceBase : BlobManagementApplicationService
 
         var stream = await BlobManager.DownloadBlobsync(blob);
 
-        return new RemoteStreamContent(stream ?? Stream.Null, blob.Name, blob.ContentType, stream?.Length);
+        return new RemoteStreamContent(
+            stream ?? Stream.Null,
+            blob.Name,
+            blob.ContentType,
+            stream != null ? blob.Size : null);
     }
 
     protected async virtual Task<string> GenerateDownloadUrlAsync(Guid id, string method, bool isAttachmentContent = true)

aspnet-core/modules/blob-management/LINGYUN.Abp.BlobManagement.Tencent/LINGYUN/Abp/BlobManagement/Tencent/TencentBlobProvider.cs

@@ -104,7 +104,7 @@ public class TencentBlobProvider : IBlobProvider
     {
         var configuration = await GetBlobConfiguration();
 
-        var downloadUrl = await GeneratePresignedUrlAsync(
+        var downloadUrl = await InternalGeneratePresignedUrlAsync(
             containerName, 
             blobName,
             TimeSpan.FromSeconds(configuration.PresignedGetExpirySeconds),
@@ -119,11 +119,61 @@ public class TencentBlobProvider : IBlobProvider
         return await httpClient.GetStreamAsync(downloadUrl, cancellationToken);
     }
 
-    public async virtual Task<string?> GeneratePresignedUrlAsync(
+    public virtual Task<string?> GeneratePresignedUrlAsync(
         string containerName,
         string blobName,
         TimeSpan expiration,
-       bool isAttachmentContent = true,
+        bool isAttachmentContent = true,
+        CancellationToken cancellationToken = default)
+    {
+        // TODO: 腾讯云需用户开通对象处理服务以支持预览, 不启用腾讯云的预览方式.
+        //return InternalGeneratePresignedUrlAsync(
+        //    containerName,
+        //    blobName,
+        //    expiration,
+        //    isAttachmentContent,
+        //    cancellationToken);
+
+        return Task.FromResult<string?>(null);
+    }
+
+    public virtual Task CreateFolderAsync(
+        string containerName, 
+        string blobName,
+        CancellationToken cancellationToken = default)
+    {
+        // 腾讯云Oss没有目录的概念,新建对象时可以模拟目录
+        // https://cloud.tencent.com/document/product/436/13324
+        return Task.CompletedTask;
+    }
+
+    public async virtual Task UploadBlobAsync(
+        string containerName, 
+        string blobName, 
+        Stream content,
+        string? contentType = null,
+        CancellationToken cancellationToken = default)
+    {
+        var client = await CreateClientAsync();
+        var bucket = NormalizeContainerName(containerName);
+        var objectName = CalculateBlobName(blobName);
+
+        CreateBucketIfNotExists(client, bucket);
+
+        var putObjectRequest = new PutObjectRequest(bucket, objectName, content);
+        if (!contentType.IsNullOrWhiteSpace())
+        {
+            putObjectRequest.SetRequestHeader("Content-Type", contentType);
+        }
+
+        client.PutObject(putObjectRequest);
+    }
+
+    protected async virtual Task<string?> InternalGeneratePresignedUrlAsync(
+        string containerName,
+        string blobName,
+        TimeSpan expiration,
+        bool isAttachmentContent = true,
         CancellationToken cancellationToken = default)
     {
         var client = await CreateClientAsync();
@@ -161,38 +211,6 @@ public class TencentBlobProvider : IBlobProvider
         return client.GenerateSignURL(preSignatureStruct);
     }
 
-    public virtual Task CreateFolderAsync(
-        string containerName, 
-        string blobName,
-        CancellationToken cancellationToken = default)
-    {
-        // 腾讯云Oss没有目录的概念,新建对象时可以模拟目录
-        // https://cloud.tencent.com/document/product/436/13324
-        return Task.CompletedTask;
-    }
-
-    public async virtual Task UploadBlobAsync(
-        string containerName, 
-        string blobName, 
-        Stream content,
-        string? contentType = null,
-        CancellationToken cancellationToken = default)
-    {
-        var client = await CreateClientAsync();
-        var bucket = NormalizeContainerName(containerName);
-        var objectName = CalculateBlobName(blobName);
-
-        CreateBucketIfNotExists(client, bucket);
-
-        var putObjectRequest = new PutObjectRequest(bucket, objectName, content);
-        if (!contentType.IsNullOrWhiteSpace())
-        {
-            putObjectRequest.SetRequestHeader("Content-Type", contentType);
-        }
-
-        client.PutObject(putObjectRequest);
-    }
-
     protected async virtual Task<CosXml> CreateClientAsync()
     {
         return await CosClientFactory.CreateAsync<BlobManagementContainer>();