嘗試在Web API請求上檢索Azure blob時出現403錯誤

Question

我想通過身份驗證（通過JWT）GET請求返回存儲在Azure blob中的映像。當我在本地機器上運行項目並使用郵遞員來請求圖像並且請求經過並且我得到我要求的圖像時。但是，一旦我將代碼部署到Azure並擊中同一個端點，我就會得到一個403.代碼在我試圖調用DownloadToStreamAsync的那一行失敗。這裏是我使用的代碼：

public async Task<BlobDownloadModel> DownloadBlob(Guid blobId) 
    { 
     try 
     { 
      //get picture record 
      Picture file = await _media.GetPictureAsync(blobId); 

      await _log.CreateLogEntryAsync("got picture record"); 

      // get string format blob name 
      var blobName = file.PictureId.ToString() + file.Extension; 

      await _log.CreateLogEntryAsync("got name of blob " + blobName); 

      if (!String.IsNullOrEmpty(blobName)) 
      { 
       await _log.CreateLogEntryAsync("blob not empty"); 

       var blob = _container.GetBlockBlobReference(blobName); 

       await _log.CreateLogEntryAsync("got blob: " + blob.ToString()); 

       var ms = new MemoryStream(); 

       await blob.DownloadToStreamAsync(ms); 

       await _log.CreateLogEntryAsync("blob downloaded to memory stream"); 

       var lastPos = blob.Name.LastIndexOf('/'); 
       var fileName = blob.Name.Substring(lastPos + 1, blob.Name.Length - lastPos - 1); 

       var download = new BlobDownloadModel 
       { 
        BlobStream = ms, 
        BlobFileName = fileName, 
        BlobLength = blob.Properties.Length, 
        BlobContentType = blob.Properties.ContentType 
       }; 

       return download; 
      } 
     } 
     catch(Exception ex) 
     { 
      await _log.CreateLogEntryAsync("exception thrown: " + ex.ToString()); 
     } 

我將不勝感激任何幫助，我可以得到。

UPDATE：

我改變了我的代碼，這一點，並試圖再次：

public async Task<AzureBlobModel> DownloadBlob(Guid blobId) 
    { 
     try 
     { 
      //get picture record 
      Picture file = await _media.GetPictureAsync(blobId); 

      await _log.CreateLogEntryAsync("got picture record"); 

      // get string format blob name 
      var blobName = file.PictureId.ToString() + file.Extension; 

      await _log.CreateLogEntryAsync("got name of blob " + blobName); 

      if (!String.IsNullOrEmpty(blobName)) 
      { 
       await _log.CreateLogEntryAsync("blob not empty"); 

       var blob = _container.GetBlockBlobReference(blobName); 

       await _log.CreateLogEntryAsync("got blob: " + blob.ToString()); 

       // Strip off any folder structure so the file name is just the file name 
       var lastPos = blob.Name.LastIndexOf('/'); 
       var fileName = blob.Name.Substring(lastPos + 1, blob.Name.Length - lastPos - 1); 

       await _log.CreateLogEntryAsync("got fileName: " + fileName); 

       //await blob.DownloadToStreamAsync(ms); 

       await _log.CreateLogEntryAsync("about to open read stream"); 

       var stream = await blob.OpenReadAsync(); 

       await _log.CreateLogEntryAsync("opened read stream"); 

       var result = new AzureBlobModel() 
       { 
        FileName = fileName, 
        FileSize = blob.Properties.Length, 
        Stream = stream, 
        ContentType = blob.Properties.ContentType 
       }; 

       await _log.CreateLogEntryAsync("blob downloaded to memory stream"); 

       return result; 

       // Build and return the download model with the blob stream and its relevant info 
       //var download = new BlobDownloadModel 
       //{ 
       // BlobStream = ms, 
       // BlobFileName = fileName, 
       // BlobLength = blob.Properties.Length, 
       // BlobContentType = blob.Properties.ContentType 
       //}; 

       //return download; 
      } 
     } 
     catch(Exception ex) 
     { 
      await _log.CreateLogEntryAsync("exception thrown: " + ex.ToString()); 
     } 

     await _log.CreateLogEntryAsync("returning null"); 

     // Otherwise 
     return null; 
    } 

從日誌中進行最後一次嘗試的結果是這樣的：

請求，接收並驗證，時間戳UTC：2017/3/10 5:28:26 - 5:28:26 AM
收到的ID：b3bc7faf-0c86-4ce2-af84-30636825a485 - 5:28:27 AM
得到的圖片記錄-5：28：27 AM
了Blob的名稱b3bc7faf-0c86-4ce2-af84-30636825a485.JPG - 上午05時28分27秒
一滴不爲空 - 上午05時28分27秒
了一滴：Microsoft.WindowsAzure.Storage.Blob.CloudBlockBlob - 上午05點28分27秒
了文件名：b3bc7faf-0c86-4ce2-af84-30636825a485.JPG - 上午05點28分27秒
即將開啓讀取流 - 5 ：28：27上午

我能夠檢索文件/ blob的名稱，消除了錯誤的帳戶密鑰作爲問題的罪魁禍首。

SOLUTION

我能得到我的代碼用下面的代碼工作：

public async Task<AzureBlobModel> DownloadBlob(Guid blobId) 
    { 
     try 
     { 
      //get picture record 
      Picture file = await _media.GetPictureAsync(blobId); 

      // get string format blob name 
      var blobName = file.PictureId.ToString() + file.Extension; 

      if (!String.IsNullOrEmpty(blobName)) 
      { 
       var blob = _container.GetBlockBlobReference(blobName); 

       // Strip off any folder structure so the file name is just the file name 
       var lastPos = blob.Name.LastIndexOf('/'); 
       var fileName = blob.Name.Substring(lastPos + 1, blob.Name.Length - lastPos - 1); 

       var fileLength = blob.Properties.Length; 
       var stream = await blob.OpenReadAsync(); 

       var result = new AzureBlobModel() 
       { 
        FileName = fileName, 
        FileSize = blob.Properties.Length, 
        Stream = stream, 
        ContentType = blob.Properties.ContentType 
       }; 

       return result; 
      } 
     } 
     catch(Exception ex) 
     { 
      await _log.CreateLogEntryAsync("exception thrown: " + ex.ToString()); 
     } 

     await _log.CreateLogEntryAsync("returning null"); 

     // Otherwise 
     return null; 
    } 

Answer 1

我能夠解決通過使用下面的代碼的問題：

public async Task<AzureBlobModel> DownloadBlob(Guid blobId) 
    { 
     try 
     { 
      //get picture record 
      Picture file = await _media.GetPictureAsync(blobId); 

      // get string format blob name 
      var blobName = file.PictureId.ToString() + file.Extension; 

      if (!String.IsNullOrEmpty(blobName)) 
      { 
       var blob = _container.GetBlockBlobReference(blobName); 

       // Strip off any folder structure so the file name is just the file name 
       var lastPos = blob.Name.LastIndexOf('/'); 
       var fileName = blob.Name.Substring(lastPos + 1, blob.Name.Length - lastPos - 1); 

       var fileLength = blob.Properties.Length; 
       var stream = await blob.OpenReadAsync(); 

       var result = new AzureBlobModel() 
       { 
        FileName = fileName, 
        FileSize = blob.Properties.Length, 
        Stream = stream, 
        ContentType = blob.Properties.ContentType 
       }; 

       return result; 
      } 
     } 
     catch(Exception ex) 
     { 
      await _log.CreateLogEntryAsync("exception thrown: " + ex.ToString()); 
     } 

     await _log.CreateLogEntryAsync("returning null"); 

     // Otherwise 
     return null; 
    } 

Answer 2

但是，一旦我將代碼部署到Azure和打同樣的終點，我得到一個403.

首先，請檢查您的Azure帳戶和密鑰，以確保它們是正確的。其次，請檢查服務器上的時鐘。存儲服務確保請求到達服務時間不超過15分鐘。如果服務器上的時間不與存儲服務器同步，則會出現403錯誤。