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(VB.NET) Use an Azure Service SAS

Shows how to use an Azure Service SAS. (In this case, it is an SAS for a blob.)

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' Azure Blob Service Example: Upload binary bytes to a block blob.
' This uses a Service SAS for Authorization.

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim rest As New Chilkat.Rest

' Connect to the Azure Storage Blob Service
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
' In this example, the storage account name is "chilkat".
Dim success As Boolean = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' ----------------------------------------------------------------------------------------------
' The code above this comment could be placed inside a function/subroutine within the application
' because the connection does not need to be made for every request.  Once the connection is made
' the app may send many requests..
' ----------------------------------------------------------------------------------------------

' Note: The application does not need to explicitly set the following
' headers: Content-Length, x-ms-date, Authorization.  These headers
' are automatically set by Chilkat.

' Let's load a previously computed Azure Storage Account SAS token and use it.
' See How to Create an Azure Service SAS
Dim sbToken As New Chilkat.StringBuilder
success = sbToken.LoadFile("qa_data/tokens/azureStorageServiceSas.txt","utf-8")
If (success <> True) Then
    Debug.WriteLine("Failed to load SAS token.")
    Exit Sub
End If


' Add the Shared Access Signature query params for authorization.
rest.AddQueryParams(sbToken.GetAsString())

' IMPORTANT: Make sure to set the x-ms-blob-type header:
success = rest.AddHeader("x-ms-blob-type","BlockBlob")

' IMPORTANT: Make sure to add the x-ms-date header.
' When the header name is "x-ms-date", Chilkat will recognize the keyword "NOW" 
' and will substitute the current system date/time formatted as required by Microsoft.
success = rest.AddHeader("x-ms-date","NOW")

' For this example, we'll just load a JPG file into memory..
Dim binData As New Chilkat.BinData
success = binData.LoadFile("qa_data/jpg/starfish.jpg")
If (success <> True) Then
    Debug.WriteLine("Failed to load JPG file.")
    Exit Sub
End If


' Note: The maximum size of a block blob created by uploading in a single step is 64MB.  
' For larger files, the upload must be broken up into blocks.  There is another Chilkat example for that..
Dim sbResponse As New Chilkat.StringBuilder
success = rest.FullRequestBd("PUT","/mycontainer/starfish.jpg",binData,sbResponse)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' When successful, the Azure Storage service will respond with a 201 response status code,
' with no response body.
If (rest.ResponseStatusCode <> 201) Then
    ' Examine the request/response to see what happened.
    Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
    Debug.WriteLine("response status text = " & rest.ResponseStatusText)
    Debug.WriteLine("response header: " & rest.ResponseHeader)
    Debug.WriteLine("response body (if any): " & sbResponse.GetAsString())
    Debug.WriteLine("---")
    Debug.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine)
    Debug.WriteLine("LastRequestHeader: " & rest.LastRequestHeader)
    Debug.WriteLine("Failed.")
    Exit Sub
End If


Debug.WriteLine("Success.")

 

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