(Visual FoxPro) Upload using Azure Storage Account Shared Access Signature (SAS) Authorization

Sample code to upload binary bytes to a block blob in Azure Cloud Storage using an Azure Storage Account Shared Access Signature (SAS) Authorization. This creates a block blob, or replaces an existing block blob.

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..

Note: This example requires Chilkat v9.5.0.65 or later.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL lnSuccess
LOCAL loSbToken
LOCAL loBinData
LOCAL loSbResponse

* Note: This example requires Chilkat v9.5.0.65 or greater.

* Azure Blob Service Example: Upload binary bytes to a block blob.
* This uses a Shared Access Signature (SAS) for Authorization.
* This creates a new block blob or replaces an existing one in its entirety.
* See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')

* Connect to the Azure Storage Blob Service
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
* In this example, the storage account name is "chilkat".
lnSuccess = loRest.Connect("chilkat.blob.core.windows.net",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

* ----------------------------------------------------------------------------------------------
* 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 Storage Account Shared Access Signature
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbToken = CreateObject('Chilkat.StringBuilder')
lnSuccess = loSbToken.LoadFile("qa_data/tokens/azureStorageAccountSas.txt","utf-8")
IF (lnSuccess <> 1) THEN
    ? "Failed to load SAS token."
    RELEASE loRest
    RELEASE loSbToken
    CANCEL
ENDIF

* Add the Shared Access Signature query params for authorization.
loRest.AddQueryParams(loSbToken.GetAsString())

* IMPORTANT: Make sure to set the x-ms-blob-type header:
lnSuccess = loRest.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.
lnSuccess = loRest.AddHeader("x-ms-date","NOW")

* For this example, we'll just load a JPG file into memory..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBinData = CreateObject('Chilkat.BinData')
lnSuccess = loBinData.LoadFile("qa_data/jpg/starfish.jpg")
IF (lnSuccess <> 1) THEN
    ? "Failed to load JPG file."
    RELEASE loRest
    RELEASE loSbToken
    RELEASE loBinData
    CANCEL
ENDIF

* 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..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbResponse = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestBd("PUT","/mycontainer/starfish.jpg",loBinData,loSbResponse)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loSbToken
    RELEASE loBinData
    RELEASE loSbResponse
    CANCEL
ENDIF

* When successful, the Azure Storage service will respond with a 201 response status code,
* with no response body.
IF (loRest.ResponseStatusCode <> 201) THEN
    * Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body (if any): " + loSbResponse.GetAsString()
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
    ? "Failed."
    RELEASE loRest
    RELEASE loSbToken
    RELEASE loBinData
    RELEASE loSbResponse
    CANCEL
ENDIF

? "Success."

RELEASE loRest
RELEASE loSbToken
RELEASE loBinData
RELEASE loSbResponse