Unable to Get Blob using powershell - powershell

Question

I have been trying to GET Blob using the script below but it gives an error highlighted below. I am using the script from this link and the $signatureString is used according to the this link. In a way, what i understand from technet that the authorization header should have the following
Convert the PS data to JSON
$json = $authHeader | ConvertTo-Json
$method = "GET"
$headerDate = (get-date -format r).ToString()
$headers = #{"x-ms-version"="$headerDate"}
$StorageAccountName = ""
$StorageContainerName = "users"
$StorageAccountKey = ""
$Url = "https://$StorageAccountName.blob.core.windows.net/$StorageContainerName/******/*****.rdp"
$body = "Hello world"
$xmsdate = (get-date -format r).ToString()
$headers.Add("x-ms-date",$xmsdate)
$contentLength = $body.Length
$headers.Add("Content-Length","$contentLength")
$headers.Add("x-ms-blob-type","BlockBlob")
$contentType = "application/json"
#$headers.Add("Content-Type","$contentType")
$signatureString = "$method$([char]10)$([char]10)$([char]10)$contentLength$([char]10)$([char]10)$([char]10)$([char]10)$([char]10)$([char]10)$([char]10)$([char]10)$([char]10)"
#Add CanonicalizedHeaders
$signatureString += "x-ms-blob-type:" + $headers["x-ms-blob-type"] + "$([char]10)"
$signatureString += "x-ms-date:" + $headers["x-ms-date"] + "$([char]10)"
$signatureString += "x-ms-version:" + $headers["x-ms-version"] + "$([char]10)"
#Add CanonicalizedResource
$uri = New-Object System.Uri -ArgumentList $url
$signatureString += "/" + $StorageAccountName + $uri.AbsolutePath + $([char]10) + "restype:container"
$dataToMac = [System.Text.Encoding]::UTF8.GetBytes($signatureString)
$accountKeyBytes = [System.Convert]::FromBase64String($StorageAccountKey)
$hmac = new-object System.Security.Cryptography.HMACSHA256((,$accountKeyBytes))
$signature = [System.Convert]::ToBase64String($hmac.ComputeHash($dataToMac))
$headers.Add("Authorization", "SharedKey " + $StorageAccountName + ":" + $signature);
write-host -fore green $signatureString
write-host -fore green $headers
Invoke-RestMethod -Uri $Url -Method $method -headers $headers
Please someone assist me on this.
I am sorry! yes it was not that descriptive. here is the screenshot
InvalidHeaderValue-Incorrect format
I am actually trying to access azure blob storage using powerShell. today, i tried other script to do the same but I get a different error, please see the script and screenshot of that error message below.
$storageAccount = ""
$accesskey = ""
$version = "2017-04-17"
$resource = "tets"
$table_url = "https://$storageAccount.blob.core.windows.net/$resource"
$GMTTime = (Get-Date).ToUniversalTime().toString('R')
$stringToSign = "$GMTTime`n/$storageAccount/$resource"
$hmacsha = New-Object System.Security.Cryptography.HMACSHA256
$hmacsha.key = [Convert]::FromBase64String($accesskey)
$signature = $hmacsha.ComputeHash([Text.Encoding]::UTF8.GetBytes($stringToSign))
$signature = [Convert]::ToBase64String($signature)
$headers = #{
'x-ms-date' = $GMTTime
Authorization = "SharedKeyLite " + $storageAccount + ":" + $signature
"x-ms-version" = $version
Accept = "application/json;odata=fullmetadata"
}
$item = Invoke-RestMethod -Method GET -Uri $table_url -Headers $headers -ContentType application/json
return $item.value
Here is the error message I get.
AuthenticationFailedServer

Answer 1

Consider using the Azure PowerShell modules to access blobs rather than raw API requests. All of the authentication details should be handled for you already.