[Azure Storage] How to call Storage API’s from Powershell (without SDK)

Article
04/06/2017

Recently I had this ask from a partner who wanted sample code for making REST API call to storage without our SDK’s route. Though we have array of SDK’s supporting many languages, still he wanted to make clean REST calls without SDK’s. It some time to understand and create this proof of concept. So sharing here to easy reference. Hope this helps in some way..

$accountname="your_storage_accname"

$key = "acc_key"

$container="container_name"

#file to create

$blkblob="samplefile.log"

$f = "C:\\temp\\samplefile.log"

$BlobOperation = "PUT"

$body = (Get-Content -Path $f -Raw)

~~$filelen = $body.Length~~

#added this per comments in the below blog post.

$filelen = (Get-ChildItem -File $f).Length

$RESTAPI_URL = "https://$accountname.blob.core.windows.net/$container/$blkblob";

$date=(Get-Date).ToUniversalTime()

$datestr=$date.ToString("R");

$datestr2=$date.ToString("s")+"Z";

$strtosign = "$BlobOperation`n`n`n$filelen`n`n`n`n`n`n`n`n`nx-ms-blob-type:BlockBlob`nx-ms-date:$datestr`nx-ms-version:2015-04-05`n/"

$strtosign = $strtosign + $accountname + "/"

$strtosign = $strtosign + $container

$strtosign = $strtosign + "/" +$blkblob

write-host $strtosign

[byte[]]$dataBytes = ([System.Text.Encoding]::UTF8).GetBytes($strtosign)

$hmacsha256 = New-Object System.Security.Cryptography.HMACSHA256

$hmacsha256.Key = [Convert]::FromBase64String($key)

$sig = [Convert]::ToBase64String($hmacsha256.ComputeHash($dataBytes))

$authhdr = "SharedKey $accountname`:$sig"

write-host $authhdr

$RequestHeader = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"

$RequestHeader.Add("Authorization", $authhdr)

$RequestHeader.Add("x-ms-date", $datestr)

$RequestHeader.Add("x-ms-version", "2015-04-05")

$RequestHeader.Add("x-ms-blob-type","BlockBlob")

#create a new PS object to hold the response JSON

$RESTResponse = New-Object PSObject;

$RESTResponse = (Invoke-RestMethod -Uri $RESTAPI_URL -Method put -Headers $RequestHeader -InFile $f);

write-host $RESTResponse

write-host "# Success !!! uploaded the file >>" $RESTAPI_URL

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