AZ CLI putting message on a storage queue – not a valid Base-64 string


Using Az CLI a lot recently, it has made interactions with Azure so much easier using PowerShell.

https://docs.microsoft.com/en-us/cli/azure/install-azure-cli?view=azure-cli-latest

I had to write a simple PowerShell script that added items to a Storage queue. Once the items were added to a queue an Azure function picked up the items and processed them.

According to the documentation of Azure CLI you need to use az storage message put.

#Login
az login
#Get the connection string
$connectionString = az storage account show-connection-string --name "mystorageaccountname" –resource-group "MyResourceGroup" --query connectionString | ForEach-Object { $PSItem -join '' } | ConvertFrom-Json
#Create message
$message = "{""Name"":""Paul"",""LastName"":""Matthews"",""ID"":""d4b2ffc9-4380-46e4-a0bf-8a9ca58734d2""}"
#Add item to the queue
az storage message put --content $message --queue-name "myQueueName" --connection-string $connectionString

This fires successfully and I can see the item on the queue. However, when my Azure Function starts to run, I get the error message:

The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.

To solve this problem you just need to convert the string.

#Login
az login
#Get the connection string
$connectionString = az storage account show-connection-string --name "mystorageaccountname" –resource-group "MyResourceGroup" --query connectionString | ForEach-Object { $PSItem -join '' } | ConvertFrom-Json
#Create message
$message = "{""Name"":""Paul"",""LastName"":""Matthews"",""ID"":""d4b2ffc9-4380-46e4-a0bf-8a9ca58734d2""}"
#Encode to bytes
$b = [System.Text.Encoding]::UTF8.GetBytes($message)
#Convert to Base64String
$message64Base = [System.Convert]::ToBase64String($b)
#Add item to the queue
az storage message put --content $message64Base --queue-name "myQueueName" --connection-string $connectionString

Amazingly the value you push upto the queue is something like below:

“eyJOYW1lIjoiUGF1bCIsIkxhc3ROYW1lIjoiTWF0dGhld3MiLCJJRCI6ImQ0YjJmZmM5LTQzODAtNDZlNC1hMGJmLThhOWNhNTg3MzRkMiJ9”

But it appears on the queue correctly.

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