PS: Write To Table Storage

3 minute read

Description

Azure Storage Accounts can host table storage that scripts can use for temp or long term placement. In the move to replace VRO with Azure Automation, we decided to treat table storage similar to that of Resource Elements in VRO.

To Resolve

  1. Here are functions you can use:

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    Function Get-StorageAccountName
{
   $cred = Get-AutomationPSCredential -Name 'storage info'
   $val = $cred.UserName
   return $val
}

Function Get-StorageAccountKey
{
   $cred = Get-AutomationPSCredential -Name 'storage info'
   $val = $cred.GetNetworkCredential().Password
   return $val
}

$storageAccount = (Get-StorageAccountName)
$accesskey = (Get-StorageAccountKey)

   
function Get-AllRows($TableName)
{
   $version = "2017-04-17"
   $resource = "$tableName"
   $table_url = "https://$storageAccount.table.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
}

# Write-Output "Getting all rows"
# $tableItems = Get-AllRows -TableName "Workflows"


function Get-SingleRow($TableName, $PartitionKey, $RowKey)
{
   $version = "2017-04-17"
   $resource = "$tableName(PartitionKey='$PartitionKey',RowKey='$Rowkey')"
   $table_url = "https://$storageAccount.table.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
}

# Write-Output "Getting single row"
# $tableItem = Get-SingleRow -TableName "Workflows" -RowKey "example-service-now-info" -PartitionKey "REQ00000346"
   
function New-Row($TableName, $PartitionKey, $RowKey, $Entity)
{
   $version = "2017-04-17"
   $resource = "$tableName(PartitionKey='$PartitionKey',RowKey='$Rowkey')"
   $table_url = "https://$storageAccount.table.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"
   }
   $body = $entity | ConvertTo-Json
   $item = Invoke-RestMethod -Method PUT -Uri $table_url -Headers $headers -Body $body -ContentType application/json
}

<#
Write-Output "Creating a new table entity"
$body = @{
   RowKey       = "example-service-now-info"
   PartitionKey = "REQ00000346"
   Status       = "waiting"
   Value        = '{ "blah" = "bob"}'
}
New-Row -TableName "Workflows" -RowKey "example-service-now-info" -PartitionKey "REQ00000346" -entity $body
#>

function Update-Row($TableName, $PartitionKey, $RowKey, $entity)
{
   $version = "2017-04-17"
   $resource = "$tableName(PartitionKey='$PartitionKey',RowKey='$Rowkey')"
   $table_url = "https://$storageAccount.table.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)
   $body = $entity | ConvertTo-Json
   $headers = @{
      'x-ms-date'      = $GMTTime
      Authorization    = "SharedKeyLite " + $storageAccount + ":" + $signature
      "x-ms-version"   = $version
      Accept           = "application/json;odata=minimalmetadata"
      'If-Match'       = "*"
      'Content-Length' = $body.length
   }
   $item = Invoke-RestMethod -Method MERGE -Uri $table_url -Headers $headers -ContentType application/json -Body $body
   
}

<#
Write-Output "Merging with an existing table entity"
$body = @{
   RowKey       = "example-service-now-info"
   PartitionKey = "REQ00000346"
   Status       = "waiting"
   Value        = '{ "blah" = "bob"}'
}
Update-Row -TableName "Workflows" -RowKey "example-service-now-info" -PartitionKey "REQ00000346" -entity $body
#>
   
function Remove-Row($TableName, $PartitionKey, $RowKey)
{
   $version = "2017-04-17"
   $resource = "$tableName(PartitionKey='$PartitionKey',RowKey='$Rowkey')"
   $table_url = "https://$storageAccount.table.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=minimalmetadata"
      'If-Match'     = "*"
   }
   $item = Invoke-RestMethod -Method DELETE -Uri $table_url -Headers $headers -ContentType application/http
   
}
# Write-Output "Deleting an existing table row"
# Remove-Row -TableName "Workflows" -RowKey "example-service-now-info" -PartitionKey "REQ00000346"

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