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+# Orignial Script https://github.com/Azure-Samples/powerbi-powershell/blob/master/Zero-Downtime-Capacity-Scale.ps1 migrated to use Az modules
+
+# This runbook requires the following Powershell Modules:
+# MicrosoftPowerBIMgmt.Profile
+# Az.Accounts
+# Az.PowerBIEmbedded
+
+# This sample script calls the Power BI API and ARM REST API to programmatically scale capacity resource with no downtime (i.e. embedded content is available during the scaling process).
+# It also provides an option to reassign workspaces from one capacity resource to another.
+# The procedure creates a temporary capacity resource and reassigns the workspaces to it during the scaling process.
+# Once the procedure is completed, the workspaces are assigned back to the original capacity resource and the temporary capacity resource is deleted.
+#
+#
+#                                                             MAIN		    TEMP
+#                                                          ==========            ==========
+#                                                         |  SKU-X   |          | TEMPORARY|          
+#       STEP 1 - Create temporary capacity                |          |		| CAPACITY |
+#                                                     	  |WORKSPACES|          | 	   |	
+#                                                          ==========            ==========
+#                                                                           
+#                                                          ==========            ==========
+#                                                         |          |          | TEMPORARY|
+#       STEP 2 - Reassign workspaces to temporary capacity|  SKU-X   |--------->| CAPACITY,| 
+#                                                         |          |          |WORKSPACES|
+#                                                          ==========            ==========
+#
+#                                                          ==========            ==========
+#                                                         |          |          | TEMPORARY|
+#       STEP 3 - Scale main capacity                      | SCALING  |          | CAPACITY,|
+#                                                         |          |          |WORKSPACES|
+#                                                          ==========            ==========
+#                                                                           
+#                                                          ==========            ==========
+#                                                         |  SKU-Y   |          | TEMPORARY|         
+#       STEP 4 - Assign workspaces back to main capacity  |  	     |<---------| CAPACITY |
+#                                                         |WORKSPACES|          | 	   |
+#                                                          ==========            ==========
+#                                                             
+#                                                          ==========            ==========
+#                                                         |  SKU-Y   |          |          |
+#       STEP 5 - Delete temporary capacity                |          |          |  DELETED |
+#                                                         |WORKSPACES|          |          |
+#                                                          ==========            ==========
+
+# For more information, see the accompanying blog post:
+# TODO : Add link to blog
+
+# Instructions:
+# 3. Follow the instructions below to fill in the client ID
+#    Make sure the applicationId is the Administrator on Power BI Embeded and Workspace
+#    This runbook is using the Azure Account Manged Identity as ApplicationId 
+#    in case you would like to use a different Application Id comment out the line 69-72 and 235 and then comment the line 242
+# Parameters - fill these in before running the script!
+# ======================================================
+
+# AAD Client ID:
+# To get this, go to the following page and follow the steps to register an app
+# https://app.powerbi.com/embedsetup/AppOwnsData
+# To get the sample to work, ensure that you have the following fields:
+# App Type: Native app
+# Redirect URL: urn:ietf:wg:oauth:2.0:oob
+# Level of access: check all boxes
+
+
+
+
+Param
+(
+  # [Parameter (Mandatory= $false)] 
+  #[String] $clientId = "FILL ME IN",
+  # [Parameter (Mandatory= $false)]
+  # [String] $secret = "FILL ME IN",
+  [Parameter (Mandatory= $false)]
+  [String] $CapacityName = "FILL ME IN",
+  [Parameter (Mandatory= $false)]
+  [String] $CapacityResourceGroup = "FILL ME IN",
+  [Parameter (Mandatory= $false)]
+  [String] $TargetSku = "A1"
+  
+  
+)
+
+
+
+
+# Start watch to measure E2E time duration
+$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
+
+
+# Ensures you do not inherit an AzContext in your runbook
+Disable-AzContextAutosave –Scope Process
+
+$connection = Get-AutomationConnection -Name AzureRunAsConnection
+
+# Wrap authentication in retry logic for transient network failures
+$logonAttempt = 0
+while(!($connectionResult) -and ($logonAttempt -le 2))
+{
+    $LogonAttempt++
+    # Logging in to Azure...
+    $connectionResult = Connect-AzAccount `
+                            -ServicePrincipal `
+                            -Tenant $connection.TenantID `
+                            -ApplicationId $connection.ApplicationID `
+                            -CertificateThumbprint $connection.CertificateThumbprint
+
+    Start-Sleep -Seconds 30
+}
+
+
+$AzureContext = Get-AzSubscription -SubscriptionId $connection.SubscriptionID
+
+
+# =====================================================
+# Helper function used for validation capacity in Active state
+# Make sure the applicationId is the Administrator on Power BI Embeded and Workspace
+FUNCTION ValidateCapacityInActiveState($capacity_name, $resource_group)
+{
+    # Get capacity and validate its in active state
+    $getCapacityResult = Get-AzPowerBIEmbeddedCapacity -Name $capacity_name -ResourceGroup $resource_group
+    
+    IF (!$getCapacityResult -OR $getCapacityResult -eq "")
+    {
+        $errmsg = "Capacity " + $capacity_name +" was not found!"
+        Write-Error -Message $errmsg
+        Break Script
+    }
+    ELSEIF ($getCapacityResult.State.ToString() -ne "Succeeded") 
+    {
+        $errmsg = "Capacity " + $capacity_name + " is not in active state!"
+        Write-Error $errmsg
+        Break Script
+    }
+
+    return $getCapacityResult
+}
+
+# =====================================================
+# Helper function used for assigning workspaces from source to target capacity
+FUNCTION AssignWorkspacesToCapacity($source_capacity_objectid, $target_capacity_objectid)
+{
+    $getCapacityGroupsUri = $apiUri + "groups?$" + "filter=capacityId eq " + "'$source_capacity_objectid'"
+    $capacityWorkspaces = Invoke-RestMethod -Method GET -Headers $auth_header -Uri $getCapacityGroupsUri
+
+    # Assign workspaces to temporary capacity
+    $capacityWorkspaces.value | ForEach-Object -Process {          
+      Write-Output ">>> Assigning workspace Name:" $_.name " Id:" $_.id "to capacity id:" $target_capacity_objectid
+      $assignToCapacityUri = $apiUri + "groups/" + $_.id + "/AssignToCapacity"
+      $assignToCapacityBody = @{capacityId=$target_capacity_objectid} | ConvertTo-Json
+      Invoke-RestMethod -Method Post -Headers $auth_header -Uri $assignToCapacityUri -Body $assignToCapacityBody -ContentType 'application/json'
+
+      # Validate workspace to capacity assignment status was completed successfully, if not then exit script
+      DO
+      {
+        $assignToCapacityStatusUri = $apiUri + "groups/" + $_.id + "/CapacityAssignmentStatus"
+        $status = Invoke-RestMethod -Method Get -Headers $auth_header -Uri $assignToCapacityStatusUri
+
+        # Exit script if workspace assignment has failed
+        IF ($status.status -eq 'AssignmentFailed')
+        {
+          $errmsg = "workspace " +  $_.id + " assignment has failed!, script will stop."
+          Break Script
+        }
+        
+        Start-Sleep -Milliseconds 200
+
+        Write-Output ">>> Assigning workspace Id:" $_.id "to capacity id:" $target_capacity_objectid "Status:" $status.status
+      } while ($status.status -ne 'CompletedSuccessfully')
+    }
+
+    $getCapacityGroupsUri = $apiUri + "groups?$" + "filter=capacityId eq " + "'$target_capacity_objectid'"
+    $capacityWorkspaces = Invoke-RestMethod -Method GET -Headers $auth_header -Uri $getCapacityGroupsUri
+
+    return $capacityWorkspaces
+}
+
+# =====================================================
+# Helper function used for gettting the capacity object ID by capacity Name
+FUNCTION GetCapacityObjectID($capacitiesList, $capacity_name) 
+{
+    $done = $False 
+    
+    # loop over capacitis list and find the right capacity by name
+    $capacitiesList.value | ForEach-Object -Process {
+        # Find main capacity ID
+        if ($_.DisplayName -eq $capacity_name)
+        {
+            Write-Output ">>> Object ID for" $capacity_name  "is" $_.id
+            $done = $True
+            return $_.id
+        }
+    }
+
+    # If capacity was not found then print error and exit
+    IF ($done -ne $True) {
+        $errmsg = "Capacity " + $capacity_name + " object ID was not found!"
+        Write-Error $errmsg
+        Break Script
+    }
+}
+
+
+
+# =====================================================
+# Get authentication token for PowerBI API 
+# Make sure the applicationId is the Administrator on Power BI Embeded and Workspace
+FUNCTION GetAuthTokenForApplicationId ($applicationId, $secret)
+{
+    $securePassword = $secret | ConvertTo-SecureString -AsPlainText -Force
+    $credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $applicationId, $securePassword
+    Connect-PowerBIServiceAccount -ServicePrincipal -Credential $credential -TenantId $connection.TenantID
+    $headers = Get-PowerBIAccessToken
+    return $headers
+}
+
+# =====================================================
+# Get authentication token for PowerBI API 
+# Make sure the applicationId for this runbook is the Administrator on Power BI Embeded and Workspace
+FUNCTION GetAuthToken
+{
+    Connect-PowerBIServiceAccount -ServicePrincipal `
+                            -Tenant $connection.TenantID `
+                            -ApplicationId $connection.ApplicationID `
+                            -CertificateThumbprint $connection.CertificateThumbprint
+
+    $headers = Get-PowerBIAccessToken
+    return $headers
+}
+
+
+# =====================================================
+# If the applicationId is different from the runbook configure: $token = GetAuthTokenForApplicationId
+# $clientId = "FILL ME IN"
+# $secret = "FILL ME IN"
+# $token = GetAuthTokenForApplicationId $clientId $secret
+# =====================================================
+
+
+$apiUri = "https://api.powerbi.com/v1.0/myorg/"
+
+
+$token = GetAuthToken 
+
+# =====================================================
+# Building Rest API header with authorization token
+$auth_header = @{
+   'Content-Type'='application/json'
+   'Authorization'=$token.Values
+}
+
+# =====================================================
+
+
+
+# Get and Validate main capacity is in active state
+$mainCapacity = ValidateCapacityInActiveState $CapacityName $CapacityResourceGroup
+
+Write-Output " "
+Write-Output "========================================================================================================================"
+Write-Output "                                           SCALING CAPACITY FROM" $mainCapacity.Sku "To" $TargetSku
+Write-Output "========================================================================================================================"
+Write-Output " "
+Write-Output ">>> Capacity" $CapacityName "is available and ready for scaling!"
+
+# Create new temporary capacity to be used for scale
+$guid = New-Guid
+$temporaryCapacityName = 'tmpcapacity' + $guid.ToString().Replace('-','s').ToLowerInvariant()
+$temporarycapacityResourceGroup = $mainCapacity.ResourceGroup
+
+Write-Output ">>> STEP 1 - Creating a temporary capacity name:"$temporaryCapacityName
+
+$newcap = New-AzPowerBIEmbeddedCapacity -ResourceGroupName $temporarycapacityResourceGroup -Name $temporaryCapacityName -Location $mainCapacity.Location -Sku $TargetSku -Administrator $mainCapacity.Administrator
+
+# Check if new capacity provisioning succeeded
+IF (!$newcap -OR $newcap.State.ToString() -ne 'Succeeded') 
+{
+    Remove-AzPowerBIEmbeddedCapacity -Name $temporaryCapacityName -ResourceGroupName $temporarycapacityResourceGroup    
+    $errmsg = "Try to remove temporary capacity due to some failure while provisioning!, Please restart script!"
+    Write-Error -Message $errmsg	
+    Break Script
+}
+
+# Get capacities from PowerBI to find the capacities ID
+$getCapacityUri = $apiUri + "capacities"
+$capacitiesList = Invoke-RestMethod -Method Get -Headers $auth_header -Uri $getCapacityUri
+$sourceCapacityObjectId = GetCapacityObjectID $capacitiesList $CapacityName
+$targetCapacityObjectId = GetCapacityObjectID $capacitiesList $temporaryCapacityName
+Write-Output ">>> STEP 1 - Completed!"
+
+Write-Output ">>> STEP 2 - Assigning workspaces"
+$assignedMainCapacityWorkspaces = AssignWorkspacesToCapacity $sourceCapacityObjectId $targetCapacityObjectId
+Write-Output ">>> STEP 2 Completed!"
+
+Write-Output ">>> STEP 3 - Scaling capacity " $CapacityName "to" $targetSku
+Update-AzPowerBIEmbeddedCapacity -Name $CapacityName -Sku $targetSku -resourceGroup $CapacityResourceGroup
+#Update-AzureRmPowerBIEmbeddedCapacity -Name $CapacityName -sku $targetSku        
+$mainCapacity = ValidateCapacityInActiveState $CapacityName $CapacityResourceGroup
+Write-Output ">>> STEP 3 completed!" $CapacityName "to" $targetSku
+
+Write-Output " "
+Write-Output ">>> STEP 4 - Assigning workspaces to main capacity"
+$AssignedTargetCapacityWorkspaces = AssignWorkspacesToCapacity $targetCapacityObjectId $sourceCapacityObjectId
+
+# validate all workspaces were assigned back to the main capacity
+$diff =  Compare-Object $AssignedTargetCapacityWorkspaces.value $assignedMainCapacityWorkspaces.value
+if ($diff -ne $null)
+{  
+    $errmsg = "Something went wrong while assigning workspaces to the main capacity, Please re-execute the script"
+    Write-Error -Message $errmsg
+    Break Script
+}
+Write-Output ">>> STEP 4 Completed!"
+Write-Output " "
+Write-Output ">>> STEP 5 - Delete temporary capacity"
+# Delete temporary capacity if it was newly created
+Remove-AzPowerBIEmbeddedCapacity -Name $temporaryCapacityName -ResourceGroupName $temporarycapacityResourceGroup
+Write-Output ">>> STEP 5 Completed!"
+
+Write-Output " "
+Write-Output "========================================================================================================================"
+Write-Output "                                           Completed Successfully"
+Write-Output "                                              Total Duration"
+Write-Output "                                            "$stopwatch.Elapsed
+Write-Output "========================================================================================================================"