Hi All,

Today, I got an opportunity to write PowerShell script to add our custom theme to the Tenant. So thought to be share with all of us.

I Put detailed comments, tried to be self explanatory.

<#
.SYNOPSIS
Ensures that the our theme is added to tenant

.PARAMETER CredentialFilePath
 Office 365 system account credential file path having two lines in following format
 UserName
 Password

 .PARAMETER TenantAdminURL
 Office 365 tenant admin site URL

 .PARAMETER ThemeJSONFilePath
 Path of theme.json file

  .PARAMETER ThemeName
 Name of Theme
#>

param
(
	[parameter(Mandatory=$true)][string]$CredentialFilePath,
    [parameter(Mandatory=$true)][string]$TenantAdminURL,
    [parameter(Mandatory=$true)][string]$ThemeJSONFilePath,
    [parameter(Mandatory=$true)][string]$ThemeName
)

if(-not(Get-PSSnapin | Where { $_.Name -eq "Microsoft.SharePoint.PowerShell"}))
{
	Add-PSSnapin Microsoft.SharePoint.PowerShell;
}

#Get the user credential file path and getting user from it
$user = Get-Content $CredentialFilePath | Select-Object -First 1
#Getting password
$password = Get-Content $CredentialFilePath | Select-Object -First 1 -Skip 1
$securePassword = ConvertTo-SecureString $Password -AsPlainText -Force 

#Connect to Office 365
$spoManagementCred = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $user, $securePassword
Connect-SPOService -Url $TenantAdminURL -Credential $spoManagementCred

#Get the theme JSON
$json = Get-Content $ThemeJSONFilePath -Raw -ErrorAction Stop
$jsonObj = $json | ConvertFrom-Json

$theme = @{}
foreach ($property in $jsonObj.PSObject.Properties) {
    $theme[$property.Name] = $property.Value
}

#Add theme to tenant
Add-SPOTheme -Name $ThemeName -Palette $theme -IsInverted $false -ErrorAction Stop

#Fetch the newly added theme to check if it is added successfully or not
$getTheme = Get-SPOTheme -Name $ThemeName


if($getTheme -ne $null)
{
    #Theme added successfully
    write-host "Theme created successfully."
} 
else
{
    #Theme not added successfully.
    write-host "Theme is not created successfully. Please check the parameters and try again"
}

References:
SharePoint site theming: PowerShell cmdlets
Get-SPOTheme
Add-SPOTheme

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