JyskIT.Automation

0.2.6

Public/TenantConnection/Connect-CustomerExchange.ps1

function Connect-CustomerExchange {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory)]
        [string]$CustomerTenantId,
        [Parameter()]
        [bool]$Retry
    )
    # Get SAM tokens if not already available
    begin {
        if (!$SAMTokens) {
            $SAMTokens = Get-SAMTokens
        }  
    }
    
    # Generate a token for MS graph, and connect with it.
    process {
        try {
            $exchangeToken = New-CustomPartnerAccessToken -Scopes 'https://outlook.office365.com/.default' -TenantId $CustomerTenantId
        }
        catch {
            throw "Failed to generate a token for Exchange Online: $_"
        }
        if($exchangeToken) {
            try {
                # Try to re-use existing connections
                $ConnectionInformation = Get-ConnectionInformation -ErrorAction SilentlyContinue
                if($ConnectionInformation.DelegatedOrganization -eq $CustomerTenantId){
                    return
                }
                Disconnect-ExchangeOnline -Confirm:$false -ErrorAction SilentlyContinue
            } catch {
                throw "Failed to disconnect from Exchange Online: $_"
            }

            try {
                Connect-ExchangeOnline -DelegatedOrganization $CustomerTenantId -AccessToken $exchangeToken -ShowBanner:$false
            }
            catch {
                if($Retry -eq $true) {
                    throw "Failed to connect to Exchange Online: $_"
                    return
                }
                Write-Host "Failed to connect to Exchange Online - perhaps they have not consented to our application correctly? Trying.." -ForegroundColor Yellow
                Set-SAMConsent -CustomerTenantId $CustomerTenantId
                Connect-CustomerExchange -CustomerTenantId $CustomerTenantId -Retry:$true
            }
        }
    }
}