DSCResources/MSFT_EXOAvailabilityConfig/MSFT_EXOAvailabilityConfig.psm1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $OrgWideAccount,

        [Parameter()]
        [ValidateSet('Present', 'Absent')]
        [System.String]
        $Ensure = 'Present',

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [Parameter()]
        [System.String]
        $ApplicationId,

        [Parameter()]
        [System.String]
        $TenantId,

        [Parameter()]
        [System.String]
        $CertificateThumbprint,

        [Parameter()]
        [System.String]
        $CertificatePath,

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $CertificatePassword,

        [Parameter()]
        [Switch]
        $ManagedIdentity,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )

    if ($Global:CurrentModeIsExport)
    {
        $ConnectionMode = New-M365DSCConnection -Workload 'ExchangeOnline' `
            -InboundParameters $PSBoundParameters `
            -SkipModuleReload $true
    }
    else
    {
        $ConnectionMode = New-M365DSCConnection -Workload 'ExchangeOnline' `
            -InboundParameters $PSBoundParameters
    }

    $ConnectionMode = New-M365DSCConnection -Workload 'MicrosoftGraph' `
        -InboundParameters $PSBoundParameters

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName -replace 'MSFT_', ''
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion
    Write-Verbose -Message "Getting configuration of Availability Config for $OrgWideAccount"

    $nullReturn = $PSBoundParameters
    $nullReturn.Ensure = 'Absent'

    try
    {
        $AvailabilityConfigs = Get-AvailabilityConfig -ErrorAction Stop

        if ($null -ne $AvailabilityConfigs -and $null -ne $AvailabilityConfigs.OrgWideAccount)
        {
            $user = Get-MgUser -UserId $OrgWideAccount -ErrorAction Stop
            $AvailabilityConfig = ($AvailabilityConfigs | Where-Object -FilterScript { $_.OrgWideAccount -IMatch $user.UserId })
        }
        if ($null -eq $AvailabilityConfig)
        {
            Write-Verbose -Message "Availability config for [$($OrgWideAccount)] does not exist."
            return $nullReturn
        }
        $result = @{
            OrgWideAccount        = $OrgWideAccount
            Ensure                = 'Present'
            Credential            = $Credential
            ApplicationId         = $ApplicationId
            CertificateThumbprint = $CertificateThumbprint
            CertificatePath       = $CertificatePath
            CertificatePassword   = $CertificatePassword
            Managedidentity       = $ManagedIdentity.IsPresent
            TenantId              = $TenantId
            AccessTokens          = $AccessTokens
        }

        Write-Verbose -Message "Found Availability Config for $($OrgWideAccount)"
        return $result
    }
    catch
    {
        New-M365DSCLogEntry -Message 'Error retrieving data:' `
            -Exception $_ `
            -Source $($MyInvocation.MyCommand.Source) `
            -TenantId $TenantId `
            -Credential $Credential

        return $nullReturn
    }
}

function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $OrgWideAccount,

        [Parameter()]
        [ValidateSet('Present', 'Absent')]
        [System.String]
        $Ensure = 'Present',

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [Parameter()]
        [System.String]
        $ApplicationId,

        [Parameter()]
        [System.String]
        $TenantId,

        [Parameter()]
        [System.String]
        $CertificateThumbprint,

        [Parameter()]
        [System.String]
        $CertificatePath,

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $CertificatePassword,

        [Parameter()]
        [Switch]
        $ManagedIdentity,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName -replace 'MSFT_', ''
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion
    Write-Verbose -Message "Setting configuration of Availability Config for account $OrgWideAccount"

    $currentAvailabilityConfig = Get-TargetResource @PSBoundParameters

    $ConnectionMode = New-M365DSCConnection -Workload 'ExchangeOnline' `
        -InboundParameters $PSBoundParameters

    # CASE: Availability Config doesn't exist but should;
    if ($Ensure -eq 'Present' -and $currentAvailabilityConfig.Ensure -eq 'Absent')
    {
        Write-Verbose -Message "Availability Config '$($OrgWideAccount)' does not exist but it should. Create it."
        New-AvailabilityConfig -OrgWideAccount $OrgWideAccount
    }
    # CASE: Availability Config exists but it shouldn't;
    elseif ($Ensure -eq 'Absent' -and $currentAvailabilityConfig.Ensure -eq 'Present')
    {
        Write-Verbose -Message "Availability Config '$($OrgWideAccount)' exists but it shouldn't. Remove it."
        Remove-AvailabilityConfig -Confirm:$false
    }
    # CASE: Availability Config exists and it should, but has different values than the desired ones
    elseif ($Ensure -eq 'Present' -and $currentAvailabilityConfig.Ensure -eq 'Present')
    {
        Write-Verbose -Message "Availability Config '$($OrgWideAccount)' already exists, but needs updating."
        Set-AvailabilityConfig -OrgWideAccount $OrgWideAccount -Confirm:$false
    }
}

function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $OrgWideAccount,

        [Parameter()]
        [ValidateSet('Present', 'Absent')]
        [System.String]
        $Ensure = 'Present',

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [Parameter()]
        [System.String]
        $ApplicationId,

        [Parameter()]
        [System.String]
        $TenantId,

        [Parameter()]
        [System.String]
        $CertificateThumbprint,

        [Parameter()]
        [System.String]
        $CertificatePath,

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $CertificatePassword,

        [Parameter()]
        [Switch]
        $ManagedIdentity,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )
    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName -replace 'MSFT_', ''
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Write-Verbose -Message "Testing configuration of Availability Config for account $OrgWideAccount"

    $CurrentValues = Get-TargetResource @PSBoundParameters

    Write-Verbose -Message "Current Values: $(Convert-M365DscHashtableToString -Hashtable $CurrentValues)"
    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $PSBoundParameters)"

    $ValuesToCheck = $PSBoundParameters

    $DesiredValues = $PSBoundParameters

    $TestResult = Test-M365DSCParameterState -CurrentValues $CurrentValues `
        -Source $($MyInvocation.MyCommand.Source) `
        -DesiredValues $DesiredValues `
        -ValuesToCheck $ValuesToCheck.Keys

    Write-Verbose -Message "Test-TargetResource returned $TestResult"

    return $TestResult
}

function Export-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.String])]
    param
    (
        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [Parameter()]
        [System.String]
        $ApplicationId,

        [Parameter()]
        [System.String]
        $TenantId,

        [Parameter()]
        [System.String]
        $CertificateThumbprint,

        [Parameter()]
        [System.String]
        $CertificatePath,

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $CertificatePassword,

        [Parameter()]
        [Switch]
        $ManagedIdentity,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )
    $ConnectionMode = New-M365DSCConnection -Workload 'ExchangeOnline' `
        -InboundParameters $PSBoundParameters `
        -SkipModuleReload $true

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName -replace 'MSFT_', ''
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    try
    {
        if ($null -ne $Global:M365DSCExportResourceInstancesCount)
        {
            $Global:M365DSCExportResourceInstancesCount++
        }

        if ($null -eq (Get-Command Get-AvailabilityConfig -ErrorAction SilentlyContinue))
        {
            Write-Host "`r`n $($Global:M365DSCEmojiRedX) The specified account doesn't have permissions to access Availibility Config"
            return ''
        }
        $AvailabilityConfig = Get-AvailabilityConfig -ErrorAction Stop

        if ($null -eq $AvailabilityConfig)
        {
            Write-Host $Global:M365DSCEmojiGreenCheckMark
            return ''
        }

        $OrgWideValue = "NotConfigured"
        if ($null -ne $AvailabilityConfig.OrgWideAccount)
        {
            $user = Get-User -Identity $AvailabilityConfig.OrgWideAccount.ToString()
            $OrgWideValue = $user.UserPrincipalName
        }
        $Params = @{
            OrgWideAccount        = $OrgWideValue
            Credential            = $Credential
            ApplicationId         = $ApplicationId
            TenantId              = $TenantId
            CertificateThumbprint = $CertificateThumbprint
            CertificatePassword   = $CertificatePassword
            Managedidentity       = $ManagedIdentity.IsPresent
            CertificatePath       = $CertificatePath
            AccessTokens          = $AccessTokens
        }
        $Results = Get-TargetResource @Params
        $Results = Update-M365DSCExportAuthenticationResults -ConnectionMode $ConnectionMode `
            -Results $Results
        $currentDSCBlock = Get-M365DSCExportContentForResource -ResourceName $ResourceName `
            -ConnectionMode $ConnectionMode `
            -ModulePath $PSScriptRoot `
            -Results $Results `
            -Credential $Credential
        $dscContent += $currentDSCBlock

        Save-M365DSCPartialExport -Content $currentDSCBlock `
            -FileName $Global:PartialExportFileName
        Write-Host $Global:M365DSCEmojiGreenCheckMark
        return $dscContent
    }
    catch
    {
        Write-Host $Global:M365DSCEmojiRedX

        New-M365DSCLogEntry -Message 'Error during Export:' `
            -Exception $_ `
            -Source $($MyInvocation.MyCommand.Source) `
            -TenantId $TenantId `
            -Credential $Credential

        return ''
    }
}

Export-ModuleMember -Function *-TargetResource