Private/Functions.ps1

. $PSScriptRoot\SetupTypes.ps1

function Test-SM365ConnectionStatus
{
    [CmdLetBinding()]
    Param
    (

    )

    [bool] $isConnected = $false

    if(!(Get-Module ExchangeOnlineManagement -ErrorAction SilentlyContinue))
    {
        Write-Warning "ExchangeOnlineManagement module not yet imported"
        Write-Warning "Importing ExchangeOnlineManagement module"
        $m = Import-Module ExchangeOnlineManagement -PassThru -ErrorAction SilentlyContinue

        if(!$m)
        {throw [System.Exception] "ExchangeOnlineManagement module does not seem to be installed"}
    }
    else
    {
        $isConnected = (Get-PSSession | ? { $_.Name -like "ExchangeOnlineInternalSession*" -and $_.State -eq "Opened" }).Count -gt 0
    }

    if(!$isConnected)
    {
        Write-Warning "You're not connected to your Exchange Online organization"

        if($InteractiveSession) # defined in public/Functions.ps1
        {
            try
            {
                # throws an exception if authentication fails
                Connect-ExchangeOnline
                $isConnected = $true
            }
            catch
            {}
        }
    }

    # Record the default domain, of the Exchange Online organization we're connected to
    if($isConnected -and !$Script:ExODefaultDomain)
    {
        [string] $Script:ExODefaultDomain = Get-AcceptedDomain | ?{$_.Default} | select -ExpandProperty DomainName -First 1
    }

    return $isConnected
}

# Generic function to avoid code duplication
function Set-SM365PropertiesFromConfigJson
{
    [CmdLetBinding()]
    Param
    (
        [psobject] $InputObject,
        [psobject] $Json,
        [SM365.ConfigVersion] $Version
    )

    # Set all properties that aren't version specific
    $json.psobject.properties | % {
        if ($_.Name -notin @("Version", "Name"))
        { $InputObject.$($_.Name) = $_.Value }
    }

    # Set the version specific properties, except if none has been requested
    if ($Version -ne [SM365.ConfigVersion]::None) {
        $json.Version.$Version.psobject.properties | % {
            $InputObject.$($_.Name) = $_.Value
        }
    }
}

# Essentially a factory function for either an empty
# settings object, filled with necessary attributes to identify
# the O365 object (i.e. the Name), or version specific settings.
function Get-SM365InboundConnectorSettings
{
    [CmdletBinding()]
    Param
    (
        [SM365.ConfigVersion] $Version = [SM365.ConfigVersion]::Default
    )

    if($Version -ne "None")
    {Write-Verbose "Loading inbound connector settings for version $Version"}
    else
    {Write-Verbose "Loading mandatory inbound connector settings"}

    $json = ConvertFrom-Json (Get-Content -Path "$PSScriptRoot\..\ExOConfig\Connectors\Inbound.json" -Raw)

    $ret = [SM365.InboundConnectorSettings]::new($json.Name, $Version)

    Set-SM365PropertiesFromConfigJson $ret -Json $json -Version $Version

    return $ret
}

function Get-SM365OutboundConnectorSettings
{
    [CmdletBinding()]
    Param
    (
        [SM365.ConfigVersion] $Version = [SM365.ConfigVersion]::Default
    )

    if($Version -ne "None")
    {Write-Verbose "Loading outbound connector settings for version $Version"}
    else
    {Write-Verbose "Loading mandatory outbound connector settings"}

    $json = ConvertFrom-Json (Get-Content -Path "$PSScriptRoot\..\ExOConfig\Connectors\Outbound.json" -Raw)

    $ret = [SM365.OutboundConnectorSettings]::new($json.Name, $Version)

    Set-SM365PropertiesFromConfigJson $ret -Json $json -Version $Version

    return $ret
}


function Get-SM365TransportRuleSettings
{
    [CmdLetBinding()]
    Param
    (
        [SM365.ConfigVersion] $Version = [SM365.ConfigVersion]::Default,
        [SM365.AvailableTransportRuleSettings[]] $Settings =[SM365.AvailableTransportRuleSettings]::All
    )

    if($Version -ne "None")
    {Write-Verbose "Loading transport rule settings for version $Version"}
    else
    {Write-Verbose "Loading mandatory transport rule settings"}

    $settingsToFetch = 0
    foreach($set in $Settings)
    {$settingsToFetch = $settingsToFetch -bor $set}


    $configs = array string
    $ret = array SM365.TransportRuleSettings -Capacity $configs.Count
    $addSetting = {
        Param
        (
            [string] $FileName,
            [SM365.AvailableTransportRuleSettings] $Type
        )
        $json = ConvertFrom-Json (Get-Content "$PSScriptRoot\..\ExOConfig\Rules\$FileName" -Raw)

        $settings = [SM365.TransportRuleSettings]::new($json.Name, $Version, $Type)

        Set-SM365PropertiesFromConfigJson $settings -Json $json -Version $Version

        $ret.Add($settings)
    }

    if([SM365.AvailableTransportRuleSettings]::OutgoingHeaderCleaning -band $settingsToFetch)
    {& $addSetting "X-SM-outgoing-header-cleaning.json" "OutgoingHeaderCleaning"}

    if([SM365.AvailableTransportRuleSettings]::DecryptedHeaderCleaning -band $settingsToFetch)
    {& $addSetting "X-SM-decrypted-header-cleaning.json" "DecryptedHeaderCleaning"}

    if([SM365.AvailableTransportRuleSettings]::EncryptedHeaderCleaning -band $settingsToFetch)
    {& $addSetting "X-SM-encrypted-header-cleaning.json" "EncryptedHeaderCleaning"}

    if([SM365.AvailableTransportRuleSettings]::SkipSpfIncoming -band $settingsToFetch)
    {& $addSetting "Skip-SPF-incoming.json" "SkipSpfIncoming"}

    if([SM365.AvailableTransportRuleSettings]::SkipSpfInternal -band $settingsToFetch)
    {& $addSetting "Skip-SPF-internal.json" "SkipSpfInternal"}

    if([SM365.AvailableTransportRuleSettings]::Inbound -band $settingsToFetch)
    {& $addSetting "Inbound.json" "Inbound"}

    if([SM365.AvailableTransportRuleSettings]::Outbound -band $settingsToFetch)
    {& $addSetting "Outbound.json" "Outbound"}

    # Deactivated, because it seems unnecessary
    # if([SM365.AvailableTransportRuleSettings]::Internal -band $settingsToFetch)
    # {& $addSetting "Internal.json" "Internal"}

    # Return the array in reverse SMPriority order, so that they can be created with the
    # same priority, i.e.:
    # New-TransportRule @param -Priority 3
    # But via this sorting, an SMPriority 0 rule will actually be at the top (but at priority 3).
    $ret | Sort-Object -Property SMPriority -Descending
}
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