OutlookAPI.ps1

# Outlook REST Api functions

function Send-OutlookMessage
<#
    .SYNOPSIS
    Sends mail message using Outlook REST API

    .DESCRIPTION
    Sends mail using Outlook REST API using the account of given credentials. 
    Message MUST be html (or plaintext).

    
    .Example
    PS C:\>$At=Get-AADIntAccessTokenForEXO
    PS C:\>Send-AADIntOutlookMessage -AccessToken $At -Recipient someone@company.com -Subject "An email" -Message "This is a message!"
   
#>
{
    Param(
        [Parameter(Mandatory=$False)]
        [String]$AccessToken,
        [Parameter(Mandatory=$True)]
        [String]$Recipient,
        [Parameter(Mandatory=$True)]
        [String]$Subject,
        [Parameter(Mandatory=$True)]
        [String]$Message,
        [Parameter(Mandatory=$False)]
        [Switch]$SaveToSentItems
    )

    Process
    {
        # Get from cache if not provided
        $AccessToken = Get-AccessTokenFromCache -AccessToken $AccessToken -Resource "https://outlook.office365.com" -ClientId "d3590ed6-52b3-4102-aeff-aad2292ab01c"
    
        $Request=@"
        {
          "Message": {
            "Subject": $(Escape-StringToJson $Subject),
            "Body": {
                "ContentType": "HTML",
                "Content": $(Escape-StringToJson $Message)
            },
            "ToRecipients": [
              {
                "EmailAddress": {
                  "Address": "$Recipient"
                }
              }
            ]
          },
          "SaveToSentItems": "$(if($SaveToSentItems){"true"}else{"false"})"
        }
"@

        $Cmd="me/sendmail"

        # Convert to UTF-8 bytes
        $Request_bytes = [system.Text.Encoding]::UTF8.getBytes($Request)

        Call-OutlookAPI -AccessToken $AccessToken -Command $Cmd -Method Post -Request $Request_bytes
    }
}

# Returns Outlook activities, a.k.a. the secrect forensics api
# MS has blocked the API but here it is anyways
# Apr 10th 2019
function Get-OutlookActivities
{
    Param(
        [Parameter(Mandatory=$False)]
        [String]$AccessToken
    )
    Process
    {
        # Get from cache if not provided
        $AccessToken = Get-AccessTokenFromCache -AccessToken $AccessToken -Resource "https://outlook.office365.com" -ClientId "d3590ed6-52b3-4102-aeff-aad2292ab01c"

        $Cmd="me/Activities"
        Call-OutlookAPI -AccessToken $AccessToken -Command $Cmd -Method Get -Api v1.0
    }
}


# Opens OWA as the given user
# Sep 1st 2021
function Open-OWA
{
<#
    .SYNOPSIS
    Opens OWA in a browser control window

    .DESCRIPTION
    Opens OWA in a browser control window as the given user

    .Example
    PS C:\>Get-AADIntAccessTokenForEXO -Resource "https://outlook.office.com" -SaveToCache
    PS C:\>Open-AADIntOWA

    .Example
    PS C:\>Get-AADIntAccessTokenForEXO -Resource "https://substrate.office.com" -SaveToCache
    PS C:\>Open-AADIntOWA -Mode Substrate
#>
    [cmdletbinding()]
    Param(
        [Parameter(Mandatory=$False)]
        [String]$AccessToken,
        [Parameter(Mandatory=$False)]
        [ValidateSet("Outlook","Substrate")]
        [String]$Mode="Outlook"
    )
    Begin
    {
        $icon = Convert-B64ToByteArray -B64 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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA//////////////////AH///gAf//gAD//wAAf/4AAD/+AAAf/AAAH/wAAA/8AAAP+AAAD/gAAA/4AAAP+AAAD/wAAA/8AAAP/AAAH/wAAA/8AAAP+AAAD/gAAA/4AAAP+PAHz/////////////////////////////////////8="
    }
    Process
    {
        $Mode = $Mode.ToLower()
        # Get from cache if not provided
        $AccessToken = Get-AccessTokenFromCache -AccessToken $AccessToken -Resource "https://$($Mode).office.com" -ClientId "d3590ed6-52b3-4102-aeff-aad2292ab01c"

        # Create the form and add a WebBrowser control to it
        [Windows.Forms.Form]$form = New-Object Windows.Forms.Form
        $form.Width = 1024
        $form.Height = 768
        $form.FormBorderStyle=[System.Windows.Forms.FormBorderStyle]::Sizable
        $form.Icon = [System.Drawing.Icon]::new([System.IO.MemoryStream]::new($icon))
        $form.Text = "AADInternals | $($mode).office.com"
        
        [Windows.Forms.WebBrowser]$web = New-Object Windows.Forms.WebBrowser
        $web.Size = $form.ClientSize
        $web.Anchor = "Left,Top,Right,Bottom"

        $form.Controls.Add($web)

        # Clear WebBrowser control cache
        Clear-WebBrowser

        $web.ScriptErrorsSuppressed = $True
        $web.Navigate("https://outlook.office.com/owa/","",$null,"Authorization: Bearer $AccessToken")

        $form.ShowDialog()

        $web.Dispose()
        $form.Dispose()
    }
}