SGMailer.psm1
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function ConvertTo-SGEncryptedToken { <# .Synopsis Encrypts token with machine key for later use. .Description Encrypts token with machine key for later use. .Parameter Token Token to be encrypted. .Example ConvertTo-SGEncryptedToken -Token "SG.asdfASDF1234....." #> param( [Parameter(Mandatory,ValueFromPipeline)][String]$Token ) Add-Type -AssemblyName System.Security return [System.Convert]::ToBase64String([Security.Cryptography.ProtectedData]::Protect([System.Text.Encoding]::Unicode.GetBytes($Token), $null, [Security.Cryptography.DataProtectionScope]::LocalMachine)) } function ConvertFrom-SGEncryptedToken { <# .Synopsis Decrypts token with machine key. .Description Decrypts token with machine key. .Parameter Token Token to be decrypted. .Example ConvertFrom-SGEncryptedToken -Token "SG.asdfASDF1234....." #> param( [Parameter(Mandatory,ValueFromPipeline)][String]$Token ) Add-Type -AssemblyName System.Security return [System.Text.Encoding]::Unicode.GetString([Security.Cryptography.ProtectedData]::Unprotect([System.Convert]::FromBase64String($Token), $null, [Security.Cryptography.DataProtectionScope]::LocalMachine)) } function New-SGToken{ <# .Synopsis Gets the SendGridToken via SendGrid REST API v3. .Description Gets the SendGridToken via SendGrid REST API v3. .Parameter AdminToken SendGrid token with at least api_keys.create, api_keys.delete, api_keys.read, api_keys.update, mail.send privilege. .Parameter APIKeyName SendGrid API key name. Give a recognizable name to the API key. Defaults to $env:COMPUTERNAME .Example New-SGToken -AdminToken "SG.asdfASDF1234....." .Example New-SGToken -APIKeyName "Johns PC" -AdminToken "SG.asdfASDF1234....." #> param( [Parameter(Mandatory,ValueFromPipeline)][String]$AdminToken, [String]$APIKeyName=$env:COMPUTERNAME ) ## Adding REST parameters $Parameters=@{ Method="POST" Uri="https://api.sendgrid.com/v3/api_keys" Headers=@{"authorization"="Bearer $AdminToken"} ContentType="application/json" Body=(@{ "name" = $APIKeyName "scopes" = @("mail.send") }|ConvertTo-Json) } ## Sending REST request $ApiKey = (Invoke-RestMethod @Parameters).api_key return $ApiKey } function Install-SGToken{ <# .Synopsis Sets the SendGridToken environment variable. After usage, please restart PS session. .Description Sets the Token parameter as encrypted to the SendGridToken environment variable. After usage, please restart PS session. .Parameter Token SendGrid token. Should be able to have at least "send email" privilege. .Example Install-SGToken -Token "SG.asdfASFD1234....." #> param( [Parameter(Mandatory,ValueFromPipeline)][String]$Token ) ##Determining active process elevation if(!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")){ Write-Host "`r`n Opening new elevated pwsh window to set environment variable machine-wide.`r`n Press any key to continue...`r`n" -ForegroundColor Yellow $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown") |out-null ##Scriptblock for converting Token to SecureString and setting as SendGridToken environment variable $SetENVVar = [Scriptblock]::Create("[System.Environment]::SetEnvironmentVariable('SendGridToken',(ConvertTo-SGEncryptedToken -Token $Token),'Machine')") ##Starting elevated process and executing the scriptblock Start-Process powershell.exe -Verb RunAs -ArgumentList "-command $SetENVVar" } else{ ##Converting Token to SecureString and setting as SendGridToken environment variable [System.Environment]::SetEnvironmentVariable('SendGridToken',(ConvertTo-SGEncryptedToken -Token $Token),'Machine') } } function Send-SGMail{ <# .Synopsis Sends an email via SendGrid REST API v3. .Description Sends an email via SendGrid REST API v3. .Parameter From Sender email address. .Parameter To Recipient email address. .Parameter Subject Subject of the email. .Parameter NoHTML If set, email body will be sent as plaint text, not HTML. .Parameter SendGridToken Direct input of the SendGrid REST API v3 token. Default: use encrypted token from $env:SendGridToken (which can be installed using Install-SGToken) .Parameter Body Email body as string. .Example # Send an HTML email Send-SGMail -From john.doe@example.com -To jane.doe@example.com -Subject "Confession" -Body "<p><b>LOVE</b> <i>you!</i></p>" .Example # Send a plain text email Send-SGMail -From jane.doe@example.com -To john.doe@example.com -Subject "Re: Confession" -Body "Love you too!" -NoHTML #> param( [Parameter(Mandatory)][String]$From, [Parameter(Mandatory)][String]$To, [Parameter(Mandatory)][String]$Subject, [switch]$NoHTML, [string]$SendGridToken, [Parameter(Mandatory,ValueFromPipeline)][String]$Body ) ## Setting content-type if(!$NoHTML){$Type="text/HTML"}else{$Type="text/plain"} ## Getting SendGridToken if(!$SendGridToken){ if("SendGridToken" -in (Get-Item 'Registry::HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\' |select -ExpandProperty property)){ $SendGridToken = ConvertFrom-SGEncryptedToken -Token (Get-ItemProperty 'Registry::HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment' -Name SendGridToken).SendGridToken } else{throw "SendGridToken missing. Give it directly using the -SendGridToken parameter or install it using the Install-SGToken command."} } ## Building data for JSON $SendGridBody = [pscustomObject]@{ "personalizations"= @( @{"to"=@(@{"email"=$To}) "subject"=$Subject}) "content"=@(@{ "type"=$Type "charset"="UTF-8" "value"=$Body}) "from"= @{"email"=$From} } ## Adding REST parameters $Parameters=@{ Method="POST" Uri="https://api.sendgrid.com/v3/mail/send" Headers=@{"authorization"="Bearer $SendGridToken"} ContentType="application/json" Body=($SendGridBody|ConvertTo-Json -Depth 4) } ## Sending REST request Invoke-RestMethod @Parameters } Export-ModuleMember -Function Send-SGMail,Install-SGToken,New-SGToken,ConvertTo-SGEncryptedToken,ConvertFrom-SGEncryptedToken |