invoiceninja/app/Services/TemplateService.php

<?php namespace App\Services;

use Form;
use HTML;
use Utils;
use App\Models\Gateway;

class TemplateService
{
    public function processVariables($template, $data)
    {
        $account = $data['account'];
        $client = $data['client'];
        $invitation = $data['invitation'];
        $invoice = $invitation->invoice;
        $passwordHTML = isset($data['password'])?'<p>'.trans('texts.password').': '.$data['password'].'<p>':false;
        $documentsHTML = '';

        if ($account->hasFeature(FEATURE_DOCUMENTS) && $invoice->hasDocuments()) {
            $documentsHTML .= trans('texts.email_documents_header').'<ul>';
            foreach($invoice->documents as $document){
                $documentsHTML .= '<li><a href="'.HTML::entities($document->getClientUrl($invitation)).'">'.HTML::entities($document->name).'</a></li>';
            }
            foreach($invoice->expenses as $expense){
                foreach($expense->documents as $document){
                    $documentsHTML .= '<li><a href="'.HTML::entities($document->getClientUrl($invitation)).'">'.HTML::entities($document->name).'</a></li>';
                }
            }
            $documentsHTML .= '</ul>';
        }

        $variables = [
            '$footer' => $account->getEmailFooter(),
            '$client' => $client->getDisplayName(),
            '$account' => $account->getDisplayName(),
            '$dueDate' => $account->formatDate($invoice->due_date),
            '$invoiceDate' => $account->formatDate($invoice->invoice_date),
            '$contact' => $invitation->contact->getDisplayName(),
            '$firstName' => $invitation->contact->first_name,
            '$amount' => $account->formatMoney($data['amount'], $client),
            '$invoice' => $invoice->invoice_number,
            '$quote' => $invoice->invoice_number,
            '$link' => $invitation->getLink(),
            '$password' => $passwordHTML,
            '$viewLink' => $invitation->getLink().'$password',
            '$viewButton' => Form::emailViewButton($invitation->getLink(), $invoice->getEntityType()).'$password',
            '$paymentLink' => $invitation->getLink('payment').'$password',
            '$paymentButton' => Form::emailPaymentButton($invitation->getLink('payment')).'$password',
            '$customClient1' => $account->custom_client_label1,
            '$customClient2' => $account->custom_client_label2,
            '$customInvoice1' => $account->custom_invoice_text_label1,
            '$customInvoice2' => $account->custom_invoice_text_label2,
            '$documents' => $documentsHTML,
            '$autoBill' => empty($data['autobill'])?'':$data['autobill'],
        ];

        // Add variables for available payment types
        foreach (Gateway::$gatewayTypes as $type) {
            $camelType = Utils::toCamelCase($type);
            $variables["\${$camelType}Link"] = $invitation->getLink('payment') . "/{$type}";
            $variables["\${$camelType}Button"] = Form::emailPaymentButton($invitation->getLink('payment')  . "/{$type}");
        }

        $includesPasswordPlaceholder = strpos($template, '$password') !== false;

        $str = str_replace(array_keys($variables), array_values($variables), $template);

        if (!$includesPasswordPlaceholder && $passwordHTML) {
            $pos = strrpos($str, '$password');
            if ($pos !== false)
            {
                $str = substr_replace($str, $passwordHTML, $pos, 9/* length of "$password" */);
            }
        }
        $str = str_replace('$password', '', $str);
        $str = autolink($str, 100);

        return $str;
    }
}