Version 0.0.1

Classes/MailPostProcessor.php

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+<?php
+namespace Taywa\Ccemailfield;
+
+class MailPostProcessor extends \TYPO3\CMS\Form\PostProcess\MailPostProcessor
+{
+
+    /**
+     * Adds the carbon copy receiver of the mail message when configured
+     *
+     * Checks the address if it is a valid email address
+     *
+     * @return void
+     */
+    protected function setCc()
+    {
+        if (isset($this->typoScript['ccEmail'])) {
+            $emails = $this->formUtility->renderItem(
+                $this->typoScript['ccEmail.'],
+                $this->typoScript['ccEmail']
+            );
+        } elseif ($this->getTypoScriptValueFromIncomingData('ccEmailField') !== null) {
+            $emails = $this->getTypoScriptValueFromIncomingData('ccEmailField');
+        }
+        // die($emails);
+        $validEmails = $this->filterValidEmails($emails);
+        if (!empty($validEmails)) {
+            $this->mailMessage->setCc($validEmails);
+        }
+    }
+}

Documentation/README.rst

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+======================================
+Add ccEmailField to postProcessor of the sysext Form (TYPO3 V 7 LTS)
+======================================
+
+What does it do?
+========================
+
+This extension takes the content a field and uses this content (an e-mail address) when sending the form as CC address.
+
+To do this MailPostProcessor.php of form is extended, see here: https://github.com/TYPO3-CMS/form/blob/master/Classes/PostProcess/MailPostProcessor.php
+
+German:
+
+Diese Erweiterung nimmt den Inhalt ein Feldes und nutz diesen Inhalt (eine E-Mail Adresse) beim Versenden des Formulars als CC Adresse. Damit erhält der Absender des Formulars eine Kopie.
+
+
+
+Example of a Configuration as Form Content
+============================================
+
+
+method = post
+prefix = tx_form
+confirmation = 0
+postProcessor {
+    1 = mail
+    1 {
+        ccEmailField = email
+        recipientEmail = noise@taywa.ch
+        senderEmail = noise@taywa.ch
+        subject = Test of ccEmailField
+        messages {
+            success = TEXT
+            success {
+                value = <p>See you</p>
+            }
+        }
+    }
+}
+10 {
+    type = email
+    name = email
+    placeholder = Email
+    required = required
+    label {
+        value = Email
+    }
+}
+20 = SUBMIT
+20 {
+    type = submit
+    name = submit
+    value = Submit
+}
+
+
+Link to Extension Repository
+========================
+https://typo3.org/extensions/repository/view/taywa_ccemailfield
+
+========================
+This is the extended class:
+https://github.com/TYPO3-CMS/form/blob/master/Classes/PostProcess/MailPostProcessor.php
+
+Discussions around this:
+
+- https://stackoverflow.com/questions/29074323/typo3-tx-form-copy-to-sender-recipient-copy
+- https://forge.typo3.org/issues/32950
+- https://forge.typo3.org/issues/68771
+
+
+Typo3 specific:
+
+- https://docs.typo3.org/typo3cms/CoreApiReference/ApiOverview/Xclasses/Index.html
+- https://somethingphp.com/extending-classes-typo3/
+- http://insight.helhum.io/post/130876393595/how-to-configure-class-loading-for-extensions-in
+
+
+
+Tested in TYPO3 7 LTS only
+========================
+I tested this in TYPO3 7 LTS, not in TYPO3 8
+
+History
+========================
+v 0.0.1: initial version
+
+Licence
+========================
+Public Domain
+
+Author
+========================
+Fabian Thommen, ft@taywa.ch, taywa gmbh, Zürich, 2016
+
+Tools
+================================================
+
+zip this extension for upload to extension repro on typo3.org
+
+    zip -r ../taywa_ccemailfield_0.0.1.zip *

README.md

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+Documentation/README.rst

ext_emconf.php

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+<?php
+$EM_CONF[$_EXTKEY] = array(
+	'title' => 'Add ccEmailField to postProcessor of the sysext Form',
+	'description' => 'This extension takes the content a field and uses this content (an e-mail address) when sending the form as CC address',
+	'category' => 'plugin',
+	'state' => 'stable',
+	'author' => 'Fabian Thommen',
+	'author_email' => 'ft@taywa.ch',
+	'author_company' => 'taywa gmbh, Zürich',
+	'clearCacheOnLoad' => 0,
+	'version' => '0.0.1',
+	'constraints' => array(
+		'depends' => array(
+			'typo3' => '7.6.0-8.99.99',
+			'form'  => '7.6.0-0.0.0',
+		),
+		'conflicts' => array(),
+		'suggests' => array(),
+	),
+);

ext_localconf.php

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+<?php
+if (!defined('TYPO3_MODE')) {
+    die ('Access denied.');
+}
+
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][TYPO3\CMS\Form\PostProcess\MailPostProcessor::class] = [
+    'className' => Taywa\Ccemailfield\MailPostProcessor::class,
+];