settermjd/PartsFilterIterator.php

## mail_with_pdf_attachment.eml
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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sendgrid.com; s=ga1; h=mime-version:from:date:message-id:subject:to; bh=UYWCIUKTVXyV9U41l+c9+qOlpoeQGcJkKpyOAatNr3Y=; b=c1I/LcqHEJklmAThWr9Z8NKlTPHUlE/8sDSpK382fJtIQcGdUtczG0pijnUHegrFVt FDr4NehtJDD9KFvXLXboLCtObsu5HTN99ckUCCZTibZseA+J8U3jjCqTdj1fmUage5C7 //Iwi0Ndioonzhm18J7KStap66yZ69ED7UxPk=
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MIME-Version: 1.0
Received: by 10.107.48.17 with HTTP; Tue, 19 Jul 2016 08:06:21 -0700 (PDT)
From: Sender Name <example@example.com>
Date: Tue, 19 Jul 2016 09:06:21 -0600
Message-ID: <CAN_P_JNa25--hzm5=-ES9cnxgWa+h+E49OOAS7sPpV0gsoXCOw@mail.gmail.com>
Subject: Hello
To: example@example.comom
Content-Type: multipart/mixed; boundary=001a11447dc881e40f0537fe6d5a

--001a11447dc881e40f0537fe6d5a
Content-Type: multipart/alternative; boundary=001a11447dc881e40b0537fe6d58

--001a11447dc881e40b0537fe6d58
Content-Type: text/plain; charset=UTF-8

This is a test email with 1 attachment.

--001a11447dc881e40b0537fe6d58
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">This is a test email with 1 attachment.<br clear=3D"all"><=
div><br></div>-- <br><div class=3D"gmail_signature" data-smartmail=3D"gmail=
_signature"><div dir=3D"ltr"><img src=3D"https://sendgrid.com/brand/sg-logo=
-email.png" width=3D"96" height=3D"17"><br><div><br></div></div></div>
</div>

--001a11447dc881e40b0537fe6d58--

--001a11447dc881e40f0537fe6d5a
Content-Disposition: inline;
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Content-Type: application/pdf;
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--001a11447dc881e40f0537fe6d5a--

## PartsFilterIterator.php
<?php

declare(strict_types=1);

namespace App\Iterator;

use Laminas\Mime\Part;

class PartsFilterIterator extends \RecursiveFilterIterator
{
    public function accept(): bool
    {
        /** @var Part $part */
        $part = parent::current();

        return $this->hasChildren() ||
            (str_starts_with($part->getType(), "text/plain")
            || str_starts_with($part->getType(), "text/html"))
        ;
    }

    public function hasChildren(): bool
    {
        return $this->getInnerIterator()->hasChildren();
    }

    public function getChildren(): PartsFilterIterator
    {
        return new self($this->getInnerIterator()->getChildren());
    }
}

## PartsFilterIteratorTest.php
<?php

declare(strict_types=1);

namespace AppTest\Iterator;

use App\Iterator\PartsFilterIterator;
use App\Iterator\PartsIterator;
use Laminas\Mail\Message;
use Laminas\Mime\Part;
use PHPUnit\Framework\TestCase;
use RecursiveArrayIterator;

class PartsFilterIteratorTest extends TestCase
{
    public function testIteratesSuccessfullyOverPartsData()
    {
        $email = file_get_contents(
            __DIR__ . '/../../_files/mail_with_pdf_attachment.eml'
        );
        $message = Message::fromString($email);

        /** @var Part[] $iterator */
        $iterator = new \RecursiveIteratorIterator(
            new PartsFilterIterator(
                new PartsIterator(
                    $message->getBody()->getParts()
                ),
            ),
            \RecursiveIteratorIterator::SELF_FIRST
        );

        foreach ($iterator as $key => $value) {
            echo $value->getType();
        }

        $this->assertCount(2, $iterator);
    }
}

## PartsIterator.php
<?php

declare(strict_types=1);

namespace App\Iterator;

use Laminas\Mime\Part;

class PartsIterator extends \RecursiveArrayIterator
{
    public function hasChildren(): bool
    {
        /** @var Part $part */
        $part = $this->current();
        return ! empty($part->getParts());
    }

    public function getChildren(): \RecursiveArrayIterator
    {
        /** @var Part $current */
        $current = $this->current();
        return new PartsIterator($current->getParts());
    }
}
	Received: by mx0032p1mdw1.sendgrid.net with SMTP id rOkt2xLLKV Tue, 19 Jul 2016 15:06:29 +0000 (UTC)
	Received: from mail-it0-f45.google.com (mail-it0-f45.google.com [209.85.214.45]) by mx0032p1mdw1.sendgrid.net (Postfix) with ESMTPS id 26D6080397 for <parse@parse.yourdomain>; Tue, 19 Jul 2016 15:06:22 +0000 (UTC)
	Received: by mail-it0-f45.google.com with SMTP id f6so93587860ith.1 for <example@example.comom>; Tue, 19 Jul 2016 08:06:22 -0700 (PDT)
	DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sendgrid.com; s=ga1; h=mime-version:from:date:message-id:subject:to; bh=UYWCIUKTVXyV9U41l+c9+qOlpoeQGcJkKpyOAatNr3Y=; b=c1I/LcqHEJklmAThWr9Z8NKlTPHUlE/8sDSpK382fJtIQcGdUtczG0pijnUHegrFVt FDr4NehtJDD9KFvXLXboLCtObsu5HTN99ckUCCZTibZseA+J8U3jjCqTdj1fmUage5C7 //Iwi0Ndioonzhm18J7KStap66yZ69ED7UxPk=
	X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=UYWCIUKTVXyV9U41l+c9+qOlpoeQGcJkKpyOAatNr3Y=; b=lgmLXnmmpNcQMckjshsZsa2/8OjFZzntWYSG5XZo0fi32KHLuBLSHuNDFXn0V4ICp1 1xuT2fZCyhBSgNBiWNbjqFspdemzrBjaI1Tgm/Zz8Fv6wW2XdjpoANNQzJxfdhnecPd5 HvZ5P8+KTqjr4tAa9RmLthDc3UqhV9NRnCnhbW/AZaVQLB8eoJus92tD1GeXpBQml5XF m6vPUGrWGZWNugINkRKxIpk+2uECglAjNm4NpZIi9j7N94CxA18RC4NJ59WIsSybtIer hbCgT1Q13rvGEzvnp6FfFQVbE3DOibNqd0bh/EvZCagFVbnenNc/Q+qHtU9KqFlisSOp xh0w==
	X-Gm-Message-State: ALyK8tINVaZIP8YCgQbpg5ya8EnqQo76uxkXUPpDnM+kAyAQQzehFU10EgyuAe2fAmWf/muBiFDy0JDU74Eclp1/
	X-Received: by 10.36.76.16 with SMTP id a16mr4479786itb.77.1468940781988; Tue, 19 Jul 2016 08:06:21 -0700 (PDT)
	MIME-Version: 1.0
	Received: by 10.107.48.17 with HTTP; Tue, 19 Jul 2016 08:06:21 -0700 (PDT)
	From: Sender Name <example@example.com>
	Date: Tue, 19 Jul 2016 09:06:21 -0600
	Message-ID: <CAN_P_JNa25--hzm5=-ES9cnxgWa+h+E49OOAS7sPpV0gsoXCOw@mail.gmail.com>
	Subject: Hello
	To: example@example.comom
	Content-Type: multipart/mixed; boundary=001a11447dc881e40f0537fe6d5a

	--001a11447dc881e40f0537fe6d5a
	Content-Type: multipart/alternative; boundary=001a11447dc881e40b0537fe6d58

	--001a11447dc881e40b0537fe6d58
	Content-Type: text/plain; charset=UTF-8

	This is a test email with 1 attachment.

	--001a11447dc881e40b0537fe6d58
	Content-Type: text/html; charset=UTF-8
	Content-Transfer-Encoding: quoted-printable

	<div dir=3D"ltr">This is a test email with 1 attachment.<br clear=3D"all"><=
	div><br></div>-- <br><div class=3D"gmail_signature" data-smartmail=3D"gmail=
	_signature"><div dir=3D"ltr"><img src=3D"https://sendgrid.com/brand/sg-logo=
	-email.png" width=3D"96" height=3D"17"><br><div><br></div></div></div>
	</div>

	--001a11447dc881e40b0537fe6d58--

	--001a11447dc881e40f0537fe6d5a
	Content-Disposition: inline;
	filename="test document.pdf"
	Content-Type: application/pdf;
	x-mac-hide-extension=yes;
	x-unix-mode=0644;
	name="test document.pdf"
	Content-Transfer-Encoding: base64

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	--001a11447dc881e40f0537fe6d5a--
	<?php

	declare(strict_types=1);

	namespace App\Iterator;

	use Laminas\Mime\Part;

	class PartsFilterIterator extends \RecursiveFilterIterator
	{
	public function accept(): bool
	{
	/** @var Part $part */
	$part = parent::current();

	return $this->hasChildren() \|\|
	(str_starts_with($part->getType(), "text/plain")
	\|\| str_starts_with($part->getType(), "text/html"))
	;
	}

	public function hasChildren(): bool
	{
	return $this->getInnerIterator()->hasChildren();
	}

	public function getChildren(): PartsFilterIterator
	{
	return new self($this->getInnerIterator()->getChildren());
	}
	}
	<?php

	declare(strict_types=1);

	namespace AppTest\Iterator;

	use App\Iterator\PartsFilterIterator;
	use App\Iterator\PartsIterator;
	use Laminas\Mail\Message;
	use Laminas\Mime\Part;
	use PHPUnit\Framework\TestCase;
	use RecursiveArrayIterator;

	class PartsFilterIteratorTest extends TestCase
	{
	public function testIteratesSuccessfullyOverPartsData()
	{
	$email = file_get_contents(
	__DIR__ . '/../../_files/mail_with_pdf_attachment.eml'
	);
	$message = Message::fromString($email);

	/** @var Part[] $iterator */
	$iterator = new \RecursiveIteratorIterator(
	new PartsFilterIterator(
	new PartsIterator(
	$message->getBody()->getParts()
	),
	),
	\RecursiveIteratorIterator::SELF_FIRST
	);

	foreach ($iterator as $key => $value) {
	echo $value->getType();
	}

	$this->assertCount(2, $iterator);
	}
	}