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<?php
/*
* File: Structure.php
* Category: -
* Author: M.Goldenbaum
* Created: 17.09.20 20:38
* Updated: -
*
* Description:
* -
*/
namespace Webklex\PHPIMAP;
use Webklex\PHPIMAP\Exceptions\InvalidMessageDateException;
use Webklex\PHPIMAP\Exceptions\MessageContentFetchingException;
/**
* Class Structure
*
* @package Webklex\PHPIMAP
*/
class Structure {
/**
* Raw structure
*
* @var string $raw
*/
public string $raw = "";
/**
* @var Header $header
*/
private Header $header;
/**
* Message type (if multipart or not)
*
* @var int $type
*/
public int $type = IMAP::MESSAGE_TYPE_TEXT;
/**
* All available parts
*
* @var Part[] $parts
*/
public array $parts = [];
/**
* Config holder
*
* @var array $config
*/
protected array $config = [];
/**
* Structure constructor.
* @param $raw_structure
* @param Header $header
*
* @throws MessageContentFetchingException
* @throws InvalidMessageDateException
*/
public function __construct($raw_structure, Header $header) {
$this->raw = $raw_structure;
$this->header = $header;
$this->config = ClientManager::get('options');
$this->parse();
}
/**
* Parse the given raw structure
*
* @throws MessageContentFetchingException
* @throws InvalidMessageDateException
*/
protected function parse(): void {
$this->findContentType();
$this->parts = $this->find_parts();
}
/**
* Determine the message content type
*/
public function findContentType(): void {
$content_type = $this->header->get("content_type")->first();
if($content_type && stripos($content_type, 'multipart') === 0) {
$this->type = IMAP::MESSAGE_TYPE_MULTIPART;
}else{
$this->type = IMAP::MESSAGE_TYPE_TEXT;
}
}
/**
* Find all available headers and return the leftover body segment
* @var string $context
* @var integer $part_number
*
* @return Part[]
* @throws InvalidMessageDateException
*/
private function parsePart(string $context, int $part_number = 0): array {
$body = $context;
while (($pos = strpos($body, "\r\n")) > 0) {
$body = substr($body, $pos + 2);
}
$headers = substr($context, 0, strlen($body) * -1);
$body = substr($body, 0, -2);
$headers = new Header($headers);
if (($boundary = $headers->getBoundary()) !== null) {
return $this->detectParts($boundary, $body, $part_number);
}
return [new Part($body, $headers, $part_number)];
}
/**
* @param string $boundary
* @param string $context
* @param int $part_number
*
* @return array
* @throws InvalidMessageDateException
*/
private function detectParts(string $boundary, string $context, int $part_number = 0): array {
$base_parts = explode( $boundary, $context);
$final_parts = [];
foreach($base_parts as $ctx) {
$ctx = substr($ctx, 2);
if ($ctx !== "--" && $ctx != "" && $ctx != "\r\n") {
$parts = $this->parsePart($ctx, $part_number);
foreach ($parts as $part) {
$final_parts[] = $part;
$part_number = $part->part_number;
}
$part_number++;
}
}
return $final_parts;
}
/**
* Find all available parts
*
* @return array
* @throws MessageContentFetchingException
* @throws InvalidMessageDateException
*/
public function find_parts(): array {
if($this->type === IMAP::MESSAGE_TYPE_MULTIPART) {
if (($boundary = $this->header->getBoundary()) === null) {
throw new MessageContentFetchingException("no content found", 0);
}
return $this->detectParts($boundary, $this->raw);
}
return [new Part($this->raw, $this->header)];
}
}
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