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IMAP access class to decode imap body, fetch and assemble all the parts and attachments. Used as an utility class for processing a whole mailbox.
<?php
/**
* IMAP_access. Utility class for processing a mailbox for applications that
* want to grab the body text and do something with it e.g. create a new
* todo list item. Enough clues in there that it can be expanded to do
* a lot more if required - e.g. also grab file attachments.
*
* Based on several part-working tutorials (fixed), the PHP manual examples
* and testing on real email samples from Gmail, Thunderbird and MS outlook 2010.
* (flatten_parts is the tricky bit and was from here:
* https://www.electrictoolbox.com/php-imap-message-parts/ this is a nifty implementation
* of an idea from the PHP manual user notes for imap_fetchstructure)
*
* Use like:
* $im = new IMAP_access();
* if(!$im->open(...parameters...)){
* //...failed
* }
* $overview = $im->get_overview();
* foreach($overview as $msg){
* //...loop through doing stuff
* $im->get_body($msg);
* //e.g. do something with $im->body_plain
* }
* $im->close();
*
*/
class IMAP_access {
protected $connection;
protected $message_number;
public $message_overview = [];
public $body_HTML = '';
public $body_HTML_charset = '';
public $body_plain = '';
public $body_plain_charset = '';
public $attachments = [];
public $get_attachments = false;
public function __construct() {
//...
}
public function open($server, $username, $password, $options = 0, $retries = 1){
$this->connection = @imap_open($server, $username, $password, $options, $retries);
return $this->connection !== false;
}
public function close($do_expunge = false){
if($do_expunge){
//delete any marked messages before closing
imap_expunge($this->connection);
}
imap_close($this->connection);
}
public function get_overview(){
$message_check = imap_check($this->connection);
$message_total = $message_check->Nmsgs;
$overview = imap_fetch_overview($this->connection, "1:$message_total", 0);
$size = count($overview);
for($i = $size - 1; $i >= 0; $i--){
$val = $overview[$i];
foreach($val as &$v){
$v = $this->mime_header_decode($v);
}
$this->message_overview[] = $val;
}
return $this->message_overview;
}
public function delete_message($msg_obj){
$this->message_number = $msg_obj->msgno;
//could collect these up and do 1 delete multiple
imap_delete($this->connection, $this->message_number);
}
public function get_body($msg_obj){
$this->body_HTML = '';
$this->body_HTML_charset = '';
$this->body_plain = '';
$this->body_plain_charset = '';
$this->attachments = [];
$this->message_number = $msg_obj->msgno;
$structure = @imap_fetchstructure($this->connection, $this->message_number);
//print_r($structure);
$flattened_parts = [];
if($structure === false){
return false;
}
if(isset($structure->parts)){
$flattened_parts = $this->flatten_parts($structure->parts);
}else{
$flattened_parts['1'] = $structure;
}
//echo var_dump($flattened_parts, true);
foreach($flattened_parts as $part_number => $part) {
//print_r($part);
switch($part->type){
case TYPETEXT:
//check for a plain text attachment
$disposition = (isset($part->disposition) ? strtolower($part->disposition) : '');
if($disposition == 'attachment'){
$filename = $this->get_filename_from_part($part);
if($filename) {
// it's an attachment
$this->attachments[] = [
'type' => $part->type,
'subtype' => $part->subtype,
'filename' => $filename,
'data' => $this->get_attachments ? $this->get_part($part_number, $part->encoding) : '',
'inline' => false,
'charset' => $this->get_charset_from_part($part),
'part' => $part_number //saved for deferred fetch
];
}
else {
// unknown - ignore
}
}else{
// the HTML or plain text part of the email
$message = $this->get_part($part_number, $part->encoding);
if(strtolower($part->subtype) == 'plain'){
//plain text
$this->body_plain .= $message;
$this->body_plain_charset = $this->get_charset_from_part($part);
}else{
//html
$this->body_HTML .= $message;
$this->body_HTML_charset = $this->get_charset_from_part($part);
}
}
break;
case TYPEMULTIPART:
// multi-part headers, can skip
break;
case TYPEMESSAGE:
// bounced message - just add this to plain text body
$this->body_plain .= $this->get_part($part_number, $part->encoding) . "\n";
break;
case TYPEAPPLICATION: // application
case TYPEAUDIO: // audio
case TYPEIMAGE: // image
case TYPEVIDEO: // video
case TYPEMODEL: // other
case TYPEOTHER: // other
default:
$filename = $this->get_filename_from_part($part);
if($filename) {
// it's an attachment - id holds the cid for embedded
if(isset($part->id)) {
$id = str_replace(array('<', '>'), '', $part->id);
$this->attachments[$id] = array(
'type' => $part->type,
'subtype' => $part->subtype,
'filename' => $filename,
'data' => $this->get_attachments ? $this->get_part($part_number, $part->encoding) : '',
'inline' => true,
'part' => $part_number //saved for deferred fetch
);
}else {
$this->attachments[] = array(
'type' => $part->type,
'subtype' => $part->subtype,
'filename' => $filename,
'data' => $this->get_attachments ? $this->get_part($part_number, $part->encoding) : '',
'inline' => false,
'part' => $part_number //saved for deferred fetch
);
}
} else {
// unknown- ignore
}
break;
}
}
//workround for open php iconv bug with //IGNORE
ini_set('mbstring.substitute_character', "none"); //space as subst, "none" to remove
if($this->body_plain != ''){
$this->body_plain = mb_convert_encoding($this->body_plain, 'UTF-8',
$this->body_plain_charset != '' ? $this->body_plain_charset : 'pass');
}
if($this->body_HTML != ''){
$this->body_HTML = mb_convert_encoding($this->body_HTML, 'UTF-8',
$this->body_HTML_charset != '' ? $this->body_HTML_charset : 'pass');
}
return true;
}
protected function flatten_parts($message_parts, $flattened_parts = [], $prefix = '', $index = 1, $full_prefix = true) {
//recursive flatten
foreach($message_parts as $part) {
$flattened_parts[$prefix . $index] = $part;
if(isset($part->parts)) {
if($part->type == 2) {
$flattened_parts = $this->flatten_parts($part->parts, $flattened_parts, $prefix . $index . '.', 0, false);
}elseif($full_prefix) {
$flattened_parts = $this->flatten_parts($part->parts, $flattened_parts, $prefix . $index . '.');
}else {
$flattened_parts = $this->flatten_parts($part->parts, $flattened_parts, $prefix);
}
unset($flattened_parts[$prefix . $index]->parts);
}
$index++;
}
return $flattened_parts;
}
protected function get_part($part_number, $encoding) {
//print_r($part_number);
$data = imap_fetchbody($this->connection, $this->message_number, $part_number);
switch($encoding) {
case ENC7BIT: return $data; // 7BIT
case ENC8BIT: return $data; // 8BIT
case ENCBINARY: return $data; // BINARY
case ENCBASE64: return base64_decode($data); // BASE64
case ENCQUOTEDPRINTABLE: return quoted_printable_decode($data); // QUOTED_PRINTABLE
case ENCOTHER:
default:
return $data; // OTHER
}
}
protected function get_filename_from_part($part) {
$filename = '';
if($part->ifdparameters) {
foreach($part->dparameters as $object) {
if(strtolower($object->attribute) == 'filename') {
$filename = $object->value;
}
}
}
if(!$filename && $part->ifparameters) {
foreach($part->parameters as $object) {
if(strtolower($object->attribute) == 'name') {
$filename = $object->value;
}
}
}
return $this->mime_header_decode($filename);
}
protected function get_charset_from_part($part) {
$charset = '';
if($part->ifparameters) {
foreach($part->parameters as $object) {
if(strtolower($object->attribute) == 'charset') {
$charset = $object->value;
}
}
}
return $charset;
}
protected function mime_header_decode($h){
return iconv_mime_decode($h, ICONV_MIME_DECODE_CONTINUE_ON_ERROR, 'UTF-8');
}
}
/* end */
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