我正在构建一个小接口，通过标准输入从 postfix 管道消息，并希望从电子邮件中删除附件/无论如何，我不想删除所有附件，只是那些太大而无法通过电子邮件发送的附件。
我发现 MimeMailParser 是一个很好的起点，并对它的代码进行了一些修改（公开了一些私有方法，以便将它们称为 seperatley）。这是我的版本中的课程：
<?php
require_once('attachment.class.php');
/**
* Fast Mime Mail parser Class using PHP's MailParse Extension
* @author gabe@fijiwebdesign.com
* @url http://www.fijiwebdesign.com/
* @license http://creativecommons.org/licenses/by-sa/3.0/us/
* @version $Id$
*/
class MimeMailParser {
/**
* PHP MimeParser Resource ID
*/
public $resource;
/**
* A file pointer to email
*/
public $stream;
/**
* A text of an email
*/
public $data;
/**
* Stream Resources for Attachments
*/
public $attachment_streams;
public $parts;
/**
* Inialize some stuff
* @return
*/
public function __construct() {
$this->attachment_streams = array();
}
/**
* Free the held resouces
* @return void
*/
public function __destruct() {
// clear the email file resource
if (is_resource($this->stream)) {
fclose($this->stream);
}
// clear the MailParse resource
if (is_resource($this->resource)) {
mailparse_msg_free($this->resource);
}
// remove attachment resources
foreach($this->attachment_streams as $stream) {
fclose($stream);
}
}
/**
* Set the file path we use to get the email text
* @return Object MimeMailParser Instance
* @param $mail_path Object
*/
public function setPath($path) {
// should parse message incrementally from file
$this->resource = mailparse_msg_parse_file($path);
$this->stream = fopen($path, 'r');
$this->parse();
return $this;
}
/**
* Set the Stream resource we use to get the email text
* @return Object MimeMailParser Instance
* @param $stream Resource
*/
public function setStream($stream) {
// streams have to be cached to file first
if (get_resource_type($stream) == 'stream') {
$tmp_fp = tmpfile();
if ($tmp_fp) {
while(!feof($stream)) {
fwrite($tmp_fp, fread($stream, 2028));
}
fseek($tmp_fp, 0);
$this->stream =& $tmp_fp;
} else {
throw new Exception('Could not create temporary files for attachments. Your tmp directory may be unwritable by PHP.');
return false;
}
fclose($stream);
} else {
$this->stream = $stream;
}
$this->resource = mailparse_msg_create();
// parses the message incrementally low memory usage but slower
while(!feof($this->stream)) {
mailparse_msg_parse($this->resource, fread($this->stream, 2082));
}
$this->parse();
return $this;
}
/**
* Set the email text
* @return Object MimeMailParser Instance
* @param $data String
*/
public function setText($data) {
$this->resource = mailparse_msg_create();
// does not parse incrementally, fast memory hog might explode
mailparse_msg_parse($this->resource, $data);
$this->data = $data;
$this->parse();
return $this;
}
/**
* Parse the Message into parts
* @return void
* @private
*/
private function parse() {
$structure = mailparse_msg_get_structure($this->resource);
$this->parts = array();
foreach($structure as $part_id) {
$part = mailparse_msg_get_part($this->resource, $part_id);
$this->parts[$part_id] = mailparse_msg_get_part_data($part);
}
}
/**
* Retrieve the Email Headers
* @return Array
*/
public function getHeaders() {
if (isset($this->parts[1])) {
return $this->getPartHeaders($this->parts[1]);
} else {
throw new Exception('MimeMailParser::setPath() or MimeMailParser::setText() must be called before retrieving email headers.');
}
return false;
}
/**
* Retrieve the raw Email Headers
* @return string
*/
public function getHeadersRaw() {
if (isset($this->parts[1])) {
return $this->getPartHeaderRaw($this->parts[1]);
} else {
throw new Exception('MimeMailParser::setPath() or MimeMailParser::setText() must be called before retrieving email headers.');
}
return false;
}
/**
* Retrieve a specific Email Header
* @return String
* @param $name String Header name
*/
public function getHeader($name) {
if (isset($this->parts[1])) {
$headers = $this->getPartHeaders($this->parts[1]);
if (isset($headers[$name])) {
return $headers[$name];
}
} else {
throw new Exception('MimeMailParser::setPath() or MimeMailParser::setText() must be called before retrieving email headers.');
}
return false;
}
/**
* Returns the email message body in the specified format
* @return Mixed String Body or False if not found
* @param $type Object[optional]
*/
public function getMessageBody($type = 'text') {
$body = false;
$mime_types = array(
'text'=> 'text/plain',
'html'=> 'text/html'
);
if (in_array($type, array_keys($mime_types))) {
foreach($this->parts as $part) {
if ($this->getPartContentType($part) == $mime_types[$type]) {
$headers = $this->getPartHeaders($part);
$body = $this->getPartBody($part);
break;
}
}
} else {
throw new Exception('Invalid type specified for MimeMailParser::getMessageBody. "type" can either be text or html.');
}
return $body;
}
/**
* get the headers for the message body part.
* @return Array
* @param $type Object[optional]
*/
public function getMessageBodyHeaders($type = 'text') {
$headers = false;
$mime_types = array(
'text'=> 'text/plain',
'html'=> 'text/html'
);
if (in_array($type, array_keys($mime_types))) {
foreach($this->parts as $part) {
if ($this->getPartContentType($part) == $mime_types[$type]) {
$headers = $this->getPartHeaders($part);
break;
}
}
} else {
throw new Exception('Invalid type specified for MimeMailParser::getMessageBody. "type" can either be text or html.');
}
return $headers;
}
/**
* Returns inline content files.
* @return Array
*/
public function getInlineContent() {
$content = array();
foreach($this->parts as $part) {
$content_id = $this->getPartContentId($part);
if ($content_id !== FALSE) {
$content[] = new MimeMailParser_attachment(
$this->getPartContentName($part),
$this->getPartContentType($part),
$this->getAttachmentStream($part),
$this->getPartContentDisposition($part),
$this->getPartHeaders($part)
);
}
}
return $content;
}
/**
* Returns the attachments contents in order of appearance
* @return Array
* @param $type Object[optional]
*/
public function getAttachments() {
$attachments = array();
$dispositions = array("attachment","inline");
foreach($this->parts as $part) {
$disposition = $this->getPartContentDisposition($part);
if (in_array($disposition, $dispositions) === TRUE) {
if (isset($part['disposition-filename']) === FALSE) {
$part['disposition-filename'] = md5(uniqid());
}
$attachments[] = new MimeMailParser_attachment(
$part['disposition-filename'],
$this->getPartContentType($part),
$this->getAttachmentStream($part),
$disposition,
$this->getPartHeaders($part)
);
}
}
return $attachments;
}
/**
* Return the Headers for a MIME part
* @return Array
* @param $part Array
*/
private function getPartHeaders($part) {
if (isset($part['headers'])) {
return $part['headers'];
}
return false;
}
/**
* Return a Specific Header for a MIME part
* @return Array
* @param $part Array
* @param $header String Header Name
*/
private function getPartHeader($part, $header) {
if (isset($part['headers'][$header])) {
return $part['headers'][$header];
}
return false;
}
/**
* Return the ContentType of the MIME part
* @return String
* @param $part Array
*/
private function getPartContentType($part) {
if (isset($part['content-type'])) {
return $part['content-type'];
}
return false;
}
/**
* Return the ContentName of the MIME part
* @return String
* @param $part Array
*/
private function getPartContentName($part) {
if (isset($part['content-name'])) {
return $part['content-name'];
}
return false;
}
/**
* Return the Content Disposition
* @return String
* @param $part Array
*/
private function getPartContentDisposition($part) {
if (isset($part['content-disposition'])) {
return $part['content-disposition'];
}
return false;
}
/**
* Return the Content id
* @return String
* @param $part Array
*/
private function getPartContentId($part) {
if (isset($part['content-id'])) {
return $part['content-id'];
}
return false;
}
/**
* Retrieve the raw Header of a MIME part
* @return String
* @param $part Object
*/
private function getPartHeaderRaw(&$part) {
$header = '';
if ($this->stream) {
$header = $this->getPartHeaderFromFile($part);
} else if ($this->data) {
$header = $this->getPartHeaderFromText($part);
} else {
throw new Exception('MimeMailParser::setPath() or MimeMailParser::setText() must be called before retrieving email parts.');
}
return $header;
}
/**
* Retrieve the Body of a MIME part
* @return String
* @param $part Object
*/
private function getPartBody(&$part) {
$body = '';
if ($this->stream) {
$body = $this->getPartBodyFromFile($part);
} else if ($this->data) {
$body = $this->getPartBodyFromText($part);
} else {
throw new Exception('MimeMailParser::setPath() or MimeMailParser::setText() must be called before retrieving email parts.');
}
return $body;
}
/**
* Retrieve the Header from a MIME part from file
* @return String Mime Header Part
* @param $part Array
*/
private function getPartHeaderFromFile(&$part) {
$start = $part['starting-pos'];
$end = $part['starting-pos-body'];
fseek($this->stream, $start, SEEK_SET);
$header = fread($this->stream, $end-$start);
return $header;
}
/**
* Retrieve the Body from a MIME part from file
* @return String Mime Body Part
* @param $part Array
*/
private function getPartBodyFromFile(&$part) {
$start = $part['starting-pos-body'];
$end = $part['ending-pos-body'];
fseek($this->stream, $start, SEEK_SET);
$body = fread($this->stream, $end-$start);
return $body;
}
/**
* Retrieve the Header from a MIME part from text
* @return String Mime Header Part
* @param $part Array
*/
public function getPartHeaderFromText(&$part) {
$start = $part['starting-pos'];
$end = $part['starting-pos-body'];
$header = substr($this->data, $start, $end-$start);
return $header;
}
/**
* Retrieve the Body from a MIME part from text
* @return String Mime Body Part
* @param $part Array
*/
public function getPartBodyFromText(&$part) {
$start = $part['starting-pos-body'];
$end = $part['ending-pos-body'];
$body = substr($this->data, $start, $end-$start);
return $body;
}
/**
* Read the attachment Body and save temporary file resource
* @return String Mime Body Part
* @param $part Array
*/
private function getAttachmentStream(&$part) {
$temp_fp = tmpfile();
array_key_exists('content-transfer-encoding', $part['headers']) ? $encoding = $part['headers']['content-transfer-encoding'] : $encoding = '';
if ($temp_fp) {
if ($this->stream) {
$start = $part['starting-pos-body'];
$end = $part['ending-pos-body'];
fseek($this->stream, $start, SEEK_SET);
$len = $end-$start;
$written = 0;
$write = 2028;
$body = '';
while($written < $len) {
if (($written+$write < $len )) {
$write = $len - $written;
}
$part = fread($this->stream, $write);
fwrite($temp_fp, $this->decode($part, $encoding));
$written += $write;
}
} else if ($this->data) {
$attachment = $this->decode($this->getPartBodyFromText($part), $encoding);
fwrite($temp_fp, $attachment, strlen($attachment));
}
fseek($temp_fp, 0, SEEK_SET);
} else {
throw new Exception('Could not create temporary files for attachments. Your tmp directory may be unwritable by PHP.');
return false;
}
return $temp_fp;
}
/**
* Decode the string depending on encoding type.
* @return String the decoded string.
* @param $encodedString The string in its original encoded state.
* @param $encodingType The encoding type from the Content-Transfer-Encoding header of the part.
*/
public function decode($encodedString, $encodingType) {
if (strtolower($encodingType) == 'base64') {
return base64_decode($encodedString);
} else if (strtolower($encodingType) == 'quoted-printable') {
return quoted_printable_decode($encodedString);
} else {
return $encodedString;
}
}
}
?>
我调用代码并按如下方式使用它：
<?php
ini_set("display_errors","on");
error_reporting(E_ALL);
require_once('MimeMailParser.class.php');
$Parser = new MimeMailParser();
$Parser->setText(file_get_contents('php://stdin'));
$attachments = $Parser->getAttachments();
/*foreach($attachments as $attachment) {
echo $attachment->filename;
}*/
echo $Parser->getHeadersRaw(); # print email header
foreach ($Parser->parts as $xPart=>$yPart) {
if ($xPart=='1') {
continue;
}
echo $Parser->getPartHeaderFromText($yPart);
echo $Parser->getPartBodyFromText($yPart);
}
?>
发送消息并且所有内容都显示正常 - 除了一个问题 - 不显示附件。虽然，当我单击“显示原始”时，作为 base64 编码的附件确实出现在消息源上。
任何想法？