Extracting Attachments From Emails With PHP

demo · 发表于 2014-2-11 22:27:53

本帖最后由 demo 于 2014-2-12 14:31 编辑

Yesterday I wrote about how to read emails with PHP, but I want to dig a bit deeper and discuss another part of the My Slow Low project that needed tackling: Extracting attachments from emails with PHP. For the purposes of this post, I will be specifically discussing file attachments, not HTML inline attached files.
This project was executed with CodeIgniter 2.0 so there are a few libraries and helper functions used that will not be available in other frameworks or with straight PHP, however, their functionality can be pretty easily replicated.

function email_pull() {
// load the Email_reader library from previous post
$this->load->library('email_reader');
// load the meals_model to store meal information
$this->load->model('meals_model');
// this method is run on a cronjob and should process all emails in the inbox
while (1) {
// get an email
$email = $this->email_reader->get();
// if there are no emails, jump out
if (count($email) <= 0) {
break;
}
$attachments = array();
// check for attachments
if (isset($email['structure']->parts) && count($email['structure']->parts)) {
// loop through all attachments
for ($i = 0; $i < count($email['structure']->parts); $i++) {
// set up an empty attachment
$attachments[$i] = array(
'is_attachment' => FALSE,
'filename' => '',
'name' => '',
'attachment' => ''
);
// if this attachment has idfparameters, then proceed
if ($email['structure']->parts[$i]->ifdparameters) {
foreach ($email['structure']->parts[$i]->dparameters as $object) {
// if this attachment is a file, mark the attachment and filename
if (strtolower($object->attribute) == 'filename') {
$attachments[$i]['is_attachment'] = TRUE;
$attachments[$i]['filename'] = $object->value;
}
}
}
// if this attachment has ifparameters, then proceed as above
if ($email['structure']->parts[$i]->ifparameters) {
foreach ($email['structure']->parts[$i]->parameters as $object) {
if (strtolower($object->attribute) == 'name') {
$attachments[$i]['is_attachment'] = TRUE;
$attachments[$i]['name'] = $object->value;
}
}
}
// if we found a valid attachment for this 'part' of the email, process the attachment
if ($attachments[$i]['is_attachment']) {
// get the content of the attachment
$attachments[$i]['attachment'] = imap_fetchbody($this->email_reader->conn, $email['index'], $i+1);
// check if this is base64 encoding
if ($email['structure']->parts[$i]->encoding == 3) { // 3 = BASE64
$attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
}
// otherwise, check if this is "quoted-printable" format
elseif ($email['structure']->parts[$i]->encoding == 4) { // 4 = QUOTED-PRINTABLE
$attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
}
}
}
}
// for My Slow Low, check if I found an image attachment
$found_img = FALSE;
foreach ($attachments as $a) {
if ($a['is_attachment'] == 1) {
// get information on the file
$finfo = pathinfo($a['filename']);
// check if the file is a jpg, png, or gif
if (preg_match('/(jpg|gif|png)/i', $finfo['extension'], $n)) {
$found_img = TRUE;
// process the image (save, resize, crop, etc.)
$fname = $this->_process_img($a['attachment'], $n[1]);
break;
}
}
}
// if there was no image, move the email to the Rejected folder on the server
if ( ! $found_img) {
$this->email_reader->move($email['index'], 'INBOX.Rejected');
continue;
}
// get content from the email that I want to store
$addr = $email['header']->from[0]->mailbox."@".$email['header']->from[0]->host;
$sender = $email['header']->from[0]->mailbox;
$text = ( ! empty($email['header']->subject) ? $email['header']->subject : '');
// move the email to Processed folder on the server
$this->email_reader->move($email['index'], 'INBOX.Processed');
// add the data to the database
$this->meals_model->add(array(
'username' => $sender,
'email' => $addr,
'photo' => $fname,
'description' => ($text == '' ? NULL : $text)
));
// don't slam the server
sleep(1);
}
// close the connection to the IMAP server
$this->email_reader->close();
}

复制代码

I tried to comment the code above as best as possible to convey what it is I am doing with the information. This code is a method within a Controller, but I’ve only included the attachment extraction method of the class for this post.
For more information and to credit those I’ve learned from, please check out David Walsh’s post on Retriev[ing] Your Gmail Emails with PHP and IMAP as well as Chris Hope’s post on Extracting attachments from an email message using PHP IMAP functions.

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