我将PHP SDK用于新的Gmail API。如何从电子邮件中获取附件？
Here是API文档，但在本例中，它缺少PHP的示例。虽然我已经看到人们用PHP实现这一点。
修改
这是我到目前为止所做的，不确定它是否正确：
$attachmentData = $service->users_messages_attachments->get($emailAccount, $messageId, $attachmentId);
$myfile = fopen("excel.xlsx", "w");
fwrite($myfile, $attachmentData);
fclose($myfile);
答案 0 :(得分：7)
首先，我们需要从附件对象中获取数据：
$attachmentObj = $service->users_messages_attachments->get($emailAccount, $messageId, $attachmentId);
$data = $attachmentObj->getData(); //Get data from attachment object
然后在写入文件之前，将数据转换为标准RFC 4648 base64-encoding：
$data = strtr($data, array('-' => '+', '_' => '/'));
$myfile = fopen("excel.xlsx", "w+");;
fwrite($myfile, base64_decode($data));
fclose($myfile);
它现在有效！
答案 1 :(得分：1)
function getAttachment($messageId, $partId, $userId)
{
try {
$client = getClient();
$gmail = new Google_Service_Gmail($client);
$message = $gmail->users_messages->get($userId, $messageId);
$message_payload_details = $message->getPayload()->getParts();
$attachmentDetails = array();
$attachmentDetails['attachmentId'] = $message_payload_details[$partId]['body']['attachmentId'];
$attachmentDetails['headers'] = $message_payload_details[$partId]['headers'];
$attachment = $gmail->users_messages_attachments->get($userId, $messageId, $attachmentDetails['attachmentId']);
$attachmentDetails['data'] = $attachment->data;
return ['status' => true, 'data' => $attachmentDetails];
} catch (\Google_Service_Exception $e) {
return ['status' => false, 'message' => $e->getMessage()];
}
}
function base64_to_jpeg($base64_string, $content_type) {
$find = ["_","-"]; $replace = ["/","+"];
$base64_string = str_replace($find,$replace,$base64_string);
$url_str = 'data:'.$content_type.','.$base64_string;
$base64_string = "url(".$url_str.")";
$data = explode(',', $base64_string);
return base64_decode( $data[ 1 ] );
}
// Get the API client and construct the service object.
$client = getClient();
$service = new Google_Service_Gmail($client);
$opt_param = array();
$opt_param['labelIds'] = 'INBOX';
$opt_param['maxResults'] = 1;
$messages = $service->users_messages->listUsersMessages($userId, $opt_param);
foreach ($messages as $message_thread) {
$message = $service->users_messages->get($userId, $message_thread['id']);
$message_parts = $message->getPayload()->getParts();
$files = array();
$attachId = $message_parts[1]['body']['attachmentId'];
$attach = $service->users_messages_attachments->get($userId, $message['id'], $attachId);
foreach ($message_parts as $key => $value) {
if ( isset($value->body->attachmentId) && !isset($value->body->data)) {
array_push($files, $value['partId']);
}
}
}
if(isset($_GET['messageId']) && $_GET['part_id']){ // This is After Clicking an Attachment
$attachment = getAttachment($_GET['messageId'], $_GET['part_id'], $userId);
$content_type = "";
foreach ($attachment['data']['headers'] as $key => $value) {
if($value->name == 'Content-Type'){ $content_type = $value->value; }
header($value->name.':'.$value->value);
}
$content_type_val = current(explode("/",$content_type));
$media_types = ["video", "image", "application"];
if(in_array($content_type_val, $media_types )){
echo base64_to_jpeg($attachment['data']['data'], $content_type); // Only for Image files
} else {
echo base64_decode($attachment['data']['data']); // Other than Image Files
}
} else { // Listing All Attachments
if(!empty($files)) {
foreach ($files as $key => $value) {
echo '<a target="_blank" href="index.php?messageId='.$message['id'].'&part_id='.$value.'">Attachment '.($key+1).'</a><br/>';
}
}
}
答案 2 :(得分：0)
如果适用于您，请尝试使用此thread中的代码。
<?php
/**
* Gmail attachment extractor.
*
* Downloads attachments from Gmail and saves it to a file.
* Uses PHP IMAP extension, so make sure it is enabled in your php.ini,
* extension=php_imap.dll
*
*/
set_time_limit(3000);
/* connect to gmail with your credentials */
$hostname = '{imap.gmail.com:993/imap/ssl}INBOX';
$username = 'YOUR_GMAIL_USERNAME'; # e.g somebody@gmail.com
$password = 'YOUR_GMAIL_PASSWORD';
/* try to connect */
$inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error());
/* get all new emails. If set to 'ALL' instead
* of 'NEW' retrieves all the emails, but can be
* resource intensive, so the following variable,
* $max_emails, puts the limit on the number of emails downloaded.
*
*/
$emails = imap_search($inbox,'ALL');
/* useful only if the above search is set to 'ALL' */
$max_emails = 16;
/* if any emails found, iterate through each email */
if($emails) {
$count = 1;
/* put the newest emails on top */
rsort($emails);
/* for every email... */
foreach($emails as $email_number)
{
/* get information specific to this email */
$overview = imap_fetch_overview($inbox,$email_number,0);
/* get mail message, not actually used here.
Refer to http://php.net/manual/en/function.imap-fetchbody.php
for details on the third parameter.
*/
$message = imap_fetchbody($inbox,$email_number,2);
/* get mail structure */
$structure = imap_fetchstructure($inbox, $email_number);
$attachments = array();
/* if any attachments found... */
if(isset($structure->parts) && count($structure->parts))
{
for($i = 0; $i < count($structure->parts); $i++)
{
$attachments[$i] = array(
'is_attachment' => false,
'filename' => '',
'name' => '',
'attachment' => ''
);
if($structure->parts[$i]->ifdparameters)
{
foreach($structure->parts[$i]->dparameters as $object)
{
if(strtolower($object->attribute) == 'filename')
{
$attachments[$i]['is_attachment'] = true;
$attachments[$i]['filename'] = $object->value;
}
}
}
if($structure->parts[$i]->ifparameters)
{
foreach($structure->parts[$i]->parameters as $object)
{
if(strtolower($object->attribute) == 'name')
{
$attachments[$i]['is_attachment'] = true;
$attachments[$i]['name'] = $object->value;
}
}
}
if($attachments[$i]['is_attachment'])
{
$attachments[$i]['attachment'] = imap_fetchbody($inbox, $email_number, $i+1);
/* 3 = BASE64 encoding */
if($structure->parts[$i]->encoding == 3)
{
$attachments[$i]['attachment'] = base64_decode($attachments[$i]['attachment']);
}
/* 4 = QUOTED-PRINTABLE encoding */
elseif($structure->parts[$i]->encoding == 4)
{
$attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
}
}
}
}
/* iterate through each attachment and save it */
foreach($attachments as $attachment)
{
if($attachment['is_attachment'] == 1)
{
$filename = $attachment['name'];
if(empty($filename)) $filename = $attachment['filename'];
if(empty($filename)) $filename = time() . ".dat";
/* prefix the email number to the filename in case two emails
* have the attachment with the same file name.
*/
$fp = fopen("./" . $email_number . "-" . $filename, "w+");
fwrite($fp, $attachment['attachment']);
fclose($fp);
}
}
if($count++ >= $max_emails) break;
}
}
/* close the connection */
imap_close($inbox);
echo "Done";
?>
有关更多信息，请查看此相关主题和SO问题
答案 3 :(得分：0)
也许其他人会在寻找简单的解决方案。请参见下面可用作Google脚本的脚本代码（Java脚本，请参见此处的入门教程：https://script.google.com/home/start）：
// GLOBALS
//Array of file extension which you would like to extract to Drive
var fileTypesToExtract = ['sql','gz'];
//Name of the folder in google drive i which files will be put
var folderName = 'BACKUPS';
//Name of the label which will be applied after processing the mail message
var labelName = 'SavedToGDrive';
function GmailToDrive(){
//build query to search emails
var query = '';
//uncomment to search by filetypes
//filename:jpg OR filename:tif OR filename:gif OR fileName:png OR filename:bmp OR filename:svg'; //'after:'+formattedDate+
//for(var i in fileTypesToExtract){
// query += (query === '' ?('filename:'+fileTypesToExtract[i]) : (' OR filename:'+fileTypesToExtract[i]));
//}
//query = 'in:inbox has:nouserlabels ' + query;
//search by label
query = 'label:backups-real-estate-backup';
//exclude already downloaded mails, so you can repeat running this script
if timeout happened
query = query + ' AND NOT label:savedtogdrive';
var threads = GmailApp.search(query);
var label = getGmailLabel_(labelName);
var parentFolder;
if(threads.length > 0){
parentFolder = getFolder_(folderName);
}
var root = DriveApp.getRootFolder();
for(var i in threads){
var mesgs = threads[i].getMessages();
for(var j in mesgs){
//get attachments
var attachments = mesgs[j].getAttachments();
for(var k in attachments){
var attachment = attachments[k];
var isDefinedType = checkIfDefinedType_(attachment);
if(!isDefinedType) continue;
var attachmentBlob = attachment.copyBlob();
var file = DriveApp.createFile(attachmentBlob);
parentFolder.addFile(file);
root.removeFile(file);
}
}
threads[i].addLabel(label);
}
}
//This function will get the parent folder in Google drive
function getFolder_(folderName){
var folder;
var fi = DriveApp.getFoldersByName(folderName);
if(fi.hasNext()){
folder = fi.next();
}
else{
folder = DriveApp.createFolder(folderName);
}
return folder;
}
//getDate n days back
// n must be integer
function getDateNDaysBack_(n){
n = parseInt(n);
var date = new Date();
date.setDate(date.getDate() - n);
return Utilities.formatDate(date, Session.getScriptTimeZone(), 'yyyy/MM/dd');
}
function getGmailLabel_(name){
var label = GmailApp.getUserLabelByName(name);
if(!label){
label = GmailApp.createLabel(name);
}
return label;
}
//this function will check for filextension type.
// and return boolean
function checkIfDefinedType_(attachment){
var fileName = attachment.getName();
var temp = fileName.split('.');
var fileExtension = temp[temp.length-1].toLowerCase();
if(fileTypesToExtract.indexOf(fileExtension) !== -1) return true;
else return false;
}
谢谢。