(PHP Extension) Download GMail Message Attachment by ID

Demonstrates how to download a GMail email attachment by the attachment ID.

For more information, see https://developers.google.com/gmail/api/v1/reference/users/messages/attachments/get

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$http = new CkHttp();

$http->put_AuthToken('ACCESS_TOKEN');
$http->put_Accept('application/json');

// See the following example:  Get GMail Message (format=full)
// It shows how to download an email by message ID, and it shows how to parse the JSON
// response which includes attachment names, ids, and other information.

// This example will assume we already have the attachment id and filename.

// This is the attachment ID for a file named "helloWorld.pdf".
$attachmentId = 'ANGjdJ-oy3aCuZISJKLAhUdaEksCEklbAPyMaWzFgqOMGbPCRkgwgeu_Kttd99C17OBTHROkDZGekibTKWXGfscB5ww7fw4E65_V1dQ-jHhb2TD1Cdm58-BbNw2iDxzptco8iILPiSnLLfFn5Ps7nsRcxHaGTt3r0yqFKCuIYNnPK1vM04BXI_cfzo-HnI4I3tD6oHNHOGVQrL01MdShFQjPELPUjXM8z1qs7Kom-QyvV1iOldUN-66UuhynsmDX-CMM5TIdB-8KD_lmdhf-0DqG8JnCA20XpXyfqwS8XFkPA-t-QSjb7SdkHQFtQ4lz2PcBREFzZ2eI5j0l0Y_dQHRPYTeMwkVl1yl4MfFT4C4iso3VSF-eqaIjiFCbXKCFNyeEIW5WFsv189dhlSqU';

$messageId = '1712bc1dc22da2a2';

$http->SetUrlVar('messageId',$messageId);
$http->SetUrlVar('attachmentId',$attachmentId);

$url = 'https://www.googleapis.com/gmail/v1/users/userId/messages/{$messageId}/attachments/{$attachmentId}';

// When we download, the response is JSON that contains the attachment data base64url encoded, like this:
// {
//  "size": 934,
//  "data": "JVBERi0xLjM ... CiUlRU9GCg=="
// }

$outputFilePath = 'qa_output/helloWorld.pdf';

// Download into a StringBuilder.
$sbJson = new CkStringBuilder();
$success = $http->DownloadSb($url,'utf-8',$sbJson);
if ($success == false) {
    print $http->lastErrorText() . "\n";
    exit;
}

if ($http->get_LastStatus() != 200) {
    // Something failed.
    // the JSON contains an error message.
    print $sbJson->getAsString() . "\n";
    exit;
}

// Load into a Chilkat JSON object.
$json = new CkJsonObject();
$success = $json->LoadSb($sbJson);

// Extract the base64url data into a BinData.
$bd = new CkBinData();
$success = $json->BytesOf('data','base64url',$bd);

// Save the data to a file.
$success = $bd->WriteFile('qa_output/helloWorld.pdf');

print 'Success.' . "\n";

?>