(PHP Extension) Download Binary File to In-Memory Bytes

This example demonstrates how to download the binary content of a file from Google Drive directly into local memory.

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");

$success = true;

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

// This example uses a previously obtained access token having permission for the 
// Google Drive scope.

$gAuth = new CkAuthGoogle();
$gAuth->put_AccessToken('GOOGLE-DRIVE-ACCESS-TOKEN');

$rest = new CkRest();

// Connect using TLS.
// A single REST object, once connected, can be used for many Google Drive REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
$bAutoReconnect = true;
$success = $rest->Connect('www.googleapis.com',443,true,$bAutoReconnect);

// Provide the authentication credentials (i.e. the access token)
$rest->SetAuthGoogle($gAuth);

// ------------------------------------------------------------------------------
// To download a file, we must know the file ID.
// In a previous example (see Build Local Metadata Cache
// we built a local cache to make it easy to lookup file IDs given a file path.
// Let's say we want to download "testFolder/abc/123/penguins.jpg".
// First we lookup the fileId in the cache.  With the fileId, we can download the file.
$gdCache = new CkCache();
$gdCache->put_Level(0);
$gdCache->AddRoot('C:/ckCache/googleDrive');

$fileId = $gdCache->fetchText('testFolder/abc/123/penguins.jpg');
if ($gdCache->get_LastMethodSuccess() != true) {
    print 'Filepath not found in cache.' . "\n";
    exit;
}

// We need to send a GET request like this:
// GET https://www.googleapis.com/drive/v3/files/fileId?alt=media
// The fileId is part of the path.
$sbPath = new CkStringBuilder();
$sbPath->Append('/drive/v3/files/');
$sbPath->Append($fileId);
$rest->AddQueryParam('alt','media');

// To download to memory, we'll send the request in one call, then receive
// the response header, and then the response body.
// If the response header indicates failure or an unexpected response, then the
// body is not the data we desire.

// First send the HTTP request.
$success = $rest->SendReqNoBody('GET',$sbPath->getAsString());
if ($success != true) {
    print $rest->lastErrorText() . "\n";
    exit;
}

// Get the response header.
$statusCode = $rest->ReadResponseHeader();
if ($statusCode != 200) {
    print 'response status code = ' . $rest->get_ResponseStatusCode() . "\n";
    print 'response status text = ' . $rest->responseStatusText() . "\n";
    print 'response header: ' . $rest->responseHeader() . "\n";

    // Read the response body (which should be error text or HTML)
    $errResponseBody = $rest->readRespBodyString();
    if ($rest->get_LastMethodSuccess() == true) {
        print 'response body: ' . $errResponseBody . "\n";
    }

    exit;
}

// Read the response body, which should contain the file data.
$jpgBytes = new CkByteData();
$success = $rest->ReadRespBodyBinary($jpgBytes);
if ($rest->get_LastMethodSuccess() != true) {
    print $rest->lastErrorText() . "\n";
    exit;
}

// Save jpgBytes to a file so we can examine the file to verify that it worked.
$fac = new CkFileAccess();
$fac->WriteEntireFile('qa_output/penguins_out.jpg',$jpgBytes);

print 'File downloaded.' . "\n";

?>