Google picker and backend file download

Question

I\'m using google picker in my web app to allow user to browse and select files from his google drive. Once he makes the selection, picker returns various data about selecte

Answer 1

Finally, I found a solution.

If you want to download a file, you need two variables - oAuthToken and fileId

oAuthToken you get from JS client side when user authenticates. If you use the example from google docs (https://developers.google.com/picker/docs/), the function looks like this:

function handleAuthResult(authResult) {
    if (authResult && !authResult.error) {
        oauthToken = authResult.access_token;
        oauthToken; // <-- THIS IS THE Bearer token
        createPicker();
        }
}

fileId you get from when user picks a file. Again, a modified example from google docs:

function pickerCallback(data) {
    if (data[google.picker.Response.ACTION] == google.picker.Action.PICKED) {
        var doc = data[google.picker.Response.DOCUMENTS][0];
        alert('You picked fileId: ' + doc[google.picker.Document.ID]);
    }
}

Probably you will pass these data as a form request, or through ajax. Simple cURL call from backend to download the file:

$oAuthToken = 'ya29.XXXXXXXXXXXXXXXXXXXXXXXXX-XXXXXXXXX-XXXXXXX-XXXXXX-X-XXXXXXXXXXXX-XXXX';
$fileId = '0B4zzcXXXXXXXXXXXXXXXXXXXXXX';

$getUrl = 'https://www.googleapis.com/drive/v2/files/' . $fileId . '?alt=media';
$authHeader = 'Authorization: Bearer ' . $oAuthToken ;


$ch = curl_init($url);

curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

curl_setopt($ch, CURLOPT_HTTPHEADER, [$authHeader]);

$data = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$error = curl_errno($ch);


$data = curl_exec($ch);
$error = curl_error($ch);
curl_close($ch);

file_put_contents("destination-file.jpg", $data);

Docs about file download: https://developers.google.com/drive/web/manage-downloads Actually, everything was given to us, but we couldn't move our brains a little to make out the actual code :)