view.php

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<?php
// page owner library sets this based on URL
$user = elgg_get_page_owner_entity();

// Get the size
$size = strtolower(get_input('size'));
if (!in_array($size, array('master', 'large', 'medium', 'small', 'tiny', 'topbar'))) {
    $size = 'medium';
}

// If user doesn't exist, return default icon
if (!$user) {
    $url = "_graphics/icons/default/{$size}.png";
    $url = elgg_normalize_url($url);
    forward($url);
}

$user_guid = $user->getGUID();

// Try and get the icon
$filehandler = new ElggFile();
$filehandler->owner_guid = $user_guid;
$filehandler->setFilename("profile/{$user_guid}{$size}.jpg");

$success = false;

try {
    if ($filehandler->open("read")) {
        if ($contents = $filehandler->read($filehandler->getSize())) {
            $success = true;
        }
    }
} catch (InvalidParameterException $e) {
    elgg_log("Unable to get avatar for user with GUID $user_guid", 'ERROR');
}


if (!$success) {
    $url = "_graphics/icons/default/{$size}.png";
    $url = elgg_normalize_url($url);
    forward($url);
}

header("Content-type: image/jpeg", true);
header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', strtotime("+6 months")), true);
header("Pragma: public", true);
header("Cache-Control: public", true);
header("Content-Length: " . strlen($contents));

echo $contents;