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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Outputs image for a specific blob at a specific size, caching as appropriate
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
// Ensure no PHP errors are shown in the image data
@ini_set('display_errors', 0);
function qa_image_db_fail_handler()
{
header('HTTP/1.1 500 Internal Server Error');
qa_exit('error');
}
// Load the Q2A base file which sets up a bunch of crucial stuff
$qa_autoconnect = false;
require 'qa-base.php';
qa_report_process_stage('init_image');
// Retrieve the scaled image from the cache if available
require_once QA_INCLUDE_DIR . 'db/cache.php';
qa_db_connect('qa_image_db_fail_handler');
qa_initialize_postdb_plugins();
$blobid = qa_get('qa_blobid');
$size = (int)qa_get('qa_size');
$cachetype = 'i_' . $size;
$content = qa_db_cache_get($cachetype, $blobid); // see if we've cached the scaled down version
header('Cache-Control: max-age=2592000, public'); // allows browsers and proxies to cache images too
if (isset($content)) {
header('Content-Type: image/jpeg');
echo $content;
} else {
require_once QA_INCLUDE_DIR . 'app/options.php';
require_once QA_INCLUDE_DIR . 'app/blobs.php';
require_once QA_INCLUDE_DIR . 'util/image.php';
// Otherwise retrieve the raw image and scale as appropriate
$blob = qa_read_blob($blobid);
if (isset($blob)) {
if ($size > 0)
$content = qa_image_constrain_data($blob['content'], $width, $height, $size);
else
$content = $blob['content'];
if (isset($content)) {
header('Content-Type: image/jpeg');
echo $content;
if (strlen($content) && ($size > 0)) {
// to prevent cache being filled with inappropriate sizes
$cachesizes = qa_get_options(array('avatar_profile_size', 'avatar_users_size', 'avatar_q_page_q_size', 'avatar_q_page_a_size', 'avatar_q_page_c_size', 'avatar_q_list_size'));
if (array_search($size, $cachesizes))
qa_db_cache_set($cachetype, $blobid, $content);
}
}
}
}
qa_db_disconnect();