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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Application-level blob-management functions
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
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../../');
exit;
}
/**
* Return the URL which will output $blobid from the database when requested, $absolute or relative
* @param $blobid
* @param bool $absolute
* @return mixed|string
*/
function qa_get_blob_url($blobid, $absolute = false)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return qa_path('blob', array('qa_blobid' => $blobid), $absolute ? qa_opt('site_url') : null, QA_URL_FORMAT_PARAMS);
}
/**
* Return the full path to the on-disk directory for blob $blobid (subdirectories are named by the first 3 digits of $blobid)
* @param $blobid
* @return mixed|string
*/
function qa_get_blob_directory($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return rtrim(QA_BLOBS_DIRECTORY, '/') . '/' . substr(str_pad($blobid, 20, '0', STR_PAD_LEFT), 0, 3);
}
/**
* Return the full page and filename of blob $blobid which is in $format ($format is used as the file name suffix e.g. .jpg)
* @param $blobid
* @param $format
* @return mixed|string
*/
function qa_get_blob_filename($blobid, $format)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return qa_get_blob_directory($blobid) . '/' . $blobid . '.' . preg_replace('/[^A-Za-z0-9]/', '', $format);
}
/**
* Create a new blob (storing the content in the database or on disk as appropriate) with $content and $format, returning its blobid.
* Pass the original name of the file uploaded in $sourcefilename and the $userid, $cookieid and $ip of the user creating it
* @param $content
* @param $format
* @param $sourcefilename
* @param $userid
* @param $cookieid
* @param $ip
* @return mixed|null|string
*/
function qa_create_blob($content, $format, $sourcefilename = null, $userid = null, $cookieid = null, $ip = null)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'db/blobs.php';
$blobid = qa_db_blob_create(defined('QA_BLOBS_DIRECTORY') ? null : $content, $format, $sourcefilename, $userid, $cookieid, $ip);
if (isset($blobid) && defined('QA_BLOBS_DIRECTORY')) {
// still write content to the database if writing to disk failed
if (!qa_write_blob_file($blobid, $content, $format))
qa_db_blob_set_content($blobid, $content);
}
return $blobid;
}
/**
* Write the on-disk file for blob $blobid with $content and $format. Returns true if the write succeeded, false otherwise.
* @param $blobid
* @param $content
* @param $format
* @return bool|mixed
*/
function qa_write_blob_file($blobid, $content, $format)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
$written = false;
$directory = qa_get_blob_directory($blobid);
if (is_dir($directory) || mkdir($directory, fileperms(rtrim(QA_BLOBS_DIRECTORY, '/')) & 0777)) {
$filename = qa_get_blob_filename($blobid, $format);
$file = fopen($filename, 'xb');
if (is_resource($file)) {
if (fwrite($file, $content) >= strlen($content))
$written = true;
fclose($file);
if (!$written)
unlink($filename);
}
}
return $written;
}
/**
* Retrieve blob $blobid from the database, reading the content from disk if appropriate
* @param $blobid
* @return array|mixed|null
*/
function qa_read_blob($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'db/blobs.php';
$blob = qa_db_blob_read($blobid);
if (isset($blob) && defined('QA_BLOBS_DIRECTORY') && !isset($blob['content']))
$blob['content'] = qa_read_blob_file($blobid, $blob['format']);
return $blob;
}
/**
* Read the content of blob $blobid in $format from disk. On failure, it will return false.
* @param $blobid
* @param $format
* @return mixed|null|string
*/
function qa_read_blob_file($blobid, $format)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
$filename = qa_get_blob_filename($blobid, $format);
if (is_readable($filename))
return file_get_contents($filename);
else
return null;
}
/**
* Delete blob $blobid from the database, and remove the on-disk file if appropriate
* @param $blobid
* @return mixed
*/
function qa_delete_blob($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'db/blobs.php';
if (defined('QA_BLOBS_DIRECTORY')) {
$blob = qa_db_blob_read($blobid);
if (isset($blob) && !isset($blob['content']))
unlink(qa_get_blob_filename($blobid, $blob['format']));
}
qa_db_blob_delete($blobid);
}
/**
* Delete the on-disk file for blob $blobid in $format
* @param $blobid
* @param $format
* @return mixed
*/
function qa_delete_blob_file($blobid, $format)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
unlink(qa_get_blob_filename($blobid, $format));
}
/**
* Check if blob $blobid exists
* @param $blobid
* @return bool|mixed
*/
function qa_blob_exists($blobid)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
require_once QA_INCLUDE_DIR . 'db/blobs.php';
return qa_db_blob_exists($blobid);
}