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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
File: qa-include/qa-app-upload.php
Description: Application-level file upload functionality
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;
}
function qa_get_max_upload_size()
/*
Return the maximum size of file that can be uploaded, based on database and PHP limits
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
$mindb = 16777215; // from MEDIUMBLOB column type
$minphp = trim(ini_get('upload_max_filesize'));
switch (strtolower(substr($minphp, -1))) {
case 'g':
$minphp *= 1024;
// fall-through
case 'm':
$minphp *= 1024;
// fall-through
case 'k':
$minphp *= 1024;
}
return min($mindb, $minphp);
}
function qa_upload_file($localfilename, $sourcefilename, $maxfilesize=null, $onlyimage=false, $imagemaxwidth=null, $imagemaxheight=null)
/*
Move an uploaded image or other file into blob storage. Pass the $localfilename where the file is currently stored
(temporarily) and the $sourcefilename of the file on the user's computer (if using PHP's usual file upload
mechanism, these are obtained from $_FILES[..]['tmp_name'] and $_FILES[..]['name'] fields respectively). To apply a
maximum file size (in bytes) beyond the general one, use $maxfilesize, otherwise set it to null. Set $onlyimage to
true if only image uploads (PNG, GIF, JPEG) are allowed. To apply a maximum width or height (in pixels) to uploaded
images, set $imagemaxwidth and $imagemaxheight. The function returns an array which may contain the following elements:
'error' => a string containing an error, if one occurred
'format' => the format (file extension) of the blob created (all scaled images end up as 'jpeg')
'width' => if an image, the width in pixels of the blob created (after possible scaling)
'height' => if an image, the height in pixels of the blob created (after possible scaling)
'blobid' => the blobid that was created (if there was no error)
'bloburl' => the url that can be used to view/download the created blob (if there was no error)
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
$result=array();
// Check per-user upload limits
require_once QA_INCLUDE_DIR.'app/users.php';
require_once QA_INCLUDE_DIR.'app/limits.php';
switch (qa_user_permit_error(null, QA_LIMIT_UPLOADS))
{
case 'limit':
$result['error']=qa_lang('main/upload_limit');
return $result;
case false:
qa_limits_increment(qa_get_logged_in_userid(), QA_LIMIT_UPLOADS);
break;
default:
$result['error']=qa_lang('users/no_permission');
return $result;
}
// Check the uploaded file is not too large
$filesize=filesize($localfilename);
if (isset($maxfilesize))
$maxfilesize=min($maxfilesize, qa_get_max_upload_size());
else
$maxfilesize=qa_get_max_upload_size();
if ( ($filesize<=0) || ($filesize>$maxfilesize) ) { // if file was too big for PHP, $filesize will be zero
$result['error']=qa_lang_sub('main/max_upload_size_x', number_format($maxfilesize/1048576, 1).'MB');
return $result;
}
// Find out what type of source file was uploaded and if appropriate, check it's an image and get preliminary size measure
$pathinfo=pathinfo($sourcefilename);
$format=strtolower(@$pathinfo['extension']);
$isimage=($format=='png') || ($format=='gif') || ($format=='jpeg') || ($format=='jpg'); // allowed image extensions
if ($isimage) {
$imagesize=@getimagesize($localfilename);
if (is_array($imagesize)) {
$result['width']=$imagesize[0];
$result['height']=$imagesize[1];
switch ($imagesize['2']) { // reassign format based on actual content, if we can
case IMAGETYPE_GIF:
$format='gif';
break;
case IMAGETYPE_JPEG:
$format='jpeg';
break;
case IMAGETYPE_PNG:
$format='png';
break;
}
}
}
$result['format']=$format;
if ($onlyimage)
if ( (!$isimage) || !is_array($imagesize) ) {
$result['error']=qa_lang_sub('main/image_not_read', 'GIF, JPG, PNG');
return $result;
}
// Read in the raw file contents
$content=file_get_contents($localfilename);
// If appropriate, get more accurate image size and apply constraints to it
require_once QA_INCLUDE_DIR.'util/image.php';
if ($isimage && qa_has_gd_image()) {
$image=@imagecreatefromstring($content);
if (is_resource($image)) {
$result['width']=$width=imagesx($image);
$result['height']=$height=imagesy($image);
if (isset($imagemaxwidth) || isset($imagemaxheight))
if (qa_image_constrain(
$width, $height,
isset($imagemaxwidth) ? $imagemaxwidth : $width,
isset($imagemaxheight) ? $imagemaxheight : $height
)) {
qa_gd_image_resize($image, $width, $height);
if (is_resource($image)) {
$content=qa_gd_image_jpeg($image);
$result['format']=$format='jpeg';
$result['width']=$width;
$result['height']=$height;
}
}
if (is_resource($image)) // might have been lost
imagedestroy($image);
}
}
// Create the blob and return
require_once QA_INCLUDE_DIR.'app/blobs.php';
$userid=qa_get_logged_in_userid();
$cookieid=isset($userid) ? qa_cookie_get() : qa_cookie_get_create();
$result['blobid']=qa_create_blob($content, $format, $sourcefilename, $userid, $cookieid, qa_remote_ip_address());
if (!isset($result['blobid'])) {
$result['error']=qa_lang('main/general_error');
return $result;
}
$result['bloburl']=qa_get_blob_url($result['blobid'], true);
return $result;
}
function qa_upload_file_one($maxfilesize=null, $onlyimage=false, $imagemaxwidth=null, $imagemaxheight=null)
/*
In response to a file upload, move the first uploaded file into blob storage. Other parameters are as for qa_upload_file(...)
*/
{
$file=reset($_FILES);
return qa_upload_file($file['tmp_name'], $file['name'], $maxfilesize, $onlyimage, $imagemaxwidth, $imagemaxheight);
}
/*
Omit PHP closing tag to help avoid accidental output
*/