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add function to exclude embedded images when checking message length

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Zach Prezkuta 2012-07-06 17:09:23 -06:00
parent 0c5af9f303
commit 57635e7684
1 changed files with 112 additions and 4 deletions
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114
include/items.php
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@ -280,6 +280,115 @@ function construct_activity_target($item) {
return '';
}
/* limit_body_size()
*
* The purpose of this function is to apply system message length limits to
* imported messages without including any embedded photos in the length
*
* How it works (other than when the body length is less than the max length at the outset):
* 1. When the text length without embedded images is less than the max length
* a. The while() loop does run, since there are embedded images
* b.
*
* 2. When the text length exceeds the max length before the first embedded image
*
* 3. When the text length exceeds the max length in between embedded images
*
* 4. When the text length exceeds the max length after the last embedded image
*
* 5. When there are no embedded images
*/
if(! function_exists('limit_body_size')) {
function limit_body_size($body) {
logger('limit_body_size: start', LOGGER_DEBUG);
$maxlen = get_max_import_size();
// If the length of the body, including the embedded images, is smaller
// than the maximum, then don't waste processing looking for the images
if($maxlen && (strlen($body) > $maxlen)) {
logger('limit_body_size: the body length exceeds the limit', LOGGER_DEBUG);
$img_pos = array();
$max_pos = 0;
$body_left = $body;
$cnt = 0;
$img_pos[$cnt] = array('start' => strpos($body_left, '[img]data:'));
while($img_pos[$cnt]['start'] !== false) {
// We're assuming that at this point, every opening '[img]data:' tag has a closing [/img] tag
$img_pos[$cnt]['end'] = strpos(substr($body_left, $img_pos[$cnt]['start'], strlen($body_left) - $img_pos[$cnt]['start']), '[/img]');
$img_pos[$cnt]['end'] += strlen('[/img]');
$img_pos[$cnt]['end'] += $img_pos[$cnt]['start'];
if(! $cnt) {
// This code should only run in the first loop
$textlen = $img_pos[$cnt]['start'];
if( ($maxlen - $textlen) <= 0 ) {
$maxpos = $maxlen;
$maxcnt = $cnt;
}
}
else {
$newlen = $img_pos[$cnt]['start'] - $img_pos[$cnt - 1]['end']; // The length between the last embedded image and the next
if( (! $max_pos) && (($maxlen - ($textlen + $newlen)) <= 0) ) {
// $max_pos should be 0 until the message text exceeds the limit.
// If the limit has already been set, don't set it again
$len_left = $maxlen - $textlen;
$maxpos = $img_pos[$cnt - 1]['end'] + $len_left; // We'll cut off the text at this position
$maxcnt = $cnt;
}
$textlen += $newlen;
}
$body_left = substr($body_left, $img_pos[$cnt]['end'], strlen($body_left) - $img_pos[$cnt]['end']);
$cnt++;
$img_pos[$cnt] = array('start' => strpos($body_left, '[img]data:') + $img_pos[$cnt - 1]['end']);
}
logger('limit_body_size: the while loop ran ' . $cnt . ' times', LOGGER_DEBUG);
if(! $cnt) {
// The while() loop never ran -- there are no embedded images
$maxpos = $maxlen;
$maxcnt = $cnt;
$textlen = strlen($body);
}
else {
// The while() loop did run. But the end of the last embedded image may not be the end of the body
// Check if the maximum length occurs between the end of the last embedded image and the end of the text
$newlen = strlen($body_left);
if( (! $max_pos) && (($maxlen - ($textlen + $newlen)) <= 0) ) {
$len_left = $maxlen - $textlen;
$maxpos = $img_pos[$cnt - 1]['end'] + $len_left; // We'll cut off the text at this position
$maxcnt = $cnt;
}
$textlen += $newlen;
}
if($textlen > $maxlen) {
$newbody = substr($body, 0, $maxpos); // Note: $maxpos is the position of the character AFTER the maximum length
// Now pile all the remaining embedded images onto the end
for($i = $maxcnt; $i < $cnt; $i++)
$newbody = $newbody . substr($body, $img_pos[$i]['start'], $img_pos[$i]['end'] - $img_pos[$i]['start']);
logger('limit_body_size: the text length (w/o embedded images) was ' . $textlen . ' and the limit was ' . $maxlen . '. Body truncated', LOGGER_DEBUG);
return $newbody;
}
else // When embedded images are excluded, the text length is less than the maximum, so we're good
return $body;
}
else
return $body;
}}
@ -414,9 +523,8 @@ function get_atom_elements($feed,$item) {
$res['body'] = notags(base64url_decode($res['body']));
}
$maxlen = get_max_import_size();
if($maxlen && (strlen($res['body']) > $maxlen))
$res['body'] = substr($res['body'],0, $maxlen);
$res['body'] = limit_body_size($res['body']);
// It isn't certain at this point whether our content is plaintext or html and we'd be foolish to trust
// the content type. Our own network only emits text normally, though it might have been converted to