diff options
| -rwxr-xr-x | include/items.php | 116 |
1 files changed, 112 insertions, 4 deletions
diff --git a/include/items.php b/include/items.php index cf903ac13..2cd0e6107 100755 --- a/include/items.php +++ b/include/items.php @@ -278,7 +278,116 @@ 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 |