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101 lines
2.7 KiB
PHP
101 lines
2.7 KiB
PHP
<?
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/**
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* This class determines the thumbnail equivalent of an image's url after being passed the original
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*
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**/
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$blacklist = array("tinypic", "dsimg");
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/**
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* Checks if image host is good, otherwise displays an error.
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*/
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function check_imagehost($url) {
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global $blacklist;
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foreach ($blacklist as &$value) {
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if(strpos(strtolower($url), $value)) {
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$parsed_url = parse_url($url);
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error($parsed_url['host'] . " is not an allowed imagehost. Please use a different imagehost.");
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break;
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}
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}
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}
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/**
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* The main function, called to get the thumbnail url.
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*/
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function to_thumbnail($url) {
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$thumb = $url;
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$extension = pathinfo($url, PATHINFO_EXTENSION);
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if (contains('whatimg', $url)) {
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if (hasWhatImgThumb($url)) {
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if ($extension == 'jpeg') {
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$thumb = replace_extension($url, '_thumb.jpeg');
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}
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if ($extension == 'jpg') {
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$thumb = replace_extension($url, '_thumb.jpg');
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}
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if ($extension == 'png') {
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$thumb = replace_extension($url, '_thumb.png');
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}
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if ($extension == 'gif') {
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$thumb = replace_extension($url, '_thumb.gif');
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}
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}
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} elseif (contains('imgur', $url)) {
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$url = cleanImgurUrl($url);
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if ($extension == 'jpeg') {
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$thumb = replace_extension($url, 'm.jpeg');
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}
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if ($extension == 'jpg') {
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$thumb = replace_extension($url, 'm.jpg');
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}
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if ($extension == 'png') {
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$thumb = replace_extension($url, 'm.png');
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}
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if ($extension == 'gif') {
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$thumb = replace_extension($url, 'm.gif');
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}
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}
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return $thumb;
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}
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/**
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* Replaces the extension.
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*/
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function replace_extension($string, $extension) {
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$string = preg_replace('/\.[^.]*$/', '', $string);
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$string = $string . $extension;
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return $string;
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}
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function contains($substring, $string) {
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return $pos = strpos($string, $substring);
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}
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/**
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* Checks if url points to a whatimg thumbnail.
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*/
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function hasWhatImgThumb($url) {
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return !contains("_thumb", $url);
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}
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/**
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* Cleans up imgur url if it already has a modifier attached to the end of it.
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*/
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function cleanImgurUrl($url) {
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$extension = pathinfo($url, PATHINFO_EXTENSION);
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$full = preg_replace('/\.[^.]*$/', '', $url);
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$base = substr($full, 0, strrpos($full, '/'));
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$path = substr($full, strrpos($full, '/') + 1);
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if (strlen($path) == 6) {
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$last = $path[strlen($path) - 1];
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if ($last == 'm' || $last == 'l' || $last == 's' || $last == 'h' || $last == 'b') {
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$path = substr($path, 0, -1);
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}
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}
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return $base . "/" . $path . "." . $extension;
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}
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?>
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