MediaWiki 1.7.1 wiederhergestellt

1 files changed, 92 insertions, 0 deletions

diff --git a/includes/LinkFilter.php b/includes/LinkFilter.php
new file mode 100644
index 00000000..e03b59dd
--- /dev/null
+++ b/includes/LinkFilter.php
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+<?php
+
+/**
+ * Some functions to help implement an external link filter for spam control.
+ * 
+ * TODO: implement the filter. Currently these are just some functions to help
+ * maintenance/cleanupSpam.php remove links to a single specified domain. The
+ * next thing is to implement functions for checking a given page against a big
+ * list of domains.
+ *
+ * Another cool thing to do would be a web interface for fast spam removal.
+ */
+class LinkFilter {
+	/**
+	 * @static
+	 */
+	function matchEntry( $text, $filterEntry ) {
+		$regex = LinkFilter::makeRegex( $filterEntry );
+		return preg_match( $regex, $text );
+	}
+
+	/**
+	 * @static
+	 */
+	function makeRegex( $filterEntry ) {
+		$regex = '!http://';
+		if ( substr( $filterEntry, 0, 2 ) == '*.' ) {
+			$regex .= '([A-Za-z0-9.-]+\.|)';
+			$filterEntry = substr( $filterEntry, 2 );
+		}
+		$regex .= preg_quote( $filterEntry, '!' ) . '!Si';
+		return $regex;
+	}
+
+	/**
+	 * Make a string to go after an SQL LIKE, which will match the specified
+	 * string. There are several kinds of filter entry:
+	 *     *.domain.com    -  Produces http://com.domain.%, matches domain.com
+	 *                        and www.domain.com
+	 *     domain.com      -  Produces http://com.domain./%, matches domain.com
+	 *                        or domain.com/ but not www.domain.com
+	 *     *.domain.com/x  -  Produces http://com.domain.%/x%, matches
+	 *                        www.domain.com/xy
+	 *     domain.com/x    -  Produces http://com.domain./x%, matches
+	 *                        domain.com/xy but not www.domain.com/xy
+	 *
+	 * Asterisks in any other location are considered invalid.
+	 * 
+	 * @static
+	 */
+	function makeLike( $filterEntry ) {
+		if ( substr( $filterEntry, 0, 2 ) == '*.' ) {
+			$subdomains = true;
+			$filterEntry = substr( $filterEntry, 2 );
+			if ( $filterEntry == '' ) {
+				// We don't want to make a clause that will match everything,
+				// that could be dangerous
+				return false;
+			}
+		} else {
+			$subdomains = false;
+		}
+		// No stray asterisks, that could cause confusion
+		// It's not simple or efficient to handle it properly so we don't
+		// handle it at all.
+		if ( strpos( $filterEntry, '*' ) !== false ) {
+			return false;
+		}
+		$slash = strpos( $filterEntry, '/' );
+		if ( $slash !== false ) {
+			$path = substr( $filterEntry, $slash );
+			$host = substr( $filterEntry, 0, $slash );
+		} else {
+			$path = '/';
+			$host = $filterEntry;
+		}
+		$host = strtolower( implode( '.', array_reverse( explode( '.', $host ) ) ) );
+		if ( substr( $host, -1, 1 ) !== '.' ) {
+			$host .= '.';
+		}
+		$like = "http://$host";
+		
+		if ( $subdomains ) {
+			$like .= '%';
+		}
+		if ( !$subdomains || $path !== '/' ) {
+			$like .= $path . '%';
+		}
+		return $like;
+	}
+}
+?>