+++ /dev/null
-<?php
-
-/*
- PingBack [http://www.hixie.ch/specs/pingback/pingback] automatically
- discovers when somebody inserts a URL into a page and pings the remote
- server to take note about the mentioning of one of its articles. There
- is a lot of auto-discovery involved, and this requires XML+RPC and the
- HTTP extensions (see plugins/lib/) to be present.
- This plugin implements client and server (Wiki can itself be pinged).
-
- GOTCHAS: may only work for ordinarily named WikiPages (no non-word
- characters inside). You should prepare EWIKI_SCRIPT_URL to yield nice
- links to your pages as usual.
- If possible you should add <link rel="pingback" href=".../z.php"> to
- your site layout script.
-*/
-
-
-
-#-- plugin registration
-$wikiapi["pingback.ping"] = "ewiki_pingback_rpc";
-$ewiki_plugins["edit_save"][] = "ewiki_pingback_newurls";
-$ewiki_plugins["init"][] = "ewiki_pingback_header";
-@$ewiki_config["ua"] .= " PingBack/0.2";
-
-
-#-- server part (adding URLs to our pages) -------------------------------
-function ewiki_pingback_rpc($source_url, $target_url) {
- global $ewiki_config;
-
- #-- does the target URL refer to a known WikiPage ?
- $id = ewiki_url2id($target_url);
- if (!$id) {
- xmlrpc_send_response(xmlrpc_error(0x0021, "Could not determine PageName for the given target URL."));
- }
- if (!($data = ewiki_db::GET($id))) {
- xmlrpc_send_response(xmlrpc_error(0x0020, "The given target page does not exist."));
- }
-
-
- #-- check if the caller really has a link as he claims
- ini_set("user_agent", $ewiki_config["ua"]);
- if ((strpos($source_url, "http://")===0) && ($test = ewiki_http_asis($source_url, 96256))) {
- $test = strtolower($test);
- $test_url = strtolower($target_url);
- if (!strpos($test, $test_url)
- and !strpos($test, htmlentities($test_url))) {
- return xmlrpc_error(0x0011, "Sorry, but couldn't find a link to '$target_url' on your given '$source_url' page.");
- }
- }
- else {
- return xmlrpc_error(0x0010, "Your given source URL does not exist, could not be retrieved.");
- }
-
- #-- reject other frivolous links
- if (preg_match('#^http://[^/]+/?$#', $source_url)) {
- return xmlrpc_error(0x0011, "Rejected '$source_url' as frivolous.");
- }
- #-- check write permissions
- if ((EWIKI_DB_F_TEXT != $data["flags"] & EWIKI_DB_F_TYPE)
- or ($data["flags"] & EWIKI_DB_F_READONLY)) {
- return xmlrpc_error(0x0031, "Sorry, but this page is write-protected or not a system page.");
- }
- #-- already on page
- if (strpos($data["content"], $source_url)) {
- return xmlrpc_error(0x0030, "The given link does already exist on this page.");
- }
- #-- other go-away cases
- if (function_exists("ewiki_banned_url") && ewiki_banned_url($source_url) || function_exists("ewiki_blocked_url") && ewiki_blocked_url($source_url)) {
- return xmlrpc_error(0x0100, "Your link is unwanted here (registered on BlockedLinks or BannedLinks).");
- }
-
- #-- else update page
- $data["content"] = rtrim($data["content"])
- . "\n* $source_url (PingBack)\n";
- ewiki_db::UPDATE($data);
- $data["version"]++;
- $ok = ewiki_db::WRITE($data);
-
- #-- fin response
- if ($ok) {
- return("Link to '$source_url' was added to page '$id'.");
- }
- else {
- return xmlrpc_error(0x0101, "Seems like a database/writing error occoured.");
- }
-}
-
-
-#-- page id from absolute URL
-function ewiki_url2id($url) {
- if (strpos($url, EWIKI_SCRIPT_URL)===0) {
- $id = substr($url, strlen(EWIKI_SCRIPT_URL));
- }
- elseif ($l = strpos($url, "?id=")) {
- $id = strtok(substr($url, $l+4), "&");
- }
- elseif ($l = strpos($url, "?")) {
- $id = strtok(substr($url, $l+1), "&");
- }
- elseif (($l = strrpos($url, "/")) > 10) {
- $id = strtok(substr($url, $l+1), "?&.");
- }
- return($id);
-}
-
-
-#-- notify clients that we're also server
-function ewiki_pingback_header() {
- header("X-PingBack: " . EWIKI_BASE_URL . "z.php");
-}
-
-
-
-
-#-- client part (notify remote server of added URLs on current site) -----
-function ewiki_pingback_ping($source, $target) {
-
- #-- detect if $target URL is pingback-enabled, and go
- if ($rpc_url = ewiki_pingback_discover($target)) {
-
- $res = xmlrpc_request($rpc_url, "pingback.ping", array($source, $target));
- // we don't care about the result, do we?
- }
-}
-
-
-#-- short http request to discover X-Pingback header or <link> tag
-function ewiki_pingback_discover($url) {
- global $ewiki_config;
-
- ini_set("user_agent", $ewiki_config["ua"]);
- if ((strpos($url, "http://") === 0) && ($data = ewiki_http_asis($url, 4096))) {
- if (preg_match('/\nX-Pingback:\s*([^\s,]+)/i', $data, $uu)) {
- return($uu[1]);
- }
- elseif (preg_match('/<link[^>]+rel=["\']?pingback["\']?[^>]+href=["\']?([^>"\'\s]+)/i', $data, $uu)) {
- return($uu[1]);
- }
- }
-}
-
-
-#-- undeciphered GET request
-function ewiki_http_asis($url, $maxsize=8192) {
- global $ewiki_config;
- $c = parse_url($url);
- extract($c);
- $port = $port ? $port : 80;
- $path .= $query ? "?$query" : "";
- if ($f = fsockopen($host, $port, $errno, $errstr, $timeout=5)) {
- fwrite($f, "GET $path HTTP/1.0\r\n"
- . "Host: $host\r\n"
- . "Connection: close\r\n"
- . "Accept: text/html, application/xml, text/xml, application/xhtml+xml, text/plain\r\n"
- . "User-Agent: $ewiki_config[ua]\r\n"
- . "\r\n");
- socket_set_blocking($f, true);
- $data = false;
- while (!feof($f) && (strlen($data) < $maxsize)) {
- $data .= fread($f, $maxsize);
- }
- fclose($f);
- return($data);
- }
-}
-
-
-
-#-- check for newly added urls
-function ewiki_pingback_newurls(&$save, &$old) {
-
- global $ewiki_plugins, $ewiki_config;
-
- #-- check newly added links
- $newlinks = array_diff(explode("\n", trim($save["refs"])), explode("\n", trim($old["refs"])));
- foreach ($newlinks as $link) if (strpos($link, "://")) {
- $ewiki_config["pingback"][] = $link;
- }
- if (@$ewiki_config["pingback"]) {
- register_shutdown_function("ewiki_pingback_start");
- }
-}
-
-
-#-- registers all previously added URLs
-function ewiki_pingback_start() {
-
- global $ewiki_plugins, $ewiki_config, $ewiki_id;
- $source_url = ewiki_script_url("", $ewiki_id);
-
- foreach ($ewiki_config["pingback"] as $target_url) {
- ewiki_pingback_ping($source_url, $target_url);
- }
-}
-
-
-?>
\ No newline at end of file
projects / atutor.git / blobdiff