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600 lines
20 KiB
600 lines
20 KiB
<?php
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namespace XRay\Formats;
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use HTMLPurifier, HTMLPurifier_Config;
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use Parse;
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class Mf2 {
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public static function parse($mf2, $url, $http) {
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if(count($mf2['items']) == 0)
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return false;
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// If there is only one item on the page, just use that
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if(count($mf2['items']) == 1) {
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$item = $mf2['items'][0];
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if(in_array('h-entry', $item['type']) || in_array('h-cite', $item['type'])) {
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Parse::debug("mf2:0: Recognized $url as an h-entry it is the only item on the page");
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return self::parseAsHEntry($mf2, $item, $http);
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}
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if(in_array('h-event', $item['type'])) {
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Parse::debug("mf2:0: Recognized $url as an h-event it is the only item on the page");
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return self::parseAsHEvent($mf2, $item, $http);
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}
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}
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// Check if the list of items is a bunch of h-entrys and return as a feed
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// Unless this page's URL matches one of the entries, then treat it as a permalink
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$hentrys = 0;
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$lastSeenEntry = false;
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foreach($mf2['items'] as $item) {
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if(in_array('h-entry', $item['type']) || in_array('h-cite', $item['type'])) {
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if(array_key_exists('url', $item['properties'])) {
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$urls = $item['properties']['url'];
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$urls = array_map('self::normalize_url', $urls);
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if(in_array($url, $urls)) {
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Parse::debug("mf2:1: Recognized $url as an h-entry because an h-entry on the page matched the URL of the request");
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return self::parseAsHEntry($mf2, $item, $http);
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}
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$lastSeenEntry = $item;
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}
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$hentrys++;
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}
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}
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// If there was more than one h-entry on the page, treat the whole page as a feed
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if($hentrys > 1) {
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Parse::debug("mf2:2: Recognized $url as an h-feed because there are more than one h-entry on the page");
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return self::parseAsHFeed($mf2, $http);
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}
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// If the first item is an h-feed, parse as a feed
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$first = $mf2['items'][0];
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if(in_array('h-feed', $first['type'])) {
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Parse::debug("mf2:3: Recognized $url as an h-feed because the first item is an h-feed");
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return self::parseAsHFeed($mf2, $http);
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}
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// Check each top-level h-card and h-event, and if there is one that matches this URL, the page is an h-card
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foreach($mf2['items'] as $item) {
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if((in_array('h-card', $item['type']) or in_array('h-event', $item['type']))
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and array_key_exists('url', $item['properties'])
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) {
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$urls = $item['properties']['url'];
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$urls = array_map('self::normalize_url', $urls);
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if(in_array($url, $urls)) {
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// TODO: check for children h-entrys (like tantek.com), or sibling h-entries (like aaronparecki.com)
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// and return the result as a feed instead
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if(in_array('h-card', $item['type'])) {
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Parse::debug("mf2:4: Recognized $url as an h-card because an h-card on the page matched the URL of the request");
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return self::parseAsHCard($item, $http, $url);
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} else {
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Parse::debug("mf2:4: Recognized $url as an h-event because an h-event on the page matched the URL of the request");
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return self::parseAsHEvent($mf2, $item, $http);
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}
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}
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}
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}
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// If there was only one h-entry, but the URL for it is not the same as this page, then treat as a feed
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if($hentrys == 1) {
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if($lastSeenEntry) {
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$urls = $lastSeenEntry['properties']['url'];
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$urls = array_map('self::normalize_url', $urls);
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if(count($urls) && !in_array($url, $urls)) {
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Parse::debug("mf2:5: Recognized $url as an h-feed no h-entrys on the page matched the URL of the request");
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return self::parseAsHFeed($mf2, $http);
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}
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}
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}
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// Fallback case, but hopefully we have found something before this point
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foreach($mf2['items'] as $item) {
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// Otherwise check for an h-entry
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if(in_array('h-entry', $item['type']) || in_array('h-cite', $item['type'])) {
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Parse::debug("mf2:6: $url is falling back to the first h-entry on the page");
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return self::parseAsHEntry($mf2, $item, $http);
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}
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}
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Parse::debug("mf2:E: No object at $url was recognized");
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return false;
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}
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private static function parseAsHEntry($mf2, $item, $http) {
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$data = [
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'type' => 'entry'
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];
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$refs = [];
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// Single plaintext values
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$properties = ['url','published','summary','rsvp'];
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foreach($properties as $p) {
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if(($v = self::getPlaintext($item, $p)) !== null) {
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if($p == 'url') {
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if(self::isURL($v))
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$data[$p] = $v;
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} else {
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$data[$p] = $v;
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}
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}
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}
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// Always arrays
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$properties = ['photo','video','audio','syndication'];
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foreach($properties as $p) {
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if(array_key_exists($p, $item['properties'])) {
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foreach($item['properties'][$p] as $v) {
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if(is_string($v) && self::isURL($v)) {
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if(!array_key_exists($p, $data)) $data[$p] = [];
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$data[$p][] = $v;
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}
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elseif(is_array($v) and array_key_exists('value', $v) && self::isURL($v['value'])) {
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if(!array_key_exists($p, $data)) $data[$p] = [];
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$data[$p][] = $v['value'];
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}
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}
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}
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}
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// Always returned as arrays, and may also create external references
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// If these are not objects, they must be URLs
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$set = [
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'normal' => ['category','invitee'],
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'url' => ['in-reply-to','like-of','repost-of','bookmark-of']
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];
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foreach($set as $type=>$properties) {
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foreach($properties as $p) {
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if(array_key_exists($p, $item['properties'])) {
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foreach($item['properties'][$p] as $v) {
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if(is_string($v) && ($type == 'normal' || self::isURL($v))) {
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if(!array_key_exists($p, $data)) $data[$p] = [];
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$data[$p][] = $v;
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}
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elseif(self::isMicroformat($v) && ($u=self::getPlaintext($v, 'url')) && self::isURL($u)) {
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if(!array_key_exists($p, $data)) $data[$p] = [];
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$data[$p][] = $u;
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// parse the object and put the result in the "refs" object
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$ref = self::parse(['items'=>[$v]], $u, $http);
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if($ref) {
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$refs[$u] = $ref['data'];
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}
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}
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}
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}
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}
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}
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// Determine if the name is distinct from the content
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$name = self::getPlaintext($item, 'name');
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$content = null;
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$textContent = null;
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$htmlContent = null;
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if(array_key_exists('content', $item['properties'])) {
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$content = $item['properties']['content'][0];
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if(is_string($content)) {
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$textContent = $content;
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} elseif(!is_string($content) && is_array($content) && array_key_exists('value', $content)) {
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if(array_key_exists('html', $content)) {
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$htmlContent = trim(self::sanitizeHTML($content['html']));
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$textContent = trim(str_replace("
","\r",strip_tags($htmlContent)));
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$textContent = trim(str_replace("
","\r",$content['value']));
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} else {
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$textContent = trim($content['value']);
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}
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}
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// Trim ellipses from the name
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$name = preg_replace('/ ?(\.\.\.|…)$/', '', $name);
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// Remove all whitespace when checking equality
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$nameCompare = preg_replace('/\s/','',trim($name));
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$contentCompare = preg_replace('/\s/','',trim($textContent));
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// Check if the name is a prefix of the content
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if($contentCompare && $nameCompare && strpos($contentCompare, $nameCompare) === 0) {
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$name = null;
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}
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}
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if($name) {
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$data['name'] = $name;
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}
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// If there is content, always return the plaintext content, and return HTML content if it's different
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if($content) {
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$data['content'] = [
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'text' => $textContent
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];
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if($htmlContent && $textContent != $htmlContent) {
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$data['content']['html'] = $htmlContent;
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}
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// TODO: If no HTML content was included in the post, create HTML by autolinking?
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}
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if($author = self::findAuthor($mf2, $item, $http))
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$data['author'] = $author;
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$response = [
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'data' => $data
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];
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if(count($refs)) {
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$response['refs'] = $refs;
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}
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return $response;
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}
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private static function parseAsHEvent($mf2, $item, $http) {
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$data = [
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'type' => 'event'
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];
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$refs = [];
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// Single plaintext values
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$properties = ['name','summary','url','published','start','end','duration'];
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foreach($properties as $p) {
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if(($v = self::getPlaintext($item, $p)) !== null) {
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if($p == 'url') {
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if(self::isURL($v))
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$data[$p] = $v;
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} else {
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$data[$p] = $v;
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}
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}
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}
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// Always arrays
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$properties = ['photo','video','audio','syndication'];
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foreach($properties as $p) {
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if(array_key_exists($p, $item['properties'])) {
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foreach($item['properties'][$p] as $v) {
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if(is_string($v) && self::isURL($v)) {
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if(!array_key_exists($p, $data)) $data[$p] = [];
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$data[$p][] = $v;
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}
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elseif(is_array($v) and array_key_exists('value', $v) && self::isURL($v['value'])) {
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if(!array_key_exists($p, $data)) $data[$p] = [];
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$data[$p][] = $v['value'];
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}
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}
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}
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}
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// Always returned as arrays, and may also create external references
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$properties = ['category','location','attendee'];
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foreach($properties as $p) {
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if(array_key_exists($p, $item['properties'])) {
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$data[$p] = [];
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foreach($item['properties'][$p] as $v) {
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if(is_string($v))
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$data[$p][] = $v;
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elseif(self::isMicroformat($v) && ($u=self::getPlaintext($v, 'url')) && self::isURL($u)) {
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$data[$p][] = $u;
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// parse the object and put the result in the "refs" object
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$ref = self::parse(['items'=>[$v]], $u, $http);
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if($ref) {
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$refs[$u] = $ref['data'];
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}
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}
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}
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}
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}
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// If there is a description, always return the plaintext description, and return HTML description if it's different
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$textDescription = null;
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$htmlDescription = null;
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if(array_key_exists('description', $item['properties'])) {
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$description = $item['properties']['description'][0];
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if(is_string($description)) {
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$textDescription = $description;
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} elseif(!is_string($description) && is_array($description) && array_key_exists('value', $description)) {
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if(array_key_exists('html', $description)) {
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$htmlDescription = trim(self::sanitizeHTML($description['html']));
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$textDescription = trim(str_replace("
","\r",strip_tags($htmlDescription)));
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$textDescription = trim(str_replace("
","\r",$description['value']));
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} else {
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$textDescription = trim($description['value']);
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}
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}
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}
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if($textDescription) {
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$data['description'] = [
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'text' => $textDescription
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];
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if($htmlDescription && $textDescription != $htmlDescription) {
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$data['description']['html'] = $htmlDescription;
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}
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}
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$response = [
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'data' => $data
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];
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if(count($refs)) {
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$response['refs'] = $refs;
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}
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return $response;
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}
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private static function parseAsHFeed($mf2, $http) {
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$data = [
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'type' => 'feed',
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'author' => [
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'type' => 'card',
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'name' => null,
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'url' => null,
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'photo' => null
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],
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'todo' => 'Not yet implemented. Please see https://github.com/aaronpk/XRay/issues/1'
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];
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return [
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'data' => $data,
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'entries' => []
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];
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}
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private static function parseAsHCard($item, $http, $authorURL=false) {
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$data = [
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'type' => 'card',
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'name' => null,
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'url' => null,
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'photo' => null
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];
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$properties = ['url','name','photo'];
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foreach($properties as $p) {
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if($p == 'url' && $authorURL) {
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// If there is a matching author URL, use that one
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$found = false;
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foreach($item['properties']['url'] as $url) {
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if(self::isURL($url)) {
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$url = self::normalize_url($url);
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if($url == $authorURL) {
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$data['url'] = $url;
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$found = true;
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}
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}
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}
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if(!$found && self::isURL($item['properties']['url'][0])) {
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$data['url'] = $item['properties']['url'][0];
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}
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} else if(($v = self::getPlaintext($item, $p)) !== null) {
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// Make sure the URL property is actually a URL
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if($p == 'url' || $p == 'photo') {
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if(self::isURL($v))
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$data[$p] = $v;
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} else {
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$data[$p] = $v;
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}
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}
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}
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$response = [
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'data' => $data
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];
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return $response;
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}
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private static function findAuthor($mf2, $item, $http) {
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$author = [
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'type' => 'card',
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'name' => null,
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'url' => null,
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'photo' => null
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];
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// Author Discovery
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// http://indiewebcamp.com/authorship
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$authorPage = false;
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if(array_key_exists('author', $item['properties'])) {
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// Check if any of the values of the author property are an h-card
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foreach($item['properties']['author'] as $a) {
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if(self::isHCard($a)) {
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// 5.1 "if it has an h-card, use it, exit."
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return self::parseAsHCard($a, $http)['data'];
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} elseif(is_string($a)) {
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if(self::isURL($a)) {
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// 5.2 "otherwise if author property is an http(s) URL, let the author-page have that URL"
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$authorPage = $a;
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} else {
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// 5.3 "otherwise use the author property as the author name, exit"
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// We can only set the name, no h-card or URL was found
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$author['name'] = self::getPlaintext($item, 'author');
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return $author;
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}
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} else {
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// This case is only hit when the author property is an mf2 object that is not an h-card
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$author['name'] = self::getPlaintext($item, 'author');
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return $author;
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}
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}
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}
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// 6. "if no author page was found" ... check for rel-author link
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if(!$authorPage) {
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if(isset($mf2['rels']) && isset($mf2['rels']['author']))
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$authorPage = $mf2['rels']['author'][0];
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}
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// 7. "if there is an author-page URL" ...
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if($authorPage) {
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// 7.1 "get the author-page from that URL and parse it for microformats2"
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$authorPageContents = self::getURL($authorPage, $http);
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if($authorPageContents) {
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foreach($authorPageContents['items'] as $i) {
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if(self::isHCard($i)) {
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// 7.2 "if author-page has 1+ h-card with url == uid == author-page's URL, then use first such h-card, exit."
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if(array_key_exists('url', $i['properties'])
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and in_array($authorPage, $i['properties']['url'])
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and array_key_exists('uid', $i['properties'])
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and in_array($authorPage, $i['properties']['uid'])
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) {
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return self::parseAsHCard($i, $http, $authorPage)['data'];
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}
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// 7.3 "else if author-page has 1+ h-card with url property which matches the href of a rel-me link on the author-page"
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$relMeLinks = (isset($authorPageContents['rels']) && isset($authorPageContents['rels']['me'])) ? $authorPageContents['rels']['me'] : [];
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if(count($relMeLinks) > 0
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and array_key_exists('url', $i['properties'])
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and count(array_intersect($i['properties']['url'], $relMeLinks)) > 0
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) {
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return self::parseAsHCard($i, $http, $authorPage)['data'];
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}
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}
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}
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}
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// 7.4 "if the h-entry's page has 1+ h-card with url == author-page URL, use first such h-card, exit."
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foreach($mf2['items'] as $i) {
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if(self::isHCard($i)) {
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if(array_key_exists('url', $i['properties'])
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and in_array($authorPage, $i['properties']['url'])
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) {
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return self::parseAsHCard($i, $http)['data'];
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}
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}
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}
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}
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if(!$author['name'] && !$author['photo'] && !$author['url'])
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return null;
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return $author;
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}
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private static function sanitizeHTML($html) {
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$config = HTMLPurifier_Config::createDefault();
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$config->set('Cache.DefinitionImpl', null);
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$config->set('HTML.AllowedElements', [
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'a',
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'abbr',
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'b',
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|
'code',
|
|
'del',
|
|
'em',
|
|
'i',
|
|
'img',
|
|
'q',
|
|
'strike',
|
|
'strong',
|
|
'time',
|
|
'blockquote',
|
|
'pre',
|
|
'p',
|
|
'h1',
|
|
'h2',
|
|
'h3',
|
|
'h4',
|
|
'h5',
|
|
'h6',
|
|
'ul',
|
|
'li',
|
|
'ol'
|
|
]);
|
|
$def = $config->getHTMLDefinition(true);
|
|
$def->addElement(
|
|
'time',
|
|
'Inline',
|
|
'Inline',
|
|
'Common',
|
|
[
|
|
'datetime' => 'Text'
|
|
]
|
|
);
|
|
// Override the allowed classes to only support Microformats2 classes
|
|
$def->manager->attrTypes->set('Class', new HTMLPurifier_AttrDef_HTML_Microformats2());
|
|
$purifier = new HTMLPurifier($config);
|
|
$sanitized = $purifier->purify($html);
|
|
$sanitized = str_replace("
","\r",$sanitized);
|
|
return $sanitized;
|
|
}
|
|
|
|
private static function hasNumericKeys(array $arr) {
|
|
foreach($arr as $key=>$val)
|
|
if (is_numeric($key))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
private static function isMicroformat($mf) {
|
|
return is_array($mf)
|
|
and !self::hasNumericKeys($mf)
|
|
and !empty($mf['type'])
|
|
and isset($mf['properties']);
|
|
}
|
|
|
|
private static function isHCard($mf) {
|
|
return is_array($mf)
|
|
and !empty($mf['type'])
|
|
and is_array($mf['type'])
|
|
and in_array('h-card', $mf['type']);
|
|
}
|
|
|
|
private static function isURL($string) {
|
|
return preg_match('/^https?:\/\/.+\..+$/', $string);
|
|
}
|
|
|
|
// Given an array of microformats properties and a key name, return the plaintext value
|
|
// at that property
|
|
// e.g.
|
|
// {"properties":{"published":["foo"]}} results in "foo"
|
|
private static function getPlaintext($mf2, $k, $fallback=null) {
|
|
if(!empty($mf2['properties'][$k]) and is_array($mf2['properties'][$k])) {
|
|
// $mf2['properties'][$v] will always be an array since the input was from the mf2 parser
|
|
$value = $mf2['properties'][$k][0];
|
|
if(is_string($value)) {
|
|
return $value;
|
|
} elseif(self::isMicroformat($value) && array_key_exists('value', $value)) {
|
|
return $value['value'];
|
|
}
|
|
}
|
|
return $fallback;
|
|
}
|
|
|
|
private static function getURL($url, $http) {
|
|
if(!$url) return null;
|
|
// TODO: consider adding caching here
|
|
$result = $http->get($url);
|
|
if($result['error'] || !$result['body']) {
|
|
return null;
|
|
}
|
|
return \mf2\Parse($result['body'], $url);
|
|
}
|
|
|
|
private static function normalize_url($url) {
|
|
$parts = parse_url($url);
|
|
if(empty($parts['path']))
|
|
$parts['path'] = '/';
|
|
$parts['host'] = strtolower($parts['host']);
|
|
return self::build_url($parts);
|
|
}
|
|
|
|
private static function build_url($parsed_url) {
|
|
$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
|
|
$host = isset($parsed_url['host']) ? $parsed_url['host'] : '';
|
|
$port = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
|
|
$user = isset($parsed_url['user']) ? $parsed_url['user'] : '';
|
|
$pass = isset($parsed_url['pass']) ? ':' . $parsed_url['pass'] : '';
|
|
$pass = ($user || $pass) ? "$pass@" : '';
|
|
$path = isset($parsed_url['path']) ? $parsed_url['path'] : '';
|
|
$query = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
|
|
$fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
|
|
return "$scheme$user$pass$host$port$path$query$fragment";
|
|
}
|
|
}
|