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429 lines
12 KiB
429 lines
12 KiB
<?php
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namespace XRay\Formats;
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use HTMLPurifier, HTMLPurifier_Config;
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class Mf2 {
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public static function parse($mf2, $url, $http) {
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// TODO: Check if the list of items is a bunch of h-entrys and return as a feed
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if($item = $mf2['items'][0]) {
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// If the first item is a feed, the page is a feed
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if(in_array('h-feed', $item['type'])) {
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return self::parseAsHFeed($mf2, $http);
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}
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// Check each top-level h-card, and if there is one that matches this URL, the page is an h-card
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foreach($mf2['items'] as $i) {
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if(in_array('h-card', $i['type'])
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and array_key_exists('url', $i['properties'])
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) {
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$urls = $i['properties']['url'];
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$urls = array_map('\normalize_url', $urls);
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if(in_array($url, $urls)) {
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// TODO: check for children h-entrys (like tantek.com), or sibling h-entries (like aaronparecki.com)
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// and return the result as a feed instead
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return self::parseAsHCard($i, $http, $url);
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}
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}
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}
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}
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foreach($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', $item['type'])) {
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return self::parseAsHEntry($mf2, $http);
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}
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}
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return false;
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}
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private static function parseAsHEntry($mf2, $http) {
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$data = [
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'type' => 'entry'
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];
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$refs = [];
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// Find the first h-entry
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foreach($mf2['items'] as $i) {
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if(in_array('h-entry', $i['type']) || in_array('h-cite', $i['type'])) {
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$item = $i;
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continue;
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}
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}
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// Single plaintext values
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$properties = ['url','published','summary','rsvp'];
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foreach($properties as $p) {
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if($v = self::getPlaintext($item, $p))
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$data[$p] = $v;
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}
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// Always arrays
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$properties = ['photo','video','syndication'];
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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][] = $v;
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elseif(is_array($v) and array_key_exists('value', $v))
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$data[$p][] = $v['value'];
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}
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}
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}
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// Always returned as arrays, and may also create external references
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$properties = ['in-reply-to','like-of','repost-of','category'];
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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'))) {
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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] = $ref['data'];
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}
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}
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}
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}
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}
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// Determine if the name is distinct from the content
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$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'] = $name;
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}
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if($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'] = $htmlContent;
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}
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}
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if($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 $response;
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}
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private static function parseAsHFeed($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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'items' => [],
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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' => $data
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];
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}
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private static function parseAsHCard($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 $url) {
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$url = \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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if(!$found) $data['url'] = $item['properties']['url'][0];
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} else if($v = self::getPlaintext($item, $p)) {
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$data[$p] = $v;
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}
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}
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$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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$config->set('HTML.AllowedElements', [
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'a',
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'abbr',
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'b',
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'code',
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'del',
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'em',
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'i',
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'img',
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'q',
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'strike',
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'strong',
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'time',
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'blockquote',
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'pre',
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'p',
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'h1',
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'h2',
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'h3',
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'h4',
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'h5',
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'h6',
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'ul',
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'li',
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'ol'
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]);
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$def = $config->getHTMLDefinition(true);
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$def->addElement(
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'time',
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'Inline',
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'Inline',
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'Common',
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[
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'datetime' => 'Text'
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]
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);
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// Override the allowed classes to only support Microformats2 classes
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$def->manager->attrTypes->set('Class', new \HTMLPurifier_AttrDef_HTML_Microformats2());
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$purifier = new HTMLPurifier($config);
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return $purifier->purify($html);
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}
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private static function responseDisplayText($name, $summary, $content) {
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// Build a fake h-entry to pass to the comments parser
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$input = [
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'type' => ['h-entry'],
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'properties' => [
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'name' => [trim($name)],
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'summary' => [trim($summary)],
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'content' => [trim($content)]
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]
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];
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if(!trim($name))
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unset($input['properties']['name']);
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if(!trim($summary))
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unset($input['properties']['summary']);
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$result = \IndieWeb\comments\parse($input, false, 1024, 4);
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return [
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'name' => trim($result['name']),
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'content' => $result['text']
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];
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}
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private static function hasNumericKeys(array $arr) {
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foreach($arr as $key=>$val)
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if (is_numeric($key))
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return true;
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return false;
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}
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private static function isMicroformat($mf) {
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return is_array($mf)
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and !self::hasNumericKeys($mf)
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and !empty($mf['type'])
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and isset($mf['properties']);
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}
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private static function isHCard($mf) {
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return is_array($mf)
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and !empty($mf['type'])
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and is_array($mf['type'])
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and in_array('h-card', $mf['type']);
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}
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private static function isURL($string) {
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return preg_match('/^https?:\/\/.+\..+$/', $string);
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}
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// Given an array of microformats properties and a key name, return the plaintext value
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// at that property
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// e.g.
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// {"properties":{"published":["foo"]}} results in "foo"
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private static function getPlaintext($mf2, $k, $fallback=null) {
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if(!empty($mf2['properties'][$k]) and is_array($mf2['properties'][$k])) {
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// $mf2['properties'][$v] will always be an array since the input was from the mf2 parser
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$value = $mf2['properties'][$k][0];
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if(is_string($value)) {
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return $value;
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} elseif(self::isMicroformat($value) && array_key_exists('value', $value)) {
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return $value['value'];
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}
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}
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return $fallback;
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}
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private static function getURL($url, $http) {
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if(!$url) return null;
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// TODO: consider adding caching here
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$result = $http->get($url);
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if($result['error'] || !$result['body']) {
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return null;
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}
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return \mf2\Parse($result['body'], $url);
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}
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}
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