friendica/src/Protocol/Feed.php

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<?php
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/**
* @file src/Protocol/Feed.php
* @brief Imports RSS/RDF/Atom feeds
*
*/
namespace Friendica\Protocol;
use DOMDocument;
use DOMXPath;
use Friendica\Content\Text\HTML;
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use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Item;
use Friendica\Util\Network;
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use Friendica\Util\XML;
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/**
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* @brief This class contain functions to import feeds
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*
*/
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class Feed {
/**
* @brief Read a RSS/RDF/Atom feed and create an item entry for it
*
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* @param string $xml The feed data
* @param array $importer The user record of the importer
* @param array $contact The contact record of the feed
* @param string $hub Unused dummy value for compatibility reasons
* @param bool $simulate If enabled, no data is imported
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*
* @return array In simulation mode it returns the header and the first item
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
public static function import($xml, $importer, &$contact, &$hub, $simulate = false) {
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$a = \get_app();
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if (!$simulate) {
Logger::log("Import Atom/RSS feed '".$contact["name"]."' (Contact ".$contact["id"].") for user ".$importer["uid"], Logger::DEBUG);
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} else {
Logger::log("Test Atom/RSS feed", Logger::DEBUG);
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}
if (empty($xml)) {
Logger::log('XML is empty.', Logger::DEBUG);
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return;
}
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if (!empty($contact['poll'])) {
$basepath = $contact['poll'];
} elseif (!empty($contact['url'])) {
$basepath = $contact['url'];
} else {
$basepath = '';
}
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$doc = new DOMDocument();
@$doc->loadXML(trim($xml));
$xpath = new DOMXPath($doc);
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$xpath->registerNamespace('atom', NAMESPACE_ATOM1);
$xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
$xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
$xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
$xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
$xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
$xpath->registerNamespace('poco', NAMESPACE_POCO);
$author = [];
$entries = null;
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// Is it RDF?
if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
$author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
$author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
if (empty($author["author-name"])) {
$author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
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}
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$entries = $xpath->query('/rdf:RDF/rss:item');
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}
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// Is it Atom?
if ($xpath->query('/atom:feed')->length > 0) {
$alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
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if (is_object($alternate)) {
foreach ($alternate AS $attribute) {
if ($attribute->name == "href") {
$author["author-link"] = $attribute->textContent;
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}
}
}
if (empty($author["author-link"])) {
$self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
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if (is_object($self)) {
foreach ($self AS $attribute) {
if ($attribute->name == "href") {
$author["author-link"] = $attribute->textContent;
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}
}
}
}
if (empty($author["author-link"])) {
$author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
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}
$author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
$author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
if (empty($author["author-name"])) {
$author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
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}
if (empty($author["author-name"])) {
$author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
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}
$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
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if ($value != "") {
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$author["author-name"] = $value;
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}
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if ($simulate) {
$author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
// See https://tools.ietf.org/html/rfc4287#section-3.2.2
$value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
if ($value != "") {
$author["author-link"] = $value;
}
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$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
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if ($value != "") {
$author["author-nick"] = $value;
}
$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
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if ($value != "") {
$author["author-location"] = $value;
}
$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
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if ($value != "") {
$author["author-about"] = $value;
}
$avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
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if (is_object($avatar)) {
foreach ($avatar AS $attribute) {
if ($attribute->name == "href") {
$author["author-avatar"] = $attribute->textContent;
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}
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}
}
}
$author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
$author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
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$entries = $xpath->query('/atom:feed/atom:entry');
}
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// Is it RSS?
if ($xpath->query('/rss/channel')->length > 0) {
$author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
$author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
$author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
if (empty($author["author-name"])) {
$author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
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}
if (empty($author["author-name"])) {
$author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
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}
$author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
$author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
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$entries = $xpath->query('/rss/channel/item');
}
if (!$simulate) {
$author["author-link"] = $contact["url"];
if (empty($author["author-name"])) {
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$author["author-name"] = $contact["name"];
}
$author["author-avatar"] = $contact["thumb"];
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$author["owner-link"] = $contact["url"];
$author["owner-name"] = $contact["name"];
$author["owner-avatar"] = $contact["thumb"];
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}
$header = [];
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$header["uid"] = $importer["uid"];
$header["network"] = Protocol::FEED;
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$header["wall"] = 0;
$header["origin"] = 0;
$header["gravity"] = GRAVITY_PARENT;
$header["private"] = 2;
$header["verb"] = ACTIVITY_POST;
$header["object-type"] = ACTIVITY_OBJ_NOTE;
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$header["contact-id"] = $contact["id"];
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if (!is_object($entries)) {
Logger::log("There are no entries in this feed.", Logger::DEBUG);
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return;
}
$items = [];
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// Importing older entries first
for($i = $entries->length - 1; $i >= 0;--$i) {
$entry = $entries->item($i);
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$item = array_merge($header, $author);
$alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
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if (!is_object($alternate)) {
$alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
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}
if (is_object($alternate)) {
foreach ($alternate AS $attribute) {
if ($attribute->name == "href") {
$item["plink"] = $attribute->textContent;
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}
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}
}
if (empty($item["plink"])) {
$item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
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}
if (empty($item["plink"])) {
$item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
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}
$item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
if (empty($item["uri"])) {
$item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
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}
if (empty($item["uri"])) {
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$item["uri"] = $item["plink"];
}
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$orig_plink = $item["plink"];
$item["plink"] = Network::finalUrl($item["plink"]);
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$item["parent-uri"] = $item["uri"];
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if (!$simulate) {
$condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
$importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
$previous = Item::selectFirst(['id'], $condition);
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if (DBA::isResult($previous)) {
Logger::log("Item with uri ".$item["uri"]." for user ".$importer["uid"]." already existed under id ".$previous["id"], Logger::DEBUG);
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continue;
}
}
$item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
if (empty($item["title"])) {
$item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
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}
if (empty($item["title"])) {
$item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
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}
$item["title"] = mb_convert_encoding($item["title"], 'HTML-ENTITIES', "UTF-8");
$published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
if (empty($published)) {
$published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
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}
if (empty($published)) {
$published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
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}
$updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
if (empty($updated) && !empty($published)) {
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$updated = $published;
}
if (empty($published) && !empty($updated)) {
$published = $updated;
}
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if ($published != "") {
$item["created"] = $published;
}
if ($updated != "") {
$item["edited"] = $updated;
}
$creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
if (empty($creator)) {
$creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
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}
if (empty($creator)) {
$creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
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}
if ($creator != "") {
$item["author-name"] = $creator;
}
$creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
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if ($creator != "") {
$item["author-name"] = $creator;
}
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/// @TODO ?
// <category>Ausland</category>
// <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
$attachments = [];
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$enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
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foreach ($enclosures AS $enclosure) {
$href = "";
$length = "";
$type = "";
foreach ($enclosure->attributes AS $attribute) {
if (in_array($attribute->name, ["url", "href"])) {
$href = $attribute->textContent;
} elseif ($attribute->name == "length") {
$length = $attribute->textContent;
} elseif ($attribute->name == "type") {
$type = $attribute->textContent;
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}
}
if (!empty($item["attach"])) {
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$item["attach"] .= ',';
} else {
$item["attach"] = '';
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}
$attachments[] = ["link" => $href, "type" => $type, "length" => $length];
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$item["attach"] .= '[attach]href="'.$href.'" length="'.$length.'" type="'.$type.'"[/attach]';
}
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$tags = '';
$categories = $xpath->query("category", $entry);
foreach ($categories AS $category) {
$hashtag = $category->nodeValue;
if ($tags != '') {
$tags .= ', ';
}
$taglink = "#[url=" . System::baseUrl() . "/search?tag=" . $hashtag . "]" . $hashtag . "[/url]";
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$tags .= $taglink;
}
$body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
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if (empty($body)) {
$body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
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}
$summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
if (empty($summary)) {
$summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
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}
if (empty($body)) {
$body = $summary;
$summary = '';
}
if ($body == $summary) {
$summary = '';
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}
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// remove the content of the title if it is identically to the body
// This helps with auto generated titles e.g. from tumblr
if (self::titleIsBody($item["title"], $body)) {
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$item["title"] = "";
}
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$item["body"] = HTML::toBBCode($body, $basepath);
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if (($item["body"] == '') && ($item["title"] != '')) {
$item["body"] = $item["title"];
$item["title"] = '';
}
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$preview = '';
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if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
// Handle enclosures and treat them as preview picture
foreach ($attachments AS $attachment) {
if ($attachment["type"] == "image/jpeg") {
$preview = $attachment["link"];
}
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}
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// Remove a possible link to the item itself
$item["body"] = str_replace($item["plink"], '', $item["body"]);
$item["body"] = preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]);
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// Replace the content when the title is longer than the body
$replace = (strlen($item["title"]) > strlen($item["body"]));
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// Replace it, when there is an image in the body
if (strstr($item["body"], '[/img]')) {
$replace = true;
}
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// Replace it, when there is a link in the body
if (strstr($item["body"], '[/url]')) {
$replace = true;
}
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if ($replace) {
$item["body"] = $item["title"];
}
// We always strip the title since it will be added in the page information
$item["title"] = "";
$item["body"] = $item["body"].add_page_info($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_blacklist"]);
$item["tag"] = add_page_keywords($item["plink"], $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_blacklist"]);
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$item["object-type"] = ACTIVITY_OBJ_BOOKMARK;
unset($item["attach"]);
} else {
if (!empty($summary)) {
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$item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
}
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if ($contact["fetch_further_information"] == 3) {
if (!empty($tags)) {
$item["tag"] = $tags;
} else {
// @todo $preview is never set in this case, is it intended? - @MrPetovan 2018-02-13
$item["tag"] = add_page_keywords($item["plink"], $preview, true, $contact["ffi_keyword_blacklist"]);
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}
$item["body"] .= "\n".$item['tag'];
}
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// Add the link to the original feed entry if not present in feed
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if (($item['plink'] != '') && !strstr($item["body"], $item['plink'])) {
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$item["body"] .= "[hr][url]".$item['plink']."[/url]";
}
}
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if (!$simulate) {
Logger::log("Stored feed: ".print_r($item, true), Logger::DEBUG);
$notify = Item::isRemoteSelf($contact, $item);
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// Distributed items should have a well formatted URI.
// Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
if ($notify) {
$item['guid'] = Item::guidFromUri($orig_plink, $a->getHostName());
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unset($item['uri']);
unset($item['parent-uri']);
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// Set the delivery priority for "remote self" to "medium"
$notify = PRIORITY_MEDIUM;
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}
$id = Item::insert($item, false, $notify);
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Logger::log("Feed for contact ".$contact["url"]." stored under id ".$id);
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} else {
$items[] = $item;
}
if ($simulate) {
break;
}
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}
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if ($simulate) {
return ["header" => $author, "items" => $items];
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}
}
private static function titleIsBody($title, $body)
{
$title = strip_tags($title);
$title = trim($title);
$title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
$title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
$body = strip_tags($body);
$body = trim($body);
$body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
$body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
if (strlen($title) < strlen($body)) {
$body = substr($body, 0, strlen($title));
}
if (($title != $body) && (substr($title, -3) == "...")) {
$pos = strrpos($title, "...");
if ($pos > 0) {
$title = substr($title, 0, $pos);
$body = substr($body, 0, $pos);
}
}
return ($title == $body);
}
}