src/Protocol/Feed.php

   1 <?php
   2 /**
   3  * @file src/Protocol/Feed.php
   4  * @brief Imports RSS/RDF/Atom feeds
   5  *
   6  */
   7 namespace Friendica\Protocol;
   8
   9 use DOMDocument;
  10 use DOMXPath;
  11 use Friendica\Content\Text\HTML;
  12 use Friendica\Core\Logger;
  13 use Friendica\Core\Protocol;
  14 use Friendica\Core\System;
  15 use Friendica\Database\DBA;
  16 use Friendica\Model\Item;
  17 use Friendica\Protocol\ActivityNamespace;
  18 use Friendica\Util\ParseUrl;
  19 use Friendica\Util\Network;
  20 use Friendica\Util\XML;
  21
  22 /**
  23  * @brief This class contain functions to import feeds
  24  *
  25  */
  26 class Feed {
  27         /**
  28          * @brief Read a RSS/RDF/Atom feed and create an item entry for it
  29          *
  30          * @param string $xml      The feed data
  31          * @param array  $importer The user record of the importer
  32          * @param array  $contact  The contact record of the feed
  33          * @param string $hub      Unused dummy value for compatibility reasons
  34          * @param bool   $simulate If enabled, no data is imported
  35          *
  36          * @return array In simulation mode it returns the header and the first item
  37          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  38          */
  39         public static function import($xml, $importer, &$contact, &$hub, $simulate = false) {
  40
  41                 $a = \get_app();
  42
  43                 if (!$simulate) {
  44                         Logger::log("Import Atom/RSS feed '".$contact["name"]."' (Contact ".$contact["id"].") for user ".$importer["uid"], Logger::DEBUG);
  45                 } else {
  46                         Logger::log("Test Atom/RSS feed", Logger::DEBUG);
  47                 }
  48                 if (empty($xml)) {
  49                         Logger::log('XML is empty.', Logger::DEBUG);
  50                         return;
  51                 }
  52
  53                 if (!empty($contact['poll'])) {
  54                         $basepath = $contact['poll'];
  55                 } elseif (!empty($contact['url'])) {
  56                         $basepath = $contact['url'];
  57                 } else {
  58                         $basepath = '';
  59                 }
  60
  61                 $doc = new DOMDocument();
  62                 @$doc->loadXML(trim($xml));
  63                 $xpath = new DOMXPath($doc);
  64                 $xpath->registerNamespace('atom', ActivityNamespace::ATOM1);
  65                 $xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
  66                 $xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
  67                 $xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  68                 $xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
  69                 $xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
  70                 $xpath->registerNamespace('poco', ActivityNamespace::POCO);
  71
  72                 $author = [];
  73                 $entries = null;
  74
  75                 // Is it RDF?
  76                 if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
  77                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
  78                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
  79
  80                         if (empty($author["author-name"])) {
  81                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
  82                         }
  83                         $entries = $xpath->query('/rdf:RDF/rss:item');
  84                 }
  85
  86                 // Is it Atom?
  87                 if ($xpath->query('/atom:feed')->length > 0) {
  88                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
  89                         if (is_object($alternate)) {
  90                                 foreach ($alternate AS $attribute) {
  91                                         if ($attribute->name == "href") {
  92                                                 $author["author-link"] = $attribute->textContent;
  93                                         }
  94                                 }
  95                         }
  96
  97                         if (empty($author["author-link"])) {
  98                                 $self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
  99                                 if (is_object($self)) {
 100                                         foreach ($self AS $attribute) {
 101                                                 if ($attribute->name == "href") {
 102                                                         $author["author-link"] = $attribute->textContent;
 103                                                 }
 104                                         }
 105                                 }
 106                         }
 107
 108                         if (empty($author["author-link"])) {
 109                                 $author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 110                         }
 111                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 112
 113                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 114
 115                         if (empty($author["author-name"])) {
 116                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 117                         }
 118                         if (empty($author["author-name"])) {
 119                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 120                         }
 121                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 122                         if ($value != "") {
 123                                 $author["author-name"] = $value;
 124                         }
 125                         if ($simulate) {
 126                                 $author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
 127
 128                                 // See https://tools.ietf.org/html/rfc4287#section-3.2.2
 129                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
 130                                 if ($value != "") {
 131                                         $author["author-link"] = $value;
 132                                 }
 133
 134                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 135                                 if ($value != "") {
 136                                         $author["author-nick"] = $value;
 137                                 }
 138                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
 139                                 if ($value != "") {
 140                                         $author["author-location"] = $value;
 141                                 }
 142                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
 143                                 if ($value != "") {
 144                                         $author["author-about"] = $value;
 145                                 }
 146                                 $avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 147                                 if (is_object($avatar)) {
 148                                         foreach ($avatar AS $attribute) {
 149                                                 if ($attribute->name == "href") {
 150                                                         $author["author-avatar"] = $attribute->textContent;
 151                                                 }
 152                                         }
 153                                 }
 154                         }
 155
 156                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
 157
 158                         $author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
 159
 160                         $entries = $xpath->query('/atom:feed/atom:entry');
 161                 }
 162
 163                 // Is it RSS?
 164                 if ($xpath->query('/rss/channel')->length > 0) {
 165                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 166
 167                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
 168                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 169
 170                         if (empty($author["author-name"])) {
 171                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 172                         }
 173                         if (empty($author["author-name"])) {
 174                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 175                         }
 176                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 177
 178                         $author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 179
 180                         $entries = $xpath->query('/rss/channel/item');
 181                 }
 182
 183                 if (!$simulate) {
 184                         $author["author-link"] = $contact["url"];
 185
 186                         if (empty($author["author-name"])) {
 187                                 $author["author-name"] = $contact["name"];
 188                         }
 189                         $author["author-avatar"] = $contact["thumb"];
 190
 191                         $author["owner-link"] = $contact["url"];
 192                         $author["owner-name"] = $contact["name"];
 193                         $author["owner-avatar"] = $contact["thumb"];
 194                 }
 195
 196                 $header = [];
 197                 $header["uid"] = $importer["uid"];
 198                 $header["network"] = Protocol::FEED;
 199                 $header["wall"] = 0;
 200                 $header["origin"] = 0;
 201                 $header["gravity"] = GRAVITY_PARENT;
 202                 $header["private"] = 2;
 203                 $header["verb"] = Activity::POST;
 204                 $header["object-type"] = Activity\ObjectType::NOTE;
 205
 206                 $header["contact-id"] = $contact["id"];
 207
 208                 if (!is_object($entries)) {
 209                         Logger::log("There are no entries in this feed.", Logger::DEBUG);
 210                         return;
 211                 }
 212
 213                 $items = [];
 214                 // Importing older entries first
 215                 for($i = $entries->length - 1; $i >= 0;--$i) {
 216                         $entry = $entries->item($i);
 217
 218                         $item = array_merge($header, $author);
 219
 220                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 221                         if (!is_object($alternate)) {
 222                                 $alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 223                         }
 224                         if (is_object($alternate)) {
 225                                 foreach ($alternate AS $attribute) {
 226                                         if ($attribute->name == "href") {
 227                                                 $item["plink"] = $attribute->textContent;
 228                                         }
 229                                 }
 230                         }
 231                         if (empty($item["plink"])) {
 232                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 233                         }
 234                         if (empty($item["plink"])) {
 235                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 236                         }
 237
 238                         $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 239
 240                         if (empty($item["uri"])) {
 241                                 $item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 242                         }
 243                         if (empty($item["uri"])) {
 244                                 $item["uri"] = $item["plink"];
 245                         }
 246
 247                         $orig_plink = $item["plink"];
 248
 249                         $item["plink"] = Network::finalUrl($item["plink"]);
 250
 251                         $item["parent-uri"] = $item["uri"];
 252
 253                         if (!$simulate) {
 254                                 $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
 255                                         $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
 256                                 $previous = Item::selectFirst(['id'], $condition);
 257                                 if (DBA::isResult($previous)) {
 258                                         Logger::log("Item with uri ".$item["uri"]." for user ".$importer["uid"]." already existed under id ".$previous["id"], Logger::DEBUG);
 259                                         continue;
 260                                 }
 261                         }
 262
 263                         $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 264
 265                         if (empty($item["title"])) {
 266                                 $item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 267                         }
 268                         if (empty($item["title"])) {
 269                                 $item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 270                         }
 271
 272                         $item["title"] = html_entity_decode($item["title"], ENT_QUOTES, 'UTF-8');
 273
 274                         $published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 275
 276                         if (empty($published)) {
 277                                 $published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 278                         }
 279                         if (empty($published)) {
 280                                 $published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 281                         }
 282                         $updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 283
 284                         if (empty($updated) && !empty($published)) {
 285                                 $updated = $published;
 286                         }
 287
 288                         if (empty($published) && !empty($updated)) {
 289                                 $published = $updated;
 290                         }
 291
 292                         if ($published != "") {
 293                                 $item["created"] = $published;
 294                         }
 295                         if ($updated != "") {
 296                                 $item["edited"] = $updated;
 297                         }
 298                         $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 299
 300                         if (empty($creator)) {
 301                                 $creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 302                         }
 303                         if (empty($creator)) {
 304                                 $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 305                         }
 306                         if ($creator != "") {
 307                                 $item["author-name"] = $creator;
 308                         }
 309                         $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 310
 311                         if ($creator != "") {
 312                                 $item["author-name"] = $creator;
 313                         }
 314
 315                         /// @TODO ?
 316                         // <category>Ausland</category>
 317                         // <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
 318
 319                         $attachments = [];
 320
 321                         $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
 322                         foreach ($enclosures AS $enclosure) {
 323                                 $href = "";
 324                                 $length = "";
 325                                 $type = "";
 326
 327                                 foreach ($enclosure->attributes AS $attribute) {
 328                                         if (in_array($attribute->name, ["url", "href"])) {
 329                                                 $href = $attribute->textContent;
 330                                         } elseif ($attribute->name == "length") {
 331                                                 $length = $attribute->textContent;
 332                                         } elseif ($attribute->name == "type") {
 333                                                 $type = $attribute->textContent;
 334                                         }
 335                                 }
 336                                 if (!empty($item["attach"])) {
 337                                         $item["attach"] .= ',';
 338                                 } else {
 339                                         $item["attach"] = '';
 340                                 }
 341
 342                                 $attachments[] = ["link" => $href, "type" => $type, "length" => $length];
 343
 344                                 $item["attach"] .= '[attach]href="'.$href.'" length="'.$length.'" type="'.$type.'"[/attach]';
 345                         }
 346
 347                         $tags = '';
 348                         $categories = $xpath->query("category", $entry);
 349                         foreach ($categories AS $category) {
 350                                 $hashtag = $category->nodeValue;
 351                                 if ($tags != '') {
 352                                         $tags .= ', ';
 353                                 }
 354
 355                                 $taglink = "#[url=" . System::baseUrl() . "/search?tag=" . $hashtag . "]" . $hashtag . "[/url]";
 356                                 $tags .= $taglink;
 357                         }
 358
 359                         $body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 360
 361                         if (empty($body)) {
 362                                 $body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 363                         }
 364
 365                         $summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 366
 367                         if (empty($summary)) {
 368                                 $summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 369                         }
 370
 371                         if (empty($body)) {
 372                                 $body = $summary;
 373                                 $summary = '';
 374                         }
 375
 376                         if ($body == $summary) {
 377                                 $summary = '';
 378                         }
 379
 380                         // remove the content of the title if it is identically to the body
 381                         // This helps with auto generated titles e.g. from tumblr
 382                         if (self::titleIsBody($item["title"], $body)) {
 383                                 $item["title"] = "";
 384                         }
 385                         $item["body"] = HTML::toBBCode($body, $basepath);
 386
 387                         if (($item["body"] == '') && ($item["title"] != '')) {
 388                                 $item["body"] = $item["title"];
 389                                 $item["title"] = '';
 390                         }
 391
 392                         $preview = '';
 393                         if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
 394                                 // Handle enclosures and treat them as preview picture
 395                                 foreach ($attachments AS $attachment) {
 396                                         if ($attachment["type"] == "image/jpeg") {
 397                                                 $preview = $attachment["link"];
 398                                         }
 399                                 }
 400
 401                                 // Remove a possible link to the item itself
 402                                 $item["body"] = str_replace($item["plink"], '', $item["body"]);
 403                                 $item["body"] = trim(preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]));
 404
 405                                 // Replace the content when the title is longer than the body
 406                                 $replace = (strlen($item["title"]) > strlen($item["body"]));
 407
 408                                 // Replace it, when there is an image in the body
 409                                 if (strstr($item["body"], '[/img]')) {
 410                                         $replace = true;
 411                                 }
 412
 413                                 // Replace it, when there is a link in the body
 414                                 if (strstr($item["body"], '[/url]')) {
 415                                         $replace = true;
 416                                 }
 417
 418                                 if ($replace) {
 419                                         $item["body"] = trim($item["title"]);
 420                                 }
 421
 422                                 $data = ParseUrl::getSiteinfoCached($item['plink'], true);
 423                                 if (!empty($data['text']) && !empty($data['title']) && (mb_strlen($item['body']) < mb_strlen($data['text']))) {
 424                                         // When the fetched page info text is longer than the body, we do try to enhance the body
 425                                         if (!empty($item['body']) && (strpos($data['title'], $item['body']) === false) && (strpos($data['text'], $item['body']) === false)) {
 426                                                 // The body is not part of the fetched page info title or page info text. So we add the text to the body
 427                                                 $item['body'] .= "\n\n" . $data['text'];
 428                                         } else {
 429                                                 // Else we replace the body with the page info text
 430                                                 $item['body'] = $data['text'];
 431                                         }
 432                                 }
 433
 434                                 // We always strip the title since it will be added in the page information
 435                                 $item["title"] = "";
 436                                 $item["body"] = $item["body"].add_page_info($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_blacklist"]);
 437                                 $item["tag"] = add_page_keywords($item["plink"], $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_blacklist"]);
 438                                 $item["object-type"] = Activity\ObjectType::BOOKMARK;
 439                                 unset($item["attach"]);
 440                         } else {
 441                                 if (!empty($summary)) {
 442                                         $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
 443                                 }
 444
 445                                 if ($contact["fetch_further_information"] == 3) {
 446                                         if (!empty($tags)) {
 447                                                 $item["tag"] = $tags;
 448                                         } else {
 449                                                 // @todo $preview is never set in this case, is it intended? - @MrPetovan 2018-02-13
 450                                                 $item["tag"] = add_page_keywords($item["plink"], $preview, true, $contact["ffi_keyword_blacklist"]);
 451                                         }
 452                                         $item["body"] .= "\n".$item['tag'];
 453                                 }
 454                                 // Add the link to the original feed entry if not present in feed
 455                                 if (($item['plink'] != '') && !strstr($item["body"], $item['plink'])) {
 456                                         $item["body"] .= "[hr][url]".$item['plink']."[/url]";
 457                                 }
 458                         }
 459
 460                         if (!$simulate) {
 461                                 Logger::log("Stored feed: ".print_r($item, true), Logger::DEBUG);
 462
 463                                 $notify = Item::isRemoteSelf($contact, $item);
 464
 465                                 // Distributed items should have a well formatted URI.
 466                                 // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
 467                                 if ($notify) {
 468                                         $item['guid'] = Item::guidFromUri($orig_plink, $a->getHostName());
 469                                         unset($item['uri']);
 470                                         unset($item['parent-uri']);
 471
 472                                         // Set the delivery priority for "remote self" to "medium"
 473                                         $notify = PRIORITY_MEDIUM;
 474                                 }
 475
 476                                 $id = Item::insert($item, false, $notify);
 477
 478                                 Logger::log("Feed for contact ".$contact["url"]." stored under id ".$id);
 479                         } else {
 480                                 $items[] = $item;
 481                         }
 482                         if ($simulate) {
 483                                 break;
 484                         }
 485                 }
 486
 487                 if ($simulate) {
 488                         return ["header" => $author, "items" => $items];
 489                 }
 490         }
 491
 492         private static function titleIsBody($title, $body)
 493         {
 494                 $title = strip_tags($title);
 495                 $title = trim($title);
 496                 $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 497                 $title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
 498
 499                 $body = strip_tags($body);
 500                 $body = trim($body);
 501                 $body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
 502                 $body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
 503
 504                 if (strlen($title) < strlen($body)) {
 505                         $body = substr($body, 0, strlen($title));
 506                 }
 507
 508                 if (($title != $body) && (substr($title, -3) == "...")) {
 509                         $pos = strrpos($title, "...");
 510                         if ($pos > 0) {
 511                                 $title = substr($title, 0, $pos);
 512                                 $body = substr($body, 0, $pos);
 513                         }
 514                 }
 515                 return ($title == $body);
 516         }
 517 }