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\Util\Network;
  18 use Friendica\Util\XML;
  19
  20 /**
  21  * @brief This class contain functions to import feeds
  22  *
  23  */
  24 class Feed {
  25         /**
  26          * @brief Read a RSS/RDF/Atom feed and create an item entry for it
  27          *
  28          * @param string $xml      The feed data
  29          * @param array  $importer The user record of the importer
  30          * @param array  $contact  The contact record of the feed
  31          * @param string $hub      Unused dummy value for compatibility reasons
  32          * @param bool   $simulate If enabled, no data is imported
  33          *
  34          * @return array In simulation mode it returns the header and the first item
  35          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  36          */
  37         public static function import($xml, $importer, &$contact, &$hub, $simulate = false) {
  38
  39                 $a = \get_app();
  40
  41                 if (!$simulate) {
  42                         Logger::log("Import Atom/RSS feed '".$contact["name"]."' (Contact ".$contact["id"].") for user ".$importer["uid"], Logger::DEBUG);
  43                 } else {
  44                         Logger::log("Test Atom/RSS feed", Logger::DEBUG);
  45                 }
  46                 if (empty($xml)) {
  47                         Logger::log('XML is empty.', Logger::DEBUG);
  48                         return;
  49                 }
  50
  51                 if (!empty($contact['poll'])) {
  52                         $basepath = $contact['poll'];
  53                 } elseif (!empty($contact['url'])) {
  54                         $basepath = $contact['url'];
  55                 } else {
  56                         $basepath = '';
  57                 }
  58
  59                 $doc = new DOMDocument();
  60                 @$doc->loadXML(trim($xml));
  61                 $xpath = new DOMXPath($doc);
  62                 $xpath->registerNamespace('atom', NAMESPACE_ATOM1);
  63                 $xpath->registerNamespace('dc', "http://purl.org/dc/elements/1.1/");
  64                 $xpath->registerNamespace('content', "http://purl.org/rss/1.0/modules/content/");
  65                 $xpath->registerNamespace('rdf', "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
  66                 $xpath->registerNamespace('rss', "http://purl.org/rss/1.0/");
  67                 $xpath->registerNamespace('media', "http://search.yahoo.com/mrss/");
  68                 $xpath->registerNamespace('poco', NAMESPACE_POCO);
  69
  70                 $author = [];
  71                 $entries = null;
  72
  73                 // Is it RDF?
  74                 if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
  75                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
  76                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
  77
  78                         if (empty($author["author-name"])) {
  79                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
  80                         }
  81                         $entries = $xpath->query('/rdf:RDF/rss:item');
  82                 }
  83
  84                 // Is it Atom?
  85                 if ($xpath->query('/atom:feed')->length > 0) {
  86                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
  87                         if (is_object($alternate)) {
  88                                 foreach ($alternate AS $attribute) {
  89                                         if ($attribute->name == "href") {
  90                                                 $author["author-link"] = $attribute->textContent;
  91                                         }
  92                                 }
  93                         }
  94
  95                         if (empty($author["author-link"])) {
  96                                 $self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
  97                                 if (is_object($self)) {
  98                                         foreach ($self AS $attribute) {
  99                                                 if ($attribute->name == "href") {
 100                                                         $author["author-link"] = $attribute->textContent;
 101                                                 }
 102                                         }
 103                                 }
 104                         }
 105
 106                         if (empty($author["author-link"])) {
 107                                 $author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 108                         }
 109                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 110
 111                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 112
 113                         if (empty($author["author-name"])) {
 114                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 115                         }
 116                         if (empty($author["author-name"])) {
 117                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 118                         }
 119                         $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 120                         if ($value != "") {
 121                                 $author["author-name"] = $value;
 122                         }
 123                         if ($simulate) {
 124                                 $author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:id/text()');
 125
 126                                 // See https://tools.ietf.org/html/rfc4287#section-3.2.2
 127                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()');
 128                                 if ($value != "") {
 129                                         $author["author-link"] = $value;
 130                                 }
 131
 132                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 133                                 if ($value != "") {
 134                                         $author["author-nick"] = $value;
 135                                 }
 136                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()');
 137                                 if ($value != "") {
 138                                         $author["author-location"] = $value;
 139                                 }
 140                                 $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()');
 141                                 if ($value != "") {
 142                                         $author["author-about"] = $value;
 143                                 }
 144                                 $avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 145                                 if (is_object($avatar)) {
 146                                         foreach ($avatar AS $attribute) {
 147                                                 if ($attribute->name == "href") {
 148                                                         $author["author-avatar"] = $attribute->textContent;
 149                                                 }
 150                                         }
 151                                 }
 152                         }
 153
 154                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:updated/text()');
 155
 156                         $author["app"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:generator/text()');
 157
 158                         $entries = $xpath->query('/atom:feed/atom:entry');
 159                 }
 160
 161                 // Is it RSS?
 162                 if ($xpath->query('/rss/channel')->length > 0) {
 163                         $author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 164
 165                         $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
 166                         $author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 167
 168                         if (empty($author["author-name"])) {
 169                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 170                         }
 171                         if (empty($author["author-name"])) {
 172                                 $author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 173                         }
 174                         $author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 175
 176                         $author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 177
 178                         $entries = $xpath->query('/rss/channel/item');
 179                 }
 180
 181                 if (!$simulate) {
 182                         $author["author-link"] = $contact["url"];
 183
 184                         if (empty($author["author-name"])) {
 185                                 $author["author-name"] = $contact["name"];
 186                         }
 187                         $author["author-avatar"] = $contact["thumb"];
 188
 189                         $author["owner-link"] = $contact["url"];
 190                         $author["owner-name"] = $contact["name"];
 191                         $author["owner-avatar"] = $contact["thumb"];
 192                 }
 193
 194                 $header = [];
 195                 $header["uid"] = $importer["uid"];
 196                 $header["network"] = Protocol::FEED;
 197                 $header["wall"] = 0;
 198                 $header["origin"] = 0;
 199                 $header["gravity"] = GRAVITY_PARENT;
 200                 $header["private"] = 2;
 201                 $header["verb"] = ACTIVITY_POST;
 202                 $header["object-type"] = ACTIVITY_OBJ_NOTE;
 203
 204                 $header["contact-id"] = $contact["id"];
 205
 206                 if (!is_object($entries)) {
 207                         Logger::log("There are no entries in this feed.", Logger::DEBUG);
 208                         return;
 209                 }
 210
 211                 $items = [];
 212                 // Importing older entries first
 213                 for($i = $entries->length - 1; $i >= 0;--$i) {
 214                         $entry = $entries->item($i);
 215
 216                         $item = array_merge($header, $author);
 217
 218                         $alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 219                         if (!is_object($alternate)) {
 220                                 $alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 221                         }
 222                         if (is_object($alternate)) {
 223                                 foreach ($alternate AS $attribute) {
 224                                         if ($attribute->name == "href") {
 225                                                 $item["plink"] = $attribute->textContent;
 226                                         }
 227                                 }
 228                         }
 229                         if (empty($item["plink"])) {
 230                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 231                         }
 232                         if (empty($item["plink"])) {
 233                                 $item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 234                         }
 235
 236                         $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 237
 238                         if (empty($item["uri"])) {
 239                                 $item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 240                         }
 241                         if (empty($item["uri"])) {
 242                                 $item["uri"] = $item["plink"];
 243                         }
 244
 245                         $orig_plink = $item["plink"];
 246
 247                         $item["plink"] = Network::finalUrl($item["plink"]);
 248
 249                         $item["parent-uri"] = $item["uri"];
 250
 251                         if (!$simulate) {
 252                                 $condition = ["`uid` = ? AND `uri` = ? AND `network` IN (?, ?)",
 253                                         $importer["uid"], $item["uri"], Protocol::FEED, Protocol::DFRN];
 254                                 $previous = Item::selectFirst(['id'], $condition);
 255                                 if (DBA::isResult($previous)) {
 256                                         Logger::log("Item with uri ".$item["uri"]." for user ".$importer["uid"]." already existed under id ".$previous["id"], Logger::DEBUG);
 257                                         continue;
 258                                 }
 259                         }
 260
 261                         $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 262
 263                         if (empty($item["title"])) {
 264                                 $item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 265                         }
 266                         if (empty($item["title"])) {
 267                                 $item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 268                         }
 269                         $published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 270
 271                         if (empty($published)) {
 272                                 $published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 273                         }
 274                         if (empty($published)) {
 275                                 $published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 276                         }
 277                         $updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 278
 279                         if (empty($updated) && !empty($published)) {
 280                                 $updated = $published;
 281                         }
 282
 283                         if (empty($published) && !empty($updated)) {
 284                                 $published = $updated;
 285                         }
 286
 287                         if ($published != "") {
 288                                 $item["created"] = $published;
 289                         }
 290                         if ($updated != "") {
 291                                 $item["edited"] = $updated;
 292                         }
 293                         $creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 294
 295                         if (empty($creator)) {
 296                                 $creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 297                         }
 298                         if (empty($creator)) {
 299                                 $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 300                         }
 301                         if ($creator != "") {
 302                                 $item["author-name"] = $creator;
 303                         }
 304                         $creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 305
 306                         if ($creator != "") {
 307                                 $item["author-name"] = $creator;
 308                         }
 309
 310                         /// @TODO ?
 311                         // <category>Ausland</category>
 312                         // <media:thumbnail width="152" height="76" url="http://www.taz.de/picture/667875/192/14388767.jpg"/>
 313
 314                         $attachments = [];
 315
 316                         $enclosures = $xpath->query("enclosure|atom:link[@rel='enclosure']", $entry);
 317                         foreach ($enclosures AS $enclosure) {
 318                                 $href = "";
 319                                 $length = "";
 320                                 $type = "";
 321
 322                                 foreach ($enclosure->attributes AS $attribute) {
 323                                         if (in_array($attribute->name, ["url", "href"])) {
 324                                                 $href = $attribute->textContent;
 325                                         } elseif ($attribute->name == "length") {
 326                                                 $length = $attribute->textContent;
 327                                         } elseif ($attribute->name == "type") {
 328                                                 $type = $attribute->textContent;
 329                                         }
 330                                 }
 331                                 if (!empty($item["attach"])) {
 332                                         $item["attach"] .= ',';
 333                                 } else {
 334                                         $item["attach"] = '';
 335                                 }
 336
 337                                 $attachments[] = ["link" => $href, "type" => $type, "length" => $length];
 338
 339                                 $item["attach"] .= '[attach]href="'.$href.'" length="'.$length.'" type="'.$type.'"[/attach]';
 340                         }
 341
 342                         $tags = '';
 343                         $categories = $xpath->query("category", $entry);
 344                         foreach ($categories AS $category) {
 345                                 $hashtag = $category->nodeValue;
 346                                 if ($tags != '') {
 347                                         $tags .= ', ';
 348                                 }
 349
 350                                 $taglink = "#[url=" . System::baseUrl() . "/search?tag=" . $hashtag . "]" . $hashtag . "[/url]";
 351                                 $tags .= $taglink;
 352                         }
 353
 354                         $body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 355
 356                         if (empty($body)) {
 357                                 $body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 358                         }
 359
 360                         $summary = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 361
 362                         if (empty($summary)) {
 363                                 $summary = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 364                         }
 365
 366                         if (empty($body)) {
 367                                 $body = $summary;
 368                                 $summary = '';
 369                         }
 370
 371                         if ($body == $summary) {
 372                                 $summary = '';
 373                         }
 374
 375                         // remove the content of the title if it is identically to the body
 376                         // This helps with auto generated titles e.g. from tumblr
 377                         if (self::titleIsBody($item["title"], $body)) {
 378                                 $item["title"] = "";
 379                         }
 380                         $item["body"] = HTML::toBBCode($body, $basepath);
 381
 382                         if (($item["body"] == '') && ($item["title"] != '')) {
 383                                 $item["body"] = $item["title"];
 384                                 $item["title"] = '';
 385                         }
 386
 387                         $preview = '';
 388                         if (!empty($contact["fetch_further_information"]) && ($contact["fetch_further_information"] < 3)) {
 389                                 // Handle enclosures and treat them as preview picture
 390                                 foreach ($attachments AS $attachment) {
 391                                         if ($attachment["type"] == "image/jpeg") {
 392                                                 $preview = $attachment["link"];
 393                                         }
 394                                 }
 395
 396                                 // Remove a possible link to the item itself
 397                                 $item["body"] = str_replace($item["plink"], '', $item["body"]);
 398                                 $item["body"] = preg_replace('/\[url\=\](\w+.*?)\[\/url\]/i', '', $item["body"]);
 399
 400                                 // Replace the content when the title is longer than the body
 401                                 $replace = (strlen($item["title"]) > strlen($item["body"]));
 402
 403                                 // Replace it, when there is an image in the body
 404                                 if (strstr($item["body"], '[/img]')) {
 405                                         $replace = true;
 406                                 }
 407
 408                                 // Replace it, when there is a link in the body
 409                                 if (strstr($item["body"], '[/url]')) {
 410                                         $replace = true;
 411                                 }
 412
 413                                 if ($replace) {
 414                                         $item["body"] = $item["title"];
 415                                 }
 416                                 // We always strip the title since it will be added in the page information
 417                                 $item["title"] = "";
 418                                 $item["body"] = $item["body"].add_page_info($item["plink"], false, $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_blacklist"]);
 419                                 $item["tag"] = add_page_keywords($item["plink"], $preview, ($contact["fetch_further_information"] == 2), $contact["ffi_keyword_blacklist"]);
 420                                 $item["object-type"] = ACTIVITY_OBJ_BOOKMARK;
 421                                 unset($item["attach"]);
 422                         } else {
 423                                 if (!empty($summary)) {
 424                                         $item["body"] = '[abstract]' . HTML::toBBCode($summary, $basepath) . "[/abstract]\n" . $item["body"];
 425                                 }
 426
 427                                 if ($contact["fetch_further_information"] == 3) {
 428                                         if (!empty($tags)) {
 429                                                 $item["tag"] = $tags;
 430                                         } else {
 431                                                 // @todo $preview is never set in this case, is it intended? - @MrPetovan 2018-02-13
 432                                                 $item["tag"] = add_page_keywords($item["plink"], $preview, true, $contact["ffi_keyword_blacklist"]);
 433                                         }
 434                                         $item["body"] .= "\n".$item['tag'];
 435                                 }
 436                                 // Add the link to the original feed entry if not present in feed
 437                                 if (($item['plink'] != '') && !strstr($item["body"], $item['plink'])) {
 438                                         $item["body"] .= "[hr][url]".$item['plink']."[/url]";
 439                                 }
 440                         }
 441
 442                         if (!$simulate) {
 443                                 Logger::log("Stored feed: ".print_r($item, true), Logger::DEBUG);
 444
 445                                 $notify = Item::isRemoteSelf($contact, $item);
 446
 447                                 // Distributed items should have a well formatted URI.
 448                                 // Additionally we have to avoid conflicts with identical URI between imported feeds and these items.
 449                                 if ($notify) {
 450                                         $item['guid'] = Item::guidFromUri($orig_plink, $a->getHostName());
 451                                         unset($item['uri']);
 452                                         unset($item['parent-uri']);
 453
 454                                         // Set the delivery priority for "remote self" to "medium"
 455                                         $notify = PRIORITY_MEDIUM;
 456                                 }
 457
 458                                 $id = Item::insert($item, false, $notify);
 459
 460                                 Logger::log("Feed for contact ".$contact["url"]." stored under id ".$id);
 461                         } else {
 462                                 $items[] = $item;
 463                         }
 464                         if ($simulate) {
 465                                 break;
 466                         }
 467                 }
 468
 469                 if ($simulate) {
 470                         return ["header" => $author, "items" => $items];
 471                 }
 472         }
 473
 474         private static function titleIsBody($title, $body)
 475         {
 476                 $title = strip_tags($title);
 477                 $title = trim($title);
 478                 $title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
 479                 $title = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $title);
 480
 481                 $body = strip_tags($body);
 482                 $body = trim($body);
 483                 $body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
 484                 $body = str_replace(["\n", "\r", "\t", " "], ["", "", "", ""], $body);
 485
 486                 if (strlen($title) < strlen($body)) {
 487                         $body = substr($body, 0, strlen($title));
 488                 }
 489
 490                 if (($title != $body) && (substr($title, -3) == "...")) {
 491                         $pos = strrpos($title, "...");
 492                         if ($pos > 0) {
 493                                 $title = substr($title, 0, $pos);
 494                                 $body = substr($body, 0, $pos);
 495                         }
 496                 }
 497                 return ($title == $body);
 498         }
 499 }