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Diffstat (limited to 'lib/activityutils.php')
| -rw-r--r-- | lib/activityutils.php | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/lib/activityutils.php b/lib/activityutils.php new file mode 100644 index 000000000..c85a3db55 --- /dev/null +++ b/lib/activityutils.php @@ -0,0 +1,243 @@ +<?php +/** + * StatusNet, the distributed open-source microblogging tool + * + * An activity + * + * PHP version 5 + * + * LICENCE: This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * @category Feed + * @package StatusNet + * @author Evan Prodromou <evan@status.net> + * @author Zach Copley <zach@status.net> + * @copyright 2010 StatusNet, Inc. + * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3 + * @link http://status.net/ + */ + +if (!defined('STATUSNET')) { + exit(1); +} + +/** + * Utilities for turning DOMish things into Activityish things + * + * Some common functions that I didn't have the bandwidth to try to factor + * into some kind of reasonable superclass, so just dumped here. Might + * be useful to have an ActivityObject parent class or something. + * + * @category OStatus + * @package StatusNet + * @author Evan Prodromou <evan@status.net> + * @copyright 2010 StatusNet, Inc. + * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3 + * @link http://status.net/ + */ + +class ActivityUtils +{ + const ATOM = 'http://www.w3.org/2005/Atom'; + + const LINK = 'link'; + const REL = 'rel'; + const TYPE = 'type'; + const HREF = 'href'; + + const CONTENT = 'content'; + const SRC = 'src'; + + /** + * Get the permalink for an Activity object + * + * @param DOMElement $element A DOM element + * + * @return string related link, if any + */ + + static function getPermalink($element) + { + return self::getLink($element, 'alternate', 'text/html'); + } + + /** + * Get the permalink for an Activity object + * + * @param DOMElement $element A DOM element + * + * @return string related link, if any + */ + + static function getLink(DOMNode $element, $rel, $type=null) + { + $els = $element->childNodes; + + foreach ($els as $link) { + + if (!($link instanceof DOMElement)) { + continue; + } + + if ($link->localName == self::LINK && $link->namespaceURI == self::ATOM) { + + $linkRel = $link->getAttribute(self::REL); + $linkType = $link->getAttribute(self::TYPE); + + if ($linkRel == $rel && + (is_null($type) || $linkType == $type)) { + return $link->getAttribute(self::HREF); + } + } + } + + return null; + } + + static function getLinks(DOMNode $element, $rel, $type=null) + { + $els = $element->childNodes; + $out = array(); + + foreach ($els as $link) { + if ($link->localName == self::LINK && $link->namespaceURI == self::ATOM) { + + $linkRel = $link->getAttribute(self::REL); + $linkType = $link->getAttribute(self::TYPE); + + if ($linkRel == $rel && + (is_null($type) || $linkType == $type)) { + $out[] = $link; + } + } + } + + return $out; + } + + /** + * Gets the first child element with the given tag + * + * @param DOMElement $element element to pick at + * @param string $tag tag to look for + * @param string $namespace Namespace to look under + * + * @return DOMElement found element or null + */ + + static function child(DOMNode $element, $tag, $namespace=self::ATOM) + { + $els = $element->childNodes; + if (empty($els) || $els->length == 0) { + return null; + } else { + for ($i = 0; $i < $els->length; $i++) { + $el = $els->item($i); + if ($el->localName == $tag && $el->namespaceURI == $namespace) { + return $el; + } + } + } + } + + /** + * Grab the text content of a DOM element child of the current element + * + * @param DOMElement $element Element whose children we examine + * @param string $tag Tag to look up + * @param string $namespace Namespace to use, defaults to Atom + * + * @return string content of the child + */ + + static function childContent(DOMNode $element, $tag, $namespace=self::ATOM) + { + $el = self::child($element, $tag, $namespace); + + if (empty($el)) { + return null; + } else { + return $el->textContent; + } + } + + static function childHtmlContent(DOMNode $element, $tag, $namespace=self::ATOM) + { + $el = self::child($element, $tag, $namespace); + + if (empty($el)) { + return null; + } else { + return self::textConstruct($el); + } + } + + /** + * Get the content of an atom:entry-like object + * + * @param DOMElement $element The element to examine. + * + * @return string unencoded HTML content of the element, like "This -< is <b>HTML</b>." + * + * @todo handle remote content + * @todo handle embedded XML mime types + * @todo handle base64-encoded non-XML and non-text mime types + */ + + static function getContent($element) + { + return self::childHtmlContent($element, self::CONTENT, self::ATOM); + } + + static function textConstruct($el) + { + $src = $el->getAttribute(self::SRC); + + if (!empty($src)) { + throw new ClientException(_("Can't handle remote content yet.")); + } + + $type = $el->getAttribute(self::TYPE); + + // slavishly following http://atompub.org/rfc4287.html#rfc.section.4.1.3.3 + + if (empty($type) || $type == 'text') { + return $el->textContent; + } else if ($type == 'html') { + $text = $el->textContent; + return htmlspecialchars_decode($text, ENT_QUOTES); + } else if ($type == 'xhtml') { + $divEl = ActivityUtils::child($el, 'div', 'http://www.w3.org/1999/xhtml'); + if (empty($divEl)) { + return null; + } + $doc = $divEl->ownerDocument; + $text = ''; + $children = $divEl->childNodes; + + for ($i = 0; $i < $children->length; $i++) { + $child = $children->item($i); + $text .= $doc->saveXML($child); + } + return trim($text); + } else if (in_array($type, array('text/xml', 'application/xml')) || + preg_match('#(+|/)xml$#', $type)) { + throw new ClientException(_("Can't handle embedded XML content yet.")); + } else if (strncasecmp($type, 'text/', 5)) { + return $el->textContent; + } else { + throw new ClientException(_("Can't handle embedded Base64 content yet.")); + } + } +} |