+
+ /**
+ * 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 $namespace Namespace to look under
+ *
+ * @return DOMElement found element or null
+ */
+
+ static function child($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 $namespace Namespace to use, defaults to Atom
+ *
+ * @return string content of the child
+ */
+
+ static function childContent($element, $tag, $namespace=self::ATOM)
+ {
+ $el = self::child($element, $tag, $namespace);
+
+ if (empty($el)) {
+ return null;
+ } else {
+ return $el->textContent;
+ }
+ }
+
+ /**
+ * 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)
+ {
+ $contentEl = ActivityUtils::child($element, self::CONTENT);
+
+ if (!empty($contentEl)) {
+
+ $src = $contentEl->getAttribute(self::SRC);
+
+ if (!empty($src)) {
+ throw new ClientException(_("Can't handle remote content yet."));
+ }
+
+ $type = $contentEl->getAttribute(self::TYPE);
+
+ // slavishly following http://atompub.org/rfc4287.html#rfc.section.4.1.3.3
+
+ if ($type == 'text') {
+ return $contentEl->textContent;
+ } else if ($type == 'html') {
+ $text = $contentEl->textContent;
+ return htmlspecialchars_decode($text, ENT_QUOTES);
+ } else if ($type == 'xhtml') {
+ $divEl = ActivityUtils::child($contentEl, 'div');
+ 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(array('text/xml', 'application/xml'), $type) ||
+ preg_match('#(+|/)xml$#', $type)) {
+ throw new ClientException(_("Can't handle embedded XML content yet."));
+ } else if (strncasecmp($type, 'text/', 5)) {
+ return $contentEl->textContent;
+ } else {
+ throw new ClientException(_("Can't handle embedded Base64 content yet."));
+ }
+ }
+ }