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diff --git a/apps/dav/lib/CardDAV/Converter.php b/apps/dav/lib/CardDAV/Converter.php
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+++ b/apps/dav/lib/CardDAV/Converter.php
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+<?php
+/**
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\DAV\CardDAV;
+
+use OCP\IImage;
+use OCP\IUser;
+use Sabre\VObject\Component\VCard;
+use Sabre\VObject\Property\Text;
+
+class Converter {
+
+	/**
+	 * @param IUser $user
+	 * @return VCard
+	 */
+	public function createCardFromUser(IUser $user) {
+
+		$uid = $user->getUID();
+		$displayName = $user->getDisplayName();
+		$displayName = empty($displayName ) ? $uid : $displayName;
+		$emailAddress = $user->getEMailAddress();
+		$cloudId = $user->getCloudId();
+		$image = $this->getAvatarImage($user);
+
+		$vCard = new VCard();
+		$vCard->add(new Text($vCard, 'UID', $uid));
+		if (!empty($displayName)) {
+			$vCard->add(new Text($vCard, 'FN', $displayName));
+			$vCard->add(new Text($vCard, 'N', $this->splitFullName($displayName)));
+		}
+		if (!empty($emailAddress)) {
+			$vCard->add(new Text($vCard, 'EMAIL', $emailAddress, ['TYPE' => 'OTHER']));
+		}
+		if (!empty($cloudId)) {
+			$vCard->add(new Text($vCard, 'CLOUD', $cloudId));
+		}
+		if ($image) {
+			$vCard->add('PHOTO', $image->data(), ['ENCODING' => 'b', 'TYPE' => $image->mimeType()]);
+		}
+		$vCard->validate();
+
+		return $vCard;
+	}
+
+	/**
+	 * @param VCard $vCard
+	 * @param IUser $user
+	 * @return bool
+	 */
+	public function updateCard(VCard $vCard, IUser $user) {
+		$uid = $user->getUID();
+		$displayName = $user->getDisplayName();
+		$displayName = empty($displayName ) ? $uid : $displayName;
+		$emailAddress = $user->getEMailAddress();
+		$cloudId = $user->getCloudId();
+		$image = $this->getAvatarImage($user);
+
+		$updated = false;
+		if($this->propertyNeedsUpdate($vCard, 'FN', $displayName)) {
+			$vCard->FN = new Text($vCard, 'FN', $displayName);
+			unset($vCard->N);
+			$vCard->add(new Text($vCard, 'N', $this->splitFullName($displayName)));
+			$updated = true;
+		}
+		if($this->propertyNeedsUpdate($vCard, 'EMAIL', $emailAddress)) {
+			$vCard->EMAIL = new Text($vCard, 'EMAIL', $emailAddress);
+			$updated = true;
+		}
+		if($this->propertyNeedsUpdate($vCard, 'CLOUD', $cloudId)) {
+			$vCard->CLOUD = new Text($vCard, 'CLOUD', $cloudId);
+			$updated = true;
+		}
+
+		if($this->propertyNeedsUpdate($vCard, 'PHOTO', $image)) {
+			$vCard->add('PHOTO', $image->data(), ['ENCODING' => 'b', 'TYPE' => $image->mimeType()]);
+			$updated = true;
+		}
+
+		if (empty($emailAddress) && !is_null($vCard->EMAIL)) {
+			unset($vCard->EMAIL);
+			$updated = true;
+		}
+		if (empty($cloudId) && !is_null($vCard->CLOUD)) {
+			unset($vCard->CLOUD);
+			$updated = true;
+		}
+		if (empty($image) && !is_null($vCard->PHOTO)) {
+			unset($vCard->PHOTO);
+			$updated = true;
+		}
+
+		return $updated;
+	}
+
+	/**
+	 * @param VCard $vCard
+	 * @param string $name
+	 * @param string|IImage $newValue
+	 * @return bool
+	 */
+	private function propertyNeedsUpdate(VCard $vCard, $name, $newValue) {
+		if (is_null($newValue)) {
+			return false;
+		}
+		$value = $vCard->__get($name);
+		if (!is_null($value)) {
+			$value = $value->getValue();
+			$newValue = $newValue instanceof IImage ? $newValue->data() : $newValue;
+
+			return $value !== $newValue;
+		}
+		return true;
+	}
+
+	/**
+	 * @param string $fullName
+	 * @return string[]
+	 */
+	public function splitFullName($fullName) {
+		// Very basic western style parsing. I'm not gonna implement
+		// https://github.com/android/platform_packages_providers_contactsprovider/blob/master/src/com/android/providers/contacts/NameSplitter.java ;)
+
+		$elements = explode(' ', $fullName);
+		$result = ['', '', '', '', ''];
+		if (count($elements) > 2) {
+			$result[0] = implode(' ', array_slice($elements, count($elements)-1));
+			$result[1] = $elements[0];
+			$result[2] = implode(' ', array_slice($elements, 1, count($elements)-2));
+		} elseif (count($elements) === 2) {
+			$result[0] = $elements[1];
+			$result[1] = $elements[0];
+		} else {
+			$result[0] = $elements[0];
+		}
+
+		return $result;
+	}
+
+	/**
+	 * @param IUser $user
+	 * @return null|IImage
+	 */
+	private function getAvatarImage(IUser $user) {
+		try {
+			$image = $user->getAvatarImage(-1);
+			return $image;
+		} catch (\Exception $ex) {
+			return null;
+		}
+	}
+
+}