add xing to social sync

css/icons.scss

@@ -40,6 +40,7 @@
 @include icon-black-white('tumblr', 'contacts', 2);		// “tumblr (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/tumblr?style=brands)
 @include icon-black-white('twitter', 'contacts', 2);	// “twitter (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/twitter?style=brands)
 @include icon-black-white('diaspora', 'contacts', 2);	// “diaspora (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/diaspora?style=brands)
+@include icon-black-white('xing', 'contacts', 2);		// “xing (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/xing?style=brands)
 
 .icon-up-force-white {
 	// using #fffffe to trick the accessibility dark theme icon invert

img/license.txt

@@ -5,3 +5,4 @@
 * “tumblr (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/tumblr?style=brands)
 * “twitter (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/twitter?style=brands)
 * “diaspora (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/diaspora?style=brands)
+* “xing (fab)” by fontawesome.com is licensed under CC BY 4.0. (https://fontawesome.com/icons/xing?style=brands)

lib/Service/Social/CompositeSocialProvider.php

@@ -36,7 +36,8 @@ public function __construct(InstagramProvider $instagramProvider,
 								FacebookProvider $facebookProvider,
 								TwitterProvider $twitterProvider,
 								TumblrProvider $tumblrProvider,
-								DiasporaProvider $diasporaProvider) {
+								DiasporaProvider $diasporaProvider,
+								XingProvider $xingProvider) {
 
 		// This determines the priority of known providers
 		$this->providers = [
@@ -46,6 +47,7 @@ public function __construct(InstagramProvider $instagramProvider,
 			'facebook'  => $facebookProvider,
 			'tumblr'    => $tumblrProvider,
 			'diaspora'  => $diasporaProvider,
+			'xing'      => $xingProvider,
 		];
 	}
 

lib/Service/Social/XingProvider.php

@@ -0,0 +1,82 @@
+<?php
+/**
+ * @copyright Copyright (c) 2020 Matthias Heinisch <nextcloud@matthiasheinisch.de>
+ *
+ * @author Matthias Heinisch <nextcloud@matthiasheinisch.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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/>.
+ *
+ */
+
+namespace OCA\Contacts\Service\Social;
+
+use OCP\Http\Client\IClientService;
+
+class XingProvider implements ISocialProvider {
+
+	/** @var IClientService */
+	private $httpClient;
+
+	/** @var boolean */
+	private $looping;
+
+	public function __construct(IClientService $httpClient) {
+		$this->httpClient = $httpClient->NewClient();
+		$this->looping = false;
+	}
+
+	/**
+	 * Returns the profile-id
+	 *
+	 * @param {string} the value from the contact's x-socialprofile
+	 *
+	 * @return string
+	 */
+	public function cleanupId(string $candidate):string {
+		$candidate = preg_replace('/^' . preg_quote('x-apple:', '/') . '/', '', $candidate);
+		try {
+			if (strpos($candidate, 'http') !== 0) {
+				$candidate = 'https://www.xing.com/profile/' . $candidate;
+			}
+		} catch (Exception $e) {
+			$candidate = null;
+		}
+		return $candidate;
+	}
+
+	/**
+	 * Returns the profile-picture url
+	 *
+	 * @param {string} profileId the profile-id
+	 *
+	 * @return string|null
+	 */
+	public function getImageUrl(string $profileUrl):?string {
+		try {
+			$result = $this->httpClient->get($profileUrl);
+			$htmlResult = $result->getBody();
+
+			$avatar = '/.*src="(https:\/\/profile-images[a-zA-Z0-9\/.\-_]+\.jpg)".*/';
+			if (preg_match($avatar, $htmlResult, $matches)) {
+				return $matches[1];
+			}
+			// keyword not found, maybe page changed?
+			return null;
+		} catch (Exception $e) {
+			return null;
+		}
+	}
+}