Add simple shortlinker class

inc/class-wpseo-shortlinker.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * @package WPSEO
+ */
+
+/**
+ * Helps with creating shortlinks in the plugin
+ */
+class WPSEO_Shortlinker {
+
+	/**
+	 * @var string
+	 */
+	protected $version;
+
+	/**
+	 * @param string $version The version to put in the utm_content tag.
+	 */
+	public function __construct( $version ) {
+		$this->version = $version;
+	}
+
+	/**
+	 * Builds a URL to use in the plugin as shortlink.
+	 *
+	 * @param string $url The URL to build upon.
+	 *
+	 * @return string The final URL.
+	 */
+	public function build_shortlink( $url ) {
+		return $url . '?utm_content=' . $this->version;
+	}
+
+	/**
+	 * Returns a version of the URL with a utm_content with the current version.
+	 *
+	 * @param string $url The URL to build upon.
+	 *
+	 * @return string The final URL.
+	 */
+	public static function get( $url ) {
+		$version = WPSEO_VERSION;
+
+		$version = apply_filters( 'wpseo_shortlink_version', $version );
+
+		$shortlinker = new WPSEO_Shortlinker( $version );
+
+		return $shortlinker->build_shortlink( $url );
+	}
+}

tests/inc/test-class-wpseo-shortlinker.php

@@ -0,0 +1,19 @@
+<?php
+
+
+class WPSEO_Shortlinker_Test extends PHPUnit_Framework_TestCase {
+
+	public function test_build_shortlink() {
+		$shortlinks = new WPSEO_Shortlinker( 'version' );
+
+		$shortlink = $shortlinks->build_shortlink( 'http://yoa.st/abcdefg' );
+
+		$this->assertEquals( 'http://yoa.st/abcdefg?utm_content=version', $shortlink );
+	}
+
+	public function test_get() {
+		$shortlink = WPSEO_Shortlinker::get( 'http://yoa.st/blaat' );
+
+		$this->assertEquals( 'http://yoa.st/blaat?utm_content=' . WPSEO_VERSION, $shortlink );
+	}
+}