GenericResolver provider

Author: matthewnessworthy

src/LinkShrink/Exception/MethodNotImplemented.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace LinkShrink\Exception;
+
+class MethodNotImplemented extends \RuntimeException implements Exception
+{
+
+}

src/LinkShrink/Provider/GenericResolver.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace LinkShrink\Provider;
+
+use Ivory\HttpAdapter\HttpAdapterException;
+use LinkShrink\Exception\MethodNotImplemented;
+
+class GenericResolver extends AbstractProvider implements Provider
+{
+    /**
+     * @inheritdoc
+     */
+    public function getName()
+    {
+        return 'generic_resolver';
+    }
+
+    /**
+     * @param string$url
+     *
+     * @return void
+     * @throws MethodNotImplemented
+     */
+    public function getShortenedUrl($url)
+    {
+        throw new MethodNotImplemented(sprintf('%s::%s not implimented.', get_class($this), 'shorten'));
+    }
+
+    /**
+     * @param string $url
+     *
+     * @return string
+     */
+    public function getExpandedUrl($url)
+    {
+        /**
+         * Attempt to use a HEAD request to fetch the redirect location, sometimes fails due to
+         * incorrect Content-Length header in the response
+         */
+        try {
+            return $this->getAdapter()->head($url)->getHeader('location');
+        } catch (HttpAdapterException $e) {
+            return $this->getAdapter()->get($url)->getHeader('location');
+        }
+    }
+}