Translate internal URL to external when needed

lib/WOPI/DiscoveryManager.php

@@ -88,6 +88,8 @@ class DiscoveryManager {
 		}
 
 		$responseBody = $response->getBody();
+                $replaceWith = str_replace("hostname.host", $_SERVER['HTTP_HOST'], $this->config->getAppValue('richdocuments', 'wopi_url'));
+                $responseBodyMangled = str_replace($this->config->getAppValue('richdocuments', 'wopi_internal_url'), $replaceWith, $responseBody);
                 // Skylar: Disable saving too, we don't need it if we're not loading ever
 		/*$file->putContent(
 			json_encode([
@@ -95,7 +97,7 @@ class DiscoveryManager {
 				'timestamp' => $this->timeFactory->getTime(),
 			])
 		);*/
-		return $responseBody;
+		return $responseBodyMangled;
 	}
 
 	public function refretch() {