Implement NCN API v1-2 server version reporting

- Fixes #29
- Yes, it's trivial, but now it's done!

lib/REST/NextCloudNews/V1_2.php

@@ -131,4 +131,29 @@ class V1_2 extends \JKingWeb\Arsse\REST\AbstractHandler {
         }
         return new Response(204);
     }
+
+    protected function versionGET(array $url, array $data): Response {
+        // if URL is more than '/version' this is an error
+        if(sizeof($url)) return new Response(404);
+        return new Response(200, ['version' => \JKingWeb\Arsse\VERSION]);
+    }
+
+    protected function versionPOST(array $url, array $data): Response {
+        // if URL is more than '/version' this is an error
+        if(sizeof($url)) return new Response(404);
+        return new Response(405, "", "", ['Allow: GET']);
+    }
+
+    protected function versionPUT(array $url, array $data): Response {
+        // if URL is more than '/version' this is an error
+        if(sizeof($url)) return new Response(404);
+        return new Response(405, "", "", ['Allow: GET']);
+    }
+
+    protected function versionDELETE(array $url, array $data): Response {
+        // if URL is more than '/version' this is an error
+        if(sizeof($url)) return new Response(404);
+        return new Response(405, "", "", ['Allow: GET']);
+    }
+
 }

tests/REST/NextCloudNews/TestNCNV1_2.php

@@ -38,8 +38,17 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
 				['PUT',    "/folders/1/invalid"],
 				['POST',   "/folders/1/invalid"],
 				['DELETE', "/folders/1/invalid"],
+				['GET',    "/version/invalid"],
+				['PUT',    "/version/invalid"],
+				['POST',   "/version/invalid"],
+				['DELETE', "/version/invalid"],
 			],
 			405 => [
+				'GET' => [
+					['PUT',    "/version"],
+					['POST',   "/version"],
+					['DELETE', "/version"],
+				],
 				'GET, POST' => [
 					['PUT',    "/folders"],
 					['DELETE', "/folders"],
@@ -153,4 +162,9 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
 		$exp = new Response(404);
 		$this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/folders/3", json_encode($in[0]), 'application/json')));
 	}
+
+	function testRetrieveServerVersion() {
+		$exp = new Response(200, ['version' => \JKingWeb\Arsse\VERSION]);
+		$this->assertEquals($exp, $this->h->dispatch(new Request("GET", "/version")));
+	}
 }