Implement single-feed querying

lib/REST/Miniflux/V1.php

@@ -702,6 +702,18 @@ class V1 extends \JKingWeb\Arsse\REST\AbstractHandler {
         return new Response($out);
     }
 
+    protected function getFeed(array $path): ResponseInterface {
+        $tr = Arsse::$db->begin();
+        try {
+            $sub = Arsse::$db->subscriptionPropertiesGet(Arsse::$user->id, (int) $path[1]);
+        } catch (ExceptionInput $e) {
+            return new ErrorResponse("404", 404);
+        }
+        // compile the list of folders; the feed list includes folder names
+        $folders = $this->mapFolders();
+        return new Response($this->transformFeed($sub, $folders));
+    }
+
     protected function createFeed(array $data): ResponseInterface {
         try {
             Arsse::$db->feedAdd($data['feed_url'], (string) $data['username'], (string) $data['password'], false, (bool) $data['crawler']);

tests/cases/REST/Miniflux/TestV1.php

@@ -564,9 +564,7 @@ class TestV1 extends \JKingWeb\Arsse\Test\AbstractTest {
     }
 
     public function testListFeedsOfTheRootCategory(): void {
-        \Phake::when(Arsse::$db)->folderList->thenReturn(new Result($this->v([
-            ['id' => 5, 'name' => "Cat Ook"],
-        ])));
+        \Phake::when(Arsse::$db)->folderList->thenReturn(new Result($this->v([['id' => 5, 'name' => "Cat Ook"],])));
         \Phake::when(Arsse::$db)->subscriptionList->thenReturn(new Result($this->v($this->feeds)));
         $exp = new Response($this->feedsOut);
         $this->assertMessage($exp, $this->req("GET", "/categories/1/feeds"));
@@ -580,6 +578,21 @@ class TestV1 extends \JKingWeb\Arsse\Test\AbstractTest {
         \Phake::verify(Arsse::$db)->subscriptionList(Arsse::$user->id, 2111, true);
     }
 
+    public function testGetAFeed(): void {
+        \Phake::when(Arsse::$db)->subscriptionPropertiesGet->thenReturn($this->v($this->feeds[0]))->thenReturn($this->v($this->feeds[1]));
+        \Phake::when(Arsse::$db)->folderList->thenReturn(new Result($this->v([['id' => 5, 'name' => "Cat Ook"],])));
+        $this->assertMessage(new Response($this->feedsOut[0]), $this->req("GET", "/feeds/1"));
+        \Phake::verify(Arsse::$db)->subscriptionPropertiesGet(Arsse::$user->id, 1);
+        $this->assertMessage(new Response($this->feedsOut[1]), $this->req("GET", "/feeds/55"));
+        \Phake::verify(Arsse::$db)->subscriptionPropertiesGet(Arsse::$user->id, 55);
+    }
+
+    public function testGetAMissingFeed(): void {
+        \Phake::when(Arsse::$db)->subscriptionPropertiesGet->thenThrow(new ExceptionInput("subjectMissing"));
+        $this->assertMessage(new ErrorResponse("404", 404), $this->req("GET", "/feeds/1"));
+        \Phake::verify(Arsse::$db)->subscriptionPropertiesGet(Arsse::$user->id, 1);
+    }
+
     /** @dataProvider provideFeedCreations */
     public function testCreateAFeed(array $in, $out1, $out2, $out3, $out4, ResponseInterface $exp): void {
         if ($out1 instanceof \Exception) {