Fix "Undefined array key" error for stream resources without URI

CHANGELOG.md

@@ -8,6 +8,8 @@
   a string, a `RichText` object or an array of them, instead of failing with `TypeError` or silently casting scalars
   to strings.
 - Bug #227: Discard keys of rich text arrays on serialization, so they are always sent as JSON arrays, not objects.
+- Bug #228: Fix "Undefined array key" error in `InputFile::filename()` and `CurlTransport` when a stream resource has
+  no URI.
 
 ## 0.22 August 25, 2026
 

src/Transport/CurlTransport.php

@@ -85,7 +85,7 @@ private function toCurlFile(InputFile $file): CURLFile|CURLStringFile
         }
 
         $metadata = stream_get_meta_data($file->pathOrResource);
-        if (!str_contains($metadata['uri'], '://')) {
+        if (isset($metadata['uri']) && !str_contains($metadata['uri'], '://')) {
             return new CURLFile($metadata['uri'], $mimeType, $file->filename());
         }
 

src/Type/InputFile.php

@@ -35,8 +35,12 @@ public function filename(): ?string
             return basename($this->pathOrResource);
         }
 
-        $uri = stream_get_meta_data($this->pathOrResource)['uri'];
-        return str_contains($uri, '://') ? null : basename($uri);
+        $uri = stream_get_meta_data($this->pathOrResource)['uri'] ?? null;
+        if ($uri === null || str_contains($uri, '://')) {
+            return null;
+        }
+
+        return basename($uri);
     }
 
     /**

tests/Support/TestHelper.php

@@ -5,6 +5,7 @@
 namespace Phptg\BotApi\Tests\Support;
 
 use Psr\Log\LoggerInterface;
+use RuntimeException;
 use Phptg\BotApi\Transport\ApiResponse;
 use Phptg\BotApi\TelegramBotApi;
 
@@ -26,4 +27,22 @@ public static function createSuccessStubApi(
             logger: $logger,
         );
     }
+
+    /**
+     * Creates a pair of connected sockets. Such stream resources have no URI in their metadata.
+     *
+     * @return array{resource, resource}
+     */
+    public static function createSocketPair(): array
+    {
+        $pair = stream_socket_pair(
+            PHP_OS_FAMILY === 'Windows' ? STREAM_PF_INET : STREAM_PF_UNIX,
+            STREAM_SOCK_STREAM,
+            STREAM_IPPROTO_IP,
+        );
+        if ($pair === false) {
+            throw new RuntimeException('Failed to create a socket pair.');
+        }
+        return $pair;
+    }
 }

tests/Transport/CurlTransport/CurlTransportTest.php

@@ -10,6 +10,7 @@
 use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use Phptg\BotApi\Tests\Curl\CurlMock;
+use Phptg\BotApi\Tests\Support\TestHelper;
 use Phptg\BotApi\Transport\CurlTransport;
 use Phptg\BotApi\Type\InputFile;
 
@@ -155,6 +156,29 @@ public function testPostWithResource(string $mimeType, ?string $filename): void
         assertSame($mimeType, $postFields['file']->mime);
     }
 
+    public function testPostWithResourceWithoutUri(): void
+    {
+        $curl = new CurlMock();
+        $transport = new CurlTransport(curl: $curl);
+
+        [$resource, $pair] = TestHelper::createSocketPair();
+        fwrite($pair, 'socket content');
+        fclose($pair);
+
+        $transport->postWithFiles(
+            '//url/method',
+            [],
+            ['file' => new InputFile($resource)],
+        );
+
+        fclose($resource);
+
+        $postFields = $curl->getOptions()[CURLOPT_POSTFIELDS];
+        assertInstanceOf(CURLStringFile::class, $postFields['file']);
+        assertSame('socket content', $postFields['file']->data);
+        assertSame('', $postFields['file']->postname);
+    }
+
     public function testSeekableResource(): void
     {
         $curl = new CurlMock();

tests/Transport/NativeTransport/NativeTransportTest.php

@@ -6,6 +6,7 @@
 
 use PHPUnit\Framework\TestCase;
 use RuntimeException;
+use Phptg\BotApi\Tests\Support\TestHelper;
 use Phptg\BotApi\Tests\Transport\NativeTransport\StreamMock\StreamMock;
 use Phptg\BotApi\Transport\MimeTypeResolver\MimeTypeResolverInterface;
 use Phptg\BotApi\Transport\NativeTransport;
@@ -269,6 +270,40 @@ public function testPostWithSeekableStreamResource(): void
         assertStringContainsString('stream content', $request['options']['http']['content']);
     }
 
+    public function testPostWithResourceWithoutUri(): void
+    {
+        $transport = new NativeTransport();
+
+        StreamMock::enable(
+            responseHeaders: [
+                'HTTP/1.1 200 OK',
+                'Content-Type: text/json',
+            ],
+            responseBody: '{"ok":true,"result":[]}',
+        );
+
+        [$resource, $pair] = TestHelper::createSocketPair();
+        fwrite($pair, 'socket content');
+        fclose($pair);
+
+        $transport->postWithFiles(
+            'http://url/method',
+            [],
+            ['file' => new InputFile($resource)],
+        );
+
+        fclose($resource);
+
+        $request = StreamMock::disable();
+
+        assertStringContainsString(
+            "Content-Disposition: form-data; name=\"file\"\r\n"
+            . "\r\n"
+            . "socket content\r\n",
+            $request['options']['http']['content'],
+        );
+    }
+
     public function testErrorOnSend(): void
     {
         $transport = new NativeTransport();

tests/Type/InputFileTest.php

@@ -5,6 +5,7 @@
 namespace Phptg\BotApi\Tests\Type;
 
 use PHPUnit\Framework\TestCase;
+use Phptg\BotApi\Tests\Support\TestHelper;
 use Phptg\BotApi\Type\InputFile;
 
 use function PHPUnit\Framework\assertNull;
@@ -53,6 +54,18 @@ public function testFromVirtualResource(): void
         fclose($resource);
     }
 
+    public function testFromResourceWithoutUri(): void
+    {
+        [$resource, $pair] = TestHelper::createSocketPair();
+        $file = new InputFile($resource);
+
+        assertNull($file->filename());
+        assertNull($file->extension());
+
+        fclose($resource);
+        fclose($pair);
+    }
+
     public function testFromResourceWithFilename(): void
     {
         $resource = fopen('php://temp', 'r+b');