Raise an error when host header is empty.

Signed-off-by: dblock <[email protected]>

src/OpenSearch/Aws/SigningClientDecorator.php

@@ -34,6 +34,10 @@ public function sendRequest(RequestInterface $request): ResponseInterface
             $request = $request->withHeader($name, $value);
         }
 
+        if (empty($request->getHeaderLine('Host'))) {
+            throw new \RuntimeException('Missing Host header.');
+        }
+
         $request = $request->withHeader('x-amz-content-sha256', hash('sha256', (string) $request->getBody()));
         $request = $this->signer->signRequest($request, $this->credentials);
         return $this->inner->sendRequest($request);

tests/Aws/SigningClientDecoratorTest.php

@@ -51,4 +51,28 @@ public function testSendRequest()
         $request = new Request('GET', 'http://localhost:9200/_search');
         $decorator->sendRequest($request);
     }
+
+    public function testSendRequestWithNullHostHeader(): void
+    {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Missing Host header.');
+        $client = $this->createMock(ClientInterface::class);
+        $credentials = $this->createMock(CredentialsInterface::class);
+        $signer = $this->createMock(SignatureV4::class);
+        $decorator = new SigningClientDecorator($client, $credentials, $signer, []);
+        $request = new Request('GET', 'http://localhost:9200/_search', ['Host' => null]);
+        $decorator->sendRequest($request);
+    }
+
+    public function testSendRequestWithEmptyHostHeader(): void
+    {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Missing Host header.');
+        $client = $this->createMock(ClientInterface::class);
+        $credentials = $this->createMock(CredentialsInterface::class);
+        $signer = $this->createMock(SignatureV4::class);
+        $decorator = new SigningClientDecorator($client, $credentials, $signer, []);
+        $request = new Request('GET', 'http://localhost:9200/_search', ['Host' => '']);
+        $decorator->sendRequest($request);
+    }
 }