Use JSON_THROW_ON_ERROR instead of custom error handling

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/public/AppFramework/Http/JSONResponse.php

@@ -64,13 +64,7 @@ class JSONResponse extends Response {
 	 * @throws \Exception If data could not get encoded
 	 */
 	public function render() {
-		$response = json_encode($this->data, JSON_HEX_TAG);
-		if ($response === false) {
-			throw new \Exception(sprintf('Could not json_encode due to invalid ' .
-				'non UTF-8 characters in the array: %s', var_export($this->data, true)));
-		}
-
-		return $response;
+		return json_encode($this->data, JSON_HEX_TAG | JSON_THROW_ON_ERROR);
 	}
 
 	/**

tests/lib/AppFramework/Http/JSONResponseTest.php

@@ -88,10 +88,10 @@ class JSONResponseTest extends \Test\TestCase {
 		$this->assertEquals($expected, $this->json->render());
 	}
 
-	
+
 	public function testRenderWithNonUtf8Encoding() {
-		$this->expectException(\Exception::class);
-		$this->expectExceptionMessage('Could not json_encode due to invalid non UTF-8 characters in the array: array (');
+		$this->expectException(\JsonException::class);
+		$this->expectExceptionMessage('Malformed UTF-8 characters, possibly incorrectly encoded');
 
 		$params = ['test' => hex2bin('e9')];
 		$this->json->setData($params);