feat: add JsonBodyParser middleware#1
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Add JsonBodyParser middleware that solves the php://input non-seekable
stream issue by reading the request body once and caching the parsed
JSON in the request's parsedBody property.
This implements the standard PSR-7 pattern for handling request bodies,
allowing controllers to use getParsedBody() instead of reading the
stream directly.
Usage:
$mapper->connect('route', '/path', [
'controller' => MyController::class,
'stack' => [JsonBodyParser::class],
]);
In controllers:
$body = $request->getParsedBody(); // array|null
Refs: PSR-7 ServerRequestInterface::getParsedBody()
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Implements PSR-15 middleware for parsing JSON request bodies into parsed body attributes, with proper PSR-7 stream rewinding and error handling for malformed JSON.