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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Router; |
| 6 | |
| 7 | use Celema\Router\Exception\RuntimeException; |
| 8 | use Celema\Router\Exception\UnresolvableParameter; |
| 9 | use Celema\Wire\Creator; |
| 10 | use Celema\Wire\Exception\WireException; |
| 11 | use Closure; |
| 12 | use Psr\Container\ContainerInterface as Container; |
| 13 | use Psr\Http\Message\ResponseInterface as Response; |
| 14 | use Psr\Http\Message\ServerRequestInterface as Request; |
| 15 | use Psr\Http\Server\MiddlewareInterface as Middleware; |
| 16 | use ReflectionClass; |
| 17 | use ReflectionFunction; |
| 18 | use ReflectionFunctionAbstract; |
| 19 | use ReflectionMethod; |
| 20 | use ReflectionNamedType; |
| 21 | use ReflectionParameter; |
| 22 | |
| 23 | /** @internal */ |
| 24 | final class View |
| 25 | { |
| 26 | use AddsBeforeAfter; |
| 27 | |
| 28 | private Creator $creator; |
| 29 | private ?AttributesResolver $attributes = null; |
| 30 | |
| 31 | /** @var Closure|array{class-string, string} */ |
| 32 | private Closure|array $view; |
| 33 | |
| 34 | /** |
| 35 | * @param list<Before> $beforeHandlers |
| 36 | * @param list<After> $afterHandlers |
| 37 | */ |
| 38 | public function __construct( |
| 39 | protected readonly RouteMatch $match, |
| 40 | protected readonly ?Container $container, |
| 41 | array $beforeHandlers = [], |
| 42 | array $afterHandlers = [], |
| 43 | ) { |
| 44 | $route = $match->route(); |
| 45 | $this->creator = new Creator($container); |
| 46 | $this->view = $this->prepareView($route->view()); |
| 47 | $this->beforeHandlers = $this->doMergeBeforeHandlers($beforeHandlers, $route->beforeHandlers()); |
| 48 | $this->afterHandlers = $this->doMergeAfterHandlers($afterHandlers, $route->afterHandlers()); |
| 49 | } |
| 50 | |
| 51 | public function execute(Request $request): Response |
| 52 | { |
| 53 | $closure = $this->getClosure($request); |
| 54 | |
| 55 | foreach ($this->mergeBeforeHandlers($this->attributes(Before::class)) as $handler) { |
| 56 | $request = $handler->handle($request); |
| 57 | } |
| 58 | |
| 59 | /** @psalm-suppress MixedAssignment -- views may return arbitrary data for after handlers */ |
| 60 | $result = $closure(...$this->getArgs(new ReflectionFunction($closure), $request)); |
| 61 | |
| 62 | foreach ($this->mergeAfterHandlers($this->attributes(After::class)) as $handler) { |
| 63 | /** @psalm-suppress MixedAssignment -- after handlers may transform arbitrary data */ |
| 64 | $result = $handler->handle($result); |
| 65 | } |
| 66 | |
| 67 | if ($result instanceof Response) { |
| 68 | return $result; |
| 69 | } |
| 70 | |
| 71 | if ($result instanceof ResponseWrapper) { |
| 72 | return $result->unwrap(); |
| 73 | } |
| 74 | |
| 75 | throw new RuntimeException( |
| 76 | 'Unable to determine a response handler for the returned value of the view', |
| 77 | ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * @template T of object |
| 82 | * @param ?class-string<T> $filter |
| 83 | * @return ($filter is null ? list<object> : list<T>) |
| 84 | */ |
| 85 | public function attributes(?string $filter = null): array |
| 86 | { |
| 87 | if (!isset($this->attributes)) { |
| 88 | if ($this->view instanceof Closure) { |
| 89 | $this->attributes = new AttributesResolver( |
| 90 | [new ReflectionFunction($this->view)], |
| 91 | $this->container, |
| 92 | ); |
| 93 | } else { |
| 94 | [$controller, $method] = $this->view; |
| 95 | $reflectionClass = new ReflectionClass($controller); |
| 96 | $this->attributes = new AttributesResolver([ |
| 97 | $reflectionClass, |
| 98 | $reflectionClass->getMethod($method), |
| 99 | ], $this->container); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | return $this->attributes->get($filter); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @param Closure|array<array-key, mixed>|string $view |
| 108 | * @return Closure|array{class-string, string} |
| 109 | */ |
| 110 | private function prepareView(callable|string|array $view): Closure|array |
| 111 | { |
| 112 | if (is_callable($view)) { |
| 113 | return Closure::fromCallable($view); |
| 114 | } |
| 115 | |
| 116 | if (is_array($view)) { |
| 117 | return $this->prepareControllerAction($view[0] ?? null, $view[1] ?? null); |
| 118 | } |
| 119 | |
| 120 | if (class_exists($view)) { |
| 121 | return $this->prepareControllerAction($view, '__invoke'); |
| 122 | } |
| 123 | |
| 124 | throw new RuntimeException( |
| 125 | 'Route action string is not callable: ' |
| 126 | . $view |
| 127 | . ". Use a callable, [Controller::class, 'method'], an invokable controller class, " |
| 128 | . 'or a controller group.', |
| 129 | ); |
| 130 | } |
| 131 | |
| 132 | /** @return array{class-string, string} */ |
| 133 | private function prepareControllerAction(mixed $controllerName, mixed $method): array |
| 134 | { |
| 135 | if ( |
| 136 | !is_string($controllerName) |
| 137 | || $controllerName === '' |
| 138 | || !is_string($method) |
| 139 | || $method === '' |
| 140 | ) { |
| 141 | throw new RuntimeException("Controller actions must use [Controller::class, 'method']."); |
| 142 | } |
| 143 | |
| 144 | if (!class_exists($controllerName)) { |
| 145 | throw new RuntimeException('Route controller not found: ' . $controllerName); |
| 146 | } |
| 147 | |
| 148 | if (!method_exists($controllerName, $method)) { |
| 149 | throw new RuntimeException('Route action method not found: ' . $controllerName . '::' . $method); |
| 150 | } |
| 151 | |
| 152 | return [$controllerName, $method]; |
| 153 | } |
| 154 | |
| 155 | private function getClosure(Request $request): Closure |
| 156 | { |
| 157 | if ($this->view instanceof Closure) { |
| 158 | return $this->view; |
| 159 | } |
| 160 | |
| 161 | [$controllerName, $method] = $this->view; |
| 162 | $rc = new ReflectionClass($controllerName); |
| 163 | $constructor = $rc->getConstructor(); |
| 164 | $args = $constructor ? $this->getArgs($constructor, $request) : []; |
| 165 | $controller = $rc->newInstance(...$args); |
| 166 | |
| 167 | if (is_callable([$controller, $method])) { |
| 168 | return Closure::fromCallable([$controller, $method]); |
| 169 | } |
| 170 | |
| 171 | throw new RuntimeException( |
| 172 | 'Route action method is not callable: ' . $controllerName . '::' . $method, |
| 173 | ); |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Determines the arguments passed to the view and/or controller constructor. |
| 178 | * |
| 179 | * - If a view parameter implements Request, the request will be passed. |
| 180 | * - If a view parameter is a subclass of Route, the route will be passed. |
| 181 | * - If names of the view parameters match names of the route arguments |
| 182 | * it will try to convert the argument to the parameter type and add it to |
| 183 | * the returned args list. |
| 184 | * - If the parameter is typed, try to resolve it via container or |
| 185 | * autowiring. |
| 186 | * - If parameter resolution fails and a default value exists, the default |
| 187 | * will be used. |
| 188 | * - Exceptions thrown while constructing dependencies bubble unchanged. |
| 189 | * - Otherwise fail. |
| 190 | * |
| 191 | * @return array<string, mixed> |
| 192 | * @psalm-suppress MixedAssignment -- $args values are mixed |
| 193 | */ |
| 194 | private function getArgs(ReflectionFunctionAbstract $rf, Request $request): array |
| 195 | { |
| 196 | $args = []; |
| 197 | $params = $rf->getParameters(); |
| 198 | $errMsg = 'View parameters cannot be resolved. Details: '; |
| 199 | |
| 200 | foreach ($params as $param) { |
| 201 | $name = $param->getName(); |
| 202 | $routeArgs = $this->match->params(); |
| 203 | |
| 204 | if (array_key_exists($name, $routeArgs)) { |
| 205 | $args[$name] = match ((string) $param->getType()) { |
| 206 | 'int' => is_numeric($routeArgs[$name]) |
| 207 | ? (int) $routeArgs[$name] |
| 208 | : throw new RuntimeException($errMsg . "Cannot cast '{$name}' to int"), |
| 209 | 'float' => is_numeric($routeArgs[$name]) |
| 210 | ? (float) $routeArgs[$name] |
| 211 | : throw new RuntimeException($errMsg . "Cannot cast '{$name}' to float"), |
| 212 | 'string' => $routeArgs[$name], |
| 213 | default => $this->resolveUnknown($param, $request, $errMsg), |
| 214 | }; |
| 215 | } else { |
| 216 | $args[$name] = $this->resolveUnknown($param, $request, $errMsg); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | assert(count($params) === count($args), 'Resolved argument count must match parameter count.'); |
| 221 | |
| 222 | return $args; |
| 223 | } |
| 224 | |
| 225 | private function resolveUnknown( |
| 226 | ReflectionParameter $param, |
| 227 | Request $request, |
| 228 | string $errMsg, |
| 229 | ): mixed { |
| 230 | try { |
| 231 | return $this->resolveParam($param, $request); |
| 232 | } catch (UnresolvableParameter|WireException $e) { |
| 233 | if ($param->isDefaultValueAvailable()) { |
| 234 | return $param->getDefaultValue(); |
| 235 | } |
| 236 | |
| 237 | throw new RuntimeException($errMsg . $e->getMessage(), $e->getCode(), $e); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | private function resolveParam(ReflectionParameter $param, Request $request): mixed |
| 242 | { |
| 243 | $type = $param->getType(); |
| 244 | |
| 245 | if ($type instanceof ReflectionNamedType) { |
| 246 | $typeName = $type->getName(); |
| 247 | |
| 248 | if ($typeName === Request::class || is_subclass_of($typeName, Request::class)) { |
| 249 | return $request; |
| 250 | } |
| 251 | |
| 252 | if ($typeName === Route::class || is_subclass_of($typeName, Route::class)) { |
| 253 | return $this->match->route(); |
| 254 | } |
| 255 | |
| 256 | if (!class_exists($typeName) && !interface_exists($typeName)) { |
| 257 | throw new UnresolvableParameter( |
| 258 | "Type '{$typeName}' is not a class or interface. Source: \n" . $this->paramInfo($param), |
| 259 | ); |
| 260 | } |
| 261 | |
| 262 | // Registered ids come from the container, which owns their lifetime. |
| 263 | return $this->creator->resolve($typeName, predefinedTypes: [Request::class => $request]); |
| 264 | } |
| 265 | if ($type) { |
| 266 | throw new UnresolvableParameter( |
| 267 | "Autowiring does not support union or intersection types. Source: \n" . $this->paramInfo($param), |
| 268 | ); |
| 269 | } |
| 270 | |
| 271 | throw new UnresolvableParameter( |
| 272 | "Autowired entities need to have typed constructor parameters. Source: \n" . $this->paramInfo($param), |
| 273 | ); |
| 274 | } |
| 275 | |
| 276 | public function paramInfo(ReflectionParameter $param): string |
| 277 | { |
| 278 | $type = $param->getType(); |
| 279 | $rf = $param->getDeclaringFunction(); |
| 280 | $rc = null; |
| 281 | |
| 282 | if ($rf instanceof ReflectionMethod) { |
| 283 | $rc = $rf->getDeclaringClass(); |
| 284 | } |
| 285 | |
| 286 | return ( |
| 287 | ($rc ? $rc->getName() . '::' : '') |
| 288 | . $rf->getName() |
| 289 | . '(..., ' |
| 290 | . ($type ? (string) $type . ' ' : '') |
| 291 | . '$' |
| 292 | . $param->getName() |
| 293 | . ', ...)' |
| 294 | ); |
| 295 | } |
| 296 | |
| 297 | /** @return list<Middleware> */ |
| 298 | public function middleware(): array |
| 299 | { |
| 300 | return array_merge( |
| 301 | $this->match->route()->getMiddleware(), |
| 302 | $this->attributes(Middleware::class), |
| 303 | ); |
| 304 | } |
| 305 | } |