Laravel學(xué)習(xí)筆記之Route,Middleware和Controller參數(shù)傳遞

zhangyucha0 發(fā)布于2019-06-27 14:42 / 2415人閱讀

摘要：本文主要學(xué)習(xí)總結(jié)下間參數(shù)傳遞。開發(fā)時(shí)經(jīng)常碰到類似場(chǎng)景有時(shí)需要在中讀取中設(shè)置的和，有時(shí)也需要在中讀取中設(shè)置的參數(shù)。總結(jié)下這幾個(gè)知識(shí)點(diǎn)，便于查閱。

本文主要學(xué)習(xí)總結(jié)下Route,Middleware,Controller間參數(shù)傳遞。開發(fā)時(shí)經(jīng)常碰到類似場(chǎng)景：有時(shí)需要在Middleware中讀取Route中設(shè)置的middleware parameter和route parameter，有時(shí)也需要在Controller@Action中讀取Middleware中設(shè)置的參數(shù)。

先假設(shè)路由是：

Route::group(["prefix" => "route", "namespace" => "RouteParameter"], function () {

    // route/user/{user}/role/{role}, route parameter是{user}, {role}
    Route::group(["middleware" => "route.parameter"], function () {
        Route::resource("user.role", "RouteParameterToMiddlewareController");
    });

    // route/advisor, middleware parameter是 "advisor", "show", "comment"
    Route::group(["middleware" => "middleware.parameter:advisor,show,comment"], function () {
        Route::resource("advisor", "MiddlewareParameterToMiddlewareController");
    });
    
    // /route/controller, middleware parameter是 "client"
    Route::group(["middleware" => "middleware.controller:client"], function () {
        Route::resource("controller", "MiddlewareToController");
    });
});

路由對(duì)應(yīng)的控制器是：

namespace AppHttpControllersRouteParameter;

use IlluminateHttpRequest;
use AppHttpControllersController;

class RouteParameterToMiddlewareController extends Controller
{
    public function show($user, $role)
    {
        
    }
}


namespace AppHttpControllersRouteParameter;

use IlluminateHttpRequest;
use AppHttpControllersController;

class MiddlewareParameterToMiddlewareController extends Controller
{
    public function index()
    {
        return "All";
    }
}

并且在Kernel.php中注冊(cè)中間件：

$routeMiddlewares = []
    ...
    
    "route.parameter"       => AppHttpMiddlewareRouteParameter::class,
    "middleware.parameter"  => AppHttpMiddlewareMiddlewareParameter::class,
    "middleware.controller" => AppHttpMiddlewareControllerParameter::class,
;

Passing Route Parameters to Middleware

在中間件route.parameter中讀取路由參數(shù)有三種方式：$request->route($parameter_name);$request->route()->parameter($parameter_name);$request->route()->parameters()，代碼如下：

route("user");
        $user = $request->route()->parameter("user"); // {user}
        $role = $request->route()->parameter("role"); // {role}
        dd($user, $role);
        $parameters = $request->route()->parameters(); // ["user" => {user}, "role" => {role}]
        dd($parameters["user"], $parameters["role"]);

        return $next($request);
    }
}

Passing Middleware Parameters to Middleware

在中間件middleware.parameter中讀取中間件參數(shù)只需要在handle()中映射上對(duì)應(yīng)的參數(shù)變量就行，就和在Controller@Action中獲取路由參數(shù)一樣：

namespace AppHttpMiddleware;

use Auth;
use Closure;
use IlluminateHttpResponse;

class MiddlewareParameter
{
    /**
     * Handle an incoming request.
     *
     * @param  IlluminateHttpRequest $request
     * @param  Closure                 $next
     * @param                           $role
     * @param                           $action
     * @param                           $data
     *
     * @return mixed
     */
    public function handle($request, Closure $next, $role, $action, $data)
    {
        dd($role, $action, $data); // "advisor", "show", "comment"

        if (Auth::check() && (Auth::user()->type === $role)) {
            return $next($request);
        }

        return abort(Response::HTTP_UNAUTHORIZED, "You must log in to access the resource.", [
            "Set-Cookie" => "Laravel=0; path=/; Expires=Thu, 01-Jan-1970 00:00:00 GMT; Secure",
        ]);
    }
}

Passing Parameters in Middleware to Controller

有時(shí)需要在中間中把參數(shù)傳遞到控制器中，則可以通過Request對(duì)象作為傳輸管道，代碼如：

namespace AppHttpMiddleware;

use Closure;

class ControllerParameter
{
    /**
     * Handle an incoming request.
     *
     * @param  IlluminateHttpRequest  $request
     * @param  Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next, $role)
    {
        $request->attributes->add(compact("role")); // "client"
        return $next($request);
    }
}

控制器中使用Request對(duì)象獲取$role參數(shù)：

namespace AppHttpControllersRouteParameter;

use IlluminateHttpRequest;
use AppHttpControllersController;

class MiddlewareToController extends Controller
{
    public function index(Request $request)
    {
        dd($request->get("role"));
    }
}

總結(jié)：Route,Middleware,Controller之間傳遞參數(shù)這個(gè)知識(shí)點(diǎn)會(huì)經(jīng)常在設(shè)計(jì)代碼時(shí)用到，還有從Route中傳遞參數(shù)到Controller中，這個(gè)就更是經(jīng)常要用到的，也簡(jiǎn)單。總結(jié)下這幾個(gè)知識(shí)點(diǎn)，便于查閱。

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