加入切換語系的機制，加入紀錄網站狀態的全域物件及相關設定機制

app/Http/Kernel.php

@@ -35,11 +35,14 @@ class Kernel extends HttpKernel
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \App\Http\Middleware\VerifyCsrfToken::class,
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
+            \App\Http\Middleware\SetAppLanguage::class,
+            \App\Http\Middleware\SetSiteStates::class,
         ],
 
         'api' => [
             'throttle:60,1',
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
+            \App\Http\Middleware\SetSiteStates::class,
         ],
     ];
 
@@ -79,5 +82,6 @@ class Kernel extends HttpKernel
         \Illuminate\Session\Middleware\AuthenticateSession::class,
         \Illuminate\Routing\Middleware\SubstituteBindings::class,
         \Illuminate\Auth\Middleware\Authorize::class,
+        \App\Http\Middleware\SetAppLanguage::class,
     ];
 }

app/Http/Middleware/SetAppLanguage.php

@@ -0,0 +1,106 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+/**
+ * 設定網站語系
+ *
+ * Class SetAppLanguage
+ * @package App\Http\Middleware
+ */
+class SetAppLanguage
+{
+    /**
+     * Cookie及Session存放Locale資訊的Key
+     *
+     * @var string
+     */
+    private $cookieAndSessionKey = 'appLocale';
+
+    /**
+     * 設定Locale時的參數Key
+     *
+     * @var string
+     */
+    private $localeRequestKey = 'locale';
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        //取得所有語言清單
+        $availableLocales = (array)config('languages');
+        //要被回傳的Cookie
+        $setLocaleCookie = false;
+        //要被設定的語言
+        $setLocale = false;
+        //如果有Locale參數
+        if($request->get($this->localeRequestKey) !== null) {
+            //取得傳入的Locale值
+            $requestLocale = $request->get($this->localeRequestKey);
+            //如果有在語言清單內
+            if(array_key_exists($requestLocale, $availableLocales)) {
+                //設定session
+                $request->session()->put($this->cookieAndSessionKey, $requestLocale);
+                //設定要被回傳的Cookie及目標Locale
+                $setLocale = $setLocaleCookie = $requestLocale;
+            }
+        }
+        //假如沒有目標Locale，再讀取Session、Cookie、瀏覽器的Locale
+        if(!$setLocale) {
+            $cookieLocale = $request->cookies->get($this->cookieAndSessionKey);
+            $sessionLocale = $request->session()->get($this->cookieAndSessionKey);
+            if(array_key_exists($sessionLocale, $availableLocales)) {
+                //設定要被回傳的Cookie及目標Locale
+                $setLocale = $sessionLocale;
+                if(!$cookieLocale) {
+                    $setLocaleCookie = $sessionLocale;
+                }
+            } elseif(array_key_exists($cookieLocale, $availableLocales)) {
+                //設定Session及目標Locale
+                $request->session()->put($this->cookieAndSessionKey, $cookieLocale);
+                $setLocale = $cookieLocale;
+            } else {
+                //Session及Cookie都沒有Locale值時，讀取HTTP Header的資訊
+                $browserLocales = $request->server('HTTP_ACCEPT_LANGUAGE');
+                $browserLocales = preg_replace('/;q=0\.\d+/', '', $browserLocales);
+                $browserLocales = explode(',', $browserLocales);
+                $browserLocales = array_map(function($lang){
+                    return strtolower($lang);
+                }, $browserLocales);
+
+                //與語言清單比對
+                $validBrowserLocales = array_intersect($browserLocales, array_keys($availableLocales));
+
+                if(!empty($validBrowserLocales)) {
+                    //取得第一個瀏覽器Locale
+                    $validBrowserLocale = head($validBrowserLocales);
+                    //設定Session及目標Locale
+                    $request->session()->put($this->cookieAndSessionKey, $validBrowserLocale);
+                    $setLocale = $setLocaleCookie = $validBrowserLocale;
+                }
+            }
+        }
+
+        if($setLocale) {
+            //如果有目標Locale
+            app()->setLocale($setLocale);
+        } else {
+            //如果沒有目標Locale，則設定成預設語言
+            app()->setLocale(config('app.fallback_locale'));
+        }
+
+        //如果有Cookie，則帶入request
+        if($setLocaleCookie) {
+            return $next($request)->withCookie(cookie()->forever($this->cookieAndSessionKey, $setLocaleCookie));
+        } else {
+            return $next($request);
+        }
+    }
+}

app/Http/Middleware/SetSiteStates.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Services\SiteStateService;
+use Closure;
+
+/**
+ * 設定SiteStateService中的資料
+ *
+ * Class SetSiteStates
+ * @package App\Http\Middleware
+ */
+class SetSiteStates
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        $siteState = app(SiteStateService::class);
+        //是否網站後台，判斷route prefix
+        if($request->is(config('admin.route') . '/*')) {
+            $siteState->isAdminArea = true;
+        }
+
+        //所有可用語系及其原文名稱
+        $siteState->languagesWithLabel = config('languages');
+
+        //所有可用語系
+        $siteState->languages = array_keys($siteState->languagesWithLabel);
+
+        //所有其他可用語系，排除現在語系
+        $siteState->otherLanguages = collect($siteState->languages)->filter(function($locale){
+            return $locale !== app()->getLocale();
+        })->all();
+
+        //所有語系的當前語言翻譯
+        foreach ($siteState->languages as $locale) {
+            $siteState->languageTranslations[$locale] = trans('languages.' . $locale);
+        }
+
+        //預設語系
+        $siteState->defaultLanguage = config('app.fallback_locale');
+
+        return $next($request);
+    }
+}

app/Presenters/UrlPresenter.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Presenters;
+
+use Illuminate\Http\Request;
+
+class UrlPresenter
+{
+    private $request;
+
+    public function __construct(Request $request)
+    {
+        $this->request = $request;
+    }
+
+    public function appendLocale($locale)
+    {
+        $url = $this->request->fullUrlWithQuery(['locale' => $locale]);
+        return $url;
+    }
+}

app/Providers/SingletonServiceProvider.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Providers;
+
+use App\Option;
+use Illuminate\Support\ServiceProvider;
+
+/**
+ * 初始化所有singleton class 的 instance
+ *
+ * Class SingletonServiceProvider
+ * @package App\Providers
+ */
+class SingletonServiceProvider extends ServiceProvider
+{
+    /**
+     * Register services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        // Services
+        $this->app->alias(\App\Services\SiteStateService::class, 'SiteState');
+        $this->app->singleton(\App\Services\SiteStateService::class, function($app){
+            return new \App\Services\SiteStateService;
+        });
+    }
+
+    /**
+     * Bootstrap services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        //
+    }
+}

app/Services/SiteStateService.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace App\Services;
+
+/**
+ * 紀錄全域的網站狀態
+ *
+ * Class SiteStateService
+ * @package App\Services
+ */
+class SiteStateService
+{
+    /**
+     * 是否為後台
+     *
+     * @var bool
+     */
+    public $isAdminArea = false;
+
+    /**
+     * 所有可用語系
+     *
+     * @var array
+     */
+    public $languages = [];
+
+    /**
+     * 所有其他可用語系，排除現在語系
+     *
+     * @var array
+     */
+    public $otherLanguages = [];
+
+    /**
+     * 所有可用語系及其原文名稱
+     *
+     * @var array
+     */
+    public $languagesWithLabel = [];
+
+    /**
+     * 所有語系的當前語言翻譯
+     *
+     * @var array
+     */
+    public $languageTranslations = [];
+
+    /**
+     * 預設語系
+     *
+     * @var string
+     */
+    public $defaultLanguage = '';
+
+    /**
+     * 取得所有變數
+     *
+     * @return array
+     */
+    public function getAll()
+    {
+        return get_object_vars($this);
+    }
+}

config/app.php

@@ -175,7 +175,7 @@ return [
         // App\Providers\BroadcastServiceProvider::class,
         App\Providers\EventServiceProvider::class,
         App\Providers\RouteServiceProvider::class,
-
+        App\Providers\SingletonServiceProvider::class,
     ],
 
     /*

config/languages.php

@@ -0,0 +1,8 @@
+<?php
+return [
+    'en' => 'English',
+    'zh-tw' => '繁體中文',
+    'zh-cn' => '简体中文',
+    'ja' => '日本語',
+    'ko' => '한국어'
+];

resources/js/admin/app.js

@@ -1 +1,2 @@
 import './lib';
+import '../app-common'

resources/js/app-common.js

@@ -0,0 +1,4 @@
+$('.logout-btn').on('click', e => {
+    e.preventDefault()
+    $('#logout-form').submit()
+})

resources/js/app.js

@@ -1 +1,2 @@
-require('./bootstrap');
+import './lib'
+import './app-common'

resources/views/admin/layouts/app.blade.php

@@ -31,6 +31,7 @@
             </li>
         </ul>
         <ul class="nav navbar-nav ml-auto">
+            @component('components.languageDropdown')@endcomponent
         </ul>
 
         <button class="navbar-toggler aside-menu-toggler d-md-down-none" type="button" data-toggle="aside-menu-lg-show">

resources/views/components/languageDropdown.blade.php

@@ -0,0 +1,9 @@
+@inject('url', App\Presenters\UrlPresenter)
+<li class="nav-item dropdown">
+    <a href="#" class="nav-link btn-icon dropdown-toggle switch-language" data-toggle="dropdown" role="button" aria-expanded="false" aria-haspopup="true">{{ app('SiteState')->languagesWithLabel[app()->getLocale()] }}</a>
+    <div class="dropdown-menu dropdown-menu-right">
+        @foreach (app('SiteState')->otherLanguages as $locale)
+            <a href="{{ $url->appendLocale($locale) }}" class="dropdown-item">{{ app('SiteState')->languagesWithLabel[$locale] }}</a>
+        @endforeach
+    </div>
+</li>

resources/views/components/nav.blade.php

@@ -26,24 +26,14 @@
                         </li>
                     @endif
                 @else
-                    <li class="nav-item dropdown">
-                        <a id="navbarDropdown" class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" v-pre>
-                            {{ Auth::user()->name }} <span class="caret"></span>
-                        </a>
-
-                        <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdown">
-                            <a class="dropdown-item" href="{{ route('logout') }}"
-                               onclick="event.preventDefault();
-                                                     document.getElementById('logout-form').submit();">
-                                {{ __('Logout') }}
-                            </a>
-
-                            <form id="logout-form" action="{{ route('logout') }}" method="POST" style="display: none;">
-                                @csrf
-                            </form>
-                        </div>
+                    <li class="nav-item">
+                        <a class="nav-link logout-btn" href="#">{{ __('Logout') }}</a>
+                        <form id="logout-form" action="{{ route('logout') }}" method="post" style="display: none;">
+                            @csrf
+                        </form>
                     </li>
                 @endguest
+                @include('components.languageDropdown')
             </ul>
         </div>
     </div>