The first commit

.htaccess

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+DirectoryIndex index.php index.html .ht
+
+<FilesMatch "^composer|^autoload|^cli-config|^COPYING|\.(ini|lock|dist|git|sh|bak|swp)$">
+    order allow,deny
+    deny from all
+</FilesMatch>
+
+<Files ~ "index.php|index_dev.php">
+    order deny,allow
+    allow from all
+</Files>
+
+<IfModule mod_rewrite.c>
+    RewriteEngine On
+
+    # Authorization ヘッダが取得できない環境への対応
+    RewriteCond %{HTTP:Authorization} ^(.*)
+    RewriteRule ^(.*) - [E=HTTP_AUTHORIZATION:%1]
+
+    # さくらのレンタルサーバでサイトへのアクセスをSSL経由に制限する場合の対応
+    # RewriteCond %{HTTP:x-sakura-forwarded-for} !^$
+    # RewriteRule ^(.*) - [E=HTTPS:on]
+
+    RewriteCond %{REQUEST_FILENAME} !-f
+    RewriteCond %{REQUEST_FILENAME} !^(.*)\.(gif|png|jpe?g|css|ico|js|svg)$ [NC]
+    RewriteRule ^(.*)$ index.php [QSA,L]
+</IfModule>

app/.htaccess

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+order allow,deny
+deny from all

app/Plugin/HelloWorld/ServiceProvider/HelloWorldServiceProvider.php

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+<?php
+
+namespace Plugin\HelloWorld\ServiceProvider;
+
+use Silex\Application as BaseApplication;
+use Silex\ServiceProviderInterface;
+use Eccube\Common\Constant;
+
+
+// include log functions (for 3.0.0 - 3.0.11)
+require_once __DIR__.'/../log.php';
+
+/**
+ * Class HelloWorldServiceProvider
+ */
+class HelloWorldServiceProvider implements ServiceProviderInterface {
+    /**
+     * register.
+     *
+     * @param BaseApplication $app
+     */
+    public function register(BaseApplication $app) {
+        // 管理画面定義
+        $admin = $app['controllers_factory'];
+        // 強制SSL
+        if ($app['config']['force_ssl'] == Constant::ENABLED) {
+            $admin->requireHttps();
+        }
+
+        $app->mount('/'.trim($app['config']['admin_route'], '/').'/', $admin);
+
+        // Serviceの定義
+        $app['salesreport.service.sales_report'] = $app->share(function () use ($app) {
+            return new SalesReportService($app);
+        });
+
+        // initialize logger (for 3.0.0 - 3.0.8)
+        if (!method_exists('Eccube\Application', 'getInstance')) {
+            eccube_log_init($app);
+        }
+
+        // サブナビの拡張
+        $app['config'] = $app->share($app->extend('config', function ($config) {
+            $nav = array(
+                'id' => 'admin_plugin_helloworld',
+                'name' => 'Hello World',
+                'has_child' => 'true',
+                'icon' => 'cb-chart',
+                'child' => array(
+                    array(
+                        'id' => 'admin_plugin_helloword_test',
+                        'url' => 'admin_plugin_helloword_test',
+                        'name' => 'Test',
+                    ),
+                ),
+            );
+
+            $config['nav'][] = $nav;
+
+            return $config;
+    }
+
+    /**
+     * boot.
+     *
+     * @param BaseApplication $app
+     */
+    public function boot(BaseApplication $app)
+    {
+    }
+}

app/Plugin/HelloWorld/config.yml

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+name: HDK Hello World
+code: HelloWorld
+version: 1.0.0
+service:
+    - HelloWorldServiceProvider
+const:
+    product_maximum_display: 20

app/Plugin/HelloWorld/log.php

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+<?php
+/*
+ * This file is part of the Sales Report plugin
+ *
+ * Copyright (C) 2016 LOCKON CO.,LTD. All Rights Reserved.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+use Plugin\SalesReport\Util\Version;
+
+if (Version::isSupportLogFunction()) {
+    return;
+}
+if (function_exists('log_emergency') === false) {
+    /**
+     * Log emergency.
+     * Urgent alert. System is unusable.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_emergency($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->emergency($message, $context);
+        }
+    }
+}
+if (function_exists('log_alert') === false) {
+    /**
+     * Log alert.
+     * Action must be taken immediately.
+     *
+     * Entire website down, database unavailable, etc. This should trigger the SMS alerts and wake you up.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_alert($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->alert($message, $context);
+        }
+    }
+}
+if (function_exists('log_critical') === false) {
+    /**
+     * Log critical.
+     * Critical conditions.
+     *
+     * Application component unavailable, unexpected exception.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_critical($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->critical($message, $context);
+        }
+    }
+}
+if (function_exists('log_error') === false) {
+    /**
+     * Log error.
+     * Runtime errors that do not require immediate action but should typically be logged and monitored.
+     *
+     * Error content at the time of occurrence Exception.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_error($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->error($message, $context);
+        }
+    }
+}
+if (function_exists('log_warning') === false) {
+    /**
+     * Log warning.
+     * Exceptional occurrences that are not errors.
+     *
+     * Use of deprecated APIs, poor use of an API, undesirable things that are not necessarily wrong.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_warning($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->warning($message, $context);
+        }
+    }
+}
+if (function_exists('log_notice') === false) {
+    /**
+     * Log notice.
+     * Normal but significant events.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_notice($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->notice($message, $context);
+        }
+    }
+}
+if (function_exists('log_info') === false) {
+    /**
+     * Log info.
+     * Interesting events.
+     *
+     * Logging to confirm the operation was performed.
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_info($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->info($message, $context);
+        }
+    }
+}
+if (function_exists('log_debug') === false) {
+    /**
+     * Log debug.
+     * Detailed debug information.
+     *
+     * HTTP communication log.
+     * Log you want to output at the time of development
+     *
+     * @param string $message
+     * @param array  $context
+     */
+    function log_debug($message, array $context = array())
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            $GLOBALS['eccube_logger']->debug($message, $context);
+        }
+    }
+}
+if (function_exists('eccube_log_init') === false) {
+    /**
+     * Init log function for ec-cube <= 3.0.8.
+     *
+     * @param object $app
+     */
+    function eccube_log_init($app)
+    {
+        if (isset($GLOBALS['eccube_logger'])) {
+            return;
+        }
+        $GLOBALS['eccube_logger'] = $app['monolog'];
+        $app['eccube.monolog.factory'] = $app->protect(function ($config) use ($app) {
+            return $app['monolog'];
+        });
+    }
+}
+// 3.0.9以上の場合は初期化処理を行う.
+if (method_exists('Eccube\Application', 'getInstance')) {
+    $app = \Eccube\Application::getInstance();
+    eccube_log_init($app);
+}