From 7e71b46e02b93ec548c32948d72547a0aadb62c8 Mon Sep 17 00:00:00 2001
From: Nabeel Shahzad <nshahzad@gmail.com>
Date: Tue, 9 Jan 2018 23:05:52 -0600
Subject: [PATCH] Enable ATTR_EMULATE_PREPARES for MariaDB specifically #132

---
 app/Console/Commands/DevCommands.php          | 26 +++++++++++---
 config/database.php                           |  2 +-
 .../Resources/views/stubs/env.blade.php       |  1 +
 .../Installer/Services/EnvironmentService.php | 34 ++++++++++++++++---
 4 files changed, 53 insertions(+), 10 deletions(-)

diff --git a/app/Console/Commands/DevCommands.php b/app/Console/Commands/DevCommands.php
index 3146934f..31f0f0f9 100644
--- a/app/Console/Commands/DevCommands.php
+++ b/app/Console/Commands/DevCommands.php
@@ -2,12 +2,11 @@
 
 namespace App\Console\Commands;
 
-use App\Models\Airline;
-use App\Models\Permission;
-use App\Models\Role;
-use App\Models\User;
-use App\Services\DatabaseService;
 use DB;
+use PDO;
+
+use App\Models\Airline;
+use App\Models\User;
 
 use App\Console\BaseCommand;
 use App\Models\Acars;
@@ -34,6 +33,7 @@ class DevCommands extends BaseCommand
             'clear-acars' => 'clearAcars',
             'clear-users' => 'clearUsers',
             'compile-assets' => 'compileAssets',
+            'db-attrs' => 'dbAttrs',
         ];
 
         if(!array_key_exists($command, $commands)) {
@@ -92,4 +92,20 @@ class DevCommands extends BaseCommand
         $this->runCommand('npm update');
         $this->runCommand('npm run dev');
     }
+
+    /**
+     * Output DB prepares versions
+     */
+    protected function dbAttrs()
+    {
+        $pdo = DB::connection()->getPdo();
+        $emulate_prepares_below_version = '5.1.17';
+        $server_version = $pdo->getAttribute(PDO::ATTR_SERVER_VERSION);
+        $emulate_prepares = version_compare($server_version, $emulate_prepares_below_version, '<');
+
+        $this->info('Server Version: '. $server_version);
+        $this->info('Emulate Prepares: '.$emulate_prepares);
+
+        $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, $emulate_prepares);
+    }
 }
diff --git a/config/database.php b/config/database.php
index 0e71c0ba..1ca9134c 100755
--- a/config/database.php
+++ b/config/database.php
@@ -19,7 +19,7 @@ return [
             'strict' => false,
             'engine' => null,
             'options' => [
-                PDO::ATTR_EMULATE_PREPARES => false,
+                PDO::ATTR_EMULATE_PREPARES => env('DB_EMULATE_PREPARES', false),
                 #PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
             ],
         ],
diff --git a/modules/Installer/Resources/views/stubs/env.blade.php b/modules/Installer/Resources/views/stubs/env.blade.php
index ca093249..32111a22 100644
--- a/modules/Installer/Resources/views/stubs/env.blade.php
+++ b/modules/Installer/Resources/views/stubs/env.blade.php
@@ -25,6 +25,7 @@ DB_PORT={!! $DB_PORT !!}
 DB_DATABASE={!! $DB_NAME !!}
 DB_USERNAME={!! $DB_USER !!}
 DB_PASSWORD={!! $DB_PASS !!}
+DB_EMULATE_PREPARES={!! $DB_EMULATE_PREPARES !!}
 DB_PREFIX=
 
 MAIL_DRIVER=smtp
diff --git a/modules/Installer/Services/EnvironmentService.php b/modules/Installer/Services/EnvironmentService.php
index d07a6a71..be546b1b 100644
--- a/modules/Installer/Services/EnvironmentService.php
+++ b/modules/Installer/Services/EnvironmentService.php
@@ -2,18 +2,21 @@
 
 namespace Modules\Installer\Services;
 
-use Illuminate\Encryption\Encrypter;
 use Log;
-use Symfony\Component\Filesystem\Exception\IOException;
+use PDO;
+use Illuminate\Encryption\Encrypter;
 use Symfony\Component\HttpFoundation\File\Exception\FileException;
-use Symfony\Component\Filesystem\Filesystem;
-use Symfony\Component\Filesystem\Exception\IOExceptionInterface;
 
+/**
+ * Class EnvironmentService
+ * @package Modules\Installer\Services
+ */
 class EnvironmentService
 {
     /**
      * Create the .env file
      * @return boolean
+     * @throws \Symfony\Component\HttpFoundation\File\Exception\FileException
      */
     public function createEnvFile($driver, $host, $port, $name, $user, $pass)
     {
@@ -26,6 +29,7 @@ class EnvironmentService
             'DB_NAME' => $name,
             'DB_USER' => $user,
             'DB_PASS' => $pass,
+            'DB_EMULATE_PREPARES' => false,
         ];
 
         $opts = $this->getCacheDriver($opts);
@@ -45,6 +49,28 @@ class EnvironmentService
         return base64_encode(Encrypter::generateKey(config('app.cipher')));
     }
 
+    /**
+     * @param $opts
+     * @return mixed
+     */
+    protected function determinePdoOptions($opts)
+    {
+        $dsn = "mysql:host=$opts[DB_HOST];port=$opts[DB_PORT];";
+        Log::info('Connection string: ' . $dsn);
+
+        $conn = new PDO($dsn, $opts['DB_USER'], $opts['DB_PASS']);
+        $version = strtolower($conn->getAttribute(PDO::ATTR_SERVER_VERSION));
+
+        # If it's mariadb, enable the emulation for prepared statements
+        # seems to be throwing a problem on 000webhost
+        # https://github.com/nabeelio/phpvms/issues/132
+        if(strpos($version, 'mariadb') !== false) {
+            $opts['DB_EMULATE_PREPARES'] = true;
+        }
+
+        return $opts;
+    }
+
     /**
      * Determine is APC is installed, if so, then use it as a cache driver
      * @param $opts