Adding currency picker to laravel - php

Question

I want to have a drop-down in my navbar where I can select a currency and all the prices in my app convert to selected currency, I know I should use middle-ware for this matter but I don't know how to begin. I am using Fixer with laravel-swap as a package for exchange rates.
What I've done
I have made a middleware named it Currancy and it's content:
<?php
namespace App\Http\Middleware;
use Closure;
use Swap\Swap;
use Swap\Builder;
class Currancy
{
/**
* Handle an incoming request.
*
* #param \Illuminate\Http\Request $request
* #param \Closure $next
* #return mixed
*/
public function handle($request, Closure $next)
{
if (Session::has('appcurrency') AND array_key_exists(Session::get('appcurrency'), Config::get('currencies'))) {
$currency = Session::get('appcurrency');
App::setLocale($currency);
}
else {
App::setLocale(Config::get('app.currency'));
}
return $next($request);
}
}
I also made a currencies.php in config folder:
<?php
return [
'IDR' => [
'name' => 'Indunesian Rupiah',
],
'USD' => [
'name' => 'U.S Dollar',
],
'EUR' => [
'name' => 'Euro',
],
];
I also added this to my config\app.php
'currency' => 'IDR',
in that case my default currency is IDR unless user select others.
PS: for my middleware and config file I've got the idea of language
translation and I don't have an idea how to join it to SWAP package in
order to work! :\
Questions
Is the way I try to handle currencies correct way?
What else should I do for the next step?
thanks.

Answer 1

App::setLocale() is for language purpose.
Do not use a middle-ware to set a session default value. It will bloat your route file. Use the view composer for output. https://laravel.com/docs/4.2/responses#view-composers
Run this command if you do not have a view composer provider:
php artisan make:provider ComposerServiceProvider
In "app/Providers/ComposerServiceProvider.php", in the "boot()" method
public function boot()
{
View::composer(array('header','footer'), function($view)
{
if (!currentCurrency()) {
setCurrency(config('app.currency'));
}
$view->with('currencies', config('currencies');
});
}
Define some helper functions.
To load a helper, use the autoload feature of the composer.
In "composer.json" in the "autoload" attribute tight, after the "psr-4" one:
it will load "app/Support/helpers.php" as an example.
"psr-4": {
"App\\": "app/"
},
"files": [
"app/Support/helpers.php"
]
After changing "composer.json", regenerate the autoload file with the command:
composer dump-autoload
In "app/Support/helpers.php" (create it) add these functions:
<?php
if (!function_exists('currentCurrency')) {
/**
* #return string
*/
function currentCurrency(){
if (Session::has('appcurrency') AND array_key_exists(Session::get('appcurrency'), config('currencies'))) {
return Session::get('appcurrency');
}
return '';
}
}
if (!function_exists('setCurrency')) {
/**
* #param string $currency
* #return void
* #throws \Exception
*/
function setCurrency($currency){
if (array_key_exists($currency, config('currencies'))) {
Session::set('appcurrency', $currency);
} else {
throw new \Exception('not a valid currency');
}
}
}
If you need to set the locale to one of the currency, change the "setCurrency" method, since you only need to set the locale once per session.
/**
* #param string $currency
* #return void
* #throws \Exception
*/
function setCurrency($currency){
if (array_key_exists($currency, config('currencies'))) {
Session::set('appcurrency', $currency);
App::setLocale($currency);
} else {
throw new \Exception('not a valid currency');
}
}