First Commit

.gitignore

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+vendor
+composer.lock
+.idea

composer.json

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+{
+  "name": "rdehnhardt/excahnge-rate",
+  "description": "Performs currency conversion automatically based on api fixer.io",
+  "type": "library",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Renato Dehnhardt",
+      "email": "[email protected]"
+    }
+  ],
+  "require": {
+    "guzzlehttp/guzzle": "~6.0"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^6.3"
+  },
+  "autoload": {
+    "psr-4": {
+      "Rdehnhardt\\ExchangeRate\\": "src/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Tests\\": "tests/"
+    }
+  },
+  "scripts": {
+    "test": "vendor/bin/phpunit"
+  }
+}

phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    backupGlobals="false"
+    backupStaticAttributes="false"
+    bootstrap="vendor/autoload.php"
+    colors="true"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    processIsolation="false"
+    stopOnFailure="false"
+    syntaxCheck="false">
+    <testsuites>
+        <testsuite name="Package Test Suite">
+            <directory suffix=".php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

readme.md

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+# Exchange Rate
+
+Performs currency conversion automatically based on api fixer.io
+
+### Instalation
+
+```
+composer require rdehnhardt/exchange-rate
+```
+
+### How to use (automatically)
+```
+use Rdehnhardt\ExchangeRate\Exchange;
+
+$exchange = new Exchange();
+$exchange->rate(10, 'EUR', 'USD'); // 11,933 - at 2017-09-12
+```
+
+### How to use (manually)
+```
+use Rdehnhardt\ExchangeRate\Exchange;
+
+$exchange = new Exchange();
+$exchange->rate(10, 'EUR', 'USD', 1.2987); // 12,987
+```

src/Exceptions/NotFoundException.php

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+<?php
+
+namespace Rdehnhardt\ExchangeRate\Excaptions;
+
+use InvalidArgumentException as Exception;
+
+class NotFoundException extends Exception
+{
+}

src/Exchange.php

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+<?php
+
+namespace Rdehnhardt\ExchangeRate;
+
+class Exchange
+{
+    /**
+     * @var Fixer
+     */
+    private $fixer;
+
+    /**
+     * Exchange constructor.
+     * @param Fixer $fixer
+     */
+    public function __construct(Fixer $fixer = null)
+    {
+        if ($fixer === null) {
+            $fixer = new Fixer();
+        }
+
+        $this->fixer = $fixer;
+    }
+
+    /**
+     * @param $amount
+     * @param $from
+     * @param $to
+     * @param null $rate
+     * @return int
+     * @throws \Rdehnhardt\ExchangeRate\Excaptions\NotFoundException
+     */
+    public function rate($amount, $from, $to, $rate = null)
+    {
+        if ($rate === null) {
+            $rate = $this->fixer->get($from, $to);
+        }
+
+        return $amount * $rate;
+    }
+}

src/Fixer.php

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+<?php
+
+namespace Rdehnhardt\ExchangeRate;
+
+use GuzzleHttp\Client;
+use Rdehnhardt\ExchangeRate\Excaptions\NotFoundException;
+
+class Fixer
+{
+    /**
+     * @var array
+     */
+    private $rates;
+
+    /**
+     * @param string $from
+     * @param string $to
+     * @return mixed
+     */
+    public function get($from, $to)
+    {
+        $this->getRates($from);
+
+        if (!array_key_exists(strtoupper($to), $this->rates[$from])) {
+            throw new NotFoundException("Exchange rate '$to' not found.");
+        }
+
+        return $this->rates[$from][strtoupper($to)];
+    }
+
+    /**
+     * @param string $from
+     */
+    private function getRates($from)
+    {
+        if (!$this->rates[$from]) {
+            $response = (new Client())->get("http://api.fixer.io/latest?base={$from}");
+            $this->rates[$from] = json_decode($response->getBody(), true)['rates'];
+        }
+    }
+
+    /**
+     * @param string $from
+     * @param array $rates
+     */
+    public function setRates($from, $rates)
+    {
+        $this->rates[$from] = $rates;
+    }
+}

tests/ExchangeRate/ExchangeTest.php

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+<?php
+
+namespace Tests\ExchangeRate;
+
+use Rdehnhardt\ExchangeRate\Exchange;
+use Tests\TestCase;
+
+class ExchangeTest extends TestCase
+{
+    /**
+     * @dataProvider getData
+     * @param $from
+     * @param $to
+     * @param $amount
+     * @param $rate
+     * @param $expected
+     */
+    public function testExchangeRate($amount, $from, $to, $rate, $expected)
+    {
+        $exchange = new Exchange($this->fixer($from));
+
+        $this->assertEquals($expected, $exchange->rate($amount, $from, $to, $rate));
+    }
+
+    public function getData()
+    {
+        return [
+            [1, 'EUR', 'AUD', null, 1.4915],
+            [1, 'EUR', 'BGN', 1.9558, 1.9558],
+            [1, 'EUR', 'BRL', null, 3.7057],
+            [1, 'EUR', 'CAD', 1.4477, 1.4477],
+            [1, 'EUR', 'CHF', 1.1444, 1.1444],
+            [1, 'EUR', 'CNY', 7.8024, 7.8024],
+            [1, 'EUR', 'CZK', 26.105, 26.105],
+            [1, 'EUR', 'DKK', null, 7.4397],
+            [1, 'EUR', 'GBP', 0.89878, 0.89878],
+            [1, 'EUR', 'HKD', 9.3235, 9.3235],
+            [1, 'EUR', 'HRK', 7.4513, 7.4513],
+            [1, 'EUR', 'HUF', 307.11, 307.11],
+            [1, 'EUR', 'IDR', null, 15791.0],
+            [1, 'EUR', 'ILS', 4.2197, 4.2197],
+            [1, 'EUR', 'INR', 76.438, 76.438],
+            [1, 'EUR', 'JPY', 130.93, 130.93],
+            [1, 'EUR', 'KRW', 1346.0, 1346.0],
+            [1, 'EUR', 'MXN', null, 21.214],
+            [1, 'EUR', 'MYR', null, 5.0357],
+            [1, 'EUR', 'NOK', 9.3593, 9.3593],
+            [1, 'EUR', 'NZD', 1.6343, 1.6343],
+            [1, 'EUR', 'PHP', null, 60.99],
+            [1, 'EUR', 'PLN', 4.2549, 4.2549],
+            [1, 'EUR', 'RON', 4.6018, 4.6018],
+            [1, 'EUR', 'RUB', 68.384, 68.384],
+            [1, 'EUR', 'SEK', null, 9.5705],
+            [1, 'EUR', 'SGD', 1.6074, 1.6074],
+            [1, 'EUR', 'THB', 39.522, 39.522],
+            [1, 'EUR', 'TRY', 4.0948, 4.0948],
+            [1, 'EUR', 'USD', 1.1933, 1.1933],
+            [1, 'EUR', 'ZAR', null, 15.514],
+        ];
+    }
+}

tests/ExchangeRate/FixerTest.php

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+<?php
+
+namespace Tests\ExchangeRate;
+
+use Tests\TestCase;
+
+class FixerTest extends TestCase
+{
+    /**
+     * @dataProvider dataForTests
+     * @param $from
+     * @param $to
+     * @param $expected
+     */
+    public function testGetExchangeRate($from, $to, $expected)
+    {
+        $this->assertEquals($expected, $this->fixer($from)->get($from, $to));
+    }
+
+    /**
+     * @return array
+     */
+    public function dataForTests()
+    {
+        $content = $this->getContent();
+        $output = [];
+
+        foreach ($content['rates'] as $rate => $amount) {
+            $output[] = [$content['base'], $rate, $amount];
+        }
+
+        return $output;
+    }
+}

tests/TestCase.php

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+<?php
+
+namespace Tests;
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Handler\MockHandler;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Psr7\Response;
+use PHPUnit\Framework\TestCase as PHPUnitTestCase;
+use Rdehnhardt\ExchangeRate\Fixer;
+
+abstract class TestCase extends PHPUnitTestCase
+{
+    /**
+     * @return Client
+     */
+    public function client()
+    {
+        $mock = new MockHandler([
+            new Response(200, [], file_get_contents(__DIR__ . '/response.json'))
+        ]);
+
+        return new Client(['handler' => HandlerStack::create($mock)]);
+    }
+
+    /**
+     * @return array
+     */
+    public function getContent()
+    {
+        return json_decode($this->client()->get('/')->getBody()->getContents(), true);
+    }
+
+    /**
+     * @param $from
+     * @return Fixer
+     */
+    public function fixer($from)
+    {
+        $fixer = new Fixer();
+        $fixer->setRates($from, $this->getContent()['rates']);
+
+        return $fixer;
+    }
+}

tests/response.json

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+{
+  "base": "EUR",
+  "date": "0000-00-00",
+  "rates": {
+    "AUD": 1.4915,
+    "BGN": 1.9558,
+    "BRL": 3.7057,
+    "CAD": 1.4541,
+    "CHF": 1.1404,
+    "CNY": 7.8329,
+    "CZK": 26.077,
+    "DKK": 7.4397,
+    "GBP": 0.90775,
+    "HKD": 9.3731,
+    "HRK": 7.4282,
+    "HUF": 306.28,
+    "IDR": 15791.0,
+    "ILS": 4.2255,
+    "INR": 76.674,
+    "JPY": 130.38,
+    "KRW": 1357.8,
+    "MXN": 21.214,
+    "MYR": 5.0357,
+    "NOK": 9.371,
+    "NZD": 1.6502,
+    "PHP": 60.99,
+    "PLN": 4.244,
+    "RON": 4.5987,
+    "RUB": 68.619,
+    "SEK": 9.5705,
+    "SGD": 1.6129,
+    "THB": 39.746,
+    "TRY": 4.0779,
+    "USD": 1.1997,
+    "ZAR": 15.514
+  }
+}