Spoof validation (#100)

* Spoof validation

EmailValidator/Validation/Error/SpoofEmail.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Egulias\EmailValidator\Validation\Error;
+
+use Egulias\EmailValidator\Exception\InvalidEmail;
+
+class SpoofEmail extends InvalidEmail
+{
+    const CODE = 998;
+    const REASON = "The email contains mixed UTF8 chars that makes it suspicious";
+}

EmailValidator/Validation/SpoofCheckValidation.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Egulias\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Validation\Error\SpoofEmail;
+use \Spoofchecker;
+
+class SpoofCheckValidation implements EmailValidation
+{
+    /**
+     * @var InvalidEmail
+     */
+    private $error;
+
+    public function isValid($email, EmailLexer $emailLexer)
+    {
+        $checker = new Spoofchecker();
+        $checker->setChecks(Spoofchecker::SINGLE_SCRIPT);
+
+        if ($checker->isSuspicious($email)) {
+            $this->error = new SpoofEmail();
+            return false;
+        }
+
+        return true;
+    }
+
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    public function getWarnings()
+    {
+        return [];
+    }
+}

Tests/EmailValidator/Validation/SpoofCheckValidationTest.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Egulias\Tests\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Validation\SpoofCheckValidation;
+
+class SpoofCheckValidationTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider validUTF8EmailsProvider
+     */
+    public function testUTF8EmailAreValid($email)
+    {
+        $validation = new SpoofCheckValidation();
+
+        $this->assertTrue($validation->isValid($email, new EmailLexer()));
+    }
+
+    public function testEmailWithSpoofsIsInvalid()
+    {
+        $validation = new SpoofCheckValidation();
+
+        $this->assertFalse($validation->isValid("Кириллица"."latin漢字"."ひらがな"."カタカナ", new EmailLexer()));
+    }
+
+    public function validUTF8EmailsProvider()
+    {
+        return [
+            // Cyrillic
+            ['Кириллица@Кириллица'],
+            // Latin + Han + Hiragana + Katakana
+            ["latin漢字"."ひらがな"."カタカナ"."@example.com"],
+            // Latin + Han + Hangul
+            ["latin"."漢字"."조선말"."@example.com"],
+            // Latin + Han + Bopomofo
+            ["latin"."漢字"."ㄅㄆㄇㄈ"."@example.com"]
+        ];
+    }
+}