Email addresses with single quote should not be valid (#268)

* Fixes issue for email addresses with single quote in domain part
* specify version in cli for older php versions

Co-authored-by: Eduardo Gulias Davis <eduardomgulias@gmail.com>

.travis.yml

@@ -31,7 +31,7 @@ matrix:
 
 install:
   - if [ "$deps" = "low" ]; then composer update --prefer-lowest; else composer install; fi
-  - if [ "$psalm" = "yes" ]; then composer require --dev vimeo/psalm; fi
+  - if [ "$psalm" = "yes" ]; then composer require --dev vimeo/psalm:3.18.2; fi
 
 before_script:
   - mkdir -p build/logs
@@ -42,3 +42,4 @@ script:
 
 after_script:
   - php vendor/bin/coveralls
+  

src/EmailLexer.php

@@ -13,6 +13,7 @@ class EmailLexer extends AbstractLexer
     const S_BACKSLASH        = 92;
     const S_DOT              = 46;
     const S_DQUOTE           = 34;
+    const S_SQUOTE           = 39;
     const S_OPENPARENTHESIS  = 49;
     const S_CLOSEPARENTHESIS = 261;
     const S_OPENBRACKET      = 262;
@@ -58,6 +59,7 @@ class EmailLexer extends AbstractLexer
         '/'    => self::S_SLASH,
         ','    => self::S_COMMA,
         '.'    => self::S_DOT,
+        "'"    => self::S_SQUOTE,
         '"'    => self::S_DQUOTE,
         '-'    => self::S_HYPHEN,
         '::'   => self::S_DOUBLECOLON,

src/Parser/DomainPart.php

@@ -335,6 +335,7 @@ class DomainPart extends Parser
     {
         $invalidDomainTokens = array(
             EmailLexer::S_DQUOTE => true,
+            EmailLexer::S_SQUOTE => true,
             EmailLexer::S_SEMICOLON => true,
             EmailLexer::S_GREATERTHAN => true,
             EmailLexer::S_LOWERTHAN => true,

src/Validation/DNSCheckValidation.php

@@ -120,7 +120,7 @@ class DNSCheckValidation implements EmailValidation
 
 
         // No MX, A or AAAA DNS records
-        if (empty($dnsRecords) || !$dnsRecords) {
+        if (empty($dnsRecords)) {
             $this->error = new NoDNSRecord();
             return false;
         }

tests/EmailValidator/EmailLexerTest.php

@@ -138,6 +138,7 @@ class EmailLexerTests extends TestCase
             array(":", EmailLexer::S_COLON),
             array(".", EmailLexer::S_DOT),
             array("\"", EmailLexer::S_DQUOTE),
+            array("'", EmailLexer::S_SQUOTE),
             array("-", EmailLexer::S_HYPHEN),
             array("\\", EmailLexer::S_BACKSLASH),
             array("/", EmailLexer::S_SLASH),

tests/EmailValidator/Validation/RFCValidationTest.php

@@ -168,6 +168,7 @@ class RFCValidationTest extends TestCase
             ['test@email{'],
             ['test@ '],
             ['test@example.com []'],
+            ["test@example.com'"],
         ];
     }
 
@@ -212,6 +213,7 @@ class RFCValidationTest extends TestCase
             [new CRNoLF(), "example@exa\rmple.co.uk"],
             [new CRNoLF(), "example@[\r]"],
             [new CRNoLF(), "exam\rple@example.co.uk"],
+            [new ExpectingATEXT(), "test@example.com'"],
         ];
     }