Message-id validator (#290)

* scafolding for MessageID validation * Improve domain valid tokens * Improved EmailParser to remove leaked logic. User of lexer recorder within parsers. * MessageIDParser passing tests. * change left for right, which is the right one * psaml errors * Better naming * comments are not allowed in IDLeft for message-id * Suppress psalm inheritance over tokens and dependencies * Update src/Parser.php Co-authored-by: Alexander M. Turek <me@derrabus.de> * Update src/Parser.php Co-authored-by: Alexander M. Turek <me@derrabus.de> * improve parser from comments Co-authored-by: Alexander M. Turek <me@derrabus.de>
2026-08-18 16:10:46 +00:00 · 2021-03-06 18:29:10 +01:00
parent 451b438902
commit 8e526a57c1
17 changed files with 559 additions and 242 deletions
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            "require": {
@@ -4147,10 +4147,10 @@
                    "homepage": "https://symfony.com/contributors"
                }
            ],
-            "description": "Symfony Yaml Component",
+            "description": "Loads and dumps YAML files",
            "homepage": "https://symfony.com",
            "support": {
-                "source": "https://github.com/symfony/yaml/tree/v5.2.1"
+                "source": "https://github.com/symfony/yaml/tree/v5.2.3"
            },
            "funding": [
                {
@@ -4166,7 +4166,7 @@
                    "type": "tidelift"
                }
            ],
-            "time": "2020-12-08T17:02:38+00:00"
+            "time": "2021-02-03T04:42:09+00:00"
        },
        {
            "name": "theseer/tokenizer",
@@ -4220,16 +4220,16 @@
        },
        {
            "name": "vimeo/psalm",
-            "version": "4.4.1",
+            "version": "4.6.2",
            "source": {
                "type": "git",
                "url": "https://github.com/vimeo/psalm.git",
-                "reference": "9fd7a7d885b3a216cff8dec9d8c21a132f275224"
+                "reference": "bca09d74adc704c4eaee36a3c3e9d379e290fc3b"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/vimeo/psalm/zipball/9fd7a7d885b3a216cff8dec9d8c21a132f275224",
-                "reference": "9fd7a7d885b3a216cff8dec9d8c21a132f275224",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/bca09d74adc704c4eaee36a3c3e9d379e290fc3b",
+                "reference": "bca09d74adc704c4eaee36a3c3e9d379e290fc3b",
                "shasum": ""
            },
            "require": {
@@ -4246,8 +4246,8 @@
                "ext-simplexml": "*",
                "ext-tokenizer": "*",
                "felixfbecker/advanced-json-rpc": "^3.0.3",
-                "felixfbecker/language-server-protocol": "^1.4",
-                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0",
+                "felixfbecker/language-server-protocol": "^1.5",
+                "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0 || ^4.0",
                "nikic/php-parser": "^4.10.1",
                "openlss/lib-array2xml": "^1.0",
                "php": "^7.1|^8",
@@ -4263,6 +4263,7 @@
                "bamarni/composer-bin-plugin": "^1.2",
                "brianium/paratest": "^4.0||^6.0",
                "ext-curl": "*",
+                "php-parallel-lint/php-parallel-lint": "^1.2",
                "phpdocumentor/reflection-docblock": "^5",
                "phpmyadmin/sql-parser": "5.1.0||dev-master",
                "phpspec/prophecy": ">=1.9.0",
@@ -4318,21 +4319,21 @@
            ],
            "support": {
                "issues": "https://github.com/vimeo/psalm/issues",
-                "source": "https://github.com/vimeo/psalm/tree/4.4.1"
+                "source": "https://github.com/vimeo/psalm/tree/4.6.2"
            },
-            "time": "2021-01-14T21:44:29+00:00"
+            "time": "2021-02-26T02:24:18+00:00"
        },
        {
            "name": "webmozart/assert",
            "version": "1.9.1",
            "source": {
                "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
+                "url": "https://github.com/webmozarts/assert.git",
                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                "shasum": ""
            },
@@ -4370,8 +4371,8 @@
                "validate"
            ],
            "support": {
-                "issues": "https://github.com/webmozart/assert/issues",
-                "source": "https://github.com/webmozart/assert/tree/master"
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.9.1"
            },
            "time": "2020-07-08T17:02:28+00:00"
        },
@@ -124,6 +124,7 @@ class EmailLexer extends AbstractLexer
     *
     * @var array
     *
+     * @psalm-suppress NonInvariantDocblockPropertyType
     * @psalm-var array{value:string, type:null|int, position:int}
     * @psalm-suppress NonInvariantDocblockPropertyType
     */
@@ -9,18 +9,12 @@ use Egulias\EmailValidator\Parser\DomainPart;
 use Egulias\EmailValidator\Result\ValidEmail;
 use Egulias\EmailValidator\Result\InvalidEmail;
 use Egulias\EmailValidator\Warning\EmailTooLong;
-use Egulias\EmailValidator\Result\Reason\ExpectingATEXT;
 use Egulias\EmailValidator\Result\Reason\NoLocalPart;

-class EmailParser
+class EmailParser extends Parser
 {
    const EMAIL_MAX_LENGTH = 254;

-    /**
-     * @var array
-     */
-    protected $warnings = [];
-
    /**
     * @var string
     */
@@ -30,52 +24,39 @@ class EmailParser
     * @var string
     */
    protected $localPart = '';
-    /**
-     * @var EmailLexer
-     */
-    protected $lexer;
-
-    public function __construct(EmailLexer $lexer)
-    {
-        $this->lexer = $lexer;
-    }

    public function parse(string $str) : Result
    {
-        $this->lexer->setInput($str);
-
-        if (!$this->hasAtToken()) {
-            return new InvalidEmail(new NoLocalPart(), $this->lexer->token["value"]);
-        }
-
-        $localPartResult = $this->processLocalPart();
-
-        if ($localPartResult->isInvalid()) {
-            return $localPartResult;
-        }
-
-        $domainPartResult = $this->processDomainPart();
-
-        if ($domainPartResult->isInvalid()) {
-            return $domainPartResult;
-        }
-
-        if ($this->lexer->hasInvalidTokens()) {
-            return new InvalidEmail(new ExpectingATEXT("Invalid tokens found"), $this->lexer->token["value"]);
-        }
+        $result = parent::parse($str);

        $this->addLongEmailWarning($this->localPart, $this->domainPart);

+        return $result;
+    }
+    
+    protected function preLeftParsing(): Result
+    {
+        if (!$this->hasAtToken()) {
+            return new InvalidEmail(new NoLocalPart(), $this->lexer->token["value"]);
+        }
        return new ValidEmail();
    }

+    protected function parseLeftFromAt(): Result
+    {
+        return $this->processLocalPart();
+    }
+
+    protected function parseRightFromAt(): Result
+    {
+        return $this->processDomainPart();
+    }
+
    private function processLocalPart() : Result
    {
-        $this->lexer->startRecording();
        $localPartParser = new LocalPart($this->lexer);
        $localPartResult = $localPartParser->parse();
-        $this->lexer->stopRecording();
-        $this->localPart = rtrim($this->lexer->getAccumulatedValues(), '@');
+        $this->localPart = $localPartParser->localPart();
        $this->warnings = array_merge($localPartParser->getWarnings(), $this->warnings);

        return $localPartResult;
@@ -83,28 +64,14 @@ class EmailParser

    private function processDomainPart() : Result
    {
-        $this->lexer->clearRecorded();
-        $this->lexer->startRecording();
        $domainPartParser = new DomainPart($this->lexer);
        $domainPartResult = $domainPartParser->parse();
-        $this->lexer->stopRecording();
-        $this->domainPart = $this->lexer->getAccumulatedValues();
+        $this->domainPart = $domainPartParser->domainPart();
        $this->warnings = array_merge($domainPartParser->getWarnings(), $this->warnings);
        
        return $domainPartResult;
    }

-    /**
-     * @return Warning\Warning[]
-     */
-    public function getWarnings() : array
-    {
-        return $this->warnings;
-    }
-
-    /**
-     * @return string
-     */
    public function getDomainPart() : string
    {
        return $this->domainPart;
@@ -115,25 +82,7 @@ class EmailParser
        return $this->localPart;
    }

-    /**
-     * @return bool
-     */
-    protected function hasAtToken() : bool
-    {
-        $this->lexer->moveNext();
-        $this->lexer->moveNext();
-        if ($this->lexer->token['type'] === EmailLexer::S_AT) {
-            return false;
-        }
-
-        return true;
-    }
-
-    /**
-     * @param string $localPart
-     * @param string $parsedDomainPart
-     */
-    protected function addLongEmailWarning($localPart, $parsedDomainPart) : void
+    private function addLongEmailWarning(string $localPart, string $parsedDomainPart) : void
    {
        if (strlen($localPart . '@' . $parsedDomainPart) > self::EMAIL_MAX_LENGTH) {
            $this->warnings[EmailTooLong::CODE] = new EmailTooLong();
@@ -0,0 +1,93 @@
+<?php
+
+namespace Egulias\EmailValidator;
+
+use Egulias\EmailValidator\Parser;
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Result\Result;
+use Egulias\EmailValidator\Parser\IDLeftPart;
+use Egulias\EmailValidator\Parser\IDRightPart;
+use Egulias\EmailValidator\Result\ValidEmail;
+use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Warning\EmailTooLong;
+use Egulias\EmailValidator\Result\Reason\NoLocalPart;
+
+class MessageIDParser extends Parser
+{
+
+    const EMAILID_MAX_LENGTH = 254;
+
+    /**
+     * @var string
+     */
+    protected $idLeft = '';
+
+    /**
+     * @var string
+     */
+    protected $idRight = '';
+
+    public function parse(string $str) : Result
+    {
+        $result = parent::parse($str);
+
+        $this->addLongEmailWarning($this->idLeft, $this->idRight);
+
+        return $result;
+    }
+    
+    protected function preLeftParsing(): Result
+    {
+        if (!$this->hasAtToken()) {
+            return new InvalidEmail(new NoLocalPart(), $this->lexer->token["value"]);
+        }
+        return new ValidEmail();
+    }
+
+    protected function parseLeftFromAt(): Result
+    {
+        return $this->processIDLeft();
+    }
+
+    protected function parseRightFromAt(): Result
+    {
+        return $this->processIDRight();
+    }
+
+    private function processIDLeft() : Result
+    {
+        $localPartParser = new IDLeftPart($this->lexer);
+        $localPartResult = $localPartParser->parse();
+        $this->idLeft = $localPartParser->localPart();
+        $this->warnings = array_merge($localPartParser->getWarnings(), $this->warnings);
+
+        return $localPartResult;
+    }
+
+    private function processIDRight() : Result
+    {
+        $domainPartParser = new IDRightPart($this->lexer);
+        $domainPartResult = $domainPartParser->parse();
+        $this->idRight = $domainPartParser->domainPart();
+        $this->warnings = array_merge($domainPartParser->getWarnings(), $this->warnings);
+        
+        return $domainPartResult;
+    }
+
+    public function getLeftPart() : string
+    {
+        return $this->idLeft;
+    }
+
+    public function getRightPart() : string
+    {
+        return $this->idRight;
+    }
+
+    private function addLongEmailWarning(string $localPart, string $parsedDomainPart) : void
+    {
+        if (strlen($localPart . '@' . $parsedDomainPart) > self::EMAILID_MAX_LENGTH) {
+            $this->warnings[EmailTooLong::CODE] = new EmailTooLong();
+        }
+    }
+}
@@ -0,0 +1,78 @@
+<?php
+
+namespace Egulias\EmailValidator;
+
+use Egulias\EmailValidator\Result\Result;
+use Egulias\EmailValidator\Result\ValidEmail;
+use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Result\Reason\ExpectingATEXT;
+
+abstract class Parser
+{
+    /**
+     * @var Warning\Warning[]
+     */
+    protected $warnings = [];
+
+    /**
+     * @var EmailLexer
+     */
+    protected $lexer;
+
+    /**
+     * id-left "@" id-right
+     */
+    abstract protected function parseRightFromAt() : Result;
+    abstract protected function parseLeftFromAt() : Result;
+    abstract protected function preLeftParsing() : Result;
+
+
+    public function __construct(EmailLexer $lexer)
+    {
+        $this->lexer = $lexer;   
+    }
+
+    public function parse(string $str) : Result
+    {
+        $this->lexer->setInput($str);
+
+        if ($this->lexer->hasInvalidTokens()) {
+            return new InvalidEmail(new ExpectingATEXT("Invalid tokens found"), $this->lexer->token["value"]);
+        }
+
+        $preParsingResult = $this->preLeftParsing();
+        if ($preParsingResult->isInvalid()) {
+            return $preParsingResult;
+        }
+
+        $localPartResult = $this->parseLeftFromAt();
+
+        if ($localPartResult->isInvalid()) {
+            return $localPartResult;
+        }
+
+        $domainPartResult = $this->parseRightFromAt(); 
+
+        if ($domainPartResult->isInvalid()) {
+            return $domainPartResult;
+        }
+
+        return new ValidEmail();
+    }
+
+    /**
+     * @return Warning\Warning[]
+     */
+    public function getWarnings() : array
+    {
+        return $this->warnings;
+    }
+
+    protected function hasAtToken() : bool
+    {
+        $this->lexer->moveNext();
+        $this->lexer->moveNext();
+
+        return $this->lexer->token['type'] !== EmailLexer::S_AT;
+    }
+}
@@ -11,7 +11,7 @@ use Egulias\EmailValidator\Result\Reason\UnclosedComment;
 use Egulias\EmailValidator\Result\Reason\UnOpenedComment;
 use Egulias\EmailValidator\Warning\Comment as WarningComment;

-class Comment extends Parser
+class Comment extends PartParser
 {
    /**
     * @var int
@@ -20,7 +20,7 @@ use Egulias\EmailValidator\Result\Reason\ExpectingDTEXT;
 use Egulias\EmailValidator\Result\Reason\UnusualElements;
 use Egulias\EmailValidator\Warning\DomainLiteral as WarningDomainLiteral;

-class DomainLiteral extends Parser
+class DomainLiteral extends PartParser
 {
    public function parse() : Result
    {
@@ -22,7 +22,7 @@ use Egulias\EmailValidator\Parser\CommentStrategy\DomainComment;
 use Egulias\EmailValidator\Result\Reason\ExpectingDomainLiteralClose;
 use Egulias\EmailValidator\Parser\DomainLiteral as DomainLiteralParser;

-class DomainPart extends Parser
+class DomainPart extends PartParser
 {
    const DOMAIN_MAX_LENGTH = 253;
    const LABEL_MAX_LENGTH = 63;
@@ -39,6 +39,9 @@ class DomainPart extends Parser

    public function parse() : Result
    {
+        $this->lexer->clearRecorded();
+        $this->lexer->startRecording();
+
        $this->lexer->moveNext();

        $domainChecks = $this->performDomainStartChecks();
@@ -49,20 +52,22 @@ class DomainPart extends Parser
        if ($this->lexer->token['type'] === EmailLexer::S_AT) {
            return new InvalidEmail(new ConsecutiveAt(), $this->lexer->token['value']);
        }
-        $domain = $this->doParseDomainPart();
-        if ($domain->isInvalid()) {
-            return $domain;
-        }

-        $length = strlen($this->domainPart);
+        $result = $this->doParseDomainPart();
+        if ($result->isInvalid()) {
+            return $result;
+        }

        $end = $this->checkEndOfDomain();
        if ($end->isInvalid()) {
            return $end;
        }

+        $this->lexer->stopRecording();
+        $this->domainPart = $this->lexer->getAccumulatedValues();
+
+        $length = strlen($this->domainPart);
        if ($length > self::DOMAIN_MAX_LENGTH) {
-            //$this->warnings[DomainTooLong::CODE] = new DomainTooLong();
            return new InvalidEmail(new DomainTooLong(), $this->lexer->token['value']);
        }

@@ -128,14 +133,6 @@ class DomainPart extends Parser
        return new ValidEmail();
    }

-    /**
-     * @return string
-     */
-    public function getDomainPart()
-    {
-        return $this->domainPart;
-    }
-
    protected function parseComments(): Result
    {
        $commentParser = new Comment($this->lexer, new DomainComment());
@@ -229,7 +226,6 @@ class DomainPart extends Parser
     */
    protected function parseDomainLiteral() : Result
    {
-
        try {
            $this->lexer->find(EmailLexer::S_CLOSEBRACKET);
        } catch (\RuntimeException $e) {
@@ -242,22 +238,8 @@ class DomainPart extends Parser
        return $result;
    }

-    /**
-     * @return InvalidEmail|ValidEmail
-     */
    protected function checkDomainPartExceptions(array $prev, bool $hasComments) : Result
    {
-        $validDomainTokens = array(
-            EmailLexer::GENERIC => true,
-            EmailLexer::S_HYPHEN => true,
-            EmailLexer::S_DOT => true,
-        );
-
-        if ($hasComments) {
-            $validDomainTokens[EmailLexer::S_OPENPARENTHESIS] = true;
-            $validDomainTokens[EmailLexer::S_CLOSEPARENTHESIS] = true;
-        }
-
        if ($this->lexer->token['type'] === EmailLexer::S_OPENBRACKET && $prev['type'] !== EmailLexer::S_AT) {
            return new InvalidEmail(new ExpectingATEXT('OPENBRACKET not after AT'), $this->lexer->token['value']);
        }
@@ -271,6 +253,22 @@ class DomainPart extends Parser
            return new InvalidEmail(new ExpectingATEXT('Escaping following "ATOM"'), $this->lexer->token['value']);
        }

+        return $this->validateTokens($hasComments);
+    }
+
+    protected function validateTokens(bool $hasComments) : Result
+    {
+        $validDomainTokens = array(
+            EmailLexer::GENERIC => true,
+            EmailLexer::S_HYPHEN => true,
+            EmailLexer::S_DOT => true,
+        );
+
+        if ($hasComments) {
+            $validDomainTokens[EmailLexer::S_OPENPARENTHESIS] = true;
+            $validDomainTokens[EmailLexer::S_CLOSEPARENTHESIS] = true;
+        }
+
        if (!isset($validDomainTokens[$this->lexer->token['type']])) {
            return new InvalidEmail(new ExpectingATEXT('Invalid token in domain: ' . $this->lexer->token['value']), $this->lexer->token['value']);
        }
@@ -278,7 +276,6 @@ class DomainPart extends Parser
        return new ValidEmail();
    }

-
    private function checkLabelLength(bool $isEndOfDomain = false) : Result
    {
        if ($this->lexer->token['type'] === EmailLexer::S_DOT || $isEndOfDomain) {
@@ -307,4 +304,9 @@ class DomainPart extends Parser
            $this->warnings[TLD::CODE] = new TLD();
        }
    }
+
+    public function domainPart() : string
+    {
+        return $this->domainPart;
+    }
 }
@@ -11,7 +11,7 @@ use Egulias\EmailValidator\Result\Reason\ExpectingATEXT;
 use Egulias\EmailValidator\Result\Reason\UnclosedQuotedString;
 use Egulias\EmailValidator\Result\Result;

-class DoubleQuote extends Parser
+class DoubleQuote extends PartParser
 {
    public function parse() : Result
    {
@@ -13,7 +13,7 @@ use Egulias\EmailValidator\Result\Reason\ExpectingCTEXT;
 use Egulias\EmailValidator\Result\Result;
 use Egulias\EmailValidator\Result\ValidEmail;

-class  FoldingWhiteSpace extends Parser
+class  FoldingWhiteSpace extends PartParser
 {
    public function parse() : Result
    {
@@ -23,7 +23,10 @@ class  FoldingWhiteSpace extends Parser

        $previous = $this->lexer->getPrevious();

-        $this->checkCRLFInFWS();
+        $resultCRLF = $this->checkCRLFInFWS();
+        if ($resultCRLF->isInvalid()) {
+            return $resultCRLF;
+        }

        if ($this->lexer->token['type'] === EmailLexer::S_CR) {
            return new InvalidEmail(new CRNoLF(), $this->lexer->token['value']);
@@ -46,10 +49,7 @@ class  FoldingWhiteSpace extends Parser
        return new ValidEmail();
    }

-    /**
-     * @return InvalidEmail|ValidEmail|null
-     */
-    protected function checkCRLFInFWS()
+    protected function checkCRLFInFWS() : Result
    {
        if ($this->lexer->token['type'] !== EmailLexer::CRLF) {
            return new ValidEmail();
@@ -63,12 +63,11 @@ class  FoldingWhiteSpace extends Parser
        if (!$this->lexer->isNextTokenAny(array(EmailLexer::S_SP, EmailLexer::S_HTAB))) {
            return new InvalidEmail(new CRLFAtTheEnd(), $this->lexer->token['value']);
        }
+
+        return new ValidEmail();
    }
     
-    /**
-     * @return bool
-     */
-    protected function isFWS()
+    protected function isFWS() : bool
    {
        if ($this->escaped()) {
            return false;
@@ -0,0 +1,16 @@
+<?php
+
+namespace Egulias\EmailValidator\Parser;
+
+use Egulias\EmailValidator\Result\Result;
+use Egulias\EmailValidator\Parser\LocalPart;
+use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Result\Reason\CommentsInIDRight;
+
+class IDLeftPart extends LocalPart
+{
+    protected function parseComments(): Result
+    {
+       return new InvalidEmail(new CommentsInIDRight(), $this->lexer->token['value']);
+    }
+}
@@ -0,0 +1,29 @@
+<?php
+
+namespace Egulias\EmailValidator\Parser;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Result\Result;
+use Egulias\EmailValidator\Result\ValidEmail;
+use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Result\Reason\ExpectingATEXT;
+
+class IDRightPart extends DomainPart
+{
+    protected function validateTokens(bool $hasComments) : Result
+    {
+        $invalidDomainTokens = array(
+            EmailLexer::S_DQUOTE => true,
+            EmailLexer::S_SQUOTE => true,
+            EmailLexer::S_BACKTICK => true,
+            EmailLexer::S_SEMICOLON => true,
+            EmailLexer::S_GREATERTHAN => true,
+            EmailLexer::S_LOWERTHAN => true,
+        );
+    
+        if (isset($invalidDomainTokens[$this->lexer->token['type']])) {
+            return new InvalidEmail(new ExpectingATEXT('Invalid token in domain: ' . $this->lexer->token['value']), $this->lexer->token['value']);
+        }
+        return new ValidEmail();
+    }
+}
@@ -13,27 +13,17 @@ use Egulias\EmailValidator\Result\Reason\ConsecutiveDot;
 use Egulias\EmailValidator\Result\Reason\ExpectingATEXT;
 use Egulias\EmailValidator\Parser\CommentStrategy\LocalComment;

-class LocalPart extends Parser
+class LocalPart extends PartParser
 {
-
    /**
-     * Invalid lexer tokens for local part
-     * @var array
+     * @var string
     */
-    private $invalidTokens = array(
-            EmailLexer::S_COMMA => EmailLexer::S_COMMA,
-            EmailLexer::S_CLOSEBRACKET => EmailLexer::S_CLOSEBRACKET,
-            EmailLexer::S_OPENBRACKET => EmailLexer::S_OPENBRACKET,
-            EmailLexer::S_GREATERTHAN => EmailLexer::S_GREATERTHAN,
-            EmailLexer::S_LOWERTHAN => EmailLexer::S_LOWERTHAN,
-            EmailLexer::S_COLON => EmailLexer::S_COLON,
-            EmailLexer::S_SEMICOLON => EmailLexer::S_SEMICOLON,
-            EmailLexer::INVALID => EmailLexer::INVALID
-        );
+    private $localPart = '';
+

    public function parse() : Result
    {
-        $totalLength = 0;
+        $this->lexer->startRecording();

        while ($this->lexer->token['type'] !== EmailLexer::S_AT && null !== $this->lexer->token['type']) {
            if ($this->hasDotAtStart()) {
@@ -74,8 +64,9 @@ class LocalPart extends Parser
                return $resultEscaping;
            }

-            if (isset($this->invalidTokens[$this->lexer->token['type']])) {
-                return new InvalidEmail(new ExpectingATEXT('Invalid token found'), $this->lexer->token['value']);
+            $resultToken = $this->validateTokens(false);
+            if ($resultToken->isInvalid()) {
+                return $resultToken;
            }

            $resultFWS = $this->parseLocalFWS();
@@ -83,17 +74,41 @@ class LocalPart extends Parser
                return $resultFWS;
            }

-            $totalLength += strlen($this->lexer->token['value']);
            $this->lexer->moveNext();
        }

-        if ($totalLength > LocalTooLong::LOCAL_PART_LENGTH) {
+        $this->lexer->stopRecording();
+        $this->localPart = rtrim($this->lexer->getAccumulatedValues(), '@');
+        if (strlen($this->localPart) > LocalTooLong::LOCAL_PART_LENGTH) {
            $this->warnings[LocalTooLong::CODE] = new LocalTooLong();
        }

        return new ValidEmail();
    }

+    protected function validateTokens(bool $hasComments) : Result
+    {
+        $invalidTokens = array(
+            EmailLexer::S_COMMA => EmailLexer::S_COMMA,
+            EmailLexer::S_CLOSEBRACKET => EmailLexer::S_CLOSEBRACKET,
+            EmailLexer::S_OPENBRACKET => EmailLexer::S_OPENBRACKET,
+            EmailLexer::S_GREATERTHAN => EmailLexer::S_GREATERTHAN,
+            EmailLexer::S_LOWERTHAN => EmailLexer::S_LOWERTHAN,
+            EmailLexer::S_COLON => EmailLexer::S_COLON,
+            EmailLexer::S_SEMICOLON => EmailLexer::S_SEMICOLON,
+            EmailLexer::INVALID => EmailLexer::INVALID
+        );
+        if (isset($invalidTokens[$this->lexer->token['type']])) {
+            return new InvalidEmail(new ExpectingATEXT('Invalid token found'), $this->lexer->token['value']);
+        }
+        return new ValidEmail();
+    }
+
+    public function localPart() : string
+    {
+        return $this->localPart;
+    }
+
    private function parseLocalFWS() : Result 
    {
        $foldingWS = new FoldingWhiteSpace($this->lexer);
@@ -118,7 +133,7 @@ class LocalPart extends Parser
        return $parseAgain;
    }

-    private function parseComments(): Result
+    protected function parseComments(): Result
    {
        $commentParser = new Comment($this->lexer, new LocalComment());
        $result = $commentParser->parse();
@@ -8,7 +8,7 @@ use Egulias\EmailValidator\Result\Reason\ConsecutiveDot;
 use Egulias\EmailValidator\Result\Result;
 use Egulias\EmailValidator\Result\ValidEmail;

-abstract class Parser
+abstract class PartParser
 {
    /**
     * @var array
@@ -25,6 +25,8 @@ abstract class Parser
        $this->lexer = $lexer;
    }

+    abstract public function parse() : Result;
+
    /**
     * @return \Egulias\EmailValidator\Warning\Warning[]
     */
@@ -33,8 +35,6 @@ abstract class Parser
        return $this->warnings;
    }

-    abstract public function parse() : Result;
-
    protected function parseFWS() : Result
    {
        $foldingWS = new FoldingWhiteSpace($this->lexer);
@@ -52,9 +52,6 @@ abstract class Parser
        return new ValidEmail();
    }

-    /**
-     * @return bool
-     */
    protected function escaped() : bool
    {
        $previous = $this->lexer->getPrevious();
@@ -0,0 +1,16 @@
+<?php
+
+namespace Egulias\EmailValidator\Result\Reason;
+
+class CommentsInIDRight implements Reason
+{
+    public function code() : int
+    {
+        return 400;
+    }
+
+    public function description() : string
+    {
+        return 'Comments are not allowed in IDRight for message-id';
+    }
+}
@@ -0,0 +1,51 @@
+<?php
+
+namespace Egulias\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\MessageIDParser;
+use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Result\Reason\ExceptionFound;
+
+class MessageIDValidation implements EmailValidation
+{
+
+    /**
+     * @var array
+     */
+    private $warnings = [];
+
+    /**
+     * @var ?InvalidEmail
+     */
+    private $error;
+
+    public function isValid(string $email, EmailLexer $emailLexer): bool
+    {
+        $parser = new MessageIDParser($emailLexer);
+        try {
+            $result = $parser->parse($email);
+            $this->warnings = $parser->getWarnings();
+            if ($result->isInvalid()) {
+                /** @psalm-suppress PropertyTypeCoercion */
+                $this->error = $result;
+                return false;
+            }
+        } catch (\Exception $invalid) {
+            $this->error = new InvalidEmail(new ExceptionFound($invalid), '');
+            return false;
+        }
+
+        return true;
+    }
+
+    public function getWarnings(): array
+    {
+        return $this->warnings;
+    }
+
+    public function getError(): ?InvalidEmail
+    {
+        return $this->error;
+    }
+}
@@ -0,0 +1,70 @@
+<?php
+
+namespace Egulias\EmailValidator\Tests\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Validation\MessageIDValidation;
+use PHPUnit\Framework\TestCase;
+
+class MessageIDValidationTest extends TestCase
+{
+
+    /**
+     * @dataProvider validMessageIDs
+     */
+    public function testValidMessageIDs(string $messageID)
+    {
+        $validator = new MessageIDValidation();
+
+        $this->assertTrue($validator->isValid($messageID, new EmailLexer()));
+    }
+
+    public function validMessageIDs() : array
+    {
+        return [
+            ['a@b.c+&%$.d'],
+            ['a.b+&%$.c@d'],
+            ['a@ä'],
+        ];
+    }
+
+    /**
+     * @dataProvider invalidMessageIDs
+     */
+    public function testInvalidMessageIDs(string $messageID)
+    {
+        $validator = new MessageIDValidation();
+
+        $this->assertFalse($validator->isValid($messageID, new EmailLexer()));
+    }
+
+    public function invalidMessageIDs() : array
+    {
+        return [
+            ['example'],
+            ['example@with space'],
+            ['example@iana.'],
+            ['example@ia\na.'],
+            /**
+             * RFC 2822, section 3.6.4, Page 25
+             * Since the msg-id has
+             * a similar syntax to angle-addr (identical except that comments and
+             * folding white space are not allowed), a good method is to put the
+             * domain name (or a domain literal IP address) of the host on which the
+             * message identifier was created on the right hand side of the "@", and
+             * put a combination of the current absolute date and time along with
+             * some other currently unique (perhaps sequential) identifier available
+             * on the system (for example, a process id number) on the left hand
+             * side.
+             */
+            ['example(comment)@example.com'],
+            ["\r\nFWS@example.com"]
+        ];
+    }
+
+    public function testInvalidMessageIDsWithError()
+    {
+        $this->markTestIncomplete("missing error check");
+
+    }
+}