Only keep supported characters within qr codes

src/DataGroup/Element/PaymentReference.php

@@ -93,6 +93,7 @@ public static function loadValidatorMetadata(ClassMetadata $metadata): void
         ]);
 
         $metadata->addPropertyConstraints('reference', [
+            /** @phpstan-ignore-next-line because docs do not match bc compatible syntax */
             new Assert\Type([
                 'type' => 'alnum',
                 'groups' => [self::TYPE_QR]

src/QrBill.php

@@ -34,6 +34,9 @@ final class QrBill implements SelfValidatableInterface
     private ?PaymentReference $paymentReference = null;
     private ?AdditionalInformation $additionalInformation = null;
 
+    /** @var array<string, string> */
+    private array $unsupportedCharacterReplacements = [];
+
     /** @var AlternativeScheme[] */
     private array $alternativeSchemes = [];
 
@@ -163,8 +166,16 @@ public function addAlternativeScheme(AlternativeScheme $alternativeScheme): self
     }
 
     /**
-     * @throws InvalidQrBillDataException
+     * @param array<string, string> $unsupportedCharacterReplacements
+     * @return $this
      */
+    public function setUnsupportedCharacterReplacements(array $unsupportedCharacterReplacements): self
+    {
+        $this->unsupportedCharacterReplacements = $unsupportedCharacterReplacements;
+
+        return $this;
+    }
+
     public function getQrCode(?string $fileFormat = null): QrCode
     {
         if (!$this->isValid()) {
@@ -175,7 +186,8 @@ public function getQrCode(?string $fileFormat = null): QrCode
 
         return QrCode::create(
             $this->getQrCodeContent(),
-            $fileFormat
+            $fileFormat,
+            $this->unsupportedCharacterReplacements
         );
     }
 

src/QrCode/QrCode.php

@@ -18,6 +18,8 @@ final class QrCode
     public const FILE_FORMAT_PNG = 'png';
     public const FILE_FORMAT_SVG = 'svg';
 
+    public const SUPPORTED_CHARACTERS = 'a-zA-Z0-9.,;:\'"+\-\/()?*\[\]{}|`´~ !^#%&<>÷=@_$£àáâäçèéêëìíîïñòóôöùúûüýßÀÁÂÄÇÈÉÊËÌÍÎÏÒÓÔÖÙÚÛÜÑ';
+
     private const SUPPORTED_FILE_FORMATS = [
         self::FILE_FORMAT_PNG,
         self::FILE_FORMAT_SVG
@@ -34,17 +36,33 @@ final class QrCode
     /** @var array<string, bool> $writerOptions */
     private array $writerOptions = [SvgWriter::WRITER_OPTION_FORCE_XLINK_HREF => true];
 
-    public static function create(string $data, string $fileFormat = null): self
+    /**
+     * @param string $data
+     * @param string|null $fileFormat
+     * @param array<string, string> $unsupportedCharacterReplacements
+     * @return self
+     * @throws UnsupportedFileExtensionException
+     */
+    public static function create(string $data, string $fileFormat = null, array $unsupportedCharacterReplacements = []): self
     {
         if (null === $fileFormat) {
             $fileFormat = self::FILE_FORMAT_SVG;
         }
 
-        return new self($data, $fileFormat);
+        return new self($data, $fileFormat, $unsupportedCharacterReplacements);
     }
 
-    private function __construct(string $data, string $fileFormat)
+    /**
+     * @param string $data
+     * @param string $fileFormat
+     * @param array<string, string> $unsupportedCharacterReplacements
+     * @throws UnsupportedFileExtensionException
+     */
+    private function __construct(string $data, string $fileFormat, array $unsupportedCharacterReplacements)
     {
+        $data = $this->replaceUnsupportedCharacters($data, $unsupportedCharacterReplacements);
+        $data = $this->cleanUnsupportedCharacters($data);
+
         if (class_exists(ErrorCorrectionLevel\ErrorCorrectionLevelMedium::class)) {
             // Endroid 4.x
             $this->qrCode = BaseQrCode::create($data)
@@ -127,6 +145,29 @@ public function avoidCompactSvgs(): void
         }
     }
 
+    /**
+     * @param string $data
+     * @param array<string, string> $unsupportedCharacterReplacements
+     * @return string
+     */
+    private function replaceUnsupportedCharacters(string $data, array $unsupportedCharacterReplacements): string
+    {
+        foreach ($unsupportedCharacterReplacements as $character => $replacement) {
+            if (preg_match("/([^" . self::SUPPORTED_CHARACTERS . "])/u", $character)) {
+                $data = str_replace($character, $replacement, $data);
+            }
+        }
+
+        return $data;
+    }
+
+    private function cleanUnsupportedCharacters(string $data): string
+    {
+        $supportedCharacters = self::SUPPORTED_CHARACTERS . "\\n";
+
+        return preg_replace("/([^$supportedCharacters])/u", '', $data);
+    }
+
     private function setWriterByExtension(string $extension): void
     {
         if (!in_array($extension, self::SUPPORTED_FILE_FORMATS)) {

tests/QrBillTest.php

@@ -237,6 +237,45 @@ public function testMaximumTwoAlternativeSchemesAreAllowed()
         $this->assertFalse($qrBill->isValid());
     }
 
+    public function testItReplacesUnsupportedCharacters()
+    {
+        $qrBill = $this->createQrBill([
+            'header',
+            'creditorInformationQrIban',
+            'creditorWithUnsupportedCharacters',
+            'paymentAmountInformation',
+            'paymentReferenceQr',
+        ]);
+
+        $this->assertStringContainsString(
+            'Team We are the Champions!',
+            $qrBill->getQrCode()->getText()
+        );
+    }
+
+    public function testItConsidersReplacementCharacters()
+    {
+        $qrBill = $this->createQrBill([
+            'header',
+            'creditorInformationQrIban',
+            'creditorWithUnsupportedCharacters',
+            'paymentAmountInformation',
+            'paymentReferenceQr',
+        ]);
+
+        $unsupportedCharacterReplacements = [
+            '«' => '"',
+            '»' => '"',
+        ];
+
+        $qrBill->setUnsupportedCharacterReplacements($unsupportedCharacterReplacements);
+
+        $this->assertStringContainsString(
+            'Team "We are the Champions!"',
+            $qrBill->getQrCode()->getText()
+        );
+    }
+
     public function testCatchInvalidData()
     {
         $this->expectException(InvalidQrBillDataException::class);

tests/QrCode/QrCodeTest.php

@@ -118,4 +118,65 @@ public function stringProvider()
             ]
         ];
     }
+
+    /**
+     * @dataProvider replacementCharactersProvider
+     */
+    public function testItReplacesUnsupportedCharacters(string $providedString, array $replacements, string $expectedString): void
+    {
+        $qrCode = QrCode::create($providedString, null, $replacements);
+
+        $this->assertEquals(
+            $expectedString,
+            $qrCode->getText()
+        );
+    }
+
+    public function replacementCharactersProvider(): array
+    {
+        return [
+            'replaceSpecificUnsupportedCharacters' => [
+                'providedString' => '«This is a test!»',
+                'replacements' => [
+                    '«' => '"',
+                    '»' => '"'
+                ],
+                'expectedString' => '"This is a test!"'
+            ],
+            'ignoreReplacementsOfSupportedCharacters' => [
+                'providedString' => '«This is a test!»',
+                'replacements' => [
+                    't' => 'a',
+                ],
+                'expectedString' => 'This is a test!'
+            ],
+        ];
+    }
+
+    /**
+     * @dataProvider unsupportedCharactersProvider
+     */
+    public function testItRemovesUnsupportedCharacters(string $providedString, string $expectedString): void
+    {
+        $qrCode = QrCode::create($providedString);
+
+        $this->assertEquals(
+            $expectedString,
+            $qrCode->getText()
+        );
+    }
+
+    public function unsupportedCharactersProvider(): array
+    {
+        return [
+            'keepAllAllowedCharacters' => [
+                'providedString' => 'a-zA-Z0-9.,;:\'+-/()?*[]{}|`´~!"#%&<>÷=@_$£^àáâäçèéêëìíîïñòóôöùúûüýßÀÁÂÄÇÈÉÊËÌÍÎÏÒÓÔÖÙÚÛÜÑ',
+                'expectedString' => 'a-zA-Z0-9.,;:\'+-/()?*[]{}|`´~!"#%&<>÷=@_$£^àáâäçèéêëìíîïñòóôöùúûüýßÀÁÂÄÇÈÉÊËÌÍÎÏÒÓÔÖÙÚÛÜÑ'
+            ],
+            'removeUnallowedCharacters' => [
+                'providedString' => '«This is a test!»',
+                'expectedString' => 'This is a test!'
+            ],
+        ];
+    }
 }

tests/TestQrBillCreatorTrait.php

@@ -218,6 +218,11 @@ public function creditor(QrBill &$qrBill)
         $qrBill->setCreditor($this->structuredAddress());
     }
 
+    public function creditorWithUnsupportedCharacters(QrBill &$qrBill)
+    {
+        $qrBill->setCreditor($this->addressWithUnsupportedCharacters());
+    }
+
     public function creditorMediumLong(QrBill &$qrBill)
     {
         $qrBill->setCreditor($this->mediumLongAddress());
@@ -392,6 +397,16 @@ public function longAddress()
         );
     }
 
+    public function addressWithUnsupportedCharacters()
+    {
+        return CombinedAddress::create(
+            'Team «We are the Champions!»',
+            'Rue examplaire 22a',
+            '1000 Lausanne',
+            'CH'
+        );
+    }
+
     public function invalidAddress()
     {
         return CombinedAddress::create(