Merge pull request #20 from Setasign/development

Development

Author: JanSlabon

.gitignore

@@ -1,4 +1,5 @@
 vendor
 .idea
 composer.phar
-.DS_Store
+.DS_Store
+local-tests/*.pdf

src/FpdiProtection.php

@@ -218,22 +218,22 @@ public function __construct($orientation = 'P', $unit = 'mm', $size = 'A4', $use
             return;
         }
 
-        if (OPENSSL_VERSION_NUMBER >= 0x30000000 && PHP_VERSION_ID < 80100) {
-            throw new \RuntimeException(
-                'OpenSSL 3 is not supported with PHP versions < 8.1.0. ' .
-                'You\'re using PHP ' . PHP_VERSION . ' with ' . OPENSSL_VERSION_TEXT . '. ' .
-                'Please fix your PHP installation or set $useArcfourFallback to true to use a slower fallback implementation.'
-            );
-        }
-
-        if (!(function_exists('openssl_encrypt') && in_array('rc4-40', openssl_get_cipher_methods(), true))) {
+        if (!function_exists('openssl_encrypt') || !in_array('rc4-40', openssl_get_cipher_methods(), true)) {
             throw new \RuntimeException(
                 'OpenSSL with RC4 supported is required if $useArcfourFallback is false. ' .
                 'If using OpenSSL 3 make sure that legacy providers are loaded ' .
                 '(see https://wiki.openssl.org/index.php/OpenSSL_3.0#Providers).'
             );
         }
 
+        if (OPENSSL_VERSION_NUMBER >= 0x30000000 && PHP_VERSION_ID < 80100) {
+            throw new \RuntimeException(
+                'OpenSSL 3 is not supported with PHP versions < 8.1.0. ' .
+                'You\'re using PHP ' . PHP_VERSION . ' with ' . OPENSSL_VERSION_TEXT . '. ' .
+                'Please fix your PHP installation or set $useArcfourFallback to true to ' .
+                'use a slower fallback implementation.'
+            );
+        }
     }
 
     /**

tests/functional/FpdiProtectionTest.php

@@ -345,4 +345,31 @@ public function testLinks()
 
         $this->assertEquals($linkTarget, $uri);
     }
+
+    public function testWithArcfourFallback()
+    {
+        $linkTarget = 'https://setasign.com';
+        $pdf = new FpdiProtection('P', 'mm', 'A4', true);
+        $pdf->setProtection([], 'user', 'owner', 3);
+        $pdf->AddPage();
+        $pdf->SetFont('Helvetica', '', 12);
+        $pdf->Cell(0, 10, 'Test', 0, 0, '', false, $linkTarget);
+
+        $encryptionKey = $this->getEncryptionKey($pdf);
+
+        $pdfString = $pdf->Output('S');
+
+        // let's extract the object manually and parse it into a object structre
+        preg_match('~5 0 obj(.*?)endobj~s', $pdfString, $match);
+        $parser = new PdfParser(StreamReader::createByString($match[1]));
+        $value = $parser->readValue();
+
+        $uri = PdfString::unescape($value->value['A']->value['URI']->value);
+
+        $uri = openssl_decrypt(
+            $uri, 'RC4-40', $this->calcKey($encryptionKey, 5, 3),  OPENSSL_RAW_DATA
+        );
+
+        $this->assertEquals($linkTarget, $uri);
+    }
 }