Feature/jf 2575 detect pkcs7

pom.xml

@@ -49,23 +49,23 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-    <bouncycastle.version>1.82</bouncycastle.version>
+    <bouncycastle.version>1.83</bouncycastle.version>
     <commons-compress.version>1.28.0</commons-compress.version>
     <commons.io.version>2.21.0</commons.io.version>
     <jaxb-api.version>4.0.4</jaxb-api.version>
     <jaxb-core.version>4.0.6</jaxb-core.version>
     <jaxb-impl.version>4.0.6</jaxb-impl.version>
     <opennlp-tools.version>1.9.3</opennlp-tools.version>
     <pdfbox.version>3.0.6</pdfbox.version>
-    <poi.version>5.5.0</poi.version>
+    <poi.version>5.5.1</poi.version>
     <rtfparserkit.version>1.16.0</rtfparserkit.version>
     <slf4j.version>2.0.17</slf4j.version>
     <zip4j.version>2.11.5</zip4j.version>
     <!-- testing -->
     <hamcrest.version>3.0</hamcrest.version>
     <jmock-junit5.version>2.13.1</jmock-junit5.version>
     <junit.version>5.11.4</junit.version>
-    <log4j.version>2.25.2</log4j.version>
+    <log4j.version>2.25.3</log4j.version>
   </properties>
 
   <build>

src/main/java/org/jadice/filetype/matchers/PKCS7Matcher.java

@@ -0,0 +1,53 @@
+package org.jadice.filetype.matchers;
+
+import java.io.IOException;
+import java.security.Security;
+import java.util.Base64;
+
+import org.bouncycastle.cms.CMSSignedData;
+import org.jadice.filetype.Context;
+import org.jadice.filetype.io.SeekableInputStream;
+
+public class PKCS7Matcher extends Matcher {
+
+  @Override
+  public boolean matches(final Context context) throws IOException {
+    SeekableInputStream sis = context.getStream();
+    return isPKCS7(sis, context.getStatedExtension());
+  }
+
+  public static boolean isPKCS7(SeekableInputStream sis, String extension) throws IOException {
+    byte[] buffer = new byte[5];
+    sis.readFully(buffer);
+    try {
+      if (looksLikeCms(buffer) || (extension != null && ("ps7".equals(extension) || extension.startsWith("p7")))) {
+        return readAsCMS(sis);
+      }
+    } catch (Exception e) {
+      // ignore – detection should be resilient
+    }
+    return false;
+  }
+
+  private static boolean looksLikeCms(byte[] data) {
+    // ASN.1 DER SEQUENCE
+    return data.length > 2 && (data[0] & 0xFF) == 0x30;
+  }
+
+  private static boolean readAsCMS(SeekableInputStream sis) throws Exception {
+    Security.addProvider(
+        new org.bouncycastle.jce.provider.BouncyCastleProvider());
+    sis.seek(0);
+    final byte[] data = sis.readAllBytes();
+    CMSSignedData cms;
+    try {
+      // first try to decode in case it is base64-encoded
+      byte[] decodedBytes = Base64.getDecoder().decode(data);
+      cms = new CMSSignedData(decodedBytes);
+    } catch (IllegalArgumentException e) {
+      cms = new CMSSignedData(data);
+    }
+    return cms.getSignedContent() != null;
+  }
+}
+

src/main/resources/magic.xml

@@ -761,6 +761,28 @@
       <description>X-Rechnung type CreditNote</description>
       <match-xml-metadata namespaceUri="urn:oasis:names:specification:ubl:schema:xsd:CreditNote-" rootElementName="CreditNote">x_rechnung</match-xml-metadata>
     </type>
+    <type>
+      <description>E-Rezept</description>
+      <match-xml-metadata namespaceUri="http://hl7.org/fhir" rootElementName="Bundle">e_rezept</match-xml-metadata>
+    </type>
+  </type>
+
+  <type>
+    <mime-type>application/json</mime-type>
+    <extension>json</extension>
+    <description>JSON</description>
+    <match-regexp offset="0" range="1" >^(\{|\[)</match-regexp>
+    <type>
+      <description>E-Rezept</description>
+      <match-regexp offset="0" range="100" multiline="true">resourceType</match-regexp>
+    </type>
+  </type>
+
+  <type>
+    <mime-type>application/pkcs7-mime</mime-type>
+    <extension>p7s</extension>
+    <description>PKCS #7</description>
+    <match-custom>org.jadice.filetype.matchers.PKCS7Matcher</match-custom>
   </type>
 
   <type>
@@ -770,7 +792,6 @@
     <match-regexp offset="4">ftypheif</match-regexp>
   </type>
 
-
   <type>
     <mime-type>image/heic</mime-type>
     <extension>heic</extension>