Added software/codemeta stuff

README.md

@@ -281,6 +281,29 @@ There are Message Properties which can be set in the message.properties file:
 | project.form.agreement             | The text which will be displayed as a legend for the agreement in the editor            | Einverständniserklärung                           |
 | project.form.validation.agreement  | The text which will be displayed as a validation error if the agreement is not accepted | Sie müssen der Einverständniserklärung zustimmen. |
 
+### Codemeta
+
+#### Metadata
+Codemeta metadata view and export can be enabled via mycore.properties:
+
+```properties
+MIR.Layout.End=%MIR.Layout.End%,export-extension
+MIR.Layout.Start=%MIR.Layout.Start%,reposis-metadata-extension
+MIR.Layout.Display.Div=%MIR.Layout.Display.Div%,reposis-export-extension
+MCR.URIResolver.xslImports.modsmeta=%MCR.URIResolver.xslImports.modsmeta%,metadata/reposis-export-extension.xsl,metadata/reposis-metadata-extension.xsl
+```
+
+#### OAI
+OAI Codemeta set can be enabled via mycore.properties:
+
+```properties
+MCR.ContentTransformer.oai-codemeta.Stylesheet=xslt/mycoreobject2codemeta-jsonld.xsl,xslt/codemeta-jsonld2rdf.xsl
+MCR.ContentTransformer.oai-codemeta.TransformerFactoryClass=net.sf.saxon.TransformerFactoryImpl
+MCR.OAIDataProvider.MetadataFormat.codemeta.Schema=http://www.openarchives.org/OAI/2.0/rdf.xsd
+MCR.OAIDataProvider.MetadataFormat.codemeta.Namespace=http://www.w3.org/1999/02/22-rdf-syntax-ns#
+MCR.OAIDataProvider.OAI2.Sets.codemeta.URI=webapp:oai/set_codemeta.xml
+MCR.OAIDataProvider.OAI2.Sets.codemeta.Query=mods.genre:software
+```
 
 ## Development
 
@@ -291,4 +314,4 @@ MCR.Developer.Resource.Override=/path/to/reposis_common/src/main/resources
 MCR.LayoutService.LastModifiedCheckPeriod=0
 MCR.UseXSLTemplateCache=false
 MCR.SASS.DeveloperMode=true
-```
+```

pom.xml

@@ -105,20 +105,30 @@
     </repository>
   </repositories>
   <dependencies>
+    <dependency>
+      <groupId>com.github.jsonld-java</groupId>
+      <artifactId>jsonld-java</artifactId>
+      <version>0.13.4</version>
+      <scope>compile</scope>
+    </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
     </dependency>
     <!-- enable theese if you write code using them
-        <dependency>
-            <groupId>org.mycore</groupId>
-            <artifactId>mycore-pi</artifactId>
-        </dependency>
-        -->
+    <dependency>
+      <groupId>org.mycore</groupId>
+      <artifactId>mycore-pi</artifactId>
+    </dependency>
+    -->
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
     </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+    </dependency>
     <dependency>
       <groupId>jakarta.servlet</groupId>
       <artifactId>jakarta.servlet-api</artifactId>
@@ -127,6 +137,14 @@
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.eclipse.rdf4j</groupId>
+      <artifactId>rdf4j-model</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.rdf4j</groupId>
+      <artifactId>rdf4j-model-api</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.jdom</groupId>
       <artifactId>jdom2</artifactId>
@@ -151,10 +169,25 @@
       <groupId>org.mycore</groupId>
       <artifactId>mycore-user2</artifactId>
     </dependency>
-	<dependency>
-        <groupId>com.h2database</groupId>
-        <artifactId>h2</artifactId>
-        <scope>test</scope>
+    <dependency>
+      <groupId>org.eclipse.rdf4j</groupId>
+      <artifactId>rdf4j-rio-api</artifactId>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.rdf4j</groupId>
+      <artifactId>rdf4j-rio-jsonld</artifactId>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.rdf4j</groupId>
+      <artifactId>rdf4j-rio-rdfxml</artifactId>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>junit</groupId>

src/main/java/de/gbv/reposis/codemeta/CodeMetaRDFConverterResolver.java

@@ -0,0 +1,76 @@
+package de.gbv.reposis.codemeta;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
+import javax.xml.transform.Source;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.URIResolver;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.eclipse.rdf4j.model.Model;
+import org.eclipse.rdf4j.model.impl.LinkedHashModel;
+import org.eclipse.rdf4j.rio.Rio;
+import org.eclipse.rdf4j.rio.helpers.JSONLDSettings;
+import org.eclipse.rdf4j.rio.helpers.StatementCollector;
+import org.eclipse.rdf4j.rio.jsonld.JSONLDParser;
+import org.eclipse.rdf4j.rio.rdfxml.RDFXMLWriter;
+import org.jdom2.Document;
+import org.jdom2.input.SAXBuilder;
+import org.jdom2.transform.JDOMSource;
+
+import com.github.jsonldjava.core.DocumentLoader;
+
+public class CodeMetaRDFConverterResolver implements URIResolver {
+
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    private static final String CODEMETA_JSONLD_PATH = "/jsonld/codemeta.jsonld";
+
+    private static final String CODEMETA_JSONLD_URL = "https://doi.org/10.5063/schema/codemeta-2.0";
+
+    /**
+     * Converts CodeMeta JSON-LD to RDF.
+     * <p>
+     * Syntax: <code>codemeta2rdf:{baseURI}:{json}</code>
+     *
+     * @param href the URI in the syntax above
+     * @param base not used
+     * @return a document containing the converted RDF
+     * @see javax.xml.transform.URIResolver
+     */
+    @Override
+    public Source resolve(final String href, final String base) throws TransformerException {
+        final String[] hrefParts = href.split(":", 3);
+        if (hrefParts.length > 2) {
+            final String baseURI = hrefParts[1];
+            final String json = hrefParts[2];
+            try (final InputStream input = new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8));
+                final ByteArrayOutputStream out = new ByteArrayOutputStream()) {
+                final String codemetaJsonld = IOUtils.resourceToString(CODEMETA_JSONLD_PATH, StandardCharsets.UTF_8);
+                final DocumentLoader docLoader = new DocumentLoader();
+                docLoader.addInjectedDoc(CODEMETA_JSONLD_URL, codemetaJsonld);
+                final JSONLDParser parser = new JSONLDParser();
+                parser.getParserConfig().set(JSONLDSettings.DOCUMENT_LOADER, docLoader);
+                final Model model = new LinkedHashModel();
+                parser.setRDFHandler(new StatementCollector(model));
+                if (baseURI.isEmpty()) {
+                    parser.parse(input, null);
+                } else {
+                    parser.parse(input, baseURI);
+                }
+                final RDFXMLWriter writer = new RDFXMLWriter(out);
+                Rio.write(model, writer);
+                final Document result = new SAXBuilder().build(new ByteArrayInputStream(out.toByteArray()));
+                return new JDOMSource(result);
+            } catch (Exception e) {
+                LOGGER.error("Unable to convert to rdf", e);
+            }
+        }
+        throw new IllegalArgumentException("Invalid format of uri for retrieval of json2rdf: " + href);
+    }
+}

src/main/java/de/gbv/reposis/util/ValidationHelper.java

@@ -0,0 +1,17 @@
+package de.gbv.reposis.util;
+
+import java.net.MalformedURLException;
+import java.net.URISyntaxException;
+import java.net.URL;
+
+public class ValidationHelper {
+
+    public static boolean validateUrl(String url) {
+        try {
+            new URL(url).toURI();
+        } catch (MalformedURLException | URISyntaxException e) {
+            return false;
+        }
+        return true;
+    }
+}