Added Identify plugin for further testing, added todo for next task

Author: ThomasJejkal

src/main/java/edu/kit/datamanager/mappingservice/plugins/PluginLoader.java

@@ -74,6 +74,7 @@ public static Map<String, IMappingPlugin> loadPlugins(File plugDir) throws IOExc
                 List<IMappingPlugin> IMappingPluginList = PluginLoader.createPluggableObjects(plugClasses);
 
                 for (IMappingPlugin i : IMappingPluginList) {
+                    //TODO: Add error handling in case setup of one plugin fails
                     i.setup();
                     result.put(i.id(), i);
                 }

src/main/java/edu/kit/datamanager/mappingservice/plugins/impl/IdentifyPlugin.java

@@ -0,0 +1,83 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package edu.kit.datamanager.mappingservice.plugins.impl;
+
+import edu.kit.datamanager.mappingservice.plugins.IMappingPlugin;
+import edu.kit.datamanager.mappingservice.plugins.MappingPluginException;
+import edu.kit.datamanager.mappingservice.plugins.MappingPluginState;
+import edu.kit.datamanager.mappingservice.util.ShellRunnerUtil;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.util.MimeType;
+
+/**
+ * Simple mapping service plugin calling image magick 'identify' to obtain image
+ * metadata from a given image.
+ *
+ * @author jejkal
+ */
+public class IdentifyPlugin implements IMappingPlugin {
+
+    static Logger LOG = LoggerFactory.getLogger(IdentifyPlugin.class);
+
+    private boolean initialized = false;
+
+    @Override
+    public String name() {
+        return "Identify";
+    }
+
+    @Override
+    public String description() {
+        return "Simple mapping service plugin calling image magick 'identify' to obtain image metadata from a given image.";
+    }
+
+    @Override
+    public String version() {
+        return "1.0.0";
+    }
+
+    @Override
+    public String uri() {
+        return "https://github.com/kit-data-manager/mapping-service";
+    }
+
+    @Override
+    public MimeType[] inputTypes() {
+        return new MimeType[]{MimeType.valueOf("application/octet-stream")};
+    }
+
+    @Override
+    public MimeType[] outputTypes() {
+        return new MimeType[]{MimeType.valueOf("application/octet-stream")};
+    }
+
+    @Override
+    public void setup() {
+        if (Paths.get("/usr/bin/identify").toFile().exists()) {
+            initialized = true;
+        }
+    }
+
+    @Override
+    public MappingPluginState mapFile(Path mappingFile, Path inputFile, Path outputFile) throws MappingPluginException {
+        try {
+            FileOutputStream fout = new FileOutputStream(outputFile.toFile());
+            ShellRunnerUtil.run(fout, fout, "/usr/bin/identify", "-verbose", inputFile.toAbsolutePath().toString());
+            fout.flush();
+            fout.close();
+        } catch (IOException ex) {
+            LOG.error("Failed to execute plugin.", ex);
+            return MappingPluginState.EXECUTION_ERROR;
+        }
+        return MappingPluginState.SUCCESS;
+    }
+
+}