Created the PurpurInstaller.java

src/main/java/de/gnmyt/mcdash/api/installer/PurpurInstaller.java

@@ -0,0 +1,38 @@
+package de.gnmyt.mcdash.api.installer;
+
+import de.gnmyt.mcdash.api.Logger;
+import de.gnmyt.mcdash.api.ServerVersionManager;
+
+import java.io.File;
+
+public class PurpurInstaller implements VersionInstaller {
+
+    private static final Logger LOG = new Logger(PurpurInstaller.class);
+
+    private static final String PURPUR_URL = "https://api.purpurmc.org/v2/purpur/%s/latest/download";
+
+    @Override
+    public boolean installVersion(String software, String version) {
+        try {
+            File file = new File(ServerVersionManager.getVersionFolder(), software + "-" + version + ".jar");
+
+            if (file.exists()) {
+                LOG.info("The version " + version + " of the software " + software + " is already installed");
+                return true;
+            }
+
+            String downloadUrl = String.format(PURPUR_URL, version);
+
+            if (downloadFile(downloadUrl, file)) {
+                LOG.info("The version " + version + " of the software " + software + " has been installed");
+                return true;
+            }
+
+            return false;
+        } catch (Exception e) {
+            LOG.error("An error occurred while installing the purpur version", e);
+            return false;
+        }
+    }
+
+}