Adding SchemDownloadlink-Generator

SpigotCore_Main/src/de/steamwar/sql/DownloadSchematic.java

@@ -1,7 +1,27 @@
 package de.steamwar.sql;
 
+import org.bukkit.craftbukkit.libs.org.apache.commons.codec.digest.DigestUtils;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.Instant;
+
 public class DownloadSchematic {
-    public DownloadSchematic(Schematic schem){
-        SQL.update("");
+    private DownloadSchematic(){}
+
+    private static final String BASE = "https://steamwar.de/download.php?schem=";
+
+    public static String getLink(Schematic schem){
+        ResultSet rs = SQL.select("SELECT * FROM SchemDownload WHERE SchemID = " + schem.getSchemID());
+        try {
+            if(rs.next())
+                return BASE + rs.getString("Link");
+        } catch (SQLException e) {
+            throw new SecurityException("Could not check schematic for existance", e);
+        }
+
+        String hash = DigestUtils.sha1Hex(Instant.now().toString() + schem.getSchemOwner() + schem.getSchemID());
+        SQL.update("INSERT INTO SchemDownload (SchemID, Link) VALUES (" + schem.getSchemID() + ", '" + hash + "')");
+        return BASE + hash;
     }
 }