working on oidc auth

src/main/java/de/srsoftware/widerhall/Configuration.java

@@ -0,0 +1,81 @@
+package de.srsoftware.widerhall;
+
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.file.Files;
+import static de.srsoftware.widerhall.Constants.*;
+public class Configuration {
+    private static Configuration singleton = null;
+    private JSONObject data;
+    private final File file;
+
+    public Configuration(File configFile) throws IOException, ParseException {
+        this.file = configFile;
+        if (!configFile.exists()){
+            setDefaults();
+            save();
+        }
+        var content = Files.readString(configFile.toPath());
+        data = (JSONObject) new JSONParser().parse(content);
+    }
+
+    public static Configuration setFile(File file) throws IOException, ParseException {
+        singleton = new Configuration(file);
+        return singleton;
+    }
+
+    public static Configuration instance() {
+        return singleton;
+    }
+
+    private void setDefaults() throws MalformedURLException {
+        if (data == null) data = new JSONObject();
+        serverPort();
+        tokenUrl();
+        loginUrl();
+        baseUrl();
+        clientId();
+        clientSecret();
+    }
+
+    private void save() throws IOException {
+        Files.writeString(file.toPath(),data.toJSONString());
+    }
+
+    public int serverPort() {
+        if (!data.containsKey(PORT)) data.put(PORT,80L);
+        var o = data.get(PORT);
+        return (int) (long) o;
+    }
+
+    public URL tokenUrl() throws MalformedURLException {
+        if (!data.containsKey(TOKEN_URL)) data.put(TOKEN_URL,"http://localhost:"+serverPort()+"/oauth/token");
+        return new URL((String) data.get(TOKEN_URL));
+    }
+
+    public String loginUrl() {
+        if (!data.containsKey(LOGIN_URL)) data.put(LOGIN_URL,"http://localhost:"+serverPort()+"/oauth/login");
+        return (String) data.get(LOGIN_URL);
+    }
+
+    public String baseUrl() {
+        if (!data.containsKey(BASE_URL)) data.put(BASE_URL,"http://localhost");
+        return (String) data.get(BASE_URL);
+    }
+
+    public String clientId() {
+        if (!data.containsKey(Constants.CLIENT_ID)) data.put(CLIENT_ID,"widerhall");
+        return (String) data.get(CLIENT_ID);
+    }
+
+    public Object clientSecret() {
+        if (!data.containsKey(Constants.CLIENT_SECRET)) data.put(CLIENT_SECRET,"changeme");
+        return (String) data.get(CLIENT_SECRET);
+    }
+}