refactored connection classes to be more generic and accept credentials of different apps.

backend/src/main/java/com/vaessl/app/connection/HomeBoxConnectionProvider.java

@@ -0,0 +1,42 @@
+package com.vaessl.app.connection;
+
+import java.util.Map;
+
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestClient;
+
+import com.vaessl.app.dto.ConnectionRequest;
+import com.vaessl.app.dto.ConnectionResponse;
+
+import static com.vaessl.app.connection.Endpoints.*;
+
+@Component
+public class HomeBoxConnectionProvider implements ConnectionProvider {
+
+    private final RestClient.Builder restClientBuilder;
+
+    public HomeBoxConnectionProvider(RestClient.Builder restClientBuilder) {
+        this.restClientBuilder = restClientBuilder;
+    }
+
+    @Override
+    public String getServiceType() {
+        return "HOMEBOX";
+    }
+
+    @Override
+    public ConnectionResponse authenticate(ConnectionRequest connectionRequest) {
+        Map<String, Object> homeboxPayload = Map.of("username", connectionRequest.credentials().get("username"),
+                "password", connectionRequest.credentials().get("password"), "stayLoggedIn",
+                connectionRequest.stayLoggedIn());
+
+        return restClientBuilder.baseUrl(connectionRequest.appUrl())
+                .build()
+                .post()
+                .uri(HOMEBOX_LOGIN.getEndpoint())
+                .body(homeboxPayload)
+                .retrieve()
+                .body(ConnectionResponse.class);
+    }
+
+}