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

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

@@ -1,7 +1,10 @@
 package com.vaessl.app.connection;
 
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
 import org.springframework.stereotype.Service;
-import org.springframework.web.client.RestClient;
 
 import com.vaessl.app.dto.ConnectionRequest;
 import com.vaessl.app.dto.ConnectionResponse;
@@ -9,20 +12,20 @@ import com.vaessl.app.dto.ConnectionResponse;
 @Service
 public class ConnectionService {
 
-    private final RestClient.Builder restClientBuilder;
+    private final Map<String, ConnectionProvider> providerRegistry;
 
-    public ConnectionService(RestClient.Builder restClientBuilder) {
-        this.restClientBuilder = restClientBuilder;
+    public ConnectionService(List<ConnectionProvider> providers) {
+        this.providerRegistry = providers.stream()
+                .collect(Collectors.toMap(ConnectionProvider::getServiceType, p -> p));
     }
 
     public ConnectionResponse login(ConnectionRequest request) {
-        // TODO: Look into Map<String, RestClient> to cache restclient requests.
-        return restClientBuilder.baseUrl(request.appUrl())
-                .build()
-                .post()
-                .uri("/api/v1/users/login")
-                .body(request)
-                .retrieve()
-                .body(ConnectionResponse.class);
+        ConnectionProvider provider = providerRegistry.get(request.serviceType().toUpperCase());
+
+        if (provider == null) {
+            throw new IllegalArgumentException("Unknown provider: " + request.serviceType());
+        }
+
+        return provider.authenticate(request);
     }
 }