Parse OpenVPN clients into structured response

src/main/java/com/litoralregas/openvpn/openvpn/OpenVpnClientResponse.java

@@ -0,0 +1,13 @@
+package com.litoralregas.openvpn.openvpn;
+
+public record OpenVpnClientResponse(
+        String clientName,
+        String vpnIp,
+        String vpnNetmask,
+        String lanSubnet,
+        String lanNetmask,
+        boolean serverRoute,
+        boolean bundle,
+        boolean folder
+) {
+}

src/main/java/com/litoralregas/openvpn/openvpn/OpenVpnController.java

@@ -1,8 +1,9 @@
 package com.litoralregas.openvpn.openvpn;
 
-import com.litoralregas.openvpn.ssh.SshCommandResult;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.List;
+
 @RestController
 @RequestMapping("/api/openvpn")
 public class OpenVpnController {
@@ -14,7 +15,7 @@ public class OpenVpnController {
     }
 
     @GetMapping("/clients")
-    public SshCommandResult getClients() {
+    public List<OpenVpnClientResponse> getClients() {
         return service.listClients();
     }
 }

src/main/java/com/litoralregas/openvpn/openvpn/OpenVpnService.java

@@ -1,9 +1,11 @@
 package com.litoralregas.openvpn.openvpn;
 
-import com.litoralregas.openvpn.ssh.SshCommandResult;
 import com.litoralregas.openvpn.ssh.SshService;
 import org.springframework.stereotype.Service;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Service
 public class OpenVpnService {
 
@@ -15,9 +17,50 @@ public class OpenVpnService {
         this.sshService = sshService;
     }
 
-    public SshCommandResult listClients() {
+    public List<OpenVpnClientResponse> listClients() {
-        return sshService.executeOnConfiguredVps(
+        var result = sshService.executeOnConfiguredVps(
                 TOOLS_PATH + "/list-clients.sh"
         );
+
+        if (result.exitCode() != 0) {
+            throw new IllegalStateException(result.stderr());
+        }
+
+        return parseClients(result.stdout());
+    }
+
+    private List<OpenVpnClientResponse> parseClients(String stdout) {
+        List<OpenVpnClientResponse> clients = new ArrayList<>();
+
+        String[] blocks = stdout.split("\\n\\n");
+
+        for (String block : blocks) {
+            if (!block.contains("Client:")) {
+                continue;
+            }
+
+            clients.add(new OpenVpnClientResponse(
+                    extractValue(block, "Client:"),
+                    extractValue(block, "VPN IP:"),
+                    extractValue(block, "VPN netmask:"),
+                    extractValue(block, "LAN subnet:"),
+                    extractValue(block, "LAN netmask:"),
+                    "yes".equalsIgnoreCase(extractValue(block, "Server route:")),
+                    "yes".equalsIgnoreCase(extractValue(block, "Bundle:")),
+                    "yes".equalsIgnoreCase(extractValue(block, "Folder:"))
+            ));
+        }
+
+        return clients;
+    }
+
+    private String extractValue(String block, String label) {
+        for (String line : block.split("\\n")) {
+            if (line.trim().startsWith(label)) {
+                return line.substring(line.indexOf(":") + 1).trim();
+            }
+        }
+
+        return null;
     }
 }