initial commit

src/main/java/com/rit/whatsapp/service/ImsApiService.java

@@ -0,0 +1,105 @@
+package com.rit.whatsapp.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Service
+public class ImsApiService {
+
+    private final String BASE_URL = "https://ims-api.sidharthprabhu.co.in";
+    private final RestTemplate restTemplate;
+    private final ObjectMapper objectMapper;
+
+    public ImsApiService() {
+        this.restTemplate = new RestTemplate();
+        this.objectMapper = new ObjectMapper();
+    }
+
+    /**
+     * Authenticates the user against the real IMS backend.
+     * @param imsId The user ID
+     * @param passcode The passcode
+     * @return The API session token if successful, null otherwise.
+     */
+    public String authenticate(String imsId, String passcode) {
+        String url = BASE_URL + "/api/auth/login";
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_JSON);
+
+        Map<String, String> requestBody = new HashMap<>();
+        requestBody.put("username", imsId);
+        requestBody.put("password", passcode);
+
+        HttpEntity<Map<String, String>> request = new HttpEntity<>(requestBody, headers);
+
+        try {
+            ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);
+            if (response.getStatusCode().is2xxSuccessful() && response.getBody() != null) {
+                JsonNode rootNode = objectMapper.readTree(response.getBody());
+                if (rootNode.has("success") && rootNode.get("success").asBoolean()) {
+                    if (rootNode.has("session")) {
+                        return rootNode.get("session").asText();
+                    }
+                }
+            }
+        } catch (Exception e) {
+            System.err.println("Failed to authenticate with IMS API: " + e.getMessage());
+        }
+        
+        return null;
+    }
+
+    private String fetchFromIms(String endpoint, String token) {
+        String url = BASE_URL + endpoint;
+        HttpHeaders headers = new HttpHeaders();
+        headers.setBearerAuth(token);
+        
+        HttpEntity<String> request = new HttpEntity<>(headers);
+        
+        try {
+            ResponseEntity<String> response = restTemplate.exchange(url, org.springframework.http.HttpMethod.GET, request, String.class);
+            if (response.getStatusCode().is2xxSuccessful()) {
+                return response.getBody();
+            }
+        } catch (Exception e) {
+            System.err.println("Failed to fetch from IMS API (" + endpoint + "): " + e.getMessage());
+        }
+        return null;
+    }
+
+    public String getAttendance(String token) {
+        return fetchFromIms("/api/student/attendance", token);
+    }
+
+    public String getTimetable(String token) {
+        return fetchFromIms("/api/student/timetable", token);
+    }
+
+    public String getResults(String token, int semester) {
+        return fetchFromIms("/api/student/results?semester=" + semester, token);
+    }
+
+    public void logout(String token) {
+        String url = BASE_URL + "/api/auth/logout";
+        HttpHeaders headers = new HttpHeaders();
+        headers.setBearerAuth(token);
+        
+        HttpEntity<String> request = new HttpEntity<>(headers);
+        
+        try {
+            restTemplate.postForEntity(url, request, String.class);
+        } catch (Exception e) {
+            System.err.println("Failed to logout from IMS API: " + e.getMessage());
+        }
+    }
+}