first implementation for checkStation(API method for cache durchführen)

src/main/java/hhn/labsw/bugageocaching/controller/Controller.java

@@ -164,6 +164,81 @@ public class Controller {
     }
   }
 
+  @CrossOrigin(origins = "http://localhost:8081") // only for dev purpose
+  @RequestMapping("/api/checkStation")
+  @ResponseBody
+  public ResponseEntity checkStation(@RequestParam String token,
+                                     @RequestParam String cacheID,
+                                     @RequestParam String stationID,
+                                     @RequestParam String durchgefuehrterCacheID) {
+    try {
+      Claims claims = Jwts.parser() //Parse JWT
+          .setSigningKey(key)
+          .parseClaimsJws(token).getBody();
+
+      User user = userRepository.findByUsername(claims.getSubject());
+      if (user == null) {
+        return ResponseEntity.status(404).body("User was not found");
+      }
+
+      Optional<Cache> cacheOptional = cacheRepository.findById(Integer.valueOf(cacheID));
+      Cache cache;
+      if (cacheOptional.isPresent()) {
+        cache = cacheOptional.get();
+      } else {
+        return ResponseEntity.status(404).body("Couldnt find Cache " + cacheID);
+      }
+
+      Optional<Cache> durchgefuehrterCacheIDOptional = cacheRepository.findById(Integer.valueOf(durchgefuehrterCacheID));
+      Cache durchgefuehrterCache;
+      if (durchgefuehrterCacheIDOptional.isPresent()) {
+        durchgefuehrterCache = cacheOptional.get();
+      } else {
+        return ResponseEntity.status(404).body("Couldnt find Cache " + durchgefuehrterCacheID);
+      }
+
+      Optional<Station> stationOptional = stationRepository.findById(Integer.valueOf(stationID));
+      Station station;
+      if (stationOptional.isPresent()) {
+        station = stationOptional.get();
+      } else {
+        return ResponseEntity.status(404).body("Couldnt find Station " + stationID);
+      }
+
+      if (cache != durchgefuehrterCache) {
+        return ResponseEntity.status(400).body("The scanned station isn´t the correct following station");
+      }
+
+      Bearbeitet bearbeitet;
+      if (bearbeitetRepository.findByUserAndCache(user, cache) != null) {
+        bearbeitet = bearbeitetRepository.findByUserAndCache(user, cache);
+      } else {
+        return ResponseEntity.status(400).body("The user has not started this cache yet");
+      }
+
+      Station aktuelleStation = bearbeitet.getAktuelleStation();
+
+      int i = 0;
+      for (Station station1 : cache.getStationen()) {
+        if (station1.equals(station)) {
+          break;
+        }
+        i++;
+      }
+
+      if (cache.getStationen().get(i - 1).equals(aktuelleStation)) {
+        return ResponseEntity.status(200).body("OK");
+      } else {
+        return ResponseEntity.status(400).body("The scanned station isn´t the correct following station");
+      }
+
+    } catch (ExpiredJwtException e) {
+      return ResponseEntity.status(400).body("JWT Token expired");
+    } catch (Exception e) {
+      return ResponseEntity.status(400).body("JWT Token invalid");
+    }
+  }
+
   @CrossOrigin(origins = "http://localhost:8081") // only for dev purpose
   @RequestMapping("/api/createCache")
   @ResponseBody