Fix the creation of accounts in transaction service

currency-service/src/main/java/cz/muni/fi/obs/controller/CurrencyController.java

@@ -36,4 +36,10 @@ public class CurrencyController {
                                                         @RequestParam(defaultValue = "50") Integer pageSize) {
         return ResponseEntity.ok(currencyFacade.listPage(Pageable.ofSize(pageSize).withPage(page)));
     }
+
+    @Operation(summary = "Check if currency with code exists")
+    @GetMapping("/exists")
+    public boolean currencies(@RequestParam String code) {
+        return currencyFacade.codeExists(code);
+    }
 }

currency-service/src/main/java/cz/muni/fi/obs/data/repository/CurrencyRepository.java

@@ -10,4 +10,6 @@ import java.util.Optional;
 public interface CurrencyRepository extends JpaRepository<Currency, String> {
 
     Optional<Currency> findByCode(String code);
+
+    boolean existsByCode(String code);
 }

currency-service/src/main/java/cz/muni/fi/obs/facade/CurrencyFacade.java

@@ -39,4 +39,8 @@ public class CurrencyFacade {
                 .collect(Collectors.toList());
         return new PageImpl<>(dtos, pageRequest, currencies.getTotalElements());
     }
+
+    public boolean codeExists(String code) {
+        return currencyService.codeExists(code);
+    }
 }

currency-service/src/main/java/cz/muni/fi/obs/service/CurrencyService.java

@@ -22,4 +22,8 @@ public class CurrencyService {
     public Page<Currency> listPage(Pageable pageable) {
         return currencyRepository.findAll(pageable);
     }
+
+    public boolean codeExists(String code) {
+        return currencyRepository.existsByCode(code);
+    }
 }

transaction-service/src/main/java/cz/muni/fi/obs/controller/AccountController.java

@@ -48,7 +48,8 @@ public class AccountController {
 			description = "Creates an account for customer from request body",
 			responses = {
 					@ApiResponse(responseCode = "201", description = "Account created successfully"),
-					@ApiResponse(responseCode = "400", description = "Invalid request body")
+					@ApiResponse(responseCode = "400", description = "Invalid request body"),
+					@ApiResponse(responseCode = "404", description = "Currency not found")
 			}
 	)
 	@PostMapping(value = "/create", consumes = MediaType.APPLICATION_JSON_VALUE)

transaction-service/src/main/java/cz/muni/fi/obs/http/CurrencyServiceClient.java

@@ -3,6 +3,7 @@ package cz.muni.fi.obs.http;
 import java.util.Optional;
 
 import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 
 import cz.muni.fi.obs.api.CurrencyExchangeRequest;
@@ -21,6 +22,9 @@ public interface CurrencyServiceClient {
     @PostMapping("/v1/currencies/exchange")
     Optional<CurrencyExchangeResult> getCurrencyExchange(CurrencyExchangeRequest currencyExchangeRequest);
 
+    @GetMapping("/v1/currencies/exists")
+    boolean currencyExists(String currencyCode);
+
     @Slf4j
     class Fallback implements CurrencyServiceClient {
 
@@ -29,5 +33,11 @@ public interface CurrencyServiceClient {
             log.warn("Could not get currency exchange rate, returning null");
             return Optional.empty();
         }
+
+        @Override
+        public boolean currencyExists(String currencyCode) {
+            log.warn("Could not check if currency exists, returning false");
+            return false;
+        }
     }
 }

transaction-service/src/main/java/cz/muni/fi/obs/service/AccountService.java

@@ -3,6 +3,7 @@ package cz.muni.fi.obs.service;
 import java.util.List;
 import java.util.UUID;
 
+import cz.muni.fi.obs.http.CurrencyServiceClient;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -17,13 +18,20 @@ import cz.muni.fi.obs.exceptions.ResourceNotFoundException;
 public class AccountService {
 
 	private final AccountRepository repository;
+	private final CurrencyServiceClient client;
 
 	@Autowired
-	public AccountService(AccountRepository repository) {
+	public AccountService(AccountRepository repository, CurrencyServiceClient client) {
 		this.repository = repository;
-	}
+        this.client = client;
+    }
 
 	public AccountDbo createAccount(AccountCreateDto accountCreateDto) {
+
+		var exists = client.currencyExists(accountCreateDto.currencyCode());
+		if (!exists) {
+			throw new ResourceNotFoundException("Currency with code " + accountCreateDto.currencyCode() + " does not exist");
+		}
 		var accountDbo = AccountDbo.builder()
 				.id(UUID.randomUUID().toString())
 				.currencyCode(accountCreateDto.currencyCode())