Implementação do endpoint /accounts/balance.

Desenvolvimento do endpoint /accounts/balance que retorna o valor em conta bancária para o usuário autenticado e suas demais validações.

src/main/java/br/com/maida/desafio/bankapi/controller/AccountController.java

@@ -6,6 +6,8 @@
 package br.com.maida.desafio.bankapi.controller;
 
 import br.com.maida.desafio.bankapi.model.Account;
+import br.com.maida.desafio.bankapi.model.AccountBalance;
+import br.com.maida.desafio.bankapi.model.AccountBalanceResponse;
 import br.com.maida.desafio.bankapi.model.AccountResponse;
 import br.com.maida.desafio.bankapi.model.AccountTransfer;
 import br.com.maida.desafio.bankapi.model.AccountTransferResponse;
@@ -144,4 +146,31 @@ public ResponseEntity<Object> transfer(@Valid @RequestBody AccountTransfer jsonA
 
     }
 
+    @PostMapping(path = "/balance", produces = {"application/json"})
+    @ResponseBody
+    public ResponseEntity<Object> balance(@Valid @RequestBody AccountBalance jsonAccountBalanceString) {
+
+        if (accountService.validateNumberExists(jsonAccountBalanceString.getAccount_number())) {
+            if (accountService.validateAccountEmail(jsonAccountBalanceString.getAccount_number(),
+                    SecurityContextHolder.getContext().getAuthentication().getName())) {
+
+                Account balanceAccount = accountService.getAccountByNumber(jsonAccountBalanceString.getAccount_number());
+
+                return ResponseEntity.status(HttpStatus.OK).body(new AccountBalanceResponse(balanceAccount.getNumber(), balanceAccount.getBalance()));
+
+            } else {
+                return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body(
+                        new JSONObject()
+                                .put("erro", "Conta não encontrada para o usuário informado")
+                                .toString());
+            }
+        } else {
+            return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body(
+                    new JSONObject()
+                            .put("erro", "Conta não encontrada para o usuário informado")
+                            .toString());
+        }
+
+    }
+
 }

src/main/java/br/com/maida/desafio/bankapi/model/AccountBalance.java

@@ -0,0 +1,37 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.com.maida.desafio.bankapi.model;
+
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+
+/**
+ *
+ * @author Gabriel Duarte
+ */
+public class AccountBalance {
+
+    @NotNull(message = "Campo account_number ausente.")
+    @NotEmpty(message = "Campo account_number vazio.")
+    private String account_number;
+
+    public AccountBalance() {
+
+    }
+
+    public AccountBalance(String account_number) {
+        this.account_number = account_number;
+    }
+
+    public String getAccount_number() {
+        return account_number;
+    }
+
+    public void setAccount_number(String account_number) {
+        this.account_number = account_number;
+    }
+
+}

src/main/java/br/com/maida/desafio/bankapi/model/AccountBalanceResponse.java

@@ -0,0 +1,32 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.com.maida.desafio.bankapi.model;
+
+import java.math.BigDecimal;
+
+/**
+ *
+ * @author Gabriel Duarte
+ */
+public class AccountBalanceResponse {
+
+    private String account_number;
+    private BigDecimal balance;
+
+    public AccountBalanceResponse(String account_number, BigDecimal balance) {
+        this.account_number = account_number;
+        this.balance = balance;
+    }
+
+    public String getAccount_number() {
+        return account_number;
+    }
+
+    public BigDecimal getBalance() {
+        return balance;
+    }
+
+}