Merge pull request #3 from JSCODE-EDU/HiiWee/day4

[이호석] DAY4 Controller, Service, Repository 구분하기(완료)

spring/.gitignore

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+## api key
+exchanges.yml

spring/src/main/java/com/jscode/spring/advice/BadRequestException.java

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+package com.jscode.spring.advice;
+
+public class BadRequestException extends BusinessException {
+
+    public BadRequestException(final String message) {
+        super(message);
+    }
+
+}

spring/src/main/java/com/jscode/spring/advice/BusinessException.java

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+package com.jscode.spring.advice;
+
+public class BusinessException extends RuntimeException {
+
+    public BusinessException(final String message) {
+        super(message);
+    }
+
+}

spring/src/main/java/com/jscode/spring/advice/ControllerAdvice.java

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+package com.jscode.spring.advice;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+/**
+ * (미션 3 ) 조회/등록 실패할 때 응답 interface 구현
+ */
+@RestControllerAdvice
+public class ControllerAdvice {
+
+    @ExceptionHandler(NotFoundException.class)
+    ResponseEntity<ErrorResponse> handleNotFoundException(NotFoundException e) {
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(new ErrorResponse(e.getMessage()));
+    }
+
+    @ExceptionHandler(BadRequestException.class)
+    ResponseEntity<ErrorResponse> handleBadRequestException(BadRequestException e) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new ErrorResponse(e.getMessage()));
+    }
+
+}

spring/src/main/java/com/jscode/spring/advice/ErrorResponse.java

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+package com.jscode.spring.advice;
+
+import lombok.Getter;
+
+@Getter
+public class ErrorResponse {
+
+    private String message;
+
+    public ErrorResponse(final String message) {
+        this.message = message;
+    }
+
+}

spring/src/main/java/com/jscode/spring/advice/NotFoundException.java

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+package com.jscode.spring.advice;
+
+public class NotFoundException extends BusinessException {
+
+    public NotFoundException(final String message) {
+        super(message);
+    }
+
+}

spring/src/main/java/com/jscode/spring/exchange/config/ExchangeYamlRead.java

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+package com.jscode.spring.exchange.config;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@PropertySource(value = "classpath:exchanges.yml", factory = YamlPropertySourceFactory.class)
+@ConfigurationProperties(prefix = "apilayer")
+@Getter
+@Setter
+public class ExchangeYamlRead {
+
+    private String key;
+
+}

spring/src/main/java/com/jscode/spring/exchange/config/YamlPropertySourceFactory.java

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+package com.jscode.spring.exchange.config;
+
+import java.util.Properties;
+import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
+import org.springframework.core.env.PropertiesPropertySource;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.support.EncodedResource;
+import org.springframework.core.io.support.PropertySourceFactory;
+
+public class YamlPropertySourceFactory implements PropertySourceFactory {
+
+    @Override
+    public PropertySource<?> createPropertySource(final String name, final EncodedResource resource) {
+        YamlPropertiesFactoryBean factoryBean = new YamlPropertiesFactoryBean();
+        factoryBean.setResources(resource.getResource());
+        factoryBean.afterPropertiesSet();
+        Properties properties = factoryBean.getObject();
+        if (name != null) {
+            return new PropertiesPropertySource(name, properties);
+        }
+        return new PropertiesPropertySource(resource.getResource().getFilename(), properties);
+    }
+
+}

spring/src/main/java/com/jscode/spring/exchange/domain/ExchangeRates.java

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+package com.jscode.spring.exchange.domain;
+
+import java.time.LocalDate;
+import java.util.Map;
+import lombok.Getter;
+
+@Getter
+public class ExchangeRates {
+
+    private String base;
+    private LocalDate date;
+    private Map<String, Double> rates;
+
+    public ExchangeRates() {
+    }
+
+    public double findRates(final String countryName) {
+        return rates.get(countryName);
+    }
+
+}

spring/src/main/java/com/jscode/spring/exchange/service/ExchangeRatesService.java

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+package com.jscode.spring.exchange.service;
+
+import com.jscode.spring.exchange.config.ExchangeYamlRead;
+import com.jscode.spring.exchange.domain.ExchangeRates;
+import com.jscode.spring.product.domain.MonetaryUnit;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class ExchangeRatesService {
+
+    public static final String EXCHANGE_URL = "https://api.apilayer.com/exchangerates_data/latest?symbols=KRW&base=%s";
+
+    private final ExchangeYamlRead exchangeYamlRead;
+
+    public ExchangeRatesService(final ExchangeYamlRead exchangeYamlRead) {
+        this.exchangeYamlRead = exchangeYamlRead;
+    }
+
+    public double convertKrwTo(final MonetaryUnit monetaryUnit, final int value) {
+        RestTemplate template = new RestTemplate();
+        ResponseEntity<ExchangeRates> exchange = template.exchange(
+                String.format(EXCHANGE_URL, monetaryUnit.toString()),
+                HttpMethod.GET,
+                new HttpEntity<>(generateHeader("apikey")),
+                ExchangeRates.class
+        );
+        return value / exchange.getBody()
+                .findRates("KRW");
+    }
+
+    private HttpHeaders generateHeader(final String header) {
+        HttpHeaders httpHeaders = new HttpHeaders();
+        httpHeaders.set(header, exchangeYamlRead.getKey());
+        return httpHeaders;
+    }
+
+}

spring/src/main/java/com/jscode/spring/product/controller/ProductController.java

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+package com.jscode.spring.product.controller;
+
+import com.jscode.spring.product.dto.NewProductRequest;
+import com.jscode.spring.product.dto.ProductListResponse;
+import com.jscode.spring.product.dto.ProductResponse;
+import com.jscode.spring.product.dto.ProductSaveResponse;
+import com.jscode.spring.product.service.ProductService;
+import java.util.Objects;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.lang.Nullable;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@Slf4j
+@RestController
+@RequestMapping("/api")
+public class ProductController {
+
+    private final ProductService productService;
+
+    public ProductController(final ProductService productService) {
+        this.productService = productService;
+    }
+
+    /**
+     * (연습문제 1 ) 상품 등록 api <br>
+     * (미션 1 ) 상품 등록 api (동일상품 등록시 실패)
+     */
+    @PostMapping("/products")
+    public ProductSaveResponse saveProduct(@RequestBody final NewProductRequest newProductRequest) {
+        Long generatedId = productService.saveProduct(newProductRequest);
+        return new ProductSaveResponse(generatedId);
+    }
+
+    /**
+     * (연습문제 2 ) 상품 조회 api
+     */
+    @GetMapping("/products/{productId}")
+    public ProductResponse findProductById(@PathVariable final Long productId,
+                                           @RequestParam @Nullable final String monetaryUnit) {
+        return productService.findProductById(productId, monetaryUnit);
+    }
+
+    /**
+     * (연습문제 3 ) 전체 상품 조회 (미션) 상품 이름으로 상세조회하는 api <br>
+     * (미션 2 ) 상품 상세 조회 api
+     */
+    @GetMapping("/products")
+    public ProductListResponse findProducts(@RequestParam @Nullable final String name,
+                                            @RequestParam @Nullable final String monetaryUnit) {
+        if (Objects.isNull(name)) {
+            return productService.findAll(monetaryUnit);
+        }
+        return productService.findAllByName(name, monetaryUnit);
+    }
+
+}

spring/src/main/java/com/jscode/spring/product/domain/MonetaryUnit.java

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+package com.jscode.spring.product.domain;
+
+public enum MonetaryUnit {
+    USD, KRW
+}

spring/src/main/java/com/jscode/spring/product/domain/Product.java

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+package com.jscode.spring.product.domain;
+
+import java.util.Objects;
+import lombok.Getter;
+
+@Getter
+public class Product {
+
+    private Long id;
+    private String name;
+    private int price;
+
+    public Product(final Long id, final String name, final int price) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+    }
+
+    public void generateId(final Long id) {
+        this.id = id;
+    }
+
+    public boolean isSameId(final Long id) {
+        return Objects.equals(this.id, id);
+    }
+
+    public boolean isSameName(final String name) {
+        return this.name.equals(name);
+    }
+}

spring/src/main/java/com/jscode/spring/product/dto/NewProductRequest.java

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+package com.jscode.spring.product.dto;
+
+import com.jscode.spring.product.domain.Product;
+import lombok.Getter;
+
+@Getter
+public class NewProductRequest {
+
+    private String name;
+    private int price;
+
+    private NewProductRequest() {
+    }
+
+    public NewProductRequest(final String name, final int price) {
+        this.name = name;
+        this.price = price;
+    }
+
+    public Product toDomain() {
+        return new Product(null, name, price);
+    }
+
+}

spring/src/main/java/com/jscode/spring/product/dto/ProductListResponse.java

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+package com.jscode.spring.product.dto;
+
+import java.util.List;
+import lombok.Getter;
+
+@Getter
+public class ProductListResponse {
+
+    private List<ProductResponse> productResponses;
+
+    public ProductListResponse(final List<ProductResponse> productResponses) {
+        this.productResponses = productResponses;
+    }
+
+    public boolean contains(final ProductResponse productResponse) {
+        return productResponses.contains(productResponse);
+    }
+
+}

spring/src/main/java/com/jscode/spring/product/dto/ProductResponse.java

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+package com.jscode.spring.product.dto;
+
+import com.jscode.spring.product.domain.Product;
+import java.util.Objects;
+import lombok.Getter;
+
+@Getter
+public class ProductResponse {
+
+    private Long id;
+    private String name;
+    private double price;
+
+    private ProductResponse(final Long id, final String name, final double price) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+    }
+
+    public static ProductResponse of(final Product product, final double price) {
+        return new ProductResponse(product.getId(), product.getName(), price);
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        ProductResponse that = (ProductResponse) o;
+        return Double.compare(that.price, price) == 0 && id.equals(that.id) && name.equals(that.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name, price);
+    }
+
+}

spring/src/main/java/com/jscode/spring/product/dto/ProductSaveResponse.java

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+package com.jscode.spring.product.dto;
+
+import lombok.Getter;
+
+@Getter
+public class ProductSaveResponse {
+
+    private Long savedId;
+
+    public ProductSaveResponse(final Long savedId) {
+        this.savedId = savedId;
+    }
+
+}

spring/src/main/java/com/jscode/spring/product/exception/DuplicateNameException.java

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+package com.jscode.spring.product.exception;
+
+import com.jscode.spring.advice.BadRequestException;
+
+public class DuplicateNameException extends BadRequestException {
+
+    private static final String MESSAGE = "동일한 이름의 상품은 저장할 수 없습니다.";
+
+    public DuplicateNameException() {
+        super(MESSAGE);
+    }
+
+}