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Documentation.md

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+# rent-information-service
+
+## Authentication
+One user is available.
+
+**Username**: `rokas`
+
+**Password**: `rokas1`
+
+## API calls
+### List products
+Fetches products available to rent.
+
+* **URL**
+
+  /api/v1/products
+
+* **Method**
+
+  `GET`
+
+* **URL Params**
+
+  N/A
+
+* **Data Params**
+
+  N/A
+
+* **Success Response**
+
+  * **Code**: 200 OK
+  * **Content**: `[{"id":1,"title":"Skis"},{"id":2,"title":"Snowboard"},...]`
+
+
+* **Error Response**
+
+  * **Code**: 401 UNAUTHORIZED
+
+
+* **Sample Call**
+
+   ```
+   curl --location --request GET 'http://localhost:8080/api/v1/products' \
+   --header 'Authorization: Basic cm9rYXM6cm9rYXMx' \
+   --header 'Cookie: JSESSIONID=748E420446F0264E69924105E66B699E'
+   ```
+
+
+### Show product details
+Fetches individual product details.
+
+* **URL**
+
+  /api/v1/details
+
+* **Method**
+
+  `GET`
+
+* **URL Params**
+
+  **Required**:
+
+  ``id=[integer]``
+
+* **Data Params**
+
+  N/A
+
+* **Success Response**
+
+  * **Code**: 200 OK
+  * **Content**: `{"id":1,"title":"Skis","commitmentMonths":[0,3,6]}`
+
+
+* **Error Response**
+
+  * **Code**: 400 BAD_REQUEST
+
+  * **Code**: 401 UNAUTHORIZED
+
+  * **Code**: 404 NOT_FOUND
+
+
+* **Sample Call**
+
+   ```
+   curl --location --request GET 'http://localhost:8080/api/v1/details?id=1' \
+   --header 'Authorization: Basic cm9rYXM6cm9rYXMx' \
+   --header 'Cookie: JSESSIONID=748E420446F0264E69924105E66B699E'
+   ```
+
+
+### Delete product
+Deletes a product.
+
+* **URL**
+
+  /api/v1/delete
+
+* **Method**
+
+  `GET`
+
+* **URL Params**
+
+  **Required**:
+
+  ``id=[integer]``
+
+* **Data Params**
+
+  N/A
+
+* **Success Response**
+
+  * **Code**: 200 OK
+
+
+* **Error Response**
+
+  * **Code**: 400 BAD_REQUEST
+
+  * **Code**: 401 UNAUTHORIZED
+
+  * **Code**: 404 NOT_FOUND
+
+
+* **Sample Call**
+
+   ```
+   curl --location --request GET 'http://localhost:8080/api/v1/delete?id=1' \
+  --header 'Authorization: Basic cm9rYXM6cm9rYXMx' \
+  --header 'Cookie: JSESSIONID=A3E8A8255D27A1501BAF8BBCA9157DEA'
+   ```
+
+
+### Calculate order price
+Fetches order price depending on product, commitment, months of return.
+
+* **URL**
+
+  /api/v1/price
+
+* **Method**
+
+  `POST`
+
+* **URL Params**
+
+  N/A
+
+* **Data Params**
+
+  JSON format.
+
+  **Required**:
+
+  `"id":[integer]`
+
+  **Optional**:
+
+  `"commitment":[integer]`. Must be one of {3, 6}.
+
+  `"returnMonths":[integer]`. Must be greater than or equal to 0.
+
+* **Success Response**
+
+  * **Code**: 200 OK
+  * **Content**: `70.0`
+
+
+* **Error Response**
+
+  * **Code**: 400 BAD_REQUEST
+
+  * **Code**: 401 UNAUTHORIZED
+
+  * **Code**: 404 NOT_FOUND
+
+
+* **Sample Call**
+
+   ```
+   curl --location --request POST 'http://localhost:8080/api/v1/price' \
+  --header 'Authorization: Basic cm9rYXM6cm9rYXMx' \
+  --header 'Content-Type: application/json' \
+  --header 'Cookie: JSESSIONID=748E420446F0264E69924105E66B699E' \
+  --data-raw '{"id":1,"commitment":3,"returnMonths":1}'
+   ```

README.md

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+# Rental Store Mock API
+REST API made with Spring Boot (web, JPA, validation, cache, security), H2 database, Flyway migration, Docker, JUnit and Mockito tests, Lombok. Built on Java 11.
+
+## Use cases
+* API users can get a list of available equipment.
+* API users can choose a single product and get its details and pricing options.
+* API users can delete a product.
+* API users can calculate the total price for the chosen product, commitment and rental period.
+
+Each use case corresponds to an endpoint. Technical details and specifications of each can be found in the Documentation.md file.
+
+## Features
+
+* REST API endpoints for each use case mentioned above.
+* Spring Boot Validation for these endpoints.
+* Error codes for invalid, unauthorized or incorrect data.
+* Persistent H2 database.
+* Flyway database migrations for setting up and filling database tables.
+* Basic Spring Security with a single user.
+* Basic Spring Caching for data retrieval and cache eviction upon product deletion.
+* Docker script for running the generated JAR file.
+* JUnit unit tests for price calculations mentioned below. Mockito for mocking the database for these tests.
+
+## Sample data
+
+| Product | Price/month without commitment| Price/month for 3 month commitment | Price/month for 6 month commitment | Initial charge | Available for rent
+|---:|---:|---:|---:|---:|---
+|Skis|$35|$30|$25|$35|Yes
+|Snowboard|$25|$20|$17|$25|Yes
+|Bike|$35|$30|$25|$35|No
+|Roller-blades|$17|$13|$10|$17|Yes
+|Skateboard|$35|$30|$25|$35|Yes
+
+## Pricing formula
+
+Commitment is a number of months that the customer chooses to rent the equipment for. It can either be 3, 6 months or no commitment. Regardless of commitment, a customer can choose to return the product at a different time in which case they would pay no commitment price.
+
+Pricing formula is as follows:
+
+*total price = initial charge + (return months * price per month, based on commitment)*
+
+For example:
+* User chooses a skateboard with a commitment of 6 months and chooses to return it after 2 months: 
+    * price = $35 initial charge + (2 months * $35 no commitment price) = $105
+
+
+* User chooses roller-blades without a commitment and chooses to return it after 7 months:
+    * price = $17 initial charge + (7 months * $17 no commitment price) = $136

dockerfile

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+FROM openjdk:11-jdk-slim
+ARG JAR_FILE=target/*.jar
+COPY ${JAR_FILE} app.jar
+ENTRYPOINT ["java","-jar","/app.jar"]

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.3.1.RELEASE</version>
+		<relativePath/>
+	</parent>
+	<groupId>dev.rokas.task.backend</groupId>
+	<artifactId>rent-information-service</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>rent-information-service</name>
+	<description>Boilerplate for backend application</description>
+	<properties>
+		<java.version>11</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-actuator</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-cache</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-rest</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-security</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.security</groupId>
+			<artifactId>spring-security-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.flywaydb</groupId>
+			<artifactId>flyway-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+			<scope>provided</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.security</groupId>
+			<artifactId>spring-security-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-all</artifactId>
+			<version>1.9.5</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/dev/rokas/task/backend/RentInformationApplication.java

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+package dev.rokas.task.backend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
+
+@EnableCaching
+@SpringBootApplication
+public class RentInformationApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(RentInformationApplication.class, args);
+	}
+
+}

src/main/java/dev/rokas/task/backend/api/v1/auth/SecurityConfig.java

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+package dev.rokas.task.backend.api.v1.auth;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+@Configuration
+public class SecurityConfig extends WebSecurityConfigurerAdapter {
+
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        http
+                .csrf().disable()
+                .authorizeRequests().anyRequest().authenticated()
+                .and().headers().frameOptions().disable()
+                .and().httpBasic();
+    }
+
+    @Autowired
+    public void configureGlobal(AuthenticationManagerBuilder authenticationManagerBuilder) throws Exception {
+        authenticationManagerBuilder
+                .inMemoryAuthentication()
+                .withUser("rokas")
+                .password(getPasswordEncoder().encode("rokas1"))
+                .authorities("user");
+    }
+
+    @Bean
+    public PasswordEncoder getPasswordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+
+}