feat: add REST exercise

REST/.gitignore

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+/target/
+.project
+.settings
+.classpath

REST/Makefile

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+
+run:
+	mvn spring-boot:run

REST/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>
+  <groupId>me.srvstr.rest</groupId>
+  <artifactId>rest</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <name>rmi</name>
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.release>17</maven.compiler.release>
+  </properties>
+  <dependencyManagement>
+    <dependencies>
+    </dependencies>
+  </dependencyManagement>
+  <dependencies>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot</artifactId>
+      <version>3.4.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+      <version>3.4.0</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.11.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.springdoc</groupId>
+      <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
+      <version>2.2.0</version>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+        <plugin>
+          <groupId>org.springframework.boot</groupId>
+          <artifactId>spring-boot-maven-plugin</artifactId>
+          <configuration>
+              <mainClass>me.srvstr.rest.Main</mainClass>
+          </configuration>
+        </plugin>
+    </plugins>
+  </build>
+</project>

REST/src/main/java/me/srvstr/rest/Controller.java

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+package me.srvstr.rest;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+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.RestController;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
+
+import me.srvstr.rest.model.Student;
+
+@RestController
+public class Controller {
+
+  private static Map<Integer, Student> students = new HashMap<Integer, Student>();
+
+  @GetMapping("/api/v0/hello-world")
+  public String HelloWorld() {
+    return "Hello, World!";
+  }
+
+  @GetMapping("/api/v0/student")
+  public String getSomeStudent() {
+    return new Gson().toJson(new Student(1, "Klaus Peter", 123456));
+  }
+
+  @GetMapping("/api/v1/students")
+  public String getStudents() {
+    return new Gson().toJson(students);
+  }
+
+  @PostMapping("/api/v1/student")
+  public ResponseEntity<String> createStudent(@RequestBody String body) {
+
+    try {
+
+      Student student = new Gson().fromJson(body, Student.class);
+
+      students.put(student.getId(), student);
+
+    } catch (JsonSyntaxException e) {
+      return new ResponseEntity<String>(e.getMessage(), HttpStatus.BAD_REQUEST);
+    }
+
+    return ResponseEntity.ok("Student created.");
+  }
+
+  @GetMapping("/api/v1/student/{id}")
+  public ResponseEntity<String> getStudent(@PathVariable(name = "id") String id) {
+    Student student = students.get(Integer.parseInt(id));
+
+    if (null == student) {
+      return new ResponseEntity<String>("Student not found", HttpStatus.NOT_FOUND);
+    } else {
+      return ResponseEntity.ok(new Gson().toJson(student));
+    }
+  }
+}

REST/src/main/java/me/srvstr/rest/Main.java

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+package me.srvstr.rest;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Main {
+
+  public static void main(String[] args) {
+    SpringApplication.run(Main.class, args);
+  }
+}

REST/src/main/java/me/srvstr/rest/model/Student.java

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+package me.srvstr.rest.model;
+
+import java.util.Date;
+
+public class Student {
+
+  private int id;
+  private int matriculationNumber;
+  private String name;
+
+  // Set to current time.
+  private final Date creationDate = new Date();
+
+  public Student(int id, String name, int matriculationNumber) {
+    this.id = id;
+    this.name = name;
+    this.matriculationNumber = matriculationNumber;
+  }
+
+  public int getId() {
+    return id;
+  }
+
+  public int getMatriculationNumber() {
+    return matriculationNumber;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public Date getCreationDate() {
+    return creationDate;
+  }
+}

REST/verteilte-systeme-rest/Create Student.bru

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+meta {
+  name: Create Student
+  type: http
+  seq: 5
+}
+
+post {
+  url: http://localhost:8080/api/v1/student
+  body: json
+  auth: none
+}
+
+body:json {
+  {
+    "id": 1,
+    "name": "Peter Maier",
+    "matriculationNumber": 123456
+  }
+}

REST/verteilte-systeme-rest/Get Student.bru

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+meta {
+  name: Get Student
+  type: http
+  seq: 6
+}
+
+get {
+  url: http://localhost:8080/api/v1/student/1
+  body: none
+  auth: none
+}

REST/verteilte-systeme-rest/Hello World.bru

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+meta {
+  name: Hello World
+  type: http
+  seq: 2
+}
+
+get {
+  url: api/v0/hello-world
+  body: none
+  auth: none
+}

REST/verteilte-systeme-rest/Student.bru

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+meta {
+  name: Student
+  type: http
+  seq: 3
+}
+
+get {
+  url: http://localhost:8080/api/v0/student
+  body: none
+  auth: none
+}

REST/verteilte-systeme-rest/Students.bru

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+meta {
+  name: Students
+  type: http
+  seq: 4
+}
+
+get {
+  url: http://localhost:8080/api/v1/students
+  body: none
+  auth: none
+}

REST/verteilte-systeme-rest/bruno.json

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+{
+  "version": "1",
+  "name": "verteilte-systeme-rest",
+  "type": "collection",
+  "ignore": [
+    "node_modules",
+    ".git"
+  ]
+}

REST/verteilte-systeme-rest/environments/Local.bru

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+vars {
+}