feat: Implement add employee to project route (SCRUM-2) (!32)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: #32
Reviewed-by: Jan Gleytenhoover <krisellp9@gmail.com>
Co-authored-by: Phan Huy Tran <ptran@noreply.localhost>
Co-committed-by: Phan Huy Tran <ptran@noreply.localhost>

src/main/java/de/szut/lf8_starter/employee/EmployeeService.java

@@ -0,0 +1,34 @@
+package de.szut.lf8_starter.employee;
+
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.HttpClientErrorException;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class EmployeeService {
+    private final RestTemplate restTemplate;
+
+    public EmployeeService(RestTemplate restTemplate) {
+        this.restTemplate = restTemplate;
+    }
+
+    public boolean employeeExists(String accessToken, Long employeeId) {
+        HttpHeaders headers = new HttpHeaders();
+        headers.setBearerAuth(accessToken.replace("Bearer ", ""));
+
+        HttpEntity<String> requestEntity = new HttpEntity<>(headers);
+
+        String url = "https://employee.szut.dev/employees/" + employeeId;
+
+        try {
+            restTemplate.exchange(url, HttpMethod.GET, requestEntity, String.class);
+        } catch (HttpClientErrorException.NotFound e) {
+            return false;
+        }
+
+        return true;
+    }
+}

src/main/java/de/szut/lf8_starter/project/ProjectEntity.java

@@ -25,7 +25,7 @@ public class ProjectEntity {
 
     private long leadingEmployee;
 
-    @ElementCollection
+    @ElementCollection(fetch = FetchType.EAGER)
     private List<Long> employees;
 
     private long contractor;

src/main/java/de/szut/lf8_starter/project/ProjectService.java

@@ -25,10 +25,8 @@ public class ProjectService {
         return projectRepository.findById(id);
     }
 
-    public ProjectEntity update(ProjectEntity project) {
+    public void update(ProjectEntity project) {
         this.projectRepository.save(project);
-
-        return project;
     }
 
     public void delete(Long id) {

src/main/java/de/szut/lf8_starter/project/action/crud/CreateProjectAction.java

@@ -1,4 +1,4 @@
-package de.szut.lf8_starter.project.action;
+package de.szut.lf8_starter.project.action.crud;
 
 import de.szut.lf8_starter.project.ProjectEntity;
 import de.szut.lf8_starter.project.ProjectMapper;

src/main/java/de/szut/lf8_starter/project/action/crud/GetAllProjectsAction.java

@@ -1,4 +1,4 @@
-package de.szut.lf8_starter.project.action;
+package de.szut.lf8_starter.project.action.crud;
 
 import de.szut.lf8_starter.project.ProjectMapper;
 import de.szut.lf8_starter.project.ProjectService;

src/main/java/de/szut/lf8_starter/project/action/crud/GetProjectAction.java

@@ -1,4 +1,4 @@
-package de.szut.lf8_starter.project.action;
+package de.szut.lf8_starter.project.action.crud;
 
 import de.szut.lf8_starter.project.ProjectEntity;
 import de.szut.lf8_starter.project.ProjectMapper;
@@ -11,7 +11,10 @@ import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.*;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
 
 import java.util.Optional;
 

src/main/java/de/szut/lf8_starter/project/action/crud/UpdateProjectAction.java

@@ -1,4 +1,4 @@
-package de.szut.lf8_starter.project.action;
+package de.szut.lf8_starter.project.action.crud;
 
 import de.szut.lf8_starter.project.ProjectEntity;
 import de.szut.lf8_starter.project.ProjectMapper;

src/main/java/de/szut/lf8_starter/project/action/employee/AddEmployeeToProjectAction.java

@@ -0,0 +1,55 @@
+package de.szut.lf8_starter.project.action.employee;
+
+import de.szut.lf8_starter.employee.EmployeeService;
+import de.szut.lf8_starter.project.ProjectEntity;
+import de.szut.lf8_starter.project.ProjectService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Optional;
+
+@RestController
+public class AddEmployeeToProjectAction {
+    private final ProjectService projectService;
+    private final EmployeeService employeeService;
+
+    public AddEmployeeToProjectAction(ProjectService projectService, EmployeeService employeeService) {
+        this.projectService = projectService;
+        this.employeeService = employeeService;
+    }
+
+    @Operation(summary = "Add an employee to a project")
+    @ApiResponses(value = {
+            @ApiResponse(responseCode = "204", description = "Employee added to project"),
+            @ApiResponse(responseCode = "404", description = "Project or employee not found", content = @Content)
+    })
+    @PostMapping("/projects/{projectId}/employees/{employeeId}")
+    public ResponseEntity<Object> create(
+            @PathVariable Long projectId,
+            @PathVariable Long employeeId,
+            @RequestHeader("Authorization") String accessToken
+    ) {
+        Optional<ProjectEntity> project = this.projectService.findById(projectId);
+
+        if (project.isEmpty()) {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        if (!this.employeeService.employeeExists(accessToken, employeeId)) {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        project.get().getEmployees().add(employeeId);
+        this.projectService.update(project.get());
+
+        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+    }
+}

src/main/java/de/szut/lf8_starter/project/dto/EmployeeDto.java

@@ -0,0 +1,22 @@
+package de.szut.lf8_starter.project.dto;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.List;
+
+@Getter
+@Setter
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public class EmployeeDto {
+    private long id;
+    private String firstName;
+    private String lastName;
+    private String street;
+    private String postcode;
+    private String city;
+    private String phone;
+    private List<String> skillSet;
+}