added sendTeamInvite API method and all needed database tables

src/main/java/hhn/labsw/bugageocaching/controller/Controller.java

@@ -49,6 +49,9 @@ public class Controller {
   @Autowired
   User_InfoRepository user_infoRepository;
 
+  @Autowired
+  TeamInviteRepository teamInviteRepository;
+
   @PostConstruct
   public void init() {
     fetchPublicKey();
@@ -626,6 +629,71 @@ public class Controller {
     return ResponseEntity.status(200).body("Ok");
   }
 
+
+  @CrossOrigin(origins = "http://localhost:8081") // only for dev purpose
+  @RequestMapping("/api/sendTeamInvite")
+  @ResponseBody
+  public ResponseEntity sendTeamInvite(@RequestParam String token,
+                                       @RequestParam String invitedUserEmail) {
+    // verify user
+    ResponseEntity verifyToken = VerificationUtil.verifyToken(token);
+
+    if (verifyToken.getStatusCodeValue() != 200) {
+      return verifyToken;
+    }
+
+    //get User
+    Claims claims = (Claims) verifyToken.getBody();
+
+    ResponseEntity getUser = FinderUtil.findUserFromClaim(claims);
+
+    if (getUser.getStatusCodeValue() != 200) {
+      return getUser;
+    }
+
+    User user = (User) getUser.getBody();
+
+    // get InvitedUser
+
+    User invitedUser = userRepository.findByEmail(invitedUserEmail);
+
+    if (invitedUser == null) {
+      return ResponseEntity.status(404).body("There isnt any user with that email");
+    }
+    //----------------------
+
+
+    //Get User_Info
+    ResponseEntity getUser_Info = FinderUtil.findUser_InfoByID(String.valueOf(user.getId()));
+
+    if (getUser_Info.getStatusCodeValue() != 200) {
+      return getUser_Info;
+    }
+
+    User_Info user_info = (User_Info) getUser_Info.getBody();
+    //----------------------
+    if (user_info.getTeam() == null) {
+      return ResponseEntity.status(400).body("You aren´t in any team");
+    }
+
+    //Get team
+    ResponseEntity getTeam = FinderUtil.findTeamById(String.valueOf(user_info.getTeam().getId()));
+
+    if (getTeam.getStatusCodeValue() != 200) {
+      return getTeam;
+    }
+
+    Team team = (Team) getTeam.getBody();
+
+    TeamInvite teamInvite = new TeamInvite();
+    teamInvite.setUser(invitedUser);
+    teamInvite.setTeam(team);
+
+    teamInviteRepository.save(teamInvite);
+
+    return ResponseEntity.status(200).body("OK");
+  }
+
   @RequestMapping("/api/hello")
   public ResponseEntity hello(@RequestParam String name) {
     return ResponseEntity.status(200).body(userRepository.getRankingPlaceFromUser(name));

src/main/java/hhn/labsw/bugageocaching/entities/TeamInvite.java

@@ -0,0 +1,42 @@
+package hhn.labsw.bugageocaching.entities;
+
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.OneToOne;
+
+public class TeamInvite {
+
+  @Id
+  @GeneratedValue
+  private int id;
+
+  @OneToOne
+  private User user;
+
+  @OneToOne
+  private Team team;
+
+  public int getId() {
+    return id;
+  }
+
+  public void setId(int id) {
+    this.id = id;
+  }
+
+  public User getUser() {
+    return user;
+  }
+
+  public void setUser(User user) {
+    this.user = user;
+  }
+
+  public Team getTeam() {
+    return team;
+  }
+
+  public void setTeam(Team team) {
+    this.team = team;
+  }
+}

src/main/java/hhn/labsw/bugageocaching/repositories/TeamInviteRepository.java

@@ -0,0 +1,9 @@
+package hhn.labsw.bugageocaching.repositories;
+
+import hhn.labsw.bugageocaching.entities.Cache;
+import hhn.labsw.bugageocaching.entities.TeamInvite;
+import hhn.labsw.bugageocaching.entities.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface TeamInviteRepository extends JpaRepository<TeamInvite, Integer> {
+}

src/main/java/hhn/labsw/bugageocaching/repositories/UserRepository.java

@@ -7,7 +7,7 @@ import org.springframework.data.repository.CrudRepository;
 import java.util.List;
 
 public interface UserRepository extends CrudRepository<User, Integer> {
-  User findByUsername(String username);
+  User findByEmail(String email);
 
   @Query(value = "SELECT DISTINCT u.id AS ID, SUBSTRING_INDEX(u.email, '@', 1) AS Name, ui.ranking_points_sum AS Ranglistenpunkte\n" +
       "FROM user u,\n" +